JPH1014231A - Stabilizing power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-power-factor, simple and small-sized stabilizing power unit. SOLUTION: A full-wave rectifying circuit 110 rectifies the full wave of the voltage inputted from an AC power source e, and outputs it. A switch circuit 120 switches the full-wave-rectified output of a full-wave rectifying circuit 110. An output circuit 130 converts the switching output of the switch circuit 120 into DC and outputs it. A controller 140 gives the switch circuit 120 a drive signal, and controls the switch operation, and generates stabilized DC output. An output monitor 170 of the controller 140 monitors the DC output of the output circuit 130 and outputs a monitor signal A. A sinusoidal full-wave generator 150 generates a sinusoidal full-wave form signal B, synchronized with the phase of an AC power source e. The controller 140 uses at least the sinusoidal full-wave form signal B as a control signal C, for generating a drive signal E.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching type stabilized power supply for obtaining a DC output from an AC power supply.

[0002]

2. Description of the Related Art Most general switching power supplies that receive commercial power or the like use a capacitor-input rectifier circuit. In this rectifier circuit, the input current becomes a pulse current that flows only for a very short time every half cycle of the AC input, and contains many harmonic components. For this reason, there is a problem that voltage distortion occurs, which adversely affects the power supply system. In addition, since the reactive power increases, there is a problem that power supply equipment is also adversely affected.

Various power supply devices have been proposed and put into practical use as means for improving the power factor and preventing generation of harmonic current. As one example, an active filter type power supply device is known. The active filter system is employed as a means for improving a power factor in a general forward converter type power supply system in which energy is transmitted to a secondary side while a switch is on. The active filter type power supply device is composed of a forward converter and a boost converter for improving the power factor. It has respective control circuits and controls the input current to be on a sine wave to improve the power factor.

One of the problems of the active filter type power supply device is that two control units are required, which complicates the circuit and meets the demands for miniaturization, weight reduction and cost reduction of the power supply device. The point is not to do so.

Another conventional example is disclosed in Japanese Patent Application Laid-Open No. 4-13850.
No. 6 is disclosed. This power supply has 1
The converter system is adopted, and there is no smoothing circuit after the rectifier diode bridge on the primary side. In this circuit configuration, the sine wave voltage of the commercial power supply and the charging current of the output smoothing capacitor on the secondary side are detected, and based on the detection signal, the primary side of the forward converter is adjusted so that the charging current becomes sine wave shape. Controls on / off of the switch.

However, in this prior art, the AC input current has a rectangular waveform and contains a large amount of harmonic components. Also, since the reference sine wave signal for improving the power factor is created from the AC voltage waveform, a circuit for detecting the AC voltage waveform is required, and a multiplier is required in the control unit. Therefore, the power supply device does not meet the demands for miniaturization, weight reduction, and cost reduction. Further, when distortion or noise occurs in the AC voltage, there is a problem that the influence appears on the reference sine wave signal.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple, small, and stable power supply having a high power factor.

Another object of the present invention is to provide a stabilized power supply device capable of reducing harmonic currents and avoiding various harmonic interference problems.

Still another object of the present invention is to provide a stabilized power supply which does not adversely affect the control operation even if noise or distortion occurs in the power supply voltage.

[0010]

In order to solve the above-described problems, a stabilized power supply according to the present invention includes a full-wave rectifier circuit, a switch circuit, an output circuit, and a control unit.

The full-wave rectifier circuit performs full-wave rectification on a voltage input from an AC power supply and outputs the rectified voltage. The switch circuit switches a full-wave rectified output of the full-wave rectifier circuit. In this circuit configuration, an input smoothing capacitor used in a conventional power supply device is omitted. Therefore,
The circuit configuration is simplified, and it is not necessary to consider the problems that occur when using the capacitor input type rectifier.

The output circuit converts a switching output of the switch circuit into a direct current and outputs the direct current. This allows
A switching-type power supply device that switches an AC power supply and converts the switching output into DC power is obtained.

The control section supplies a drive signal to the switch circuit to control a switch operation, thereby generating a stabilized DC output. By the operation of the control unit, a stabilized DC output can be obtained. The control unit includes an output monitoring unit. The output monitoring unit monitors a DC output of the output circuit and outputs a monitoring signal. Therefore, the monitoring signal of the output monitoring unit is used as a signal for stabilizing the DC output,
DC output can be stabilized.

The control section further includes a full sine wave generation section.
The full sine wave generator generates a full sine waveform signal synchronized with the phase of the AC power supply. The control unit uses at least the sine full-wave waveform signal as a control signal for generating a drive signal to be provided to the switch circuit. According to this configuration, the AC input current is synchronized with the AC input voltage, and the AC input current has a sine wave shape. For this reason,
Harmonic currents are reduced and various harmonic interference problems are eliminated.

Further, since the sine full-wave waveform signal is digitally created, even if noise or distortion occurs in the power supply voltage, the sine full-wave waveform signal is not affected. Therefore, even if noise or distortion occurs in the power supply voltage, the control operation is not adversely affected.

Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The drawings are not intended to be limiting in any way.

[0017]

FIG. 1 is a block diagram of a stabilized power supply according to an embodiment of the present invention. The stabilized power supply according to the present invention includes a full-wave rectifier circuit 110 and a switch circuit 120.
, An output circuit 130, and a control unit 140. In this circuit, an AC power supply e is applied through an input filter circuit 100 to a full-wave rectifier circuit 110 constituted by a rectifier diode bridge.

The full-wave rectifier circuit 110 includes a rectifier diode
It is constituted by a bridge, and performs full-wave rectification on the voltage input from the AC power supply e and outputs the resultant. The switch circuit 120
The full-wave rectification output of the full-wave rectification circuit 110 is switched. The input smoothing capacitor used in the conventional capacitor input type power supply device is omitted. Therefore, the circuit configuration is simplified, and it is not necessary to consider the problems that occur when using the capacitor input type rectifier circuit.

The illustrated switch circuit 120 includes a switch element 122, a main transformer 121, and a main transformer 121.
And a resistor 123 for detecting a pulse current flowing through the primary winding. Therefore, the unsmoothed pulsating voltage is applied to the series circuit of the primary winding of the main transformer 121, the switching element 122, and the resistor 123 as it is. The switch circuit 120 is driven by the drive circuit 160.

The output circuit 130 converts the switching output of the switch circuit 120 into DC and outputs the DC. As a result, a switching type power supply device that switches the AC power supply e and converts the switching output into DC power is obtained. The output circuit 130 shown is a diode 1
31, a diode 132, an inductor 133, and a capacitor 134. The diode 131 is connected such that the anode is in series with one terminal of the secondary winding of the main transformer 121. Diode 132 has its cathode connected to the cathode of diode 131 and connected in parallel with the secondary winding. Inductor (choke coil) 133
Has one end connected to a connection point between the diode 131 and the diode 132. The capacitor 134 is connected in parallel to the secondary winding of the transformer 121 on the output side of the inductor 133. RL is a load.

The control section 140 supplies a drive signal E to the switch circuit 120 to control the switch operation and generate a stabilized DC output. By the operation of the control unit 140, a stabilized DC output can be obtained.

The control section 140 includes an output monitoring section 170. The output monitoring unit 170 monitors the DC output of the output circuit 130 and outputs a monitoring signal A. Therefore, the output monitoring unit 1
By using the monitoring signal A of 70 as a signal for stabilizing the DC output, the DC output can be stabilized. The DC output referred to here includes a DC output voltage, an output current, and an output power.

The controller 140 further includes a full sine wave generator 1
50. The full sine wave generator 150 generates a full sine wave signal B synchronized with the phase of the AC power supply e. Control unit 1
40 uses at least the sinusoidal full-wave waveform signal B as a control signal C for generating the drive signal E. According to this configuration, the AC input current is synchronized with the AC input voltage, and the AC input current has a sine wave shape. For this reason, the harmonic current is reduced, and the problem of various harmonic disturbances is also solved.

As the sine wave generator 150, a commercially available controller, for example, μPD78322 can be used. Such a controller includes a CPU for executing data processing, a ROM for storing programs executed by the CPU and various constants, a RAM for temporarily storing data, and transmitting and receiving data and signals to and from the outside. And an interface for performing each conversion of ADC and DAC, and is one component. Therefore, despite the complicated control operation, the number of circuit elements only needs to be increased substantially by one. This means that a simple and small-sized stabilized power supply device can be realized.

Moreover, since the sinusoidal full-wave waveform signal B is digitally created, even if noise or distortion occurs in the power supply voltage, the sinusoidal full-wave waveform signal B is not affected. Therefore, even if noise or distortion occurs in the power supply voltage, the control operation is not adversely affected.

Next, the configuration and operation of the illustrated control unit 140 will be described more specifically.

Output monitoring section 170 included in control section 140
Is configured as a voltage monitoring circuit that monitors the DC output voltage Vo in this example. The output monitoring unit 170 includes a resistor 141 and a resistor 14 for dividing and detecting the DC output voltage Vo.
2. It includes a reference voltage source 143 and an error amplifier 144 that amplifies and outputs a voltage difference between the output voltage Vo and the reference voltage.

The sine full-wave generator 150 includes an input AC power source e.
, A detection circuit 151 for detecting a zero cross, a controller 152 for generating a sinusoidal full-wave rectified waveform based on the zero cross signal, and an oscillator 153 for determining an operation frequency of the controller 152. As the controller 152,
For example, μPD78322 can be used.

The illustrated control unit 140 further includes a pulse width control unit 180. The pal width control unit 180 includes a comparison circuit 145, a comparator 146, an oscillator 147, and a latch circuit 148.

The comparison circuit 145 compares the monitor signal A supplied from the error amplifier 144 with the sine full-wave waveform signal B from the controller 152, and outputs the lower one. Comparator 146 compares control signal C output from comparison circuit 145 with pulse current D flowing through the primary winding of main transformer 121, and outputs a signal for determining a pulse width.

The oscillator 147 determines a switching frequency. The latch circuit 148 converts a clock signal supplied from the oscillator 147 and a signal supplied from the comparator 146 from a driving signal (hereinafter, PWM) which is a pulse width modulation signal.
E). In the embodiment, the latch circuit 148 outputs the PWM signal E using the clock signal supplied from the oscillator 147 as the set signal S and the signal supplied from the comparator 146 as the reset signal R. The PWM signal E is supplied to the drive circuit 160 to turn on / off the switch element 122. The comparator 146,
The circuit configuration including the oscillator 147 and the latch circuit 148 is, for example, a switching power supply control IC UC3825.
Is realized as one package component.

Next, the operation will be described. The control unit 140 shown in this embodiment has two loops for stabilizing the output voltage Vo and making the AC input current waveform sinusoidal. First, the first loop is a loop for controlling the output voltage Vo to be constant. The output circuit 130 → the output monitoring unit 170 → the pulse width control unit 180 → the driving circuit 160 →
It is composed of a feedback loop of the switch circuit 120.

The second loop is a control loop for making the input current waveform a sine wave, and the sine full wave generator 150
It is composed of a loop of → pulse width control section 180 → drive circuit 160 → switch circuit 120. On / off operation of the switch element 122 is controlled based on signals from the respective loops.

The stabilization control operation of the output voltage Vo by the first loop is executed by a well-known control operation in this type of stabilized power supply device. Output monitoring unit 1
At 70, the voltage difference between the output voltage Vo and the reference voltage 143 is amplified by the error amplifier 144, and the output voltage monitoring signal A
(See FIG. 2). This output voltage monitoring signal A is
When the voltage value of the output voltage Vo increases, the level decreases,
Conversely, when the voltage value of the output voltage Vo decreases, the DC signal has a higher level.

The sinusoidal operation of the input current waveform by the second loop is performed as follows. First, the full sine wave generator 150 digitally generates a full sine wave signal B (see FIG. 2) synchronized with the phase of the AC power supply from the AC input voltage waveform. The operation of the full sine wave generator 150 will be described in more detail.
Stores a program for generating the sine full-wave waveform signal B together with constants such as sine wave data. The controller 152 performs processing according to this program.

That is, when the AC input voltage waveform causes a zero voltage cross on the time axis, the timing is detected by the zero cross detection circuit 151. This detection signal is sent to the controller 152. Controller 152
When a zero-cross detection signal is supplied, an interrupt is generated and based on the stored sine wave data, at regular time intervals,
The sine full-wave signal B is output via the output port.

For example, data obtained by dividing a sine wave having an amplitude of 1 and a period of １２８ into 128 in the time axis direction is stored in the ROM as sine wave data, and when the AC power supply e is 50 Hz,
This sine wave data is read at a time interval of 78 μs,
Output. Thereby, a sine full-wave waveform signal B is obtained. The cycle or frequency of the AC power supply e can be calculated from the interval of the zero-cross detection signal.

The advantage of having the above-described sine full-wave generator 150 is that even when distortion or noise occurs in the input source, the time interval of the zero-cross signal of the input source is measured and the sine full-wave waveform signal B is output. By adjusting the time interval, a sinusoidal full-wave waveform signal without distortion can be generated. From the viewpoint of improving the power factor, it is desirable to adjust the amplitude of the sinusoidal full-wave waveform signal B to be slightly higher than the DC level of the output voltage control signal A.

Next, the comparator 145 compares the output voltage monitoring signal A with the sine full-wave waveform signal B, and generates a sine-wave control signal C by giving priority to the lower one (FIG. 3). reference).

Further, the comparator 146 and the oscillator 14
7. The PWM signal E is generated by the latch circuit 148,
On / off of the switch element 122 is controlled. The latch circuit 148 is set when the clock of the oscillator 147 is input, and generates a high-level output. Comparator 14
6 is low, the output of latch circuit 148 remains high. When the output of the comparator 146 goes high, the output of the latch circuit 148 goes low.

The comparator 146 compares the control signal C with a detection signal D of a pulse current flowing through the primary winding of the main transformer 121. When the pulse current detection value becomes larger than the control signal C, the output of the comparator 146 is set to a high level and transmitted to the latch circuit 148. Latch circuit 1
48 is reset by a high-level signal supplied from the comparator 146, and the output signal PWM signal E becomes low.

FIG. 4 is a diagram for explaining the pulse forming operation of the latch circuit 148. Oscillator 147 at time t11
When the clock signal is input to the latch circuit 148 from
The PWM signal E goes high. When the PWM signal E becomes high level, the switch element 122 is turned on through the drive circuit 160, a primary pulse current flows, and the pulse current detection signal D is generated.

The pulse current detection signal D rises with time according to the primary pulse current. Then, at time t1 when the pulse current detection signal D becomes a value P1 substantially equal to the control signal C.
Second, the output of the comparator 146 goes high. As a result, the latch circuit 148 is reset, and the PWM signal E goes low.

The timing at which the latch circuit 148 is reset is such that the sine full-wave waveform signal B is lower than the output voltage monitoring signal A for stabilizing the output.
When the sine full-wave waveform signal B is higher than the output voltage monitoring signal A for stabilizing the output, the signal is on the output voltage monitoring signal A. Therefore, the average primary current i has a substantially sinusoidal waveform as shown by the dotted line in FIG.

As described above, since the output voltage Vo is stabilized and the operation is performed so that the maximum value of the current flowing through the switch element 122 becomes equal to the sinusoidal control signal C, the input current waveform is made sinusoidal. be able to. FIG.
The input current waveform diagram actually obtained is shown in FIG. In the case of the input current waveform shown in FIG. 5, extremely excellent results such as a power factor of 0.99 and a harmonic distortion factor (THD) of the input current of 13% are obtained.

In addition, the control unit for stabilizing the output and making the AC input current waveform sinusoidal is constituted by using, for example, an integrated controller.
0 can be simplified. This makes it possible to obtain a high power factor circuit with a simpler configuration and to provide a small, stabilized power supply device.

FIG. 6 is a block diagram showing another embodiment of the stabilized power supply according to the present invention. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The feature of this embodiment is that the output monitoring unit 170 has a circuit configuration for monitoring the output current Io and outputting a current monitoring signal A. The output current Io is detected by an output current detection circuit 190 coupled to the power supply output line. The output current detection circuit 190 includes a current detection element 191
And a resistor 192, and converts the output current Io into a voltage value. The current detection signal, which is a voltage signal, is supplied to the error amplifier 14.
4 and compared with a reference power supply 143. Subsequent control operations are the same as those in FIG. This allows
A control operation is performed so that the output current Io becomes constant.

FIG. 7 is a block diagram showing another embodiment of the stabilized power supply device according to the present invention. In the figure, the same components as those in FIGS. 1 and 6 are denoted by the same reference numerals, and description thereof will be omitted. The feature of this embodiment is that the output monitoring unit 170
The circuit configuration is such that the output voltage Vo and the output current Io are monitored and a power monitoring signal A is output, so that the output power is stabilized. The output voltage Vo and the output current Io detected by the output power monitoring unit are supplied to the power control circuit 149 as an output voltage signal and an output current signal, respectively. In the power control circuit 149, the output power is calculated, compared with a reference power value, and calculated.
The resulting output power control signal is compared by a comparison circuit.
Subsequent control operations are the same as those in FIG. As a result, a control operation is performed such that the output power becomes constant.

FIG. 8 is a block diagram showing another embodiment of the stabilized power supply according to the present invention. In the figure, the same components as those in FIGS. 1, 6, and 7 are denoted by the same reference numerals, and description thereof will be omitted. A feature of this embodiment is that the amplitude of the full sine wave signal B output from the full sine wave generator 150 is changed according to the output voltage Vo.

The control section 140 uses the sine full-wave waveform signal B as a control signal, and controls the PWM signal E according to the amplitude. For example, when the DC output value becomes higher than the target value, the amplitude of the full-sine sine waveform signal B is changed to a smaller value, thereby controlling the pulse width of the PWM signal E to be smaller. Thereby, the DC output value can be stabilized. As described above, the DC voltage includes the output voltage, the output current, and the output power.

In the embodiment, the full sine wave generator 150
Is provided with a monitoring signal A from the output monitoring unit 170. Accordingly, the amplitude of the sine full-wave waveform signal B is controlled according to the monitoring signal A. The illustrated output monitoring unit 170 monitors the output voltage Vo and outputs the voltage monitoring signal A. Therefore, when the output voltage Vo becomes higher than the target value, the amplitude of the sine full-wave waveform signal B is increased. The pulse width of the PWM signal E is controlled in a direction in which the pulse width of the PWM signal E is reduced. Thus, the output voltage Vo can be stabilized.

Alternatively, the output monitor 170 may monitor the output current Io, supply the current monitor signal A to the full sine wave generator 150, and control the output current Io. . Alternatively, the output monitoring unit 170 may monitor the output power, supply the power monitoring signal A to the full sine wave generation circuit 150, and control the output power.

Also in the embodiment shown in FIG. 8, the full sine wave generator 150 generates a full sine waveform signal B synchronized with the phase of the AC power supply e. The control unit 140 uses the sinusoidal full-wave waveform signal B generated as described above as the control signal C for generating the PWM signal E, so that the AC input current can be sinusoidal. For this reason, the harmonic current is reduced, and the problem of various harmonic disturbances is also solved.

The illustrated control unit 140 is similar to the embodiment shown in FIGS. 1, 6 and 7 in that the pulse width control unit 180
Is provided. The pal width control unit 180 controls the comparator 14
6, an oscillator 147 and a latch circuit 148.
The comparator 146 is connected to the control signal C and the main transformer 121.
And outputs a signal for determining the pulse width. The oscillator 147 and the latch circuit 148 have the same configuration as those shown in FIGS. 1, 6, and 7, and perform the same operation.

FIG. 9 is a diagram for explaining the pulse forming operation in the latch circuit 148. Oscillator 147 at time t11
When the clock signal is input to the latch circuit 148 from
The PWM signal E goes high. When the PWM signal E becomes high level, the switch element 122 is turned on through the drive circuit 160, a primary pulse current flows, and a pulse current detection signal D is generated. The pulse current detection signal D is
It rises with time according to the primary pulse current. And
At time t12 when the pulse current detection signal D becomes substantially equal to the value P1 of the control signal B, which is a sine full-wave signal, the output of the comparator 146 goes high. As a result, the latch circuit 148 is reset, and the PWM signal E goes low. The timing at which the latch circuit 148 is reset is a timing at which the pulse current detection signal D becomes a value P1 substantially equal to the control signal B which is a sine full-wave waveform signal.
Therefore, the average primary current i has a substantially sinusoidal waveform as shown by the dotted line in FIG.

When the output voltage Vo becomes higher than the target value, the amplitude value of the sinusoidal full-wave waveform signal B serving as a control signal is changed in a direction of decreasing from the signal B1 to the signal B2. Accordingly, the timing at which the pulse current detection signal D intersects the control signal B, which is a sine full-wave waveform signal, is at the point P
The point shifts from 1 to the point P2, and the output voltage Vo is stabilized.

The output monitor 170 outputs the output current I
When the output current Io is higher than the target value when monitoring the value o, the amplitude of the sinusoidal full-wave waveform signal B serving as a control signal is changed from the signal B1 to the signal B2 so as to decrease. Accordingly, the timing at which the pulse current detection signal D intersects with the control signal B, which is a sine full-wave waveform signal, is at the point P1
To point P2, and the output current Io is stabilized.

Further, when the output power is monitored by the output monitoring unit 170, when the output power becomes higher than the target value, the amplitude of the sine full-wave waveform signal B serving as a control signal is changed from the signal B1 to the signal B2. Then, it is changed in the direction to make it smaller. As a result, the timing at which the pulse current detection signal D crosses the control signal B, which is a sine full-wave signal, shifts from the point P1 to the point P2, and the output power is stabilized.

[0059]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a simple and small stabilized power supply device with a high power factor. (B) It is possible to provide a stabilized power supply device that can reduce harmonic currents and avoid various problems of harmonic interference. (C) It is possible to provide a stabilized power supply device which does not adversely affect the control operation even if noise or distortion occurs in the power supply voltage.

[Brief description of the drawings]

FIG. 1 is a block diagram of a stabilized power supply device according to the present invention.

FIG. 2 is a diagram showing an output monitoring signal and a sine full-wave waveform signal of the stabilized power supply device according to the present invention shown in FIG.

FIG. 3 is a diagram showing a waveform of a control signal of the stabilized power supply device according to the present invention shown in FIG.

FIG. 4 is a diagram for explaining a pulse forming operation in the latch circuit of the stabilized power supply device according to the present invention shown in FIG. 1;

FIG. 5 is an actual input current waveform diagram obtained by the stabilized power supply device according to the present invention shown in FIG. 1;

FIG. 6 is a block diagram showing another embodiment of the stabilized power supply device according to the present invention.

FIG. 7 is a block diagram showing still another embodiment of the stabilized power supply device according to the present invention.

FIG. 8 is a block diagram showing still another embodiment of the stabilized power supply device according to the present invention.

9 is a diagram for explaining a pulse forming operation in the latch circuit of the stabilized power supply device according to the present invention shown in FIG. 8;

[Explanation of symbols]

 110 full-wave rectifier circuit 120 switch circuit 130 output circuit 140 controller 150 sine full-wave generator 170 output monitor

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 4, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

Various power supply devices have been proposed and put into practical use as means for improving the power factor and preventing generation of harmonic current. As one example, an active filter type power supply device is known. The active filter system is employed as a means for improving a power factor in a general forward converter type power supply system in which energy is transmitted to a secondary side while a switch is on. Power supply active filter system is composed of a boost converter to improve the power factor and forward converter has a respective control circuit, by controlling so that the input current is sinusoidal, This is to improve the power factor.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

Yet another object of the present invention is to provide a stabilized power supply device which does not adversely affect the control operation even if noise or distortion occurs in the power supply voltage.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

Moreover, since the sine full-wave waveform signal is digitally created, even if noise or distortion occurs in the power supply voltage, the sine full-wave waveform signal is not affected. Therefore, even if noise or distortion occurs in the power supply voltage, the control operation is not adversely affected.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

Moreover, since the sinusoidal full-wave waveform signal B is digitally created, even if noise or distortion occurs in the power supply voltage, the sinusoidal full-wave waveform signal B is not affected.
Therefore, even if noise or distortion occurs in the power supply voltage, the control operation is not adversely affected.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

The advantage of having the above-described sine full-wave generator 150 is that even when distortion or noise occurs in the input source, the time interval of the zero-cross signal of the input source is measured, and the sine full-wave waveform signal B is output. By adjusting the time interval, a sinusoidal full-wave waveform signal without distortion can be generated. From the viewpoint of improving the power factor, it is desirable to adjust the amplitude of the sinusoidal full-wave waveform signal B to be slightly higher than the DC level of the output voltage control signal A.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction contents]

In the embodiment, the full sine wave generator 150
Is provided with a monitoring signal A from the output monitoring unit 170. Accordingly, the amplitude of the sine full-wave waveform signal B is controlled according to the monitoring signal A. The illustrated output monitoring unit 170 monitors the output voltage Vo and outputs the voltage monitoring signal A. Therefore, when the output voltage Vo becomes higher than the target value, the amplitude of the sine full-wave waveform signal B is increased. The pulse width of the PWM signal E is controlled in a direction in which the pulse width of the PWM signal E is reduced. Thus, it is possible to stabilize the output voltage Vo.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0059

[Correction method] Change

[Correction contents]

[0059]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a simple and small stabilized power supply device with a high power factor. (B) It is possible to provide a stabilized power supply device that can reduce harmonic currents and avoid various problems of harmonic interference. (C) Even if noise or distortion occurs in the power supply voltage, it is possible to provide a stabilized power supply that does not adversely affect the control operation.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kunihiro Sato 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation

Claims (12)

[Claims] 1. A stabilized power supply device including a full-wave rectifier circuit, a switch circuit, an output circuit, and a control unit, wherein the full-wave rectifier circuit performs full-wave rectification on a voltage input from an AC power supply. The switch circuit switches a full-wave rectified output of the full-wave rectifier circuit, The output circuit converts a switching output of the switch circuit into DC and outputs the DC, and the control unit includes: A switch signal is supplied to a switch circuit to control a switch operation to generate a stabilized DC output.The output circuit includes an output monitoring unit and a sine full-wave generation unit. Monitor the DC output of the circuit,
The monitor signal is output, the sine full-wave generator generates a sine full-wave waveform signal synchronized with the phase of the AC power supply, and the control unit outputs the monitor signal and the sine full-wave waveform signal. A stabilized power supply device using at least the sine full-wave waveform signal as a control signal for generating the drive signal. 2. The stabilized power supply device according to claim 1, wherein the control unit outputs a signal obtained by comparing the monitor signal and the sine full-wave signal to the control signal. Stabilized power supply used as. 3. The stabilized power supply device according to claim 2, wherein the switch circuit includes a main switch and a transformer,
The main switch is connected in series to a primary winding of the transformer, the control unit includes a pulse width control unit, and the pulse width control unit includes a primary winding or another winding of the transformer. And controlling the pulse width of the pulse current by detecting a pulse current flowing through the control signal and comparing the detection signal with the control signal. 4. The stabilized power supply device according to claim 3, wherein the output monitoring unit monitors an output voltage and outputs a voltage monitoring signal. 5. The stabilized power supply device according to claim 3, wherein the output monitoring unit monitors an output current and outputs a current monitoring signal. 6. The stabilized power supply device according to claim 3, wherein the output monitoring unit monitors output power and outputs a power monitoring signal. 7. The stabilized power supply device according to claim 1, wherein the sine full-wave generator changes an amplitude of the sine full-wave waveform signal according to a monitor signal, and the control unit includes: A stabilized power supply device, wherein the sine full-wave waveform signal is used as the control signal, and the drive signal is controlled according to the amplitude of the control signal. 8. The stabilized power supply device according to claim 7, wherein the sine full-wave generator is provided with the monitor signal from the output monitor, and the sine full-wave is provided in accordance with the monitor signal. A stabilized power supply in which the amplitude of a waveform signal waveform is controlled. 9. The stabilized power supply device according to claim 8, wherein the switch circuit includes a main switch and a transformer,
The main switch is connected in series to a primary winding of the transformer, the control unit includes a pulse width control unit, and the pulse width control unit includes a primary winding or another winding of the transformer. And controlling the pulse width of the pulse current by detecting a pulse current flowing through the control signal and comparing the detection signal with the control signal. 10. The stabilized power supply device according to claim 8, wherein the output monitoring unit monitors an output voltage and outputs a voltage monitoring signal. 11. The stabilized power supply device according to claim 8, wherein the output monitoring unit monitors an output current and outputs a current monitoring signal. 12. The stabilized power supply device according to claim 8, wherein the output monitoring unit monitors output power and outputs a power monitoring signal.