JP2001069796A - Motor drive-controlling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a device where a battery is inversely connected, and at the same time to start an engine by kick starting with a simple circuit configuration. SOLUTION: In a controller 2 where electromotive force generated by a brushless motor M by kick starting is supplied via a regulator 6, the connection state of a battery B is judged according to a detection signal outputted by a battery voltage interface 7. When the battery B is inversely connected, a relay 4c is turned off, and an ignition control circuit 9 is controlled so that an engine is not stared. Even when the battery B is inversely connected, a backward current does not flow by a diode 4a, and a control system 1 is protected. Also, the relay 4c is turned off, thus preventing voltage from being supplied to the power supply part of drivers 3b and 8b for protecting. When the battery B is not inversely connected, the relay 4c is turned on, the ignition control circuit 9 is controlled, and the engine is started. The relay 4c is turned on, thus charging the battery that has gone dead.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling a motor in a motor generator and the like, and more particularly to a technique effective when applied to drive control of a three-phase brushless motor provided in a vehicle such as an automobile or a motorcycle. It is.

[0002]

2. Description of the Related Art In the case of a brassless motor used as a starter of an automobile or a motorcycle, its driving is controlled by a motor driving circuit, and this motor control circuit controls a driver for driving a brushless motor and the driver. For the controller.

[0003] The motor control circuit is provided with a reverse connection protection circuit. In this reverse connection protection circuit, the positive electrode and the negative electrode of the battery are connected in reverse via a diode for returning inductance energy provided in the driver unit.
This prevents a device such as a motor control circuit from being damaged by a reverse current flowing in the case of a so-called battery reverse connection.

The reverse connection protection circuit includes a reverse connection protection diode,
It consists of a relay and a relay drive circuit. The anode of the reverse connection protection diode is connected to the positive electrode of the battery,
One connection of the relay coil is connected to the cathode.

[0005] A relay drive circuit is connected to the other connection portion of the relay coil. The relay driving circuit drives the relay based on a signal from the controller. One contact of the relay is connected to the positive electrode of the battery, and the other contact is connected to a power supply for supplying a power supply voltage to the driver.

With such a configuration, reverse connection protection is performed by turning on the relay only when the battery is normally connected and a normal voltage is applied to the above-described relay drive circuit.

[0007]

However, it has been found by the present inventors that the following problems are encountered with the reverse connection protection technique in the motor control circuit as described above.

For example, when the above-described motor control circuit is used for a starter dynamo of a motorcycle or the like, the relay does not turn on when the kick is started when the battery is dead, so that the current of the starter dynamo generated by the kick is applied to the ignition. There is a problem that the battery cannot be flown from the circuit, the engine cannot be started, and the battery cannot be charged from the starter dynamo.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor drive control device which can achieve both device protection for battery reverse connection and engine start by kick start with a simple circuit configuration.

[0010]

SUMMARY OF THE INVENTION A motor drive control device according to the present invention includes a battery detection section for outputting a detection signal from the voltage of a battery, and a driver for driving a motor which is a motor generator. A switching unit that supplies a voltage, and a connection state of the battery is determined based on a detection signal of the battery detection unit. When the battery is not reversely connected, a control signal for turning on the switching unit is output. The control unit outputs a control signal that turns off the switching unit when the switching unit is turned off, and supplies a voltage generated by the motor when the switching unit is turned off to a regulator that generates an operating voltage of the control unit. And a second protection diode for performing device protection when the battery is connected in reverse. And it said that there were pictures.

Further, in the motor drive control device according to the present invention, the switching unit is a relay or a transistor.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory diagram of circuit blocks in a control system for controlling a starter dynamo according to an embodiment of the present invention.

In the present embodiment, the control system 1
Is provided in a motorcycle or the like, and performs drive control and ignition control of the three-phase brushless motor M. The brushless motor M is used as a starter dynamo which is a motor at the time of starting, and is a motor generator which becomes a generator after starting and at the time of kick starting using a kick pedal.

Control system (motor drive control device) 1
Are a controller (control unit) 2, a driver unit 3, a reverse connection protection circuit (voltage protection means) 4, a relay drive circuit 5, a regulator 6, a battery voltage interface (battery detection unit) 7, an electromotive force control circuit 8, and an ignition It comprises a control circuit 9.

The controller 2 is composed of, for example, a microcomputer, and controls all controls of the control system 1. The driver unit 3 includes a pre-driver 3a and a driver 3
b. The pre-driver 3a is connected to the controller 2, and drives the driver 3b based on the control of the controller 2.

The driver 3b includes a MOSFET (Meta)
l Oxide Semiconductor Fie
A three-phase bridge circuit is configured by transistors T1 to T6, which are ld Effect Transistors.

Diodes D1 to D6 are connected between the drains and the sources of the transistors T1 to T6 for returning the inductance energy, and drive the brushless motor M based on the driving signal output from the pre-driver 3a. I do.

The reverse connection protection circuit 4 comprises diodes 4a, 4
b, and a relay (switching unit) 4c to prevent device destruction of the control system 1 when the battery B is connected in reverse. The relay driving circuit 5 includes a relay 4c connected based on a control signal output from the controller 2.
Drive.

The regulator 6 converts a power supply voltage V _{B of} about 12 V supplied from the battery B through an ignition switch IGSW into a power supply voltage V _{CC of} about 5 V,
It is supplied to the controller 2 and the like. The battery voltage interface 7 detects a reverse connection in which the positive electrode and the negative electrode of the battery B are connected in reverse, and outputs a detection signal to the controller 2.

Diode (second protection diode) 4a
The anode of one of the contact portion of the relay 4c, and the battery voltage interface 7, the power supply voltage V _B supplied from the battery B through the ignition switch IGSW is supplied.

A cathode of a diode (first protection diode) 4b and a relay 4
One of the coil connection portions c and the input portion of the regulator 6 are connected. In the other coil connection part of the relay 4c,
A relay drive circuit 5 is connected, and an anode of a diode 4b, a driver 3
b, the power supply of the driver 8b is connected.

The electromotive force control circuit 8 includes a pre-driver 8a,
It comprises a driver 8b and a sense interface 8c, and controls the electromotive force of the brushless motor M. The pre-driver 8a is connected to the controller 2 and drives the driver 8b based on the control of the controller 2.

The driver 8b is connected to the pre-driver 8a, and drives the field coil FC based on a driving signal output from the pre-driver 8a. The field coil FC is an electromagnet provided in the brushless motor M, and controls the electromotive force of the brushless motor M by the field coil FC.

The sense interface 8c includes a detection sensor R for detecting the position of the rotor in the brushless motor M.
The waveform of the voltage signal output from S is shaped and input to the controller 2. The controller 2 detects the rotation of the rotor in the brushless motor M based on the signal output from the sense interface 8c.

The ignition control circuit 9 is connected to the controller 2 and applies an ignition voltage to the ignition coil IC based on a signal output from the controller 2 to the diode 4b.
Feed through. The ignition coil IC generates a high voltage required for ignition from the supplied voltage, and supplies it to the ignition plug SP.

Next, the operation of this embodiment will be described.

First, when the battery B is reversely connected, the battery is dead, or the battery B is disconnected, the brushless motor M is not driven even if the user presses a starter button to start the engine to rotate the brushless motor M. .

At this time, even if the battery B is reversely connected,
Since no reverse current flows through the control system 1 by the diode 4a, the devices of the control system 1 are protected.

When the kick start is performed using the kick pedal, the electromotive force generated by the brushless motor M is supplied to the regulator 6 via the diodes D1 to D3 and the diode 4b. The regulator 6 converts the power supply voltage generated by the brushless motor M into a power supply voltage V _{CC of} about 5 V and supplies the power supply voltage V _CC to the controller 2.

The controller 2 supplied with the power supply voltage V _CC
Is in the operating state, and whether the detection signal output from the battery voltage interface 7 is out of the battery B,
Alternatively, it is determined whether or not the battery B is connected in reverse.

Here, the battery voltage interface 7 will be described.

The battery voltage interface 7 comprises a photocoupler or the like. For example, when the battery B is connected in reverse, the photodiode of the photocoupler is connected so as to emit light.

When the battery B is connected in reverse, the transistor in the photocoupler is turned on by the light emission of the photodiode, and a detection signal is output.
The controller 2 detects that the battery B is connected in reverse.

When it is detected by the detection signal of the battery voltage interface 7 that the battery B is reversely connected, the controller 2 controls the relay drive circuit 5 so that the relay 4c is turned off, and the engine 2 The ignition control circuit 9 is controlled so as not to start.

As described above, even if the battery B is connected in reverse, no reverse current flows to the control system 1 by the diode 4a, and the devices of the control system 1 are protected. Also, the controller 2 turns off the relay 4c.
As a result, the reverse voltage of the reversely connected battery B is not applied to the power supply units of the drivers 3b and 8b, and the devices of the drivers 3b and 8b are protected.

Next, when it is determined from the detection signal of the battery voltage interface 7 that the battery B is not connected in reverse, the controller 2 outputs a control signal to the relay drive circuit 5 to turn on the relay 4c. At the same time, an ignition control signal is output to the ignition control circuit 9 to start the engine.

Further, when the relay 4c is turned on, the battery B can be charged when the voltage of the battery B is lowered, that is, when the battery B is dead, not when the battery B is disconnected.

Thus, according to the present embodiment, by providing the reverse connection protection circuit 4 in the control system 1, the engine is kick-started even when the battery is dead while protecting the device by the reverse connection of the battery B. Thus, the reliability and operability of a motorcycle or the like using the control system 1 can be improved.

In this embodiment, the relay 4c is provided as a reverse connection protection circuit for preventing a reverse voltage from being applied to the power supply sections of the drivers 3b and 8b when the battery B is connected in the reverse direction. Instead of the relay 4c, a transistor 10 such as an FET may be used.

In this case, as shown in FIG. 2, a driver 11 is connected to the gate of the transistor 10.
To one end of the transistor 10 is supplied with the power supply voltage V _B of the battery B through the ignition switch IGSW, the anode of the diode 4b in the other coupling part, and the driver 3b, the power supply unit of 8b It is connected.

The driver 11 turns on the transistor 10 based on the control signal output from the controller 2.
By performing N / OFF control, the drivers 3b and 8b
The power supply to the power supply unit is controlled.

Further, in the present embodiment, the control system for controlling the starter dynamo provided in the motorcycle or the like has been described, but the control system for controlling the generator may be provided with a reverse connection protection circuit.

The present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the scope of the present invention.

[0045]

(1) According to the present invention, the voltage protection means can achieve both device protection by reverse connection of the battery and kick start of the engine when the battery is dead.

(2) In the present invention, the reliability of the motor drive control device can be improved by the above (1).

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of circuit blocks in a control system for controlling a starter dynamo according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of circuit blocks in a control system for controlling a starter dynamo according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Control system (motor drive control device) 2 Controller (control part) 3 Driver part 3a Pre-driver 3b Driver 4 Reverse connection protection circuit (voltage protection means) 4a Diode (second protection diode) 4b Diode (first protection diode) 4c relay (switching unit) 5 relay drive circuit 6 regulator 7 battery voltage interface (battery detecting unit) 8 electromotive force control circuit 8a pre-driver 8b driver 8c sense interface 9 ignition control circuit 10 transistor (switching unit) 11 driver T1 T6 Transistor D1 to D6 Diode M Brushless motor B Battery IGSW Ignition switch FC Field coil RS Detection sensor IC Ignition coil SP Spark plug V _B power supply voltage V _CC power supply voltage

Continued on the front page F term (reference) 5H590 AA01 AA08 AA09 AA10 AB05 AB20 CA07 CA23 CC01 CC18 CC24 CD01 CE05 DD32 DD64 EA01 EA10 EB02 EB21 FA05 FA06 FA08 FB01 FC14 FC17 FC25 GA02 GB05 HA02 HA11 JA02

Claims (2)

[Claims] A battery detection unit that outputs a detection signal based on a voltage of a battery; a switching unit that supplies a power supply voltage to a driver that drives a motor that is a motor generator based on a control signal; Based on the detection signal, the connection state of the battery is determined, and when the battery is not reversely connected, a control signal for turning on the switching unit is output. When the battery is reversely connected, the switching signal is output. A control unit that outputs a control signal that causes the unit to be in a non-conductive state; and a first unit that supplies a voltage generated by the motor when the switching unit is in a non-conductive state to a regulator that generates an operating voltage of the control unit. Voltage protection means comprising a protection diode and a second protection diode for performing device protection when the battery is reversely connected. Motor drive control device, characterized and. 2. The motor drive control device according to claim 1, wherein the switching unit is a relay or a transistor.