KR20170017822A - Motor driving circuit and motor component - Google Patents

Abstract

Provided are a motor driving circuit and a motor component. The motor driving circuit comprises: a bidirectional AC switch which is a bidirectional AC switch directly connected to a motor at both ends of two terminals of an external AC power source, and is connected between a first node and a second node; a rectifier circuit which has a first input terminal and a second input terminal; a first voltage decreasing circuit which is connected between the first input terminal of the rectifier circuit and the first node; a switch control circuit which is connected between a control terminal of the bidirectional AC switch and an output terminal of the rectifier circuit; and a magnetic sensor which has an output terminal connected to the control terminal of the switch control circuit and is formed to sense the magnetic field of a rotor of the motor and output a magnetic induction signal corresponding to the magnetic field. Accordingly, the motor having the motor driving circuit starts to rotate in a predetermined direction whenever power is supplied to the rotor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor drive circuit,

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

Power is supplied to the stator coil of the synchronous motor by an AC power source. The AC power source generates a rotating magnetic field having a variable NS pole at the pole of the stator of the motor. The rotating magnetic field is driven to rotate the rotor and the rotational speed of the rotor depends on the frequency of the AC power source. In the process of starting a conventional synchronous motor, the stator electromagnets generate an alternating magnetic field, which results in a deflection oscillation of the rotor through the alternating magnetic field. If the amplitude of the deflection oscillation of the rotor increases, the rotation of the rotor in one direction can be accelerated quickly, eventually synchronizing with the alternating magnetic field of the stator.

According to embodiments of the present disclosure, a motor drive circuit, a motor component, and an application device may be provided so that the motor having the motor drive circuit can rotate in a predetermined direction at the start.

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

Thereby providing a motor drive circuit. The motor drive circuit comprises:

An AC switch connected in series with the motor at both terminals of the external AC power source, the AC switch being connected between the first node and the second node;

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

And a first voltage drop circuit connected between the first input terminal of the rectifying circuit and the first node.

Preferably, the motor drive circuit described above further includes a switch control circuit and a magnetic sensor, wherein the switch control circuit is connected between the control terminal of the AC switch and the output terminal of the rectifying circuit, And the magnetic sensor is configured to detect the magnetic field of the rotor of the motor and output a corresponding magnetic induction signal.

Preferably, in the motor drive circuit described above, the current flowing through the first voltage drop circuit when the drive current drives the AC switch is higher than the current flowing through the first voltage drop circuit when the AC switch is turned off.

Preferably, in the motor drive circuit described above, the current flowing through the motor when the drive current drives the AC switch is higher than the current flowing through the motor when the AC switch is turned off.

Preferably, the motor drive circuit described above further includes a second voltage drop circuit provided between the second input terminal of the rectifying circuit and the second node.

Preferably, in the motor drive circuit described above, the switch control circuit is configured to control the AC switch to be turned on or off based on the polarity of the magnetic induction signal and the AC power supply.

Preferably, in the motor drive circuit as described above, the switch control circuit is operable when the AC power source is in a positive half-cycle and the magnetic field of the rotor is in the first polarity, or alternatively when the AC power source is in a negative half- When the magnetic field is at the second polarity opposite to the first polarity, the AC switch is turned on and the AC power is in the negative half-cycle and the magnetic field of the rotor is in the first polarity, And the AC switch is turned off when the magnetic field of the rotor is at the second polarity.

Preferably, in the motor drive circuit described above, the switch control circuit switches between the first state and the second state when at least the AC switch is in the on-state;

The first state is a situation where current flows from the high voltage output terminal of the rectifying circuit to the control terminal of the AC switch through the switch control circuit; The second state is a state in which current flows from the control terminal of the AC switch to the low-voltage output terminal of the rectifying circuit through the switch control circuit.

Preferably, in the above-described motor drive circuit, the operation state of the switch control circuit is a first state when the polarity of the magnetic field of the rotor is the first polarity and the AC power source operates in the positive half- Is a second state when the polarity of the magnetic field of the rotor is a second polarity opposite to the first polarity and the AC power source operates in a negative half-cycle.

Preferably, in the motor drive circuit described above, the switch control circuit includes a first switch and a second switch;

The first switch is connected in the first current path, the first path is provided between the control terminal of the AC switch and the high voltage output terminal of the rectifying circuit;

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

Preferably, in the motor drive circuit described above, the power input terminal of the magnetic sensor is connected to the high voltage output terminal of the rectifying circuit, and the ground terminal of the magnetic sensor is connected to 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 a control terminal of the AC switch; a second current path through which current flows from a control terminal of the AC switch; And a switch coupled in one of the second current paths, wherein the switch is controlled by a magnetic induction signal to selectively turn on 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 AC switch;

The power input terminal of the magnetic sensor is connected to the high voltage output terminal of the rectifying 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, when the AC power source operates in the positive half-cycle and the polarity of the magnetic field of the rotor is the second polarity, or when the AC power source operates in the negative half- When the polarity is the first polarity, a path is formed between the power input terminal of the magnetic sensor and the ground terminal of the magnetic sensor;

A path is formed between the output terminal of the magnetic sensor and the ground terminal of the magnetic sensor when the AC power source operates in the negative half-cycle and the polarity of the magnetic field of the rotor is the second polarity.

Preferably, in the motor drive circuit described above, the switch control circuit is configured as follows:

The path is formed between the input terminal of the switch control circuit and the output terminal of the switch control circuit when the AC power source operates in the positive half-cycle and the polarity of the magnetic field of the rotor is the first polarity;

When the AC power source operates in a negative half-cycle and the polarity of the magnetic field of the rotor is the second polarity, a path is formed between the output terminal of the switch control circuit and the control terminal of the switch control circuit.

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

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

Motor components are provided. The motor component includes a motor and a motor drive circuit as described in any one of the above embodiments.

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

On the basis of the above technical solution, in the motor drive circuit according to the embodiment of the present disclosure, the switch control circuit obtains, through the control terminal, a magnetic induction signal of the polarity of the magnetic field of the rotor of the motor detected by the magnetic sensor, Directional AC switch is turned on or off based on at least a magnetic induction signal so that the motor having the motor driving circuit rotates in a predetermined direction each time electric power is supplied to the rotor.

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 motor drive circuit according to another embodiment of the present disclosure.
3 is a structural diagram of a switch control circuit according to an embodiment of the present disclosure.
4 is a structural diagram of a switch control circuit according to another embodiment of the present disclosure.
5A is a structural diagram of a switch control circuit according to another embodiment of the present disclosure.
5B is a structural diagram of a switch control circuit according to another embodiment of the present disclosure.
6 is a structural diagram of a rectifying circuit in a motor driving circuit according to the embodiment of the present disclosure.
7 is a structural view of a magnetic sensor in a motor drive circuit according to an embodiment of the present disclosure.
8 is a structural view of a motor in a motor component according to an embodiment of the present disclosure;
9A-9D are schematic diagrams of the current paths of the motor drive circuit for different polarities of the magnetic field and different polarities of the power source according to the 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 first voltage drop circuit 300, a switch control circuit 400, and a magnetic sensor 500.

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 rectifier circuit 200 includes a first input terminal and a second input terminal, and the rectifier circuit 200 is configured to convert the alternating current output from the alternating current power source AC into a direct current and output a direct current.

The first voltage drop circuit 300 is connected between the first input terminal of the rectifier circuit 200 and the first node A. [ The type of the first voltage drop circuit 300 may vary according to specific requirements. For example, the first voltage drop circuit 300 may include at least a first voltage drop resistor RA.

The switch control circuit 400 is connected between the control terminal of the bidirectional AC switch 100 and the output terminal of the rectifier circuit 200.

The output terminal of the magnetic sensor 500 is connected to the control terminal of the switch control circuit 400. The magnetic sensor 500 detects the magnetic field of the rotor of the motor and outputs a corresponding magnetic induction signal. Then, based on the magnetic induction signal and the current polarity of the AC power source AC, the magnetic sensor 500 detects the operation state of the switch control circuit 400 . The magnetic sensor 500 is positioned near the rotor of the motor M and senses the variation of the magnetic field of the rotor.

In the technical solution disclosed in the above embodiment of the present disclosure, the switch control circuit 400 controls the state of the bidirectional AC switch 100 based on at least a magnetic induction signal. The control rule can be set according to specific requirements so that the starting direction of the motor can be controlled by the magnetic induction signal and the AC power source AC so that the rotor of the motor M rotates in the same direction every time the motor starts .

It will be appreciated that the bidirectional ac switch 100 may be implemented with other suitable types of switches. For example, bidirectional ac switch 100 may include two silicon-controlled rectifiers connected in reverse-parallel to each other and may have corresponding control circuitry, so that the two silicon-controlled rectifiers are connected to switch control circuit 400 In a predetermined manner via a control circuit. Alternatively, bidirectional ac switch 100 may include an electronic switch, which allows current to flow in two directions, which may include 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 a photocoupler. 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.

In at least one embodiment of the present disclosure, the drive current of the control terminal of the bi-directional AC switch 100 is controlled by the voltage drop produced by the first voltage drop circuit 300. In at least one embodiment, a first voltage drop circuit 300 is provided between the first input terminal of the rectifier circuit 200 and the first node A, and the voltage drop required by the motor drive circuit is entirely the first Is provided by a voltage drop circuit (300). For applications requiring a high voltage drop, the first voltage drop circuit 300 has a very large equivalent resistance. When the motor driving circuit is in operation, the driving current flowing through the bidirectional AC switch 100 will flow through the first voltage drop circuit 300. Therefore, the driving current of the control terminal of the bidirectional AC switch 100 will be very small. That is, in order to select the bidirectional AC switch 100, a bidirectional AC switch type having a very small driving current must be selected. However, a bidirectional AC switch that meets the above conditions has a very large manufacturing process requirement, which makes it expensive to manufacture a bidirectional AC switch that can accommodate a low drive current. In other arrangements, bidirectional ac switches with low drive currents can correspondingly tolerate low load currents and can not meet the requirements for the application of bidirectional ac switches with large load currents. In view of this, the motor drive circuit described above is configured as follows: when the bidirectional ac switch 100 has a drive current, the current flowing through the first voltage drop circuit 300 is supplied to the bidirectional ac switch 100 Is greater than the current flowing through the first voltage drop circuit (300) when it is turned off; The current flowing through the motor M is larger than the current flowing through the motor M when the bidirectional AC switch 100 is turned off when the AC switch 100 and / or the bidirectional AC switch 100 has the driving current. In the specific implementation of the above-described configuration solution provided in accordance with the present disclosure, as shown in FIG. 2, the motor drive circuit includes a second voltage drop (not shown) provided between the second input terminal of the rectifier circuit 200 and the second node Circuit 600 as shown in FIG. Similar to the first voltage drop circuit 300, the second voltage drop circuit 600 may include at least a second voltage drop resistor RB. In this case, the equivalent resistance of the first voltage drop circuit 300 can be appropriately reduced, so that the driving current of the bidirectional AC switch 100 can be increased. Therefore, in order to select the bidirectional ac switch 100, a bidirectional ac switch having a high drive current and a high load current can be selected, thereby reducing the circuit design cost. The equivalent resistance values of the first voltage drop circuit 300 and the second voltage drop circuit 600 are set such that the first voltage drop circuit 300 and the second voltage drop circuit 600 have appropriate voltage drop As long as it is capable of providing the necessary information.

In the technical solution disclosed in the above embodiment of the present disclosure, the switch control circuit 400 is configured to control the bi-directional AC switch 100 to be turned on or off based on the polarity of the magnetic induction signal and the AC power source do. Specifically, when the alternating-current power supply AC is in the positive half-cycle and the magnetic field of the rotor of the motor is at the first polarity, or when the alternating-current power source is in the negative half-cycle and the magnetic field of the rotor is opposite to the first polarity In the case of the second polarity, the bidirectional ac switch is turned on, the ac power is in the negative half-cycle and the rotor is in the first polarity, or alternating current is in the positive half- If yes, the bidirectional ac switch is turned off. Which polarity of the magnetic field is the first polarity and which polarity of the magnetic field is the second polarity can be determined based on the starting direction of the rotor as necessary.

In the solution disclosed in the above embodiment of the present disclosure, the switch control circuit 400 may be configured to operate in two states, a first state and a second state. When the bidirectional ac switch 100 is turned on, the switch control circuit 400 switches between at least a first state and a second state. The first state is a state in which current flows from the high voltage output terminal of the rectifier circuit 200 to the control terminal of the bidirectional AC switch 100 through the switch control circuit 400; The second state is a state in which the current flows from the control terminal of the bidirectional AC switch 100 to the low voltage output terminal of the rectifier circuit 200 through the switch control circuit 400. [ Specifically, the switch control circuit 400 switches to a different state based on different turn-on conditions of the bidirectional AC switch 100. [ For example, when the bidirectional ac switch 100 is turned on when the polarity of the magnetic field of the rotor is of the first polarity and the ac power source operates in the positive half-cycle, the operational state of the switch control circuit 400 is the first state ; When the bidirectional ac switch 100 is turned on when the polarity of the magnetic field of the rotor is of the second polarity opposite to the first polarity and the ac power source operates in the negative half-cycle, the operating state of the switch control circuit is in the second state .

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 bidirectional AC switch 100 The situation may be such that the current flows through the control terminal of the bidirectional ac switch 100 during the entire period of the two cases described above (the first state and the second state) Directional AC switch 100 during a partial period of time.

In at least one embodiment, when the switch control circuit 400 switches between the first state and the second state, the switch control circuit 400 may switch to another state immediately after one state ends , And the switch control circuit 400 switches to another state after a specific time interval when one state ends. In at least one embodiment, there is no current interaction between the switch control circuit 400 and the bidirectional AC switch 100 in the time interval between the two states.

The switch control circuit 400 may include a first switch K1 and a second switch K2. The first switch K1 is connected in the first current path and is configured to control the first current path to be turned on or off based on the polarity of the magnetic field of the rotor and the polarity of the AC power source. The first current path is provided between the control terminal of the bidirectional AC switch 100 and the high voltage output terminal of the rectifier circuit 200. The second switch K2 is connected in the second current path and is configured to control the second current path to be turned on or off based on the polarity of the magnetic field of the rotor and the polarity of the AC power source. The second current path is provided between the control terminal of the bidirectional AC switch 100 and the low voltage output terminal of the rectifier circuit 200.

The first current path and the second current path are alternately selectively turned on under the control of the magnetic induction signal so that the switch control circuit 400 switches between the first state and the second state. Preferably, the first switch K1 may be a triode and the second switch K2 may be a triode or a diode, the advantages of which are not limited in this disclosure and are context-dependent.

Specifically, in the embodiment of the present disclosure, as shown in Fig. 3, the first switch K1 and the second switch K2 are pairs of complementary semiconductor switches. The first switch K1 is turned on at the low level and the second switch K2 is turned on at the high level. The first switch K1 is provided in the first current path and the second switch K2 is provided in the second current path. Both control terminals of the first switch K1 and the second switch K2 are connected to the output terminal of the magnetic sensor 500. [ The current input terminal of the first switch K1 is connected to the high voltage output terminal of the rectifying circuit 200. The current output terminal of the first switch K1 is connected to the current input terminal of the second switch K2, 2 The current output terminal of the switch K2 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 first switch K1 is turned on and the second switch K2 is turned off, Way AC switch 100 to the control terminal of the bidirectional AC switch 100 through the first switch K1. If the magnetic induction signal output by the output terminal of the magnetic sensor 500 is at a high level, the second switch K2 is turned on and the first switch K1 is turned off, To the low voltage output terminal of the rectifier circuit 200 through the second switch K2. Channel metal-oxide semiconductor field effect transistor (P-type MOSFET), and the second switch K2 is a p-channel metal-oxide semiconductor field effect transistor (N-channel MOSFET). In at least one embodiment, the first switch K1 is a p- -Type MOSFET). In another embodiment, the first switch K1 and the second switch K2 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 first switch K1 is a switch that is turned on at a high level, the second switch K2 is a unidirectional diode, and the control of the first switch K1 is a unidirectional diode. In other embodiments of the present disclosure, And the cathode of the second switch (K2) are connected to the output terminal of the magnetic sensor (500). The current input terminal of the first switch K1 is connected to the high voltage output terminal of the rectifier circuit 200. The anode of the second switch K2 and the current output terminal of the first switch K1 are connected to the bidirectional AC switch 100, As shown in FIG. The first switch K1 is connected in the first current path and the second switch K2 and the magnetic sensor 500 are connected in the second current path. When the magnetic induction signal outputted by the output terminal of the magnetic sensor 500 is at the high level, the first switch K1 is turned on, the second switch K2 is turned off, and the current of the motor driving circuit is rectified And flows from the high voltage output terminal of the circuit 200 to the control terminal of the bidirectional AC switch 100 through the first switch K1. When the magnetic induction signal outputted by the output terminal of the magnetic sensor 500 is at the low level, the second switch K2 is turned on, the first switch K1 is turned off, Flows through the second switch (K2) and the magnetic sensor (500) sequentially from the control terminal of the bidirectional AC switch (100) to the low voltage output terminal of the rectifier circuit (200). In another embodiment of the present disclosure, the first switch K1 and the second switch K2 have different structures, which is not limited in this disclosure and depends on the particular situation.

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

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 bidirectional AC switch 100. [ 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 bidirectional AC switch 100 and the magnetic sensor 500 and the resistor R1 is provided in the current path through which the current flows from the control terminal of the bidirectional AC switch 100 to the low voltage output terminal of the rectifier circuit 200. [ Directional switch D1 is turned on when the magnetic induction signal is at a high level and the current in the motor drive circuit is supplied from the high voltage output terminal of the rectifier circuit 200 to the control terminal of the bidirectional AC switch 100 via the magnetic sensor 500 And the unidirectional switch D1 sequentially. When the magnetic induction signal is at the low level, the unidirectional switch D1 is turned off, and 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 rectifier circuit 200 through the resistor R1 And the magnetic sensor 500 sequentially.

5b, the switch control circuit 400 includes diodes D2 and D3 connected in reverse-serial manner 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 rectifier 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 a high level, the diode D2 is turned off, and the current of the motor driving circuit flows from the high voltage output terminal of the rectifier circuit 200 to the control terminal of the bidirectional AC switch 100, And the diode D3 sequentially. The current of the motor drive circuit is sequentially transmitted from the control terminal of the bidirectional AC switch 100 to the low voltage output terminal of the rectifier circuit 200 through the resistor R2 and the magnetic sensor 500 in sequence when the magnetic induction signal is at the low level Flows.

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, and the input terminal of the switch control circuit 400 is connected to the output terminal of the rectifying circuit 200. In this embodiment, The output terminal of the control circuit 400 is connected to the control terminal of the bidirectional AC switch 100. The power input terminal of the magnetic sensor 500 is directly or indirectly connected to the high voltage output terminal of the rectifier circuit 200. The ground terminal of the magnetic sensor 500 is connected to the low voltage output terminal of the rectifier circuit 200, The output terminal of the switch 500 is connected to the control terminal of the switch control circuit 400. The output of the output terminal of the magnetic sensor 500 is connected to the first current path and the output terminal of the magnetic sensor 500. In this case, The path is formed between the power input 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 B by the first A voltage drop circuit 300, a first input terminal of the rectifier circuit 200, a high voltage output terminal of the rectifier circuit 200, a power input terminal of the magnetic sensor 500, a ground terminal of the magnetic sensor 500, 200, a second input terminal of the rectifying circuit 200, and a second voltage drop circuit 600 (when a second voltage drop circuit is present) in sequence; The output of the output terminal of the magnetic sensor 500 prevents the formation of the first current path and the second current path, and the output of the output terminal of the magnetic sensor 500 prevents the formation of the first current path and the second current path 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 path is formed between the power input 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 second voltage drop circuit 600 The second input terminal of the rectifying circuit 200, the low voltage output terminal of the rectifying circuit 200, the ground terminal of the magnetic sensor 500, the power input terminal of the magnetic sensor 500, The high voltage output terminal of the rectifier circuit 200, the first input terminal of the rectifier circuit 200, and the first voltage drop circuit 300 sequentially; In the case where the AC power source operates in the negative half-cycle and the polarity of the magnetic field of the rotor is 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, Directional AC switch 100, the output terminal of the switch control circuit 400, the switch control circuit 400, and the output terminal of the bidirectional AC switch 100, The output terminal of the magnetic sensor 500, the ground terminal of the magnetic sensor 500, the low voltage output terminal of the rectifier circuit 200, the first input terminal of the rectifier circuit 200, and the first voltage drop circuit 300 ) Sequentially. The "formed path" between the two terminals described in this disclosure refers to the current flowing through the two terminals, which should not be narrowly interpreted as the two terminals being short-circuited.

In at least one embodiment, when the AC power source operates in a positive half-cycle and the polarity of the magnetic field of the rotor is the first polarity, a path is established between the input terminal of the switch control circuit 400 and the output 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 300, the first input terminal of the rectifier circuit 200, the high voltage output of the rectifier circuit 200 Directional AC switch 100 and the first terminal of the bidirectional AC switch 100, the input terminal of the switch control circuit 400, the output terminal of the switch control terminal 400, the control terminal of the bidirectional AC switch 100, A path is formed between the output terminal of the switch control circuit 400 and the control terminal of the switch control circuit 400 when the AC power source operates in a negative half-cycle and the polarity of the magnetic field of the rotor is the second polarity.

In at least one embodiment, 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. 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.

In at least one embodiment, the first power source is a DC power source having a constant amplitude, and provides a stable driving signal to the magnetic sensor 500 to allow the magnetic sensor 500 to operate stably.

In at least one embodiment, 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 .

In at least one embodiment, the motor drive circuit further comprises 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.

In at least one embodiment, 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. A common terminal of the first diode 211 and the second diode 212 is connected to the first voltage drop circuit 300. If the motor drive circuit includes the second voltage drop circuit 600, the common terminal of the third diode 213 and the fourth diode 214 is connected to the second voltage drop circuit 600; 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 600. [

The low voltage output terminal of the full wave bridge rectifier is formed by electrically connecting the input terminal of the first diode 211 to the input terminal of the third diode 213 and the high voltage output terminal of the wave bridge rectifier is connected to the input terminal of the second diode 212 And electrically connecting the output terminal to the output terminal of the fourth diode 214. [ 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 embodiment of the present disclosure, the input terminal of the switch control circuit 400 is electrically connected to the high voltage output terminal of the full wave bridge rectifier.

7, the magnetic sensor 500 includes a magnetic field detecting element 510 configured to detect an external magnetic field and convert an external magnetic field into an electric signal, A signal processing unit 520 configured to be scrambled, 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 output control circuit and the Hall sensor may be integrated in 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 a motor drive circuit as described in any one of the above embodiments.

In at least one embodiment, 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 at least one embodiment, the current input terminal of the first switch K1 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 second switch K2 is connected to the high- Voltage output terminal of the magnetic sensor 500 via 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 a low level, the first switch K1 is turned on in the switch control circuit 400, (K2) is turned off. 9A, the driving current is supplied to the bidirectional AC switch 100 through the AC power source, the motor, the first voltage drop circuit, the output terminal of the second diode 212 of the radiofrequency bridge rectifier, 400, and then flows to the alternating current power supply again. The drive current flows only through the first voltage drop circuit 300 and a higher drive current can be obtained by reducing the equivalent resistance of the first voltage drop circuit 300. [ 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. 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 first switch K1 is turned off and the second switch K2 ) Is turned on. 9B, the driving current flows from the AC power source, and the bidirectional AC switch 100, the second switch K2 of the switch control circuit 400, the low voltage output terminal of the radiofrequency bridge rectifier, and the first diode 211 And the first voltage drop circuit 300, and then flows to the alternating current power supply again. Similarly, after the bidirectional ac switch 100 is turned on, the bidirectional ac switch 100 may remain in the on-state and the other circuit is short-circuited and the output is stopped. 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 first switch K1 or the second switch K2 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. The current flows through the motor, the rectifier circuit 200, the magnetic sensor 500, the first voltage drop circuit 300 and the second voltage drop circuit 600 as shown in Figs. 9C and 9D, When there is a drive current for the switch, the current is lower than the current flowing through the motor and the first voltage drop circuit 300. Therefore, the switch control circuit 400 can switch the bi-directional AC switch 100 between the ON state and the OFF state in a predetermined manner based on the polarity change of the AC power source and the magnetic induction signal, 16 so that the variable magnetic field generated by the stator is driven so as to rotate in a single direction in accordance with the position of the magnetic field of the rotor so that the rotor rotates every time power is supplied to the motor It rotates in a fixed direction.

Consequently, the motor drive circuit according to the embodiment of the present disclosure includes the bidirectional AC switch 100, the rectifier circuit 200, the first voltage drop circuit 300, the switch control circuit 400, the magnetic sensor 500, 2 voltage drop 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 100 is configured to switch the switch control circuit 400 between at least a first state and a second state based at least on the magnetic induction signal so that the rotor of the motor component's motor will start Each time it rotates in the same direction.

Motor components in accordance with embodiments of the present disclosure may be applied to, but are not limited to, devices such as pumps, fans, appliances, and vehicles. 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:
An AC switch connected in series with the motor at two terminals of the external AC power source, the AC switch being connected between the first node and the second node;
A rectifier circuit having a first input terminal and a second input terminal; And
And a first voltage drop circuit coupled between the first input terminal of the rectifying circuit and the first node. The switch control circuit according to claim 1, further comprising a switch control circuit and a magnetic sensor, wherein the switch control circuit is connected between a control terminal of the AC switch and an output terminal of the rectifying circuit, And the magnetic sensor is configured to detect a magnetic field of a rotor of the motor and output a corresponding magnetic induction signal. The motor drive circuit according to claim 1, wherein the current flowing through the motor when the drive current drives the AC switch is higher than the current flowing through the motor when the AC switch is turned off. The motor drive circuit according to claim 1, further comprising a second voltage drop circuit provided between a second input terminal of the rectifying circuit and the second node. The motor drive circuit according to claim 1, wherein the switch control circuit is configured to control the AC switch to be turned on or off based on the polarity of the magnetic induction signal and the AC power. The switch according to claim 1, wherein the switch control circuit switches between a first state and a second state when at least the AC switch is in the on-state;
The first state is a situation where a current flows from the high voltage output terminal of the rectifying circuit to the control terminal of the AC switch through the switch control circuit; Wherein the second state is a situation in which a current flows from the control terminal of the AC switch to the low voltage output terminal of the rectifying circuit through the switch control circuit. 7. The switching control circuit according to claim 6, wherein the operation state of the switch control circuit is a first state when the polarity of the magnetic field of the rotor is the first polarity and the AC power source operates in the positive half- State is a second state when the polarity of the magnetic field of the rotor is a second polarity opposite to the first polarity and the ac power source operates in a negative half-cycle. An apparatus according to claim 1, wherein an input terminal of said switch control circuit is connected to a high voltage output terminal of said rectifying circuit, and an output terminal of said switch control circuit is connected to a control terminal of said AC switch;
Wherein a power input terminal of the magnetic sensor is connected to a high voltage output terminal of the rectifying circuit, a ground terminal of the magnetic sensor is connected to a low voltage output terminal of the rectifying circuit, and an output terminal of the magnetic sensor is controlled by the switch control circuit Terminal of the motor drive circuit. 9. The method of claim 8 wherein the AC power source operates in a positive half-cycle and the polarity of the magnetic field of the rotor is of a second polarity, or when the AC power source operates in a negative half- In the case of the first polarity, a path is formed between the power input terminal of the magnetic sensor and the ground terminal of the magnetic sensor;
Wherein a path is formed between an output terminal of the magnetic sensor and a ground terminal of the magnetic sensor when the AC power source operates in a negative half-cycle and the polarity of the magnetic field of the rotor is a second polarity. 1. A motor component comprising a motor and the motor drive circuit according to any one of claims 1 to 9,
The motor comprising a stator and a rotor, the stator comprising a stator core and a single-phase winding wound on the stator core.

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