JPH04200201A - Auxiliary power supply for dc electric vehicle - Google Patents

Abstract

PURPOSE:To realize reduction of the size, the weight and the cost of an auxilia ry power supply by obtaining the auxiliary power supply for a vehicle from the input side of series connected unit inverters in a voltage type VVVF inverter for driving the vehicle through another inverter. CONSTITUTION:Insulating transformers for half-bridge inverters 11-14 are connected in series on the secondary thereof and provide an input to a diode rectifier 15. Output of the diode rectifier 15 is connected through an output filter capacitor 16 with DC output terminals P, N. Consequently, input circuits of inverters 31-34 for driving a vehicle and input filter capacitors 312-342 in the inverters 31-34 can also be used for an auxiliary power supply 50 for the vehicle and thereby the size, the weight and the cost can be reduced. Furthermore, since the input current to each half-bridge inverter is identical, input powers are balanced and voltage imbalance does not occur in the input filter capacitor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an auxiliary power supply device for a DC electric vehicle driven by a voltage type VVVF (variable voltage variable frequency) inverter.

[Prior Art] The applicant has proposed a DC electric vehicle system driven by a voltage source inverter whose DC input side is connected in series.

FIG. 7 is a schematic diagram showing such a system.

In the figure, 1 is a pantograph, and 2 is an inverter input circuit, which includes, for example, a high-speed circuit breaker 21, switches 22 and 23, a charging resistor 24 for an inverter input capacitor, and a reactor 25.

31 to 34 are voltage type inverter units, and 41 to 44 are vehicle drive electric motors. 5 is a vehicle auxiliary power supply device, 6
is an input circuit for auxiliary power supply, and is often configured similarly to input circuit 2.

FIG. 8 shows details of the inverter unit 31,
311 is a voltage source transistor inverter, 312 is an input filter capacitor, and shows an example in which two sets are connected in series. 313 is a resistor, and 314 is a semiconductor (transistor) chopper.

FIG. 9 shows details of the auxiliary power supply device 5, and shows an example of a DC-DC converter type.

In the same figure, 510 and 511 are semiconductor switches (GT
thyristor), 520 and 521 are input filter capacitors of the DC-DC converter, and here two sets are connected in series. 530 is an isolation transformer, 540 is a diode rectifier, 550 is an output filter capacitor, and rectifier 54
Smooth the DC output from 0. The primary side of the isolation transformer 530 is connected to the midpoint of a series circuit of semiconductor switches 510 and 511 and the midpoint of a series circuit of input filter capacitors 520 and 521, and a diode rectifier 5 is connected to the secondary side of the isolation transformer 530.
Connect 40.

That is, the DC-DC converter system shown in the figure uses a half-bridge inverter consisting of semiconductor switches 510 and 511 to simplify the configuration, and after converting direct current to alternating current, it is converted to alternating current by a rectifier 540 via an isolation transformer 530. This is an example of a power supply device that converts alternating current into direct current and outputs direct current.

- For boat fishing, various auxiliary equipment for vehicles such as a CVCF (constant frequency constant voltage) inverter and cooler are connected to this DC power source. Note that illustration of auxiliary equipment is omitted.

[Question H that the invention seeks to solve] As mentioned above, in a DC electric vehicle, the vehicle drive electric power is used to drive the vehicle! (in the above example, the voltage source inverter), as well as coolers, lighting equipment, and compressors.

Power supplies are required for various types of auxiliary equipment such as passenger service equipment.

Conventionally, this power source is also obtained directly from high-voltage overhead contact lines, so an input circuit and a DC-DC converter are required, and these input sections are required to be high-voltage devices. A vehicle auxiliary power supply has a smaller capacity than a vehicle drive power supply, but since conventional systems use many high-voltage devices, the problem is that the auxiliary power supply is large, heavy, and therefore expensive.

Therefore, an object of the present invention is to reduce the size, weight, and cost of an auxiliary power supply device for a vehicle.

[Means to solve the problem]

A plurality of voltage type unit inverters are connected in series on each DC input side to collect current from a DC overhead contact line and drive a motor for driving an electric car, and an inverter unit for vehicle auxiliary power source is connected on the DC input side of each unit inverter. Connect to obtain auxiliary power for the vehicle.

C Effect] By using the input circuit of the vehicle drive inverter and the input filter capacitor in the inverter also for the vehicle auxiliary power supply, it is possible to reduce the size, weight, and cost.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention, in which the same parts as in FIG. 7 are denoted by the same numbers, and are an example of a DC-DC converter system.

In the same figure, 50 is a DC-DC converter, and 11
-14 are half-bridge inverters, and switching elements 111 and 112 are the same power transistors as inverter units 31-34. 113 is an isolation transformer of the half-bridge inverter 11, and the input filter capacitor 312 of the inverter unit 31 is commonly used as the input filter capacitor of the half-bridge inverter 11. Note that the same applies to the other half-bridge inverters 12 to 14, so a description thereof will be omitted.

The secondary sides of the isolation transformers of the half-bridge inverters 11 to 14 are connected in series, respectively, and power is supplied to the diode rectifier 15. Its output is connected to DC output terminals P and H via an output filter capacitor 16.

In this way, the input circuits of the vehicle drive inverters 31 to 34 (see reference numeral 2 in FIG. 7) and the input filter capacitors 312 to 342 in the inverters 31 to 34 are also used for the vehicle auxiliary power source 50, resulting in a compact and lightweight design. Furthermore, it becomes possible to reduce the price.

FIG. 2 is a block diagram showing another embodiment of the DC-DC converter.

In the figure, 51 is a DC-DC converter, 110 to
140 is a half bridge inverter, 150 is a diode rectifier, 160 is an output filter capacitor, 312 ~
342 is an input filter capacitor. That is, this embodiment differs from that shown in FIG. 1 in that the secondary sides of each isolation transformer are not connected in series, but are individually connected with diode rectifiers. For example, a diode rectifier 150 is connected to the transformer 113, and its DC side is further connected to DC output terminals P and N via a capacitor 160. This is similar to other half-bridge inverters 120-14
The same applies to 0.

In other words, in Figure 1, the secondary windings of each isolation transformer are connected in series, so the input current of each half-bridge inverter is the same and the input power of each is balanced, so the input filter capacitor has a voltage amplifier. Balance does not occur. On the other hand, in the case of Fig. 2, the half-bridge inverter is equivalently connected in parallel to the DC output terminals P and N, so if each inverter is controlled so that the input power is the same, the As in the example shown in Figure 1, no voltage imbalance occurs in the input filter capacitor.

FIG. 3 shows an embodiment in which the output of the vehicle auxiliary power source is AC.

In the same figure, 210 to 240 are CVCs for vehicle auxiliary power supply.
F inverters are connected in parallel to inverter units 31 to 34, respectively. Transformers 114 to 117, which serve as insulation and voltage value adjustment, are connected to the output side, and the secondary sides of the transformers are connected in series to each other and connected to the AC output terminal T, and AC is obtained through this terminal. It is something. In addition, CV
As the CF inverter, for example, one having a configuration as shown in FIG. 4 can be used.

FIG. 5 is a block diagram showing still another embodiment of the DC-DC converter system.

Reference numeral 53 in the figure indicates a DC-DC converter.

As is clear from the same figure, this is exactly the same as that shown in FIG. 3, except that a diode rectifier 155 and a smoothing capacitor 165 are connected to obtain a DC output.

FIG. 6 is a block diagram showing another embodiment corresponding to that shown in FIG. 2. In other words, whereas the one shown in Figure 5 is one in which the secondary windings of the transformer are connected in series, this is an example in which a rectifier is connected individually to the secondary side of the transformer, and it is a full-bridge CVCF inverter. 2 except that half-bridge inverters 210-240 are used in place of half-bridge inverters 110-140, so the explanation will be omitted. In addition, 114-1
17 is a transformer, 151 to 154 are rectifiers, 161 to 16
4 indicates a filter capacitor.

In any of the above embodiments, the auxiliary power inverter has the same potential as the vehicle drive inverter unit, so there is no need to separately provide cooling fins for the semiconductor elements that constitute each inverter. can be shared with each other.

[Effects of the Invention] According to the present invention, the vehicle drive voltage source VV connected in series
Since the vehicle auxiliary power source is obtained from the input side of each unit inverter of the VF inverter via a separate inverter, it is possible to omit: i) an input circuit and an input filter capacitor for the vehicle auxiliary power supply device;

ii) The semiconductor switch of the auxiliary power inverter is VVV.
Since each unit of the F inverter has the same potential as the semiconductor switch of the inverter, the cooling fins can be shared.

Benefits such as: As a result, many parts for the auxiliary power source can be used in common with the vehicle drive VVVF inverter, making it possible to make the auxiliary power source smaller, lighter, and lower in price.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a first embodiment of the present invention, Fig. 2 is a block diagram showing a second embodiment of the present invention, and Fig. 3 is a block diagram showing a third embodiment of the present invention. , FIG. 4 is a circuit diagram showing a specific example of the CVCF inverter used in FIG. 3, FIG. 5 is a block diagram showing a fourth embodiment of the present invention, and FIG. 6 is a fifth embodiment of the present invention. Figure 7 is a schematic diagram showing the proposed system, Figure 8 is a detailed diagram of the inverter unit used in Figure 7, and Figure 9 is a detailed diagram of the auxiliary power supply device used in Figure 7. be. Code explanation 1...Pantograph, 2.6...Input circuit, 5,5
0-54...Vehicle auxiliary power supply device, 11-14, 11
0~140... Half bridge inverter, 15°150~155,540... Rectifier, 16,160~
165,550...output filter capacitor, 21.
...breaker, 22.23 ... switch, 24,313
...Resistor, 25...Reactor, 31-34...
Inverter unit, 41-44... electric motor, 111
゜112.510.511...Semiconductor switch, 11
3~117,530...Transformer, 210~240...
・CVCF inverter, 311...Voltage source transistor inverter, 312-342,520,521...
Input filter capacitor, 314...transistor chopper. Agent Patent Attorney Akio Namiki IWJ Figure 2 N Figure 3 Figure 4 Figure 210 (220-240) Figure 59 Figure 16 N 1 to 7 Figure 8

Claims (1)

[Scope of Claims] 1) A plurality of voltage unit inverters that collect current from a DC overhead contact line and drive a motor for driving an electric car are connected in series at each DC input side thereof, and the DC input side of each unit inverter is connected in series. An auxiliary power supply device for a DC electric vehicle, characterized in that an auxiliary power source for the vehicle is obtained by connecting an inverter unit for the auxiliary power source of the vehicle to the auxiliary power source for the vehicle. 2) The auxiliary power supply device for a DC electric vehicle according to claim 1, characterized in that cooling fins for semiconductor elements of the vehicle drive unit inverter and the vehicle auxiliary power supply inverter unit share cooling fins for each semiconductor element.