JPH1050493A - Lighting device and power supply method - Google Patents

Abstract

(57) Abstract: An object of an AC power supply circuit is to reduce a discontinuous portion of a current waveform by removing a power supply harmonic component. SOLUTION: In an illuminating device for illuminating a lighting lamp by supplying a commercial power supply, a power component for reducing a harmonic component of a power source for illuminating the lighting lamp to a predetermined level or less is supplied to a resistance load. And Further, in a lighting device for illuminating a lamp by supplying a commercial power through a power supply circuit, a power component for illuminating the lamp with a harmonic component of the commercial power not more than a predetermined level is supplied to the power supply circuit. Is supplied for biasing the semiconductor element. Further, in a lighting device for supplying and illuminating a commercial power supply to a lighting lamp through a power supply circuit, the lighting device may further include a power component for lowering a harmonic component of the commercial power supply for lighting the lighting lamp to a predetermined level or less. Is supplied for heating the hot cathode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device,
In particular, the present invention relates to a lighting device in which a harmonic component of a power supply for an illumination lamp is reduced and a power supply method capable of reducing a harmonic component of a commercial power supply.

[0002]

2. Description of the Related Art Conventionally, many electric and electronic devices are driven by a commercial power supply, and have made many contributions to social life. This commercial power supply is supplied with a voltage waveform that is almost a sine wave on the power supply side, but the current waveform supplied to the electric / electronic device has a single frequency sine wave when the load is a linear load. However, in the case of a non-linear load, a sinusoidal wave of a single frequency is not formed but a harmonic component is included. When the harmonic component increases, there arises a problem that a temperature rise or the like is caused in a power distribution system of a commercial power supply, particularly, a power factor improving capacitor. Therefore, it is desired to reduce harmonic components contained in the current waveform of the electric / electronic device. In particular, in recent years, "Guidelines for measures to suppress harmonics in home appliances and general-purpose products"
Is notified, and a harmonic level lower than a specified level is desired. This regulation states that balanced three-phase equipment as class A and all equipment not belonging to any other class shall be classified as class B
A hand-held power tool, a lighting device as a class C, and a device having a specific input current and an effective input power of 600 W or less based on a specific measuring method are applied as a class D. In addition, the limit value of the n-th harmonic of the class C applied to the lighting equipment is 2% or less for the second harmonic, and the maximum value (%) expressed as a percentage of the fundamental wave input current is 3% or less. 30 × λ (λ is the power factor of the circuit)% or less, 5th order is 10%
% Or less, 7th order is 7% or less, 9th order is 5% or less, 11 ≦ n ≦
The 39 harmonics are recommended to be 3% or less.

[0003] The reduction of harmonics is introduced as "Trend of Power Supply Harmonic Reduction Measures in Lighting Inverters" in Journal of the Illuminating Engineering Institute, Vol. 79, No. 6, No. 9 and No. 10. Regarding an active filter as one method of improving efficiency, an example using a dedicated IC is introduced on page 338 of "Switching Power Supply Handbook" issued by Nikkan Kogyo Shimbun. By connecting a fluorescent lamp inverter to the load of the active filter circuit using this dedicated IC as shown in FIG. 12, harmonics can be removed. According to FIG. 12, an AC waveform applied with a general commercial voltage as a power supply voltage and converted into a pulsating current by a bridge rectifier is output through an active filter unit and an inverter unit for approximately 5 minutes.
The frequency is converted to a high frequency of 0 kHz, and the illumination lamp LAMP is turned on. The active filter section includes a boost inductor L100, a switching element Q100, a control IC (ML4812 manufactured by US Micro Linear Corporation in this example is used), a backflow prevention diode D100, and smoothing capacitors C (S) 1 and C (S). 2) With the operation 2), a DC power of about 380 V is generated while the power supply harmonic level is kept low. The other component is a component that performs an auxiliary operation for stably operating the active filter unit. In addition,
For the internal operation of the dedicated IC, refer to the manual.

[0004]

However, the above electronic ballast for fluorescent lamps, which is for removing harmonics, requires each circuit configuration and a control circuit for controlling each element. Is extremely complicated and costly, so that not only general fluorescent lamp lighting but also commercial fluorescent lamp lighting requires a large housing for the entire apparatus, which is not suitable for the majority of fluorescent lighting. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lighting apparatus and a power supply method which are simple in circuit configuration and low in cost, as well as reducing power supply harmonic components to a required level or less.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and detects a discontinuous time during which no current flows in an input stage of a commercial power supply and in a partial smoothing circuit section, and detects the discontinuous time during the period. By causing a load current to flow, the current waveform is made substantially sinusoidal in the same manner as the voltage waveform, thereby reducing harmonic components of the power supply.

More specifically, in a lighting device for illuminating a lighting lamp by supplying a commercial power supply, a full-wave rectifier circuit for full-wave rectifying the commercial power supply, and a partial smoother for partially smoothing the output of the full-wave rectifier circuit. Circuit, and an inverter circuit that switches the output of the partial smoothing circuit at a high speed, and detects a discontinuous period of the commercial power supply current by the partial smoothing circuit to reduce a harmonic component of the commercial power supply to a predetermined level or less. And supplying a power component to the resistive load of the commercial power supply.

In a lighting apparatus for illuminating a lighting lamp by supplying a commercial power supply through a power supply circuit, a power component for lowering a harmonic component of the commercial power supply for illuminating the lighting lamp to a predetermined level or less. The power is supplied for biasing a semiconductor element of the power supply circuit.

Further, in an illuminating device for illuminating a lighting lamp by supplying a commercial power supply through a power supply circuit, a power component for lowering a harmonic component of the commercial power supply for illuminating the lighting lamp to a predetermined level or less. The heating lamp is supplied to heat the hot cathode of the illumination lamp.

In addition, in a power supply method for supplying a commercial power supply to a non-linear load, a discontinuous portion of a load current supplied from the commercial power supply is detected based on the non-linearity of the load, and during this detection period, The commercial power supply is supplied to a resistor of a part of the load, a hot cathode of a part of the load, or a semiconductor bias of a part of the load.

[0011]

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

(First Embodiment) FIG. 1A is a block diagram according to a first embodiment of the present invention, FIG. 1B is a circuit diagram of the comparison control unit, and FIG. The conceptual diagram of resistance consumption is shown.

In FIG. 1A, an AC power supply is connected to a full-wave rectifier circuit D1, and the other terminal is connected to a current transformer C1.
Connected via T. The DC output of the rectifier circuit D1 is connected to a fluorescent lamp inverter INV, which drives the fluorescent lamp to emit fluorescent light for illumination. The full-wave rectified DC output of the rectifier circuit D1 causes a temporary load current to flow through the switch SW1 and the resistor R. The switch SW1 compares the output of the current transformer CT with the comparison control unit CC and turns on / off by the drive control output. Turned off.

Next, as shown in FIG. 1B, the comparison control unit CC outputs the output of the current transformer CT to the full-wave rectifier circuit D.
2 and its output to the comparator OP1.
When the voltage is lower than the reference voltage Vr, the switch SW1 is turned on. When the switch SW1 is turned on, a current corresponding to the DC output voltage flows through the resistor R, and a load current flows through the resistor R during a discontinuous period of the current having the original impulse waveform.
To explain this phenomenon more conceptually, as shown in FIG. 1C, a pulse-shaped current I flows with respect to a sinusoidal voltage waveform V depending on the load state of the fluorescent lamp inverter.
When the current i shown by the cross hatching flows through the resistor R,
As a whole, a current having a sine waveform similar to the voltage waveform flows, and harmonic components of the current waveform can be reduced.

According to this embodiment, the current transformer CT and the comparison control unit CC added for removing harmonic components are provided.
Table 1 shows comparison results between the case where the resistor R and the switch SW1 are not provided and the case where the resistor R and the switch SW1 are provided.

[0016]

[Table 1] In this way, it is proved that even in the case of an odd-numbered order, it falls within the range of the standard according to the “Guideline for Countermeasures for Harmonic Suppression of Home Appliances / General-purpose Products”.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
FIG. 3 is a configuration block diagram according to the embodiment. In the figure, an AC power supply is connected to a full-wave rectifier circuit D3 to perform full-wave rectification.
Through the constant current inductor L3 and the smoothing capacitor C
3, a diode D4, D5, and an inductor L4 as an impedance element.

The operation of the partial smoothing circuit will be described. However, conceptually, please refer to “Journal of the Illuminating Engineering Institute, Vol. 72, NO5, pp. 292 to 294” aimed at high power factor and high efficiency. First, a full-wave rectifier circuit D3 is connected to the input of the low-current inductor L3.
Of the full-wave rectified waveform of the inverter INV2
Oscillates at a high frequency within the full-wave rectified voltage envelope according to the rectified voltage to light the illumination lamp of the load. At this time, the voltage applied to both ends of the constant current inductor L3 is as shown in FIG.
Then, the negative voltage of the voltage between both ends is charged to the smoothing capacitor C3. Here, when the charge voltage of the smoothing capacitor C3 is higher than the full-wave rectified voltage, it is supplied from the smoothing capacitor C3 to the constant current inductor L3 through the diode D5 and consumed by the inverter INV2. Therefore, when the charge voltage of the smoothing capacitor C3 is higher than the full-wave rectified voltage, a current flows through the diode D5, and this time corresponds to a discontinuous period of the full-wave rectified current. Note that the inductor L4 in series with the diode D4 reduces the DC voltage _VDC of the smoothing capacitor C3 to a partial smoothing ratio of 0.5 to 0.6.
It is an impedance element for lowering the _voltage to V _DC , and also prevents inrush current to the smoothing capacitor C3 and protects the diode D4.

Thus, the partially smoothed output is supplied to the fluorescent lamp inverter INV2 serving as a load. The fluorescent lamp inverter INV2 has a predetermined high-frequency oscillation circuit. The high-frequency signal is subjected to full-wave rectification by the full-wave rectifier circuit D3 and then oscillates with a waveform enclosing a partially smoothed waveform. Drive the fluorescent lamp which is the load of the inverter INV2 for high frequency. The DC output that has been full-wave rectified by the full-wave rectifier circuit D3 is connected to a switch SW2 and a resistor R2.
And is short-circuited. The trigger signal of the switch SW2 is such that a current flows through the diode D5 only during a discontinuous period of the full-wave rectified current (a period during which a harmonic component is generated).
This current signal is detected by the current detection means ID1 and output to the comparison control unit CC2. Specifically, as shown in FIG. 2B, the comparison control unit CC2 detects the current flowing through the diode D5 with the resistor R3, converts the current into a voltage, inputs the voltage to the comparator OP2, and outputs the voltage from the reference voltage Vr2. When it is smaller, the switch SW2 is turned on. Thereby, by flowing a current through the resistor R2, as described in the first embodiment, by flowing a load current through the resistor R2 during a discontinuous period of the current in which a harmonic component occurs, a waveform close to a sine wave is obtained. Current is AC
It will be supplied from the power supply.

(Third Embodiment) FIG. 3 is a circuit diagram of a lighting device specifically showing the current detecting means and the comparison control unit shown in FIG. 2, and FIG. 4 is a waveform diagram of each unit. This will be described in detail.

In FIG. 3, a commercial AC power supply AC is full-wave rectified by a diode bridge DB of a full-wave rectifier circuit via a noise filter NF. The full-wave rectified power is supplied to the constant current inductor L via the backflow prevention diode D4.
1. Smoothing is performed by a partial smoothing circuit including a smoothing capacitor C1, diodes D1 and D2, and an inductor L2 as an impedance element. The output of the constant current inductor L1 is supplied to a push-pull inverter type switching regulator including two transistors Tr3 and Tr4. The switching regulator includes a base winding N1, a collector winding N2, a transistor Tr3,
A positive feedback oscillation circuit is formed by Tr4 and the like, and the transistors Tr3 and Tr4 are alternately turned on and off, for example, 48
High frequency oscillation of about kHz is performed. Transistor Tr3
Bias resistors R6 and R7 are connected to the base of Tr4 together with the base winding N1, and the output voltage of the constant current inductor L1 is supplied to the collector of the transistor together with the collector winding N2. Oscillation at a predetermined high frequency is caused by the winding N2 of the transformer T1 connected to the collectors of the transistors Tr3 and Tr4 and the winding N1 of the transformer T1 connected to the base.
The high-frequency high-voltage generated at both ends of the secondary winding N3 of the transformer T1 is supplied to the illuminating lamp LAMP.
Lighting is efficiently performed at a frequency of about 8 kHz.

Here, the power supply waveform of the main part of FIG. 3 will be described with reference to the conceptual diagram on the left side of FIG. 4 and the actual waveform diagram on the right side. The voltage across the constant current inductor L1 of the push-pull inverter is as shown in FIG. This negative component is charged in the smoothing capacitor C1, and the capacitor voltage is fed back to the negative side of the full-wave rectifier circuit DB via the diode D2 to obtain a smoothed power supply. The inductor L2 inserted as an impedance element in the charging path of the smoothing capacitor C1 has a negative component charged in the capacitor C1 so as to have a smoothing factor for realizing high power efficiency and a high power factor with respect to an input power supply waveform. Is to reduce. The input current waveform is as shown in FIG.
Further, although the power supply voltage of the inverter has a waveform shown in FIG. 4D, a section A shown in FIG.
1 is higher than the full-wave rectified voltage, the AC rectified power is not supplied to the circuit, and the electric charge charged in the smoothing capacitor C1 flows to the inverter circuit. It can be detected by a photocoupler PC connected in parallel. The section A may be a discontinuous period of the power supply current, and the load current may be applied to the full-wave rectified waveform. The output of this photocoupler PC is 2
The power is amplified by the stage amplifiers Tr2 and Tr1, and this load current is consumed by the resistor R1. Thus, the AC input current waveform consumes the load power also in the section A, so that the current waveform becomes the current waveform shown by the solid line in FIG. 4C, becomes a waveform closer to a sine wave, and the harmonic components are drastically reduced. can do.

In the present embodiment, in the lighting device, a discontinuous portion of the current waveform is detected, and a current is caused to flow through the load resistance at the discontinuous portion, thereby approximating the current waveform to a sine wave. As a result, high input power efficiency and high power factor can be achieved.

(Fourth Embodiment) FIG. 5 shows an example in which an input current waveform is detected by a current transformer provided at an AC input. In FIG. 5, Tr10 and T10 are similar to the above-described push-pull inverter type switching regulator.
r11, a base winding N11 and a collector winding N12 of a transformer T2, and a tuning capacitor C
13, and the bias resistors R12 and R13 constitute a DC-AC inverter together with high-frequency oscillation. The lamp LAMP is turned on by the windings N13 to N15 wound around the inverter transformer T2.

The winding N10 wound around the inverter transformer T2 is connected to a full-wave rectifier circuit DB3, and the rectified output is connected to a smoothing capacitor C11 and a diode D11. The inverter output component is fed back to form a modification of the above-described partial smoothing circuit.

On the other hand, the current transformer CT connected to the AC power supply detects the current component of the AC power supply and performs full-wave rectification by the full-wave rectifier circuit DB2. A capacitor C14 for removing noise and a resistor R15 for obtaining a signal as an output voltage are connected to the output of the full-wave rectifier circuit DB2.
In No. 5, no voltage is generated during the discontinuous period of the input current from the AC power supply, so that the operation of supplying the overload current is performed during this period. That is, the reference voltage is set to be equal to or lower than the operating voltage of the transistor Tr12 only in the input discontinuous period during which no voltage is generated in the resistor R15, and the transistor Tr12 is turned off and the transistor Tr13 is turned on by the volume VR10 for dividing the voltage between both ends of the resistor R15. By applying a load current to the load resistor R17 in accordance with the full-wave rectified AC power supply current, the AC input current waveform is changed as shown in FIG.
The waveform shown in (c) becomes a waveform closer to a sine wave, and the harmonic component can be drastically reduced. That is, in this embodiment, the reference voltage with respect to the detection voltage of the current transformer CT is compared and detected as the base-emitter voltage of the transistor.

(Fifth Embodiment) FIG. 6 shows a fifth embodiment of the present invention.
FIG. 4 is a circuit diagram according to the embodiment. In FIG. 6, AC
The power supply is a full-wave rectifier circuit DB1 via a noise filter NF.
And the full-wave rectified component is supplied to the constant current inductor L2 via the backflow prevention diode D20.
0, smoothing capacitor C20, diodes D21, D2
2. Smoothing is performed by a partial smoothing circuit constituted by an inductor L21 inserted as an impedance element therein. The smoothed output is supplied to the above-described push-pull inverter type switching regulator, and turns on the illumination lamp LAMP.

The component subjected to full-wave rectification by the full-wave rectifier circuit DB1 is divided by a resistor R22 and a variable resistor R23.
The voltage is supplied to the base of the transistor Tr21. When the divided voltage is equal to or lower than the base-emitter voltage as the reference voltage, the transistor Tr21 turns off, and at that time, the transistor Tr20 which is a switching element turns on. Thus, in a state where the component subjected to full-wave rectification is supplied to the inverter via the partial smoothing circuit, the transistor Tr21 is turned off and the transistor Tr20 is turned on only during the discontinuous period of the current component of full-wave rectification. Resistance R2
By loading 0, the current having a waveform close to a sine wave becomes A
It will be supplied from the C power supply. In this way, by flowing a current through the resistor R20 during a discontinuous period in which a harmonic component of the AC power supply current occurs, it is possible to sufficiently satisfy the standard for setting the level to a predetermined harmonic level or less.

(Sixth Embodiment) FIG. 7 shows a sixth embodiment of the present invention.
FIG. 4 is a circuit diagram according to the embodiment. In FIG. 7, AC
The power supply is a full-wave rectifier circuit DB1 via a noise filter NF.
And is full-wave rectified. The full-wave rectified component is supplied to the constant current inductor L1, the smoothing capacitor C1, and the diode D4 through the backflow prevention diode D4 in the same manner as described above.
1, D2 and a partial smoothing circuit composed of an inductor L2 inserted as an impedance element. The partially smoothed output is provided by the resistors R6 and R7, the transistors Tr3 and Tr4, and the winding N3 of the transformer T4.
1, N32, and a tuning capacitor C2. In this manner, the primary winding N32 of the transformer T4 is driven with the waveform of FIG. 4D having a high-frequency component in the envelope formed by full-wave rectification and partial smoothing, and the illumination lamp LAMP connected to the secondary winding N33. Lights up.

On the other hand, FIG.
In section A of (e), which is a discontinuous time during which the harmonic component of the AC power supply can be removed, the photo MOSFET is turned on when flowing through the diode D2, and the full-wave rectified voltage drives the transformer T5. The hot cathode of the illumination lamp LAMP connected to the secondary side of T5 is heated. In this way, as the preheating, the hot cathode of the lamp LAMP is supplied to heat the hot cathode of the lamp LAMP so that the harmonic component of the commercial power supply for illuminating the lamp LAMP is set to a predetermined level or less.

(Seventh Embodiment) FIG. 8 shows a seventh embodiment of the present invention.
FIG. 4 is a circuit diagram according to the embodiment. The same applies to lighting of the illumination lamp LAMP in FIG. That is, the AC power supply is connected to the full-wave rectifier circuit DB1 via the noise filter NF, and is subjected to full-wave rectification. The full-wave rectified component is, as described above, a constant current inductor L1 and a smoothing capacitor C1.
1. Smoothing is performed by a partial smoothing circuit including diodes D1 and D2 and an inductor L2 inserted as an impedance element. The partially smoothed output is supplied to the above-described push-pull inverter type switching regulator including the resistors R6 to R8, the transistors Tr3 and Tr4, the windings N41 and N42 of the transformer T6, and the tuning capacitor C2. Thus, FIG. 4 shows a case where a high-frequency component exists in the envelope due to full-wave rectification and partial smoothing.
The winding N42 of the transformer T6 is driven by the waveform (d), and the illumination lamp LAMP connected to the secondary winding N43 is turned on.

On the other hand, FIG.
Section (e) A is a photo M connected in parallel with the resistor R9.
The OSFET is turned on, and the full-wave rectified voltage is changed to the diode D8.
, A resistor R10, a smoothing capacitor C14, and a Zener diode D10 to obtain a constant voltage, and the transistors Tr3 and Tr4 via a diode D9 and resistors R6 and R7.
Supplied to the base. By supplying the load current for biasing the semiconductor element of the switching regulator during the discontinuous period of the power supply, the operation of the switching regulator, such as high-frequency oscillation, is stabilized. This allows
The waveform of the current supplied from the AC power supply can be made substantially sinusoidal, and harmonic components of the AC power supply can be removed.

(Eighth Embodiment) FIG. 9 shows an eighth embodiment of the present invention.
FIG. 3 is a configuration block diagram according to the embodiment. In the figure, an AC power supply is connected to a full-wave rectifier circuit D8, is full-wave rectified, and the full-wave rectified component is supplied to a power supply circuit unit (smoothing circuit unit) PW1 via a backflow prevention diode D6, and its output is output. Accordingly, the inverter INV3 oscillates at a high frequency to turn on the load lamp.

The full-wave rectifier circuit D8 and the power supply circuit PW1
A period during which the full-wave rectified waveform from the AC power supply is not supplied to the power supply circuit section is detected by the current detection means provided between the power supply circuit section and the current detection section, and outputs the detected period to the comparison control section CC3. Specifically, FIG.
As shown in (b), the voltage generated by the current flowing through the diode D7 is input to the comparator OP3,
When the voltage is lower than the reference voltage Vr3, the switch SW3 is turned on. As a result, a current having a waveform close to a sine wave becomes A by applying a current to the resistor R3, as described in the first and second embodiments.
It will be supplied from the C power supply unit.

(Ninth Embodiment) FIG. 10 is a configuration block diagram according to a ninth embodiment of the present invention. In the figure, an AC power supply is connected to a full-wave rectifier circuit DB50 via a noise filter NF to perform full-wave rectification, and the full-wave rectified component is supplied via a backflow prevention diode D50 to a low-current inductor L50, a smoothing capacitor C50, Diode D5
1, D52, and a partial smoothing circuit composed of an inductor L51 inserted as an impedance element thereto. The smoothed output is supplied to the above-described switching regulator of the push-pull inverter type, and turns on the illumination lamp LAMP.

In the state where the full-wave rectified portion is supplied to the inverter via the partial smoothing circuit, no current flows through the diode D53 only during the discontinuous period of the current component of the full-wave rectification. Does not generate a positive voltage required to turn on the transistor Tr51. Therefore, the transistor Tr51 using the voltage between the diode D53 as the base-emitter voltage.
Is turned off and the transistor Tr50 is turned on to load the resistor R50, so that a current having a waveform close to a sine wave is supplied from the AC power supply. Thus, A
During the discontinuous period when the harmonic component of the C power supply current occurs, the resistance R
By passing a current through 50, harmonic components can be drastically reduced.

The forward voltage of the diode D53 used here needs to be higher than the VBE voltage for turning on the transistor Tr51. If necessary, a resistor for limiting current is connected to the base of the transistor Tr51. I do.

The transistor Tr50 has a MOS-F
FIG. 11 shows a configuration block diagram when the ET is used.
In FIG. 11, during the discontinuous period of the AC power supply current, the transistor Tr21 is turned off by the low voltage of the diode D24, the MOS-FET Tr20 is turned on, and the load resistance R20 is turned on.
The load current is supplied during the discontinuous period, and the harmonic component can be drastically reduced. Here, the resistor R23 is a bias resistor, and the Zener diode D23 is a protection diode for preventing an over-gate-source voltage of the MOS-FET Tr20. The other circuit configuration and operation in FIG. 11 are the same as those in FIG.

[0039]

As described above, according to the present invention, a sine-wave voltage and current are supplied from a commercial power supply to a lighting inverter of a load that consumes the sine wave, and a harmonic component generated during a discontinuous period of the current. Is consumed by a resistance load, a load for biasing a semiconductor element, and a load for heating a hot cathode filament such as a hot cathode fluorescent lamp or a hot cathode germicidal lamp, thereby preventing generation of harmonic components as a whole. With such a configuration, it is possible to support not only a specific lighting fixture but also other harmonic suppression products.

[Brief description of the drawings]

FIG. 1 is a configuration according to a first embodiment of the present invention and a circuit diagram of a part thereof.

FIG. 2 is a configuration block diagram according to a second embodiment of the present invention.

FIG. 3 is a specific circuit diagram according to a second embodiment of the present invention.

FIG. 4 is a waveform chart of each part for describing a third embodiment of the present invention.

FIG. 5 is a specific circuit diagram according to a fourth embodiment of the present invention.

FIG. 6 is a specific circuit diagram according to a fifth embodiment of the present invention.

FIG. 7 is a specific circuit diagram according to a sixth embodiment of the present invention.

FIG. 8 is a specific circuit diagram according to a seventh embodiment of the present invention.

FIG. 9 is a specific circuit diagram according to an eighth embodiment of the present invention.

FIG. 10 is a specific circuit diagram according to a ninth embodiment of the present invention.

FIG. 11 is a specific circuit diagram according to another embodiment of the ninth embodiment of the present invention.

FIG. 12 is a circuit block diagram of a conventional lighting device.

[Explanation of symbols]

 D1 Full-wave rectifier circuit R Load resistance CT Current transformer CC Comparison control unit INV Inverter L1, L3 Constant current inductor C3 Smoothing capacitor D4, D5 Diode L4 Inductor T1, T2, T3 Transformer

Claims (4)

[Claims] 1. A lighting device for illuminating an illumination lamp by supplying commercial power to a lighting device, comprising: a full-wave rectifier circuit for full-wave rectifying the commercial power source; a partial smoothing circuit for partially smoothing an output of the full-wave rectifier circuit; An inverter circuit for switching the output of the partial smoothing circuit at a high speed, wherein the partial smoothing circuit detects a discontinuous period of the commercial power supply current and reduces a harmonic component of the commercial power supply to a predetermined level or less. The lighting device supplies the power to a resistive load of the commercial power supply. 2. An illumination device for illuminating a lighting lamp by supplying a commercial power supply through a power supply circuit, wherein an electric power component for lowering a harmonic component of the commercial power supply for illuminating the lighting lamp to a predetermined level or less. A lighting device for supplying a bias for a semiconductor element of the power supply circuit. 3. An illumination device for illuminating a lighting lamp by supplying a commercial power supply through a power supply circuit, wherein an electric power component for illuminating the lighting lamp, the harmonic component of which is lower than a predetermined level. A lighting device, which is supplied to heat a hot cathode of the lighting lamp. 4. A power supply method for supplying a commercial power supply to a non-linear load, wherein a discontinuous portion of a load current supplied from the commercial power supply is detected based on the non-linearity of the load,
During this detection period, the commercial power supply is partially connected to the load,
A power supply method comprising supplying a bias to a hot cathode of a part of the load or a semiconductor of a part of the load.