JPH1198679A - Converter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a converter device which can be stopped for the overvoltage protection and, furthermore, can be stopped by the detection of a voltage hunting which is lower than an overvoltage, irrespective of the frequency of the hunting. SOLUTION: A converter device has a DC voltage detection circuit 8, which detects a DC voltage outputted by a converter unit 9, a 1st comparator 20 which compares the detected voltage with an overvoltage set by an instantaneous overvoltage setting device 21. When the detected voltage reaches a set overvoltage, the device stops the converter unit 9 instantaneously, a 2nd comparator 20 which compares the detected voltage with a voltage set by an oscillation discriminating voltage setting device 19 and outputs a voltage, corresponding to the excessive value of the detected voltage over the set voltage and stop discriminating units (23-25), which when it has discriminated that the converter unit 9 is to be stopped based on the outputted voltages, outputs a signal by which the converter unit 9 is stopped.

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 for converting DC power from AC power and supplying the load to a load having a capacitor.

[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
Three-phase AC power is supplied from the commercial AC power supply 1 to a main circuit bridge 9 made of a semiconductor, and the main circuit bridge 9 rectifies the supplied three-phase AC power into DC power and outputs the DC power. The DC power output from the main circuit bridge 9 is provided to inverters 3, 4, and 5 each having a smoothing capacitor 18. Of the three-phase input lines of the main circuit bridge 9, two-phase input lines have a CT 6 (Current Transf.) For detecting an alternating current.
ormer) is attached, and the outputs of these two CTs 6 are supplied to a current detector 7 to detect an input current to the main circuit bridge 9.

A DC voltage detection circuit 8 is connected between output lines of the main circuit bridge 9 and detects a DC voltage output from the converter device 2. The main circuit bridge 9, the CT 6, and the DC voltage detection circuit 8 constitute a converter main circuit 10. The DC voltage value detected by the DC voltage detection circuit 8 is supplied to a voltage controller 12 and an overvoltage detection circuit 13, and the voltage controller 12 supplies the DC voltage value and a reference value of the DC voltage output from the converter device 2. A deviation from the reference DC voltage value from the reference circuit 11 is amplified and output. The overvoltage detection circuit 13 supplies 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 supplied to a current controller 14 and an overcurrent detection circuit 15, and the current controller 14 amplifies a deviation between the current value and the output of the voltage controller 12, and The control signal is given to the main circuit bridge 9. The overcurrent detection circuit 15 outputs a stop signal to the interlock circuit 16 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 a stop signal is given from the overvoltage detection circuit 13 or the overcurrent detection circuit 15.

[0005] The operation of the converter device 2 having such a configuration will be described below. The converter device 2 supplies DC power to the voltage-type inverters 3 to 5 including the capacitor load 18, and controls the DC voltage to be constant with respect to the load fluctuation. That is, the output voltage is
Is controlled by the voltage controller 12 so that the reference DC voltage value is output.

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 to generate a current instruction signal, when the load of the inverter 3 increases rapidly, the detection value of the DC voltage detection circuit 8 increases. And the reference DC voltage value increases, and the reference current value output to the current controller 14 increases. Therefore, the current instruction value given by the current controller 14 to the main circuit bridge 9 increases,
The main circuit bridge 9 operates to supply a large amount of current to the capacitor 18 so as to reduce the fluctuation of the DC voltage detected by the DC voltage detection circuit 8.

[0007] 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 stabilized. 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 supplied from the overvoltage detection circuit 13 to the interlock circuit 16, and the interlock circuit 16 stops the main circuit bridge 9 and stops the converter main circuit 10 to protect the components.

However, when 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, the temperature of the capacitor 18 as a load may be increased due to the ripple current and may be damaged. The overcurrent detection circuit 15 supplies a stop signal to the interlock circuit 16 when the current value from the current detector 7 reaches a preset current value, and the interlock circuit 16 The circuit bridge 9 is stopped and the converter main circuit 10 is stopped to protect the components.

[0009]

As described above, in the conventional converter device 2, when an overvoltage equal to or higher than the overvoltage set value occurs even once, the interlock circuit 16 is activated and stopped. In the case where the voltage fluctuation occurs due to the normal load fluctuation of FIG. 5, if the overvoltage set value is set low, the operation stops. On the contrary, if the overvoltage set value is set high, the interlock circuit 16 is stopped.
There is a problem that the hunting in a voltage range in which the capacitor does not operate may cause the damage of the capacitor 18. The present invention
It is made in view of the circumstances as described above, and it is possible to stop protection from overvoltage, and even if voltage hunting that does not reach these overvoltages occurs, it can detect and stop regardless of the frequency. It is an object to provide a converter device.

[0010]

According to a first aspect of the present invention, there is provided a converter device for supplying a load having a capacitor with a DC power converted from an AC power, and a DC for detecting a DC voltage output from the converter. A voltage detection circuit, a voltage detected by the DC voltage detection circuit, an instantaneous overvoltage setting device that sets an overvoltage to be instantaneously stopped by the converter section, and a voltage detected by the DC voltage detection circuit and the instantaneous overvoltage setting device. A first comparator for comparing a set overvoltage and outputting a signal for instantaneously stopping the converter unit when the voltage reaches the overvoltage; and receiving the signal output by the first comparator, And an interlock circuit for stopping the section.

[0011] A converter device according to a second aspect of the present invention is a vibration determining voltage setting device for setting a voltage for determining the vibration when the voltage detected by the DC voltage detecting circuit vibrates;
A second comparator that compares the voltage detected by the DC voltage detection circuit with the voltage set by the vibration determination voltage setting device, and outputs a voltage corresponding to the amount of the detected voltage exceeding the set voltage. A stop determining unit that determines whether to stop the converter unit based on the voltage output from the second comparator, and outputs a signal to stop the converter unit when it is determined that the converter unit should stop, The circuit receives the signal output by the stop determination unit and stops the converter unit.

In the converter device according to a third aspect of the present invention, the stop judging section sets the integrator for integrating the voltage output from the second comparator and the level of the voltage output from the integrator at which the converter section should be stopped. A stop level setting device that performs the operation, compares the level set by the stop level setting device with the voltage output by the integrator, and when the voltage reaches the level,
A third comparator for outputting a signal for stopping the converter section.

[0013] In the converter device according to a fourth aspect of the present invention, the stop judging section includes a waveform shaping circuit for shaping the voltage output from the second comparator into a rectangular wave, and a counter for counting the square wave output from the waveform shaping circuit. A stop determination value setting device for setting a determination value of the count value of the counter for stopping the converter section, and comparing the determination value set by the stop determination value setting device with the count value of the counter. A fourth comparator that outputs a signal for stopping the converter when the numerical value reaches the determination value.

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

In the converter device according to a sixth aspect of the present invention, the stop judging section has a waveform shaping circuit for shaping the voltage output by the second comparator into a rectangular wave, and a clock generator. An up / down counter that counts a rectangular wave and counts down a clock generated by a clock generator; a stop determination value setting device that sets a determination value of the count value of the up / down counter to stop the converter unit; A fifth comparator for comparing a judgment value set by a stop judgment value setting device with a count value of the up / down counter and outputting a signal for stopping the converter section when the count value reaches the judgment value; And a reset circuit for causing the up / down counter to start counting down the clock when the rectangular wave output from the waveform shaping circuit is not input for a predetermined time. Characterized in that it comprises a.

According to a seventh aspect of the present invention, there is provided a converter unit for supplying a load having a capacitor with DC power converted from AC power, a DC voltage detection circuit for detecting a DC voltage output from the converter unit, An instantaneous overvoltage setting device that sets an overvoltage at which the converter section should instantaneously stop the voltage detected by the DC voltage detection circuit, and compares the voltage detected by the DC voltage detection circuit with the overvoltage set by the instantaneous overvoltage setting device. And when the voltage reaches the overvoltage, amplify the deviation between the voltage and the overvoltage,
A first deviation amplifier that outputs the signal as a signal for instantaneously stopping the converter unit; and an interlock circuit that receives the signal output by the first deviation amplifier and stops the converter unit.

According to an eighth aspect of the present invention, there is provided a converter device for setting a voltage for determining a vibration when a voltage detected by a DC voltage detecting circuit vibrates;
Compare the voltage detected by the DC voltage detection circuit with the voltage set by the vibration determination voltage setting device, and when the detected voltage exceeds the set voltage, amplify the difference between the two voltages to obtain a square wave voltage. A second deviation amplifier that outputs
A stop determination unit that determines whether to stop the converter unit based on the rectangular wave voltage output by the deviation amplifier, and outputs a signal to stop the converter unit when it is determined that the converter unit should be stopped; and an interlock circuit. Receiving the signal output by the stop determining unit, stopping the converter unit.

In a converter device according to a ninth aspect of the present invention, the stop judging section includes an integrator for integrating the rectangular wave voltage output from the second deviation amplifier, and a level of the voltage output from the integrator for stopping the converter section. A stop level setting device for setting the level, and comparing the level set by the stop level setting device with the voltage output by the integrator, and when the voltage reaches the level, outputs a signal for stopping the converter section. And a sixth comparator for outputting.

In the converter device according to a tenth aspect of the present invention, the stop judging section sets a counter for counting the rectangular wave voltage output from the second deviation amplifier and a judgment value of the count value of the counter for stopping the converter section. A stop determination value setting device that performs a comparison between a determination value set by the stop determination value setting device and a count value of the counter, and a signal that stops the converter unit when the count value reaches the determination value. And a reset circuit that resets the counter when the rectangular wave voltage output from the second deviation amplifier is not input for a predetermined period of time.

In the converter device according to an eleventh aspect of the present invention, the stop judging section counts the rectangular wave voltage output from the second deviation amplifier, has a clock generator, and outputs a clock generated by the clock generator. An up / down counter for counting down, a stop judgment value setting device for setting a judgment value for stopping the converter unit of the count value of the up / down counter, a judgment value set by the stop judgment value setting device, and the up / down counter An eighth comparator for outputting a signal for stopping the converter section when the counted value reaches the determination value, and a rectangular wave voltage output from the second deviation amplifier for a predetermined time. And a reset circuit for causing the up / down counter to start counting down the clock when not input.

According to a twelfth aspect of the present invention, in the converter device, when the voltage detected by the DC voltage detecting circuit vibrates, a vibration determining voltage setting device for setting a voltage for determining the vibration; A ninth comparator that compares the detected voltage with a voltage set by the vibration determination voltage setting device and outputs an ON signal when the detected voltage exceeds the set voltage, A relay that is turned on by the output ON signal, a signal generator that generates a predetermined voltage signal when the relay is on, and a converter unit that should be stopped based on the voltage signal generated by the signal generator And a stop determination unit that outputs a signal to stop the converter unit when it is determined that the stop unit should be stopped, and the interlock circuit outputs the signal output by the stop determination unit. Only in, characterized in that it stops the converter unit.

In the converter device according to a thirteenth aspect, the stop judging section sets an integrator for integrating the voltage signal output from the signal generator and a level at which the converter section should stop the voltage output by the integrator. A stop level setting device that performs the operation, compares the level set by the stop level setting device with the voltage output by the integrator, and outputs a signal that stops the converter section when the voltage reaches the level. First
A zero comparator.

According to a fourteenth aspect of the present invention, the stop judging section includes a counter for counting the voltage signal output by the signal generator, and a stop for setting a judgment value of the count of the counter to stop the converter section. Judgment value setting device, comparing the judgment value set by the stop judgment value setting device and the count value of the counter, when the count value reaches the judgment value,
An eleventh comparator for outputting a signal for stopping the converter section.

In the converter device according to a fifteenth aspect, the stop judging section counts the voltage signal output by the signal generator, has a clock generator, and counts down the clock generated by the clock generator. An up / down counter, a stop judgment value setting device for setting a judgment value of the count value of the up / down counter to stop the converter section, a judgment value set by the stop judgment value setting device, and a sum of the up / down counter A twelfth comparator that outputs a signal for stopping the converter when the count value reaches the determination value, and a voltage signal output by the signal generator is not input for a predetermined time. A reset circuit for causing the up / down counter to start counting down the clock.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. Embodiment 1 FIG. 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, which rectifies three-phase AC power supplied from the commercial AC power supply 1 to DC power and outputs the DC power. The DC power output from the main circuit bridge 9 is smoothed. It is provided to inverters 3, 4, and 5 each having a capacitor 18. 3 of main circuit bridge 9
Of the phase input lines, two-phase input lines are provided with CT6 (Current Transformer) for detecting an AC current, respectively, and the outputs of the two CT6 are supplied to a current detector 7 and a main circuit bridge 9 is provided. The input current to is detected.

The converter device 27 further includes a DC voltage detection circuit 8 connected between the output lines of the main circuit bridge 9 and detecting the DC voltage output from the converter device 27.
The main circuit bridge 9, the CT 6, and the DC voltage detection circuit 8
The converter main circuit 10 is constituted.

Converter device 27 is also provided with a DC voltage value detected by DC voltage detection circuit 8, and receives a reference DC voltage from reference circuit 11 that provides this DC voltage value and a reference value of the DC voltage output from converter device 27. A voltage controller 12 for amplifying and outputting a deviation from the voltage value and a current value detected by the current detector 7 are provided. A deviation between this current value and the output of the voltage controller 12 is amplified, and the amplified value is mainly used as a current control signal. Current controller 14 applied to circuit bridge 9
And an interlock circuit 25 for stopping the main circuit bridge 9 (converter main circuit 10), and a current value detected by the current detector 7, and when the current value reaches a preset current value. And an overcurrent detection circuit 15 that supplies a signal for stopping to the interlock circuit 25.

The converter device 27 also includes an instantaneous overvoltage setting device 21 for setting an overvoltage value of the DC voltage value detected by the DC voltage detection circuit 8 at which the main circuit bridge 9 serving as the converter section should be instantaneously stopped. The voltage value detected by the detection circuit 8 is compared with the overvoltage value set by the instantaneous overvoltage setting device 21, and when the detected voltage value reaches the overvoltage value,
A comparator 20 (first and second comparators) for outputting a signal for instantaneously stopping the main circuit bridge 9 to the interlock circuit 25 is provided.

The converter device 27 further includes a vibration (hunting) determination voltage setting unit 19 for setting a voltage value for determining the vibration when the voltage value detected by the DC voltage detection circuit 8 vibrates (hunting). And 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 outputs a voltage corresponding to the amount by which the detected voltage value exceeds the set voltage value. The converter device 27 also includes an integrator 22 that integrates the voltage output by the comparator 20, a stop level setter 23 that sets the level of the voltage output by the integrator 22 at which the main circuit bridge 9 should be stopped, The level set by the stop level setting unit 23 is compared with the voltage output by the integrator 22. When the voltage reaches the level, a signal for stopping the main circuit bridge 9 is output to the interlock circuit 2.
And a comparator 24 (third comparator) for outputting the output to the third comparator 5.

The operation of the converter device 27 having such a configuration will be described below. The converter device 27 supplies DC power to the voltage-type inverters 3 to 5 including the capacitor load 18, and controls the DC voltage to be kept constant with respect to the load fluctuation. That is, control is performed by the voltage controller 12 so that the output voltage becomes the reference DC voltage value output from 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 12 amplifies the deviation between the detection value of the DC voltage detection circuit 8 and the reference DC voltage value to generate a current instruction signal, when the load of the inverter 3 increases rapidly, the detection value of the DC voltage detection circuit 8 increases. And the reference DC voltage value increases, and the reference current value output to the current controller 14 increases. Therefore, the current instruction value given by the current controller 14 to the main circuit bridge 9 increases,
The main circuit bridge 9 operates to supply a large amount of current to the capacitor 18 so as to reduce the fluctuation of the DC voltage detected by the DC voltage detection circuit 8.

The overcurrent detection circuit 15 provides a stop signal 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 stops the converter main circuit 10 to protect the components.

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 stabilized. Here, when the capacitance of the capacitor 18 changes, especially 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, the DC voltage detection circuit 8
When the detected voltage value reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the comparator 20 outputs a signal for instantaneously stopping the main circuit bridge 9 to the interlock circuit 25, and outputs the signal to the interlock circuit 25. Is the main circuit bridge 9
(The converter main circuit 10) is stopped to protect the components including the load capacitor 18.

The voltage value detected by the DC voltage detection circuit 8 is
When the hunting is continued without reaching the overvoltage value set by the instantaneous overvoltage setting device 21, the comparator 20
The voltage value detected by the DC voltage detection circuit 8 is compared with the voltage value set by the hunting determination voltage setting device 19, and a voltage corresponding to the detected voltage value exceeding the set voltage value is output. The voltage output from the comparator 20 is integrated by the integrator 22 and output. The voltage integrated and output by the integrator 22 is compared by the comparator 24 with the level set by the stop level setting unit 23. When the voltage reaches the level, the comparator 24 outputs a signal for stopping the main circuit bridge 9. To the interlock circuit 25. Interlock circuit 25
Stops the main circuit bridge 9 (converter main circuit 10) to prevent the load capacitor 18 from being damaged due to the rise in temperature due to the ripple current.

The detection time of the hunting operation varies depending on the amount of the voltage exceeding the voltage value set by the hunting determination voltage setting device 19 and the frequency thereof. This is because the integrator 22 is activated when the integrated value exceeds the level set by the stop level setter 23,
If the ripple is large, the detection time is short, and if the ripple is small, the detection time is long. The detection time also varies depending on the level of the frequency of the hunting operation. However, the capacitor 18 can be protected by appropriately setting the set level of the stop level setting unit 23 in accordance with the characteristics of the capacitor 18.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 27 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

Embodiment 2 FIG. 2 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. 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, and the detected voltage value exceeds the set voltage value. The voltage output according to the minute,
A waveform shaping circuit 28 for shaping into a rectangular wave, and a waveform shaping circuit 2
8 is provided with a counter 29 for counting the rectangular waves output.

The converter device 34 also includes a counter 2
The stop judgment value setting unit 30 for setting a judgment value for stopping the main circuit bridge 9 of the count value of the counter 9 is compared with the judgment value set by the stop judgment value setting unit 30 and the count value of the counter 29. A comparator 31 (fourth comparator) that outputs a signal for stopping the main circuit bridge 9 to the interlock circuit 25 when the numerical value reaches the determination value. Other configurations are the same as the configuration of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

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 a portion where the detected voltage value exceeds the set voltage value is output. The waveform shaping circuit 28 shapes this voltage output from the comparator 20 into a rectangular wave and outputs it. Counter 29
Counts the rectangular waves output by the waveform shaping circuit 28.

The comparator 31 compares the count value of the counter 29 with the judgment value set by the stop judgment value setting unit 30, and outputs a signal for stopping the main circuit bridge 9 when the count value reaches the judgment value. Output to the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current.
Other operations are the same as the operations of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 34 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components. Also,
Since the waveform of the output voltage of the comparator 20 is shaped into a rectangular wave by the waveform shaping circuit 28 and counted by the counter 29, if the hunting frequency is the same, the detection time of the hunting operation is detected by the DC voltage detection circuit 8. Irrespective of the applied voltage value.

Embodiment 3 FIG. 3 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. 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, and the detected voltage value exceeds the set voltage value. The voltage output according to the minute,
A waveform shaping circuit 35 for shaping into a rectangular wave, and a waveform shaping circuit 3
5 includes a counter 37 for counting the rectangular waves output by the counter 5 and a reset circuit 36 for resetting the counter 37 when the rectangular waves output by the waveform shaping circuit 35 are not input for a predetermined time.

The converter device 42 also includes a counter 3
7, a stop judgment value setting device 38 for setting a judgment value for stopping the main circuit bridge 9 and a judgment value set by the stop judgment value setting device 38 and a count value of the counter 37 are compared. A comparator 39 for outputting a signal for stopping the main circuit bridge 9 to the interlock circuit 25 when the numerical value reaches the determination value. Other configurations are the same as the configuration of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

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 a portion where the detected voltage value exceeds 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. Counter 37
Counts the rectangular waves output by 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 stop judgment value setting unit 38, and outputs a signal for stopping the main circuit bridge 9 when the count value reaches the judgment value. Output to the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current.
Other operations are the same as the operations of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 42 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

Since the waveform of the output voltage of the comparator 20 is shaped into a rectangular wave by the waveform shaping circuit 35 and counted by the counter 37, if the hunting frequency is the same,
The detection time of the hunting operation is substantially the same irrespective of the voltage value detected by the DC voltage detection circuit 8, and when the hunting does not continue for a certain period of time, the counter 37 is reset. Even if hunting occurs temporarily due to the behavior, it can be distinguished from hunting due to a change in the capacitance of the capacitor 18.

Embodiment 4 FIG. 4 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. 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, and the detected voltage value exceeds the set voltage value. The voltage output according to the minute,
An up / down counter having a waveform shaping circuit 35 for shaping into a rectangular wave, and a clock generator (not shown) for counting the square waves output from the waveform shaping circuit 35 and counting down the clock generated by the clock generator. 43, and a reset circuit 36 that causes the up / down counter 43 to start counting down the clock when the rectangular wave output from the waveform shaping circuit 35 is not input for a predetermined time.

The converter device 48 also includes a stop judgment value setting device 44 for setting a judgment value of the count value of the up / down counter 43 to stop the main circuit bridge 9, and a judgment value set by the stop judgment value setting device 44. The comparator 45 compares the value with the count value of the up / down counter 43 and outputs a signal for stopping the main circuit bridge 9 to the interlock circuit 25 when the count value reaches the determination value (fifth comparator).
And Other configurations are the same as the configuration of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

The operation of 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 a portion where the detected voltage value exceeds 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, and the up / down counter 43 counts the rectangular waves output from the waveform shaping circuit 35.

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

The comparator 45 has an up / down counter 43
Is compared with the judgment value set by the stop judgment value setting unit 44, and when the count value reaches the judgment value, a signal for stopping the main circuit bridge 9 is output to the interlock circuit 25. The interlock circuit 25 includes the main circuit bridge 9
(The converter main circuit 10) is stopped to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current. Other operations are the same as those of converter device 27 described in the first embodiment.
Description is omitted.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 48 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

Since the waveform of the output voltage of the comparator 20 is shaped into a rectangular wave by the waveform shaping circuit 35 and counted by the up / down counter 43, if the hunting frequency is the same, the detection time of the hunting operation becomes They are substantially the same regardless of the voltage value detected by the DC voltage detection circuit 8. If hunting does not continue for a certain period of time, the up / down counter 43 starts counting down the clock. Therefore, even if hunting occurs temporarily due to the behavior of the load of the inverters 3 to 5, hunting due to a change in the capacitance of the capacitor 18 will occur. If a rectangular wave is input before the countdown is completed, the countdown is stopped and counting is started from the count value at that time, so that the load behavior of the inverters 3 to 5 is changed. Thus, even if hunting repeatedly occurs in a short time, it can be distinguished from hunting due to a change in the capacitance of the capacitor 18.

Embodiment 5 FIG. 5 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention. The converter device 55 includes an instantaneous overvoltage setting device 21 for setting an overvoltage value at which the main circuit bridge 9 should instantaneously stop the DC voltage value detected by the DC voltage detection circuit 8, and a voltage value detected by the DC voltage detection circuit 8. And instantaneous overvoltage setting device 2
1 is compared with the set overvoltage value, and when the voltage value reaches the overvoltage value, the difference between the voltage value and the overvoltage value is amplified, and the difference is output as a signal for instantaneously stopping the main circuit bridge 9. An amplifier 49 (first and second deviation amplifiers) and an interlock circuit 25 that receives a signal output from the deviation amplifier 49 and stops the main circuit bridge 9 are provided.

The converter device 55 further includes a hunting judgment voltage setting unit 19 for setting a voltage value for judging hunting when the voltage detected by the DC voltage detection circuit 8 hunts. Comparing 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 amplifies the deviation between the two voltage values when the detected voltage value exceeds the set voltage value. And outputs it as a rectangular wave voltage.

The converter device 55 also includes an integrator 50 for integrating the rectangular wave voltage output from the deviation amplifier 49 and a stop level for setting the level of the voltage output from the integrator 50 at which the main circuit bridge 9 should be stopped. The setting unit 52 compares the level set by the stop level setting unit 52 with the voltage output by the integrator 50, and outputs a signal for stopping the main circuit bridge 9 when the voltage reaches the level. Device 51 (sixth comparator). Other configurations are the same as those of converter device 2 described in the first embodiment.
7, the description is 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 reaches the overvoltage value set by the instantaneous overvoltage setting unit 21, the deviation amplifier 49 amplifies the deviation between the voltage value and the overvoltage value, and amplifies the difference between the voltage value and the overvoltage value. 9 is output to the interlock circuit 25 as a signal for instantaneously stopping the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to protect the components including the load capacitor 18.

The voltage value detected by the DC voltage detection circuit 8 is
If the hunting is continued without reaching the overvoltage value set by the instantaneous overvoltage setting device 21, 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 setting device 19, and 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 square wave voltage output from the deviation amplifier 49 is
It is integrated by the integrator 50 and output. The voltage integrated and output by the integrator 50 is compared by the comparator 51 with the level set by the stop level setter 52, and when the voltage reaches the level, the comparator 51 outputs a signal for stopping the main circuit bridge 9. To the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current.
Other operations are the same as the operations of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 55 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

Embodiment 6 FIG. 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 stop judgment value setting unit 59 for setting the judgment value of the count value of 8 to stop the main circuit bridge 9, the judgment value set by the stop judgment value setting unit 59 and the count value of the counter 58 are compared. A comparator 60 (seventh comparator) that outputs a signal to stop the main circuit bridge 9 when the numerical value reaches the determination value, and a counter that outputs the rectangular wave voltage output from the deviation amplifier 56 for a predetermined time. And a reset circuit 57 for resetting 58. Other configurations are the same as those of converter device 55 described in the fifth embodiment, and a description thereof will not be repeated.

Hereinafter, the operation of the converter device 63 having such a configuration will be described. The converter device 63 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 when the deviation amplifier 56 determines that the detected voltage value exceeds the set voltage value. Is
The difference 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
When the rectangular wave output from 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 stop judgment value setting unit 59, and outputs a signal for stopping the main circuit bridge 9 when the count value reaches the judgment value. Output to the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current.
Other operations are the same as those of converter device 55 described in the fifth embodiment, and a description thereof will not be repeated.

As a result, when the voltage value detected by DC voltage detection circuit 8 reaches the overvoltage value set by instantaneous overvoltage setting device 21, converter device 63 changes to the overvoltage value set by instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

Since the deviation amplifier 56 shapes the output voltage into a rectangular wave and counts it by the counter 58, if the hunting frequency is the same, the detection time of the hunting operation is determined by the voltage detected by the DC voltage detection circuit 8. When the hunting does not continue for a certain period of time while the values are substantially the same regardless of the value, the counter 58 is reset. Therefore, even if hunting occurs temporarily due to the behavior of the load of the inverters 3 to 5, the capacitance of the capacitor 18 is reduced. It can be distinguished from hunting due to fluctuation.

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

The converter device 70 also includes a stop judgment value setting device 66 for setting a judgment value of the count value of the up / down counter 65 to stop the main circuit bridge 9, and a judgment value set by the stop judgment value setting device 66. The value is compared with the count value of the up / down counter 65, and when the count value reaches the determination value, a comparator 67 (eighth comparator) that outputs a signal for stopping the main circuit bridge 9; And a reset circuit 64 for causing the up / down counter 65 to start counting down the clock when the rectangular wave voltage output by the counter is not input for a predetermined time. Other configurations are similar to those of converter device 55 described in the fifth embodiment.
Since the configuration is the same as that described above, the description is omitted.

Hereinafter, the operation of the converter device 70 having such a configuration will be described. The converter device 70 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 when the deviation amplifier 56 determines that the detected voltage value exceeds the set voltage value. Is
The difference between the two voltage values is amplified and output as a rectangular wave.
The up / down counter 65 counts the rectangular waves output by the deviation amplifier 56.

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

The comparator 67 has an up / down counter 65
Is compared with the judgment value set by the stop judgment value setting unit 66, and when the count value reaches the judgment value, a signal for stopping the main circuit bridge 9 is output to the interlock circuit 25. The interlock circuit 25 includes the main circuit bridge 9
(The converter main circuit 10) is stopped to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current. Other operations are the same as those of converter device 55 described in the fifth embodiment.
Description is omitted.

As a result, when the voltage value detected by the DC voltage detecting circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 70 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

Since the deviation amplifier 56 shapes the output voltage into a rectangular wave and counts it by the up / down counter 65, if the hunting frequency is the same, the detection time of the hunting operation is detected by the DC voltage detection circuit 8. Irrespective of the applied voltage value. If hunting does not continue for a certain period of time, the up / down counter 65 starts counting down the clock.
Even if hunting occurs temporarily due to the behavior of the load 5, the hunting can be distinguished from hunting due to a change in the capacitance of the capacitor 18, and if a rectangular wave is input before the countdown ends, the countdown is stopped. Since counting is started from the count value at that time, even if hunting repeatedly occurs in a short time due to the behavior of the load of the inverters 3 to 5, it can be distinguished from hunting due to a change in the capacitance of the capacitor 18.

Embodiment 8 FIG. FIG. 8 is a block diagram showing the configuration of the embodiment of the converter device according to the present invention. The converter device 82 includes a hunting determination voltage setting device 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. And a comparator 71 (a ninth comparator) that outputs an ON signal when the detected voltage value exceeds the set voltage value by comparing the value with the voltage value set by the hunting determination voltage setting device 19. 73 which is turned on by the ON signal output from the heater 71
(Relay contact 74) and a signal generator 72 for generating a predetermined voltage signal when the relay 73 is on.

The converter device 82 compares the voltage value detected by the DC voltage detection circuit 8 with the overvoltage value set by the instantaneous overvoltage setting device 21. When the voltage value reaches the overvoltage value, the main circuit bridge A comparator 75 (first comparator) that outputs a signal for instantaneously stopping the power supply 9, and an interlock circuit 25 that receives the signal output from the comparator 75 and stops the main circuit bridge 9.

The converter device 82 also includes an integrator 77 for integrating the voltage signal output from the signal generator 72 and a stop level for setting the level of the voltage output from the integrator 77 at which the main circuit bridge 9 should be stopped. The setter 78 compares the level set by the stop level setter 78 with the voltage output by the integrator 77, and when the voltage reaches the level, outputs a signal for stopping the main circuit bridge 9 to an interlock circuit. And a comparator 79 (tenth comparator) that outputs the signal to the comparator 25. Comparator 71, signal generator 72, relay 7
3 (relay contact 74) and the comparator 75 are an insulation comparator 76
Is composed. Other configurations are the same as the configuration of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

The operation of converter device 82 having such a configuration will be described below. When the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the comparator 75 outputs a signal for instantaneously stopping the main circuit bridge 9 to the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to protect the components including the load capacitor 18.

The voltage value detected by the DC voltage detection circuit 8 is
When the hunting is continued without reaching the overvoltage value set by the instantaneous overvoltage setting device 21, the comparator 71
The voltage value detected by the DC voltage detection circuit 8 is compared with the voltage value set by the hunting determination voltage setting device 19, and when the detected voltage value exceeds the set voltage value, an ON signal is output. 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 signal generator 72 is integrated by integrator 77 and output. The voltage integrated and output by the integrator 77 is compared by the comparator 79 with the level set by the stop level setter 78. When the voltage reaches the level, the comparator 79 outputs a signal for stopping the main circuit bridge 9. To the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current. Other operations are the same as the operations of converter device 27 described in the first embodiment, and a description thereof will not be repeated.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 82 sets the voltage to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

The comparator 71, the relay 73, and the signal generator 72 can insulate the protection circuit after the integrator 77 from the DC voltage detection circuit 8, and the relay 73 converts the output voltage of the signal generator 72 into a rectangular wave. Since the shaping and integration by the integrator 77 are performed, if the hunting frequency is the same, the detection time of the hunting operation is substantially the same regardless of the voltage value detected by the DC voltage detection circuit 8.

Embodiment 9 FIG. FIG. 9 is a block diagram showing a configuration of a converter device according to an embodiment of the present invention. The converter device 87 includes a counter 82 for counting the voltage signal output from the signal generator 72, and a counter 82
The stop judgment value setting unit 83 for setting a judgment value for stopping the main circuit bridge 9 of the count value of the above, and the judgment value set by the stop judgment value setting unit 83 and the count value of the counter 82 are compared. Reaches the judgment value, the main circuit bridge 9
And a comparator 84 (eleventh comparator) for outputting a signal for stopping the operation. Other configurations are the same as the configuration of converter device 82 described in the eighth embodiment, and a description thereof will not be repeated.

The operation of converter device 87 having such a configuration will be described below. When the voltage value detected by the DC voltage detection circuit 8 does not reach the overvoltage value set by the instantaneous overvoltage setting device 21 and hunting is continued, the comparator 71 sets the voltage detected by the DC voltage detection circuit 8 The value is compared with the voltage value set by the hunting determination voltage setting device 19,
When the detected voltage value exceeds the set voltage value, an ON signal is output. The relay 73 is turned on by the ON signal output from the comparator 71, and the signal generator 72 is turned on by the relay 73.
Outputs a predetermined voltage signal when 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 stop judgment value setting unit 83, and outputs a signal for stopping the main circuit bridge 9 when the count value reaches the judgment value. Output to the interlock circuit 25. The interlock circuit 25 stops the main circuit bridge 9 (converter main circuit 10) to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current.
Other operations are the same as those of converter device 82 described in the eighth embodiment, and a description thereof will not be repeated.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 87 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

The comparator 71, the relay 73, and the signal generator 72 can insulate the protection circuit after the counter 82 from the DC voltage detection circuit 8, and the relay 73 shapes the output voltage of the signal generator 72 into a rectangular wave. Then, since counting is performed by the counter 82, if the hunting frequency is the same,
The detection time of the hunting operation is substantially the same regardless of the voltage value detected by the DC voltage detection circuit 8.

Embodiment 10 FIG. 10 is a block diagram showing a configuration of an embodiment of a converter device according to the present invention. This converter device 94 has an up / down counter 88. The up / down counter 88 counts the voltage signal output by 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 further includes a stop judgment value setting device 90 for setting a judgment value of the count value of the up / down counter 88 to stop the main circuit bridge 9, and a judgment value set by the stop judgment value setting device 90. A comparator 91 (a twelfth comparator) that compares the value with the count value of the up / down counter 88 and outputs a signal for stopping the main circuit bridge 9 when the count value reaches the determination value; A reset circuit 89 is provided for causing the up / down counter 88 to start counting down the clock when the voltage signal output by the 72 has not been input for a predetermined time. Other configurations are the same as those of converter device 82 described in Embodiment 8.
Since the configuration is the same as that described above, the description is 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 does not reach the overvoltage value set by the instantaneous overvoltage setting device 21 and hunting is continued, the comparator 71 sets the voltage detected by the DC voltage detection circuit 8 The value is compared with the voltage value set by the hunting determination voltage setting device 19,
When the detected voltage value exceeds the set voltage value, an ON signal is output. The relay 73 is turned on by the ON signal output from the comparator 71, and the signal generator 72 is turned on by the relay 73.
Outputs a predetermined voltage signal when is turned on. The up / down counter 88 counts a voltage signal that is a rectangular wave output from the signal generator 72.

On the other hand, the reset circuit 89
When the rectangular wave output from 2 is not inputted for a predetermined time, the up / down counter 88 starts counting down the clock. The up / down counter 88 terminates the countdown when counting down to 0, and stops counting down when a rectangular wave is input from the signal generator 72 while counting down, and stops counting at that time. Starts counting from.

The comparator 91 has an up / down counter 88
Is compared with the judgment value set by the stop judgment value setting unit 90, and when the count value reaches the judgment value, a signal for stopping the main circuit bridge 9 is output to the interlock circuit 25. The interlock circuit 25 includes the main circuit bridge 9
(The converter main circuit 10) is stopped to prevent the load capacitor 18 from being damaged due to a rise in temperature due to the ripple current. Other operations are the same as those of converter device 82 described in the eighth embodiment.
Description is omitted.

As a result, when the voltage value detected by the DC voltage detection circuit 8 reaches the overvoltage value set by the instantaneous overvoltage setting device 21, the converter device 94 changes to the overvoltage value set by the instantaneous overvoltage setting device 21. In any case where the hunting continues without reaching, the converter main circuit 10 can be stopped to protect the components.

The converter device 94 is provided with the comparator 7
1, the protection circuit after the up / down counter 88 and the DC voltage detection circuit 8 can be insulated by the relay 73 and the signal generator 72, and the output voltage of the signal generator 72 is shaped into a rectangular wave by the relay 73, and the up / down counter Since counting is performed by 88, if the hunting frequency is the same, the detection time of the hunting operation is substantially the same regardless of the voltage value detected by the DC voltage detection circuit 8.

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

[0095]

According to the converter device of the first invention, the converter supplies the load having the capacitor with the DC power converted from the AC power, and the DC voltage detection circuit outputs the DC voltage output from the converter. Is detected. The instantaneous overvoltage setting device sets an overvoltage of the voltage detected by the DC voltage detection circuit, which should be instantaneously stopped by the converter unit.
The first comparator compares the voltage detected by the DC voltage detection circuit with the overvoltage set by the instantaneous overvoltage setting device, and instantaneously stops the converter unit when the voltage detected by the DC voltage detection circuit reaches the overvoltage. A signal is output, and the interlock circuit receives the signal and stops the converter unit. Thus, when the output voltage reaches the overvoltage value, the operation is stopped to protect the component devices.

According to the converter device of the second invention,
When the voltage detected by the DC voltage detection circuit vibrates, the vibration determination voltage setting device sets a voltage for determining the vibration. The second comparator compares the set voltage with the voltage detected by the DC voltage detection circuit, and outputs a voltage corresponding to the amount by which the detected voltage exceeds the set voltage. The stop determination unit determines whether to stop the converter unit based on the voltage, and outputs a signal to stop the converter unit when it is determined that the converter unit should be stopped. The interlock circuit receives the signal and stops the converter unit.
Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component devices.

According to the converter device of the third invention,
In the stop determination unit, the integrator integrates the voltage output by the second comparator, and the stop level setting unit sets the level of the voltage output by the integrator to stop the converter unit.
The third comparator compares the level with the voltage output by the integrator, and outputs a signal for stopping the converter when the voltage output by the integrator reaches the level. Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component devices.

According to the converter device of the fourth invention,
In the stop determination unit, the waveform shaping circuit shapes the voltage output by the second comparator into a rectangular wave, and the counter counts the rectangular wave. The stop determination value setting device sets a determination value of the count value at which the converter section is to be stopped, and the fourth comparator compares the determination value with the count value of the counter, and the count value becomes the determination value. When it reaches, it outputs a signal to stop the converter unit. Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component devices. If 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 fifth aspect,
The reset circuit resets the counter when the square wave output from the waveform shaping circuit is not input for a predetermined period of time. can do.

According to the converter device of the sixth aspect,
In the stop determination unit, the waveform shaping circuit shapes the voltage output by the second comparator into a rectangular wave, and the up / down counter counts the rectangular wave and counts down the clock generated by the clock generator. The stop determination value setting unit sets a determination value of the count value of the up / down counter at which the converter unit is to be stopped. The fifth comparator compares the determination value with the count value of the up / down counter, and determines the count value. Outputs a signal for stopping the converter unit when has reached the determination value. The reset circuit causes the up / down counter to start counting down the clock when the rectangular wave output from the waveform shaping circuit is not input for a predetermined time.

Thus, when the output voltage does not reach the overvoltage value and hunting continues, it is possible to stop and 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. In addition, even if hunting occurs temporarily due to the behavior of the inverter load, it can be distinguished from hunting due to fluctuations in the capacitance of the capacitor. Hunting due to the variation in the capacitance.

According to the converter device of the seventh aspect,
The converter unit supplies DC power converted from AC power to a load having a capacitor, and a DC voltage detection circuit
The DC voltage output from the converter unit is detected. The instantaneous overvoltage setting device sets an overvoltage of the detected DC voltage at which the converter section should instantaneously stop. The first deviation amplifier,
The voltage detected by the DC voltage detection circuit is compared with the overvoltage set by the instantaneous overvoltage setting device, and when the detected voltage reaches the overvoltage, the deviation between the detected voltage and the overvoltage is amplified, and the converter section is amplified. Is output as a signal for instantaneous stop. The interlock circuit receives the signal and stops the converter unit. Thus, when the output voltage reaches the overvoltage value, the operation is stopped to protect the component devices.

According to the converter device of the eighth aspect,
When the voltage detected by the DC voltage detection circuit vibrates, the vibration determination voltage setting device sets a voltage for determining the vibration, and the second deviation amplifier detects the set voltage and the DC voltage detection circuit detects the voltage. The detected voltage is compared with the detected voltage, and when the detected voltage exceeds the set voltage, the deviation between the two voltages is amplified and output as a rectangular wave voltage. The stop determination unit determines whether to stop the converter unit based on the rectangular wave voltage, and outputs a signal to stop the converter unit when determined to stop. The interlock circuit receives the signal and stops the converter unit. Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component devices.

According to the converter device of the ninth aspect,
In the stop determination unit, the integrator integrates the rectangular wave voltage output by the second deviation amplifier, and the stop level setting unit sets the level of the voltage output by the integrator at which the converter unit should be stopped. The sixth comparator compares the level with the voltage output by the integrator, and outputs a signal for stopping the converter unit when the voltage output by the integrator reaches the level. Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component devices.

According to the converter device of the tenth aspect, in the stop judging section, the counter counts the rectangular wave voltage output by the second deviation amplifier, and the stop judging value setting device sets the converter based on the count value of the counter. Set the judgment value to stop the unit. The seventh comparator compares the determination value with the count value of the counter, and outputs a signal for stopping the converter unit when the count value reaches the determination value. The reset circuit resets the counter when the rectangular wave voltage output from the second deviation amplifier has not been input for a predetermined time. Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component devices. In addition, 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 hunting occurs temporarily due to the behavior of the inverter load, the capacitance fluctuation of the capacitor Hunting.

According to the converter device of the eleventh aspect, in the stop judging section, the up / down counter counts the rectangular wave voltage output from the second deviation amplifier, and counts down the clock generated by the clock generator. I do. The stop judgment value setting device calculates the stop value of the up / down counter.
A determination value for stopping the converter unit is set, and the eighth comparator compares the determination value with the count value of the up / down counter, and stops the converter unit when the count value reaches the determination value. Output a signal. The reset circuit is
When the rectangular wave voltage output from the second deviation amplifier is not input for a predetermined time, the up / down counter starts counting down the clock.

Thus, when the output voltage does not reach the overvoltage value and hunting continues, it is possible to stop and 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. In addition, even if hunting occurs temporarily due to the behavior of the inverter load, it can be distinguished from hunting due to fluctuations in the capacitance of the capacitor. Hunting due to the variation in the capacitance.

According to the converter device of the twelfth aspect, when the voltage detected by the DC voltage detection circuit vibrates, the vibration determination voltage setting device sets a voltage for determining the vibration, and the ninth comparison The device compares the voltage detected by the DC voltage detection circuit with the voltage set by the vibration determination voltage setting device,
Outputs an ON signal when the detected voltage exceeds the set voltage. The relay is turned on by the ON signal,
The signal generator generates a predetermined voltage signal when the relay is on. The stop determination unit determines whether to stop the converter unit based on the voltage signal, and outputs a signal to stop the converter unit when determined to stop. The interlock circuit receives the signal and stops the converter unit.

Thus, when the output voltage does not reach the overvoltage value and hunting continues, it is possible to stop and 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 becomes substantially the same regardless of the voltage value.

According to the converter device of the thirteenth aspect, the stop judging section is characterized in that the integrator integrates the voltage signal output from the signal generator, and the stop level setter outputs the converter of the voltage output from the integrator. Set the level at which the part should be stopped. The tenth comparator compares the level with the voltage output by the integrator, and outputs a signal for stopping the converter unit when the voltage output by the integrator reaches the level. Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component 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 becomes substantially the same regardless of the voltage value.

According to the converter device of the fourteenth aspect, the stop judging unit counts the voltage signal output by the signal generator, and the stop judging value setting unit sets the converter unit based on the count value of the counter. Set the judgment value to be stopped. The eleventh comparator compares the determination value with the count value of the counter, and outputs a signal for stopping the converter unit when the count value reaches the determination value. Thereby, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and protect the component 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 becomes substantially the same regardless of the voltage value.

According to the converter device of the fifteenth aspect, in the stop judging section, the up / down counter counts the voltage signal output by the signal generator and counts down the clock generated by the clock generator. The stop judgment value setting device sets a judgment value of the count value of the up / down counter to stop the converter unit, and the twelfth comparator compares the judgment value with the count value of the up / down counter, and counts the count value. Outputs a signal for stopping the converter unit when reaches the determination value. The reset circuit causes the up / down counter to start counting down the clock when the voltage signal output from the signal generator is not input for a predetermined time.

Thus, when the output voltage does not reach the overvoltage value and the hunting continues, it is possible to stop and 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 becomes substantially the same regardless of the voltage value. In addition, even if hunting occurs temporarily due to the behavior of the inverter load, it can be distinguished from hunting due to fluctuations in the capacitance of the capacitor. Hunting due to the variation in the capacitance.

[Brief description of the 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 illustrating a configuration of an embodiment of a converter device according to the present invention.

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

FIG. 7 is a block diagram illustrating 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 illustrating a configuration example of a conventional converter device.

[Explanation of symbols]

1 Commercial AC power supply, 3-5 inverter, 6 CT, 7
Current detector, 8 DC voltage detection circuit, 10 converter main circuit, 11 reference circuit, 18 (smoothing) capacitor,
19 Hunting judgment voltage setting device (vibration judgment voltage setting device), 20, 24, 31, 45, 51, 60, 67, 7
1,75,79,84,91 comparator, 21 instantaneous overvoltage setter, 22,50,77 integrator, 23,52,7
8 Stop level setting device, 25 interlock circuit, 2
8, 35 waveform shaping circuit, 29, 37, 58, 82 counter, 30, 38, 44, 59, 66, 83, 90
Stop judgment value setting device, 36, 57, 64, 89 reset circuit, 43, 65, 88 up / down counter, 4
9,56 deviation amplifier, 72 signal generator, 73 relay, 74 relay contact, 76 insulation comparator.

Claims (15)

[Claims] 1. A converter for supplying a DC power converted from AC power to a load having a capacitor, a DC voltage detection circuit for detecting a DC voltage output from the converter, and a DC voltage detection circuit for detecting a DC voltage output from the converter. Voltage, an instantaneous overvoltage setting device for setting an overvoltage at which the converter section is to be momentarily stopped, and comparing the voltage detected by the DC voltage detection circuit with the overvoltage set by the instantaneous overvoltage setting device, wherein the voltage is the overvoltage. And a first comparator that outputs a signal for instantaneously stopping the converter unit when the power supply reaches the control unit, and an interlock circuit that receives the signal output by the first comparator and stops the converter unit. And a converter device. 2. A vibration judging voltage setting device for setting a voltage for judging a vibration when a voltage detected by a DC voltage detecting circuit vibrates, and a voltage detected by the DC voltage detecting circuit and the vibration judging. A second comparator for comparing a voltage set by the voltage setter and outputting a voltage corresponding to the detected voltage exceeding the set voltage; and a converter unit based on the voltage output by the second comparator. It is determined whether to stop, and when it is determined to stop, comprising a stop determination unit that outputs a signal to stop the converter unit,
The converter device according to claim 1, wherein the interlock circuit stops the converter unit in response to a signal output by the stop determination unit. A stop determining unit configured to integrate the voltage output by the second comparator, a stop level setting unit that sets a level of the voltage output by the integrator at which the converter unit should be stopped, A third comparator that compares a level set by the stop level setting unit with a voltage output by the integrator, and outputs a signal to stop the converter unit when the voltage reaches the level. The converter device according to claim 2. 4. A stop judging section, comprising: a waveform shaping circuit for shaping the voltage output by the second comparator into a rectangular wave; a counter for counting the square wave output by the waveform shaping circuit; A stop judgment value setting device for setting a judgment value for stopping the converter section, and comparing the judgment value set by the stop judgment value setting device with the count value of the counter, and the count value reaches the judgment value. The converter device according to claim 2, further comprising: a fourth comparator that outputs a signal for stopping the converter unit when the operation is performed. 5. The converter device according to claim 4, further comprising a reset circuit for resetting the counter when the rectangular wave output from the waveform shaping circuit is not input for a predetermined time. 6. The stop judging section has a waveform shaping circuit for shaping the voltage output from the second comparator into a rectangular wave, and a clock generator, counts the square wave output from the waveform shaping circuit, and generates a clock. An up / down counter for counting down the clock generated by the generator, a stop judgment value setting device for setting a judgment value for stopping the converter unit of the count value of the up / down counter, and the stop judgment value setting device Comparing the determined value with the count value of the up / down counter, and when the count value reaches the determined value, a fifth comparator that outputs a signal for stopping the converter unit; and the waveform shaping circuit includes: 3. The converter according to claim 2, further comprising: a reset circuit that causes the up / down counter to start counting down the clock when the output rectangular wave is not input for a predetermined time. Data device. 7. A converter for supplying a DC power converted from AC power to a load having a capacitor, a DC voltage detection circuit for detecting a DC voltage output from the converter, and a DC voltage detection circuit for detecting a DC voltage output from the converter. A voltage, an instantaneous overvoltage setting device for setting an overvoltage at which the converter section is to be momentarily stopped, and comparing the voltage detected by the DC voltage detection circuit with the overvoltage set by the instantaneous overvoltage setting device, wherein the voltage is the overvoltage. A first deviation amplifier that amplifies a deviation between the voltage and the overvoltage and outputs the signal as a signal for instantaneously stopping the converter unit, and a signal output by the first deviation amplifier, And an interlock circuit for stopping the section. 8. A vibration judging voltage setting device for setting a voltage for judging a vibration when a voltage detected by a DC voltage detecting circuit vibrates, a voltage detected by the DC voltage detecting circuit and the vibration judging. A second deviation amplifier for comparing a voltage set by a voltage setting device and amplifying a deviation between the two voltages when the detected voltage exceeds the set voltage and outputting the amplified voltage as a rectangular wave voltage; and a second deviation amplifier. It is determined whether to stop the converter unit based on the output square wave voltage, and when it is determined to stop, a stop determination unit that outputs a signal to stop the converter unit, the interlock circuit, Upon receiving the signal output by the stop determination unit,
The converter device according to claim 7, wherein the converter unit is stopped. 9. A stop judging unit, which integrates a rectangular wave voltage output by the second deviation amplifier, and a stop level setting unit that sets a level of the voltage output by the integrator at which the converter unit should be stopped. A sixth comparator that compares the level set by the stop level setting unit with the voltage output by the integrator, and outputs a signal to stop the converter unit when the voltage reaches the level. The converter device according to claim 8, further comprising: 10. A stop judging section, comprising: a counter for counting the rectangular wave voltage output by the second deviation amplifier; a stop judging value setting device for setting a judging value of the counter to stop the converter section. A seventh comparator for comparing a judgment value set by the stop judgment value setting device with a count value of the counter, and outputting a signal for stopping the converter section when the count value reaches the judgment value. 9. The converter device according to claim 8, further comprising: a reset circuit that resets the counter when the rectangular wave voltage output from the second deviation amplifier is not input for a predetermined time. An up / down counter that counts the rectangular wave voltage output by the second deviation amplifier, has a clock generator, and counts down a clock generated by the clock generator; A stop determination value setting device that sets a determination value of the count value of the up / down counter to stop the converter unit, and compares the determination value set by the stop determination value setting device with the count value of the up / down counter. An eighth comparator for outputting a signal for stopping the converter section when the count value reaches the determination value, and an up-converter when the rectangular wave voltage output from the second deviation amplifier is not input for a predetermined time. 9. The converter device according to claim 8, further comprising: a reset circuit for causing a down counter to start counting down the clock. 12. A vibration judging voltage setting device for setting a voltage for judging a vibration when a voltage detected by a DC voltage detecting circuit vibrates, a voltage detected by the DC voltage detecting circuit and the vibration judging. A ninth comparator that compares a voltage set by a voltage setter and outputs an ON signal when the detected voltage exceeds the set voltage, and is turned on by an ON signal output by the ninth comparator A relay, a signal generator for generating a predetermined voltage signal when the relay is on, and determining whether to stop the converter unit based on the voltage signal generated by the signal generator and stopping the converter unit A stop determination unit that outputs a signal for stopping the converter unit when it is determined that the power should be shut off, and the interlock circuit receives the signal output by the stop determination unit and stops the converter unit. The converter device according to claim 1, wherein 13. A stop judging unit, comprising: an integrator for integrating a voltage signal output by the signal generator; a stop level setting unit for setting a level of the voltage output by the integrator to stop the converter unit; And a tenth comparator that compares a level set by the stop level setting unit with a voltage output by the integrator, and outputs a signal to stop the converter unit when the voltage reaches the level. The converter device according to claim 12. 14. A stop judging section for counting a voltage signal output by the signal generator, a stop judging value setting device for setting a judging value of the count value of the counter to stop the converter section, A determination value set by a stop determination value setting device and a count value of the counter, and when the count value reaches the determination value, an eleventh comparator that outputs a signal to stop the converter unit. 13. The converter device according to claim 12, comprising a converter. 15. An up / down counter for counting a voltage signal output by a signal generator, having a clock generator, and counting down a clock generated by the clock generator; A stop judgment value setting device for setting a judgment value for stopping the converter section of the count value of the down counter, and comparing the judgment value set by the stop judgment value setting device with the count value of the up / down counter, A twelfth comparator that outputs a signal for stopping the converter section when the count value reaches the determination value, and a voltage signal output from the signal generator is not input for a predetermined time. The converter device according to claim 12, further comprising: a reset circuit that starts counting down of the clock.