JP2002281763A - Control device for power conversion circuit - Google Patents

Abstract

(57) [Summary] As a control device for controlling a semiconductor power conversion circuit, a versatile power conversion circuit control device is provided irrespective of the control method of the conversion circuit. An A-system analog signal processing circuit for processing an A-system analog signal, a B-system analog signal processing circuit for processing a B-system analog signal,
A-system hard protection circuit 203, B-system hard protection circuit 303, changeover switches 11 and 13
, An analog / digital conversion circuit 113, and a microcomputer 1 for switching a control method together with processing required for power conversion
5 and a gate output circuit 117 that outputs a gate signal 123 under the control of the microcomputer 15. The microcomputer 15 switches the switches 11 and 13 in accordance with the control method of the power conversion circuit, so that the A method or the B method is used. A control device for a power conversion circuit, wherein one control device can handle any of the methods.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion circuit control device, and more particularly, to a power conversion circuit for controlling a semiconductor power conversion circuit which converts and supplies power required for a load by switching semiconductor elements. It relates to a control device.

[0002]

2. Description of the Related Art In recent years, most power conversion devices use semiconductor elements for circuit portions that are actually performing power conversion.
A power conversion circuit using such a semiconductor element is called a semiconductor power conversion circuit. A control device for the power conversion circuit (hereinafter, simply referred to as a control device) controls the power conversion circuit and stops power when an abnormality occurs.

FIG. 8 is a block diagram showing a basic system configuration of a typical conventional power converter.

[0004] The semiconductor power conversion circuit 103 is connected to, for example, a motor 101 as a load device.
1 supplies the necessary power. Semiconductor power conversion circuit 103
Is constituted by a thyristor or a semiconductor element such as GTO or IGBT, and is connected to a control device 110 for controlling the semiconductor element.

The control device 110 inputs an analog signal together with the control feedback signal 121 to the analog signal processing circuit 111 to perform a predetermined signal conversion. The analog / digital conversion circuit 113 converts the analog signal into a digital signal, and converts the analog signal into a digital signal. To enter. Necessary processing is performed in the microcomputer 115, and a gate signal 123 for switching control of a semiconductor element in the semiconductor power conversion circuit is output from the gate output circuit 117 accordingly. In the semiconductor power conversion circuit 103, necessary electric power is supplied to the electric motor 101 by the semiconductor element switched by the gate signal 123.

[0006] When the control feedback signal 121 indicates a level that causes a failure of the device, the control device executes processing such as turning off the gate signal 123 at high speed. This is generally called a protection operation.

[0007] Such a protection operation takes too much time in software processing of the microcomputer 115, and cannot provide necessary protection. This is because the processing of the microcomputer 115 is generally a sample value control based on a periodic interrupt signal, and thus does not correspond to a processing that requires a higher speed than the sampling interval as in the protection operation of the apparatus. is there.

Therefore, the control device 110 is provided with a dedicated hard protection circuit 119 for performing a protection operation. The control feedback signal 121 is input to the hard protection circuit 119, and the control feedback signal 121 is supplied to the device. In the case of indicating a level leading to a failure, the hardware protection circuit 119 outputs the failure detection signal 125 to the microcomputer 115 and the gate output circuit 117.
When the failure detection signal 125 is input to the microcomputer 115, the microcomputer 115 performs a process of turning off all the subsequent gate signals by interrupt processing, and the gate output circuit 1
At 17, the gate signal 12 is output by the failure detection signal 125.
3 is stopped. Thereby, in the semiconductor power conversion circuit 103, the gate signal to the semiconductor element is turned off,
Subsequent power conversion processing is stopped.

Incidentally, there are a plurality of control systems in the semiconductor power conversion circuit, and the input to the control device often differs depending on the control system. Therefore, conventionally, individual control devices corresponding to various control methods are used.

FIGS. 9A and 9B are diagrams showing control devices having different control methods. FIG. 9A is a block diagram of a control device using the A control method, and FIG. 9B is a block diagram of a control device using the B control method. FIG.

The control device 200 for the A-system control includes an A-system analog signal processing circuit 201, and the A-system analog signal processing circuit 201 performs analog signal processing required for the A-control type semiconductor power conversion circuit. The signal processed by the A-system analog signal processing circuit 201 is transmitted to the analog / digital conversion circuit 11 similarly to the basic system configuration.
After being converted into a digital signal by the microcomputer 3, the microcomputer 115
, And necessary processing is performed, and a gate signal 123 required for power conversion is output by the gate output circuit 117.

Here, the processing of the microcomputer 115 is the same as that of the above-described basic configuration, and processing that requires high-speed longer than the sampling interval, such as the protection operation of the apparatus, cannot be executed. Therefore, the A-system hardware protection circuit 203
When the control feedback signal 121 indicates a level that causes a failure of the device, the failure detection signal 125 from the A-system hard protection circuit 203 is transmitted to the microcomputer 115 and the gate output circuit 11.
7 to perform the protection operation at high speed.

Similarly, the B-system controller 300 converts the signal processed by the B-system analog signal processing circuit 301 into a digital signal by the analog / digital conversion circuit 113 and then inputs the digital signal to the microcomputer 115 to perform necessary processing. After that, the gate signal 1 is output from the gate output circuit 117.
23 is output. The operation protection is performed by the failure detection signal 125 output from the B-system hard protection circuit 303.

[0014]

By the way, even in the case of such a control device that requires individual correspondence depending on the control method, almost the same circuit can be applied to the microcomputer and the gate output circuit regardless of the control method. The analog signal processing circuit and the hardware protection circuit need to be different depending on each control method. On the other hand, the complexity of the development and the degree of difficulty are higher in the former circuit centered on the microcomputer, and the latter analog-related circuit is relatively easier to develop.

Therefore, if only analog circuits that are relatively easy to develop can be developed in correspondence with a plurality of control methods, the development cost can be reduced. Since there is no corresponding general-purpose device, if the control method is different, a circuit centering on a microcomputer must be developed for each control method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a versatile control device for a power conversion circuit that does not depend on a control method as a control device for controlling a semiconductor power conversion circuit. The purpose is to do.

[0017]

According to a first aspect of the present invention, there is provided a power conversion circuit control device for controlling a power conversion circuit using a semiconductor device, wherein a plurality of control schemes different from each other are provided. In accordance with a plurality of analog signal processing means, provided for each of the plurality of control methods, a plurality of abnormality detection means for detecting an abnormal signal and outputting a failure detection signal, and according to the control method used, From a plurality of analog signal processing units and the plurality of abnormality detection units, a control method selection unit that selects an analog signal processing unit and an abnormality detection unit corresponding to any one of the control methods,
The power conversion circuit is controlled based on a signal from the analog signal processing means selected by the control method selection means, and the power conversion circuit is controlled by a failure detection signal from an abnormality detection means selected by the control method selection means. And control means for controlling to stop.

According to the present invention, a plurality of analog signal processing means corresponding to various control methods and a plurality of abnormality detecting means are provided, and the control method selecting means selects the control method using these means. One control device is intended to support various control methods.

According to a second aspect of the present invention, there is provided a power conversion circuit control device for controlling a power conversion circuit using a semiconductor device, comprising a plurality of analog circuits corresponding to a plurality of different control systems. A signal processing unit, one abnormality detection unit that detects an abnormal signal and outputs a failure detection signal in common with the plurality of control systems, and a control system to be used from among the plurality of analog signal processing units. Accordingly, a control method selecting means for selecting an analog signal processing means corresponding to any one of the control methods, and controlling the power conversion circuit based on a signal from the analog signal processing means selected by the control method selecting means. Along with
Control means for controlling the power conversion circuit to stop in response to a failure detection signal from the abnormality detection means.

According to the present invention, a plurality of dedicated analog signal processing circuits corresponding to each control method are provided for analog signals, and the control method selection means selects one of the plurality of analog signal processing circuits according to a control method to be used. One is selected, and on the other hand, an abnormal signal is detected by a single abnormality detecting means as a common signal, so that one control device can cope with various control methods.

According to a third aspect of the present invention, there is provided a power conversion circuit control device for controlling a power conversion circuit using a semiconductor element, wherein the plurality of calculation unit circuits perform analog addition / subtraction multiplication. General-purpose analog calculation means comprising: and, from among the general-purpose analog calculation means, selecting the calculation unit circuit necessary for calculating a process according to a control method to be used, and performing analog signal processing of the control method to be used. Control method selection means for causing the general-purpose analog calculation means to execute, one abnormality detection means that is common to a plurality of control methods, detects an abnormal signal, and outputs a failure detection signal, and Control means for controlling the power conversion circuit based on a signal and controlling the power conversion circuit to be stopped by a failure detection signal from the abnormality detection means , And summarized in that with.

According to the present invention, there is provided a general-purpose analog calculation circuit comprising a plurality of calculation unit circuits for performing analog addition, subtraction, multiplication and addition, and the control unit selection means performs the necessary processing in accordance with the control system. By switching, one control device can cope with various control methods without providing a dedicated circuit for each control method.

According to a fourth aspect of the present invention, there is provided a power conversion circuit control device for controlling a power conversion circuit using a semiconductor device, wherein an analog signal required for a control method to be used is selected. Control method selection means, analog / digital conversion means for converting an analog signal selected by the control method selection means into a digital signal, and a failure detection signal for detecting an abnormality based on the digital signal from the analog / digital conversion means A digital abnormality detection means for outputting a signal, and controlling the power conversion circuit based on a digital signal from the analog / digital conversion means, and stopping the power conversion circuit by a failure detection signal from the digital abnormality detection means. And control means for controlling.

According to the present invention, the analog signal required for the control method used by the control method selection means is selected, input to the analog / digital conversion means, and converted into a digital signal. The purpose of the present invention is to make it possible to eliminate the need for an analog signal processing circuit and to make it possible for one control device to cope with various control methods by digital processing.

According to a fifth aspect of the present invention, there is provided a power conversion circuit control device for controlling a power conversion circuit using a semiconductor element, wherein an analog signal required for a control system to be used is selected. Control method selecting means, first analog / digital converting means for converting an analog signal selected by the control method selecting means into a digital signal, and converting the analog signal selected by the control method selecting means into a first analog / digital signal. A second analog / digital converter for converting the digital signal to a digital signal at a higher speed than the digital converter, and a digital abnormality detection for detecting an abnormality based on the digital signal from the second analog / digital converter and outputting a failure detection signal Means for controlling the power conversion circuit based on a digital signal from the first analog / digital conversion means Rutotomoni, and summarized in that and a control means for controlling to stop the power conversion circuit by the failure detection signal from the digital abnormality detecting means.

According to the present invention, the semiconductor power conversion circuit is controlled by the digital signal converted by the first analog / digital conversion means, and the failure is more quickly caused by the digital signal converted by the second analog / digital conversion means. By using high-speed and high-accuracy analog / digital conversion means only for the analog / digital conversion means used for fault detection that requires high-speed processing, the manufacturing cost of the apparatus is reduced, and various controls are performed by digital processing. It is intended that one control device can cope with the system.

According to a sixth aspect of the present invention, there is provided a power conversion circuit control device for controlling a power conversion circuit using a semiconductor device, wherein at least one of a plurality of different control methods is used. Analog signal processing means corresponding to a control method, a plurality of abnormality detection means corresponding to the at least one control method, detecting an abnormal signal and outputting a failure detection signal, and an analog processing means provided outside and Expansion connection means for taking in a signal from the abnormality detection means, and an output from the analog signal processing means and the abnormality detection means and an output from the expansion means,
A control method selecting means for selecting one according to a control method to be used, and controlling the power conversion circuit based on a signal from the analog signal processing means or the extended connection means selected by the control method selecting means. And a control unit for controlling the power conversion circuit to stop in response to a failure detection signal selected from the abnormality detection unit or the expansion connection unit selected by the control method selection unit.

According to the present invention, analog signal processing means and abnormality detection means corresponding to at least one control method are provided,
Furthermore, by providing analog signal processing means by another control method provided outside and extended connection means for inputting a signal from the abnormality detection means, the device itself can cope with at least one control method. For other control methods, only analog signal processing means and abnormality detection means are prepared outside, and signals from these are input via expansion connection means so that one control device can be used for various control methods. They try to be able to respond.

According to a seventh aspect of the present invention, there is provided a power conversion circuit control device for controlling a power conversion circuit using a semiconductor device, wherein a plurality of analog signals corresponding to the plurality of power conversion circuits are provided. A processing unit, an abnormality detection unit that detects an abnormal signal and outputs a failure detection signal, and processes the signals from the plurality of analog signal processing units in parallel to control the plurality of power conversion circuits; Control means for controlling the plurality of power conversion circuits to stop in response to a failure detection signal from the detection means.

The present invention has a plurality of analog signal processing means, and controls a plurality of semiconductor power conversion circuits by a single power conversion circuit control device by processing signals from the plurality of analog signal processing means in parallel. And, when the abnormal signal detection means detects the abnormal signal, by stopping the supply of power to the semiconductor power conversion circuit that is being controlled, a plurality of semiconductor power conversion circuits by one control device That's what you want to control.

[0031]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings referred to in the embodiments described below, the same reference numerals are given to components having the same functions as those in the drawings referred to in the related art described above.

(First Embodiment) FIG. 1 shows a first embodiment of a general-purpose control device capable of coping with various control systems by applying the power conversion circuit control device according to the present invention. FIG.

The general-purpose control device 1 includes an A-system analog signal processing circuit 20 for processing an analog signal for the A-control system.
1, a B-system analog signal processing circuit 301 for processing an analog signal for the B control system, an A-system hard protection circuit 203 for the A control system, a B-system hard protection circuit 303 for the B control system, and an analog signal Switches 11 and 1 for switching between the A system and the B system according to the control system
3, an analog / digital conversion circuit 113 for converting an analog signal into a digital signal, and a microcomputer 15 for performing control processing necessary for power conversion and switching control of a control method.
And a gate output circuit 117 that outputs a gate signal 123 under the control of the microcomputer 15.

Here, the A control method or the B control method is as follows:
The control methods are different from each other, such as a PWM (pulse width modulation) control method and a vector control method.

Next, the operation of the general-purpose control device 1 will be described.

First, the microcomputer 15 is set according to the control method of the semiconductor power conversion circuit to which the general-purpose control device 1 is connected. As a result, the control system changeover signal 17 is output from the microcomputer 15, and the control system changeover switches 11 and 1 are controlled so that either the A system or the B system is selected according to the control system of the semiconductor power conversion circuit.
3 switches.

When the power conversion operation is started, the analog signal for the A control system is converted to the A system analog signal processing circuit 201.
, While the analog signal for the B control system is input to the B system analog signal processing circuit 301.

The A-system analog signal processing circuit 20
The analog signal output from the 1- or B-system analog signal processing circuit 301 is switched to the analog / digital conversion circuit 113 by switching the changeover switch 11 in response to the control mode switching signal 17 from the microcomputer 15. Is entered.

The analog signal input to the analog / digital conversion circuit 113 is converted into a digital signal here, and then input to the microcomputer 15 to perform necessary processing. The gate signal 123 is output from the gate output circuit 117 by the processing of the microcomputer 15.

On the other hand, the A-system hard protection circuit 203 and the B-system hard protection circuit 303 have A
An analog signal output from the system analog signal processing circuit 201 or the B system analog signal processing circuit 301 is input. When a signal that causes the device to fail is detected based on the analog signal, a failure detection signal 125 is output. Is output. The output failure detection signal 125 is input to the microcomputer 15 and the gate output circuit 117 by the changeover switch 13, and the output of the gate signal 123 is stopped.

As described above, according to the first embodiment, the A-system analog signal processing circuit 2 is provided on one general-purpose control device.
01 and B-system analog signal processing circuit 301, and A-system hard protection circuit 203 and B-system hard protection circuit 303
Is provided, and these control methods are switched by the software-based switching operation of the microcomputer 15. Therefore, a general-purpose control device that can respond to each method with one control device can be provided.

In the first embodiment, the general-purpose control device applied to the A control system and the B control system has been described. However, a plurality of analog signal processing circuits and a hardware protection circuit are further incorporated. Thus, the present invention can be applied to more control methods.

(Second Embodiment) FIG. 2 is a block diagram showing a second embodiment of a general-purpose control device to which a control device for a power conversion circuit according to the present invention is applied.

The general-purpose control device 2 shown in FIG. 2 includes an A-system analog signal processing circuit 201 for processing analog signals according to the A-control system, a B-system analog signal processing circuit 301 for processing analog signals for the B-control system, C type analog signal processing circuit 4 for processing analog signals for C control type
01, a common analog signal processing circuit 501 for processing an analog signal that can be used in common for each control method, and a control method switch group 2 for switching for each control method
1, a general-purpose hardware protection circuit 23 common to each system, an analog / digital conversion circuit 113 for converting an analog signal into a digital signal, a microcomputer 15 for performing control processing required for power conversion and switching control of a control method, and a microcomputer. 1
And a gate output circuit 117 that outputs a gate signal 123 in accordance with the control of No. 5.

Next, the operation of the general-purpose control device 2 will be described.

First, the microcomputer 15 is set according to the control method of the semiconductor power conversion circuit to which the general-purpose control device 2 is connected. As a result, the control mode switching signal 17 is output from the microcomputer 15 and the control mode switching switch group 21 is selected so that one of the A mode, the B mode, and the C mode is selected according to the control mode of the semiconductor power conversion circuit. Switches.

The A-system analog signal processing circuit 20
1. A dedicated analog signal is input to each of the B-system analog signal processing circuit 301 and the C-system analog signal processing circuit 401, and the common analog signal processing circuit 501
Is supplied with an analog signal that can be used in common for each control method.

The control mode changeover switch group 21 converts a signal from the analog signal processing circuit corresponding to each control mode into an analog / digital conversion circuit 113 and a general-purpose hardware protection circuit 2.
Output to 3. This switching is performed in a software manner by a control system switching signal 17 output from the microcomputer 15.

The analog / digital conversion circuit 113 converts the input analog signal into a digital signal and outputs the digital signal to the microcomputer 15. The microcomputer 15 performs necessary control processing and outputs a gate signal 123 from the gate output circuit 117.

When the general-purpose hardware protection circuit 23 detects a signal that may lead to a device failure, the failure detection signal 1
25 is output to the microcomputer 15 and the gate output circuit 117. The output failure detection signal 125 is input to the microcomputer 15 and the gate output circuit 117 to output the gate signal 1
23 is stopped.

As described above, according to the second embodiment, the A-system analog signal processing circuit 201, the B-system analog signal processing circuit 301, and the C-system analog signal processing circuit 301 that perform analog signal processing for each control system are provided on one control device. An analog signal processing circuit 401, a common analog signal processing circuit 501 for processing an analog signal that can be used in common for each control method,
Since a general-purpose hardware protection circuit 23 common to each system is provided, and these control systems are switched by a software switching operation by the microcomputer 15, a general-purpose control device capable of coping with each system by one controller is provided. be able to.

In the second embodiment, the general-purpose control device applied to the A control system, the B control system, and the C control system has been described, but a plurality of dedicated analog signal processing circuits may be further incorporated. The number of circuits can be reduced as the number of common analog processes increases.

(Third Embodiment) FIG. 3 is a block diagram showing a third embodiment of a general-purpose control device to which a control device for a power conversion circuit according to the present invention is applied.

The general-purpose control device 3 shown in FIG. 3 includes a general-purpose analog calculation circuit 31 for processing analog signals of various control systems, a control system changeover switch group 21 for switching inputs to the general-purpose analog calculation circuit 31, and , A general-purpose hardware protection circuit 23 common to each system, and an analog / digital conversion circuit 113 for converting an analog signal to a digital signal
A microcomputer 15 for performing control processing switching control together with control processing required for power conversion, and a gate output circuit 117 for outputting a gate signal 123 under the control of the microcomputer 15
And consisting of

Here, the general-purpose analog calculation circuit 31 is a circuit having a plurality of calculation unit circuits for performing analog addition, subtraction, multiplication, and the like. By switching inputs and outputs of the plurality of calculation unit circuits, desired analog processing is performed. It is something to be executed. In the third embodiment, the input / output switching for the plurality of calculation unit circuits is switched by the control method switch group 21 so that analog processing corresponding to the control method to be used can be performed by the general-purpose analog calculation circuit 3.
1 is executed.

Next, the operation of the general-purpose control device 3 will be described.

In the third embodiment, the input analog input signal 35 is all connected to the control mode changeover switch group 21. The input / output of the general-purpose analog calculation circuit 31 is also connected to the control mode changeover switch group 21. These inputs and outputs are switched according to the control method, necessary analog calculations are performed by the general-purpose analog calculation circuit 31, and the output is input to the analog / digital conversion circuit 113 and the general-purpose hardware protection circuit 23. Switching of the control method is performed in a software manner by a control method switching signal 17 from the microcomputer 15.

The analog signal processed by the general-purpose analog calculation circuit 31 is converted into an analog / digital converter 11
In step 3, the microcomputer 15 performs necessary control and outputs a gate signal from the gate output circuit 117.

On the other hand, when the general-purpose hardware protection circuit 23 detects a signal that may lead to a failure of the device, the failure detection signal 1
25 is output. The output failure detection signal 125 is input to the microcomputer 15 and the gate output circuit 117,
The output of the gate signal 123 is stopped.

As described above, according to the third embodiment, the general-purpose analog calculation circuit 31 that performs the processing of the analog signal for each control method by calculation is provided, and the switching for each control method is performed by the microcomputer 15 in a soft switching operation. Therefore, it is possible to provide a general-purpose control device that can correspond to each control method without requiring a dedicated analog signal processing circuit corresponding to each control method.

In the third embodiment, for example, one or a plurality of programmable analog ICs are used in configuring the control system changeover switch group 21 for switching the control system and the general-purpose analog calculation circuit 31. Thus, the number of parts can be further reduced.

(Fourth Embodiment) FIG. 4 is a block diagram showing a fourth embodiment of a general-purpose control device to which a control device for a power conversion circuit according to the present invention is applied.

The general-purpose control device 4 shown in FIG. 4 includes a high-speed and high-precision analog / digital conversion circuit 41 for converting an analog signal to a digital signal with high speed and high accuracy, and a high-speed and high-precision analog / digital conversion circuit 41. A control system changeover switch group 21 for performing input switching, a digital processing general-purpose hardware protection circuit 43 for performing a protection operation by digital processing, a microcomputer 15 for performing control processing switching control together with control processing necessary for power conversion, A gate output circuit 117 that outputs a gate signal 123 according to control.

Next, the operation of the general-purpose control device 4 will be described.

The analog input signal 35 is all connected to the control system changeover switch group 21. Which analog input signal 35 is used for each control method is controlled by a control method switching signal 17 output from the microcomputer 15 in a software manner. This is because the signals required for processing differ depending on the control method. Here, unnecessary signals are cut depending on the control method, and the number of signals input to the high-speed and high-precision analog / digital conversion circuit 41 is reduced. This is to reduce the load on the analog / digital conversion circuit 41.

High-speed and high-precision analog / digital conversion circuit 4
The signal input to 1 is converted into a digital signal with high speed and high accuracy. The converted digital signal is input to the microcomputer 15 and the digital processing general-purpose hardware protection circuit 43.

The microcomputer 15 receives a digital signal as control information, performs necessary control here, and outputs a gate signal 123 from the gate output circuit 117.

On the other hand, the digital processing general-purpose hardware protection circuit 4
3 performs a high-speed protection operation based on the input digital signal and outputs a failure detection signal 125. The output failure detection signal 125 is input to the microcomputer 15 and the gate output circuit 117, and the output of the gate signal 123 is stopped.

As described above, according to the fourth embodiment, a signal required in each control method is a high-speed, high-precision analog /
The digital conversion circuit 41 performs high-speed and high-precision digital conversion, and performs all subsequent processing by digital processing. Therefore, it is possible to provide a general-purpose control device that can cope with each system with one control device without providing an analog signal processing circuit corresponding to various control systems.

In the fourth embodiment, for example, the digital processing general-purpose hardware protection circuit 43 is configured by a programmable digital IC, so that the number of components can be further reduced.

(Fifth Embodiment) FIG. 5 is a block diagram showing a fifth embodiment of a general-purpose control device to which the power conversion circuit control device according to the present invention is applied.

The general-purpose control device 5 shown in FIG. 5 includes a high-precision analog / digital conversion circuit 51 for converting an analog signal to a digital signal with high accuracy, and a high-speed analog / digital conversion circuit for similarly converting to a digital signal at high speed. Digital conversion circuit 5
3, a control system changeover switch group 21 for switching inputs to a high-precision analog / digital conversion circuit 51 and a high-speed analog / digital conversion circuit 53, a digital processing general-purpose hardware protection circuit 43, and control processing required for power conversion. The microcomputer 15 includes a microcomputer 15 that performs switching control of a control method, and a gate output circuit 117 that outputs a gate signal 123 under the control of the microcomputer 15.

Next, the operation of the general-purpose control device 5 will be described.

The analog input signal 35 is all connected to the control system changeover switch group 21. This is because the signals required for processing differ depending on the control method. Here, unnecessary signals are cut depending on the control method, and high-precision analog /
This is because the number of signals input to the digital conversion circuit 51 and the high-speed analog / digital conversion circuit 53 is reduced to reduce the load on these circuits. Which analog input signal 35 is used for each control method is controlled by a control method switching signal 17 output from the microcomputer 15 in a software manner.

The output from the control system changeover switch group 21 is input to a high-precision analog / digital conversion circuit 51 and a high-speed analog / digital conversion circuit 53.

The signal converted into a digital signal by the high-precision analog / digital conversion circuit 51 is input to the microcomputer 15, performs necessary processing, and outputs a gate signal from the gate output circuit 117.

On the other hand, the high-speed analog / digital conversion circuit 5
The digitally converted signal at 3 is input to a digital processing general-purpose hard protection circuit 43. The digital processing general-purpose hardware protection circuit 43 performs a protection operation at high speed and outputs a failure detection signal 125.

In general, the high-speed and high-precision analog / digital conversion circuit 41 used in the above-described fourth embodiment is expensive, but the high-speed and high-precision analog / digital conversion circuit 41 is a high-precision analog / digital conversion circuit in which one of the high-speed and the accuracy is slightly reduced. The analog / digital conversion circuit 51 and the high-speed analog / digital conversion circuit 53 are relatively inexpensive. The digital signal as control information to be input to the microcomputer 15 needs to have high accuracy, but does not require high speed. On the other hand, the digital signal input to the digital processing general-purpose hardware protection circuit 43 needs to be high speed, but does not require much accuracy.

For this reason, the fifth embodiment uses a high-precision analog / digital conversion circuit 51 for processing by the microcomputer 15.
By providing the high-speed analog / digital conversion circuit 53 for the processing of the digital processing general-purpose hardware protection circuit 43, a general-purpose control device using digital processing that does not require analog signal processing circuits corresponding to various control systems can be provided. It is provided by a cheaper component configuration.

(Sixth Embodiment) FIG. 6 is a block diagram showing a sixth embodiment of a general-purpose control device to which a control device for a power conversion circuit according to the present invention is applied.

The general-purpose control device 6 shown in FIG. 6 includes an A-system analog signal processing circuit 201 for processing an A-control analog signal, and an A-system hard protection circuit 20 for the A control system.
3 and an extension connector 61 for inputting an analog signal and a failure detection signal processed by another control method.
And the A-system analog signal processing circuit 20 according to the control system.
Switches 11 and 13 for switching a signal from the first connector 1 and a signal from the extension connector 61, and an analog / digital conversion circuit 1 for converting an analog signal into a digital signal.
13, a microcomputer 15 for performing control processing switching control together with control processing required for power conversion, and a gate output circuit 1 for outputting a gate signal 123 according to the control of the microcomputer 15.
17

In the sixth embodiment, an extended analog signal processing circuit 63 for processing an analog signal for the B control system is prepared as an external analog signal processing circuit.

The extended analog signal processing circuit 63 includes a B-system analog signal processing circuit 301 for processing an analog signal for the B control system, a B-system hard protection circuit 303 for the B control system, and an extended connector of the general-purpose control device 6. And an extension connector 65 for connecting to the extension connector 61.

The control method of the analog signal processing circuit provided by the extended analog signal processing circuit 63 may be a control method other than the B control method described above.

Next, the operation of the general-purpose control device 6 will be described.

First, the microcomputer 15 is set according to the control method of the semiconductor power conversion circuit to which the general-purpose control device 6 is connected. Here, when the A control method is set, the changeover switches 11 and 13 switch the output from the A method analog signal processing circuit 201 and the output from the A method hard protection circuit 203 by the control method switching signal 17 from the microcomputer 15. Switch to select, while A
When a control method other than the control method is set, the mode is switched to the extension connector 61 side.

When the A control method is selected, when the power conversion operation is started, the analog signal for the A control method is A
After being input to the analog signal processing circuit 201 and processed, and the output thereof is input to the analog / digital conversion circuit 113 and converted into a digital signal, necessary processing is performed by the microcomputer 15 and the gate output circuit 117 Gate signal 123 is output.

On the other hand, when a control method other than the A control method is selected, a signal subjected to analog signal processing by another control method (here, the B control method) is transmitted from the extended analog signal processing circuit 63 to the extended connector. The signal is input to the analog / digital conversion circuit 113 via the switch 61 and the switch 11 and is converted into a digital signal. The microcomputer 15 performs necessary processing, and the gate output circuit 117 outputs the gate signal 123.

In the protection operation, when the A control method is selected, a failure detection signal 125 is output when a signal having a level that causes a failure of the device is input to the A method hard protection circuit 203. The output failure detection signal 125 is input to the microcomputer 15 and the gate output circuit 117 by the changeover switch 13, and the output of the gate signal is stopped. On the other hand, in the case of a control method other than the A control method, the failure detection signal 125 is transmitted from the extended analog signal processing circuit 63 via the extended connector 61 and the switch 13 to the microcomputer 15.
And input to the gate output circuit 117 to stop the output of the gate signal.

As described above, the general-purpose control device 6 according to the sixth embodiment includes, on the circuit board of the general-purpose control device 6, at least one A-system analog signal processing circuit 201 and the analog signal processing circuit 201. A corresponding to the circuit
A system hardware protection circuit 203 is provided, and an extension connector 61 is provided to cope with another control system, so that an analog signal processed signal and a failure detection signal for hardware protection are externally received. The switching is performed by the microcomputer 15 according to the control method.

According to this configuration, when the general-purpose control device 6 which normally supports only the A control system needs to support another control system, an analog signal processing circuit using the other control system is externally provided. And an extended analog signal processing circuit 63 having a hardware protection circuit, and by inputting a signal from the extended analog signal processing circuit 63 from the extended connector 61, it is possible to cope with other control methods.

As described above, according to the sixth embodiment, the general-purpose control device 6 is configured with the minimum necessary analog circuits, and is externally provided with the extended analog signal processing circuit 63 as necessary.
, Various control methods can be supported. This can reduce the number of circuits of the general-purpose control device 6 itself.

Note that such a configuration can be realized by providing a plurality of extension connectors for other control systems in the general-purpose control devices according to the first to fifth embodiments described above. In addition to being compatible with the analog control system, the extension connector can be used to support other control systems that are not on the board.

In the sixth embodiment, a plurality of extension connectors may be provided. By providing a plurality of extension connectors, it is possible to apply to a control system having more analog input signals.

(Seventh Embodiment) FIG. 7 is a block diagram showing a seventh embodiment of a general-purpose control device to which a control device for a power conversion circuit according to the present invention is applied.

The general-purpose control device 7 shown in FIG. 7 includes an analog signal processing circuit 71 for a first system, an analog signal processing circuit 73 for a second system, and a common analog signal processing circuit for processing a signal common to each system. 75, a control system changeover switch group 21 for switching input signals, a general-purpose hardware protection circuit 77 common to each series, and an analog / digital conversion circuit 113 for converting an analog signal to a digital signal.
A microcomputer 15 for controlling the switching of the control sequence together with a control process required for power conversion, and a gate signal 123a to the first-series semiconductor power conversion circuit under the control of the microcomputer 15.
And a second-series gate output circuit 117 that outputs a gate signal 123b to a second-series semiconductor power conversion circuit under the control of the microcomputer 15.
17b.

Here, the analog signal processing circuit 71 for the first stream and the analog signal processing circuit 73 for the second stream are
All correspond to the same control method.

Next, the operation of the general-purpose control device 7 will be described.

First, when the power conversion operation is started, the first
The analog signal for the series is input to the analog signal processing circuit 71 for the first series, and the analog signal for the second series is
It is input to the analog signal processing circuit 73 for the stream.

At this time, the microcomputer 15 outputs the signal output from the analog signal processing circuit 71 for the first series and the signal output from the analog signal processing circuit 73 for the second series at predetermined time intervals by time division. To the changeover switch group 21 so as to select
7 is output. As a result, the microcomputer 15 performs the first series of processing and the second series of processing in parallel by time division. In addition, the predetermined time interval at the time division is
For example, it is a time interval required for the microcomputer 15 to perform the sample value control.

Thus, the signals output from the first-series analog signal processing circuit 71 and the common analog signal processing circuit 75 are input to the analog / digital conversion circuit 113 and converted into digital signals.
, The gate signal 123a is output from the gate output circuit 117a for the first stream, and the signal output from the analog signal processing circuit 73 and the common analog signal processing circuit 75 for the second stream. Is input to the analog / digital conversion circuit 113 and is converted into a digital signal.
Gate signal 123 from the series gate output circuit 117b
b is output.

In the protection operation, a failure detection signal 125 is output when a signal having a level that causes a failure of the device is input to the general-purpose hardware protection circuit 77. The output failure detection signal 125 is input to the microcomputer 15 and the gate output circuits 117a and 117a for the first system and the second system.
17b, the output of the gate signal is stopped.

This protection operation has the same control method for both systems, so that a single general-purpose hardware protection circuit 77 may be used for a plurality of systems. Then, this general-purpose hardware protection circuit 7
When a situation occurs in which the system 7 functions, the power conversion processing is stopped for both systems in consideration of safety.

As described above, according to the seventh embodiment,
One microcomputer 15 processes signals from two series of analog signal processing circuits in a time-division manner, so that conventionally, if there are a plurality of series, an independent control device is required for each series. The control can be performed by one general-purpose control device 7.

In the seventh embodiment, the case where the two series of semiconductor power conversion circuits are controlled by one general-purpose control device 7 has been described. However, as long as the processing speed of the microcomputer 15 permits, more semiconductor power conversion circuits can be used. It is also possible to control the conversion circuits simultaneously.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.
For example, when a plurality of dedicated analog signal processing circuits corresponding to each control method are provided, a plurality of analog signal processing circuits may be provided for one control method. This allows a plurality of power conversion circuits to be simultaneously controlled by a single control device regardless of the control method. In addition, various modifications are possible within the scope of the technical idea of the present invention.

[0107]

As described above, according to the present invention, as a control device for controlling a semiconductor power conversion circuit, it can be used for any semiconductor power conversion circuit regardless of the control method. It is possible to provide a control device for a power conversion circuit having a certain function.

Further, according to the present invention, it is possible to provide a power conversion circuit control device capable of simultaneously controlling a plurality of semiconductor power conversion circuits.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control device for a power conversion circuit according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a control device for a power conversion circuit according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a control device for a power conversion circuit according to a third embodiment of the present invention.

FIG. 4 is a block diagram illustrating a control device for a power conversion circuit according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a control device for a power conversion circuit according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram illustrating a control device for a power conversion circuit according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram illustrating a control device for a power conversion circuit according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing a basic system configuration of a conventional power converter.

FIG. 9 is a block diagram showing a conventional control device for a power conversion circuit.

[Explanation of symbols]

 1, 2, 3, 4, 5, 6, 7 General-purpose control device 11, 13 Control mode switch 15 Microcomputer 17 Control mode switch signal 21 Control mode switch group 23 General-purpose hardware protection circuit 31 General-purpose analog calculation circuit 35 Analog input signal 41 High-speed high-precision analog / digital conversion circuit 43 Digital processing general-purpose hardware protection circuit 51 High-precision analog / digital conversion circuit 53 High-speed analog / digital conversion circuit 61 Expansion connector 63 Extended analog signal processing circuit 71 Analog signal processing circuit for first series 73 Analog signal processing circuit for second system 75 Common analog signal processing circuit 77 General-purpose hardware protection circuit 101 Motor 103 Semiconductor power conversion circuit 110 Controller 111 Analog signal processing circuit 113 Analog / digital conversion circuit 115 Myco 117, 117a, 117b Gate output circuit 119 Hardware protection circuit 121 Control feedback signal 123, 123a, 123b Gate signal 125 Failure detection signal 200 A system controller 201 A system analog signal processing circuit 203 A system hard protection circuit 300 B system controller 301 B-system analog signal processing circuit 303 B-system hardware protection circuit 401 C-system analog signal processing circuit 501 Common analog signal processing circuit

Claims (7)

[Claims] 1. A power conversion circuit control device for controlling a power conversion circuit using a semiconductor element, comprising: a plurality of analog signal processing means corresponding to a plurality of different control systems; and a plurality of analog signal processing means provided for each of the plurality of control systems. A plurality of abnormality detection means for detecting an abnormal signal and outputting a failure detection signal; and one of the plurality of analog signal processing means and the plurality of abnormality detection means according to a control method used. Control method selecting means for selecting analog signal processing means and abnormality detecting means corresponding to the two control methods, and controlling the power conversion circuit based on a signal from the analog signal processing means selected by the control method selecting means, A control system for controlling the power conversion circuit to stop in response to a failure detection signal from the abnormality detection unit selected by the control method selection unit. Power conversion circuit control device, characterized in that it comprises a means. 2. A control device for a power conversion circuit for controlling a power conversion circuit using a semiconductor element, comprising: a plurality of analog signal processing means corresponding to a plurality of mutually different control methods; One abnormality detection unit that detects an abnormal signal and outputs a failure detection signal; and among the plurality of analog signal processing units, an analog signal corresponding to any one of the control systems according to a control system to be used. A control method selecting means for selecting a processing means, and controlling the power conversion circuit based on a signal from the analog signal processing means selected by the control method selecting means, and controlling the power by a failure detection signal from the abnormality detecting means. A control unit for controlling the conversion circuit to stop, and a control device for the power conversion circuit. 3. A control device for a power conversion circuit for controlling a power conversion circuit using a semiconductor element, comprising: a general-purpose analog calculation means comprising a plurality of calculation unit circuits for performing analog addition / subtraction multiplication; Among them, a control method selecting means for selecting the calculation unit circuit necessary for calculating a process according to a control method to be used, and causing the general-purpose analog calculating means to execute analog signal processing of the control method to be used, and A common abnormality detection means for detecting an abnormal signal and outputting a failure detection signal; controlling the power conversion circuit based on a signal from the general-purpose analog calculation means; And control means for controlling the power conversion circuit to stop in response to a failure detection signal from the detection means. Apparatus. 4. A control device for a power conversion circuit for controlling a power conversion circuit using a semiconductor element, wherein: a control method selection means for selecting an analog signal required for a control method to be used; Analog / digital conversion means for converting the analog signal into a digital signal, digital abnormality detection means for detecting an abnormality based on the digital signal from the analog / digital conversion means and outputting a failure detection signal, and the analog / digital conversion Control means for controlling the power conversion circuit based on a digital signal from the means, and controlling to stop the power conversion circuit by a failure detection signal from the digital abnormality detection means. Control device for conversion circuit. 5. A control device for a power conversion circuit for controlling a power conversion circuit using a semiconductor element, wherein the control method selection means selects an analog signal necessary for a control method to be used, and the control method selection means selects the analog signal. A first analog / digital conversion means for converting the analog signal into a digital signal, and a second analog / digital conversion means for converting the analog signal selected by the control method selection means into a digital signal at a higher speed than the first analog / digital conversion means. An analog / digital conversion unit, a digital abnormality detection unit that detects an abnormality based on a digital signal from the second analog / digital conversion unit and outputs a failure detection signal, The power conversion circuit is controlled based on a digital signal, and a fault signal from the digital abnormality detecting means is output. Power conversion circuit control apparatus characterized by comprising a control means for controlling to stop the power conversion circuit by the detection signal. 6. A control device for a power conversion circuit for controlling a power conversion circuit using a semiconductor element, comprising: an analog signal processing means corresponding to at least one of a plurality of different control methods; A plurality of abnormality detecting means for detecting an abnormal signal and outputting a failure detection signal corresponding to one of the two control methods; an externally provided analog processing means and an extended connection means for taking in signals from the abnormality detecting means; A control system selection unit that selects one of an output from the analog signal processing unit and the abnormality detection unit and an output from the expansion unit in accordance with a control system to be used; Controlling the power conversion circuit based on a signal from the analog signal processing means or the extended connection means, and Power conversion circuit control apparatus characterized by comprising a control means for controlling to stop the power conversion circuit by the failure detection signal from the selected abnormality detecting means or extension connection means by-option means. 7. A power conversion circuit control device for controlling a power conversion circuit using a semiconductor element, comprising: a plurality of analog signal processing means corresponding to the plurality of power conversion circuits; and a failure detection signal for detecting an abnormal signal. Abnormality detecting means for outputting a signal from the plurality of analog signal processing means in parallel to control the plurality of power conversion circuits, and the plurality of power conversion circuits based on a failure detection signal from the abnormality detection means. Control means for controlling so as to stop, and a control device for a power conversion circuit.