KR20170017815A - Motor driving circuit and motor component - Google Patents

Abstract

Provided are a motor driving circuit and a motor part. The motor driving circuit comprises: a bidirectional AC switch which passes through both terminals of an external AC power supply, which is connected to a motor in series, and which is connected between first and second nodes; a rectification circuit; a magnetic sensor which detects a magnetic field of a rotor and which outputs a magnetic induction signal corresponding to the magnetic field; first and second voltage drop circuits which are connected between a first input terminal of the rectification circuit and the first node in series, between which a third node is present therebetween, and the first voltage drop circuit of which is connected between the first node and the third node; a switching circuit which is connected between the third node and a control terminal of the bidirectional AC switch and which includes a first terminal, a second terminal, a control terminal, and a switch disposed between the first and second terminals; and a switch control circuit which is connected between the control terminal of the switching circuit and an output terminal of the magnetic sensor.

Description

TECHNICAL FIELD [0001] The present invention relates to a motor driving circuit,

The present disclosure relates to the field of motor drive technology, and more particularly to motor drive circuitry and motor components.

Conventional motor drive circuits include bidirectional ac switches and associated control circuitry. The voltage drop circuit is arranged at the input terminal of the control circuit to provide a low supply voltage for the control circuit. The driving current for the control terminal of the bidirectional ac switch is controlled by a voltage drop circuit.

A solution for increasing the drive current for the bidirectional ac switch in the motor drive circuit without changing the value of the supply voltage for the control circuit is provided according to an embodiment of the present disclosure.

In order to achieve the above object, the following technical solution is provided according to the embodiment of the present disclosure.

A motor drive circuit is provided. The motor drive circuit comprises:

A current switch-current switch connected in series with the motor at two terminals of the power supply, the first switch being connected between the first node and the second node;

A rectifier circuit having a first input terminal and a second input terminal;

A first voltage drop circuit and a second voltage drop circuit that are connected in series between the first input terminal of the rectifying circuit and the first node and a third node exists between the first voltage drop circuit and the second voltage drop circuit, 1 voltage drop circuit is connected between the first node and the third node; And

The switch circuit-switch circuit connected between the third node and the control terminal of the current switch includes a first terminal, a second terminal, a control terminal, and a switch arranged between the first terminal and the second terminal .

Preferably, in the motor drive circuit described above,

A magnetic sensor configured to sense a magnetic field of a rotor of the motor and output a corresponding magnetic induction signal; And

And a switch control circuit connected between the control terminal of the switch circuit and the output terminal of the magnetic sensor.

Preferably, in the motor drive circuit described above, the power source is an AC power source, and the switch control circuit comprises:

The AC power source is in the positive half-cycle and the magnetic field of the rotor is at the predetermined first polarity, or when the AC power source is in the negative half-cycle and the magnetic field of the rotor is at the second polarity opposite to the first polarity, Turning on the current path between the first terminal and the second terminal of the circuit and turning on the current switch; And

The AC power source is in the negative half-cycle and the current path between the first terminal and the second terminal of the switch circuit is selected when the rotor is at the first polarity or when the AC power source is in the positive half-cycle and the rotor is at the second polarity Off and turns off the current switch.

Preferably, in the motor drive circuit described above, the switch circuit is provided with a first current path and a second current path which are selectively turned on, and the first current path and the second current path are connected to the first terminal of the switch circuit, The first current path is turned on when the alternating current power source is in the positive half-cycle and the magnetic field of the rotor is in the first polarity, and the second current path is switched on when the alternating- And is turned on when the magnetic field of the rotor has a second polarity opposite to the first polarity.

Preferably, in the motor drive circuit described above, the first current path is provided with a first switch for turning on or off the first current path, and the second current path is for turning on or off the second current path And the control terminal of the first switch is connected to the control terminal of the second switch so as to form the control terminal of the control circuit.

Preferably, in the motor drive circuit described above, the first switch and the second switch are a pair of complementary semiconductor switches.

Preferably, in the motor drive circuit described above, the power source is an AC power source, and the motor drive circuit comprises:

When the AC power source operates in the positive half-cycle and the polarity of the magnetic field of the rotor is the predetermined first polarity or when the AC power source operates in the negative half-cycle and the polarity of the magnetic field of the rotor is opposite to the first polarity In the case of polarity, the current flows through the control terminal of the switch circuit so as to turn on the current path between the first terminal of the switch circuit and the second terminal of the switch circuit after passing through the first voltage drop circuit and the second voltage drop circuit And then flows through the control terminal of the current switch after passing through the first voltage drop circuit and the current path.

Preferably, in the motor drive circuit described above, the equivalent resistance of the first voltage drop circuit is lower than the equivalent resistance of the second voltage drop circuit.

Preferably, in the above-described motor drive circuit, the current flowing through the first voltage drop circuit when the current path between the first terminal and the second terminal of the switch circuit is turned on is the first Is higher than the current flowing through the voltage drop circuit.

Preferably, in the motor drive circuit described above, the switch control circuit is configured to turn on or off the current path between the first terminal of the switch circuit and the second terminal of the switch circuit, based on the polarity of the power supply and the magnetic induction signal do.

Preferably, in the motor drive circuit described above, the switch control circuit may include a third switch and a fourth switch; The third switch is connected to the third current path, the third current path is arranged between the control terminal of the switch circuit and the high voltage output terminal of the rectifying circuit;

The fourth switch is connected in the fourth current path, and the fourth current path is arranged between the control terminal of the switch circuit and the low voltage output terminal of the rectifying circuit.

Preferably, in the motor drive circuit described above, the switch control circuit includes a first current path through which current flows to the control terminal of the switch circuit, a second current path through which current flows to the control terminal of the switch circuit, The switch being controlled by a magnetic induction signal to selectively turn on one of the first current path and the second current path.

Preferably, in the motor drive circuit described above, there is no switch in the other of the first current path and the second current path.

Preferably, in the motor drive circuit described above, the input terminal of the switch control circuit is connected to the high-voltage output terminal of the rectifying circuit, the output terminal of the switch control circuit is connected to the control terminal of the switch circuit, The ground terminal of the magnetic sensor is connected to the low voltage output terminal of the rectifying circuit and the output terminal of the magnetic sensor is connected to the control terminal of the switch control circuit.

Preferably, in the motor drive circuit described above, the power source is an AC power source, and the magnetic sensor is configured such that when the AC power source operates in the positive half-cycle and the polarity of the magnetic field of the rotor is in the second polarity, And the magnetic sensor forms a path between the input terminal of the magnetic sensor and the ground terminal of the magnetic sensor when the polarity of the magnetic field of the rotor is the first polarity, And a path between the control terminal of the magnetic sensor and the ground terminal of the magnetic sensor when the polarity of the magnetic field of the magnetic sensor is the second pole.

Preferably, in the motor drive circuit described above, the power source is an AC power supply, and the switch control circuit is connected to the input terminal of the switch control circuit when the AC power source is in the positive half-cycle and the polarity of the magnetic field of the rotor is the first polarity A path between the output terminal of the switch control circuit and a control terminal of the switch control circuit is provided between the output terminal of the switch control circuit and the control terminal of the switch control circuit when the AC power source operates in negative half- As shown in FIG.

Preferably, in the motor drive circuit described above, the motor is connected in series with a power source between the first node and the second node.

Preferably, in the motor drive circuit described above, the motor is connected in series with a current switch between the first node and the second node.

A motor component is provided, and the motor component includes a motor and the motor drive circuit described above.

Preferably, in the motor component described above, the motor includes a stator and a rotor, the stator includes a stator core and a single-phase winding wound on the stator core.

In order to illustrate the technical solutions in the embodiments of the present disclosure and in the prior art, the drawings used for the detailed description of this embodiment or the prior art will be briefly introduced hereinafter. Obviously, the drawings described below merely illustrate some embodiments of the present disclosure, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.
1A is a structural diagram of a motor drive circuit according to an embodiment of the present disclosure;
1B is a structural diagram of a motor drive circuit according to another embodiment of the present disclosure.
2 is a structural diagram of a switch circuit of a motor drive circuit according to another embodiment of the present disclosure.
3 is a structural diagram of a switch control circuit of a motor drive circuit according to an embodiment of the present disclosure.
4 is a structural diagram of a switch control circuit of a motor drive circuit according to another embodiment of the present disclosure.
5A is a structural diagram of a switch control circuit of a motor drive circuit according to another embodiment of the present disclosure.
5B is a structural diagram of a switch control circuit of a motor drive circuit according to another embodiment of the present disclosure.
6 is a structural diagram of a rectifying circuit of a motor driving circuit according to the embodiment of the present disclosure.
7 is a structural diagram of a magnetic sensor of a motor drive circuit according to the embodiment of the present disclosure.
8 is a structural view of a motor part according to the embodiment of the present disclosure.
9A-9F are diagrams of current paths in a motor drive circuit for different polarities of the magnetic field and different polarities of the power source according to embodiments of the present disclosure.

The technical solutions according to embodiments of the present disclosure will be described hereinafter and in full clarity in connection with the drawings in accordance with the embodiments of the present disclosure. Obviously, the described embodiments are only fewer than all of the embodiments of the present disclosure. All other embodiments that those skilled in the art have gained based on the embodiments of the present disclosure without any creative effort are within the scope of the present disclosure.

Although specific details are set forth in the following detailed description for a sufficient understanding of the present disclosure, the present disclosure may also be embodied in other ways different from the manner described herein. Those skilled in the art will be able to make similar elaborations without departing from the spirit of the present disclosure, and thus the present disclosure is not limited to the specific embodiments described hereinafter.

Hereinafter, the motor drive circuit according to the embodiment of the present disclosure exemplifies a motor drive circuit applied to the motor.

As shown in Figs. 1A and 1B, a motor drive circuit is provided according to an embodiment of the present disclosure. The motor drive circuit includes a bidirectional AC switch 100, a rectifier circuit 200, a magnetic sensor 500, a voltage drop circuit 300, a switch circuit 600, and a switch control circuit 400.

The bidirectional AC switch 100 is connected in series with the motor M at both terminals of the external AC power supply AC. The bidirectional AC switch 100 may be TRIAC and is connected between the first node A and the second node B. [ In addition, as shown in Fig. 1A, the motor M is connected in series with the AC power supply AC between the first node A and the second node B; The motor M is connected in series with the bidirectional AC switch 100 between the first node A and the second node B, as shown in Fig. 1B. The bidirectional ac switch 100 may include an electronic switch that allows current to flow in two directions, which may be a metal-oxide semiconductor field effect transistor, an AC-DC silicon-controlled conversion circuit, A bidirectional triode thyristor, an insulated gate bipolar transistor, a bipolar junction transistor, a thyristor, and an optical coupler. For example, two metal-oxide semiconductor field effect transistors can form a controllable bidirectional ac switch; The two AC-DC silicon-controlled conversion circuits can constitute a controllable bidirectional ac switch; Two insulated gate bipolar transistors can form a controllable bidirectional ac switch; Two bipolar junction transistors can form a controllable bidirectional ac switch.

The rectifier circuit 200 includes a first input terminal and a second input terminal. The rectifying circuit 200 is configured to convert an alternating current output from the alternating-current power supply (AC) into a direct current and output the direct current to a subsequent circuit.

The magnetic sensor 500 is configured to detect the magnetic field of the rotor of the motor M and output a corresponding magnetic induction signal. The magnetic sensor 500 is positioned near the rotor of the motor M to more accurately detect the variation of the magnetic field of the rotor.

The voltage drop circuit 300 is connected between the first input terminal of the rectifying circuit 200 and the first node A. [ The voltage drop circuit 300 includes a second voltage drop circuit 320 and a first voltage drop circuit 310 connected between the first input terminal of the rectifier circuit 200 and the first node. The third node is disposed between the first voltage drop circuit 310 and the second voltage drop circuit 320. The first voltage drop circuit 310 is connected between the first node and the third node. The first voltage drop circuit 310 and the second voltage drop circuit 320 generate a voltage drop required for the motor drive circuit and are equivalent to the first voltage drop circuit 310 and the second voltage drop circuit 320 The magnitude of the resistance can be set based on the requirements of the circuit. For example, in the technical solution disclosed in the embodiment of the present disclosure, the equivalent resistance of the first voltage drop circuit 310 is smaller than the equivalent resistance of the second voltage drop circuit 320. In at least one embodiment, the first voltage drop circuit 310 includes a first voltage drop resistor RA and the second voltage drop circuit 320 includes a second voltage drop resistor RB. It is to be understood that the structures of the first voltage drop circuit 310 and the second voltage drop circuit 320 are not limited thereto and other suitable voltage drop circuits may be used.

The switch circuit 600 is connected between the control terminal of the bidirectional AC switch 100 and the third node. The switch circuit 600 includes a first terminal, a second terminal, a control terminal, and a switch arranged between the first terminal and the second terminal.

The switch control circuit 400 is connected between the control terminal of the switch circuit 600 and the output terminal of the magnetic sensor 500. The switch control circuit 400 controls the ON state of the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 based on at least the magnetic field of the rotor of the motor .

In at least one embodiment, when the switch control circuit 400 turns on the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600, And the driving current flows through the switch circuit without passing through the second voltage drop circuit. Therefore, the driving current for the bidirectional AC switch 100 can be increased, and the bidirectional AC switch having a high driving current can be selected for the bidirectional AC switch 100. [ In another aspect, a bidirectional ac switch having a high drive current can withstand a high load current and thus meets the requirements for the application of a bidirectional ac switch with a high load current.

In at least one embodiment, bidirectional ac switch 100 may be implemented with other suitable types of switches. For example, the bidirectional ac switch 100 may include two silicon-controlled rectifiers connected in reverse-parallel to each other, and a corresponding control circuit may be provided to control the output voltage of the predetermined Control two silicon-controlled rectifiers.

In an embodiment of the present disclosure, the switch control circuit 400 is configured such that when the AC power source is in a positive half-cycle and the magnetic field of the rotor is at a predetermined first polarity, or when the AC power source is in a negative half- Directional AC switch 100 is turned on when the magnetic field of the switch circuit 600 is at the second polarity opposite to the first polarity, the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is turned on, ; When the AC power source is in a negative half-cycle and the rotor is at the first polarity, or when the AC power source is in the positive half-cycle and the rotor is at the second polarity, the first terminal of the switch circuit 600, Off switch 600 and turn off the bi-directional AC switch 100. The bi-

It should be noted that, in at least one embodiment, when the bi-directional AC switch 100 is turned on, the network power source may operate in a positive half-cycle or in a negative half-cycle. In this case, the switch circuit 600 is provided with a first current path and a second current path, which are selectively turned on through a switch arranged between the first terminal and the second terminal. In at least one embodiment, the equivalent resistance between the first current path and the second current path is less than the second voltage drop circuit 320. In this case, no current flows through the second voltage drop circuit 320 after the first current path or the second current path is turned on.

The first current path and the second current path are arranged between the first terminal of the switch circuit (600) and the second terminal of the switch circuit (600). When the AC power source is in the positive half-cycle and the magnetic field of the rotor is at the first polarity, the first current path is turned on and the current flows from the first terminal of the switch circuit 600 through the first current path, (600). If the AC power source is in a negative half-cycle and the magnetic field of the rotor is at a second polarity opposite to the first polarity, the second current path is turned on and the current flows through the second current path of the switch circuit 600 And flows from the second terminal to the first terminal of the switch circuit 600.

As shown in FIG. 2, it should be noted that, in at least one embodiment, the first current path is provided with a first switch K1 to turn the first current path on or off. A second switch K2 is provided on the second current path to turn the second current path on or off. The control terminal of the first switch K1 is connected to the control terminal of the second switch K2 to form the control terminal of the switch circuit 600. [ In at least one embodiment, the first switch K1 and the second switch K2 may be set as a pair of complementary semiconductor switches. For example, the first switch K1 is an NPN type semiconductor switch, and the second switch K2 is a PNP type semiconductor switch. When the AC power source is in the positive half-cycle and the magnetic field of the rotor is at the first polarity, the first switch K1 is turned on and the first current path is turned on as well. When the AC power source is in the negative half-cycle and the magnetic field of the rotor is at the second polarity, the second switch K2 is turned on and the second current path is turned on as well.

It should be noted that, in at least one embodiment, the current of the AC power source increases from zero or the AC power source decreases from zero after passing a zero point. Therefore, in the motor drive circuit, when the AC power source is in the positive half-cycle and the magnetic field of the rotor is in the first polarity, or when the AC power source is in the negative half-cycle and the magnetic field of the rotor is in the second polarity, The voltage applied on the first switch K1 and the second switch K2 by the AC power supply is applied to the first switch K1 and the second switch K2 for a short period of time after the AC power crosses the zero- Is not high enough to turn on the transistor K2. Therefore, when the AC power source is in the positive half-cycle and the magnetic field of the rotor is in the first polarity, or when the AC power source is in the negative half-cycle and the magnetic field of the rotor is in the second polarity, Lt; / RTI > have different current paths.

In at least one embodiment, when the AC power source operates in the positive half-cycle, the polarity of the magnetic field of the rotor is the predetermined first polarity, and the first switch K1 is turned on (the first switch K1 The second voltage drop circuit 320, the rectifier circuit 200, the switch control circuit 400, the second voltage drop circuit 320, the second voltage drop circuit 320, And the first current path of the switch circuit 600, that is, along the first current route, to the control terminal of the bidirectional AC switch 100; When the current flows through the collector and the base of the first switch K1, the first switch is turned on, and the current signal output by the AC power is supplied to the first voltage drop circuit 310, 1 current path sequentially, that is, along the second current route, to the control terminal of the bidirectional AC switch 100; The equivalent resistance of the first current route is higher than the equivalent resistance of the second current route because the equivalent resistance of the first current path and the second current path is smaller than that of the second voltage drop circuit 320. [

When the AC power source operates in the negative half-cycle, the polarity of the magnetic field of the rotor is the second polarity, and the second switch K2 does not satisfy the turn-on condition, the current signal output by the AC power source is bi- The second current path of the switch circuit 600, the switch control circuit 400, the rectifier circuit 200, the second voltage drop circuit 320 and the first voltage drop circuit 310 are connected to the control terminal of the switch 100, Flows sequentially, i. E. Along the third current route, to the first node A; When the current flows through the base and the emitter of the second switch K2, the second switch K2 is turned on, and the current signal output by the AC power source is supplied to the control terminal of the bidirectional AC switch 100, Flows sequentially through the second current path and the first voltage drop circuit 320 of the switching device 600, that is, to the first node along the fourth current path; The equivalent resistance of the third current route is higher than the equivalent resistance of the fourth current route because the equivalent resistance of the first current path and the second current path is smaller than that of the second voltage drop circuit 320. [

In the technical solution disclosed in the above embodiment of the present disclosure, when the drive current flows through the bidirectional ac switch, the switch control circuit 400 can be configured to have two operating states, a first state and a second state. If the AC power source AC is in the positive half-cycle, the magnetic field of the rotor of the motor is of the first polarity, and the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is not turned on The switch control circuit 400 operates in the first state. If the AC power source is in a negative half-cycle, the magnetic field of the rotor of the motor is at the second polarity, and the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is not turned on The switch control circuit 400 operates in the second state. The first state is that current flows from the high voltage output terminal of the rectifier circuit 200 to the control terminal of the switch circuit 600 through the switch control circuit 400. [ The second state is that current flows from the control terminal of the switch circuit 600 to the low voltage output terminal through the switch control circuit 400. [

When the AC power source is in the positive half-cycle and the external magnetic field is in the first polarity, or when the AC power source is in the negative half-cycle and the external magnetic field is in the second polarity, the current flows through the control terminal of the switch circuit 600 The situation is such that the current flows through the control terminal of the switch circuit 600 for the entire period of the two cases described above or the situation where the current flows through the control terminal of the switch circuit 600 during some of the two cases described above It should be noted that

Based on the above embodiment, the switch control circuit 400 may include the third switch K3 and the fourth switch K4. The third switch K3 is connected to the third current path and is configured to turn on or off the third current path based on the polarity of the magnetic field of the rotor and the polarity of the AC power supply. The third current path is arranged between the control terminal of the switch circuit 600 and the high voltage output terminal of the rectifier circuit 200. The fourth switch K4 is connected in the fourth current path and is configured to turn on or off the fourth current path based on the polarity of the magnetic field of the rotor and the polarity of the AC power supply, Voltage output terminal of the rectifier circuit 200 and the control terminal of the rectifier circuit 600. [

The third current path and the fourth current path are selectively turned on based on the polarity of the magnetic induction signal and the AC power supply so that the switch control circuit 400 switches between the first state and the second state. Preferably, the third switch K3 may be a triode and the fourth switch K4 may be a triode or a diode, the benefits of which are not limited in this disclosure and are context-dependent.

Specifically, in at least one embodiment, as shown in Fig. 3, the third switch K3 and the fourth switch K4 are a pair of complementary semiconductor switches. The third switch K3 is turned on at the low level and the fourth switch K4 is turned on at the high level. The third switch K3 is arranged in the third current path, and the fourth switch K4 is arranged in the fourth current path. Both control terminals of the third switch (K3) and the fourth switch (K4) are connected to the output terminal of the magnetic sensor (500). The current input terminal of the third switch K3 is connected to the high voltage output terminal of the rectifying circuit 200. The current output terminal of the fourth switch K4 is connected to the current input terminal of the fourth switch K4, The current output terminal of the fourth switch K4 is connected to the low voltage output terminal of the rectifying circuit 200. [ When the magnetic induction signal outputted by the output terminal of the magnetic sensor 500 is at the low level, the third switch K3 is turned on and the fourth switch K4 is turned off, Voltage output terminal of the switch circuit 600 to the control terminal of the switch circuit 600 through the third switch K3. The fourth switch K4 is turned on and the third switch K3 is turned off so that the load current is supplied to the switch circuit 600. In the case where the magnetic induction signal outputted by the output terminal of the magnetic sensor 500 is at the high level, Voltage output terminal of the rectifying circuit 200 through the fourth switch K4. In the example shown in Fig. 3, the third switch K3 is a p-channel metal-oxide semiconductor field effect transistor (P-type MOSFET) (N-type MOSFET). In another embodiment, it can be appreciated that the third switch K3 and the fourth switch K4 may be other types of semiconductor switches, such as a junction field effect transistor (JFET) or a metal semiconductor field effect transistor (MESFET) .

4, the third switch K3 is a switch that is turned on at a high level, the fourth switch K4 is a unidirectional diode, and the control of the third switch K3 is a unidirectional diode. In other embodiments of the present disclosure, And the cathode of the fourth switch (K4) are connected to the output terminal of the magnetic sensor (500). The current input terminal of the third switch K3 is connected to the high voltage output terminal of the rectifying circuit 200 and the anode of the fourth switch K4 is connected to the current output terminal of the third switch K3, And is connected to the control terminal. The third switch K3 is connected in the third current path, and the fourth switch K4 and the magnetic sensor 500 are connected in the fourth current path. The third switch K3 is turned on and the fourth switch K4 is turned off when the magnetic induction signal outputted by the output terminal of the magnetic sensor 500 is at the high level. Before the current path between the first terminal and the second terminal of the switch circuit 600 is turned on, the current of the motor drive circuit flows from the high voltage output terminal of the rectifying circuit 200 to the control terminal of the switch circuit 600, And flows through the switch K3. When the magnetic induction signal outputted by the output terminal of the magnetic sensor 500 is at the low level and before the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is turned on , The fourth switch K4 is turned on and the third switch K3 is turned off so that the current of the motor drive circuit flows from the control terminal of the bidirectional AC switch 100 to the low voltage output terminal of the rectifying circuit 200 4 switch K4 and the magnetic sensor 500 sequentially. In another embodiment of the present disclosure, it is understood that the third switch K3 and the fourth switch K4 may have different structures, which is not limited in this disclosure and depends on the specific situation.

In another embodiment of the present disclosure, the switch control circuit 400 includes a fifth current path in which current flows to the control terminal of the switch circuit 600, a sixth current path in which current flows from the control terminal of the switch circuit 600, And a switch connected in one of the fifth current path and the sixth current path. The switch is controlled by a magnetic induction signal to selectively turn on the fifth current path and the sixth current path. Preferably, the other of the fifth current path and the sixth current path of the switch control circuit 400 has no switch.

In a particular implementation, as shown in Figure 5A, the switch control circuit 400 includes a unidirectional switch D1 and resistor R1 connected in parallel. The current input terminal of the unidirectional switch D1 is connected to the output terminal of the magnetic sensor 500 and the current output terminal of the unidirectional switch D1 is connected to the control terminal of the switch circuit 600. [ The magnetic sensor 500 and the unidirectional switch D1 are connected in the current path from the high voltage output terminal of the rectifier circuit 200 to the control terminal of the switch circuit 600 and the magnetic sensor 500 and the resistor R1 Is arranged in the current path from the control terminal of the switch circuit 600 to the low voltage output terminal of the rectifier circuit 200. [ The unidirectional switch D1 is turned on when the magnetic induction signal is at high level and the current of the motor drive circuit is rectified before the current path between the first terminal and the second terminal of the switch circuit 600 is turned on The magnetic sensor 500 and the unidirectional switch D1 sequentially flow from the high voltage output terminal of the circuit 200 to the control terminal of the switch circuit 600. [ When the magnetic induction signal is at the low level, the unidirectional switch D1 is turned off before the current path between the first terminal and the second terminal of the switch circuit 600 is turned on, Flows through the resistor R1 and the magnetic sensor 500 sequentially from the control terminal of the rectifier circuit 600 to the low voltage output terminal of the rectifier circuit 200. [

5b, in at least one embodiment, the switch control circuit 400 includes diodes D2 and D3 connected in reverse-serial fashion between the output terminal of the magnetic sensor 500 and the control terminal of the bidirectional ac switch, A resistor R2 connected in parallel with the series connected diodes D2 and D3 and a resistor R3 connected between the common terminal of the diodes D2 and D3 and the high voltage output terminal of the rectifying circuit 200 . The cathode of the diode D2 is connected to the output terminal of the magnetic sensor 500. [ Diode D2 is controlled by a magnetic induction signal. When the magnetic induction signal is at the high level, the diode D2 is turned off, and before the current path between the first terminal and the second terminal of the switch circuit 600 is turned on, The resistor R3 and the diode D3 from the high voltage output terminal of the switch circuit 200 to the control terminal of the switch circuit 600 in sequence. Before the current path between the first terminal and the second terminal of the switch circuit 600 is turned on when the magnetic induction signal is at the low level, the current of the motor drive circuit is supplied from the control terminal of the switch circuit 600 to the rectification circuit And flows through the resistor R2 and the magnetic sensor 500 sequentially to the low voltage output terminal of the controller 200. [

1a or 1b, the input terminal of the switch control circuit 400 is connected to the high voltage output terminal of the rectifying circuit 200. In this embodiment, The output terminal of the switch control circuit 400 is connected to the control terminal of the switch circuit 600 and the power input terminal of the magnetic sensor 500 is directly or indirectly connected to the high voltage output terminal of the rectifying circuit 200, The ground terminal of the magnetic sensor 500 is connected to the low voltage output terminal of the rectifier circuit 200 and the output terminal of the magnetic sensor 500 is connected to the control terminal of the switch control circuit 400. When the AC power source is operated in the positive half-cycle and the polarity of the magnetic field of the rotor is the second polarity, the path is established between the power input terminal of the magnetic sensor 500 and the magnetic sensor 500 And the current of the motor driving circuit is connected to the second node B by the first voltage drop circuit 310, the second voltage drop circuit 320, the first input terminal of the rectifier circuit 200, The power input terminal of the magnetic sensor 500, the ground terminal of the magnetic sensor 500, the low voltage output terminal of the rectifier circuit 200, and the second input terminal of the rectifier circuit 200, ≪ / RTI > The path is formed between the power input terminal of the magnetic sensor 500 and the ground terminal of the magnetic sensor 500 when the AC power source operates in the negative half-cycle and the polarity of the magnetic field of the rotor is the first polarity, The current of the drive circuit is supplied to the first node A through the second input terminal of the rectifying circuit 200, the low voltage output terminal of the rectifier circuit 200, the ground terminal of the magnetic sensor 500, A high voltage output terminal of the rectifying circuit 200, a first input terminal of the rectifying circuit 200, a second voltage drop circuit 320 and a first voltage drop circuit 310 sequentially; The current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is turned on when the AC power source operates in the negative half-cycle and the polarity of the magnetic field of the rotor is of the second polarity The path is formed between the output terminal of the magnetic sensor 500 and the ground terminal of the magnetic sensor 500 and the current of the motor drive circuit is connected to the first node A through the bidirectional ac switch 100, The switch control circuit 400, the magnetic sensor 500, the rectifier circuit 200, the second voltage drop circuit 320 and the first voltage drop circuit 310 sequentially.

On the basis of this embodiment, in at least one embodiment of the present disclosure, when the AC power source operates in a positive half-cycle and the polarity of the magnetic field of the rotor is of the first polarity, The path is formed between the input terminal and the output terminal of the switch control circuit 400 and before the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is turned on, Circuit 400 and the output terminal of the switch control circuit 400. The current of the motor drive circuit is supplied to the second node B through the first voltage drop circuit 310 and the second voltage drop circuit 320, the rectifier circuit 200, the switch control circuit 400, the switch circuit 600, and the bidirectional AC switch 100 sequentially; The current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is turned on when the AC power source operates in the negative half-cycle and the polarity of the magnetic field of the rotor is of the second polarity A path is formed between the output terminal of the switch control circuit 400 and the control terminal of the switch control circuit 400. [

Based on this embodiment, in at least one embodiment of the present disclosure, the magnetic sensor 500 is powered by a first power source and the switch control circuit 400 is powered by a second power source different from the first power source Power is supplied. It should be noted that in the embodiments of the present disclosure, the second power source may be a power source having a variable amplitude or a DC power source having a constant amplitude. In the case where the second power source is a power source having a variable amplitude, a DC power source having a variable amplitude may be preferable, and this is not limited in the present disclosure and depends on a specific situation.

Based on the above embodiment, in at least one embodiment of this disclosure, the first power source is a DC power source having a constant amplitude, and provides a stable drive signal to the magnetic sensor 500 so that the magnetic sensor 500 operates stably .

Based on this embodiment, in at least one embodiment of the disclosure, the mean value of the output voltage of the first power source is less than the mean value of the output voltage of the second power source. If the magnetic sensor 500 is powered by a power source with low power consumption, it can reduce the power consumption of the motor drive circuit; It should be noted that, if the switch control circuit 400 is powered by a power supply having a high power consumption, the control terminal of the bidirectional AC switch 100 can obtain a high current so that the motor drive circuit can have a sufficient drive capacity .

Based on the above embodiment, in at least one embodiment of the present disclosure, the motor drive circuit further includes a voltage regulator circuit provided between the rectifier circuit 200 and the magnetic sensor 500. In the embodiment, the rectifier circuit 200 can be used as the second power source, and the voltage regulator circuit can be used as the first power source. The voltage regulator circuit is configured to regulate the first voltage output by the rectifier circuit 200 to a second voltage. The second voltage is the supply voltage for the magnetic sensor 500 and the first voltage is the supply voltage for the switch control circuit 400. The average value of the first voltage is larger than the average value of the second voltage, thereby reducing the power consumption of the motor drive circuit, and the motor drive circuit can have a sufficient drive capacity.

Based on this embodiment, in at least one embodiment of the present disclosure, the rectifier circuit 200 includes a full wave bridge rectifier and a voltage stabilization unit coupled to the output of the wave bridge rectifier. The wave bridge rectifier is configured to convert an alternating current output by the alternating current power supply (AC) into direct current, and the voltage stabilizing unit is configured to stabilize the direct current signal output by the full wave bridge rectifier within a predetermined value range.

Fig. 6 shows a specific circuit of the rectifier circuit 200. Fig. The voltage stabilizing unit includes a zener diode (DZ) connected between two output terminals of a full wave bridge rectifier. The wave bridge rectifier includes a first diode 211 and a second diode 212 connected in series and a third diode 213 and a fourth diode 214 connected in series. The common terminal of the first diode 211 and the second diode 212 is connected to the first voltage drop circuit 310. If the motor drive circuit includes the second voltage drop circuit 320, the common terminal of the third diode 213 and the fourth diode 214 is connected to the second voltage drop circuit 320; The common terminal of the third diode 213 and the fourth diode 214 is connected to the second node B if the motor drive circuit does not include the second voltage drop circuit 320. [

The input terminal of the first diode 211 is electrically connected to the input terminal of the third diode 213 to form the low voltage output terminal of the full wave bridge rectifier and the output terminal of the second diode 212 is connected to the high voltage And is electrically connected to the output terminal of the fourth diode 214 to form an output terminal. The Zener diode DZ is connected between the common terminal of the second diode 212 and the fourth diode 214 and the common terminal of the first diode 211 and the third diode 213. It should be noted that, in the present disclosed embodiment, the input terminal of the switch control circuit 400 is electrically connected to the high voltage output terminal of the full wave bridge rectifier.

In at least one embodiment of the present disclosure, as shown in FIG. 7, the magnetic sensor 500 includes a magnetic field sensing element 510 configured to detect an external magnetic field and convert the external magnetic field into an electrical signal, A signal processing unit 520 configured to amplify and descramble the received signal, and an analog-to-digital conversion unit 530 configured to convert the amplified and descrambled electrical signal into a magnetic induction signal. For applications that merely identify the polarity of the external magnetic field, the magnetic induction signal may be a switch-type digital signal. Preferably, the magnetic field sensing element 510 may be a hole plate.

In at least one embodiment of the present disclosure, one or more of the rectifier circuit, the switch control circuit, and the magnetic sensor may be integrated into the same integrated circuit.

The motor components are also provided in accordance with the embodiments of the present disclosure. The motor component includes a motor and the motor drive circuit described in any one of the above embodiments.

Based on this embodiment, in at least one embodiment of the present disclosure, the motor is a synchronous motor. It should be understood that the motor drive circuit according to the present disclosure is applicable to other types of permanent magnet motors, such as synchronous motors as well as brushless DC motors. As shown in Fig. 8, the synchronous motor includes a stator and a rotor 11 rotatable with respect to the stator. The stator includes a stator core (12) and a stator winding (16) wound on the stator core (12). The stator core 12 may be made of soft magnetic material such as pure iron, cast iron, cast steel, electric steel and silicon steel. The rotor 11 includes a permanent magnet and the rotor 11 operates at a constant rotational speed of 60 f / p revs / min under normal conditions when the stator winding 16 is connected in series with an AC power source , Where f is the frequency of the ac power source and p is the number of pairs of rotor poles. In an embodiment, the stator core 12 includes two poles 14 that are opposite to each other. Each pole contains a pole (15). The outer surface of the rotor 11 is opposite to the pole ring 15 and a substantially uniform gap is formed between the outer surface of the rotor 11 and the pole ring 15. In the present disclosure, substantially uniform pores are formed in most spaces between the stator and the rotor, and non-uniform pores are formed in a small portion of the space between the stator and the rotor. Preferably, the concave starting groove 17 is arranged in the poles 15 of the poles of the stator and the other part of the poles 15, except for the starting groove 17, is concentric with the rotor. With the above-described configuration, a non-uniform magnetic field can be formed, and the pole axis S1 of the rotor has an inclination angle with respect to the central axis S2 of the poles of the stator when the rotor is stopped, And may have a starting torque whenever electric power is supplied to the motor under the operation of the motor driving circuit. The pole axis S1 of the rotor refers to the boundary between the two poles of the rotor having different polarities and the center axis S2 of the pole 14 of the stator is the center of the two poles 14 of the stator Refers to a connecting line passing through. In an embodiment, each of the stator and rotor includes two magnetic poles. It should be appreciated that in more embodiments, the number of stator poles may not be equal to the number of stator poles, and that the rotor may have more stimulations such as four or six poles.

In the preferred embodiment of the present disclosure, the current input terminal of the third switch K3 in the switch control circuit 400 is connected to the high-voltage output terminal of the full-wave bridge rectifier, and the current output terminal of the fourth switch K4 is connected to the high- And is connected to the low voltage output terminal of the radio bridge rectifier through the magnetic sensor 500. When the signal output by the AC power source is in the positive half-cycle and the magnetic sensor 500 outputs the low level, the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 The third switch K3 is turned on and the fourth switch K4 is turned off in the switch control circuit 400 before the current path of the switch control circuit 400 is turned on. In this case, as shown in Fig. 9A, the drive current is supplied to the output terminal of the second diode 212 of the AC bridge rectifier, the output terminal of the switch control circuit 400 The switch circuit 600, and the bidirectional AC switch 100, and then flows again to the AC power source. The driving current flows through the first voltage drop circuit 310 and the second voltage drop circuit 320. [ After the current flow between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is turned on, as shown in Fig. 9B, the current flows through an AC power source, a motor, a first voltage drop circuit, The circuit 600 and the bidirectional AC switch 100, and then flows again to the AC power source. The drive current flows only through the first voltage drop circuit 310 and can be obtained by reducing the higher drive current by the equivalent resistance of the first voltage drop circuit 310. [ After the bidirectional AC switch 100 is turned on, the other circuit is short-circuited to stop the output. The bidirectional AC switch 100 can be turned on even if there is no driving current between the control terminal and the first anode if the load current flowing through the two anodes of the bidirectional AC switch 100 is sufficiently high It remains on. Before the current path between the first terminal and the second terminal of the switch circuit 600 is turned on when the signal output by the AC power supply is in the negative half-cycle and the magnetic sensor 500 outputs a high level, In the switch control circuit 400, the third switch K3 is turned off and the fourth switch K4 is turned on. As shown in Fig. 9C, the driving current flows from the AC power source and flows through the bidirectional ac switch 100, the switch circuit 600, the fourth switch K4 of the switch control circuit 400, the low- Passes through the first diode 211, the second voltage drop circuit 320, and the first voltage drop circuit 310, and then flows to the AC power supply again. After the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 is turned on, the current flows from the AC power supply, as shown in Fig. 9D, The switch circuit 600, and the first voltage drop circuit 310, and then flows again to the AC power source. Similarly, after the bidirectional ac switch 100 is turned on, the other circuit is short-circuited and the output stops, and the bidirectional ac switch 100 may remain in the turn-on state. When the signal output by the AC power supply is in the positive half-cycle and the magnetic sensor 500 outputs the high level or when the signal output by the AC power supply is in the negative half-cycle and the magnetic sensor 500 outputs the low level Either the third switch K3 or the fourth switch K4 of the switch control circuit 400 can not be turned on and the bidirectional AC switch 100 is turned off because there is no drive current. As shown in Figs. 9E and 9F, the current flows through the motor, rectifier circuit, and magnetic sensor and flows through the first voltage drop circuit 310 and the second voltage drop circuit 320, and the drive for the bidirectional ac switch If there is a current, the current is lower than the current flowing through the motor and the first voltage drop circuit 310. Therefore, the switch control circuit 400 can control the current flowing between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 in a predetermined manner, based on the polarity change of the AC power source and the magnetic induction signal, The path can be switched between the ON state and the OFF state, thereby increasing the driving current for the bidirectional AC switch 100. [

The motor driving circuit according to the present embodiment includes a bidirectional AC switch 100, a rectifier circuit 200, a first voltage drop circuit 310, a second voltage drop circuit 320, a switch control circuit 400 ), A magnetic sensor (500), and a switch circuit (600). The magnetic sensor 500 is configured to detect an external magnetic field and output a corresponding magnetic induction signal. The switch control circuit 400 turns on or off the current path between the first terminal of the switch circuit 600 and the second terminal of the switch circuit 600 based on the polarity of the magnetic induction signal and the AC power The bidirectional ac switch has a high drive current.

Motor parts according to embodiments of the present disclosure may be applied to devices such as pumps, fans, appliances, and vehicles, but are not limited thereto. The household appliances may be washing machines, dishwashers, smoke ejectors, exhaust fans, and the like.

It should be noted that although the embodiments of the present disclosure are exemplified by taking the motor drive circuit applied to the motor as an example, the application field of the motor drive circuit according to the embodiment of the present disclosure is not limited thereto.

The paragraphs of the present disclosure are described incrementally, with each paragraph mainly illustrating the differences from the other portions, and other paragraphs may be referred to in order to understand the same or similar portions.

It should be noted that the terms of the present disclosure, such as the first or second, are used only to distinguish one entity or action from another entity or action, rather than requiring or displaying any actual relationship or order between the entity or action Should be. Moreover, terms such as "comprise" or any other derivation are non-exclusive, so that a process, method, article or device that comprises a set of elements includes both elements, Includes unique elements or other elements not listed separately. Without further limitations, elements that are limited to the word "comprise " do not exclude the presence of other identical elements in the process, method, article, or device that comprises the element.

Because of the above detailed description of the disclosed embodiments, one of ordinary skill in the art may implement or use the present disclosure. Various changes to the embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the disclosure. Therefore, this disclosure is not limited to the embodiments disclosed herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

A motor drive circuit comprising:
A current switch connected in series with the motor at both terminals of the power supply, the current switch being connected between a first node and a second node;
A rectifier circuit having a first input terminal and a second input terminal; And
A first voltage drop circuit and a second voltage drop circuit connected in series between the first input terminal of the rectifying circuit and the first node and a second voltage drop circuit connected between the first voltage drop circuit and the second node, And the first voltage drop circuit is connected between the first node and the third node; And
A switch circuit connected between the third node and a control terminal of the current switch, the switch circuit comprising a first terminal, a second terminal, a control terminal, and a switch arranged between the first terminal and the second terminal -. ≪ / RTI > The method according to claim 1,
A magnetic sensor configured to sense a magnetic field of a rotor of the motor and output a corresponding magnetic induction signal; And
And a switch control circuit connected between a control terminal of the switch circuit and an output terminal of the magnetic sensor. The power supply according to claim 2, wherein the power source is an AC power source,
When the alternating-current power supply is in a positive half-cycle and the magnetic field of the rotor is at a predetermined first polarity or when the alternating-current power supply is in a negative half-cycle and the magnetic field of the rotor is opposite to the first polarity Turns on the current path between the first terminal and the second terminal of the switch circuit when in the polarity and turns on the current switch; And
Wherein the AC power is in a negative half-cycle and the rotor is at the first polarity, or when the AC power is in a positive half-cycle and the rotor is at the second polarity, And to turn off the current path between the second terminal and turn off the current switch. 4. The switch circuit of claim 3, wherein the switch circuit is provided with a first current path and a second current path that are selectively turned on, and wherein the first current path and the second current path are connected to the first terminal of the switch circuit, And the first current path is turned on when the AC power supply is in a positive half-cycle and the magnetic field of the rotor is in the first polarity, and the second current And the path is turned on when the AC power supply is in a negative half-cycle and the magnetic field of the rotor has the second polarity opposite to the first polarity. The motor drive circuit according to claim 1, wherein the power source is an AC power source,
When the AC power source operates in a positive half-cycle and the polarity of the magnetic field of the rotor is a predetermined first polarity or when the AC power source operates in a negative half-cycle and the polarity of the magnetic field of the rotor The current flows through the control terminal of the switch circuit after the current has passed through the first voltage drop circuit and the second voltage drop circuit and the first terminal of the switch circuit and the second terminal of the switch circuit Is configured to turn on the current path between the second terminal of the switch circuit and then to flow through the control terminal of the current switch after passing through the first voltage drop circuit and the current path. The motor drive circuit according to claim 1, wherein the equivalent resistance of the first voltage drop circuit is lower than the equivalent resistance of the second voltage drop circuit. The switch control circuit according to claim 2, wherein the switch control circuit turns on or off the current path between the first terminal of the switch circuit and the second terminal of the switch circuit based on the polarity of the power supply and the magnetic induction signal The motor drive circuit comprising: The power supply apparatus according to claim 2, wherein an input terminal of the switch control circuit is connected to a high-voltage output terminal of the rectifying circuit, an output terminal of the switch control circuit is connected to a control terminal of the switch circuit, And the output terminal of the magnetic sensor is connected to the control terminal of the switch control circuit. The motor drive circuit according to claim 1, . The magnetic sensor according to claim 8, wherein the power source is an AC power source, and the magnetic sensor is operable when the AC power source operates in a positive half-cycle, the polarity of a magnetic field of the rotor is a second polarity, - forming a path between the power input terminal of the magnetic sensor and the ground terminal of the magnetic sensor when the polarity of the magnetic field of the rotor is the first polarity, And a path between the control terminal of the magnetic sensor and the ground terminal of the magnetic sensor when the polarity of the magnetic field of the rotor is the second polarity. A motor component comprising a motor and a motor drive circuit according to any one of claims 1 to 9, wherein the motor includes a stator and a rotor, the stator comprising a stator core, a single-phase winding And the motor part.

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