JPS609366A - Power source circuit - Google Patents

Abstract

PURPOSE:To reduce the distortion of the output by rectifying and smoothing one of the outputs of two secondary windings of a power transformer, and then adding it with other output. CONSTITUTION:The voltage of a commercial power source is applied to the primary winding of a transformer 1, the output of the secondary winding 3 is rectified by a diode 5 and applied to a smoothing condenser 7. The output of the other secondary winding 4 of the transformer 1 is rectified by a diode 21, smoothed by a condenser 23, and applied through a diode 25 to the condenser 7. The positive polarity terminal voltage of the condenser 7 is supplied as an output to a signal amplifier 31.

Description

[Detailed Description of the Invention] Technique C) The present invention is directed to the innoturf 1 chair, which is caused by the mutual interference between the signal current and the smoothing lysosol current.
(1) - Low occurrence of modulation distortion (3) Relates to the circuit.

Background technology Conventionally, commercial Ichihara is rectified and smoothed to produce DC heavy duty? For amplifiers, etc. that use a power supply circuit that operates as
i°1 River: l/Denza was heading north on the outbound route of Ripple Current and I1r 5J City River. In order to reduce voltage fluctuations and tmi in the power supply circuit, increase the capacitance 1,1 of the smoothing capacitor and reduce its internal resistance.
The waveform of the lithosol current, that is, the charging current, becomes sharper, and due to mutual interference with the signal current, there is a drawback that the distortion increases due to innoturf, isometric hum modulation (hereinafter abbreviated as "111M").

DISCLOSURE OF THE INVENTION In order to avoid reducing 111M distortion, the present invention connects the rectified output of other systems to a first smoothing capacitor that smooths the output of the power supply system or the sending output that has been rectified by the first rectifier. It is also something to apply. That is, as the 118 output of the other system, the voltage obtained by adding in series the output of the AC voltage generator that generates a voltage having a predetermined voltage value and in phase with the output of the power transformer to the output of the power transformer is added to the second output. The voltage is rectified by a rectifier and smoothed by a second 1'-Namekawa capacitor, and this smoothed voltage is passed through a third rectifier to be used as a rectified output for another system and applied to the first smoothing capacitor. It is.

Since the present invention achieves t11If as described above, even if the internal resistance of the power supply circuit is reduced in order to reduce the voltage fluctuation rate, the ripple current amplitude value of the smoothing capacitor does not increase and the waveform is not sharp. therefore,
111M distortion due to mutual interference with the signal current is significantly reduced compared to conventional devices.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. Referring to the circuit diagram of the power supply circuit of the first embodiment of the present invention in FIG. 1 and the voltage and current waveform diagrams of each part in FIG. 1 in FIGS. input terminal 10
1.10:l is connected to the primary winding heel 2 of the power transformer 1, and its secondary winding 3 is the first rectifier.
15 anode and ground. The cathode of Gui A-)'5 is connected by 1 g to the positive terminal of the first smoothing capacitor 7 whose load terminal is connected to ground. /1 is an alternating current voltage generating section, which is composed of an iron core around which the primary and secondary sides of the electric transformer 1 are wound, and a tertiary side winding gland 4.

The output voltage of the tertiary winding 4 was rectified by a diode 21 and smoothed by a smoothing capacitor 23 (14
,, the value is set to be approximately equal to or slightly smaller than the forward voltage drop value of the diode 25, 1-1. One end of the tertiary winding 4 is connected to the secondary side 8 of the power transformer l.
Ii! It is connected so that it is added to the output of No. 3 in the same phase. The other end of the tertiary winding heel 4 is connected to the anode of a diode 2I, which is a second rectifier, and its cup is connected to the positive terminal of a second smoothing capacitor 23. The load terminal of the =+/denza 23 is connected to the ground, and its positive terminal is connected to the anode of a diode 25, which is a third rectifier, and its cathode is connected to the smoothing capacitor 7. Connected to the positive polarity terminal. There is a load between this positive terminal and the ground (
A jj amplifying section 31 is connected.

Next, the operation will be explained. When a commercial power supply voltage is applied to the input terminals 101 and +03, that voltage is applied to the primary coil gland 2 of the power transformer 1, and as a result, it is induced in the secondary coil gland 3 and the tertiary coil gland 4. The voltages obtained are added and shown in Figure 2 (
The voltage becomes the voltage shown in (a), is rectified by passing from the anode to the cathode of the diode 21, and is applied to the positive terminal of the smoothing capacitor 23. The voltage 11 at the positive terminal becomes the voltage shown in (0) in FIG.
The maximum voltage value is the value obtained by subtracting the forward direction drop voltage value of the die λ-de 21 from the maximum voltage value shown in FIG. 732 (a). Then, from the positive terminal to the negative terminal of the smoothing condenser 23, the time, writing, t2 and [4.112 and +14,
The charging current shown in (c) of FIG. 2 flows during the period -.... These periods are when the voltage applied to the anode of the diode 21 shown in (a) of Figure 2 exceeds the voltage of the positive terminal of the smoothing capacitor 2 (shown in (0) of Figure 2). On the other hand, the voltage shown in (d) in Figure 3 induced in the secondary winding fi!3 of the power transformer 1 is rectified by passing from the anode to the cathode of the diode 5.・It is applied to the positive polarity terminal of s° 7. If the charging current waveform diagram of the 21st direction/za 7 for the first and second slides is shown, it will be as shown in (f) of Fig. , [3
During the periods of [5, +13 and +15, . . . ], the voltage shown in (d) in FIG. PII
II, the voltage is higher than the voltage shown in (e) of FIG. 3, and a charging current shown in (f) of FIG. Here, Kolf°)
III:+The voltage waveform diagram of the positive terminal of the power converter 7 is as shown in (e) in Figure 3.11) Incoming power 1
, , l-6'i is the value obtained by subtracting the forward voltage drop value of the die 5 from the maximum voltage value (d) in FIG.

If the positive terminal r voltage of the smoothing capacitor 7 is less than the value obtained by subtracting the forward drop voltage value of the diode 25 from the terminal voltage of the capacitor 23, the third A predetermined current io is applied to the smoothing capacitor at one point during the periods T4 and T14, Φ, etc., which are not shown in (f) of the figure. Then, the positive terminal voltage of the smoothing capacitor 7 changes from the voltage waveform shown in (:)) in Fig. 2 to the voltage waveform shown in 1;) in Fig. 3, and the amplitude value of the ripple voltage waveform decreases. .

Therefore, the maximum value of the ripple current flowing through the smoothing capacitor 7 is approximately half that of the conventional one, and even if the signal current flows through the smoothing capacitor 7 from the signal amplifying section 31, 111M distortion due to mutual interference with the ripple current is reduced. do.

Next, another embodiment will be described with reference to FIG.

Reference numeral 27 denotes an impedance having a predetermined value, which is composed of a resistor, a coil, or the like, and is connected between the cathode of the diode 25, which is the third rectifier, and the positive terminal of the first smoothing J7 diode 7. The circuit configuration of other parts is the same as that of the first embodiment. To explain the operation, even if the impedance of the signal amplifying section 31 changes and the negative current flowing into the signal amplifying section II fluctuates, the smoothing;
(The current io shown in FIG. 3 flowing into the smoothing capacitor 7 via the diode 25 fluctuates more slowly, and an increase in IIIM distortion can be prevented.

Also, the tertiary winding Ii of the power transformer l! Adjustment of the voltage (/f) generated by 4 is easier than in the circuit shown in FIG.

As mentioned above, in the present invention, even if a large-capacity smoothing capacitor is used to reduce the voltage fluctuation rate of the power supply circuit,
This has the effect of not increasing IIIM distortion in signal components.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of the circuit of the first embodiment of the present invention, FIG. 2 and FIG. 3 are voltage and current waveform diagrams of various parts in FIG. 1 is a circuit diagram of a power supply circuit of another embodiment. 1...Power transformer, 4...AC 1:L electric power generator, 5 life...first rectifier, 7...-〇first 2; 1... Second smoothing code/denser, 25-II11 Third rectifier.

Claims (1)

[Claims] The output of the electric current system/system is supplied to a first rectifier, and the output thereof is connected to a first rectifier connected in parallel with a negative A::1.
At 1 time i1'f a second rectifier connected to the output of the voltage generator, and a second rectifier for flattening the output of the second rectifier;
Connect one end to the connection point of this second smoothing code and the second adjustment in +'+ii; 1st u; i') Ill :'7°/° and 11
The 33rd 1! connected to the connection point of the 1f register! :*Electronic bath characterized by being equipped with a sink; ;1"l W+'
r.