JPH08126322A - Dc power supply - Google Patents

Abstract

PURPOSE: To remove harmonic components from the electric current in the AC power supply terminal of a DC power supply which rectifies an AC voltage by using a capacitor and, at the same time, to improve the power factor of the power unit. CONSTITUTION: A smoothing capacitor C1 is charged to an AC voltage rectified by means of a first rectifier circuit. A reverse current blocking diode Da is connected between the capacitor C1 and a DC output terminal 7. The AC voltage is rectified by means of a second rectifier circuit. A boosted bias voltage 10 is connected between the second rectifier circuit and the DC output terminal 7. A bias current flows through an AC power supply terminal in addition to a pulse current which charges the capacitor C1. Therefore, harmonic components can be reduced from input currents and, at the same time, the power factor of a DC power unit can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power supply device suitable as a power supply for office automation equipment and the like. More specifically, it can obtain a relatively long power failure guarantee time and improve the input power factor. DC power supply device

[0002]

2. Description of the Related Art A power supply device for an electronic device connected to a commercial AC power supply comprises a rectifier, a smoothing capacitor and a switching regulator circuit. The smoothing capacitor in this type of power supply device functions not only as a smoothing function but also as a power supply for guaranteeing a power failure.

[0003]

When the capacity of the smoothing capacitor is increased, the power failure guarantee time becomes longer, but the power factor on the input side of the rectifier deteriorates. That is, in this case, the ripple of the voltage of the smoothing capacitor becomes small, the current of the capacitor flows only near the peak value of the sine wave AC voltage, the harmonic component of the input current increases, and the power factor deteriorates. This kind of problem can be solved to some extent by reducing the capacity of the smoothing capacitor, but the power failure guarantee time is shortened.

Therefore, an object of the present invention is to provide a DC power supply device which can obtain a relatively long power failure guarantee time and can improve the input power factor.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is directed to an AC power supply terminal and includes first and second
A rectification circuit having a rectification output terminal and a common terminal of
A smoothing capacitor connected between the first rectifying output terminal and the common terminal; a backflow blocking diode connected between the smoothing capacitor and a DC output terminal;
The present invention relates to a DC power supply device including a step-up DC bias power supply connected between the second rectification output terminal and the DC output terminal. In addition, as shown in claim 2,
The bias power supply can include control means. Also,
As described in claim 3, it is desirable that the load is a switching regulator circuit and the bias power supply is also used as an output transformer of the switching regulator circuit. Further, as described in claim 4, a bias power source can be connected to one and the other output terminals of the rectifier circuit, respectively. Further, as described in claim 5, a voltage doubler rectifier circuit can be used.

[0006]

According to the invention of each claim, in addition to the charging current of the capacitor, a current flowing through the bias power supply flows. Since the above two combined currents flow through the AC power supply terminal, the current has less harmonic components than the conventional case where only the capacitor charging current is used, and the power factor is also improved. By controlling the output voltage as described in claim 2, it is possible to prevent an excessive voltage from being applied to the load. Moreover, the peak of the input AC current becomes small. When the bias power source is configured so as to also serve as the output transformer as described in claim 3, the bias voltage can be easily obtained. Claim 4
According to the above, since two bias power supplies are provided, the voltage of each bias power supply can be lowered. According to claim 5, a high voltage can be easily obtained.

[0007]

[First Embodiment] Next, a first embodiment of the present invention will be described with reference to FIGS. In the DC power supply device shown in FIG. 1, a rectification circuit 6 having a first rectification output line 3, a second rectification output line 4 and a common line (ground line) 5 is connected to the commercial AC power supply terminals 1 and 2. ing. The rectifier circuit 6 includes the first to fourth diodes D.
It comprises a bridge circuit of 1 to D4 and fifth and sixth diodes D5 and D6 added thereto. The anodes of the fifth and sixth diodes D5, D6 are AC power supply terminals 1, 2
It is connected to the. Therefore, the fifth and sixth diodes D5 and D6 also function as the third and fourth diodes D3 and D4 to form a bridge rectification circuit. The first rectified output line 3 as the first rectified output terminal has the first and second rectified output lines 3.
Connected to the cathodes of the diodes D1 and D2, and the second rectified output line 4 as the second rectified output terminal is connected to the cathodes of the fifth and sixth diodes D5 and D6,
The common line 5 as a common terminal is connected to the anodes of the third and fourth diodes D3 and D4.

The smoothing capacitor C1 is connected between the first rectified output line 3 and the common line 5. One end of this smoothing capacitor C1 has a backflow prevention diode Da.
Is connected to the DC output terminal 7 via. The other end of the smoothing capacitor C1 is connected to the ground terminal 8.
A load 9 is connected between the pair of terminals 7 and 8. Second
A bias power supply 10 is connected between the rectified output line 4 and the DC output terminal 7. This bias power supply 10
Is an auxiliary power supply for supplying a DC voltage lower than the maximum charging voltage of the capacitor C1.

As is clear from FIG. 2 which shows the waveforms of the respective parts of FIG. 1, when the AC voltage Vac shown in FIG. 2A is applied to the AC power supply terminals 1 and 2, the capacitor C1 from the first rectified output line 3 is applied. As shown in FIG. 2D, the pulsed current I
a flows. In addition, the second rectified output line 4 has a structure shown in FIG.
As shown in (C), a square-wave current I having a substantially constant amplitude is obtained.
b flows. This current Ib flows for a longer time than the pulsed current Ia. Current Iac at AC power supply terminals 1 and 2
2 is the sum of the current Ia of the first rectified output line 3 and the current Ib of the second rectified output line 4, the waveform becomes as shown in FIG. The waveform of this current Iac is not a sine wave, but the harmonic component is smaller than that of the case of only the charging current Ia of the capacitor C1 shown in FIG. 2D because of the addition of the current Ib of the second rectified output line 4. , The input power factor also improves.

FIG. 2B shows the relationship between the voltages of the respective parts. As is clear from this relationship, the voltage Va of the capacitor C1
During the period t1 to t4 when the output voltage Vc is higher than the output voltage Vc, the diode Da is reverse biased, and the capacitor C1 loads the load 9
Does not supply power to. During this period t1 to t4, the voltage Vb + V10 obtained by adding the voltage V10 of the bias power source 10 to the rectified output voltage Vb obtained between the second rectified output line 4 and the common line 5 is applied to the load 9, The square wave current Ib shown in 2 (C) flows. Since the amplitude of the sine wave AC voltage is small, during the period t0 to t1 and t4 to t5 where Vb + V10 is lower than the voltage Va of the capacitor C1, the diode Da
Is turned on, and power is supplied to the load 9 from the capacitor C1.

In this DC power supply device, an AC power supply terminal 1,
When the power supply from 2 is stopped, the input power factor does not deteriorate much even if the time for supplying power from the capacitor C1 to the load 9 (power guarantee time) is lengthened. That is, even if the capacity of the capacitor C1 is increased in order to lengthen the power failure guarantee time, the load 9 is not supplied with power only via this capacitor C1 and the second rectified output line 4 and the bias power supply 10 are connected. Since the power is supplied via the power factor, the power factor is not determined only by the waveform of FIG. 2D, but is determined by the combination of the waveform of FIG. 2C and the waveform of FIG. Become.

[0012]

[Second Embodiment] Next, a DC power supply device according to a second embodiment will be described with reference to FIG. However, in FIG. 3 and the drawings showing other embodiments to be described later, substantially the same parts as those in FIG. 2 and the drawings showing the other embodiments are denoted by the same reference numerals and the description thereof will be omitted. In FIG. 3, a switching regulator circuit 9a is provided as the load 9 of FIG. The switching regulator circuit 9a is the transformer 1
1 has a primary winding 12 and a series circuit of a switch Q1 composed of a field effect transistor. This series circuit has a line 7a corresponding to the output terminal 7 and the ground terminal 8 of FIG.
It is connected between 8a. Secondary winding 1 of transformer 11
A rectifying / smoothing circuit including a diode 14 and a capacitor 15 is connected to 3. A load 18 is connected to the output terminals 16 and 17 of this rectifying / smoothing circuit. The control circuit connected to the control terminal (gate) of the switch Q1 has a frequency (for example, 20 kHz) which is sufficiently higher than the frequency (for example, 50 Hz) of the AC voltage of the AC power supply terminals 1 and 2.
Generates a PWM pulse to control ON / OFF of 1. Since this control circuit 19 is connected to the output terminal 16, it forms a PWM pulse for keeping the output voltage constant by a known method.

The bias power supply 10 of FIG. 3 having the same function as the bias power supply 10 of FIG. 1 comprises a bias power supply capacitor 20, a winding 21 for charging the same, and a diode 22. The bias power supply capacitor 20 is connected between the second rectified output line 4 and the cathode side line 7a of the diode Da. The bias power supply winding 21 is electromagnetically coupled to the primary and secondary windings 12 and 13 of the transformer 11. Primary windings 12 and 2 of transformer 11
The secondary winding 13 is the diode 1 during the ON period of the switch Q1.
4 is related so as to generate a voltage in the direction of keeping 4 off. In addition, the bias power supply winding (tertiary winding) 21
Has a polarity such that a voltage for turning on the diode 22 is obtained during the ON period of the switch Q1. Therefore, the capacitor 20 is charged by the voltage of the tertiary winding 21 during the ON period of the switch Q1. The diode 22 is connected between the upper end of the capacitor 20 and the upper end of the winding 21 so as not to interfere with the power supply from the smoothing capacitor C1 to the switching regulator 9a.

The DC power supply device of FIG. 3 has substantially the same structure as that of FIG. 1, and therefore has the same effects as those of FIG. Further, since the bias power supply 10a is also configured to serve as the transformer 11 of the switching regulator circuit 9a, the cost of the bias power supply 10a can be reduced.

[0015]

[Third Embodiment] The DC power supply device of the third embodiment shown in FIG. 4 has the same configuration as that of FIG. 3 except that a reactor Lx and a high frequency capacitor Ck are added to the circuit of FIG. The reactor Lx is connected to the diode 22 in series. This reactor Lx has a smoothing function for charging the capacitor 20. The capacitor Ck has a capacitance significantly smaller than that of the capacitor C1 and has a diode Da.
Is connected between the cathode and the ground line 8a and has a bypass function for high frequency components. Since the circuit of FIG. 4 has the same main part as the circuit of FIG. 3, it has the same effects as the circuit of FIG. That is, the waveform diagram of each part in FIG. 4 is as shown in FIG. 45, and the waveform improving effect and the power factor improving effect are larger than those in the first embodiment. As will be described later, the reactors Lx or Lx1 and Lx2 are provided in FIGS.
In the circuits such as 22, 23, 24, 27, 29, 30, 31, 32, etc., the waveform improving effect shown in FIG. 45 can be obtained as in FIG. In FIGS. 3 and 4, the polarity of the winding wire 21 is reversed from that of FIGS. 3 and 4, or instead of providing the winding wire 21, a tap is provided on the winding wire 12, and the tap is used to charge the capacitor 20. can do.

[0016]

[Fourth Embodiment] A DC power supply device according to a fourth embodiment shown in FIG. 5 has a diode 1 on the secondary side during the ON period of a switch Q1.
4 is configured as a forward type converter so that it is turned on. Therefore, the secondary and tertiary windings 13 and 21
The polarity of is opposite to that in FIG. Further, a reactor L0 and a diode D0 for forming a smoothing circuit are added to the secondary side. Reactor L0 is diode 1
4 and the output terminal 16 are connected in series, and the diode D0 is connected in parallel to the capacitor 15 via the reactor L0. In the circuit of FIG. 5, a voltage for charging the capacitor 20 is obtained in the winding 21 during the ON period of the switch Q1. Since the main part of the circuit shown in FIG. 5 is the same as that shown in FIGS. 3 and 4, it has the same operation and effect.

[0017]

[Fifth Embodiment] A DC power supply apparatus according to a fifth embodiment shown in FIG.
And the reactor Lx are omitted, and the structure is the same as that of FIG. Therefore, in FIG. 5, the bias power supply 10 is composed of only the tertiary winding 21. Since a square wave voltage is obtained at the tertiary winding 21, this is the second rectified output line 4
Is added to the rectified voltage of. Since the circuit of FIG. 6 has the same main parts as those of FIGS. 1 and 3 to 5, it has the same effects as those of these circuits.

[0018]

[Sixth Embodiment] A DC power supply apparatus according to a sixth embodiment shown in FIG. 7 is obtained by adding a reactor Lx to the circuit shown in FIG. When the reactor Lx is connected in series with the winding 21, a smoothing action occurs, and the current of the second rectified output line 4 corresponding to the current Ib shown in FIG. The components are reduced and the power factor is improved. Since the circuit of FIG. 7 has the same main structure as FIG. 5,
It has the same effect as that of FIG.

[0019]

[Seventh Embodiment] In the DC power supply device of the seventh embodiment of FIG. 8, the bias power supply 10 of FIG. 5 is a voltage doubler circuit. That is, in FIG. 8, the bias power supply 10 has windings 21 and 2
One capacitor 20a, 20b and two diode 22
a, 22b and the reactor Lx. The capacitor 20a includes the second rectified output line 4 and the primary winding 12
And a series circuit of two diodes 22a and 22b and a reactor Lx is connected in parallel to the capacitor 20a, and a series circuit of the capacitor 20b and the winding 21 is connected through the diode 22a and the reactor Lx to the capacitor 2a.
0a is connected in parallel. In the circuit of FIG. 8, the voltage of the capacitor 20a acts as a bias voltage. The circuit of FIG. 8 has the same configuration as that of FIG. 5 except for the bias power supply 10, and thus has the same effect as that of FIG.

[0020]

[Eighth Embodiment] A DC power supply apparatus according to an eighth embodiment shown in FIG. 9 is a modification of the bias power supply 10 shown in FIG.
It has the same configuration as. In FIG. 9, the bias power supply device 10 includes a capacitor 20 and two diodes 2
2a, 22b and reactor Lx. The capacitor 20 is connected between the second rectified output line 4 and the upper end line 7a of the primary winding 12. This capacitor 20
In order to charge the battery so that the lower end becomes positive as shown in FIG. 9, the diode 22a is provided between the upper end of the capacitor 20 and the intermediate tap 23 of the primary winding 12 via the reactor Lx.
Is connected, and the capacitor 2 is connected via the reactor Lx.
A diode 22b is connected in parallel with 0.

The capacitor 20 as a bias power source is charged by the voltage of the portion 12a above the center tap 23 of the primary winding 12 during the ON period of the switch Q1. That is, a charging current flows through the closed circuit of the portion 12a on the winding 12, the capacitor 20, the reactor Lx, and the diode 22a during the ON period of the switch Q1, and the reactor Lx discharges the stored energy during the OFF period of the switch Q1. Lx, diode 22b and capacitor 2
A current flows in a closed circuit of zero. Since the function of the bias power source 10 of FIG. 9 is the same as that of the first to seventh embodiments, the device of FIG. 9 has the same effects as the first to seventh embodiments. It should be noted that the polarity of the secondary winding 13 in FIG. 9 is reversed to form a reverse converter, and the reactors Lo, Lx, the diode D0,
22b can be omitted. Also, the high frequency capacitor C
k can be omitted.

[0022]

[Ninth Embodiment] A DC power supply device according to a ninth embodiment shown in FIG. 10 has the same structure as that of FIG. 5 except that the bias power supply 10 is a variable bias power supply. That is, the capacitor 20
Capacitor 20 and diode 2 to adjust the voltage of
A series circuit of a transistor 24 and a diode 25 is connected in parallel with the line 2. The base of the transistor 24 is connected to the control circuit 26, the transistor 24 is intermittently controlled in response to a control signal from the control circuit 26, and the capacitor 2
Zero charge is controlled. The charge control of the capacitor 20 is performed only during the period when the voltage Vc between the cathode of the diode Da and the ground line 8a becomes higher than the voltage Va between the anode of the diode Da and the ground line 8a. Therefore, the voltages Va and Vc are input to the control circuit 26 and the two are compared. As shown in FIG. 11B, t1
When the voltage Vc becomes Va or higher in the range from t2 to t3 to t4, the control operation of the transistor 24 by the control circuit 26 starts.
The transistor 24 is controlled so that the reference voltage Vr is slightly higher than Va. The voltage of the capacitor 20 is shown in FIG.
The output voltage Vc is controlled to be low near the peak of the input voltage Vac shown in 1 (A), and the output voltage Vc is prevented from becoming high in response to the voltage of the second rectified output line 4 increasing with a sine wave. It As a result, an unnecessarily high voltage is not applied to the converter circuit. Further, the maximum value of the current Ib of the second rectified output line 4 is limited, and the state becomes equivalent to that the current Ib of FIG.
The maximum value of ac also becomes smaller. The resistance of the transistor 24 may be changed to control the charging of the capacitor 20. Since the main part of the circuit of FIG. 10 is the same as that of FIG. 5, the same effect as that of FIG. 5 can be obtained.

[0023]

[Tenth Embodiment] The direct-current power supply device of the tenth embodiment of FIG. 12 has the same configuration as that of FIG. 5 except for the circuit for controlling the charging voltage of the capacitor 20. In FIG. 12, winding 21
The transistor 24 is connected in series between the capacitor 20 and the capacitor 20 via the reactor Lx, and the diode 25 is connected in parallel to the capacitor 20 via the reactor Lx. That is, the charging current of the capacitor 20 is controlled by the series chopper method. The control circuit 26 is formed similarly to FIG. 10, and controls the output voltage Vc to a constant value only during the off period of the diode Da. The off period of the diode Da can be detected, for example, by connecting the emitter of the PNP transistor to the cathode of the diode Da and the base to the anode. Note that FIG. 10 and FIG.
In the above, the resistance value can be controlled so as not to cause the transistor 24 to perform the chopper operation (intermittent operation). Since the circuit of FIG. 12 is essentially the same as the circuit of FIG. 10, it has the same effect.

[0024]

[Eleventh Embodiment] The DC power supply device according to the eleventh embodiment of FIG. 13 has an output voltage V during the off period of the diode Da.
It is configured to switch c in a stepwise manner. That is, the first and second bias power supply capacitors 20 a and 20 b are connected between the second rectified output line 4 and the primary winding 12 via the switch 27. The second rectified output line 4 is connected to the midpoint of connection between the two capacitors 20a and 20b via a diode 28 that functions as a switch. The upper end of the first capacitor 20a is connected to the first tap 23a of the primary winding 12 via the diode 22a.
The upper end of the second capacitor 20b is connected to the second tap 23b of the primary winding 12 via the diode 22b.

In FIG. 13, tap 2 of primary winding 12
Capacitors 20b and 20a are charged in the circuit above 3a, capacitors 20a and 20b and diode 22a, and capacitors above the tap 23b of primary winding 12 and the circuit of capacitor 20b and diode 22b. 20b is charged. The diode 22b
It is also possible to omit the charging circuit by. The switch 27 is turned on only during the on period of the backflow prevention diode Da and a part of the on period. FIG. 14 shows the ON period of the switch 27 and the output voltage Vc. In the range of 0 ° to 360 °,
The diode Da is t1 to t2, t3 as in FIG.
The switch 27 is turned off at t4, and the switch 27 is set to ta from 0 degree.
, From tb to tc and from td to 360 degrees. When the switch 27 is on, the sum of the voltages of the two capacitors 20a and 20b acts as a bias voltage. Period ta to t including the peak of AC sine wave voltage
When the switch 27 is turned off at b, tc to td,
Due to the circuit of the diode 28 and the capacitor 20b, the voltage of the capacitor 20b becomes a bias voltage, and the output voltage Vc decreases as shown in FIG. Therefore, the device shown in FIG. 13 can also obtain the same effects as those of the devices shown in FIGS.

[0026]

[Twelfth Embodiment] The DC power supply device of the twelfth embodiment shown in FIG. 15 is different from the circuit of FIG. 3 only in the internal configuration of a switching regulator circuit 9a as a load and the internal configuration of a bias power supply 10. Has the same configuration as in FIG. In FIG. 15, the switching regulator circuit 9a as a load is configured by using a half bridge type inverter. That is, the series circuit of the first and second switches Q1 and Q2 and the series circuit of the first and second capacitors 31 and 32 are connected between the DC output line 7a from which the output voltage Vc is obtained and the ground line 8a. The primary winding 12 of the transformer 11 is connected between these connecting midpoints.
Is connected. The secondary winding 13 of the transformer 11 has a center tap and is connected to the smoothing capacitor 15 via two diodes 14a and 14b. The control circuit 19a connected to the control terminals of the first and second switches Q1 and Q2 alternately turns on and off the first and second switches Q1 and Q2 at a frequency sufficiently higher than the AC power supply voltage Vac. Generates the control signal of.

The bias power supply 10 of FIG. 15 has a tertiary winding 21 having a center tap and diodes 22a and 22b for rectifying the voltage induced therein and charging the capacitor 20.
Have and. Capacitor 2 that functions as a bias power supply
0 is connected between the second rectified output line 4 and the DC output line 7a.

Since the voltage Vc applied to the half-bridge type switching regulator 9a in FIG. 15 is substantially the same as that in FIG. 3, the same effect as that in FIG. 3 can be obtained. In FIG. 15, the bias power source 1
The configuration of 0 can be variously modified according to the techniques of FIGS. 4, 7, 8, 10, 12, and 13 and the like.

[0029]

[Thirteenth Embodiment] In the DC power supply device of the thirteenth embodiment of FIG. 16, the cathode side of the diodes D3 and D4 is the common line 5, and the anode side of the diodes D1 and D2 is the first rectified output line 3. , The anode side of the diodes D5 and D6 is used as the second rectified output line 4, the backflow prevention diode Da is connected between the lower end of the capacitor C1 and the lower end of the switch Q1, and the capacitor 20 is connected to the second rectified output line 4. And the lower end of the switch Q1. Further, in FIG. 16, the charging power source of the capacitor 20 is a winding 21 electromagnetically coupled to the smoothing reactor L0 on the secondary side, which is connected to the capacitor 20 via a diode 22. Even if formed as shown in FIG. 16, the function of the bias capacitor 20 is the same as that of FIG. 3, and the same effect as that of FIG. 3 can be obtained. Note that, in FIG. 16, the charging winding 21 of the capacitor 20 may be coupled to the transformer 11. Further, the bias power source 10 of FIG. 16 can be modified as shown in FIGS. 4, 6 to 10, 12, and 13.

[0030]

[Fourteenth Embodiment] A switching regulator circuit 9a of a DC power supply device according to a fourteenth embodiment of FIG. 17 has the same structure as that of FIG. 17 is different from FIG. 15 in that the bias power supply capacitor 20 is moved to the lower side of the switches Q1 and Q2 as in FIG. 16, and the diode D5 and
D6 is also connected in the same manner as in FIG. FIG.
In FIG. 7, the charging power source for the capacitor 20 is the tertiary winding 21 of the transformer 11. The embodiment of FIG. 17 is basically the same as the first to thirteenth embodiments, and therefore has the same effects.

[0031]

[Fifteenth Embodiment] A direct-current power supply device according to a fifteenth embodiment of FIG. 18 is obtained by adding a switch Q2 to the circuit of FIG. Switch Q2 is connected between line 5 and primary winding 12. The two switches Q1 and Q2 are turned on / off at the same time in response to a control signal similar to that shown in FIG. 16 provided from a control circuit (not shown). Two switches Q1,
Since Q2 is connected in series with each other, the applied voltage when OFF is half that in the case of FIG. Others are the same as those in FIG. 16, and thus have the same effects. Note that FIG.
4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG.
Also in FIGS. 1 and 12, a switch Q2 can be added as in the case of FIG.

[0032]

[Sixteenth Embodiment] A DC power supply apparatus according to a sixteenth embodiment of FIG. 19 is obtained by adding a transistor 24 for controlling charging of the capacitor 20 and a control circuit 26 to the circuit of FIG.
In FIG. 19, the diode 22 is connected between the lower end of the winding 21 and the lower end of the capacitor 20, and the transistor 24 is connected between the lower end of the winding 21 and the ground line 8a. The transistor 24 of FIG. 19 and this control circuit 26
Has substantially the same operation as that shown in FIG. That is, charging of the capacitor 20 is controlled in the same manner as in FIG. 10 by bypassing the charging current supplied from the winding wire 21 to the capacitor 20 to the transistor 24. Therefore, the embodiment of FIG. 19 has the same effect as that of FIG.

[0033]

[Seventeenth Embodiment] A DC power supply device according to a seventeenth embodiment shown in FIG. 20 is obtained by partially modifying FIG. That is, in FIG. 20, the capacitor 20 is connected between the tap 23 of the primary winding 12 and the second rectified output line 4, and the charging diode 22 is connected to the left end of the capacitor 20 and the primary winding 12.
Is connected between the top and. In this case, the capacitor 20 has a portion 12a above the tap 23 of the primary winding 12.
Is charged with the voltage obtained during the off period of the switch Q1. Since this embodiment is basically the same as that of FIG. 3, it has the same effect. The switching regulator circuit 9a in FIG. 20 can be modified into a forward type as in FIG.

[0034]

[Eighteenth Embodiment] The direct-current power supply device of the eighteenth embodiment of FIG. 21 omits the capacitor 31 of FIG. 15 and puts a series circuit of the primary winding 12 and the capacitor 32 in parallel with the second switch Q2. It includes a well-known modified half bridge connected. 21 is the same as FIG. 15 except for this, and therefore has the same operation and effect as FIG. In FIG. 21, a series circuit of the primary winding 12 and the capacitor 32 can be connected in parallel with the first switch Q1.

[0035]

[Nineteenth Embodiment] The direct-current power supply device of the nineteenth embodiment of FIG. 22 has the same structure as that of FIG. 21 except that the internal structure of the bias power supply 10 of FIG. 21 is modified. In FIG. 22, the center tap of the winding 21 is connected to the lower end of the capacitor 20, and the upper end of the capacitor 20 is connected to the diodes 22a, 2
The winding 21 is connected to both ends of the winding 21 through the reactor 2b and reactors Lx1 and Lx2. The basic configuration of the circuit of FIG. 22 is the same as that of the above-described embodiments, and has the same effects.

[0036]

Twentieth Embodiment The twentieth embodiment of FIG. 23 is a modification of the internal structure of the bias power supply 10 of FIG. In FIG. 23, the diode 22 is connected in parallel with the capacitor 20.
The series circuit of a and 22b is connected, and the diode 22a,
The midpoint of connection of 22b is connected to one end of the winding 21 via the voltage doubler capacitor Cx and the reactor Lx1, and the other end of the winding 21 is connected to the positive terminal of the capacitor 20. When an upward voltage is generated in the winding 21 in this circuit,
The capacitor Cx is charged by the circuit of the winding 21, the reactor Lx, the capacitor Cx, and the diode 22b, and the winding 2
When a downward voltage is generated at 1, the circuit of the winding 21, the capacitor 20, the diode 22a, the capacitor Cx, and the reactor Lx charges the capacitor 20. Even with such a configuration, the basic configuration is the same as that of the above-described embodiments, so that the same operational effect can be obtained. In addition,
In FIG. 23, the capacitor 20 is omitted and the diode D
22a can be modified into a short-circuited structure. Also, the reactor Lx of FIG. 23 can be omitted. Also, instead of the reactor Lx in FIG. 23, a diode D22a
, D22b can be connected in series with the respective reactors.

[0037]

Twenty-first Embodiment A DC power supply device according to a twenty-first embodiment of FIG. 24 is a modification of the charging circuit for the capacitor 20 shown in FIG. In FIG. 24, a bridge circuit of four diodes 22 is provided between the winding 21 and the capacitor 20, the capacitor 20 is connected between the pair of DC output terminals, and the voltage doubler is provided between the pair of AC input terminals. The winding 21 is connected through the capacitor Cx and the reactor Lx. Since the main circuit of FIG. 24 is the same as that of FIG. 22,
It has the same effect as this. Note that the capacitor Cx can be omitted in FIG. Further, in FIG. 24, the reactor Lx can be omitted. Also, FIG.
At the reactor Lx between the capacitor 20 and the diode 22, and between the capacitor 20 and the switch Q1.
You can move to a line that is not in between. Further, two reactors Lx can be connected to each of the two arms of the full-wave rectifier circuit of the diode 22.

[0038]

Twenty-second Embodiment A DC power supply device according to the twenty-second embodiment of FIG. 25 is constructed so that a voltage doubler rectifier circuit can be selectively formed. That is, in FIG. 25, two capacitors C1a and C1b are used instead of the one capacitor C1 in FIG.
Are provided, and these series circuits are connected between the lines 3 and 5. Further, a changeover switch S is provided between the AC power supply terminal 2 and the connection midpoint between the two capacitors C1a and C1b. When the switch S is on, a voltage doubler circuit is formed. In FIG. 25, two bias power supplies 10a and 1
0b is provided, the first bias power source 10a is connected between the diodes D5 and D6 and the output terminal 7, and the second bias power source 10b is connected to the output terminal 8 and the diodes D7 and D8.
Is connected between and. The diodes D7 and D8
Forms a bridge type rectifying circuit together with the diodes D5 and D6. The upper end of the first capacitor C1a and the first
The first backflow blocking diode Da1 is connected to the bias power supply 10a, and the second backflow blocking diode Da2 is connected to the lower end of the second capacitor C1b and the second bias power supply 10b. There is.

In the circuit of FIG. 25, when the switch S is off, the two capacitors C are connected by the diodes D1 to D4.
1a and C1b are charged. In FIG. 25, the output terminal 7,
During the period when the voltage Vc between 8 becomes higher than the sum voltage Va of the two capacitors C1a and C1b, the current Ib flows through the line 4a according to the same principle as the circuit of FIG. This bias current Ib
The path is through the diode D5 or D6, the first bias power source 10a, the load 9, the second bias power source 10b, and the diode D8 or D7. The charging current Ia of the capacitors C1a and C1b flows near the peak of the sinusoidal AC voltage Vac as in the circuit of FIG. The alternating current Iac flowing through the input power supply terminals 1 and 2 is the sum of the two currents Ia and Ib, and the same effects as those in FIGS. 1 and 2 can be obtained.

When the switch S is turned on, the voltage of the capacitors C1a and C1b becomes twice as high as when the switch S is turned off by the operation of the well-known voltage doubler rectifier circuit. At this time, the voltages of the first and second bias power supplies 10a and 10b are also doubled. As a result, the currents Ia and Ib flow as in the case where the switch S is turned off, and the waveform and power factor of the input current Iac are improved. Note that, in FIG. 25, the load 9 is a switching regulator circuit 9a of various formations as in the second to twenty-first embodiments, and the first and second bias power supplies 10a and 10b are the output transformers of the switching regulator circuit 9a. The circuit can also be used for both. Note that in the circuit of FIG. 25, the switch S may be omitted, or the switch S may be omitted and the diode D
2, D4, D6 and D8 can be omitted.

[0041]

Twenty-third Embodiment A DC power supply apparatus according to the twenty-third embodiment of FIG. 26 is a modification of the rectifier circuit 6 of FIG. In FIG. 26, two output lines 3 and 4 and one common line 5 are obtained by adding a diode D9 to the bridge circuit of the diodes D1 to D4. That is, the diode D9 is connected between the cathodes of the diodes D1 and D2 and the capacitor C1, and the output line 3 is connected to the cathode of the diode D9. Bias power supply 10
Is connected between the cathodes of the diodes D1 and D2 and the output terminal 7. 26 is the same as FIG. 1 except for the rectifier circuit 6, so that the same operation and effect as in FIG. 1 can be obtained. The bias power source 10 shown in FIG. 26 can be variously modified as in the second to twenty-second embodiments.

[0042]

[Twenty-fourth Embodiment] A direct-current power supply apparatus according to a twenty-fourth embodiment of FIG. 27 is such that the series circuit of the primary winding 12 and the capacitor 32 in the circuit of FIG. It corresponds to the one that was moved. Others in FIG. 27 are the same as those in FIG. 22, and thus have the same effects. Note that, in FIG. 27, the upper part of the primary winding 12 and the tertiary winding 21 can form a winding of the center tap rectifier circuit. In addition, the reactors Lx1 and Lx in FIG.
x2 can be omitted.

[0043]

[Twenty-fifth Embodiment] A DC power supply device according to a twenty-fifth embodiment shown in FIG. 28 includes a bias power supply capacitor 20 and a primary winding 1
It is connected to 2 taps. Capacitor 20 is 1
The part above the tap of the next winding 12, the capacitor 20, the reactor Lx, and the diode 22 are charged by the closed circuit. Also in FIG. 28, the same effects as those of the above-described embodiments can be obtained.

[0044]

[Twenty-sixth Embodiment] A DC power supply device according to a twenty-sixth embodiment shown in FIG. 29 is configured to charge the capacitor 20 to a double voltage by a voltage of a part of the primary winding 12. In order to enable this double voltage charging, a series circuit of two diodes 22a and 22b is connected in parallel to the capacitor 20, and the midpoint of connection of these diodes 22a and 22b is via a reactor Lx and a double voltage capacitor Cx. Connected to the tap of the primary winding 12. Others are the same as those in FIG. 27, and thus have the same effects. Note that FIG.
The reactor can be omitted in. Also, the reactor Lx can be in series with the diodes 22a and / or 22b.

[0045]

27th Embodiment A 27th embodiment of FIG. 30 is a modification of the bias circuit 10 of FIG. 27, in which a reactor Lx1 and a diode 22 are provided between a line 4 and a switch Q1.
The series circuit of a and the series circuit of the reactor Lx2 and the diode 22b are connected, and the series circuit of the primary winding 21 and the capacitor 20 is connected between the interconnection points of the reactor and the diode of these series circuits. Even with such a configuration, the boosted bias voltage can be supplied, so that the same effect as that of the above-described embodiments can be obtained.
The capacitor 20 in FIG. 30 can be omitted.

[0046]

28th Embodiment The 28th embodiment of FIG. 31 is a modification of the bias power supply 10 of FIG. In FIG. 31, a series circuit of two diodes 22a and 22b is connected in parallel with the capacitor 20 to obtain a voltage doubler, and a reactor Lx is provided between the midpoint of this connection and the tap of the primary winding 12.
A voltage doubler capacitor Cx is connected via. Since the main circuit of FIG. 31 is the same as the above-described embodiments,
The same effect can be obtained. Incidentally, in FIG. 31, the reactor Lx can be omitted, or the reactor Lx can be connected in series to the diodes 22a and / or 22b. Further, the right end of the capacitor Cx can be connected to the upper end of the primary winding 12. In the case of FIG. 31, the diode built in the switch Q1 is the capacitor 20.
However, a separate diode may be connected in parallel with the switch Q1 to form this charging circuit. The charging circuit for the capacitor 20 shown in FIG. 31 can be applied to the circuit shown in FIG. Further, the condenser 20, the diode 22a, the reactor Lx
Can be omitted. The charging circuit for the capacitor 20 shown in FIG. 31 can also be applied to the circuit shown in FIG. In the case of FIG. 5, the right end of the capacitor Cx of FIG.
Or the lower end of the primary winding 12.

[0047]

[29th Embodiment] The 29th embodiment shown in FIG. 32 is shown in FIG.
2 is a modification of the bias power supply 10 of FIG. 2 and includes a series circuit of two diodes 22a and 22b and another series circuit of two diodes 22c and 22d via a reactor Lx between the line 4 and the switch Q1. 22e
And are connected. In addition, the diodes 22a and 22b
A series circuit of the capacitor Cx and the winding 21 is connected between the interconnection point of the capacitor Cx and the interconnection point of the diodes 22c and 22d. Even if the bias power supply 10 is formed as shown in FIG. 32, the main circuit is the same as that of the above-described embodiments, so that the same effect can be obtained.

[0048]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) A circuit for charging the bias power supply capacitor 20 in all the embodiments having the winding 21 can be formed as shown in FIGS. In addition, FIG.
43, the reactor Lx can be omitted, or the reactor Lx can be connected in series with any one or all of the diodes 22, 22a to 22d. Also,
33 to 43, omitting the capacitor 20.
Alternatively, both the capacitor 20 and the reactor Lx can be omitted. In FIG. 37, the bias capacitor is 20
It is divided into two, a and 20b. Since each is charged to the voltage of the winding 21, the two capacitors 20a, 20b
The total voltage of 2 is twice the voltage of the winding 21. (2) Switching regulator circuit 9 shown in FIG.
Instead of one transformer 11 of a, two or more transformers are provided, whose primary windings are connected in series with each other, and
The secondary windings can be connected to each other via diodes. In this case, either or both of the primary windings are used as a power source for charging the capacitor 20, or at least one of the plurality of transformers is provided with a component corresponding to the winding 21 and is used as a power source. You can (3) In the circuits of FIG. 3, FIG. 4, FIG. 5, etc., the diodes D3 and D4 may not be shared by the two rectifying circuits, and another diode for forming a bridge circuit with the diodes D5 and D6 may be provided. (4) A high frequency filter can be connected to the input power supply terminals 1 and 2. (5) The load 9 may be a full bridge type inverter circuit. (6) Instead of coupling the winding 21 of FIG. 16 to the chill coil L0, it may be coupled to the output transformer 11 as shown in FIG. Further, the power supply of the control circuit 19 can be taken from the capacitor 20.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a DC power supply device of a first embodiment.

FIG. 2 is a waveform diagram showing a state of each part of FIG.

FIG. 3 is a circuit diagram showing a DC power supply device of a second embodiment.

FIG. 4 is a circuit diagram showing a DC power supply device according to a third embodiment.

FIG. 5 is a circuit diagram showing a DC power supply device of a fourth embodiment.

FIG. 6 is a circuit diagram showing a DC power supply device of a fifth embodiment.

FIG. 7 is a circuit diagram showing a DC power supply device according to a sixth embodiment.

FIG. 8 is a circuit diagram showing a DC power supply device of a seventh embodiment.

FIG. 9 is a circuit diagram showing a DC power supply device of an eighth embodiment.

FIG. 10 is a circuit diagram showing a DC power supply device of a ninth embodiment.

FIG. 11 is a waveform chart showing a state of each of tenth portions.

FIG. 12 is a circuit diagram showing a DC power supply device of a tenth embodiment.

FIG. 13 is a circuit diagram showing a DC power supply device of an eleventh embodiment.

14 is a waveform diagram showing the output voltage Vc of FIG.

FIG. 15 is a circuit diagram showing a DC power supply device of a twelfth embodiment.

FIG. 16 is a circuit diagram showing a DC power supply device according to a thirteenth embodiment.

FIG. 17 is a circuit diagram showing a DC power supply device of a fourteenth embodiment.

FIG. 18 is a circuit diagram showing a DC power supply device of a fifteenth embodiment.

FIG. 19 is a circuit diagram showing a DC power supply device according to a 16th embodiment.

FIG. 20 is a circuit diagram showing a DC power supply device according to a 17th embodiment.

FIG. 21 is a circuit diagram showing a DC power supply device of the eighteenth embodiment.

FIG. 22 is a circuit diagram showing a DC power supply device of Example 19;

FIG. 23 is a circuit diagram showing a DC power supply device of a twentieth embodiment.

FIG. 24 is a circuit diagram showing a DC power supply device according to a 21st embodiment.

FIG. 25 is a circuit diagram showing a DC power supply device of Example 22.

FIG. 26 is a circuit diagram showing a DC power supply device according to a 23rd embodiment.

FIG. 27 is a circuit diagram showing a DC power supply device according to a 24th embodiment.

FIG. 28 is a circuit diagram showing a DC power supply device according to a 25th embodiment.

FIG. 29 is a circuit diagram showing a DC power supply device according to a 26th embodiment.

FIG. 30 is a circuit diagram showing a DC power supply device according to a 27th embodiment.

FIG. 31 is a circuit diagram showing a DC power supply device of Example 28.

FIG. 32 is a circuit diagram showing a DC power supply device of the 29th embodiment.

FIG. 33 is a circuit diagram showing a bias power supply.

FIG. 34 is a circuit diagram showing another bias power supply.

FIG. 35 is a circuit diagram showing still another bias power supply.

FIG. 36 is a circuit diagram showing still another bias power supply.

FIG. 37 is a circuit diagram showing still another bias power supply.

FIG. 38 is a circuit diagram showing still another bias power supply.

FIG. 39 is a circuit diagram showing still another bias power supply.

FIG. 40 is a circuit diagram showing still another bias power supply.

FIG. 41 is a circuit diagram showing still another bias power supply.

FIG. 42 is a circuit diagram showing still another bias power supply.

FIG. 43 is a circuit diagram showing still another bias power supply.

FIG. 44 is a circuit diagram showing a DC power supply device of a modified example.

FIG. 45 is a view of FIGS. 4, 5, 7, 8, 22, 23, 24, 2;
It is a wave form diagram which shows the state of each part of each DC power supply device of 7, 29, 30 and 32.

[Explanation of symbols]

 6 Rectifier circuit 10 Bias power supply C1 capacitor

Claims (6)

[Claims] 1. A rectifier circuit connected to an AC power supply terminal and having first and second rectified output terminals and a common terminal, and connected between the first rectified output terminal and the common terminal Smoothing capacitor, a reverse current blocking diode connected between the smoothing capacitor and a DC output terminal, and a boosting DC connected between the second rectification output terminal and the DC output terminal. DC power supply consisting of a bias power supply. 2. The bias power supply has a control means for making a voltage between the DC output terminal and the common terminal substantially constant during an off period of the reverse current blocking diode. DC power supply. 3. The load connected between the DC output terminal and the common terminal includes a switch for connecting and disconnecting a DC voltage between the DC output terminal and the common terminal, and a switch for connecting and disconnecting the DC voltage. 3. The DC power supply device according to claim 1, wherein the DC power supply device is a switching regulator circuit including an output transformer for outputting, and the bias power supply is a circuit that also serves as the output transformer to obtain a bias voltage. 4. A first and a second rectifier circuit connected to a pair of AC power supply terminals, and a capacitor connected between one rectified output line and the other rectified output line of the first rectifier circuit. A first backflow blocking diode connected between one terminal of the capacitor and one DC output terminal, and a first backflow blocking diode connected between the other terminal of the capacitor and the other DC output terminal. 2, a reverse current blocking diode, a first DC bias power supply connected between one rectification output terminal of the second rectification circuit and the one DC output terminal, and the other of the second rectification circuit A DC power supply device comprising a second DC bias power supply connected between the rectified output terminal and the other DC output terminal. 5. The capacitor is composed of a series circuit of first and second capacitors, and one of the pair of AC power supply terminals and a connection midpoint of the first and second capacitors for obtaining a voltage doubler. 5. The DC power supply device according to claim 4, further comprising means for connecting fixedly or selectively. 6. A rectifier circuit, which is connected to an AC power supply terminal and has first and second rectified output terminals and a common terminal, and is connected between the first rectified output terminal and the common terminal. A smoothing capacitor, a backflow blocking diode connected between the smoothing capacitor and a DC output terminal, and a primary winding of an output transformer between the DC output terminal and the common terminal. A DC power supply device comprising: a switching regulator circuit including a connected switch; and a boosting DC bias power supply connected between the second rectification output terminal and the tap of the primary winding.