JPH10290501A - Stationary type auxiliary power supply unit for motor vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the anhysteresis of a transformer by comparing an instantaneous value of the output current of an inverter device to its effective value and, if an anhysteresis current is detected at the positive side, then the output pulse at the positive side is reduced and the output pulse at the negative side is increased thereby correcting an unbalance between the positive and the negative of the inverter device. SOLUTION: An effective value is detected by an effective value detector 16 from a U-phase current 13, V-phase current 14 and W-phase current 15 which were detected by a current detector for detecting the output current of an inverter device. From the U-phase current 13, if a result obtained by subtracting a value obtained by multiplying the effective value by an arbitrary coefficient 17 is positive, then a positive definite value 18 of the anhysteresis current of U-phase is detected; and if a result obtained by adding a U-layer current 13 to an effective value multiplied by an arbitrary coefficient 17 is negative, then a positive definite value 18 of the anhysteresis current of U-phase is detected; if a result obtained by adding a U-layer current 13 to the effective value multiplied by an arbitrary coefficient 17 is negative, a negative value 19 of the anhysteresis current of U-phase is defined as a detected value. If a counter 22 detects a positive definite value 18 of the anhysteresis current of U-phase, then 1 is added, and 1 is subtracted if a negative value 19 of the anhysteresis current of U-phase is detected, and a count value 32 of the anhysteresis current detected of the U-layer is output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stationary auxiliary power supply for a vehicle.

[0002]

2. Description of the Related Art If there is an error in positive and negative control in the hardware and software of an inverter device, the areas of the positive and negative pulses output from the inverter device are different, and the output voltage is unbalanced between positive and negative, and the output voltage is shifted to the output side. The connected transformer is magnetized. There is no control for comparing the instantaneous value and the effective value of the output current of the inverter device, detecting the magnetism of the transformer, correcting the positive / negative imbalance of the output voltage of the inverter device, and correcting the magnetism of the transformer.

[0003]

Conventionally, the output voltage of the inverter device is imbalanced between positive and negative, and the transformer is magnetized.
Even if the magnetizing current flows, there is no control for correcting the positive / negative imbalance of the output voltage of the inverter device, so that the magnetizing of the transformer cannot be corrected.

An object of the present invention is to perform control for correcting a positive / negative imbalance of an output voltage of an inverter device and correcting a magnetic bias of a transformer.

[0005]

Means of the present invention for achieving the above object are as follows.

[0006] The output voltage of the inverter device is imbalanced between positive and negative, the transformer is magnetized, and a magnetized current flows. The instantaneous value and the effective value of the output current of the inverter device are compared to detect the bias current. When the positive side demagnetizing current is detected, the positive side output pulse is reduced and the negative side output pulse is increased. Conversely, when the negative side demagnetizing current is detected, the positive side output pulse is increased and the negative side output pulse is reduced,
The positive and negative imbalance of the output voltage of the inverter device is corrected, and the magnetic bias of the transformer is corrected.

In the present invention, when the output voltage of the inverter device is imbalanced positive and negative and the transformer is demagnetized, the magnetizing current of the transformer is detected and the imbalance of the output voltage of the inverter device is corrected, and To correct the magnetism of the detector.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a stationary auxiliary power supply device for a vehicle according to the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a main circuit diagram of the stationary auxiliary power supply of the present invention. This stationary auxiliary power supply device constitutes an inverter device 24 for converting DC power into AC power, a transformer 25 for transforming the output voltage of the inverter device 24, and a waveform shaping filter for shaping the output voltage into a sine wave. AC reactance 26, AC capacitor 27, and current detectors 29, 30 for detecting the output current of inverter device 24,
31. A load 28 of the vehicle is connected to the output of the stationary auxiliary power supply.

FIG. 2 is a control block diagram for detecting the bias current. Since the sum of the three phases of the three-phase alternating current voltage becomes zero, two phases may be controlled. As an example, description will be made by controlling the U phase and the V phase. The detection of the U-phase bias current will be described. U-phase current 13, V detected by current detectors 29, 30, 31
An execution value is detected by the execution value detector 16 from the phase current 14 and the W-phase current 15.

From the U-phase current 13, an arbitrary coefficient 1
When the value obtained by subtracting the value obtained by multiplying by 7 is positive, the positive value 18 of the U-phase demagnetizing current is detected, and the value obtained by adding the value obtained by multiplying the U-phase current 13 and the effective value by an arbitrary coefficient 17 is negative. At this time, the negative value 19 of the U-phase bias current is detected. The counter 22 adds 1 when detecting the positive value 18 of the U-phase magnetizing current, and subtracts 1 when detecting the negative value 19 of the U-phase magnetizing current, and counts the count value of the U-phase magnetizing current detection. 32 is output.

The detection of the V-phase bias current is performed in the same manner as in the U-phase.
A value obtained by multiplying the phase current 14 and the effective value by an arbitrary coefficient 17 is subtracted and added, and a positive value 20 of the V-phase magnetizing current and a negative value 21 of the V-phase magnetizing current are detected. The counter 23 outputs the count value 33 of the V-phase demagnetizing current similarly to the count 22.

FIG. 1 is a control block diagram for generating positive and negative output pulses of the inverter device according to the present invention. The generation of the U-phase output pulse will be described. The difference between the count value 32 of the U-phase demagnetization current detected by the demagnetization current detection control 1 and the previous value 2 of the count value 32 is obtained, and the modulation wave obtained from the inverter frequency 4 and the modulation factor 5 controlled by other control elements. The zero point 6 is moved in the positive direction or the negative direction, and compared with the positive triangular wave 7 and the negative triangular wave 8, a positive pulse 9 and a negative pulse 10 are generated. When the difference is zero, the count value 32 and the previous value 2 are the same, so the zero point of the modulated wave does not move. When the difference is positive, the count value 32 is larger than the previous value 2, which means that the positive value of the magnetizing current has been counted. Since the transformer is magnetized to the positive side, the zero point of the modulated wave is negative. Move in the direction.
Conversely, when the difference is negative, the count value 32 is smaller than the previous value 2, which means that the negative value of the magnetizing current has been counted.
Since the transformer is magnetized to the negative side, the zero point of the modulated wave moves in the positive direction. Moving the zero point of the modulated wave in the positive direction increases the positive pulse, and moving the zero point of the modulated wave to the negative side increases the negative pulse, thereby correcting the positive / negative imbalance of the output voltage of the inverter device 27. , It is possible to correct the magnetic bias of the transformer.

As in the case of the U-phase, the V-phase output pulse has a count value 33 of the V-phase magnetizing current and a previous value 3 of the count value 33.
And a V-phase pulse generator 12 similar to the U-phase pulse generator 11 generates V-phase positive / negative pulses.

[0015]

According to the present invention, when the output voltage of the inverter device is positively and negatively unbalanced and the transformer is demagnetized, the magnetizing current of the transformer is detected, and the positive and negative imbalance of the output voltage of the inverter device is detected. Correct and correct the transformer bias.

[Brief description of the drawings]

FIG. 1 is a block diagram of control of positive and negative output pulses of an inverter device.

FIG. 2 is a block diagram of control of a bias current detection.

FIG. 3 is a main circuit diagram of a stationary auxiliary power supply device.

[Explanation of symbols]

Reference numeral 1 denotes a bias current detection control, 2 a previous value of a U-phase bias current count, 3 a previous value of a V phase bias current count, 4 an inverter frequency, 5 modulation rates, 6 modulation waves, and 7 positive triangular waves. , 8
... a negative triangular wave, 9 ... a positive pulse generator, 10 ... a negative pulse generator, 11 ... a U-phase pulse generator, 12 ... a V-phase pulse generator.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiyuki Kushida 4-13-17 Nakagawa, Adachi-ku, Tokyo Inside Hitachi Techno Engineering Co., Ltd.

Claims (2)

[Claims] 1. An inverter device for collecting DC power from an overhead wire and converting the DC power to AC power, a transformer for transforming an output voltage of the inverter device, and a sine wave output voltage of the inverter device. A stationary auxiliary power supply for a vehicle, comprising an AC reactor for shaping the waveform into a wave voltage and an AC capacitor, detecting a demagnetizing current of the transformer generated by a positive / negative imbalance of the output voltage of the inverter device, After the detection, the zero point of the modulation wave of the inverter device is moved in the positive or negative direction by the amount of the demagnetizing current, and the area of the positive pulse output from the inverter device is controlled to be equal to the area of the negative pulse, A stationary auxiliary power supply device for a vehicle, wherein a positive / negative imbalance of an output voltage is corrected, and a magnetic bias of the transformer is corrected. 2. The method according to claim 1, wherein the detection of the demagnetizing current is performed when the instantaneous value of the output current of the inverter device flows in the positive direction several times the effective value of the output current. A stationary auxiliary power supply device for a vehicle which detects a magnetic current and detects a negative-side demagnetizing current when the instantaneous value of the output current of the inverter device flows in the negative direction several times the effective value of the output current.