JPH1127943A - Power supply - Google Patents

Abstract

(57) [Summary] The present invention provides a power supply device capable of accommodating AC power supplies of different voltages and capable of taking measures to suppress harmonics. SOLUTION: A choke coil 2 having windings 2a and 2b to which an AC voltage from an AC power supply 1 is input, and a diode for rectifying and smoothing the AC voltage passing through the choke coil 2 to supply a DC voltage to a load R. A power supply device having a rectifying / smoothing circuit 3 using D1 to D4 and capacitors C1 and C2, wherein the windings 2a and 2b of the choke coil 2 are connected in parallel when a first AC voltage is applied. When the second AC voltage is higher than the voltage, a switch S2 for switching to a series connection, and diodes D1 to D4 are connected to the first AC voltage in accordance with the switching of the windings 2a and 2b by the switch S2. A changeover switch S1 is provided to switch between the rectification and the rectification of the second AC voltage so that a similar rectification method is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching power supply, and more particularly, to a switching power supply capable of coping with a plurality of input voltages having different voltage values and realizing harmonic suppression.

[0002]

2. Description of the Related Art Conventionally, when a load such as an electronic device is connected to each AC power supply for supplying a different voltage via a power supply device and a predetermined DC power is to be supplied to this load, a simple operation is required. A single power supply device cannot cope with different voltages, and a plurality of power supply devices having corresponding circuit configurations must be prepared according to the difference in the voltage value of the AC power supply.

[0003]

As described above, in the prior art, a plurality of power supplies must be prepared according to the difference in the voltage value of the AC power supply. Increased cost burden.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a single configuration and different heights (for example, 200
V, 100V, etc.), which can cope with each AC power supply that supplies a voltage, avoiding an increase in cost, and taking measures to suppress harmonics generated when a high voltage (for example, 200V) is input. It is intended to provide.

[0005]

According to a first aspect of the present invention, there is provided a power supply device having a transformer having two windings to which an AC voltage from an AC power supply is input, and rectifying and smoothing the AC voltage passing through the transformer. And a rectifying / smoothing circuit using a plurality of rectifying elements and a capacitive element for supplying a DC voltage to a load, wherein two windings of the transformation element are connected in parallel when the first AC voltage is applied. In connection, when the second AC voltage is higher than the first AC voltage, the winding connection switching means switches to series connection when the second AC voltage is higher than the first AC voltage, and the connection switching between the two windings of the transformer is performed by the winding connection switching means. Rectifying element switching means for switching and connecting a plurality of rectifying elements of the rectifying / smoothing circuit so as to have a similar rectifying method by rectifying a first AC voltage and rectifying a second AC voltage. It is a special feature that It is an.

According to the present invention, when the first AC voltage is input by the winding connection switching means, the two windings of the transformation element are connected in parallel, and the winding is switched to a voltage higher than the first AC voltage. When the second AC voltage is input, the two windings of the transformation element are switched to series connection, and the rectifying element switching means switches the connection between the two windings of the transformation element by the winding connection switching means. In response to the above, a plurality of rectifying elements of the rectifying and smoothing circuit are switched and connected so that a rectification of the first AC voltage and a rectification of the second AC voltage have the same rectification method.

[0007] Therefore, the apparatus itself can be configured as a single unit, and can correspond to each AC power supply that supplies a different voltage (for example, 200 V, 100 V, etc.) at high and low levels. In addition to this, measures for suppressing harmonics generated when a high voltage (for example, 200 V) is input are also thorough.

According to a second aspect of the present invention, in the power supply apparatus of the first aspect, the winding connection switching means includes:
The rectifying element switching means is connected between an AC power supply and a rectifying / smoothing circuit. The rectifying element switching means is connected to an input / output side of the transforming element. In the positive and negative half cycles, one rectifying element and one capacitive element are involved in the rectifying operation, and when rectifying the second AC voltage, two rectifying elements and two capacitive elements are used in the positive and negative half cycles, respectively.
It is characterized by being constituted by one single-pole single-throw switch in which two rectifying elements and two capacitive elements are involved in the rectifying operation.

According to the present invention, there is provided a simple configuration using one double-pole double-throw switch as the winding connection switching means and one single-pole single-throw switch as the rectifying element switching means. The same operation as the power supply device of (1) can be exhibited.

According to a third aspect of the present invention, in the power supply unit of the first aspect, the winding connection switching means includes:
The rectifying element switching means is constituted by one double-pole double-throw switch connected to the input / output side of the transforming element. The rectifying element switching means passes a current from an AC power supply through the rectifying / smoothing circuit side and one winding of the transforming element. A double-pole double-throw switch for switching between the AC power supply and one of the windings of the transformer and the rectifying and smoothing circuit of the winding of the transformer and one of the windings of the transformer. It is characterized by comprising two single-pole single-throw switches connected to each other.

According to the present invention, a single double-pole double-throw switch is used as the winding connection switching means, and one double-pole double-throw switch and two single-pole single-throw switches are used as the rectifying element switching means. With such a configuration, the same operation as the power supply device according to the first aspect can be exhibited.

According to a fourth aspect of the present invention, in the power supply device of the first aspect, the winding connection switching means includes:
The rectifying element switching means is constituted by one double-pole, double-throw switch connected to the input / output side of the metamorphic element. It is characterized by comprising one double-pole double-throw switch and one single-pole single-throw switch connected in series with the connection point of the capacitive element.

According to the present invention, one double-pole double-throw switch is used as the winding connection switching means, and one double-pole double-throw switch and one single-pole single-throw switch are used as the rectifying element switching means. With a simple configuration, the same operation as the power supply device according to the first aspect can be exhibited.

According to a fifth aspect of the present invention, in the power supply unit of the first aspect, the winding connection switching means includes:
The rectifying element switching means is constituted by one double-pole double-throw switch connected to the input / output side of the transforming element. The rectifying element switching means passes a current from an AC power supply through the rectifying / smoothing circuit side and one winding of the transforming element. And a single-pole single-throw switch connected between a connection point of a plurality of capacitance elements and a connection point of a plurality of rectification elements in the rectifying / smoothing circuit. It is characterized by becoming.

According to the present invention, one double-pole double-throw switch is used as the winding connection switching means, and one double-pole double-throw switch is used as the rectifying element switching means, as in the case of the power supply apparatus according to the fourth aspect of the present invention. With a simple configuration using a switch and one single-pole single-throw switch, the same operation as the power supply device according to claim 1 can be exhibited.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) A power supply according to Embodiment 1 of the present invention shown in FIG.
The voltage is input to a rectifying / smoothing circuit 3 of a double voltage system comprising four diodes D1 to D4 and two capacitors (electrolytic capacitors) C1 and C2 via a choke coil 2 having two windings 2a and 2b. A predetermined DC voltage rectified and smoothed by the rectification smoothing circuit 3 is supplied to the load R.

Further, this power supply device includes any one of the four diodes D1 to D4 of the rectifying and smoothing circuit 3.
A single-pole / single-throw (one-circuit / one-contact) type rectification changeover switch S1 for switching the circuit into a circuit configuration involving the rectification operation; and a choke coil 2 connected between the AC power supply 1 and the rectification smoothing circuit 3. The connection configuration of the two windings 2a and 2b is defined as a parallel connection according to the input voltage AC100V and an input voltage AC
Bipolar double throw (1) to switch to series connection according to 200V
2) type changeover switch S2.

The rectification changeover switch S1 is connected to the AC power supply 1
And two capacitors C of the rectifying / smoothing circuit 3
1, C2 connection point.

The changeover switch S2 includes an input-side switch section S21 connected to the input sides of the two windings 2a and 2b of the choke coil 2, and two windings 2a and 2b of the choke coil 2.
An output-side switch section S22 connected to the output side of 2b.

In the input-side switch section S21 and the output-side switch section S22, a terminal provided with a switching piece has a suffix 2,
The following description will be made by adding subscripts 1 and 3 to each terminal having two contacts.

Each terminal of the subscript 2 of the input side switch section S21 and the output side switch section S22 is connected to the input side and the output side of the winding 2b of the choke coil 2, respectively.

Each terminal of the subscript 1 of the input side switch section S21 and the output side switch section S22 is connected to the input side of the winding 2a of the choke coil 2 (one terminal section of the AC power supply 1).
And the output side.

Further, the terminal of the suffix 3 of the input side switch section S21 is connected to the connection point between the cathode of the diode D4 and the anode of the diode D2 of the rectifying and smoothing circuit 3.

Further, the terminal of the subscript 3 of the output side switch section S22 is connected to the other terminal section of the AC power supply 1.

The rectifying and smoothing circuit 3 comprises four diodes D1 to D4 and two capacitors C1 and C2. The anode of the diode D1 and the cathode of the diode D4 are connected to the output side of the winding 2a of the choke coil 2. , The cathode of the diode D1 and the cathode of the diode D2 are connected to the positive side of the load R and the capacitor C1, respectively, and the anode of the diode D3 and the anode of the diode D4 are connected to the negative side of the load R and the capacitor C2, respectively. Further, the cathode of the diode D3 is connected to the anode of the diode D1.

Next, the operation of the power supply device according to the first embodiment having the above configuration will be described.

When the voltage of the AC power supply 1 is 100 V, the rectification changeover switch S1 is turned on, and the switching pieces of the input side switch section S21 and the output side switch section S22 are respectively switched to the suffix 1 side. .

As a result, the windings 2a and 2b of the choke coil 2 are connected in parallel, and the parallel portion of the windings 2a and 2b of the choke coil 2 from the AC power supply 1, the diode D1,
The current path of the capacitor C1, the rectification changeover switch S1, and the AC power supply 1, the AC power supply 1, the rectification changeover switch S1,
A current path of a capacitor C2, a diode D3, a parallel portion of the windings 2a and 2b of the choke coil 2, and an AC power supply 1 is repeatedly formed every positive and negative half cycle of the AC current. DC voltage is supplied.

On the other hand, when the voltage of the AC power supply 1 is 200 V
In this case, the rectification changeover switch S1 is turned off, and the switching pieces of the input side switch section S21 and the output side switch section S22 are each switched to the subscript 3 side.

As a result, the windings 2a and 2b of the choke coil 2 are connected in series by the input switch S21 and the output switch S22 with the rectifying and smoothing circuit 3 interposed therebetween.

In this case, the winding 2a of the choke coil 2, the diode D1, the capacitor C1,
Capacitor C2, diode D4, input side switch section S
21, the winding 2b of the choke coil 2, the output side switch unit S
22, the current path of the AC power supply 1, the AC power supply 1, the output side switch section S22, the winding 2b of the choke coil 2, the input side switch section S21, the diode D2, the capacitor C1, the capacitor C2, the diode D3, and the choke coil 2. A current path called a current path of the winding 2 a and the AC power supply 1 is
The rectifying / smoothing circuit 3 supplies a predetermined DC voltage to the load R, which is formed repeatedly every positive and negative half cycles of the AC current.

In this case, the winding 2a of the choke coil 2
Since 2b is connected in series, the combined inductance is four times that in the case of 100V, and harmonics due to the 200V voltage of the AC power supply 1 are effectively suppressed.

As described above, according to the power supply device of the first embodiment, a single power supply device for the case where the voltage of the AC power supply 1 is 100 V or 200 V can be obtained by only the switching operation of the switches. It is possible to cope with the problem and to eliminate a burden on the user. Further, the voltage of the choke coil 2 is 100 V,
By switching the connection in the case of 00V, the countermeasures for suppressing the harmonics are also thorough.

(Embodiment 2) Next, a power supply unit according to Embodiment 2 will be described in detail with reference to FIG.

In the power supply according to the second embodiment shown in FIG. 2, elements having the same functions as those in the power supply according to the first embodiment are denoted by the same reference numerals.

The power supply device according to the second embodiment shown in FIG. 2 has the same basic configuration as that of the first embodiment, but includes another single-pole single-throw rectifier in addition to the rectification switch S1. The addition of the changeover switch S11, the changeover switch S
2, two double-pole double-throw changeover switches S5,
The feature is that S6 is used.

The rectifying switch S1 is connected between the winding 2a of the choke coil 2 and the connection point of the capacitors C1 and C2. The rectification changeover switch S11 is
The other terminal of the AC power supply 1 and the winding 2 of the choke coil 2
a.

In the input-side switch section S51 and the output-side switch section S52 of the changeover switch S5, a subscript 2 is assigned to a terminal having a switching piece, and a subscript 1 is assigned to each terminal having two contacts.
The following description is given with reference to 3.

Each terminal of the subscript 2 of the input side switch unit S51 and the output side switch unit S52 of the changeover switch S5 is connected to one terminal of the AC power supply 1 and the anode of the diode D1.

Each terminal of the subscript 1 of the input side switch unit S51 and the output side switch unit S52 of the changeover switch S5 is directly connected. Further, each terminal of the subscript 3 of the input side switch section S51 and the output side switch section S52 of the changeover switch S5 is connected to the input side and the output side of the winding 2a of the choke coil 2, respectively.

The input switch S61 of the changeover switch S6 and the subscript 1 of the output switch S62 are connected to the input and output sides of the winding 2a of the choke coil 2, respectively. Each terminal of the subscript 2 in the input side switch unit S61 and the output side switch unit S62 is connected to the input side and the output side of the winding 2b of the choke coil 2, respectively. Further, the terminal of the subscript 3 of the input side switch section S61 is connected to the cathode of the diode D4. Further, the terminal of the suffix 2 of the output side switch section S62 is connected to the other terminal section of the AC power supply 1.

Next, the operation of the power supply device according to the second embodiment having the above configuration will be described.

When the voltage of the AC power supply 1 is 100 V, the rectifying switches S1 and S2 are turned on, and the input switches S51 and S51, the output switches S52 and S52 of the switches S5 and S6 are turned on. In S62, each switching piece is switched to the subscript 1 side.

Thus, the windings 2a and 2b of the choke coil 2 are connected in parallel by the changeover switch S6, and the changeover switch S5, the diode D1, the capacitor C1, the rectification changeover switch S1, and the choke coil 2 are connected from the AC power supply 1.
The current path of the parallel portion of the windings 2a and 2b, the rectification changeover switch S11, and the AC power supply 1, and the parallel portion of the AC power supply 1, the rectification changeover switch S11, and the windings 2a and 2b of the choke coil 2, the rectification changeover switch S1,. A current path including a capacitor C2, a diode D3, a changeover switch S5, and an AC power supply 1 is repeatedly formed every positive and negative half cycle of the AC current, and a predetermined DC voltage is supplied to the load R from the rectifying and smoothing circuit 3.

On the other hand, when the voltage of the AC power supply 1 is 200 V
In this case, the rectification changeover switches S1 and S2 are turned off, and the switching pieces of the input side switch sections S51 and S51 and the output side switch sections S52 and S62 of the changeover switches S5 and S6 are respectively switched to the subscript 3 side. .

By the changeover switch S6, the windings 2a and 2b of the choke coil 2 are connected in series with the rectifying and smoothing circuit 3 interposed therebetween.
Input side switch section S51, winding 2 of choke coil 2
a, output side switch section S52 of changeover switch S5, diode D1, capacitor C1, capacitor C2, diode D4, input side switch section S61 of changeover switch S6, winding 2b of choke coil 2, and output side switch section of changeover switch S6 S62, a current path of the AC power supply 1, the AC power supply 1, the output switch S62 of the changeover switch S6, the winding 2b of the choke coil 2, the input switch S61 of the changeover switch S6, the diode D2, the capacitor C1, and the capacitor C2. The current path of the diode D3, the output switch S52 of the changeover switch S5, the winding 2a of the choke coil 2, the input switch S51 of the changeover switch S5, and the AC power supply 1 is connected every positive and negative half cycle of the AC current. A predetermined DC voltage is supplied to the load R from the rectifying and smoothing circuit 3 repeatedly.

In this case, the winding 2a of the choke coil 2
Since 2b is connected in series, the combined inductance is four times that in the case of 100V, and harmonics due to the 200V voltage of the AC power supply 1 are effectively suppressed.

As described above, according to the power supply device of the second embodiment, a single power supply device for the case where the voltage of the AC power supply 1 is 100 V and the case where the voltage of the AC power supply 1 is 200 V can be obtained simply by switching the switches. It is possible to cope with the problem and to eliminate a burden on the user. Further, the voltage of the choke coil 2 is 100 V,
By switching the connection in the case of 00V, the countermeasures for suppressing the harmonics are also thorough.

Third Embodiment Next, a power supply device according to a third embodiment will be described in detail with reference to FIG.

In the power supply device of the third embodiment shown in FIG. 3, elements having the same functions as those of the power supply device of the first embodiment are denoted by the same reference numerals.

The power supply device according to the third embodiment shown in FIG. 3 has a basic configuration substantially the same as that of the first embodiment, but includes two double-pole double-throw type switches having the same configuration as the changeover switch S2. The changeover switches S7 and S8 are used, and the connection configuration of the rectifying and smoothing circuit 3 is slightly changed.

That is, the winding 2a of the choke coil 2
, A changeover switch S7 and a rectification changeover switch S1 are connected in series between the AC power supply 1 and a connection point of the capacitors C1 and C2.

In the rectifying and smoothing circuit 3, the diode D
An anode 2 and a cathode of the diode D3 are connected to a connection point between the changeover switch S7 and the rectification changeover switch S1, respectively. The cathode of the diode D4 is connected to the anode of the diode D1.

The connection configuration of the changeover switches S7 and S8 is as follows. The suffix 2 terminal of the input side switch unit S71 of the changeover switch S7 is connected to the output side of the winding 2a of the choke coil 2 and the suffix 1 terminal of the output side switch unit S82 of the changeover switch S8. In the changeover switch S7, the subscript 1 terminals of the input side switch section S71 and the output side switch section S72 are directly connected. Further, the terminal of the subscript 3 of the input side switch section S71 of the changeover switch S7 is connected to the terminal of the subscript 3 of the input side switch section S81 of the changeover switch S8.
Is connected to the subscript 3 terminal of the output side switch unit S82 of the changeover switch S8.

On the other hand, the terminal of the subscript 2 of the input side switch section S81 in the changeover switch S8 is connected to the choke coil 2
Of the output side switch section S82 on the input side of the winding 2b.
Are connected to the output side of the winding 2b of the choke coil 2, respectively.

Next, the operation of the power supply device according to the third embodiment having the above configuration will be described.

When the voltage of the AC power supply 1 is 100 V, the rectification changeover switch S1 is turned on, and the input side switch sections S71 and S71 of the changeover switches S7 and S8 are turned on.
S81, the respective switching pieces of the output side switch sections S72 and S82 are each switched to the subscript 1 side.

Thus, the windings 2a and 2b of the choke coil 2 are connected in parallel by the changeover switch S8, and the diode D1, the capacitor C1, the rectification changeover switch S1, the changeover switch S7 and the choke coil 2 are supplied from the AC power supply 1.
And a current path of an AC power supply 1 and a winding 2a, 2b of a choke coil 2 from the AC power supply 1.
, A changeover switch S7, a rectification changeover switch S1,
A current path including a capacitor C2, a diode D4, and an AC power supply 1 is repeatedly formed every positive and negative half cycle of the AC current, and a predetermined DC voltage is supplied to the load R from the rectifying and smoothing circuit 3.

On the other hand, when the voltage of the AC power supply 1 is 200 V
In this case, the rectification changeover switch S1 is turned off, and the switching pieces of the input side switch sections S71 and S81 and the output side switch sections S72 and S82 of the changeover switches S7 and S8 are each switched to the subscript 3 side.

By the changeover switch S8, the windings 2a and 2b of the choke coil 2 are connected in series.
Diode D1, capacitor C1, capacitor C2, diode D3, output switch S72 of switch S7, output switch S82 of switch S8, winding 2b of choke coil 2, switch S
8, the input side switch section S81, the input side switch section S71 of the changeover switch S7, the winding 2a of the choke coil 2, the current path of the AC power supply 1, the AC power supply 1 to the winding 2a of the choke coil 2, and the changeover switch S7. Input switch S
71, the input switch S81 of the changeover switch S8, the winding 2b of the choke coil 2, the output switch S82 of the changeover switch S8, and the output switch S7 of the changeover switch S7.
2, diode D2, capacitor C1, capacitor C2
, A diode D4 and an AC power supply 1 are repeatedly formed for each of the positive and negative half cycles of the AC current.
Is supplied with a predetermined DC voltage from the rectifying / smoothing circuit 3.

In this case, the winding 2a of the choke coil 2
Since 2b is connected in series, the combined inductance is four times that in the case of 100V, and harmonics due to the 200V voltage of the AC power supply 1 are effectively suppressed.

As described above, according to the power supply device of the second embodiment, a single power supply device for the case where the voltage of the AC power supply 1 is 100 V and the case for the case where the voltage of the AC power supply 1 is 200 V can be obtained simply by switching the switches. It is possible to cope with the problem and to eliminate a burden on the user. Further, the voltage of the choke coil 2 is 100 V,
By switching the connection in the case of 00V, the countermeasures for suppressing the harmonics are also thorough.

(Embodiment 4) Next, a power supply device according to Embodiment 3 will be described in detail with reference to FIG.

In the power supply according to the third embodiment shown in FIG. 4, elements having the same functions as those of the power supply according to the first embodiment are denoted by the same reference numerals.

The basic configuration of the power supply device of the fourth embodiment shown in FIG. 4 is substantially the same as that of the first embodiment, except that two double-pole double-throw type switches having the same configuration as the changeover switch S2 are provided. The changeover switches S9 and S10 are used, and the connection configuration of the rectifying and smoothing circuit 3 is slightly changed.

In the rectifying / smoothing circuit 3, the rectifying switching circuit S1 is connected to the connection point between the capacitors C1 and C2 and the diode D
2 and connected to the anode.

The connection configuration of the changeover switches S9 and S10 is as follows. That is, the terminals indicated by the suffix 1 of the input side switch unit S91 and the output side switch unit S92 of the changeover switch S9 are directly connected. The terminal indicated by the suffix 2 of the input side switch unit S91 is connected to the AC power supply 1, and the terminal indicated by the suffix 2 of the output side switch unit S92 is connected to the anode of the diode D1.

Further, the terminal indicated by the suffix 3 of the input side switch unit S91 of the changeover switch S9 is replaced by the terminal indicated by the suffix 3 of the output side switch unit S102 of the changeover switch S10, and the subscript of the output side switch unit S92 of the changeover switch S9. The terminal indicated by 3 is connected to the terminal indicated by the suffix 3 of the input side switch section S101 of the changeover switch S10.

On the other hand, in the changeover switch S10, the terminal indicated by the suffix 2 of the input side switch section S101 is connected to the input side of the winding 2a of the choke coil 2, and the terminal indicated by the suffix 2 of the output side switch section S102 of the changeover switch S10. Are respectively connected to the output side of the winding 2 of the choke coil 2. The input side of the winding 2b of the choke coil 2 is connected to the AC power supply 1 by the winding 2b.
The output side of b is connected to the cathode of the diode D4.

Next, the operation of the power supply according to the fourth embodiment having the above configuration will be described.

When the voltage of the AC power supply 1 is 100 V, the rectification changeover switch S1 is turned on, and the input side switch sections S91 and S91 of the changeover switches S9 and S10 are turned on.
In step S101, the switching pieces of the output-side switch sections S92 and S102 are switched to the suffix 1 side.

Thus, the windings 2a and 2b of the choke coil 2 are connected in parallel by the changeover switch S10, and the changeover switch S9, the diode D1, the capacitor C1, the rectification changeover switch S1, and the changeover switch S1 are supplied from the AC power supply 1.
0, a parallel portion of the windings 2a and 2b of the choke coil 2, a switching switch S10, and a current path of the AC power supply 1, and a switching switch S10 from the AC power supply 1, a parallel portion of the windings 2a and 2b, a switching switch S10, and rectification switching. Switch S1, capacitor C
2. A current path including a diode D3, a changeover switch S9, and an AC power supply 1 is repeatedly formed every positive and negative half cycle of the AC current, and a predetermined DC voltage is supplied to the load R from the rectifying and smoothing circuit 3.

On the other hand, when the voltage of the AC power supply 1 is 200 V
In this case, the rectification changeover switch S1 is turned off, and the input side switch units S91, S91 in the changeover switches S9, S10 are turned off.
S101, the respective switching pieces of the output side switch sections S92 and S102 are switched to the subscript 3 side.

By the changeover switch S10, the windings 2a and 2b of the choke coil 2 are connected in series.
From the AC power supply 1 to the input side switch section S of the changeover switch S9
91, output side switch section S102 of changeover switch S10, winding 2a, input side switch section S101 of changeover switch S10, output side switch section S92 of changeover switch S9, diode D
1, capacitors C1, C2, diode D4, winding 2
b, a current path of AC power supply 1, AC power supply 1, winding 2
b, diode D2, capacitors C1, C2, diode D3, output switch S92 of changeover switch S9, input switch S101 of changeover switch S10, winding 2a,
The output side switch section S102 of the changeover switch S10, the input side switch section S91 of the changeover switch S9, and the current path of the AC power supply 1 are repeatedly formed for each positive and negative half cycle of the AC current. Is supplied.

In this case, the winding 2a of the choke coil 2
Since 2b is connected in series, the combined inductance is four times that in the case of 100V, and harmonics due to the 200V voltage of the AC power supply 1 are effectively suppressed.

As described above, according to the power supply device of the fourth embodiment, a single power supply device for the case where the voltage of the AC power supply 1 is 100 V and the case for the case where the voltage of the AC power supply 1 is 200 V can be obtained simply by switching the switches. It is possible to cope with the problem and to eliminate a burden on the user. Further, the voltage of the choke coil 2 is 100 V,
By switching the connection in the case of 00V, the countermeasures for suppressing the harmonics are also thorough.

[0078]

According to the first aspect of the present invention, the apparatus itself has a single structure, and can correspond to each AC power supply that supplies different voltages at high and low levels. It is possible to provide a power supply device capable of preventing increase in the number of harmonics and suppressing harmonics generated when a high voltage is input.

According to the second aspect of the invention, a simple configuration using one double-pole double-throw switch as the winding connection switching means and one single-pole single-throw switch as the rectifying element switching means is provided. A power supply having the same effects as the power supply according to claim 1 can be provided.

According to the third aspect of the present invention, one double pole double throw switch is used as the winding connection switching means, and one double pole double throw switch and two single pole single throw switches are used as the rectifying element switching means. A power supply device having the same effect as that of the power supply device according to claim 1 can be provided with a simple configuration using.

According to the fourth aspect of the present invention, one double pole double throw switch is used as the winding connection switching means, and one double pole double throw switch and one single pole single throw switch are used as the rectifying element switching means. A power supply device having the same effect as the power supply device of the first aspect can be provided with a simple configuration using a switch.

According to the fifth aspect of the present invention, one double-pole double-throw switch is used as the winding connection switching means, and one rectifying element switching means is used as in the case of the power supply apparatus according to the fourth aspect of the present invention. With a simple configuration using the double-pole double-throw switch and one single-pole single-throw switch, it is possible to provide a power supply having the same effects as the power supply according to the first aspect.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a power supply device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a power supply device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a power supply device according to Embodiment 3 of the present invention.

FIG. 4 is a circuit diagram showing a power supply device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Choke coil 2a winding 2b winding 3 Rectifier smoothing circuit D1 diode D2 diode D3 diode D4 diode C1 capacitor C2 capacitor R load S1 changeover switch S2 changeover switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H02M 7/08 H02M 7/08 // H02J 3/00 H02J 3/00 E

Claims (5)

[Claims] 1. An AC voltage from an AC power supply is input.
A power supply device comprising: a transformer having a winding; and a rectifying and smoothing circuit using a plurality of rectifiers and a capacitor that supplies a DC voltage to a load by rectifying and smoothing an AC voltage passing through the transformer, Winding connection switching means for switching the two windings of the transformation element to a parallel connection when the first AC voltage is applied, and to a series connection when the second AC voltage is higher than the first AC voltage; In response to the connection switching of the two windings of the transformer element by the winding connection switching means, the plurality of rectifying elements of the rectifying / smoothing circuit rectify the first AC voltage and rectify the second AC voltage. And a rectifier switching means for switching and connecting the rectifiers so as to have the same rectification method. 2. The switching device according to claim 1, wherein the winding connection switching means includes one double-pole double-throw switch connected to an input / output side of the transformer. The rectifier is connected between the first AC voltage and the positive and negative half cycles in the positive and negative half cycles when rectifying the first AC voltage, and the positive and negative half cycles when rectifying the second AC voltage. 2. The power supply device according to claim 1, wherein each of the two power supply devices comprises one single-pole single-throw switch that causes two rectifying elements and two capacitive elements to participate in the rectifying operation. 3. The winding connection switching means is constituted by one double-pole double-throw switch connected to the input / output side of the transformer, and the rectifying element switching means rectifies a current from an AC power supply. One double-pole double-throw switch for switching between the smoothing circuit side and the side passing through one winding of the transformation element; and 2. The power supply device according to claim 1, comprising two single-pole single-throw switches connected between the rectifying / smoothing circuit and the rectifying / smoothing circuit. 4. The winding connection switching means comprises a single double-pole double-throw switch connected to the input / output side of the transformer, and the rectifier switching means comprises one winding of the transformer. And a single-pole double-throw switch and a single-pole single-throw switch connected in series between the rectifying / smoothing circuit side and a connection point of a plurality of capacitive elements of the rectifying / smoothing circuit. The power supply device according to claim 1. 5. The winding connection switching means is constituted by one double-pole double-throw switch connected to the input / output side of the transformer, and the rectifying element switching means rectifies a current from an AC power supply. One double-pole double-throw switch for switching between the smoothing circuit side and the side passing through one of the windings of the transformation element; and The power supply device according to claim 1, comprising one connected single-pole single-throw switch.