JP2000197369A - Power supply device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device for a vehicle which continues operation judging that a power supply has recovered when an input voltage is normal, even if the waveform of the input voltage is distorted when recovering from a section. SOLUTION: According to a DC voltage obtained by rectification due to a diode rectifying circuit 7 of an input part 3, AC output is obtained by a DC/AC converter 10, and DC output is obtained by a DC/DC converter 9, thus controlling the DC/DC converter 9 and DC/AC converter 10 at a high speed, and stabilizing an output voltage, when a voltage is applied to a section without detecting the section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular power supply for obtaining power from an AC input power supply.

[0002]

2. Description of the Related Art As shown in FIG. 5, a vehicular power supply device that obtains power from an AC input power supply reduces the AC from an AC input power supply 1 with a step-down transformer 2 and supplies the voltage to a thyristor phase control circuit 4 of an input unit 3. The DC voltage is input and rectified and smoothed by the filter capacitor 5 to obtain a DC voltage.

Further, a section detecting device 6 is provided to detect that the vehicle is passing through the section, and the phase control of the thyristor phase control circuit 4 of the input unit 3 is stopped by the section detecting signal S when the vehicle passes through the section. Like that. This is to prevent the output voltage of the filter capacitor 5 from jumping if the thyristor of the thyristor phase control circuit 4 is in a conductive state when the section is restored after passing through the section.

As described above, in the section, the phase control of the input unit 3 is stopped. However, the AC input voltage 1 does not decrease due to the regenerative electric power of the rotating machine connected in parallel to the input unit 3. Therefore, it is difficult to detect the section only by the input voltage drop. Therefore, normally, the section detection device 6 performs section detection under the OR condition of the input voltage drop and the input frequency drop, and detects the section return under the AND condition of the input voltage drop return and the input frequency drop return.

[0005]

However, when the input voltage is recovered but the input voltage waveform is distorted when returning from the section for some reason, the frequency drop detection may remain active. As a result, detection of section return is delayed. If the section return detection is delayed, the stop mode is determined, and the vehicle power supply device remains stopped.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply device for a vehicle which continues to operate when the input voltage is normal even if the input voltage waveform is distorted at the time of returning from the section.

[0007]

According to a first aspect of the present invention, there is provided a vehicle power supply device for an AC input vehicle, wherein the AC input power is rectified by a diode rectifier circuit, smoothed by a filter capacitor, and the DC voltage is reduced. And a DC / DC converter for obtaining a DC output from the DC voltage obtained by the input unit and an AC output from a DC / AC inverter.

In the power supply device for a vehicle according to the present invention, an AC output is obtained by a DC / AC inverter from a DC voltage obtained by rectification by a diode rectifier circuit of an input portion, and a DC output is obtained by a DC / DC converter. Get. Thus, the DC / DC converter and the DC / AC inverter can perform high-speed control, so that the output voltage is stable even during section repressurization. Therefore, the output voltage can be stabilized without performing section detection.

A vehicle power supply device according to a second aspect of the present invention is the AC power supply device for a vehicle, wherein the input unit obtains a DC voltage by rectifying an AC input power supply with a diode rectifier circuit and smoothing the same with a filter capacitor. An output unit for obtaining an AC output or a DC output after the DC voltage obtained by the input unit is reduced by a DC / DC converter.

In the power supply device for a vehicle according to the present invention, the DC voltage obtained by the rectification by the diode rectification circuit of the input portion is stepped down by the DC / DC converter, and then the AC output is obtained by the DC / AC inverter. And DC / D
DC output is obtained by C converter. Thereby, DC / D
Since the C converter and the DC / AC inverter can perform high-speed control, the output voltage is stable even during section repressurization. Therefore, the output voltage can be stabilized without performing section detection.

According to a third aspect of the present invention, in the power supply device for a vehicle according to the first or second aspect of the present invention, the section is detected based on a voltage and a frequency of the AC input power supply and output to the output section. A device is provided.

According to a third aspect of the present invention, in addition to the operation of the first or second aspect of the present invention, when a section is detected by the section detecting device, the section detecting signal is output to an output section. Output to inform section detection and section return.

According to a fourth aspect of the present invention, in the vehicle power supply device according to the third aspect of the present invention, the section detecting device determines the section detection based on either the input voltage drop or the input voltage frequency drop of the AC input power supply. However, the detection of the return from the section is performed only by the recovery of the input voltage.

According to a fourth aspect of the present invention, in addition to the operation of the third aspect, the section detection by the section detection device is performed by either the input voltage drop of the AC input power supply or the input voltage frequency drop. The recovery from the section is detected only by the recovery of the input voltage. Thus, even when the waveform is distorted, section recovery can be performed when the input voltage recovers.

[0015]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a vehicle power supply device according to a first embodiment of the present invention.

The AC from the AC input power supply 1 is input to a diode rectifier circuit 7 of the input unit 3 and rectified by the diode rectifier circuit 7. Then, it is smoothed by the filter capacitor 5 and becomes a DC voltage, which is input to the output unit 8. The output unit 8 obtains a DC output from the DC / DC converter 9 based on the input DC voltage, and outputs the DC / AC
At 0, an AC output is obtained.

Next, the operation will be described. If the train passes through the section, the voltage value of the AC input power supply 1 decreases, but the DC voltage is maintained for a predetermined time by the filter capacitor 5, so that the output unit 8 can continue to output. When the section returns, DC /
The DC converter 9 and the DC / AC inverter 10
High-speed control to keep output voltage constant.

Therefore, it is possible to suppress a jump in the voltage of the filter capacitor 5 when returning from the section, and the output voltage does not greatly jump. Further, since the input unit 3 performs rectification by a diode rectification circuit,
Without depending on the voltage waveform of the input voltage of the AC input power supply 1,
DC voltage can be obtained. This does not affect the output voltage, so that it is not necessary to perform section detection.

In the above description, the output unit 8 converts the DC voltage obtained by the input unit 3 into a DC / DC converter 9.
Although the DC output and the DC output are obtained by the DC / AC inverter 10, the AC output and the DC output may be obtained after the DC voltage obtained by the input unit 3 is reduced by the DC / DC converter.

According to the first embodiment, since it is not necessary to perform section detection, the operation of the apparatus can be continued even if the input voltage is distorted at the time of section return.

Next, a second embodiment of the present invention will be described. FIG. 2 is a configuration diagram of a vehicle power supply device according to a second embodiment of the present invention.

The second embodiment differs from the first embodiment shown in FIG. 1 in that a section detecting device 6 is provided.
The section detection signal S is input to the DC / DC converter 9 and the DC / AC inverter 10 of the output unit 8.

If the power input from the overhead line is cut off when passing through the section, the converter-side output is stopped, and the inverter-side output is connected between the sections so as to continuously operate to supply power to the load. Sometimes you need to detect it. In this case, the section detection device 6 performs the instantaneous stop detection by using both the input voltage drop and the input voltage frequency drop, and detects the return from the instantaneous stop using only the input voltage.

FIG. 3 is a block diagram of the section detecting device 6 according to the second embodiment of the present invention. The input voltage V of the AC input power supply 1 is input to the section detection device 6, and the input voltage drop detector 11 detects a drop in the input voltage V. On the other hand, the frequency drop detector 12 detects a frequency drop of the input voltage V.

When one of the input voltage drop detection signal V1 from the input voltage drop detection section 11 and the frequency drop detection signal f1 from the frequency drop detector 12 is input, the section detection section 13 outputs the section detection signal S Is output, and when the input voltage drop detection signal V1 from the input voltage drop detection unit 11 is restored, the output of the section detection signal S is restored.

FIG. 4 is an operation characteristic diagram of the section detecting device 6 according to the second embodiment. Now, assuming that the frequency drop detection signal f1 is established (turned on) at time t1,
The section detection signal S turns on. Then, assuming that the input voltage drop signal V1 is established (turned on) at the time t2, the section detection signal S has already been turned on, so the section detection signal S continues to be turned on. If the input voltage drop detection signal V1 is not established (off) at time 3, the section detection signal S is not established (off) even if the frequency drop detection signal f1 is established.

As described above, the section detection device 6 outputs the section detection signal S according to the OR condition of the input voltage drop detection signal V1 and the frequency drop detection signal f1. That is, the section entry can be reliably detected by using both the input voltage drop and the frequency drop. On the other hand, when returning from the section, the input voltage drop detection signal V1 detected during the section
Is detected only when disappears. That is, since only the return of the input voltage V is a condition, even if the input voltage V is distorted at the time of section return, the operation of the vehicle power supply device can be continued if the input voltage V returns.

Therefore, when it is necessary to reliably stop the vehicle power supply device in the section, the vehicle power supply device can be reliably stopped in the section. Further, when returning from the section, the operation can be continued even if the input voltage waveform is distorted.

[0029]

As described above, according to the present invention, even if the input voltage waveform is distorted when returning from the section,
The return of the power supply is detected, and the operation of the vehicle power supply device can be continued.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle power supply device according to a first embodiment of the present invention.

FIG. 1 is a configuration diagram of a vehicle power supply device according to a first embodiment of the present invention.

FIG. 3 is a block diagram of a section detecting device according to a second embodiment of the present invention.

FIG. 4 is an operation characteristic diagram of a section detection device according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional vehicle power supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC input power supply 2 Step-down transformer 3 Input part 4 Thyristor phase control circuit 5 Filter capacitor 6 Section detection device 7 Diode rectification circuit 8 Output part 9 DC / DC converter 10 DC / AC inverter 11 Input voltage drop detector 12 Frequency drop detector 13 Section detector

Continued on the front page F-term (reference) 5H007 AA04 AA06 AA17 BB06 CC01 CC03 DB01 DC05 FA02 FA12 5H115 PA08 PI02 PV03 PV09 TO13 TR15 TU06 5H730 AA11 AA12 AA17 AA20 AS13 CC01 FD11 XX02 XX13 XX22 XX33 5H740 BB01 BC MM01

Claims (4)

[Claims] 1. An AC input vehicle power supply device, comprising: an input section for rectifying an AC input power supply with a diode rectifier circuit and smoothing the AC input power supply with a filter capacitor to obtain a DC voltage; An output unit for obtaining a DC output by a DC converter and obtaining an AC output by a DC / AC inverter. 2. An AC-input vehicle power supply, comprising: an input unit for obtaining a DC voltage by rectifying an AC input power supply with a diode rectifier circuit and smoothing with a filter capacitor, and converting the DC voltage obtained by the input unit into a DC / DC voltage. An output unit for obtaining an AC output or a DC output after stepping down by a DC converter. 3. The vehicle power supply according to claim 1, further comprising a section detection device that performs section detection based on a voltage and a frequency of the AC input power supply and outputs the detected section to the output unit. apparatus. 4. The section detection device according to claim 1, wherein the section detection is determined based on either a drop in the input voltage or a drop in the input voltage frequency of the AC input power supply, and the return from the section is detected only by recovering the input voltage. The vehicle power supply device according to claim 3.