JP2000262060A - Power-factor improving power supply and method for controlling it on occurrence of abnormality - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power factor improving power supply which enables its use as an electrolytic capacitor to be provided at the output part of an active filter, a component of an optimum breakdown voltage with respect to a voltage to be impressed in a steady state. SOLUTION: A power-factor improving power supply, in which an active filter 110 made up of step-down choppers is used for rectifying and smoothing circuits is provided with a voltage detecting circuit 12A, which detects a voltage VDC between the output terminals 131, 132 of the active filter 110 of a first power supply 100 and a switch operating circuit 13, which operates a switching means 103 for the changeover of the power supply from a commercial power supply to the first power supply 100. When abnormality of the active filter 110 causes the voltage VDC between the output terminals 131, 132 to increase abnormally, the switch operating circuit 13 breaks the power supply of the commercial AC power Vac to the power supply 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power factor improving type power supply device using an active filter such as a step-down chopper type for a rectifying and smoothing circuit, and a method of controlling an abnormal condition thereof.

[0002]

2. Description of the Related Art Today, a rectifier circuit of a capacitor input type is widely used as a rectifier / smoothing circuit of a switching power supply. In this capacitor input type rectifier circuit, the input current flows only during the charging period of the smoothing capacitor, the period of the so-called conduction angle, and the input current becomes a pulse current having a peak value several times the effective value,
The power factor is also around 0.6. The harmonic noise generated when the power factor is reduced has recently become a problem.

[0003] The problem is that the pulse-shaped current waveform contains many harmonic components. Therefore, if a device having a power supply device employing a rectifier circuit of the capacitor input type is connected to the same commercial AC power supply line. The greater the number, the more the commercial AC voltage waveform is distorted. As a result, other devices may malfunction,
In addition, the peak of the commercial AC voltage waveform becomes a trapezoid in which the peak is collapsed due to the peak current and the line impedance. Nevertheless, in order to supply constant power, the commercial AC current further increases, and the commercial AC current has a sharper pulse waveform, which is a problem that further increases the voltage drop and causes a vicious cycle. .

In order to solve these problems of power factor and high-frequency noise, various methods have been proposed in recent years. Among them, among them, active elements such as transistors and FETs are switched at high speed to improve a filter effect. At the same time, active filters realizing miniaturization are attracting attention.

FIG. 5 is a circuit diagram showing a configuration of a conventional power factor improving type power supply device using a general step-down chopper type active filter.

This power factor improving type power supply device controls a pulsating voltage obtained by full-wave rectification of a commercial AC voltage so as to control an output voltage to a predetermined DC voltage.

Reference numerals 101 and 102 in the figure denote input terminals for commercial AC power, reference numeral 103 denotes switch means, reference numeral 110 denotes a step-down chopper type active filter, and reference numeral 111 denotes a control circuit for the active filter 110.

The switch means 103 is a switch means which can be manually turned on / off by a user of the apparatus, has a reset function, and can be forcibly turned off by an external signal. When the switch unit 103 is turned on, the commercial AC power supply Vac is supplied to the power supply device 100. When the switch unit 103 is turned off, the commercial AC power supply is cut off.

Reference numerals 131 and 132 denote active filter output terminals which output a predetermined DC voltage VDC (when the commercial AC power supply is a 230 V system, VDC = about 200 V).
Is). This active filter output terminal 131,
132 is connected to the input side of the DC / DC converter 120.

The DC / DC converter 120 has an RCC
(Ringing Coke Converter)
System, FCC (Forward Coupled Co)
a switching power supply of a so-called insulation type, such as an nverter type, and a predetermined DC output voltage (for example, 3.3 V,
5V, 12V, 24V, 38V, etc.).

DB is a diode bridge for full-wave rectification of the AC power supply voltage, 112 is a switching FET, and 113 is a commutation diode. L1 is a choke coil, the inductance of which is set in accordance with the load power required by the DC / DC converter 120 connected between the active filter output terminals 131 and 132.

C1 is a large-capacity electrolytic capacitor, which is used when a sudden change of each load connected to the output of the power supply device 100 or a temporary voltage drop or a temporary cutoff of the commercial AC power supply which is an input of the power supply device. Also active filter 11
A large-capacity electrolytic capacitor is required to maintain VDC, which is an output of 0, at a predetermined voltage or higher. The filter constituted by the choke coil L2 and the capacitor C2 is a filter for cutting off the high frequency component of the current flowing through the FET 112 from the AC section.

Then, Vaout, Vbou in FIG.
t, Vcout, Vdout are DC / DC converters 1
20 and the output of the power supply device 100, and each predetermined DC voltage is output.

Next, the operation of the power supply device shown in FIG. 5 will be described.

When the switch means 103 is turned on, a commercial AC power supply Vac is supplied from the input terminals 101 and 102. Then, the control circuit 111 is activated by a starting circuit (not shown).
, The active filter 110 is activated, and a predetermined DC voltage VDC is output between the active filter output terminals 131 and 132.

The DC / DC converter 120 becomes operable when the voltage VDC between the active filter output terminals 131 and 132 rises to a predetermined voltage.
Vaout, Vbout, Vcou, which are the outputs of 00
It outputs a DC voltage such as t and Vdout. Vaout,
DC voltages such as Vbout, Vcout, and Vdout are supplied to respective loads, not shown.

The control circuit 111 has a potential difference V between the active filter output terminals 131 and 132, not shown.
DC is always detected, and ON / OFF of the switching FET 112 is controlled so that the voltage VDC is always constant. The ON period of the switching FET 112 is
A current flows through the switching FET 112 via the electrolytic capacitor C1 and the choke coil L1, and the choke coil L
1 stores energy and a DC / DC connected to active filter output terminals 131 and 132.
Energy is also supplied to converter 120. Then, during the OFF period of the switching FET 112, the energy stored in the choke coil L1 during the ON period is supplied to the DC / DC converter 120 via the diode 113.

The DC / DC converter 120 is a so-called switching power supply, receives a voltage VDC between the active filter output terminals 131 and 132 as an input, and uses an insulated transformer, a switching element, and a control circuit to control the voltage.
Control is performed so that each output on the next side has a predetermined constant voltage. Further, the DC / DC converter 120 has a built-in input overvoltage detection circuit. When the input overvoltage detection circuit increases the voltage VDC between the active filter output terminals 131 and 132, which is the input voltage, to a predetermined value or more. The operation of the DC / DC converter 120 is stopped.

[0019]

However, the above-described conventional power factor improving type power supply has the following problems.

The active filter 110 is of a step-down type, and its output voltage VDC is a commercial AC voltage Vac
Is set to a voltage lower than the peak value of (for example,
VDC = DC200 when AC input is AC230V system
V etc.). However, in consideration of the case where the switching element 112 is damaged, it is necessary to use a component having a very large withstand voltage with respect to the steady voltage for the electrolytic capacitor C1. For example, if the AC input is AC 230V, 40
It is necessary to use a 0 VW class electrolytic capacitor. Even if the electrolytic capacitor has the same capacity, the larger the withstand voltage is, the larger the electrolytic capacitor becomes. Therefore, the increase in the size of the electrolytic capacitor C1 has hindered downsizing and cost reduction of the power supply device.

The present invention has been made in view of the above-mentioned conventional problems, and has a power factor improvement in which a component having an optimum withstand voltage with respect to a voltage applied in a steady state can be used as an electrolytic capacitor provided at an output portion of an active filter. It is an object of the present invention to provide a power supply device of the type and a control method at the time of its abnormality.

[0022]

In order to achieve the above object, a power factor correction type power supply according to the present invention outputs a predetermined DC output voltage based on an input voltage from an AC power supply. A power supply device having an active filter; and switch means for energizing / de-energizing the power supply from the AC power supply, and interrupting the power supply to the power supply device when the DC output voltage of the active filter is abnormal. It is characterized by the following.

According to a second aspect of the present invention, there is provided a power supply device having an active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a power supply from the AC power supply. Switch means for turning on / off the power supply, wherein the power supply to the power supply device is cut off when the output voltage of the power supply device has decreased for a predetermined period.

According to a third aspect of the present invention, there is provided a power factor improving type power supply device that outputs a predetermined DC output voltage based on an input voltage from an AC power supply, and is connected to an output side of the active filter. DC / DC
A first power supply device including a converter, a second power supply device that is separate from the first power supply device, a switch that cuts off power supply to the first power supply device, and a DC power supply of the first power supply device. A voltage detection circuit for detecting an output voltage, and a drive circuit for driving the switch means, wherein when the DC output voltage of the active filter is abnormal, power supply to the first power supply device is cut off. I do.

According to a fourth aspect of the present invention, there is provided a power factor improving type power supply device comprising: an active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply; and an active filter connected to an output side of the active filter. DC / DC
A first power supply device comprising a converter;
A second power supply that is separate from the first power supply, a switch that cuts off power supply to the first power supply and the second power supply, and detects a DC output voltage of the first power supply. A voltage detection circuit; and a drive circuit for driving the switch means, wherein power supply to the first power supply device and the second power supply device is cut off when the DC output voltage of the active filter is abnormal. And

According to a fifth aspect of the present invention, there is provided a power factor improving type power supply device, wherein the active filter outputs a predetermined DC output voltage based on an input voltage from an AC power supply, and is connected to an output side of the active filter. DC / DC
A first power supply device including a converter, a second power supply device that is separate from the first power supply device, a switch that cuts off power supply to the first power supply device, and a DC power supply of the first power supply device. A voltage detection circuit for detecting an output voltage; and a drive circuit for driving the switch means, wherein the first power supply device includes a first voltage detection circuit when the output voltage is reduced over a predetermined period.
The power supply to the power supply device is shut off.

According to a sixth aspect of the present invention, there is provided a power factor improving type power supply device, wherein the active filter outputs a predetermined DC output voltage based on an input voltage from an AC power supply, and is connected to an output side of the active filter. DC / DC
A first power supply device including a converter, a second power supply device separate from the first power supply device, switch means for interrupting power supply to the first power supply device and the second power supply device, (1) a voltage detection circuit for detecting a DC output voltage of the power supply device; and a drive circuit for driving the switch means. The power supply to the power supply device and the second power supply device is shut off.

According to a seventh aspect of the present invention, in the power supply with improved power factor according to any one of the first to sixth aspects, the active filter is a step-down chopper type active filter. It is characterized by the following.

According to a power factor improvement type power supply device according to an eighth aspect of the present invention, in the power factor improvement type power supply device according to any one of the first to seventh aspects, the switch means can be manually turned on / off. It can be forcibly turned off by an external signal.

According to a ninth aspect of the present invention, in the power factor improvement type power supply device according to any one of the first to seventh aspects, the switch means is constituted by a relay. I do.

According to a tenth aspect of the present invention, in the power factor improving type power supply device abnormality control method, an active power supply for outputting a predetermined DC output voltage based on an input voltage from an AC power supply is provided.
In a power factor improving type power supply device having a power supply device having a filter and a switch means for energizing / de-energizing power supply from an AC power source, a voltage detection circuit for detecting a DC output voltage of the active filter is provided. The power supply to the power supply device is interrupted when the DC output voltage of the active filter is abnormal.

According to the present invention, there is provided a power factor improving type power supply device with an abnormal control method for outputting a predetermined DC output voltage based on an input voltage from an AC power source.
In a power factor improving type power supply device having a power supply device having a filter and a switch means for energizing / de-energizing power supply from an AC power source, a voltage detection circuit for detecting a DC output voltage of the active filter is provided. The power supply to the power supply is cut off when the output voltage of the power supply drops over a predetermined period.

According to a twelfth aspect of the present invention, there is provided a power factor improving type power supply device with an abnormal control method for outputting a predetermined DC output voltage based on an input voltage from an AC power source.
A first power supply device including a filter and a DC / DC converter connected to an output side of the active filter; a second power supply device different from the first power supply device;
A power factor improving type power supply device comprising: switch means for interrupting power supply to the first power supply device, wherein a DC output voltage of the first power supply device is detected, and when the DC output voltage of the active filter is abnormal, The power supply to the first power supply is cut off.

According to a thirteenth aspect of the present invention, there is provided a power factor improving type power supply device with an abnormal control method for outputting a predetermined DC output voltage based on an input voltage from an AC power source.
A first power supply device including a filter and a DC / DC converter connected to an output side of the active filter; a second power supply device different from the first power supply device;
A power factor improving type power supply device comprising: a switch unit for interrupting power supply to the first power supply device and the second power supply device; detecting a DC output voltage of the first power supply device, When the DC output voltage is abnormal, power supply to the first power supply device is cut off.

According to a fourteenth aspect of the present invention, there is provided a power factor improving type power supply device with an abnormal control method for outputting a predetermined DC output voltage based on an input voltage from an AC power source.
A first power supply device including a filter and a DC / DC converter connected to an output side of the active filter; a second power supply device different from the first power supply device;
A power factor improving type power supply device comprising: a switch unit for interrupting power supply to the first power supply device, wherein a DC output voltage of the first power supply device is detected, and an output voltage of the first power supply device is set to a predetermined value. The power supply to the first power supply device and the second power supply device is shut off when the power supply decreases over a period.

According to a fifteenth aspect of the present invention, there is provided a power factor improving type power supply device with an abnormal control method for outputting a predetermined DC output voltage based on an input voltage from an AC power source.
A first power supply device including a filter and a DC / DC converter connected to an output side of the active filter; a second power supply device different from the first power supply device;
A power factor improving type power supply device comprising: switch means for interrupting power supply to the first power supply device and the second power supply device; detecting a DC output voltage of the first power supply device, The power supply to the first power supply device and the second power supply device is cut off when the output voltage of the first power supply decreases over a predetermined period.

According to a sixteenth aspect of the present invention, there is provided a method for controlling a power factor correction type power supply in an abnormal state.
5. The control method according to claim 5, wherein the active filter is a step-down chopper type active filter.

According to a seventeenth aspect of the present invention, there is provided the power factor improving type power supply control method in the event of an abnormality.
6. The method of controlling a power factor correction type power supply device according to claim 6, wherein said switch means can be manually turned on / off and can be forcibly turned off by an external signal.

According to the eighteenth aspect of the present invention, there is provided the power factor improving type power supply device in the abnormal state control method.
6. The method of controlling a power factor improving type power supply device according to claim 6, wherein said switch means is constituted by a relay.

[0040]

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

(First Embodiment) FIG. 1 is a circuit diagram showing a configuration of a main part of a power factor correction type power supply according to a first embodiment of the present invention. Are denoted by the same reference numerals, and description thereof is omitted.

The present embodiment is different from the conventional apparatus of FIG. 5 in that the switch means 10 in the configuration shown in FIG.
3, between the commercial transformer 10 having the commercial AC power supply Vac as input, the second power supply 11 having the output of the commercial transformer 10 as input, and the output terminals 131 and 132 of the active filter 110 in the first power supply 100. Voltage V
Voltage detection circuit 12A for detecting DC, and switch means 1
03 and a switch drive circuit 13 that outputs a reset signal. Note that the DC voltage Vcc output from the second power supply device 11 is used as a power supply for the voltage detection circuit 12B and the switch drive circuit 13.

Next, the operation of this embodiment will be described.

When the switch means 103 is turned on, the commercial AC power supply Vac is connected to the first power supply 100 and the commercial transformer 1.
0 is supplied. The normal operation of the first power supply device 100 is the same as that of the above-described conventional device of FIG. That is,
A predetermined DC voltage VD is determined by the active filter 110.
C is output between the output terminals 131 and 132. DC / D
The C converter 120 receives the output VDC of the active filter 110 as an input, and outputs a predetermined DC constant voltage such as Vaout, Vbout, Vcout, Vdout as the output of the first power supply device 100. Vaout, Vb
DC constant voltages such as out, Vcout, and Vdout are supplied to loads (not shown).

On the other hand, when the commercial AC power supply Vac is supplied, the commercial transformer 10 outputs an AC voltage obtained by insulating the commercial AC power supply Vac. The second power supply device 11 performs control such that the output of the commercial transformer 10 is input, rectified and smoothed, and a predetermined DC voltage VCC is output.

The voltage detection circuit 12B constantly detects the voltage VDC between the active filter output terminals 131 and 132, and judges that the active filter 110 is abnormal when the voltage VDC rises above a predetermined value. And
A switch means OFF signal is output to the switch means drive circuit 13.

When the switch means OFF signal is inputted, the switch means drive circuit 13 turns off the switch means 103 by the output VCC of the second power supply apparatus 11, and connects the first power supply apparatus 100 of the commercial AC power supply Vac to the commercial power supply. Transformer 1
The power supply to 0 is cut off. That is, when an overvoltage occurs between the terminals 131 and 132 due to an abnormality of the active filter 110, the supply of the commercial AC power supply Vac to the first power supply device 100 and the commercial transformer 10 is cut off.

As described above, in this embodiment, the active
When an abnormal voltage is generated between the terminals 131 and 132 due to an abnormality in the filter 110, the power supply to the electrolytic capacitor C1 can be stopped by shutting off the power supply to the power supply device 100. Therefore, the electrolytic capacitor C
As 1, the necessity of using a component having an excessively high withstand voltage with respect to a voltage applied in a steady state is eliminated, and an electrolytic capacitor having an optimum withstand voltage with respect to a voltage applied in a steady state can be used. This makes it possible to reduce the size of the power supply device 100 by reducing the area occupied by the electrolytic capacitor C1, reduce the number of electrolytic capacitors used, and reduce costs.

In the present embodiment, the description has been given of the configuration in which the commercial AC power is supplied to the commercial transformer 10 from the subsequent stage of the switch means 103.
The same effect can be obtained even when the commercial AC power is supplied to the commercial transformer 10 from the preceding stage.

(Second Embodiment) FIG. 2 is a circuit diagram showing a configuration of a main part of a power factor correction type power supply according to a second embodiment of the present invention. Are denoted by the same reference numerals, and description thereof is omitted.

This embodiment is different from the first embodiment in that a voltage detection circuit 12B for detecting the output of the DC / DC converter 120, that is, the output of the first power supply device 100,
The point is that the voltage detection circuit 12A is provided in place of the voltage detection circuit 12A of the first embodiment.

In this embodiment, the voltage detection circuit 12
Description will be made assuming that B detects Vaout in the figure.

Next, the operation of this embodiment will be described.

When the switch means 103 is turned on, the commercial AC power supply Vac is connected to the first power supply 100 and the commercial transformer 1.
0 is supplied. The normal operation of the first power supply device 100 is the same as that of the conventional device and the device of the first embodiment.

The commercial transformer 10 has a commercial AC power supply Vac
Is supplied, an AC voltage obtained by insulating and dropping the commercial AC power supply Vac is output. The second power supply 11 is a commercial transformer 1
0 is input and rectified and smoothed, and a predetermined DC voltage V
Control to output CC is performed.

The voltage detection circuit 12B is connected to the
Of the 0 output voltages, for example, a Vaout DC voltage is always detected. And, as described above, DC / DC
Converter 120 has a built-in input overvoltage detection circuit. When input voltage VDC between terminals 131 and 132 rises to a predetermined value or more, the operation of DC / DC converter 120 is performed by the input overvoltage detection circuit. Stop,
As a result, the output of the DC / DC converter 120, V
aout decreases. For example, as in such a case, when Vaout falls below a predetermined voltage for a predetermined time, the voltage detection circuit 12B determines that the first power supply device 100 is abnormal, and outputs a switch OFF signal to the switch driving. Output to the circuit 13.

When the switch means OFF signal is inputted, the switch means drive circuit 13 turns off the switch means 103 by the output VCC of the second power supply apparatus 11, and the first power supply apparatus 100 of the commercial AC power supply Vac and the commercial power supply The power supply to the transformer 10 is cut off. That is, when an abnormal voltage is generated between the terminals 131 and 132 due to some abnormality, the DC / DC converter 120 stops, and
Each output of the / DC converter 120 decreases. This DC
The output of the DC / DC converter 120 is detected by the voltage detection circuit 12.
B is detected, the switch means 103 is turned off, and the commercial AC power supply Vac is cut off.

As described above, even in the configuration of the present embodiment, when the voltage VDC between the terminals 131 and 132 rises abnormally due to the abnormality of the active filter 110, the first power supply device 100 of the commercial AC power supply Vac Since the power supply to the power supply can be cut off, similarly to the first embodiment, a component having a withstand voltage suitable for the voltage (VDC) applied steadily can be used as the electrolytic capacitor C1.

As in the first embodiment, in this embodiment, the description has been given of the configuration in which the commercial AC power is supplied to the commercial transformer 10 from the subsequent stage of the switch unit 103. More commercial transformer 1
The same effect can be obtained even when the commercial AC power is supplied to zero.

(Third Embodiment) FIG. 3 is a circuit diagram showing a main part of a power factor correction type power supply according to a third embodiment of the present invention. Are denoted by the same reference numerals, and description thereof is omitted.

The present embodiment is different from the above-described conventional device in that the first power supply device 100 is supplied with the power of the commercial AC power supply Vac via the AC relay means 103A.
The point at which the AC relay drive circuit 14 for driving the C relay means 103A is connected, and the voltage VD between the terminals 131 and 132 which are the outputs of the active filter 110
The point is that a voltage detection circuit 12C for detecting C is connected. Note that the AC relay means 103A is connected to the commercial AC power supply Vac over a period in which no current is flowing through the coil.
And the first power supply device 100 are electrically connected. Further, power is supplied to the voltage detection circuit 12C and the AC relay drive circuit 14 by a voltage which is made constant from the voltage VDC between the terminals 131 and 132 (not shown).

Next, the operation of this embodiment will be described.

When the outlet of the device is connected, the commercial AC power supply Vac is supplied to the first power supply device 100. The normal operation of the first power supply device 100 is the same as that of FIG. The voltage detection circuit 12C includes a voltage VDC between the terminals 131 and 132.
Is always detected, and the voltage VDC between the terminals 131 and 132 is detected.
If it rises above a certain value, it is determined that the active filter 110 is abnormal, and a relay ON signal is output to the AC relay drive circuit 14.

When the relay ON signal is input, the AC relay drive circuit 14 turns on the AC relay means via the commercial AC power supply Vac, and cuts off the power supply of the commercial AC power supply Vac to the first power supply device 100. . In other words, active
When an overvoltage occurs between the terminals 131 and 132 due to an abnormality of the filter 110, the power supply of the commercial AC power supply Vac to the first power supply device 100 is cut off.

As described above, even in the configuration of the present embodiment, when the voltage VDC between the terminals 131 and 132 rises abnormally due to the abnormality of the active filter 110, the first power supply device 100 of the commercial AC power supply Vac Since the power supply to the power supply can be cut off, similarly to the first embodiment, a component having a withstand voltage suitable for the voltage (VDC) applied steadily can be used as the electrolytic capacitor C1.

In this embodiment, although the means is effective in a device having a power supply device that is started in synchronization with the outlet, the AC relay means 103A shown in FIG.
The same effect can be obtained even when a switch means that can be turned on / off by the user is provided between the relay drive circuit 14 and the commercial AC power supply Vac.

(Fourth Embodiment) FIG. 4 is a circuit diagram showing a configuration of a main part of a power factor correction type power supply according to a fourth embodiment of the present invention, which is common to the power supply shown in FIGS. Are denoted by the same reference numerals, and description thereof will be omitted.

The present embodiment has a configuration in which the AC relay means 103A is replaced with the DC relay means 103B in the configuration of FIG. 3 according to the third embodiment, and is combined with the first embodiment of FIG. That is, in the present embodiment, the point that the power of the commercial AC power supply Vac is supplied to the first power supply device 100 via the DC relay means 103B, and the DC relay drive circuit 15 for driving the DC relay means 103B are connected. The feature is that it is done.

The DC relay means 103B is connected to the commercial AC power supply Vac over a period in which no current is flowing through the coil.
And the power supply device 100 are electrically connected. Also, the DC voltage Vc, which is the output of the second power supply device 11,
c is used as a power source for the voltage detection circuit 12A and the DC relay drive circuit 15.

Next, the operation of the present embodiment will be described.

When the outlet of the device is connected, the commercial AC power supply Vac is connected to the first power supply device 100 and the commercial transformer 10.
Supplied to The normal operation of the first power supply device 100 is the same as that of the conventional device of FIG. The voltage detection circuit 12A constantly detects the voltage VDC between the terminals 131 and 132, and when the voltage VDC rises above a predetermined value, determines that the active filter 110 is abnormal and turns on the relay.
The signal is output to the DC relay drive circuit 15.

When the relay ON signal is input, the DC relay drive circuit 15 outputs Vcc, which is the output of the second power supply device 11.
To turn on the DC relay means 103B, and cut off the power supply of the commercial AC power supply Vac to the -th power supply device 100. That is, when an overvoltage occurs between the terminals 131 and 132 due to the abnormality of the active filter 110, the power supply of the commercial AC power supply Vac to the first power supply device 100 is cut off.

As described above, even in the configuration of the present embodiment, when the voltage VDC between the terminals 131 and 132 rises abnormally due to the abnormality of the active filter 110, the first power supply unit 100 of the commercial AC power supply Vac Since the power supply to the power supply can be cut off, similarly to the first embodiment, a component having a withstand voltage suitable for the voltage (VDC) applied steadily can be used as the electrolytic capacitor C1.

Although the present embodiment is effective in a device having a power supply device that is started in synchronization with an outlet, a switch means that can be turned on / off by a user is provided between the commercial transformer 10 and the commercial AC power supply Vac. Even in the case of providing the same, the same effect as the first embodiment can be obtained.

As described above, DC / DC converter 120 has a built-in input overvoltage detection circuit, and when the voltage VDC between terminals 131 and 132, which is the input voltage, rises to a predetermined value or more. It has a function of stopping the operation of the DC converter 120. Therefore, as in the second embodiment shown in FIG.
The output voltage of the C converter 120, that is, the first power supply device 1
The same effect as in the first embodiment can be obtained even when the circuit configuration is such that any one of the output voltages 00 and 00 outputs a relay ON signal to the DC relay drive circuit 15.

[0076]

As described above in detail, according to the first to eighteenth aspects of the present invention, an overvoltage occurs in the electrolytic capacitor provided at the output of the active filter due to an abnormality of the active filter. Even if you do
Since the power supply from the commercial AC power supply to the power supply device having the active filter is cut off, the power supply to the electrolytic capacitor can also be stopped. Therefore, it is not necessary to use a component having an excessively high withstand voltage with respect to a voltage applied in a steady state as an electrolytic capacitor provided at an output portion of the active filter, and it is possible to use an electrolytic capacitor with an optimum withstand voltage. This makes it possible to reduce the size of the power supply device by reducing the area occupied by the electrolytic capacitor, reduce the number of electrolytic capacitors used, and reduce the cost of the device.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a main part configuration of a power factor correction type power supply device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a main configuration of a power factor correction type power supply device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a configuration of a main part of a power factor correction type power supply device according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a main configuration of a power factor correction type power supply device according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a conventional power factor improving power supply device using a step-down chopper type active filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Commercial transformer 11 Second power supply device 12, 12A, 12B Voltage detection circuit 13 Switch drive circuit 14 AC relay drive circuit 15 DC relay drive circuit 100 Power supply device 101, 102 Commercial AC power supply input terminal 103 Switch means 103A AC relay means 103B DC Relay means 110 Step-down chopper type active filter 111 Active filter control circuit 112 Switching FET 113 Commutation diode 120 DC / DC converter 131, 132 Active filter output terminal L1, L2 Choke coil C1 Electrolytic capacitor C2 Capacitor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02M 3/00 H02M 3/00 CF term (Reference) 5H006 AA02 AA04 CA02 CB01 DA02 DA04 DB01 DC05 FA01 GA04 5H420 BB13 BB18 CC04 DD02 EA14 EA39 EA49 EB01 FF03 FF25 LL02 NB31 NE12 5H430 BB01 BB09 BB11 EE06 EE07 FF01 FF13 LA02 5H730 AA02 AA12 AA18 BB13 BB57 BB86 CC05 DD04 DD10 EE08 EE10 XX23 A01 XXXXXA XXXXX NN12 NN18

Claims (18)

[Claims] 1. A power supply device having an active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a switch for turning on / off power supply from the AC power supply. A power factor improving type power supply device for shutting off power supply to the power supply device when the DC output voltage of the active filter is abnormal. 2. A power supply device having an active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and switch means for turning on / off power supply from the AC power supply. And a power factor improving type power supply unit that shuts off power supply to the power supply unit when the output voltage of the power supply unit has decreased over a predetermined period. 3. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC / DC converter connected to an output side of the active filter.
A first power supply device configured by a DC converter, a second power supply device separate from the first power supply device, a switch unit that cuts off power supply to the first power supply device, A voltage detection circuit for detecting a DC output voltage; and a drive circuit for driving the switch means, wherein power supply to the first power supply device is cut off when the DC output voltage of the active filter is abnormal. Power factor improving type power supply. 4. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC / DC connected to an output side of the active filter.
A first power supply configured by a DC converter, a second power supply in a system different from the first power supply, and interrupting power supply to the first power supply and the second power supply. Switch means; a voltage detection circuit for detecting a DC output voltage of the first power supply device; and a drive circuit for driving the switch means, wherein the first power supply device is used when the DC output voltage of the active filter is abnormal. And a power factor improving type power supply, wherein power supply to the second power supply is cut off. 5. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC / DC connected to an output side of the active filter.
A first power supply device configured by a DC converter, a second power supply device separate from the first power supply device, a switch unit that cuts off power supply to the first power supply device, A voltage detection circuit for detecting a DC output voltage; and a drive circuit for driving the switch means, wherein the first power supply is supplied to the first power supply when the output voltage is reduced over a predetermined period. A power factor improving type power supply characterized by shutting off power supply. 6. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC / DC connected to an output side of the active filter.
A first power supply device configured by a DC converter, a second power supply device separate from the first power supply device, a switch unit configured to cut off power supply to the first power supply device and the second power supply device, A voltage detection circuit that detects a DC output voltage of the first power supply device; and a drive circuit that drives the switch means. The voltage detection circuit includes a voltage detection circuit including a case where the output voltage of the first power supply device decreases over a predetermined period. A power factor improving type power supply, wherein power supply to a first power supply and a second power supply is cut off. 7. The power factor improving type power supply device according to claim 1, wherein said active filter is a step-down chopper type active filter. 8. The power factor improving type power supply device according to claim 1, wherein said switch means can be turned on / off manually and can be forcibly turned off by an external signal. 9. A power factor improving type power supply device according to claim 1, wherein said switch means comprises a relay. 10. A power supply having an active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a switch means for turning on / off power supply from the AC power supply. In the power supply device with improved efficiency, a voltage detection circuit for detecting the DC output voltage of the active filter is provided, and when the DC output voltage of the active filter is abnormal, power supply to the power supply device is cut off. Abnormal control method for power factor improving type power supply unit. 11. A power supply having an active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a switch means for turning on / off power supply from the AC power supply. In the power supply apparatus with improved efficiency, a voltage detection circuit for detecting a DC output voltage of the active filter is provided, and when the output voltage of the power supply decreases over a predetermined period, power is supplied to the power supply. An abnormal control method for a power factor improving type power supply characterized by shutting off. 12. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC connected to an output side of the active filter.
Power factor improvement comprising: a first power supply device composed of a DC / DC converter; a second power supply device separate from the first power supply device; and switch means for interrupting power supply to the first power supply device. In the power supply device, a DC output voltage of the first power supply device is detected, and power supply to the first power supply device is cut off when the DC output voltage of the active filter is abnormal. Power supply error control method. 13. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC connected to an output side of the active filter.
A first power supply comprising a DC / DC converter, a second power supply separate from the first power supply, and switch means for interrupting power supply to the first power supply and the second power supply. Wherein the DC output voltage of the first power supply is detected, and power supply to the first power supply is cut off when the DC output voltage of the active filter is abnormal. Abnormal power control method for power factor improving type power supply. 14. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC connected to an output side of the active filter.
Power factor improvement comprising: a first power supply device composed of a DC / DC converter; a second power supply device separate from the first power supply device; and switch means for interrupting power supply to the first power supply device. In the type power supply device, a DC output voltage of the first power supply device is detected, and when the output voltage of the first power supply device decreases over a predetermined period, the DC power supply to the first power supply device and the second power supply device An abnormal time control method for a power factor improving type power supply device characterized by shutting off power supply. 15. An active filter for outputting a predetermined DC output voltage based on an input voltage from an AC power supply, and a DC connected to an output side of the active filter.
A first power supply comprising a DC / DC converter, a second power supply separate from the first power supply, and switch means for interrupting power supply to the first power supply and the second power supply. A power factor improving type power supply device comprising: detecting a DC output voltage of the first power supply device, and when the output voltage of the first power supply device decreases over a predetermined period, the first power supply device and the An abnormal time control method for a power factor correction type power supply, characterized by shutting off power supply to a second power supply. 16. The method according to claim 10, wherein the active filter is a step-down chopper type active filter. 17. The power factor improving type power supply apparatus according to claim 10, wherein said switch means can be manually turned on / off and can be forcibly turned off by an external signal. Time control method. 18. The method according to claim 10, wherein the switching means comprises a relay.