JPS62135271A - Forced cooling semiconductor converter - Google Patents

Abstract

PURPOSE:To continue operation by the operation control with the reduced output even on the single trouble of cooling trouble by providing an operation and stoppage function in which the operation and stoppage conditions of a cooling device are interlocked with a gate firing-circuit. CONSTITUTION:Gate firing-circuits 5-1-5-3 receive a control signal from a pulse phase-shifting circuit 6, conduct pulse width control and output gate signals. The gate firing-circuits 5-1-5-3 are operated or stopped by cooling-fan operation and stoppage condition signals 4-1a-4-3a from cooling-fan power switched 4-1-4-3. DC output currents from a power converter are detected by a current detecting circuit 8, and a detecting signal is fed back to a control circuit 7 and output currents are controlled. The current detecting circuit 8 conducts current limiting operation by the operation and stoppage condition signals 4-1a-4-3a for a cooling device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention directly relates to a semiconductor power converter device using a forced cooling method for controlling power, and particularly relates to a semiconductor power converter device that uses a forced cooling method to control power. The present invention relates to semiconductor conversion equipment suitable for protection and safe operation control.

(Prior art) In conventional semiconductor converters, when the capacity increases, semiconductor converters are connected in parallel, and when semiconductor elements are cooled by air, they are equipped with a cooling fan to form a power converter. .

Note that related devices of this type include, for example,
An example is the air-cooled thyristor converter described in Japanese Patent No. 993244.

FIG. 2 is a block diagram of a conventional semiconductor power conversion device.

[Problem that the invention seeks to solve]

In this conventional technology, when forcibly cooling a group of semiconductor converters that are connected in parallel, the cooling device is composed of a single-eight discharge cooling device that commonly cools the semiconductor converters that are connected in parallel. If the equipment fails, the input power must be disconnected and all semiconductor converters must be stopped to protect the semiconductor converters from overheating, and even if the cooling system fails, the output loss can be reduced. The issue of continuing operation is being discussed, as there is a problem where a single failure of the cooling system would require the entire group of semiconductor converters to be shut down and the power supply to the load side to be stopped. there were.

An object of the present invention is to provide a highly reliable semiconductor conversion device by continuing operation by controlling the output reduction of the semiconductor conversion device even if a single failure occurs in the cooling device.

[Means for solving problems]

In the present invention, a cooling device with a cooling capacity corresponding to each group of parallel semiconductor converters and a gate firing circuit are provided in parallel, and an operation/stop function is established in which the operation/stop conditions of the cooling device are linked to the gate firing circuit. Further, the output current detection circuit of the semiconductor conversion device is provided with a current limiting function under the same operation/stop conditions as described above.

[Operation] When the semiconductor converter group of the parallel configuration of the semiconductor converter is in good condition, the rated output power is supplied to the load side.

When the cooling system of a certain group of semiconductor converters breaks down, the semiconductor converters stop operating at the same time as the operation of the semiconductor converter's gate firing circuit and the gate signal output stop due to the cooling ￥4 Ifft and stop signal, and the cooling system stops operating. Prevent overheating due to shutdown. Further, when a group of semiconductor converters is stopped, the current limiting function of the current detection circuit is activated by a stop signal from the cooling device, and a control operation is performed so as to reduce the output current to the 8th generation of the remaining semiconductor converter group.

As a result, even if a single failure of the cooling device occurs in the semiconductor converter, power supply to the load side can be reliably continued by stopping some of the semiconductor converters and limiting the output current.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a device in which semiconductor converter groups 1-1, 1-2 and 1-3 are configured in parallel to convert AC power into DC power. Each of these semiconductor converters 1-1.1-2.1-3
is a power conversion unit 3-1 that converts AC power into DC power.
3-2.3-3, and a cooling device 2-1.2-2.2-3 that cools these independently. and a gate firing circuit 51.52.5-3 which provides a gate firing control signal to the power conversion unit 3-1.3-2.3-3. Each of the cooling devices 2-1.2-2.2-3 has a cooling fan power switch 4-1.4-2.4-3 for operating and stopping the cooling device.
Power is supplied from each.

Each of the gate firing circuits 5-1.5-2.5-3 receives a control signal from the pulse phase shift circuit 6, performs pulse amplification, and outputs a Goo1- signal. Also, cooling fan power switch 4
- Operate or stop the gate ignition circuit 5-1.5-2.5-3 using the cooling fan operation/stop condition signals 4-1a, 4-2a, 4-3a from 1.4-2.4-3. .

The DC output current of the power converter is detected by a current detection circuit 8, and the detection signal is fed back to a control circuit 7 to control the output current.

This current detection circuit 8 is cooled 'M[1! The current limiting operation is performed by the operation/stop condition signals 41a, 4-2a, and 4-3a of f.

According to this embodiment, during normal operation of the semiconductor power converter, for example, if the cooling bag [2-1 of the power converter 1-1 fails, the cooling fan power switch 4-1 opens and the cooling At the same time as the fan is stopped, the gate ignition circuit 5-1 is stopped by the stop signal 41a, and the operation of the power conversion unit 3-1 is stopped.

Further, the signal 41a activates the 'IT current limiting function of the current detection circuit, and the supply to the load side can be maintained by safe and reliable protection of the semiconductor conversion device and power control.

In this example, the power converter group has an example of a ternary array configuration, but the parallel configuration can be arbitrarily changed depending on the capacity of the devices.

〔Effect of the invention〕

According to the present invention, in each cooling device of a group of semiconductor power converters configured in parallel, even if one or more cooling devices fail, the semiconductor power converter corresponding to the failed cooling device can be reliably replaced. In addition to providing stop protection,
It is possible to control the current to correspond to the output current of the remaining intact semiconductor converter group, thereby maintaining safe operation and power supply to the load side.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a forced air cooling type semiconductor power converter according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional semiconductor power converter. 5-1 to 5-3...Gate firing circuit.

Claims (1)

[Claims] 1. A group of power conversion units made of gate-controlled semiconductor devices arranged in parallel, a cooling device provided corresponding to each power conversion unit, and a gate firing circuit of the power conversion unit. a plurality of parallel power converters consisting of;
In a power conversion device comprising a control circuit for controlling a group of power converters, a pulse phase shift circuit, and a current detection circuit having a current limiting function, each of the cooling devices corresponding to each of the power conversion units A forced cooling semiconductor conversion device, characterized in that a function for operating or stopping the gate ignition circuit of each of the power converters corresponding to the cooling device is provided according to an operation/stop condition signal.