JP3388278B2 - Converter device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to protection of a converter device which converts DC power from AC power and supplies the converted power.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing a configuration example of a conventional converter device. This converter device 2 is
The commercial AC power supply 1 supplies 3-phase AC power to a main circuit bridge 9 made of a semiconductor, and the main circuit bridge 9 rectifies the supplied 3-phase AC power into DC power and outputs the DC power. The DC power output from the main circuit bridge 9 is given to the inverters 3, 4 and 5 each having the smoothing capacitor 18. Among the three-phase input lines of the main circuit bridge 9, the CT6 (Current Transf
ormer) are respectively attached, the outputs of these two CT6 are given to the current detector 7, and the input current to the main circuit bridge 9 is detected.

A DC voltage detection circuit 8 is connected between the output lines of the main circuit bridge 9 and detects the DC voltage output from the converter device 2. The main circuit bridge 9, CT 6 and DC voltage detection circuit 8 constitute a converter main circuit 10. The DC voltage value detected by the DC voltage detection circuit 8 is given to the voltage controller 12 and the overvoltage detection circuit 13, and the voltage controller 12 gives this DC voltage value and the reference value of the DC voltage output by the converter device 2. The deviation from the reference DC voltage value from the reference circuit 11 is amplified and output. The overvoltage detection circuit 13 gives a signal for stopping to the interlock circuit 16 when the DC voltage value from the DC voltage detection circuit 8 reaches a preset overvoltage.

The current value detected by the current detector 7 is given to the current controller 14 and the overcurrent detection circuit 15, and the current controller 14 amplifies the deviation between this current value and the output of the voltage controller 12 to obtain the current value. It is given to the main circuit bridge 9 as a control signal. The overcurrent detection circuit 15 outputs a signal for stopping when the current value from the current detector 7 reaches a preset current value.
Give to. The interlock circuit 16 stops the main circuit bridge 9 and stops the converter main circuit 10 when receiving a stop signal from the overvoltage detection circuit 13 or the overcurrent detection circuit 15.

The operation of the converter device 2 having such a configuration will be described below. The converter device 2 supplies direct-current power to the voltage source inverters 3 to 5 including the capacitor load 18, and controls the direct-current voltage to be constant against variations in the load. That is, the output voltage is the reference circuit 11
Is controlled by the voltage controller 12 so that it becomes the reference DC voltage value output by.

When the load includes the capacitor 18, for example, if the load of the inverter 3 increases and a large amount of current flows, the charge of the capacitor 18 decreases and the DC voltage instantaneously decreases. Since the voltage controller 12 amplifies the deviation between the detection value of the DC voltage detection circuit 8 and the reference DC voltage value and uses it as the current instruction signal, when the load of the inverter 3 suddenly increases, the detection value of the DC voltage detection circuit 8 is increased. And the reference DC voltage value increase, and the reference current value output to the current controller 14 increases. Therefore, the current instruction value that the current controller 14 gives to the main circuit bridge 9 increases,
The main circuit bridge 9 operates so as to supply a large amount of current to the capacitor 18 and reduce fluctuations in the DC voltage detected by the DC voltage detection circuit 8.

The amplification factor of the voltage controller 12 is calculated based on the capacity of the capacitor 18 or the like serving as a load, and is set so that the DC voltage control system is stable. For example, when the amplification factor is high, overshoot and undershoot are repeated. In that case, when the change amount reaches the voltage value set in the overvoltage detection circuit 13,
A signal for stopping is given to the interlock circuit 16 from the overvoltage detection circuit 13, and the interlock circuit 16 stops the main circuit bridge 9 and the converter main circuit 10 to protect the constituent devices.

However, when the hunting, which is a repetition of overshoot and undershoot, does not reach the voltage value set in the overvoltage detection circuit 13,
If the interlock circuit 16 does not operate and the hunting continues as it is, the temperature of the capacitor 18, which is a load, may increase due to the ripple current and may be damaged. The overcurrent detection circuit 15 gives a signal for stopping to the interlock circuit 16 when the current value from the current detector 7 reaches a preset current value. The circuit bridge 9 is stopped and the converter main circuit 10 is stopped to protect the constituent devices.

[0009]

As described above, in the conventional converter device 2, the interlock circuit 16 is activated and stopped when the overvoltage more than the overvoltage set value occurs even once. Even when a voltage fluctuation occurs due to the normal load fluctuation of No. 5, the problem occurs that the overvoltage set value is set low to stop the operation. Conversely, if the overvoltage set value is set high, the interlock circuit 16 is set.
There is a problem that the capacitor 18 is damaged due to hunting in the voltage range in which the capacitor does not operate.

As a technique for coping with the voltage fluctuation of DC power, Japanese Patent Laid-Open No. 6-284732 discloses a voltage change of a smoothing capacitor due to a load change and obtains a rate of change thereof so that control characteristics are not unstable. , "Voltage power supply device" that suppresses fluctuation of output voltage by adjusting the change rate value with a voltage change rate value gain adjuster and making it a part of the feedback amount to the current control calculator is disclosed. . In addition, JP-A-6
Japanese Patent Publication No. 3-052696 discloses a "DC bus system AC variable speed device" for controlling a converter device by a voltage controller, a current controller, and the like. The present invention has been made in view of the above-described circumstances, and when low-level voltage hunting occurs, it is detected regardless of the frequency, the voltage hunting is suppressed, and the voltage hunting is protected. It is an object of the present invention to provide a converter device capable of

[0011]

A converter device according to a first aspect of the present invention includes a converter section for supplying DC power converted from AC power, a DC voltage detection circuit for detecting a DC voltage output by the converter section, and A reference circuit that outputs a reference value of the DC voltage, a voltage controller that amplifies and outputs a deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit, and an input to the converter unit. A current detector that detects a current, a current controller that amplifies a deviation between a current value detected by the current detector and an output value of the voltage controller, and supplies the current controller as a current control signal to the converter unit, and the DC voltage detection circuit. When the detected voltage vibrates, a vibration judgment voltage setting device that sets a voltage for judging the vibration, and a voltage detected by the DC voltage detection circuit. The first and second comparators that compare the voltage set by the vibration determination voltage setting device and output a voltage corresponding to the amount by which the detected voltage exceeds the set voltage, and the voltage output by the first comparator Based on this, it is determined whether or not the proportional gain of the voltage controller should be reduced and the integration time of the current controller should be extended. And a gain determining unit that outputs a signal that reduces the value and extends the integration time by a predetermined value.

In the converter device according to the second aspect of the present invention, the gain determination unit reduces the proportional gain of the voltage controller of the integrator for integrating the voltage output by the first comparator and the voltage output by the integrator, Moreover, when the level setter that sets the level for extending the integration time of the current controller is compared with the level set by the level setter and the voltage output by the integrator, when the voltage reaches the level. To output a signal that reduces the proportional gain by a predetermined value and extends the integration time by a predetermined value, and
A second comparator that resets the integrator.

In the converter device according to the third aspect of the present invention, the gain determination unit includes a waveform shaping circuit for shaping the output of the first comparator into a rectangular wave, a counter for counting the rectangular wave output by the waveform shaping circuit, and A judgment value setting device for setting a judgment value for reducing the proportional gain of the voltage controller of the count value of the counter and further extending the integration time of the current controller, the judgment value set by the judgment value setting device, and the counter. And outputs a signal for reducing the proportional gain by a predetermined value and extending the integration time by a predetermined value when the count value reaches the determination value.
A third comparator for resetting the counter.

A converter device according to a fourth aspect of the present invention includes a reset circuit for resetting a counter when the rectangular wave output from the waveform shaping circuit is not input for a predetermined time.

In the converter device according to the fifth aspect of the present invention, the gain determination section has a waveform shaping circuit for shaping the output of the first comparator into a rectangular wave and a clock generator, and the rectangular wave output by the waveform shaping circuit is used. And an up / down counter for counting down the clock generated by the clock generator, and a judgment value for reducing the proportional gain of the voltage controller of the count value of the up / down counter and further extending the integration time of the current controller. Is compared with the judgment value set by the judgment value setter and the count value of the up / down counter, and when the count value reaches the judgment value, the proportional gain is set to a predetermined value. A fourth comparator that outputs a signal that reduces the value and extends the integration time by a predetermined value; and when the fourth comparator outputs the signal and the waveform shaping circuit. There when the rectangular wave output is not input a predetermined time, characterized in that it comprises a reset circuit for starting a countdown of the clock to the up-down counter.

According to a sixth aspect of the present invention, there is provided a converter device for supplying a direct current power converted from alternating current power, a direct current voltage detection circuit for detecting a direct current voltage output by the converter part, and a reference value of the direct current voltage. Reference circuit to output,
A voltage controller that amplifies and outputs a deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit, a current detector that detects an input current to the converter unit, and the current detection When the voltage detected by the DC voltage detection circuit and the current controller that amplifies the deviation between the current value detected by the voltage controller and the output value of the voltage controller and is applied to the converter section as a current control signal vibrates, the vibration A vibration determination voltage setting device that sets a voltage for determination, compares the voltage detected by the DC voltage detection circuit and the voltage set by the vibration determination voltage setting device, and the detected voltage compares the set voltage. When exceeding, a deviation amplifier that amplifies the deviation of both voltages and outputs it as a rectangular wave voltage, and the voltage controller based on the rectangular wave voltage output by the deviation amplifier It is determined whether or not the proportional gain should be reduced and the integration time of the current controller should be extended. When it is determined that it should be extended, the proportional gain is reduced by a predetermined value and the proportional gain is reduced. And a gain determination unit that outputs a signal that extends the integration time of the current controller by a predetermined value.

In the converter device according to the seventh aspect of the present invention, the gain determination unit reduces the proportional gain of the voltage controller of the integrator for integrating the rectangular wave voltage output by the deviation amplifier and the voltage output by the integrator, Moreover, when the level setter that sets the level for extending the integration time of the current controller is compared with the level set by the level setter and the voltage output by the integrator, when the voltage reaches the level. And a signal for reducing the proportional gain by a predetermined value and extending the integration time of the current controller by a predetermined value, and resetting the integrator.
And a comparator.

In the converter device according to the eighth aspect of the present invention, the gain determination unit reduces the proportional gain of the counter for counting the rectangular wave voltage output by the deviation amplifier and the count value of the counter for the voltage controller, A judgment value setter that sets a judgment value for extending the integration time of the controller, compares the judgment value set by the judgment value setter with the count value of the counter, and the count value reaches the judgment value. At this time, a sixth comparator outputs a signal for reducing the proportional gain by a predetermined value and extending the integration time of the current controller by a predetermined value, and when the sixth comparator outputs the signal and the deviation amplifier. And a reset circuit that resets the counter when the rectangular wave voltage output by the input terminal is not input for a predetermined time.

In the converter device according to the ninth aspect of the present invention, the gain determination section counts the rectangular wave voltage output by the deviation amplifier,
Further, an up / down counter having a clock generator and counting down the clock generated by the clock generator, and a proportional gain of the voltage controller of the count value of the up / down counter are reduced, and further, an integration time of the current controller is reduced. Is compared with the judgment value setter for setting the judgment value for extending the judgment value and the judgment value set by the judgment value setter, and when the count value reaches the judgment value. A seventh comparator which outputs a signal for reducing the proportional gain by a predetermined value and extending the integration time of the current controller by a predetermined value, and when the seventh comparator outputs the signal and the deviation amplifier outputs A reset that causes the up / down counter to start counting down the clock when the rectangular wave voltage is not input for a predetermined time. Characterized in that it comprises a road.

A converter device according to a tenth aspect of the present invention comprises a converter section for supplying DC power converted from AC power,
A DC voltage detection circuit for detecting a DC voltage output by the converter unit, a reference circuit for outputting a reference value of the DC voltage, a reference value output by the reference circuit and a DC voltage value detected by the DC voltage detection circuit. A voltage controller that amplifies and outputs the deviation of, a current detector that detects the input current to the converter unit, amplifies the deviation between the current value detected by the current detector and the output value of the voltage controller, and A current controller to be provided as a control signal to the converter section, a vibration determination voltage setting device that sets a voltage for determining the vibration when the voltage detected by the DC voltage detection circuit vibrates, and the DC voltage detection circuit Compares the detected voltage with the voltage set by the vibration determination voltage setting device, and outputs an ON signal when the detected voltage exceeds the set voltage. An eighth comparator, a relay that is turned on by an ON signal output from the eighth comparator, a signal generator that generates a predetermined voltage signal when the relay is on, and a signal generator that is generated by the signal generator. The proportional gain of the voltage controller is reduced based on the voltage signal, and it is determined whether or not the integration time of the current controller should be extended, and when it is determined that it should be extended, And a gain determination unit that outputs a signal that reduces the proportional gain by a predetermined value and extends the integration time of the current controller by a predetermined value.

In the converter device according to the eleventh aspect of the invention, the gain determination unit reduces the proportional gain of the voltage controller of the integrator that integrates the voltage signal output by the signal generator and the voltage output by the integrator, Moreover, when the level setter that sets the level for extending the integration time of the current controller is compared with the level set by the level setter and the voltage output by the integrator, when the voltage reaches the level. And a signal for reducing the proportional gain by a predetermined value and extending the integration time of the current controller by a predetermined value, and resetting the integrator.
And a comparator.

In the converter device according to the twelfth aspect of the present invention, the gain determining unit reduces the proportional gain of the counter for counting the voltage signals output by the signal generator and the count value of the counter for the voltage controller, A judgment value setter that sets a judgment value for extending the integration time of the controller, compares the judgment value set by the judgment value setter with the count value of the counter, and the count value reaches the judgment value. Sometimes, a signal for reducing the proportional gain by a predetermined value and extending the integration time of the current controller by a predetermined value is output, and further, the counter is reset.
And a comparator.

In the converter device according to the thirteenth invention, the gain determination section counts the voltage signal output from the signal generator,
Moreover, an up / down counter that has a clock generator and counts down the clock generated by the clock generator, and a proportional gain of the voltage controller of the count value of the up / down counter are reduced, and the integration time of the current controller is reduced. Is compared with the judgment value setter for setting the judgment value for extending the judgment value and the judgment value set by the judgment value setter, and when the count value reaches the judgment value. An eleventh comparator for outputting a signal for reducing the proportional gain by a predetermined value and extending the integration time of the current controller by a predetermined value;
A reset circuit for causing the up-down counter to start counting down the clock when the one comparator outputs the signal and when the voltage signal output by the signal generator is not input for a predetermined time. .

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings showing the embodiments thereof. Embodiment 1. FIG. 1 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention. The converter device 27 includes a main circuit bridge 9 made of a semiconductor that rectifies the three-phase AC power supplied from the commercial AC power supply 1 into DC power and outputs the DC power. The DC power output by the main circuit bridge 9 is smoothed. It is applied to inverters 3, 4 and 5 each having a capacitor 18. Main circuit bridge 9-3
CT6 (Current Transformer) for detecting an alternating current is attached to each of the two-phase input lines of the phase input lines. The outputs of the two CT6 are given to the current detector 7 and the main circuit bridge 9 is connected. The input current to is detected.

The converter device 27 also includes a DC voltage detection circuit 8 which is connected between the output lines of the main circuit bridge 9 and detects the DC voltage output by the converter device 27.
The main circuit bridge 9, CT6 and DC voltage detection circuit 8 are
The converter main circuit 10 is configured.

The converter device 27 is also provided with the DC voltage value detected by the DC voltage detection circuit 8, and the reference DC from the reference circuit 11 which gives the DC voltage value and the reference value of the DC voltage output by the converter device 27. The voltage controller 12a that amplifies and outputs the deviation from the voltage value and the current value detected by the current detector 7 are given, and the deviation between this current value and the output of the voltage controller 12a is amplified and used as the main current control signal. Current controller 1 for circuit bridge 9
4a, the interlock circuit 25 that stops the main circuit bridge 9 (converter main circuit 10), and the current value detected by the current detector 7 are given, and this current value has reached the preset current value. Sometimes, it is provided with an overcurrent detection circuit 15 which gives a signal for stopping to the interlock circuit 25.

In the converter device 27, when the voltage value detected by the DC voltage detection circuit 8 vibrates (hunts), a vibration (hunting) determination voltage setter 19 sets a voltage value for determining the vibration. And the voltage value detected by the DC voltage detection circuit 8 and the hunting determination voltage setter 19
Comparator 20 that compares the voltage value set by the above and outputs a voltage according to the amount by which the detected voltage value exceeds the set voltage value.
(First comparator).

The converter device 27 also includes a comparator 20.
An integrator 21 that integrates the voltage output by the voltage controller 12 and a level setter 22 that sets a level for reducing the proportional gain of the voltage controller 12a of the voltage output by the integrator 21 and extending the integration time of the current controller 14a. , The level set by the level setter 22 is compared with the voltage output by the integrator 21, and when the voltage reaches the level, the proportional gain of the voltage controller 12a is reduced,
Comparator 2 that outputs a signal for extending the integration time of the current controller 14a and a signal for resetting the integrator 21
3 (second comparator).

Further, the converter device 27 receives the signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a, and then the gain correction circuit 24 for reducing the proportional gain of the voltage controller 12a by a predetermined value. And an integration time correction circuit 26 for receiving the signal and extending the integration time of the current controller 14a by a predetermined value.

The operation of the converter device 27 having such a configuration will be described below. The converter device 27 supplies direct-current power to the voltage source inverters 3 to 5 including the capacitor load 18, and controls the direct-current voltage to be constant against variations in the load. That is, the output voltage is controlled by the voltage controller 12a so that it becomes the reference DC voltage value output by the reference circuit 11.

When the load includes the capacitor 18, for example, if the load of the inverter 3 increases and a large amount of current flows, the charge of the capacitor 18 decreases and the DC voltage instantaneously decreases. Since the voltage controller 12a amplifies the deviation between the detection value of the DC voltage detection circuit 8 and the reference DC voltage value and uses it as a current instruction signal, when the load of the inverter 3 suddenly increases, the detection value of the DC voltage detection circuit 8 is increased. And the reference DC voltage value increase, and the reference current value output to the current controller 14 increases. Therefore, the current instruction value given to the main circuit bridge 9 by the current controller 14 increases, and the main circuit bridge 9 supplies a large amount of current to the capacitor 18 to reduce the fluctuation of the DC voltage detected by the DC voltage detection circuit 8. To operate.

The overcurrent detection circuit 15 gives a signal for stopping to the interlock circuit 25 when the current value from the current detector 7 reaches a preset overcurrent value,
The interlock circuit 25 stops the main circuit bridge 9 and the converter main circuit 10 to protect the constituent devices.

The amplification factor of the voltage controller 12a is calculated based on the capacity of the capacitor 18 or the like serving as a load, and is set so that the control system of the DC voltage is stable. Here, when the capacitance of the capacitor 18 changes, particularly when it decreases, the amplification factor becomes relatively high with respect to the capacitance of the capacitor 18, and hunting between overshoot and undershoot is repeated.

In this case, if the voltage value detected by the DC voltage detection circuit 8 continues hunting, the comparator 2
0 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19, and outputs a voltage corresponding to the amount by which the detected voltage value exceeds the set voltage value. . The voltage output from the comparator 20 is the integrator 21.
Is integrated and output by. The voltage integrated and output by the integrator 21 is compared with the level set by the level setter 22 by the comparator 23, and when the level is reached, the comparator 23 reduces the proportional gain of the voltage controller 12a. , A signal for extending the integration time of the current controller 14a is supplied to the gain correction circuit 24 and the integration time correction circuit 26, and a signal for resetting the integrator 21 is supplied to the integrator 21.
Give to each.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14a
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. Integrator 21
Receives a signal for resetting the integrator 21 and resets it.

Even if the converter device 27 reduces the proportional gain of the voltage controller 12a by a predetermined value and extends the integration time of the current controller 14a by a predetermined value, the voltage value detected by the DC voltage detection circuit 8 causes hunting. If it continues, the above-described operation is repeated until the voltage integrated and output by the integrator 21 does not reach the level set by the level setter 22, and the temperature of the load capacitor 18 rises due to the ripple current. Prevents damage.

The detection time of the hunting operation varies depending on the amount of voltage exceeding the voltage value set by the hunting determination voltage setter 19 and its frequency. This is because the integrator 21 is used to operate when the integrated value exceeds the level set by the level setter 22, and if the ripple is large, the detection time becomes short, If the ripple is small, the detection time will be long. The detection time also varies depending on the frequency of the hunting operation.
However, the capacitor 18 can be protected by appropriately setting the set level of the level setter 22 according to the characteristics of the capacitor 18. As a result, the converter device 27 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and can protect the constituent devices.

Embodiment 2. FIG. 2 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. In this converter device 34, the comparator 20 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setter 19, and the detected voltage value exceeds the set voltage value. The voltage output according to the minutes
Waveform shaping circuit 28 for shaping a rectangular wave and waveform shaping circuit 2
And a counter 29 for counting the rectangular waves output by

The converter device 34 also includes a counter 2
The determination value setter 30 for setting the determination value for reducing the proportional gain of the voltage controller 12a of the count value of 9 and extending the integration time of the current controller 14a, and the determination value and the counter set by the determination value setting device 30. And a counter 29 for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a when the count value reaches the judgment value.
And a comparator 31 (third comparator) that outputs a signal for resetting the.

Further, the converter device 34 receives the signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a, and then the gain correction circuit 24 for reducing the proportional gain of the voltage controller 12a by a predetermined value. And an integration time correction circuit 2 for receiving the signal and extending the integration time of the current controller 14a.
6 and. Other configurations are the same as the configurations of converter device 27 described in the first embodiment, and description thereof will be omitted.

The operation of the converter device 34 having such a configuration will be described below. In the converter device 34, the comparator 20 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19,
A voltage corresponding to the detected voltage value exceeding the set voltage value is output. The waveform shaping circuit 28 shapes the voltage output from the comparator 20 into a rectangular wave and outputs the rectangular wave. Counter 29
Counts the rectangular wave output from the waveform shaping circuit 28.

The comparator 31 compares the count value of the counter 29 with the judgment value set by the judgment value setting device 30, and when the count value reaches the judgment value, reduces the proportional gain of the voltage controller 12a, A signal for extending the integration time of the current controller 14a is given to the gain correction circuit 24 and the integration time correction circuit 26, and a signal for resetting the counter 29 is given to the counter 29, respectively.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. Counter 2
9 receives a signal for resetting the counter 29 and resets it.

Even if the converter device 34 reduces the proportional gain of the voltage controller 12a by a predetermined value and extends the integration time of the current controller 14a by a predetermined value, the voltage value detected by the DC voltage detection circuit 8 causes hunting. If it continues, the above-described operation is repeated until the count value of the counter 29 does not reach the count value set by the determination value setting unit 30, and the temperature of the load capacitor 18 is increased by the ripple current and damaged. Prevent. Other operations are performed by the converter device 27 described in the first embodiment.
Since the operation is the same as the above, the description will be omitted.

As a result, the converter device 34 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and can protect the constituent devices. . Also, the comparator 2
Since the waveform of the output voltage of 0 is shaped into a rectangular wave by the waveform shaping circuit 28 and is counted by the counter 29, if the hunting frequency is the same, the detection time of the hunting operation is the voltage detected by the DC voltage detection circuit 8. It is almost the same regardless of the value.

Embodiment 3. FIG. 3 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention. In this converter device 42, the comparator 20 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19, and the detected voltage value exceeds the set voltage value. The voltage output according to the minutes
Waveform shaping circuit 35 for shaping a rectangular wave and waveform shaping circuit 3
5 is provided with a counter 37 for counting the rectangular wave output by the waveform shaping circuit 35 and a reset circuit 36 for resetting the counter 37 when the rectangular wave output by the waveform shaping circuit 35 is not input for a predetermined time.

The converter device 42 also includes a counter 3
The judgment value setter 30 for setting the judgment value for reducing the proportional gain of the voltage controller 12a of the count value of 7 and extending the integration time of the current controller 14a, and the judgment value and the counter set by the judgment value setting device 30. A signal and a counter 37 for comparing the count value of 37 and reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a when the count value reaches the judgment value.
And a comparator 39 (third comparator) that outputs a signal for resetting.

In addition, the converter device 42 receives a signal that reduces the proportional gain of the voltage controller 12a and extends the integration time of the current controller 14a, and reduces the proportional gain of the voltage controller 12a by a predetermined value. And an integration time correction circuit 2 for receiving the signal and extending the integration time of the current controller 14a.
6 and. Other configurations are the same as the configurations of converter device 27 described in the first embodiment, and description thereof will be omitted.

The operation of the converter device 42 having such a configuration will be described below. In the converter device 42, the comparator 20 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19,
A voltage corresponding to the detected voltage value exceeding the set voltage value is output. The waveform shaping circuit 35 shapes the voltage output from the comparator 20 into a rectangular wave and outputs the rectangular wave. Counter 37
Counts the rectangular wave output from the waveform shaping circuit 35. On the other hand, the reset circuit 36 resets the counter 37 when the rectangular wave output from the waveform shaping circuit 35 is not input for a predetermined time.

The comparator 39 compares the count value of the counter 37 with the judgment value set by the judgment value setting device 30, and when the count value reaches the judgment value, reduces the proportional gain of the voltage controller 12a. A signal for extending the integration time of the current controller 14a is given to the gain correction circuit 24 and the integration time correction circuit 26, and a signal for resetting the counter 37 is given to the reset circuit 36, respectively.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. The reset circuit 36 receives the signal for resetting the counter 37 and resets the counter 37.

In the converter device 42, even if the proportional gain of the voltage controller 12a is reduced by a predetermined value and the integration time of the current controller 14a is extended by a predetermined value, the voltage value detected by the DC voltage detection circuit 8 causes hunting. If it continues, the above-described operation is repeated until the count value of the counter 37 reaches the count value set by the judgment value setting unit 30, and the temperature of the load capacitor 18 is increased due to the ripple current and damaged. Prevent. Other operations are performed by the converter device 27 described in the first embodiment.
Since the operation is the same as the above, the description will be omitted.

As a result of the above, the converter device 42 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and the constituent devices can be protected. . Also, the comparator 2
Since the waveform of the output voltage of 0 is shaped into a rectangular wave by the waveform shaping circuit 35 and is counted by the counter 37, if the hunting frequency is the same, the detection time of the hunting operation is the voltage detected by the DC voltage detection circuit 8. When the hunting does not continue regardless of the value and the hunting does not continue for a certain period of time, the counter 37 is reset. It can be distinguished from hunting due to fluctuation.

Fourth Embodiment FIG. 4 is a block diagram showing a configuration of an embodiment of the converter device according to the present invention. In this converter device 48, the comparator 20 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setter 19, and the detected voltage value exceeds the set voltage value. The voltage output according to the minutes
An up / down counter 43 which has a waveform shaping circuit 35 for shaping a rectangular wave and a clock generator (not shown), counts the rectangular wave output by the waveform shaping circuit 35, and counts down the clock generated by the clock generator. And a reset circuit 36 that causes the up-down counter 43 to start clock countdown when the rectangular wave output from the waveform shaping circuit 35 is not input for a predetermined time.

The converter device 48 also reduces the proportional gain of the count value of the up / down counter 43 of the voltage controller 12a and sets the judgment value setter 3 for setting the judgment value for extending the integration time of the current controller 14a.
0 and the judgment value set by the judgment value setter 30 and the count value of the up / down counter 43 are compared, and when the count value reaches the judgment value, the proportional gain of the voltage controller 12a is reduced, and the current controller 14a And a comparator 45 (fourth comparator) that outputs a signal for extending the integration time of and the signal for resetting the up / down counter 43, respectively.

Further, the converter device 48 receives the signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a, and then the gain correction circuit 24 for reducing the proportional gain of the voltage controller 12a by a predetermined value. And an integration time correction circuit 26 for receiving the signal and extending the integration time of the current controller 14a by a predetermined value.

The reset circuit 36 receives the signal for resetting the up / down counter 43, and causes the up / down counter 43 to start clock countdown.
Other configurations are the same as the configurations of converter device 27 described in the first embodiment, and description thereof will be omitted.

The operation of the converter device 48 having such a configuration will be described below. In the converter device 48, the comparator 20 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19,
A voltage corresponding to the detected voltage value exceeding the set voltage value is output. The waveform shaping circuit 35 shapes this voltage output from the comparator 20 into a rectangular wave and outputs it, and the up / down counter 43 counts the rectangular wave output from the waveform shaping circuit 35.

On the other hand, the reset circuit 36, when the rectangular wave output from the waveform shaping circuit 35 is not input for a predetermined time,
The up / down counter 43 starts counting down the clock. The up-down counter 43 terminates the countdown when it counts down to 0, and when the rectangular wave is input from the waveform shaping circuit 35 during the countdown, stops the countdown and returns the count value at that time. Start counting from.

The comparator 45 includes an up / down counter 43.
Of the current controller 14 is compared with the judgment value set by the judgment value setter 30, and when the count value reaches the judgment value, the proportional gain of the voltage controller 12a is reduced.
A signal for extending the integration time of a is sent to the gain correction circuit 24 and the integration time correction circuit 26 by the up / down counter 43.
The reset signal is output to the reset circuit 36.

The gain correction circuit 24 receives the signal for reducing the proportional gain of the voltage controller 12a and reduces the proportional gain of the voltage controller 12a by a predetermined value.
The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. The reset circuit 36 receives the signal for resetting the up / down counter 43 and causes the up / down counter 43 to start clock countdown. Other operations are
Since the operation is the same as that of converter device 27 described in the first embodiment, description thereof will be omitted.

As a result, the converter device 48 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and can protect the constituent devices. . Also, the comparator 2
Since the waveform of the output voltage of 0 is shaped into a rectangular wave by the waveform shaping circuit 35 and is counted by the up / down counter 43, if the hunting frequency is the same, the DC voltage detection circuit 8 detects the hunting operation detection time. It becomes almost the same regardless of the applied voltage value.

When the hunting does not continue for a certain period of time, the up / down counter 43 starts counting down the clock. Therefore, even if the hunting occurs temporarily due to the load behavior of the inverters 3 to 5, the capacitance of the capacitor 18 is increased. It can be distinguished from hunting due to fluctuation, and when a rectangular wave is input before the countdown ends, the countdown is stopped and the counting is started from the count value at that time. Even if the hunting repeatedly occurs in a short time due to the behavior of the load, it can be distinguished from the hunting due to the capacitance variation of the capacitor 18.

Embodiment 5. FIG. 5 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. When the DC voltage value detected by the DC voltage detection circuit 8 hunts, this converter device 55 is detected by the DC voltage detection circuit 8 and the hunting judgment voltage setter 19 that sets a voltage value for judging the hunting. The voltage value set by the hunting determination voltage setter 19 is compared, and when the detected voltage value exceeds the set voltage value, the deviation between both voltage values is amplified and output as a rectangular wave voltage. And an amplifier 49.

The converter device 55 also reduces the proportional gain of the voltage controller 12a of the voltage output by the integrator 50 and the integrator 50 for integrating the rectangular wave voltage output by the deviation amplifier 49, thereby reducing the current controller 14a. Level setter 2 for setting the level for extending the integration time
2, the level set by the level setter 22 and the integrator 50
When the voltage reaches the level, a signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a and a signal for resetting the integrator 50 are respectively compared. And a comparator 52 (fifth comparator) for outputting.

Further, the converter device 55 receives a signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a, and reduces the proportional gain of the voltage controller 12a by a predetermined value. And an integration time correction circuit 26 for receiving the signal and extending the integration time of the current controller 14a by a predetermined value. Other configurations are the same as the configurations of converter device 27 described in the first embodiment, and description thereof will be omitted.

The operation of the converter device 55 having such a configuration will be described below. When the voltage value detected by the DC voltage detection circuit 8 continues hunting, the deviation amplifier 49 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setter 19. Then
When the detected voltage value exceeds the set voltage value, the deviation between the two voltage values is amplified and output as a rectangular wave.

The rectangular wave voltage output from the deviation amplifier 49 is
It is integrated by the integrator 50 and output. The voltage output from the integrator 50 is compared with the level set by the level setter 22 by the comparator 52, and when the level is reached, the comparator 52 reduces the proportional gain of the voltage controller 12a to reduce the current. The signal for extending the integration time of the controller 14a is sent to the gain correction circuit 24 and the integration time correction circuit 26, and the signal for resetting the integrator 50 is sent to the integrator 5.
Output to 0 respectively.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. Other operations are performed by the converter device 2 described in the first embodiment.
Since the operation is the same as that of 7, the description thereof will be omitted. As a result, the converter device 55 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and can protect the constituent devices.

Sixth Embodiment FIG. 6 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. The converter device 63 includes a counter 58 for counting the rectangular wave voltage output from the deviation amplifier 56, and a counter 5
The determination value setter 30 for setting the determination value for reducing the proportional gain of the voltage controller 12a of the count value of 8 and extending the integration time of the current controller 14a, and the determination value and the counter set by the determination value setting device 30. A signal and counter 58 that compares the count value of 58 and reduces the proportional gain of the voltage controller 12a and extends the integration time of the current controller 14a when the count value reaches the determination value.
Comparators 60 for outputting signals for resetting
(Sixth comparator).

The converter device 63 also receives a signal that reduces the proportional gain of the voltage controller 12a and extends the integration time of the current controller 14a, and reduces the proportional gain of the voltage controller 12a by a predetermined value. 24, the integration time correction circuit 26 that receives the signal and extends the integration time of the current controller 14a by a predetermined value, and the rectangular wave voltage output by the deviation amplifier 56 when the signal that resets the counter 58 is received. A reset circuit 57 is provided for resetting the counter 58 when no time is input. Other configurations are the same as the converter device 55 described in the fifth embodiment.
Since the configuration is the same as that of 1, the description thereof will be omitted.

The operation of the converter device 63 having such a configuration will be described below. When the deviation amplifier 56 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19, the converter device 63 detects that the detected voltage value exceeds the set voltage value. Is
The deviation between the two voltage values is amplified and output as a rectangular wave.
The counter 58 counts the rectangular wave voltage output by the deviation amplifier 56. On the other hand, the reset circuit 57 includes the deviation amplifier 5
When the rectangular wave output by 6 is not input for a predetermined time, the counter 58 is reset.

The comparator 60 compares the count value of the counter 58 with the judgment value set by the judgment value setting device 30. When the count value reaches the judgment value, the proportional gain of the voltage controller 12a is reduced, A signal for extending the integration time of the current controller 14a is output to the gain correction circuit 24 and the integration time correction circuit 26, and a signal for resetting the counter 58 is output to the reset circuit 57, respectively.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14a
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. The reset circuit 57 receives the signal for resetting the counter 58 and resets the counter 58. Other operations are
Since the operation is the same as that of converter device 55 described in the fifth embodiment, description thereof will be omitted.

As a result, the converter device 63 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and can protect the constituent devices. . Further, since the deviation amplifier 56 shapes the output voltage into a rectangular wave and counts it with the counter 58, if the hunting frequency is the same,
The detection time of the hunting operation becomes substantially the same regardless of the voltage value detected by the DC voltage detection circuit 8, and the counter 58 is reset when the hunting does not continue for a certain period of time. Even if hunting occurs temporarily due to the behavior, it can be distinguished from hunting due to the capacitance variation of the capacitor 18.

Seventh Embodiment FIG. 7 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. The converter device 70 includes an up / down counter 6
It is equipped with 5. The up / down counter 65 counts the rectangular wave voltage output by the deviation amplifier 56, and has a clock generator (not shown), and counts down the clock generated by the clock generator.

The converter device 70 also reduces the proportional gain of the count value of the up / down counter 65 of the voltage controller 12a and sets the judgment value setting unit 3 for setting the judgment value for extending the integration time of the current controller 14a.
0 and the judgment value set by the judgment value setting unit 30 and the count value of the up / down counter 65 are compared, and when the count value reaches the judgment value, the proportional gain of the voltage controller 12a is reduced, and the current controller 14a And a comparator 67 (seventh comparator) that outputs a signal for extending the integration time and a signal for resetting the counter 58, respectively.

Further, the converter device 70 receives a signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a, and then the gain correction circuit 24 for reducing the proportional gain of the voltage controller 12a by a predetermined value. When receiving the signal, the integration time correction circuit 26 for extending the integration time of the current controller 14a by a predetermined value, and the rectangular wave voltage output by the deviation amplifier 56 when the signal for resetting the up / down counter 65 is received. A reset circuit 64 is provided which causes the up / down counter 65 to start counting down the clock when no input is made for a predetermined time. Other configurations are similar to those of converter device 55 described in the fifth embodiment, and therefore description thereof will be omitted.

The operation of the converter device 70 having such a configuration will be described below. When the deviation amplifier 56 compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19, the converter device 70 detects that the detected voltage value exceeds the set voltage value. Is
The deviation between the two voltage values is amplified and output as a rectangular wave.
The up / down counter 65 counts the rectangular wave output by the deviation amplifier 56.

On the other hand, the reset circuit 64 includes the deviation amplifier 5
When the rectangular wave output by 6 is not input for a predetermined time, the up / down counter 65 starts counting down the clock. The up-down counter 65 terminates the countdown when it counts down to 0, and when the rectangular wave is input from the deviation amplifier 56 during the countdown, stops the countdown and restarts from the count value at that time. Start counting.

The comparator 67 includes an up / down counter 65.
Of the current controller 14 is compared with the judgment value set by the judgment value setter 30, and when the count value reaches the judgment value, the proportional gain of the voltage controller 12a is reduced.
A signal for extending the integration time of a is sent to the gain correction circuit 24 and the integration time correction circuit 26 by the up / down counter 65.
The reset signal is output to the reset circuit 64.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14a
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. The reset circuit 64 receives the signal for resetting the up / down counter 65 and causes the up / down counter 65 to start counting down the clock. Other operations are the same as the operations of converter device 55 described in the fifth embodiment, and therefore description thereof will be omitted.

As a result, the converter device 70 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and protect the constituent devices. . Further, since the deviation amplifier 56 shapes the output voltage into a rectangular wave and counts it with the up / down counter 65, if the hunting frequency is the same, the detection time of the hunting operation is the voltage value detected by the DC voltage detection circuit 8. It is almost the same regardless of.

When the hunting does not continue for a certain period of time, the up / down counter 65 starts counting down the clock. Therefore, even if the hunting occurs temporarily due to the load behavior of the inverters 3 to 5, the capacitance of the capacitor 18 is increased. This can be distinguished from hunting due to fluctuations, and when a rectangular wave is input before the countdown ends, the countdown is stopped and counting is started from the count value at that time. Even if the hunting repeatedly occurs in a short time due to the behavior of the load, it can be distinguished from the hunting due to the capacitance variation of the capacitor 18.

Eighth Embodiment FIG. 8 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. The converter device 81 includes a hunting determination voltage setter 19 that sets a voltage for determining hunting when the voltage value detected by the DC voltage detection circuit 8 hunts, and a voltage detected by the DC voltage detection circuit 8. The value is compared with the voltage value set by the hunting determination voltage setter 19 and compared with a comparator 71 (eighth comparator) that outputs an ON signal when the detected voltage value exceeds the set voltage value. Relay 73 that is turned on by the ON signal output from the device 71
A (relay contact 74) and a signal generator 72 that generates a predetermined voltage signal when the relay 73 is turned on are provided. Comparator 71, relay 73 and signal generator 72
Constitutes an insulation comparator 75.

The converter device 81 also reduces the proportional gain of the voltage controller 12a for the voltage output by the integrator 76 and the integrator 76 for integrating the voltage signal output by the signal generator 72, and the current controller 14a outputs the proportional gain. Level setter 22 for setting a level for extending the integration time
And the voltage set by the level setter 22 is compared with the voltage output by the integrator 76, and when the voltage reaches the level, the proportional gain of the voltage controller 12a is reduced and the integration time of the current controller 14a is reduced. And a comparator 78 (ninth comparator) that outputs a signal for extending the signal and a signal for resetting the integrator 76, respectively.

Further, the converter device 81 receives the signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a, and the gain correction circuit 24 for reducing the proportional gain of the voltage controller 12a by a predetermined value. And an integration time correction circuit 26 for receiving the signal and extending the integration time of the current controller 14a by a predetermined value. Other configurations are the same as the configurations of converter device 27 described in the first embodiment, and description thereof will be omitted.

The operation of the converter device 81 having such a configuration will be described below. When the voltage value detected by the DC voltage detection circuit 8 continues hunting, the comparator 71
Compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19, and outputs an ON signal when the detected voltage value exceeds the set voltage value. The relay 73 is turned on by the ON signal output from the comparator 71, and the signal generator 72 outputs a predetermined voltage signal when the relay 73 is turned on.

The voltage signal output from the signal generator 72 is integrated by the integrator 76 and output. The voltage output from the integrator 76 is compared with the level set by the level setter 22 by the comparator 78, and when the level is reached,
The comparator 78 outputs a signal for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a to the gain correction circuit 24 and the integration time correction circuit 26.
Then, a signal for resetting the integrator 76 is output to the integrator 76, respectively.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14a
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. Integrator 76
Receives a signal for resetting the integrator 76 and resets it. Other operations are the same as the operations of converter device 27 described in the first embodiment, and therefore description thereof will be omitted.

As a result of the above, when the voltage value detected by the DC voltage detection circuit 8 continues hunting, the converter device 81 can detect and suppress the hunting and protect the constituent devices. Also, the comparator 7
1, the relay 73 and the signal generator 72, the integrator 76
The subsequent protection circuit and the DC voltage detection circuit 8 can be insulated, the output voltage of the signal generator 72 is shaped into a rectangular wave by the relay 73, and integrated by the integrator 76. Therefore, if the hunting frequency is the same, hunting is performed. The operation detection time is substantially the same regardless of the voltage value detected by the DC voltage detection circuit 8.

Ninth Embodiment FIG. 9 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. The converter device 87 includes a counter 82 that counts the voltage signal output from the signal generator 72, and a counter 82.
Determination value setter 30 for setting the determination value for reducing the proportional gain of the voltage controller 12a and extending the integration time of the current controller 14a, the determination value set by the determination value setting device 30, and the counter 82 Compares the count value counted by the above, and when the count value reaches the determination value, reduces the proportional gain of the voltage controller 12a,
A comparator 84 (tenth comparator) for outputting a signal for extending the integration time of the current controller 14a and a signal for resetting the counter 82, respectively.

The converter device 87 also receives a signal that reduces the proportional gain of the voltage controller 12a and extends the integration time of the current controller 14a, and reduces the proportional gain of the voltage controller 12a by a predetermined value. And an integration time correction circuit 26 for receiving the signal and extending the integration time of the current controller 14a by a predetermined value. Other configurations are the same as the configurations of converter device 81 described in the eighth embodiment, and description thereof will be omitted.

The operation of the converter device 87 having such a configuration will be described below. When the voltage value detected by the DC voltage detection circuit 8 continues hunting, the comparator 71
Compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19, and outputs an ON signal when the detected voltage value exceeds the set voltage value. The relay 73 is turned on by the ON signal output from the comparator 71, and the signal generator 72 outputs a predetermined voltage signal when the relay 73 is turned on. The counter 82 counts the voltage signal that is a rectangular wave output from the signal generator 72.

The comparator 84 compares the count value of the counter 82 with the judgment value set by the judgment value setting device 30, and when the count value reaches the judgment value, reduces the proportional gain of the voltage controller 12a, A signal for extending the integration time of the current controller 14a is output to the gain correction circuit 24 and the integration time correction circuit 26, and a signal for resetting the counter 82 is output to the counter 82, respectively.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14a
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. Counter 8
2 receives the signal for resetting the counter 82 and resets it. Other operations are the same as the operations of converter device 80 described in the eighth embodiment, and therefore description thereof will be omitted.

As a result of the above, the converter device 87 can detect and suppress the hunting when the voltage value detected by the DC voltage detection circuit 8 continues the hunting, and the constituent devices can be protected. . Also, the comparator 7
1, the relay 73 and the signal generator 72, the counter 8
The protection circuit after 2 and the DC voltage detection circuit 8 can be insulated,
Since the output voltage of the signal generator 72 is shaped into a rectangular wave by the relay 73 and is counted by the counter 82, if the hunting frequency is the same, the detection time of the hunting operation is the voltage value detected by the DC voltage detection circuit 8. It is almost the same regardless of.

Embodiment 10. FIG. 10 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. The converter device 94 includes an up / down counter 88. The up / down counter 88 counts the voltage signal output from the signal generator 72, and has a clock generator (not shown), and counts down the clock generated by the clock generator.

The converter device 94 also reduces the proportional gain of the count value of the up / down counter 88 of the voltage controller 12a and sets the judgment value setter 3 for setting the judgment value for extending the integration time of the current controller 14a.
0 is compared with the judgment value set by the judgment value setter 30 and the count value counted by the up / down counter 88, and when the count value reaches the judgment value, the voltage controller 12
a signal for reducing the proportional gain of a and extending the integration time of the current controller 14a, and the up / down counter 8
Comparator 91 for outputting a signal for resetting 8 respectively
(11th comparator).

The converter device 94 also receives a signal that reduces the proportional gain of the voltage controller 12a and extends the integration time of the current controller 14a, and reduces the proportional gain of the voltage controller 12a by a predetermined value. 24, an integration time correction circuit 26 that receives the signal and extends the integration time of the current controller 14a by a predetermined value, and resets the up / down counter 88 when the voltage signal output from the signal generator 72 is not input for the predetermined time. And a reset circuit 88 that causes the up / down counter 88 to start counting down the clock when receiving the signal. Other configurations are
Since the configuration is the same as that of converter device 81 described in the eighth embodiment, description thereof will be omitted.

The operation of the converter device 94 having such a configuration will be described below. When the voltage value detected by the DC voltage detection circuit 8 continues hunting, the comparator 71
Compares the voltage value detected by the DC voltage detection circuit 8 with the voltage value set by the hunting determination voltage setting device 19, and outputs an ON signal when the detected voltage value exceeds the set voltage value. The relay 73 is turned on by the ON signal output from the comparator 71, and the signal generator 72 outputs a predetermined voltage signal when the relay 73 is turned on. The up / down counter 88 counts the voltage signal that is a rectangular wave output from the signal generator 72.

On the other hand, the reset circuit 89 includes the signal generator 7
When the rectangular wave output by 2 is not input for a predetermined time, the up / down counter 88 starts the clock countdown. The up-down counter 88 terminates the countdown when it counts down to 0, and when the rectangular wave is input from the signal generator 72 while it is counting down, stops the countdown and returns the count value at that time. Start counting from.

The comparator 91 has an up / down counter 88.
Of the current controller 14 is compared with the judgment value set by the judgment value setter 30, and when the count value reaches the judgment value, the proportional gain of the voltage controller 12a is reduced.
A signal for extending the integration time of a is sent to the gain correction circuit 24 and the integration time correction circuit 26, and the up / down counter 88
The reset signal is output to the reset circuit 89.

The gain correction circuit 24 reduces the proportional gain of the voltage controller 12a, and the current controller 14a
The proportional gain of the voltage controller 12a is reduced by a predetermined value in response to the signal for extending the integration time of a. The integration time correction circuit 26 receives the signal and extends the integration time of the current controller 14a by a predetermined value. The reset circuit 89 receives the signal for resetting the up / down counter 88, and causes the up / down counter 88 to start clock countdown. Other operations are the same as the operations of converter device 81 described in the eighth embodiment, and therefore description thereof will be omitted.

As a result of the above, when the voltage value detected by the DC voltage detection circuit 8 continues to hunt, the converter device 94 can detect and suppress the hunting, and protect the constituent equipment. . Further, in the converter device 94, the protection circuit after the up / down counter 88 and the DC voltage detection circuit 8 can be insulated by the comparator 71, the relay 72, and the signal generator 72, and the output voltage of the signal generator 72 is relayed by the relay 73. Since the rectangular wave is formed and counted by the up / down counter 88, if the hunting frequency is the same, the detection time of the hunting operation becomes substantially the same regardless of the voltage value detected by the DC voltage detection circuit 8.

When the hunting does not continue for a certain period of time, the converter device 94 uses the up / down counter 8
Since the clock countdown is started by 8, even if the hunting occurs temporarily due to the behavior of the loads of the inverters 3 to 5, it can be distinguished from the hunting due to the capacitance variation of the capacitor 18, and before the countdown ends. , When the rectangular wave is input, the countdown is stopped and the counting is started from the count value at that time. Therefore, even if hunting occurs repeatedly in a short time due to the load behavior of the inverters 3 to 5, the capacitor 18 It can be distinguished from hunting due to capacity fluctuation.

[0107]

According to the converter device of the first aspect of the invention, the converter section supplies the DC power converted from the AC power, and the DC voltage detection circuit detects the DC voltage output from the converter section, and the reference circuit. Outputs the reference value of the DC voltage. The voltage controller amplifies and outputs the deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit. The current detector detects the input current to the converter unit, and the current controller amplifies the deviation between the current value detected by the current detector and the output value of the voltage controller, and supplies it to the converter unit as a current control signal. The vibration determination voltage setter sets a voltage for determining the vibration when the voltage detected by the DC voltage detection circuit vibrates, and the first comparator sets the voltage detected by the DC voltage detection circuit and the vibration determination. It compares the voltage set by the voltage setter and outputs a voltage corresponding to the amount by which the detected voltage exceeds the set voltage.

The gain judging section judges, based on the voltage output from the first comparator, whether or not the proportional gain of the voltage controller should be reduced, and further whether or not the integration time of the current controller should be extended. When it is determined that the voltage controller should be extended, a signal that reduces the proportional gain of the voltage controller by a predetermined value and extends the integration time of the current controller by a predetermined value is output. As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices.

According to the converter device of the second invention,
In the gain determination unit, the integrator integrates the voltage output by the first comparator, and the level setting unit outputs the voltage output by the integrator.
The level is set to reduce the proportional gain of the voltage controller and extend the integration time of the current controller. The second comparator compares the level set by the level setter with the voltage output by the integrator, and when the voltage reaches the level, the proportional gain of the voltage controller is reduced and the integration time of the current controller is reduced. Outputs a signal to extend the signal and resets the integrator. As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices.

According to the converter device of the third invention,
In the gain determination unit, the waveform shaping circuit shapes the output of the first comparator into a rectangular wave, the counter counts the rectangular wave output from the waveform shaping circuit, and the determination value setting unit determines the count value of the counter. The determination value is set to reduce the proportional gain of the voltage controller and extend the integration time of the current controller. The third comparator compares the judgment value set by the judgment value setter with the count value of the counter, and when the count value reaches the judgment value, reduces the proportional gain of the voltage controller and reduces the proportional gain of the current controller. It outputs a signal that extends the integration time and resets the counter. As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices. Further, if the hunting frequency is the same, the hunting operation detection time is substantially the same regardless of the voltage value.

According to the converter device of the fourth invention,
The reset circuit resets the counter when the rectangular wave output from the waveform shaping circuit is not input for a predetermined time.Therefore, even if hunting occurs temporarily due to the load behavior of the inverter, it may be It can be distinguished from hunting.

According to the converter device of the fifth invention,
In the gain determination unit, the waveform shaping circuit shapes the output of the first comparator into a rectangular wave, the up / down counter counts the rectangular wave output from the waveform shaping circuit, and counts down the clock generated by the clock generator. . The judgment value setter sets a judgment value for reducing the proportional gain of the voltage controller of the count value of the up / down counter and further extending the integration time of the current controller, and the fourth comparator is
The set judgment value is compared with the count value of the up / down counter, and when the count value reaches the judgment value, a signal for reducing the proportional gain of the voltage controller and extending the integration time of the current controller is output. To do. The reset circuit causes the up / down counter to start counting down the clock when the fourth comparator outputs this signal and when the rectangular wave output from the waveform shaping circuit is not input for a predetermined time.

As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices. Further, if the hunting frequency is the same, the hunting operation detection time is substantially the same regardless of the voltage value. Moreover, even if hunting occurs temporarily due to the behavior of the load of the inverter, it can be distinguished from hunting due to the capacitance variation of the capacitor that the load has, and due to the behavior of the load of the inverter, hunting occurs repeatedly in a short time. Also,
It can be distinguished from hunting due to capacitance fluctuation of the capacitor.

According to the converter device of the sixth invention,
The converter unit supplies the DC power converted from the AC power, the DC voltage detection circuit detects the DC voltage output from the converter unit, and the reference circuit outputs the reference value of the DC voltage. The voltage controller amplifies and outputs the deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit. The current detector detects the input current to the converter unit, and the current controller amplifies the deviation between the current value detected by the current detector and the output value of the voltage controller, and supplies it to the converter unit as a current control signal. The vibration judgment voltage setting device sets the voltage for judging the vibration when the voltage detected by the DC voltage detection circuit vibrates, and the deviation amplifier sets the voltage detected by the DC voltage detection circuit and the vibration judgment voltage setting. When the detected voltage exceeds the set voltage, the deviation between the two voltages is amplified and output as a rectangular wave voltage.

The gain determination unit reduces the proportional gain of the voltage controller based on the rectangular wave voltage output from the deviation amplifier, and further determines and reduces whether or not to extend the integration time of the current controller. When it is determined that the voltage controller should be extended, a signal that reduces the proportional gain of the voltage controller by a predetermined value and extends the integration time of the current controller by a predetermined value is output. As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices.

According to the converter device of the seventh invention,
In the gain determination unit, the integrator integrates the rectangular wave voltage output by the deviation amplifier, the level setter reduces the proportional gain of the voltage controller of the voltage output by the integrator, and further, the integration time of the current controller. Set the level to extend. The fifth comparator compares the level set by the level setter with the voltage output by the integrator, and when the voltage reaches the level, reduces the proportional gain of the voltage controller and reduces the integration time of the current controller. Outputs a signal to extend the signal and resets the integrator. As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices.

According to the converter device of the eighth invention,
In the gain determination unit, the counter counts the rectangular wave voltage output by the deviation amplifier, and the determination value setter reduces the proportional gain of the voltage controller of the count value of the counter, and further extends the integration time of the current controller. Set the judgment value that should be made. The sixth comparator compares the judgment value set by the judgment value setter with the count value of the counter, and when the count value reaches the judgment value, reduces the proportional gain of the voltage controller and reduces the proportional gain of the current controller. Outputs a signal that extends the integration time. The reset circuit resets the counter when the sixth comparator outputs this signal and when the rectangular wave voltage output by the deviation amplifier is not input for a predetermined time.

As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the components. If the hunting frequency is the same, the detection time of the hunting operation is substantially the same regardless of the voltage value, and even if the hunting occurs temporarily due to the load behavior of the inverter, the capacitor of the load has It can be distinguished from hunting due to capacity fluctuation.

According to the converter device of the ninth invention,
In the gain determination unit, the up / down counter counts the rectangular wave voltage output by the deviation amplifier, and also counts down the clock generated by the clock generator. A judgment value is set to reduce the proportional gain of the controller and extend the integration time of the current controller. The seventh comparator compares the judgment value set by the judgment value setter with the count value of the up / down counter, and when the count value reaches the judgment value, reduces the proportional gain of the voltage controller and reduces the current. Outputs a signal that extends the integration time of the controller. The reset circuit causes the up / down counter to start counting down the clock when the seventh comparator outputs this signal and when the rectangular wave voltage output from the deviation amplifier is not input for a predetermined time.

As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the components. Further, if the hunting frequency is the same, the hunting operation detection time is substantially the same regardless of the voltage value. Moreover, even if hunting occurs temporarily due to the behavior of the load of the inverter, it can be distinguished from hunting due to the capacitance variation of the capacitor that the load has, and due to the behavior of the load of the inverter, hunting occurs repeatedly in a short time. Also,
It can be distinguished from hunting due to capacitance fluctuation of the capacitor.

According to the converter device of the tenth aspect of the invention, the converter section supplies the DC power converted from the AC power, the DC voltage detection circuit detects the DC voltage output from the converter section, and the reference circuit: The reference value of the DC voltage is output. The voltage controller amplifies and outputs the deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit. The current detector detects the input current to the converter unit, and the current controller amplifies the deviation between the current value detected by the current detector and the output value of the voltage controller, and supplies it to the converter unit as a current control signal.
The vibration judgment voltage setting device sets a voltage for judging the vibration when the voltage detected by the DC voltage detection circuit vibrates, and the eighth comparator sets the voltage detected by the DC voltage detection circuit and the vibration judgment. It compares the voltage set by the voltage setting device and outputs an ON signal when the detected voltage exceeds the set voltage. The relay is turned on by the ON signal output from the eighth comparator, and generates a predetermined voltage signal when the signal generator semiconductor and the relay are turned on.

The gain judging section judges whether or not the proportional gain of the voltage controller should be reduced based on the voltage signal generated by the signal generator, and further, whether the integral time of the current controller should be extended or not. When the determination is made, a signal that reduces the proportional gain of the voltage controller by a predetermined value and extends the integration time of the current controller by a predetermined value is output. As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices. Also,
If the protection circuit and the DC voltage detection circuit can be insulated and the hunting frequency is the same, the detection time of the hunting operation is substantially the same regardless of the voltage value.

According to the converter device of the eleventh aspect of the present invention, in the gain determination unit, the integrator integrates the voltage signal output by the signal generator, and the level setting unit controls the voltage controller for the voltage output by the integrator. Is set to a level at which the proportional gain of is reduced and the integration time of the current controller is extended. The ninth comparator compares the level set by the level setter with the voltage output by the integrator, and when the voltage reaches the level, reduces the proportional gain of the voltage controller and reduces the integration time of the current controller. Outputs a signal to extend the signal and resets the integrator. As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the constituent devices. Further, if the protection circuit and the DC voltage detection circuit can be insulated and the hunting frequency is the same, the detection time of the hunting operation is substantially the same regardless of the voltage value.

According to the converter device of the twelfth aspect of the invention, in the gain judging section, the counter counts the voltage signal output by the signal generator, and the judgment value setting unit causes the count value of the counter to be proportional to the voltage controller. A judgment value is set to reduce the gain and extend the integration time of the current controller. The tenth comparator compares the judgment value set by the judgment value setter with the count value of the counter, and when the count value reaches the judgment value, reduces the proportional gain of the voltage controller and reduces the proportional gain of the current controller. It outputs a signal that extends the integration time and resets the counter. As a result, when the output voltage is at a low level and hunting continues, the hunting can be detected and suppressed to protect the constituent devices. Further, if the protection circuit and the DC voltage detection circuit can be insulated and the hunting frequency is the same, the detection time of the hunting operation is substantially the same regardless of the voltage value.

According to the converter apparatus of the thirteenth invention, in the gain judging section, the up / down counter counts the voltage signal output from the signal generator, and the clock generated by the clock generator is counted down to make a judgment. A value setter sets a judgment value for reducing the proportional gain of the voltage controller of the count value of the up / down counter and further extending the integration time of the current controller. First
The 1-comparator compares the judgment value set by the judgment value setting device with the count value of the up / down counter, and when the count value reaches the judgment value, the proportional gain of the voltage controller is reduced and the current controller Outputs a signal that extends the integration time of. The reset circuit causes the up / down counter to start counting down the clock when the eleventh comparator outputs this signal and when the voltage signal output by the signal generator is not input for a predetermined time.

As a result, when the output voltage continues to hunt at a low level, the hunting can be detected and suppressed to protect the components. Further, if the protection circuit and the DC voltage detection circuit can be insulated and the hunting frequency is the same, the detection time of the hunting operation is substantially the same regardless of the voltage value. Moreover, even if hunting occurs temporarily due to the behavior of the load of the inverter, it can be distinguished from hunting due to the fluctuation of the capacity of the capacitor of the load. Can be distinguished from hunting due to capacitance fluctuation of the capacitor.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 2 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 3 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 4 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 5 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 6 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 7 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 8 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 9 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 10 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention.

FIG. 11 is a block diagram showing a configuration example of a conventional converter device.

[Explanation of symbols]

1 Commercial AC power supply, 3-5 inverters, 6 CT, 7
Current detector, 8 DC voltage detection circuit, 10 converter main circuit (converter section), 11 reference circuit, 12a
Voltage controller, 14a Current controller, 18
(Smoothing) capacitor, 19 Hunting judgment voltage setting device (vibration judgment voltage setting device), 20, 23, 31, 39, 4
5,52,60,67,71,78,84,91 comparator, 21,50,76 integrator, 22 level setter,
24 gain correction circuit, 25 interlock circuit, 2
6 integration time correction circuit, 27, 34, 42, 48, 5
5,63,70,81,87,94 converter device,
28,35 waveform shaping circuit, 29,37,58,82
Counter, 30 Judgment value setting device, 36, 57, 64, 8
9 reset circuit, 43, 65, 88 up-down counter, 49, 56 deviation amplifier, 72 signal generator,
73 relays, 74 relay contacts, 75 insulation comparator.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02M 7/155

Claims (13)

(57) [Claims] 1. A converter unit for supplying DC power converted from AC power, a DC voltage detection circuit for detecting a DC voltage output by the converter unit, a reference circuit for outputting a reference value of the DC voltage, and A voltage controller that amplifies and outputs the deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit, a current detector that detects the input current to the converter unit, and the current detector When the voltage detected by the direct current voltage detection circuit and the current controller that amplifies the deviation between the detected current value and the output value of the voltage controller and gives the current control signal to the converter section, determines the vibration. The vibration determination voltage setter that sets the voltage for doing, compares the voltage detected by the DC voltage detection circuit and the voltage set by the vibration determination voltage setter, A first comparator that outputs a voltage corresponding to the amount by which the detected voltage exceeds the set voltage, and a proportional gain of the voltage controller is reduced based on the voltage output by the first comparator, and A signal that determines whether or not the integration time of the current controller should be extended, reduces it, and when it determines that it should be extended, reduces the proportional gain by a predetermined value and extends the integration time by a predetermined value. And a gain determination unit that outputs 2. The gain determination unit includes an integrator that integrates the voltage output by the first comparator and a voltage output by the integrator.
A level setter that reduces the proportional gain of the voltage controller and sets the level at which the integration time of the current controller should be extended, and compares the level set by the level setter and the voltage output by the integrator, A second comparator that, when the voltage reaches the level, outputs a signal that reduces the proportional gain by a predetermined value and extends the integration time by a predetermined value, and further resets the integrator. The converter device according to claim 1. 3. The gain determination unit includes a waveform shaping circuit that shapes the output of the first comparator into a rectangular wave, a counter that counts the rectangular wave output by the waveform shaping circuit, and a voltage of the count value of the counter. A judgment value setter for setting a judgment value for reducing the proportional gain of the controller and extending the integration time of the current controller is compared with the judgment value set by the judgment value setter and the count value of the counter. A third comparator which, when the count value reaches the judgment value, outputs a signal for reducing the proportional gain by a predetermined value and extending the integration time by a predetermined value, and further resets the counter. The converter device according to claim 1, further comprising: 4. The converter device according to claim 3, further comprising a reset circuit that resets the counter when the rectangular wave output from the waveform shaping circuit is not input for a predetermined time. 5. The gain determination unit has a waveform shaping circuit that shapes the output of the first comparator into a rectangular wave and a clock generator, counts the rectangular waves output by the waveform shaping circuit, and outputs the clock generator. And a decision value setter for setting a decision value for reducing the proportional gain of the voltage controller of the count value of the up / down counter and for extending the integration time of the current controller. And comparing the judgment value set by the judgment value setter with the count value of the up / down counter, and when the count value reaches the judgment value, the proportional gain is reduced by a predetermined value and the integration is performed. A fourth comparator that outputs a signal for extending the time by a predetermined value, and a rectangular wave output by the fourth comparator when the fourth comparator outputs the signal and by the waveform shaping circuit is input for a predetermined time. The converter device according to claim 1, further comprising a reset circuit that causes the up-down counter to start counting down the clock when not being performed. 6. A converter unit for supplying DC power converted from AC power, a DC voltage detection circuit for detecting a DC voltage output by the converter unit, a reference circuit for outputting a reference value of the DC voltage, A voltage controller that amplifies and outputs the deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit, a current detector that detects the input current to the converter unit, and the current detector When the voltage detected by the direct current voltage detection circuit and the current controller that amplifies the deviation between the detected current value and the output value of the voltage controller and gives the current control signal to the converter section, determines the vibration. The vibration determination voltage setter that sets the voltage for doing, compares the voltage detected by the DC voltage detection circuit and the voltage set by the vibration determination voltage setter, When the detected voltage exceeds the set voltage, a deviation amplifier that amplifies the deviation of both voltages and outputs it as a rectangular wave voltage, and a proportional gain of the voltage controller based on the rectangular wave voltage output by the deviation amplifier It is determined whether or not the integration time of the current controller should be extended, and when it is determined that the integration time of the current controller should be reduced and further extended, the proportional gain is reduced by a predetermined value and the current controller of the current controller is reduced. A converter device, comprising: a gain determination unit that outputs a signal that extends the integration time by a predetermined value. 7. The gain determination unit reduces the proportional gain of the voltage controller of the integrator for integrating the rectangular wave voltage output by the deviation amplifier and the voltage output by the integrator, and further, the integration time of the current controller. Is compared with the level set by the level setter and the voltage output by the integrator, and when the voltage reaches the level, the proportional gain is set to a predetermined value. 7. The converter device according to claim 6, further comprising a fifth comparator that outputs a signal that reduces the value and extends the integration time of the current controller by a predetermined value, and that resets the integrator. 8. The gain determination unit reduces the proportional gain of the counter for counting the rectangular wave voltage output from the deviation amplifier and the count value of the counter, and further extends the integration time of the current controller. A judgment value setter for setting a power judgment value, the judgment value set by the judgment value setter and the count value of the counter are compared, and when the count value reaches the judgment value, the proportional gain is set. A sixth comparator for outputting a signal for reducing the integration time of the current controller by a predetermined value while reducing the integration time by a predetermined value;
7. The converter device according to claim 6, further comprising: a reset circuit that resets the counter when the comparator outputs the signal and when the rectangular wave voltage output by the deviation amplifier is not input for a predetermined time. 9. The up / down counter for counting the rectangular wave voltage output from the deviation amplifier and having a clock generator, and the up / down counter for counting down the clock generated by the clock generator, and the up / down counter. Reduce the proportional gain of the voltage controller of the count value of the counter,
Moreover, the judgment value setter that sets the judgment value for extending the integration time of the current controller is compared with the judgment value set by the judgment value setter and the count value of the up / down counter, and the count value is When a judgment value is reached, a seventh comparator that outputs a signal that reduces the proportional gain by a predetermined value and extends the integration time of the current controller by a predetermined value, and the seventh comparator outputs the signal. 7. The converter device according to claim 6, further comprising: a reset circuit that causes the up-down counter to start counting down the clock when the rectangular wave voltage output from the deviation amplifier is not input for a predetermined time. 10. A converter unit for supplying DC power converted from AC power, a DC voltage detection circuit for detecting a DC voltage output by the converter unit, a reference circuit for outputting a reference value of the DC voltage, A voltage controller that amplifies and outputs the deviation between the reference value output by the reference circuit and the DC voltage value detected by the DC voltage detection circuit, a current detector that detects the input current to the converter unit, and the current detector When the voltage detected by the direct current voltage detection circuit and the current controller that amplifies the deviation between the detected current value and the output value of the voltage controller and gives the current control signal to the converter section, determines the vibration. The vibration judgment voltage setter that sets the voltage for the operation is compared with the voltage detected by the DC voltage detection circuit and the voltage set by the vibration judgment voltage setter. An eighth comparator that outputs an ON signal when the detected voltage exceeds the set voltage, a relay that is turned ON by an ON signal output from the eighth comparator, and the relay is ON And whether to reduce the proportional gain of the voltage controller based on the voltage signal generated by the signal generator and the voltage signal generated by the signal generator, and to extend the integration time of the current controller. If it is determined that the proportional gain should be reduced and further extended, the gain determining unit that outputs a signal that reduces the proportional gain by a predetermined value and extends the integration time of the current controller by a predetermined value. A converter device comprising: 11. The gain determination unit reduces the proportional gain of the voltage controller of the integrator that integrates the voltage signal output by the signal generator and the voltage output by the integrator, and further, the integration time of the current controller. Is compared with the level set by the level setter and the voltage output by the integrator, and when the voltage reaches the level, the proportional gain is set to a predetermined value. 11. The converter device according to claim 10, further comprising a ninth comparator that outputs a signal that reduces the value and extends the integration time of the current controller by a predetermined value, and that resets the integrator. 12. The gain determination unit reduces the proportional gain of the voltage controller of the counter that counts the voltage signal output from the signal generator and the count value of the counter, and further extends the integration time of the current controller. A judgment value setter for setting a power judgment value, the judgment value set by the judgment value setter and the count value of the counter are compared, and when the count value reaches the judgment value, the proportional gain is set. 11. The converter device according to claim 10, further comprising: a tenth comparator that outputs a signal that reduces a predetermined value and extends the integration time of the current controller by a predetermined value, and further that resets the counter. 13. The gain determination section counts the voltage signal output from the signal generator, and further has a clock generator,
An up-down counter that counts down the clock generated by the clock generator, and a determination value that reduces the proportional gain of the voltage controller of the count value of the up-down counter and further extends the integration time of the current controller are set. A judgment value setter compares the judgment value set by the judgment value setter with the count value of the up / down counter, and when the count value reaches the judgment value, the proportional gain is reduced by a predetermined value. And an eleventh comparator that outputs a signal that extends the integration time of the current controller by a predetermined value, and when the eleventh comparator outputs the signal and when the voltage signal output by the signal generator is not input for the predetermined time. 11. A reset circuit, which sometimes causes the up-down counter to start counting down the clock. Of the converter device.