JP4202329B2 - Motor drive device - Google Patents

Description

The present invention relates to a motor drive device with a boosting function for automobiles used in motor drive devices such as HEV (hybrid car), EPS (Electric Power Steering), etc., and more particularly to the configuration of the power supply and the buck-boost converter.

  A conventional motor drive device is composed of a battery, a step-up / step-down chopper circuit, and an inverter. When the motor is driven, the battery voltage is boosted to supply power between the inverters PN, and during power regeneration, the power generated between the inverters PN is generated. The voltage was stepped down to supply power to the battery. On the other hand, the power semiconductor element constituting the inverter and the power semiconductor element constituting the step-up / step-down chopper circuit are configured to be mounted in the same package. (For example, refer to Patent Documents 1 and 2).

JP-A-8-214592 (paragraphs 0038 to 0040, 0043 to 0052, FIGS. 1 to 5) JP 2004-64934 A (paragraphs 0041 to 0043, FIGS. 7 and 8)

  The conventional motor drive device with a boosting function has an electric circuit configuration as described in FIG. 1 of Patent Document 1 and FIG. 8 of Patent Document 2, and as described in FIG. 7 of Patent Document 2. The inverter and the buck-boost converter are in the form of an integral configuration.

  In the motor drive apparatus of a hybrid vehicle, since there are more electromagnetic noise radiations or wirings than three DC lines, the inverter is arranged near the motor, and the battery is a large part because the battery is a large part. It is often arranged at the bottom of the vehicle body or the back of the rear seat.

  In the case of the motor drive device as in the conventional example, the wiring cable between the battery and the buck-boost converter is long. Further, the current between the battery and the step-up / down converter is larger than that of the current between the step-up / step-down converter and the inverter, and a large current wiring cable has to be routed in the automobile.

  Cables for carrying large currents must be thicker in diameter in order to keep power loss due to resistance and heat generation caused by resistance to within the allowable value, increasing the wiring cable space and the weight of the wiring cable. There was a problem that became larger.

  The present invention has been made to solve the above problems, and can reduce the cost, weight, and space of the wiring cable, and can efficiently cool the energy storage source and the converter circuit. Accordingly, an object of the present invention is to provide a motor drive device that can reduce the size of a converter circuit and increase the efficiency of a power supply module.

  It is another object of the present invention to provide a motor drive device that can reduce power loss and heat generation of a power supply module and that does not impair cooling performance by appropriately arranging a wiring bus bar between terminals.

The motor drive device according to the present invention converts an energy storage source, a DC-DC conversion converter circuit for controlling a DC voltage of the energy storage source, and a DC output of the DC-DC conversion converter circuit into an alternating current. In the motor drive device having an inverter circuit to be applied to the motor, the energy storage source and the DC-DC conversion converter circuit are formed as an integrated power supply module having an integrated structure , and the integrated power supply module is the DC- A DC conversion converter circuit is mounted on a cooling block having a plurality of fins, and the energy storage source configured by arranging a plurality of energy storage cells in parallel includes the cooling block of the DC-DC conversion converter circuit and the above It is provided so as to face each other through the fins, and the cooling block and the energy storage source In is obtained by so feeding the cooling air to the air passage formed by the fin.

  Since the motor drive device according to the present invention is configured as described above, and the battery and the buck-boost converter are integrated, the large current wiring between the battery and the buck-boost converter is shortened, and between the buck-boost converter and the inverter. The wiring of the current (current between the battery and the buck-boost converter / boost ratio) is longer and the wiring cable routed around the car is thinner and lighter than the conventional device, so the wiring cable is low. Cost reduction, space saving, and weight reduction are possible.

Also, a bar Tteriseru and down converter unit arranged so as to face through the fins, with feeding the cooling air in the wind path formed by the fins between the battery cell and the step-up and step-down converter unit, battery Because the terminal surface of the cell and the terminal surface of the buck-boost converter unit are provided on the same side on one side of the cooling block , the battery and the buck-boost converter constitute a body-type variable voltage power supply module. The wiring within the voltage variable power supply module can be minimized, and the above-mentioned wiring can cool the buck-boost converter by effectively using the cooling air for the battery cell without impairing the cooling of the battery cell. It will be.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a schematic configuration of the motor driving apparatus according to the first embodiment. As shown in the figure, the variable voltage power supply module 1, the inverter 7, the smoothing capacitor 6 disposed between the DC voltage terminals (P terminal and N terminal) of the inverter 7 and the axle of the automobile are coupled. An electric motor 8 is included.

  The variable voltage power supply module 1 includes a battery 2 as an energy storage source and a step-up / down converter 3 for DC-DC conversion. The step-up / down converter 3 includes a smoothing capacitor Cin on the battery side, a smoothing capacitor Cout on the inverter side, a choke coil L, a power semiconductor module 4 in which two elements are packaged in one package, and a control signal for controlling each element of the semiconductor module. It is comprised by the control circuit 5 which forms.

  Next, connection of the step-up / down converter 3 will be described. The power semiconductor module 4 has a configuration in which two sets of parallel bodies of a semiconductor element IGBT (Insulated Gate Bipolar Transistor) and a diode are connected in series. The cathode of the diode is connected to the collector of the IGBT, and the anode of the diode is connected to the emitter of the IGBT to form a parallel body. In FIG. Are connected to form two sets of serial bodies.

  The connection point of the upper and lower IGBTs is connected to one terminal of the choke coil L, the collector terminal of the upper IGBT is connected to one terminal of the smoothing capacitor Cout and the P terminal of the voltage variable power supply module 1, The emitter of the side IGBT is connected to the other terminal of the smoothing capacitor Cout, one terminal of Cin, and the N terminal of the voltage variable power supply module 1. The other terminal of the choke coil L is connected to the other terminal of the smoothing capacitor Cin and the VB terminal of the voltage variable power supply module 1.

  Since the configuration of the inverter 7 and the operation of the inverter 7 and the step-up / down converter 3 are described in detail in Patent Documents 1 and 2, description thereof is omitted here.

Next, the structure of the step-up / down converter 3 will be described based on a schematic perspective view shown in FIG.
The electric component which comprises the buck-boost converter 3 is mounted in the side in which the fin of the thermal radiation fin 10 is not formed. The power semiconductor module 4 and the choke coil L, which are components that need to be actively cooled among the electrical components, are disposed on the radiation fin 10 and fixed to the radiation fin. The smoothing capacitors Cin and Cout are fixed on a substrate 20 (hereinafter referred to as a smoothing capacitor substrate) on which pattern wiring is formed by soldering or the like, disposed on the power semiconductor module 4, and fixed by a fixing jig (not shown). ing.

  The collector terminal of the upper IGBT and the emitter terminal of the lower IGBT of the power semiconductor module 4 are connected to both terminals of the smoothing capacitor Cout on the smoothing capacitor substrate 20 by using a fixing jig (not shown). The P terminal and N terminal for external wiring connection are also connected to both terminals of Cout through the pattern wiring of the smoothing capacitor substrate 20 using a fixing jig.

  The remaining terminals of the power semiconductor module 4 (terminals of connection points of the two IGBTs) are connected to one terminal of the choke coil L by the bus bar wiring 15, and the other terminal of the choke coil L is connected to the smoothing capacitor substrate 20. The smoothing capacitor Cin is connected to the terminal on the VB terminal side through the patterned wiring.

The VB terminal for external wiring connection is connected to the Cin terminal of the smoothing capacitor substrate 20 using a fixing jig. The control circuit 5 is fixed in a state where the substrate that forms the control circuit 5 stands, and is connected to the signal line of the power semiconductor module 4 by soldering or the like. Although not shown, a drive voltage cable and a control signal cable are connected to the substrate of the control circuit 5 from the outside.
The lid 11 is disposed so as to cover each electrical component, and is fixed to the heat radiation fin 10.

  FIG. 3 shows the overall structure of the voltage variable power supply module 1. The variable voltage power supply module 1 is configured to take in cooling air from the outside as indicated by an arrow A and to send the cooled air to the outside from the rear in FIG. Further, the step-up / step-down converter unit 3 described with reference to FIG. 2 is arranged in parallel with the battery cell group 2 formed of a series body of a plurality of battery cells so that the cooling air intake directions are both indicated by arrows A. Is arranged.

  Further, the upper surfaces of the P terminal and N terminal, which are connection terminals of the step-up / down converter unit 3, and the normal directions of the positive and negative electrode terminals 2A and 2B of the battery cell are made to coincide with each other. In addition, the normal directions of the terminals 2A, 2B, P terminal, and N terminal surfaces of the two terminals are at an angle of approximately 90 degrees with the direction of the cooling air indicated by the arrow A.

  The battery cell group 2 and the step-up / step-down converter unit 3 are arranged in a parallel relationship so that the cooling air intake directions coincide with each other. It can be shared for both cooling. In addition, by matching the normal direction of the electrode terminal surface of the battery cell group 2 and the connection terminal surface of the buck-boost converter unit, it becomes possible to make the bus bar of a large current the shortest, and the power loss and heat generated by the bus bar. Can be suppressed.

  In addition, the normal direction of the battery electrode terminals and the terminal surface of the buck-boost converter unit is at an angle of approximately 90 degrees with the direction of the cooling air, so that the wiring bus bar between the terminals is arranged in the path of the cooling air The cooling performance is not impaired.

It is a circuit diagram which shows schematic structure of the motor drive device by Embodiment 1 of this invention. 1 is a schematic perspective view showing a configuration of a buck-boost converter that constitutes a voltage variable power supply module in Embodiment 1. FIG. 1 is a schematic perspective view showing a configuration of a voltage variable power supply module according to Embodiment 1. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Voltage variable power supply module, 2 Battery, 3 Buck-boost converter, 4 Power semiconductor module, 5 Control circuit, 6 Smoothing capacitor, 7 Inverter, 8 Electric motor, Cin Battery side smoothing capacitor, Cout Inverter side smoothing capacitor, L cho Kukoil.

Claims (3)

An energy storage source; a DC-DC conversion converter circuit that controls a DC voltage of the energy storage source; and an inverter circuit that converts a DC output of the DC-DC conversion converter circuit into an alternating current and applies it to a motor. In the motor drive device, the energy storage source and the DC-DC conversion converter circuit are formed as an integral power supply module having an integrated structure , and the integrated power supply module includes a plurality of DC-DC conversion converter circuits. The energy storage source, which is mounted on a cooling block having fins and is configured by arranging a plurality of energy storage cells in parallel, is provided to face the cooling block of the converter circuit for DC-DC conversion via the fins. And formed by the fins between the cooling block and the energy storage source. Motor driving apparatus being characterized in that so as to feed cooling air to the road. The integrated power supply module is provided with a connection terminal to the outside of the DC-DC conversion converter circuit so as to be positioned on the outer peripheral surface of the fin on one side of the cooling block, and positive and negative electrode terminals of the energy storage source The motor drive device according to claim 1, wherein the motor drive device is provided so as to be flush with the connection terminal and is connected to the connection terminal by a bus bar wiring . In the integrated power module, the direction in which cooling air is fed into the fins of the cooling block of the converter circuit for DC-DC conversion and the extension direction of the bus bar wiring form an angle of approximately 90 degrees. The motor driving device according to claim 2, wherein

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