JP2533646B2 - Semiconductor aging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an inverter for converting direct current output from a converter into alternating current, which includes a plurality of power semiconductor elements, and is actually used for these semiconductor elements. The present invention relates to a semiconductor aging device for aging by passing a current similar to that at the time.

[Conventional technology]

2. Description of the Related Art In recent years, for example, an inverter having a configuration in which power semiconductor elements such as power transistors and GTOs are connected by Graet's is widely used as a drive device of an electric motor. in this case,
The alternating current obtained from the three-phase alternating current power supply is converted into direct current by the converter, this direct current is supplied to the inverter, and the semiconductor elements for power are turned on and off to supply the variable voltage and variable frequency alternating current to the electric motor. .

By the way, in this type of inverter, in order to ensure quality, that is, in order to reduce initial defects, aging is performed to stabilize the quality before shipment. In this aging, it is desirable to apply the same load to the semiconductor element as in actual use.

FIG. 2 is a block diagram showing a semiconductor aging device of this type together with an application target. In the figure, the AC power supply (1) is connected via an electromagnetic contactor (2) to the input end of a converter (3) formed by connecting a plurality of diodes in a bridge. The smoothing capacitor (4) is connected to the output end of the converter (3), and the input end of an inverter (5) using a power transistor is connected to the output end. A reactor (6) as a load is connected to the output terminal of the inverter (5). Further, a current command generator (7) for commanding an alternating current to be passed through the element to be aged is provided, and the current command and
The current detection value of the reactor (6) detected by the current transformer (10) is added to the voltage command generator (8).

The voltage command generator (8) generates a voltage command that makes the deviation between the current command and the detected current value zero. Also,
In accordance with this voltage command, the PWM control device (9) controls the power transistor forming the inverter (5) to be turned on and off.

 Next, a schematic operation when performing aging will be described.

The capacitor (4) is charged to a voltage corresponding to the value obtained by rectifying the AC power source (1) by a charging circuit (not shown).
In this state, the electromagnetic contactor (2) is closed and the current command generator (7) generates a current command. The voltage command generator (8) generates a voltage command corresponding to this current command and gives it to the PWM controller (9). The PWM control device (9) controls ON / OFF of the semiconductor element forming the inverter (5) according to the voltage command. When an alternating current flows through the reactor (6) in this way, the voltage command generator (8) reduces the difference between the current command and the two-phase current detection value detected by the current transformer (10) to zero. Such a voltage command is generated and added to the PWM control device (9).

In this case, the current command generator (7) generates a current command corresponding to the rated current of the semiconductor element.

Then, the aging is completed by opening the electromagnetic contactor (2) when a predetermined time has passed while the rated current is still flowing.

[Problems to be Solved by the Invention]

The power converter described above, that is, the converter (3)
Also, the inverter (5) is often quite large in capacity, and as a semiconductor element forming the inverter (5),
A rated current of 100 [A] to several 100 [A] is used. In aging, an AC power source (1) having a very large capacity is required to pass such a current.

In a normal factory, such a power supply facility is not prepared, and therefore, there is a problem that aging cannot be performed at a rated current, and insufficient aging can be performed at a considerably smaller current.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a semiconductor aging device capable of passing the same current as in actual use even without a large capacity power supply facility.

[Means for solving the problem]

In the semiconductor aging device according to the present invention, the primary side is connected to the output end of the inverter, the secondary side is an insulating transformer connected to the input end of the converter, and a phase detection for detecting the phase of each phase voltage of the AC power supply. Means, a current detection means for detecting an output current of the inverter, an output current of the inverter based on the phase of the phase voltage and an output of the current detection means, a current signal id of each of a magnetic flux component current and a torque component current. , iq, a current command generating means for generating a magnetic flux component current command signal id ^* and a torque component current command signal iq ^* , the current signals id, iq and the current command signals id ^* , iq ^* a voltage command so that the deviation to zero between a voltage command generating means for generating to said inverter, and configured to on-off control the semiconductor device in accordance with the voltage command Than it is.

[Action]

In the present invention, since the current flowing through the load is returned to the AC power supply side, it is possible to flow the same current as in actual use even without large-capacity power supply equipment.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 denote the same elements. And (11) other than these are step-up transformers (12) whose primary side is connected to the output terminal of the inverter (5) and whose secondary side is connected to the input terminal of the converter (3) via the reactor (6). Is a phase detector that detects the phase of each phase voltage of the AC power supply (1), and (13) is an inverter based on the phase detection value of the phase detector (12) and the current detection value of the current transformer (10). Conversion for converting the output current detection value of 5 into a current signal of two components on two orthogonal axes by a DC value, that is, a magnetic flux component current signal id and a torque component current signal iq (hereinafter, referred to as current id, iq) The device (14) is a current command signal of two components depending on the DC value of DC, that is, a magnetic flux component current command signal id ^* , a torque component current command signal iq ^* (hereinafter referred to as current command signals id ^* , iq ^* . ) Is generated by the current command generator, and (15) is the current signal id, i of the converter (13). q is compared with the current command signals id ^* , iq ^{* of the} current command generator (14), and a three-phase AC voltage command that makes the deviation zero is detected by the phase detector (12). It is a voltage command generator that outputs in synchronization with.

The operation of the present embodiment configured as above will be described below.

First, the capacitor (4) is charged to a voltage corresponding to the maximum value of the AC power source (1) by a charging circuit (not shown). In this state, the electromagnetic contactor (2) is closed and at the same time, the current command generator (14) generates the current command signals id ^* , iq ^* . At this time, the converter (13) has a phase detector (1
The following calculation is performed on the phase θ of the phase voltage from 2) to convert it into DC current signals id, iq.

Where i _U and i _V are U phases detected by the current transformer (10),
This is the V-phase inverter current.

Next, in the voltage command generator (15), the current command signals id *, iq * of the current command generator (14) and the current signal id, iq of the converter (13) are compared, and based on the following formula: Generates a voltage command synchronized with the power supply.

^{_{Here, V d * = G d (}} s) (i d * -i d) V q * = G q (s) (i q * -i q) G d (s), G q (s): d It is the current control system error amplification gain of the axis and q axis.

Next, the PWM control device (9) uses this voltage command V _U ^* , V _V ^* , V
Generates on / off commands for the element to be aged by _W ^* . As a result, a current according to the current command flows through the inverter (5), and at the same time, its output voltage is synchronized with the AC power supply (1). Also, the reactor (6)
The current flowing through is returned to the AC power supply (1) side.

Thus, according to this embodiment, the step-up transformer (11)
Since the current returned through the inverter flows into the inverter (5), the current from the AC power supply (1) can be suppressed to a very low level.

Although the reactor (6) is provided as a load in the above-mentioned embodiment, if the booster transformer (11) having a large capacity is used, the reactor (6) is removed,
Even if the step-up transformer (11) is also used as a load, the current from the AC power supply (1) can be suppressed to a very low level as described above.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the output current phase of the inverter is matched with the power supply phase, and the current is returned to the AC power supply side via the step-up transformer. Even if there is no power supply equipment, there is an effect that the same current as that in actual use can be applied to the semiconductor element forming the inverter.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional semiconductor aging apparatus. (1) …… AC power supply, (2) …… Magnetic contactor, (3) …… Converter, (4) …… Capacitor, (5) …… Inverter, (6) …… Reactor, (9) …… PWM controller, (10) …… Current transformer, (11) …… Boosting transformer, (12) …… Phase detector, (13) …… Converter, (14) …… Current command generator, (15) ) ... Voltage command generator. In each drawing, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. An inverter for converting a direct current output from a converter into an alternating current includes a plurality of power semiconductor elements, and an AC power source is connected to the converter for aging these semiconductor elements, and In a semiconductor aging device for controlling on / off of a semiconductor element, a primary side is connected to an output end of the inverter, a secondary side is connected to an input end of the converter, and an insulating transformer connected to an input end of the converter, and the phase of each phase voltage of the AC power supply is changed. Phase detection means for detecting, current detection means for detecting output current of the inverter, output current of the inverter based on the phase of the phase voltage and output of the current detection means, a magnetic flux component current and a torque component current, respectively. conversion means for converting the current signal id, the iq, to generate a magnetic flux component current command signal id ^* and the torque component current command signal iq ^* It includes a current command generating means, each current signal id, iq and the respective current signal id ^*, and a voltage command generating means for generating a voltage command to said inverter to a deviation zero and iq ^*, the voltage A semiconductor aging device, characterized in that the semiconductor element is controlled to be turned on and off according to a command.