JP2005065460A - Vehicular dynamotor control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular dynamotor control device that achieves an improvement in inverter efficiency while suppressing switching noise. <P>SOLUTION: When an engine is started, the switching elements of three-phase inverter are driven via gate resistors 53, 58, and at the time of high-speed revolutions, the switching elements are driven via gate resistors 54, 59. The resistance of the gate resistors 53, 58 are set by twice or more larger than that of the gate resistors 54, 59. This constitution makes it possible to prevent a reverse current at the time of high-speed synchronized rectification, while suppressing the switching noise of the three-phase inverter 3 at the time of starting the engine. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicular generator motor controller that controls an AC rotating electric machine driven as a generator motor, and more particularly to a vehicular generator motor controller that performs synchronous rectification control during a power generation operation of the generator motor.

  In a conventional vehicle drive system, an idle stop system system using a generator motor in which an electric operation for starting an engine and a subsequent power generation operation are configured by an AC machine is known. In order to cause the generator motor to perform a power generation operation and an electric operation, an AC / DC conversion circuit that performs an inverter operation and a rectification operation, that is, an inverter with a rectification function, needs to be interposed between the DC power supply and the generator motor.

  This AC / DC converter circuit (also simply referred to as an inverter) includes a rectifying diode connected in a bridge and a semiconductor switching element individually connected in parallel to each diode. In order to reduce the power loss and heat generation of the diode during the rectification operation of the inverter, it is known to perform the operation of intermittently switching the semiconductor switching element, that is, the synchronous rectification operation. Hereinafter, the AC / DC conversion circuit that performs the synchronous rectification operation is also referred to as a synchronous rectification inverter. Patent Document 1 shows an example of this type of synchronous rectification inverter.

In addition, in the idling stop operation of the vehicle, the inverter interrupts a large current for starting the engine at a high speed for frequent engine starting, so that there is a problem that a large switching noise is generated. In order to reduce this switching noise, in a conventional inverter for driving a vehicle engine, a gate voltage (control voltage) is applied to a gate electrode of a semiconductor switching element of the inverter through a gate resistor having a predetermined resistance value. In this way, the switching operation of the semiconductor switching element is slowed down and the motor current waveform becomes dull, so that switching noise generated by switching of the semiconductor switching element can be reduced. Hereinafter, the above-described AC / DC conversion circuit that applies a control voltage to the control electrode of the semiconductor switching element through a resistor is also referred to as an inverter with a gate resistor.
Japanese Patent No. 2995940

  However, when the above-mentioned AC / DC converter circuit with gate resistance is synchronously rectified during power generation operation of the generator motor for idling stop, AC / DC conversion is performed during high-speed power generation operation due to dull gate voltage due to gate resistance. There is a problem that the intermittent operation (synchronous rectification operation) of the semiconductor switching element of the circuit cannot follow the change in the generated voltage, causing a backflow and greatly increasing loss.

  In addition, when an inverter with a gate resistor is used, switching noise can be reduced during large current switching, for example, when the engine is started, but there is also a problem that loss and heat generation of the semiconductor switching element itself increase.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular generator motor control device that realizes improvement in inverter efficiency while reducing switching noise.

  A vehicle generator motor control device (hereinafter also simply referred to as an inverter device) according to each invention described below includes a plurality of diodes that are bridge-connected and perform a rectifying operation, and are individually connected in parallel with each of the diodes. Each of the diodes and a semiconductor switching element integrally formed separately, and is disposed between a DC power source and a generator motor, and rectifies the generated power of the generator motor during a power generation operation of the generator motor, thereby the DC power source. An AC / DC conversion circuit (hereinafter also simply referred to as an inverter) that converts DC power supplied from the DC power source into AC power and supplies the AC to the generator motor during electric operation of the generator motor, and the semiconductor switching A control circuit (hereinafter simply referred to as a control circuit) that applies intermittent control to the semiconductor switching element by applying a control voltage to the control electrode of the element. Both are equipped with a abbreviated) and.

  An inverter device itself composed of this type of inverter and a controller for controlling the inverter is well known, and is generally used as a control device for an AC rotating electrical machine driven by a DC power supply, and detailed description thereof is omitted.

  The apparatus according to claim 1, particularly, wherein the control circuit intermittently controls the semiconductor switching element by applying a control voltage having a predetermined waveform to a control electrode of the semiconductor switching element during the power generation operation, and The AC / DC converter circuit is synchronously rectified, and the synchronous rectification operation is stopped when the rotational speed exceeds a predetermined value during the power generation operation based on the amount of electricity related to the rotational speed of the generator motor.

  That is, according to the present invention, since the synchronous rectification is stopped and the operation is performed only by the diode rectification at the time of high rotation, there is no problem that the current flows backward due to the switching delay of the semiconductor switching element during the high speed power generation operation. In addition, since the state transition waveform from ON to OFF of the semiconductor switching element and the state transition waveform from OFF to ON are not steep, the switching loss at the time of these state transitions and the synchronous rectification stop when the element heat generation is large, These losses and heat generation can be avoided. Further, the control voltage waveform cannot be dulled sufficiently to prevent the occurrence of the backflow described above, and as a result, the problem that the switching noise becomes large at the time of starting the engine can be solved. Eventually, a vehicular generator / motor control apparatus that achieves improved inverter efficiency while reducing switching noise can be realized in a simple manner.

  In the apparatus according to claim 2, in particular, the control circuit has a state transition waveform of a control voltage applied to a control terminal of the semiconductor switching element when the rotational speed is a predetermined value or more based on a physical quantity related to the rotational speed of the generator motor. Is made sharper than the state transition waveform of the control voltage applied to the control terminal of the semiconductor switching element when the rotational speed is not more than a predetermined value. Here, the state transition waveform refers to a transient waveform of the control voltage during the state transition from the on state to the off state of the semiconductor switching element and during the state transition from the off state to the on state. . Preferably, a MOS transistor or IGBT having a gate electrode as a control electrode is employed as the semiconductor switching element.

  In this way, since the rising or falling response of the semiconductor switching element is excellent during high rotation, the loss and heat generation of the semiconductor switching element during these periods can be reduced, and the occurrence of backflow can also be prevented. Furthermore, since the rise of the semiconductor switching element is slow at low speeds, the change in motor current interrupted by this semiconductor switching element becomes slow, so even if this motor current is large, the semiconductor switching element Switching noise generated during intermittent operation can be reduced to an allowable level range.

  In the apparatus according to claim 3, in particular, the control circuit has a state transition waveform of a control voltage applied to a control terminal of the semiconductor switching element during a power generation operation in which the rotation speed is equal to or greater than a predetermined value. Compared to the state transition waveform of the control voltage applied to the control terminal of the semiconductor switching element during the electric operation below the value, it is sharpened.

  In this way, the operation of the semiconductor switching element for synchronous rectification is accelerated at high revolutions, so that loss, heat generation, and backflow due to frequent and slow operation of the semiconductor switching element can be prevented. In addition, during low-speed electric operation where the back electromotive force (speed electromotive voltage) induced in the stator coil of the generator motor is small and a large current is likely to flow from a constant voltage DC power supply, the operation of the semiconductor switching element is slowed down and the semiconductor Since the change of the current that the switching element is intermittent can be slowed down, the switching noise caused by the wiring inductance that increases according to the frequency can be reduced.

  In the device according to claim 4, in particular, the control circuit generates a state transition waveform of a control voltage applied to a control terminal of the semiconductor switching element when the current is a predetermined value or less based on a physical quantity related to the current of the generator motor. The current is sharpened compared to the state transition waveform of the control voltage applied to the control terminal of the semiconductor switching element when the current is equal to or greater than a predetermined value.

  In this way, since the operation of the semiconductor switching element is speeded up when the switching noise power is small and the current is small, the switching noise associated with the magnitude of the current and the rate of change thereof is suppressed below an allowable level, and the semiconductor switching element is suppressed. It is possible to realize a reduction in loss and heat generation and prevention of backflow due to high-speed operation. Further, since the state transition waveform of the semiconductor switching element is blunted when the switching noise power is large, the switching noise power can be suppressed below an allowable level as described above.

  In the apparatus according to claim 5, in particular, the control circuit shows a state transition waveform of a control voltage applied to a control terminal of the semiconductor switching element during a power generation operation when the current is less than a predetermined value, and the current has a predetermined value. Compared to the state transition waveform of the control voltage applied to the control terminal of the semiconductor switching element during the electric operation as described above, it is sharpened.

  In this way, it is possible to reduce the loss and heat generation of the semiconductor switching element when the current is small while suppressing the level of switching noise below a predetermined level.

  7. The apparatus according to claim 6, wherein the control circuit applies a gate voltage as the control voltage to the gate electrode of the semiconductor switching element through a gate resistor having a predetermined resistance value, and switches the resistance value of the gate resistor. As a result, the state transition waveform of the control voltage is sharpened, so that the circuit configuration can be simplified.

  The apparatus according to claim 7, wherein the control circuit applies a gate voltage as the control voltage to the gate electrode of the semiconductor switching element through a gate resistor having a predetermined resistance value, and is connected in parallel with the gate resistor. Since the state transition waveform of the control voltage is sharpened by the conduction of the short-circuit switch, the circuit configuration can be further simplified.

  In the apparatus according to claim 8, particularly, the control circuit drives the semiconductor switching element through a gate resistor having a maximum resistance value when starting the engine of the generator motor connected to the vehicle engine. A large engine starting torque can be realized by energizing a large current while suppressing switching noise below an allowable range, and in other cases, the resistance value of the gate resistor is appropriately reduced to reduce the switching loss and heat generation. Can be realized.

  Preferred embodiments of the present invention will be specifically described by the following examples.

  A first embodiment will be described with reference to FIG. FIG. 1 is a block circuit diagram showing a generator motor control device that drives and controls a generator motor that performs engine start and power generation of an idle stop vehicle.

(overall structure)
1 is a battery, 2 is a smoothing capacitor, 3 is a three-phase inverter (AC / DC converter circuit), 4 is a controller (control circuit), and 5 and 6 are driver circuits.

  The three-phase inverter 3 includes upper arm switches 31 to 33 and lower arm switches 34 to 36 each made of a semiconductor switching element (here, a MOS transistor). The upper arm switch 31 and the lower arm switch 34 are connected in series to constitute an inverter (referred to as a U-phase circuit), and the upper arm switch 32 and the lower arm switch 35 are connected in series to constitute an inverter (referred to as a V-phase circuit). The upper arm switch 33 and the lower arm switch 36 are connected in series to constitute an inverter (referred to as a W-phase circuit). These three inverters are connected in parallel and supplied with power from the battery 1. These three inverters have AC terminals 37 to 39 consisting of connection points between the upper arm element and the lower arm switch, and the AC terminals 37 to 39 are three-phase stator coils of a three-phase AC generator motor (not shown). Individually connected to U-phase, V-phase, and W-phase terminals (not shown).

  Note that the semiconductor switching elements constituting the upper arm switches 31 to 33 and the lower arm switches 34 to 36 are the above-described MOS transistors that show only one phase in FIG. 2, but diodes and others in parallel with each MOS transistor These transistors may be connected in parallel. However, each of the semiconductor switching elements 31 to 36 needs to include at least one MOS transistor. This is because in this embodiment, a MOS transistor having bidirectional conductivity is required to perform synchronous rectification.

  The controller 4 is a circuit for controlling the rotor coil current (field current) of the three-phase inverter 3 and a generator motor (not shown) for motor control constituted by a microcomputer or a hard logic circuit. The controller 4 determines the operation timing of the three-phase inverter 3 based on the operation command from the outside and the state of the engine and the generator, such as the rotation angle, the rotation speed, the current, and the voltage, and determines the average value of the field current. Based on these determinations, the three-phase inverter 3 is controlled to control the field current.

  The driver circuit 5 is a circuit that amplifies a control voltage (gate voltage) applied to each switch of the three-phase inverter 3 by the controller 4 and converts it into a predetermined waveform. An example is shown in FIG.

  The driver circuit 6 is a PWM control circuit for controlling the field current of the three-phase AC generator motor, and the field current is PWM controlled so that an average current corresponding to the field current level determined by the controller 4 is obtained. To do. It is well known to use field current control transistors and flywheel diodes for this type of coil current control. Therefore, in this embodiment, the driver circuit 6 is constituted by this field current control transistor. It is of course possible to arrange the field current control transistor on the lower arm side, omitting the driver circuit 6, and the three-phase AC generator motor as a rotating electric machine having a structure such as a magnet without a field coil. Of course it is good.

(Overall operation)
Since the configuration of the control circuit itself is already known by controlling the field coil generator motor shown in FIG. 1, further explanation is omitted.

  This three-phase AC generator motor is connected to a traveling engine (not shown) mounted on the vehicle, and when the engine is started, DC power is supplied from the battery 1 and a three-phase AC generator motor (not shown). A large current is supplied to the stator coil and an engine (not shown) is started with a large torque. The battery 1 is connected to a smoothing capacitor 2 and a vehicle electric load (not shown).

  When the rotational speed of the generator motor exceeds a predetermined value driven by the started engine, and the generated voltage of the generator motor reaches a level at which battery power can be supplied, the three-phase inverter 3 operates as at least a diode-type three-phase full-wave rectifier, The rectified DC power is sent to the battery 1. In this embodiment, as shown in FIG. 2, a parasitic diode of a MOS transistor is employed as the rectifying diode of the three-phase inverter 3, but an independent diode may be connected in parallel to the MOS transistor.

  The controller 4 determines whether the voltage (referred to as phase voltage) of the AC terminals 37 to 39 of the three-phase inverter 3 is higher than the high-level potential of the battery 1, that is, the potential of the high-potential power supply line 40. The upper arm element is turned on, and whether it is lower than the low level potential of the battery 1, that is, the potential of the low potential power supply line 41, is determined, and the lower arm element having a low phase voltage is turned on to perform synchronous rectification. Thereby, as already known, it is possible to improve the efficiency of the three-phase inverter 3 during power generation.

(Detailed description of driver circuit 5)
Next, an example of the driver circuit 5 that characterizes this embodiment will be described in detail with reference to FIG. However, FIG. 2 illustrates only control of the upper arm element 31 and the lower arm element 34 constituting the U-phase inverter of the three-phase inverter 3.

  In FIG. 2, the signal voltage S1 output from the controller 4 is amplified by a current buffer 51 formed of a CMOS inverter, and then passed through a gate resistance switching circuit 55 including a changeover switch 52 and gate resistors 53 and 54, and the upper arm element 31. The voltage is applied to the gate electrode of the MOS transistor forming

  Similarly, the signal voltage S2 output from the controller 4 is amplified by the current buffer 56 and then the MOS transistor constituting the lower arm element 32 through the gate resistance switching circuit 60 including the changeover switch 57 and the gate resistors 58 and 59. Applied to the gate electrode.

(Engine start control)
Next, switching control at the time of engine start and high-speed synchronous rectification will be described with reference to FIG.

  First, when the engine is started, the controller 4 generates pulse signal voltages (control voltages) S1 and S2 having a predetermined phase angle with respect to the rotor rotation angle in synchronization with the rotor rotation speed of the generator motor as is well known. At this time, the changeover switches 52 and 57 are tilted toward the gate resistors 53 and 58 as shown in FIG. As a result, the pulse signal voltage S1 is blunted by the gate resistor 53 and applied to the gate electrode of the upper arm element 31, and the pulse signal voltage S2 is blunted by the gate resistor 58 and the gate of the lower arm element 34. Applied to the electrode. The gate resistors 53 and 58 are set to a resistance value that is, for example, twice or more that of the gate resistors 54 and 59.

  When starting the engine, a large current needs to flow through the generator motor in order to generate engine starting torque. Conveniently, since the back electromotive force of the generator motor is very small when the engine is started, if the switching elements 31 to 36 of the three-phase inverter 3 are simply switched according to the rotor angular position, the generator motor is supplied from the battery 1 through the three-phase inverter 3. A large current can flow through. However, when such a large current is suddenly interrupted, there arises a problem that a large switching noise voltage is generated due to wiring inductance or the like. The gate resistors 53 and 58 are for solving this problem and blunt the rising and falling waveforms (also referred to as state transition waveforms) of the control pulses output from the current buffers 51 and 56. Is. The gate resistors 53 and 58 and the gate capacities of the upper arm element 31 and the lower arm element 34 which are MOS transistors constitute a low-pass filter.

  That is, by applying a control pulse to the gate electrodes of the switching elements 31 to 36 of the three-phase inverter 3 through the gate resistors 53 and 58 having high resistance values when starting the engine, the switching elements 31 to 36 are turned on and off. State transition between and is delayed. As a result, the high frequency component of the current flowing from the battery 1 to the generator motor through the switching elements 31 to 36 is reduced, and the switching noise can be suppressed within the allowable level range.

(Control during high-speed synchronous rectification)
Next, switching control during high-speed synchronous rectification will be described with reference to FIG.
The rotational speed of the engine and the generator motor connected to the engine during high-speed running is very high. When synchronous rectification is performed under such high-speed rotation, a backflow occurs due to the blunting of the pulse signal voltage caused by the gate resistors 53 and 58 described above.

  Therefore, in this embodiment, when the generator motor or the engine speed exceeds a predetermined threshold during power generation, the changeover switches 52 and 57 are moved to the gate resistors 54 and 59 side. It is obvious that this type of control operation executed by the controller 4 can be realized by detecting and comparing the rotational speed and a physical quantity (for example, generated voltage) linked with the rotational speed, and a specific illustration of the circuit is omitted.

  The gate resistors 54 and 59 have a smaller resistance value than the gate resistors 53 and 58. As a result, when synchronous rectification is performed during high-speed running, the gate voltage waveform applied to the switching elements 31 to 36 is steeper than when the engine is started, and the above-described backflow can be prevented. Further, such a decrease in the dullness of the gate voltage waveform realizes a shortening of the state transition time of the switching elements 31 to 36. Therefore, the loss and heat generation of the switching elements 31 to 36 during the state transition time can be reduced. it can. In FIG. 2, the gate resistance is changed using a changeover switch. However, it is natural that such a changeover switch can be formed into a semiconductor circuit using a multiplexer circuit or the like.

(Modification 1)
The reduction of the gate resistance value by switching the gate resistor is preferably performed even during high-speed electric operation. For this purpose, the gate resistor may be switched at about the idle speed. In this way, loss and heat generation of the three-phase inverter 3 can be reduced when temporary torque assist is required, such as when the vehicle is accelerating or climbing a hill. In this case, since a large current does not flow as when the engine is started, switching noise does not become a problem as when the engine is started.

(Modification 2)
Another embodiment capable of changing the gate resistance will be described with reference to FIGS. FIG. 4 shows a gate resistor r and, for example, a short-circuit switch 7 connected in parallel. The short-circuit switch 7 may be turned off when the engine is started, and the short-circuit switch 7 may be turned on after the engine is started. In FIG. 5, the gate resistor r1 and the short-circuit switch 7 are connected in parallel, and this parallel connection circuit and the gate resistor r2 are connected in series. The short-circuit switch 7 may be turned off when the engine is started, and the short-circuit switch 7 may be turned on after the engine is started.

(Modification 3)
In the above embodiment, the state transition waveform of the gate voltage of the switching elements 31 to 36 which are MOS transistors is changed by changing the resistance value of the gate resistor. Instead, as shown in FIG. 6, the pulse signal waveforms themselves output from the current buffers 51 and 56 may be changed from the conventional pulse waveform a to trapezoidal waveforms b and c or similar waveforms.

(Modification 4)
In the above embodiment, the state transition waveform of the gate voltage of the switching elements 31 to 36 which are MOS transistors is changed by changing the resistance value of the gate resistor. Instead, the state transition waveform can be blunted by connecting a capacitor in parallel with the gate capacitances of the switching elements 31 to 36, and the state transition waveform can be sharpened by not connecting this capacitor.

(Modification 5)
In the above embodiment, the state transition waveform of the gate voltage of the switching elements 31 to 36 which are MOS transistors is changed by changing the resistance value of the gate resistor. Instead, the pulse signal voltage S1 output from the controller 4 can be applied to the gate electrode of the upper arm element 31 through the current buffer 51 capable of changing the output impedance.

  For example, the current buffer 51 receives a pulse signal voltage S1 and operates in parallel synchronization, and outputs a gate voltage to the gate electrode of the upper arm element 31 in parallel. Can be configured. In this case, there may or may not be a gate resistor. When the engine is started, the operation of the second current buffer is stopped, and the gate electrode of the upper arm element 31 is charged or discharged by the first current buffer. As a result, the state transition waveform of the upper arm element 31 when the engine is started becomes dull. Next, at the time of high-speed synchronous rectification, the gate electrode of the upper arm element 31 is driven through both current buffers or through the second current buffer. Thereby, the state transition waveform of the upper arm element 31 can be sharpened during high-speed synchronous rectification. The advantage of this aspect is that no transfer switch is required as in the case of employing a changeover switch or a short-circuit switch.

(Deformation mode 6)
In the above embodiment, the state transition waveform of the gate voltage applied to the switching elements 31 to 36 of the three-phase inverter 3 is changed at the time of engine start and high-speed synchronous rectification.

  In this aspect, the state transition waveform is changed during low-speed and high-current electric operation (including when the engine is started) and during high-speed and high-current electric operation. Therefore, the rotating electrical machine driven by the three-phase inverter 3 does not require a power generation function. For example, even when the vehicle is driven by a fuel cell, a large current flows through the rotating electrical machine when the vehicle starts suddenly, and switching noise increases as described above. Therefore, in such a case, the switching noise can be suppressed to an allowable level by blunting the state transition waveform.

It is a block circuit diagram which shows the generator motor control apparatus of this invention. FIG. 2 is a circuit diagram illustrating an example of a drive circuit in FIG. 1. It is a circuit diagram which shows a deformation | transformation aspect. It is a circuit diagram which shows a deformation | transformation aspect. It is a timing chart which shows a modification.

Explanation of symbols

1 Battery 2 Smoothing capacitor 3 Three-phase inverter (AC / DC converter circuit)
4 Controller (control circuit)
DESCRIPTION OF SYMBOLS 5 Drive circuit 6 Drive circuit 31-36 Three-phase inverter switching element 51, 56 Current buffer 52, 57 Changeover switch 53, 54 Gate resistor 58, 59 Gate resistor

Claims (8)

A plurality of diodes connected in a bridge and performing a rectifying operation; and a semiconductor switching element individually connected in parallel with each of the diodes or integrally formed with each of the diodes; The power generated by the generator motor is rectified and supplied to the DC power source during power generation operation of the generator motor, and the DC power supplied from the DC power source is converted into AC power during the motor operation of the generator motor. And an AC / DC conversion circuit for supplying power to the generator motor,
A control circuit for intermittently controlling the semiconductor switching element by applying a control voltage to a control electrode of the semiconductor switching element;
With
The control circuit includes:
The semiconductor switching element is intermittently controlled by applying a control voltage having a predetermined waveform to the control electrode of the semiconductor switching element during the power generation operation, and the AC / DC conversion circuit is synchronously rectified during the power generation operation. A generator motor control apparatus for a vehicle, wherein the synchronous rectification operation is stopped when the rotational speed exceeds a predetermined value during the power generation operation based on an electric quantity related to the rotational speed. A plurality of diodes connected in a bridge and performing a rectifying operation; and a semiconductor switching element individually connected in parallel with each of the diodes or integrally formed with each of the diodes; The power generated by the generator motor is rectified and supplied to the DC power source during power generation operation of the generator motor, and the DC power supplied from the DC power source is converted into AC power during the motor operation of the generator motor. And an AC / DC conversion circuit for supplying power to the generator motor,
A control circuit for intermittently controlling the semiconductor switching element by applying a control voltage to a control electrode of the semiconductor switching element;
With
The control circuit includes:
Based on a physical quantity related to the rotational speed of the generator motor, a state transition waveform of a control voltage applied to the control terminal of the semiconductor switching element when the rotational speed is a predetermined value or more, and the semiconductor switching element when the rotational speed is a predetermined value or less. A vehicular generator motor control device characterized by a sharpening as compared with a state transition waveform of a control voltage applied to a control terminal of the vehicle. In the vehicular generator motor control device according to claim 2,
The control circuit includes:
The state transition waveform of the control voltage applied to the control terminal of the semiconductor switching element during the power generation operation when the rotational speed is equal to or higher than a predetermined value is the control of the semiconductor switching element during the electric operation when the rotational speed is equal to or lower than the predetermined value. A vehicular generator motor control device characterized by a sharpening as compared with a state transition waveform of a control voltage applied to a terminal. A plurality of diodes connected in a bridge and performing a rectifying operation; and a semiconductor switching element individually connected in parallel with each of the diodes or integrally formed with each of the diodes; The power generated by the generator motor is rectified and supplied to the DC power source during power generation operation of the generator motor, and the DC power supplied from the DC power source is converted into AC power during the motor operation of the generator motor. And an AC / DC conversion circuit for supplying power to the generator motor,
A control circuit for intermittently controlling the semiconductor switching element by applying a control voltage to a control electrode of the semiconductor switching element;
With
The control circuit includes:
Based on a physical quantity related to the current of the generator motor, a state transition waveform of a control voltage applied to the control terminal of the semiconductor switching element when the current is a predetermined value or less, and a control terminal of the semiconductor switching element when the current is a predetermined value or more Compared to the state transition waveform of the control voltage to be applied to the vehicle, the vehicle generator motor control device is made steep. In the vehicular generator motor control device according to claim 4,
The control circuit includes:
A state transition waveform of a control voltage applied to the control terminal of the semiconductor switching element during power generation operation when the current is less than a predetermined value is applied to the control terminal of the semiconductor switching element during electric operation when the current is greater than or equal to a predetermined value. A vehicular generator motor control device characterized by steepening compared to a state transition waveform of a control voltage to be applied. The vehicular generator motor control device according to any one of claims 2 to 5,
The control circuit includes:
Applying a gate voltage as the control voltage through a gate resistor having a predetermined resistance value to the gate electrode of the semiconductor switching element;
A vehicular generator motor control device that realizes a steep state transition waveform of the control voltage by switching a resistance value of the gate resistor. The vehicular generator motor control device according to any one of claims 2 to 5,
The control circuit includes:
Applying a gate voltage as the control voltage through a gate resistor having a predetermined resistance value to the gate electrode of the semiconductor switching element;
A vehicular generator motor control device that realizes a steep state transition waveform of the control voltage by conduction of a short-circuit switch connected in parallel with the gate resistor. In the vehicular generator motor control device according to any one of claims 1 to 7,
The control circuit includes:
A vehicular generator / motor control apparatus that drives the semiconductor switching element through a gate resistor having a maximum resistance value when the generator / motor connected to the vehicular engine is started.

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