JP3051441U - Brushless DC motor drive circuit protection device - Google Patents

Abstract

(57) [Summary] [Objective] A motor coil and a drive circuit element can be protected from burning, and a stable operating voltage can be provided to a phase inversion detection element. In addition, a brushless DC motor drive circuit has various types of operation. It is an object of the present invention to provide a brushless DC motor drive circuit protection device that can be applied to voltage, can detect the rotation speed of a motor, can detect a warning, and can detect a failure, and can control a closed circuit. SOLUTION: A phase inversion detecting element 2 detects a position of a coil 4A, 4B of a motor and outputs a signal, and a control element 5
A and 5B receive the phase inversion signal of the phase inversion detection element 2 and control conduction or disconnection of the current of the motor coil,
The voltage regulator 1 provides a stable operating voltage to the phase inversion detecting element 2 to limit the magnitude of the current passing through the phase inversion detecting element 2, and the steady state current device 3 passes through the motor coil and the control element. It is configured to limit the current to protect the coil of the motor.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a protection device for a brushless DC motor drive circuit.

[0002]

[Prior art]

 Conventionally, this type is as follows. A conventional brushless DC motor drive circuit generally uses a Hall effect inductive element, that is, a phase inversion detecting element is used to detect the magnetic direction of the motor coil, and the two motor coil transistors conduct. By controlling the cutting and cutting, a magnetic field in the same magnetic direction as the Hall effect inducing element is generated. When the direction of the magnetic field generated by the motor coil is the same as the direction of the magnetism of the Hall effect induction element, the rotor is continuously rotated in the same direction due to the same polarity repelling property. Then, if the rotor changes to another magnetic area, when the Hall effect inductive element searches for a different magnetic direction, the transistor changes from a conductive state to a disconnected state, and another set of motor coils is turned on. By being conducted, the same magnetism as that of the Hall effect induction element is generated again, and it can be urged that the rotor rotates again. In this manner, the rotor of the two sets of coils is configured to be able to rotate without stopping by continuously conducting or disconnecting the transistors in turn.

The following problems can be pointed out with respect to the conventional technology. Regarding the structure described in the above-mentioned conventional technology, overload operation or long-time operation of the motor causes the temperature of the motor coil to become too high, causing insulation deterioration, and in severe cases, burning. It even happens. In addition, since the motor coil is a load of electromagnetic induction, the current of the coil cannot change instantaneously, so that conduction or disconnection cannot be instantaneously switched. When the transistor switches from the conductive state to the disconnected state in this way, the energy of the electromagnetically induced current of the motor coil must be forced to release energy, so that the transistor often burns. The present invention improves not only the drawbacks of the conventional brushless DC motor drive circuit, but also increases the efficiency of motor operation by increasing the protection circuit and output control circuit, as well as the failure rate of the motor coil and drive circuit. Can be greatly reduced. Further, search or feedback control can be performed on the electric motor based on the output signal of the control circuit.

[0004]

[Problems to be solved by the invention]

 The present invention has been made in view of such problems of the prior art, and aims at providing the following things. The main object of the present invention is to provide a protection device for a brushless DC motor drive circuit, and by providing a constant current device, can protect the motor coil and the elements of the drive circuit from burning. The second object of the present invention is to provide a protection device for a brushless DC motor drive circuit, provide a stable operating voltage to a phase inversion detecting element by providing a voltage regulator, and further combine with a constant current device. Accordingly, the brushless DC motor drive circuit can be applied to various kinds of operating voltages, for example, voltages of 12V, 24V, 36V, 48V and the like. A third object of the present invention is to provide a protection device for a brushless DC motor drive circuit, and by providing an output control circuit, an output signal of this control circuit can be detected for the motor, and for example, a rotation Speed detection, warning detection, and failure detection can be detected, and a closed circuit can be controlled by adding one feedback device using the output signal.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the protection device of the brushless DC motor drive circuit of the present invention is as follows. That is, the protection device for the brushless DC motor drive circuit according to the present invention includes a minimum set of motor coils 4A and 4B, a phase inversion detection element 2, control elements 5A and 5B, a voltage regulator 1, a constant current device 3, a waveform processing device. 6 and an output control circuit 7, the phase inversion detecting element 2 can detect the position of the motor coils 4A, 4B and output a signal, and the control elements 5A, 5B are the phase inversion detecting elements 2 The voltage regulator 1 provides a stable operating voltage to the phase inversion detecting element 2 and controls the current passing through the phase inversion detecting element 2. The constant current device 3 protects the motor coil by limiting the current passing through the motor coil and the control element, and the waveform processor 6 amplifies the signal of the phase inversion detection element 2 to increase the power level. Applied to the drive and control of the DC motor, the output control circuit 7 outputs an output signal of the phase inversion detecting element 2, a structure in which as possible out to the control of probing and the feedback of the motor.

In this case, the following configuration can be adopted. First. The waveform processor 6 can amplify the output signal of the phase inversion detecting element 2. Second. The output control circuit 7 outputs the signal of the waveform processor 6 and can be used for detecting or controlling the brushless DC motor. Third. The constant current device 3 can be a thermistor. Fourth. The voltage regulator 1 can be a Zener diode. Fifth. The current regulator 11 is included in the voltage regulator 1, and the purpose of the current limiting protection can be achieved by the current limiting resistor 11. Sixth. The waveform processor 6 can be a transistor amplifier or an operational amplifier. Seventh. A zener diode 61 is included between the waveform processor 6 and the control elements 5A and 5B, and the zener diode 61 can be used to increase the tolerance of a noise signal. No. 8. The control elements 5A and 5B are transistors, and additionally include diodes 51A and 51B for releasing energy, so that a circuit for releasing energy can be provided. No. 9. The output control circuit 7 can be an open collector output.

[0007]

[Embodiment of the invention]

 An embodiment of the invention will be described below with reference to the drawings. In the flow chart of the protection device for a brushless DC motor drive circuit of the present invention shown in FIG. 1, the present invention provides a voltage regulator 1 for providing a stable operating voltage and a phase inversion detecting element for providing a stable current. 2 and a constant current device 3, two control elements 5A and 5B for controlling conduction and disconnection of the motor coils 4A and 4B, a waveform processor 6 for processing signal amplification, and an output control circuit 7. It consists of: Since the voltage regulator 1 can provide a stable operating voltage, the phase inversion detecting element 2 can have a stable operating voltage, and further utilizes the current limiting characteristic of the reverse breakdown voltage area of the diode 10. However, the magnitude of the current passing through the phase inversion detection element 2 can be limited to protect the phase inversion detection element 2. The constant current device 3 controls the magnitude of the current passing through the control elements 5A, 5B and the motor coils 4A, 4B, thereby avoiding deterioration or burning due to excessive current. In addition, the waveform processor 6 performs an amplification process on the signal of the phase inversion detection element 2 so that the waveform processor 6 can be applied to driving and control of a high-power DC motor. Further, the present invention includes an output control circuit 7, which outputs a signal from the waveform processor 6 and provides various kinds of detection to the electric motor. Circuit control can be performed.

[0008]

Embodiment 1 In the first embodiment of the protection device for a brushless DC motor drive circuit of the present invention shown in FIG. 2, since the voltage regulator 1 is constituted by a Zener diode, the phase inversion detecting element 2 is stable. Operating voltage. The phase inversion detecting element 2 is composed of a Hall effect IC, utilizes the current limiting characteristic of the reverse breakdown voltage area of the Zener diode, and then passes through the phase inversion detecting element 2 by combining the current limiting resistor 11. The magnitude of the current can be limited to protect the phase inversion detecting element 2. The constant current device 3 can limit the magnitude of the current passing through the control elements 5A and 5B. The control elements 5A and 5B are composed of transistors or thyratrons. The control elements 5A and 5B can protect the motor coils 4A and 4B from being deteriorated or burnt due to excessively large current. The constant current device 3 is composed of a thermistor having a positive temperature coefficient (PTC). If the current is too large, the thermistor also becomes current-limiting by increasing the resistance value as the temperature rises, and thus the current is stable. Can be kept. Further, the constant current device 3 is also formed of an inductor, and can suppress a large change in the coil current. The waveform processor 6 performs an amplification process on the signal of the phase inversion detection element 2 so that the waveform processor 6 can be applied to driving and control of a high-power DC motor. The waveform processor 6 is composed of a transistor amplifier, and can be connected to the zener diode 61 to increase the tolerance of the circuit's miscellaneous signals. Therefore, the electric leakage phenomenon can be prevented, and the two sets of motor coils 4A and 4B can be prevented. Can be avoided at the same time. Further, according to the effects of the voltage regulator 1 and the constant current device 3, the present embodiment can be applied to various voltages, for example, voltages of 12V, 24V, 36V, 48V and the like.

[0009]

Embodiment 2 In the second embodiment of the protection device for a brushless DC motor driving circuit of the present invention shown in FIG. 3, a diode 10 is included. The main purpose of the diode 10 is to protect the circuit and the power supply in the reverse direction. Since the voltage regulator 1 is composed of a Zener diode, the phase inversion detecting element 2 has a stable operating voltage. be able to. The phase inversion detecting element 2 is constituted by a Hall effect induction element THS119, utilizing the current limiting characteristic of the reverse breakdown voltage area of the Zener diode, and then combining the current limiting resistor 11 with the current passing through the phase inversion detecting element 2. The phase inversion detection element 2 can be protected by limiting the magnitude of the phase inversion. The constant current device 3 can limit the magnitude of the current passing through the control elements 5A and 5B. The control elements 5A and 5B are composed of transistors or thyratrons. The control elements 5A and 5B can protect the motor coils 4A and 4B from being deteriorated or burnt due to excessively large current. The constant current device 3 is composed of a thermistor having a positive temperature coefficient (PTC). If the current is too large, the thermistor also becomes current-limiting by increasing the resistance value as the temperature rises, and thus the current is stable. Can be kept. Further, the constant current device 3 is also formed of an inductor, and can suppress a large change in the coil current. The waveform processor 6 performs an amplification process on the signal of the phase inversion detection element 2 so that the waveform processor 6 can be applied to driving and control of a high-power DC motor. The waveform processor 6 is composed of an operational amplifier BA10358F, and the waveform processor 6 further has the function of a comparator. Therefore, the control elements 5A and 5B can obtain a square wave signal having a perfect waveform, so that conduction and The state of the cut will be more accurate. Further, in the circuit of the present invention, a transistor protection device, that is, energy discharging diodes 51A and 51B are additionally provided. Therefore, when the transistors 5A and 5B change from the conductive state to the disconnected state, the electromagnetically induced current cannot change instantaneously. To protect the transistor.

In addition, the present invention can provide an output control circuit 7. In the output control circuit 7, since the output of the open collector is formed by the open collector transistor 71, the output signal can be prevented from being weakened by increasing the output resistance. According to the present embodiment, when the motor rotates in a normal state, a perfect square wave signal is output from the output control circuit 7 at this time, and various detections are performed on the motor by the output signal. For example, rotation speed, warning and fault detection can be provided, and one feedback device can be added to control the closed circuit.

[0011]

[Effect of the invention]

 Since the present invention is configured as described above, the following effects can be obtained. The protection device for the brushless DC motor drive circuit of the present invention eliminates the problem that the motor coil and the elements of the drive circuit are burned by providing a constant current device, and the phase inversion by providing a voltage regulator. Since a stable voltage can be provided to the detection element, it can be applied to various types of operating voltages. Further, by providing the output control circuit, the output signal of the control circuit can search the motor for the rotation speed, warning, and failure, which is actually practical.

[Brief description of the drawings]

FIG. 1 is a flowchart of a protection device for a brushless DC motor driving circuit according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a protection device for a brushless DC motor driving circuit according to a first embodiment of the present invention;

FIG. 3 is a circuit diagram showing a protection device for a brushless DC motor driving circuit according to a second embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Voltage regulator 10 Diode 11 Current limiting resistance 2 Phase inversion detecting element 3 Constant current device 4A Motor coil 4B Motor coil 5A Control element 5B Control element 51A Energy emitting diode 51B Energy emitting diode 6 Waveform processor 61 Zener diode 7 Output Control circuit 71 Open collector transistor

Claims (12)

[Utility model registration claims] 1. A minimum set of motor coils (4A, 4A)
B), phase inversion detecting element (2), control element (5A, 5
B), a voltage regulator (1) and a constant current device (3), and the phase inversion detecting element (2) is a motor coil (4).
A, 4B) can detect the position and output a signal, and the control element (5A, 5B) is a phase inversion detection element (2).
The voltage regulator (1) provides a stable operation voltage to the phase inversion detecting element (2), and controls the conduction or disconnection of the current of the motor coil. Limiting the magnitude of the current passing through the element (2),
The protection device for a brushless DC motor drive circuit, wherein the constant current device (3) protects the motor coil by limiting a current passed through the motor coil and the control element. 2. A brushless DC motor drive circuit according to claim 1, further comprising a waveform processor, wherein the waveform processor is capable of amplifying an output signal of the phase inversion detecting element. apparatus. 3. An output control circuit (7) is included, the output control circuit (7) outputting a signal of a waveform processor (6), which can be used for detecting or controlling a brushless DC motor. Item 2. A protection device for a brushless DC motor drive circuit according to Item 1. 4. The protection device for a brushless DC motor drive circuit according to claim 1, wherein the constant current device is a thermistor. 5. The protection device for a brushless DC motor drive circuit according to claim 1, wherein the voltage regulator is a Zener diode. 6. The brushless DC motor drive circuit according to claim 1, wherein the voltage regulator (1) includes a current limiting resistor (11), and the purpose of the current limiting protection can be achieved by the current limiting resistor (11). Protective equipment. 7. A minimum set of motor coils (4A, 4A)
B), phase inversion detecting element (2), control element (5A, 5
B), a voltage regulator (1), a constant current device (3), and a waveform processor (6). The phase inversion detecting element (2) detects the position of the motor coils (4A, 4B) and outputs a signal. The control elements (5A, 5B) receive the signal of the phase inversion of the phase inversion detection element (2), can control the conduction or disconnection of the current of the motor coil, and can control the voltage regulator (1). ) Provides a stable operating voltage to the phase inversion detection element (2), limits the magnitude of the current passing through the phase inversion detection element (2), and the constant current device (3) passes through the motor coil and the control element. A brushless DC, characterized in that the current is limited to protect the motor coil, and the waveform processor (6) amplifies the signal of the phase inversion detecting element (2) and applies it to the driving and control of a high-power DC motor. Protection device for motor drive circuit. 8. The protection device for a brushless DC motor drive circuit according to claim 7, wherein the waveform processor is a transistor amplifier or an operational amplifier. 9. A waveform processor (6) and a control element (5A, 5A).
8. The brushless DC motor driving circuit protection device according to claim 7, wherein a Zener diode (61) is included between the protection circuit and B), and the Zener diode (61) can be used to increase the tolerance of a noise signal. 10. The control element (5A, 5B) is a transistor, and additionally has an energy emitting diode (51A, 5B).
51. The protection device for a brushless DC motor drive circuit according to claim 7, wherein the protection circuit includes a circuit for discharging energy. 11. A minimum set of motor coils (4A, 4A)
B), phase inversion detecting element (2), control element (5A, 5
B), comprising a voltage regulator (1), a constant current device (3) and an output control circuit (7), and a phase inversion detecting element (2)
Can detect the position of the motor coil (4A, 4B) and output a signal. The control element (5A, 5B) receives the signal of the phase inversion of the phase inversion detection element (2), and outputs the current of the motor coil. The voltage regulator (1) provides a stable operating voltage to the phase inversion detecting element (2) and limits the magnitude of the current passing through the phase inversion detecting element (2). The constant current device (3) limits the current passing through the motor coil and the control element to protect the motor coil, and the output control circuit (7) outputs the output signal of the phase inversion detection element (2), A protection device for a brushless DC motor drive circuit, which is capable of controlling detection and feedback. 12. The protection device for a brushless DC motor drive circuit according to claim 11, wherein the output control circuit (7) outputs the output of the open collector.