Motor controller with novel gear detection circuit and ECM motor

Abstract

The utility model discloses a motor controller with a novel gear detection circuit and an ECM motor, comprising a rectification circuit, a DC-DC conversion power supply circuit, a motor control driving module and a plurality of gear detection circuits, and also comprising a voltage division circuit which is connected with the rectification circuit, the DC-DC conversion power supply circuit, the motor control driving module and the plurality of gear detection circuits, two ends of the voltage division circuit are respectively connected with a null line N and a live wire L. One input end of the optical coupler isolation detection circuit is connected with the null line N or the live wire L to detect a signal source, and the other input end of the optical coupler isolation detection circuit is connected with a voltage division common end CON in the middle of the voltage division circuit. And the output ends of the optical coupler isolation detection circuits are connected with the motor control driving module. The problem of wrong wiring is not worried about, and the gear detection circuit has a signal isolation function and is not easily interfered.

Description

Technical Field

[0001] The utility model relates to a motor controller with a novel gear position detection circuit and an ECM motor. Background Art

[0002] ECM motors are widely used. Many fields require ECM motors to have multiple gear speeds or gear torques in order to better cooperate with the use of application equipment. There are similar application requirements in fans, air conditioners, and stoves. Traditional multi-gear ECN motors have multiple gear input lines and multiple gear detection circuits. Each gear input line detects the power-on signal through a gear detection circuit. Each gear detection circuit inputs the power-on signal of the corresponding gear input line to the microprocessor. The microprocessor selects the corresponding gear speed or gear torque according to the power-on signals of the multiple gear input lines. Figure 1 , Figure 2 The ECM motor with multiple gears comprises a motor 1 and a motor controller 2. The motor controller 2 comprises a control box and a control circuit board installed in the control box. The control circuit board is integrated with a motor control drive module. The motor control drive module comprises a microprocessor (a single chip microcomputer or a digital signal processor DSP), an inverter circuit, five gear detection circuits, a rotor position detection circuit and a power supply part. The power supply part is connected to an external AC power input. The five gear detection circuits are respectively connected to five gear input lines (N1, N2, N3, N4, N5). At least one of the five gear input lines is selected to be in a conducting state, and the other ones are selected to be in a disconnected state without power. It also comprises a first AC input lead N, a second AC input lead L, a common lead COM, and a ground lead E. Each gear input line is respectively connected to a first input end of an optocoupler conversion circuit. The second input ends of the optocoupler conversion circuits are connected in parallel and are respectively connected to the common lead COM. The output end of the optocoupler conversion circuit is connected to the input end of the microprocessor. The signal source is connected by opening and closing the switch K. The gear detection circuit requires the live wire L and the neutral wire N as its input signal source.

[0003] Figure 2 In the circuit, the live wire L and the neutral wire N of the AC input are simultaneously input to both ends of the optocoupler IC1 to complete the switching. The L wire cannot be connected incorrectly, otherwise the circuit cannot work. The input cannot be instantly powered off or the voltage fluctuation is larger than the threshold current value of the optocoupler IC1, otherwise it cannot close normally. IC1 is a photocoupler, which relatively extends the mechanical life. The gear detection circuit requires the live wire L and the neutral wire N as its input signal source, so it is easy to connect the wires incorrectly, resulting in the circuit not working and inconvenient to use and install.

[0004] In view of the problems existing in the above-mentioned prior art, the patent number is CN202121317616, and the name is: the utility model of the gear detection circuit and motor controller for motor gear switching control solves the above problems better, that is, the signal input end of the gear detection circuit can be connected to the live wire L or the neutral wire N, without worrying about the problem of wrong connection and inconvenient use and installation. However, the patent still has some defects: the input signal of the gear detection circuit is not isolated and is easily interfered. Summary of the invention

[0005] The purpose of the utility model is to provide a motor controller and an ECM motor with a novel gear detection circuit. The signal input end of the gear detection circuit can be connected to the live wire L or the neutral wire N, and there is no need to worry about the problem of wrong connection. The gear detection circuit has signal isolation and is not easily interfered.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A motor controller with a novel gear detection circuit comprises a rectifier circuit, a DC-DC conversion power supply circuit, a motor control drive module and a plurality of gear detection circuits, wherein a neutral line N and a live line L of a mains power input are used as input ends of the rectifier circuit, an output end of the rectifier circuit is connected to an input end of a DC-DC conversion power supply circuit, an output end of the DC-DC conversion power supply circuit supplies power to the motor control drive module, and the gear detection circuit adopts an optocoupler isolation detection circuit, characterized in that: it also comprises a voltage divider circuit, two ends of the voltage divider circuit are respectively connected to the neutral line N and the live line L, an input end of the optocoupler isolation detection circuit is connected to the neutral line N or the live line L to detect a signal source, another input end of the optocoupler isolation detection circuit is connected to a voltage divider common end CON in the middle of the voltage divider circuit, and output ends of the plurality of optocoupler isolation detection circuits are connected to the motor control drive module.

[0008] The voltage divider circuit includes a resistor R11 and a resistor R12. The resistors R11 and R12 are connected in series, and both ends are connected to the neutral line N or the live line L respectively. A voltage divider common terminal CON is drawn between the resistors R11 and R12.

[0009] The above-mentioned optocoupler isolation detection circuit includes an optocoupler IC1, a resistor R10, a resistor R14 and a capacitor C10.

[0010] The above-mentioned motor control drive module includes a microprocessor MCU, an inverter circuit and a rotor position detection circuit.

[0011] An ECM motor includes a motor and a motor controller. The motor includes a stator assembly and a rotor assembly. The motor controller is characterized in that the motor controller adopts the motor controller with the novel gear detection circuit described above.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The gear detection circuit adopts an optocoupler isolation detection circuit. One input end of the optocoupler isolation detection circuit is connected to the neutral line N or the live line L to detect the signal source. Therefore, there is no need to worry about the problem of wrong connection. The gear detection circuit has signal isolation and is not easily interfered.

[0014] 2. Other advantages of the utility model are described in detail in the embodiment section of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of a multi-gear ECM motor in the prior art;

[0016] Figure 2 It is a circuit block diagram of a multi-gear ECM motor in the prior art;

[0017] Figure 3 A circuit block diagram of a motor controller for an ECM motor provided by the utility model;

[0018] Figure 4 for Figure 3 The corresponding part of the circuit diagram;

[0019] Figure 5 for Figure 3 The corresponding other part of the circuit diagram. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1:

[0022] like Figures 3 to 5As shown, this embodiment provides a motor controller with a novel gear detection circuit, including a rectifier circuit, a DC-DC conversion power supply circuit, a motor control drive module and a plurality of gear detection circuits, the neutral line N and the live line L of the AC power input are used as the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the input end of the DC-DC conversion power supply circuit, the output end of the DC-DC conversion power supply circuit supplies power to the motor control drive module, the gear detection circuit adopts an optocoupler isolation detection circuit, characterized in that: it also includes a voltage divider circuit, the two ends of the voltage divider circuit are respectively connected to the neutral line N and the live line L, one input end of the optocoupler isolation detection circuit is connected to the neutral line N or the live line L to detect the signal source, the other input end of the optocoupler isolation detection circuit is connected to the middle voltage divider common end CON of the voltage divider circuit, and the output ends of the plurality of optocoupler isolation detection circuits are connected to the motor control drive module.

[0023] The voltage divider circuit comprises a resistor R11 and a resistor R12. The resistors R11 and R12 are connected in series, and both ends are connected to the neutral line N or the live line L respectively. A voltage divider common terminal CON is drawn between the resistors R11 and R12. The circuit structure is simple.

[0024] The above-mentioned optocoupler isolation detection circuit includes an optocoupler IC1, a resistor R10, a resistor R14 and a capacitor C10.

[0025] The above-mentioned motor control drive module includes a microprocessor MCU, an inverter circuit and a rotor position detection circuit.

[0026] The principle of the utility model is: Figure 4 As shown, only one gear detection circuit is drawn in the figure (the rest of the gear detection circuits are not drawn to facilitate understanding of the principle and save drawing size), the neutral line N or the live line L of the AC power input is arbitrarily selected as an input end of the optocoupler isolation detection circuit (i.e., the gear detection circuit), and the other input end of the optocoupler isolation detection circuit is connected to the middle voltage-dividing common end CON of the voltage-dividing circuit. It is assumed that the neutral line N or the live line L is arbitrarily selected as an input end of the optocoupler isolation detection circuit (i.e., the gear detection circuit), and is controlled by switch K1; when the live line L is used as an input end of the optocoupler isolation detection circuit, the signal is from the live line L-resistor R10-optocoupler IC1-resistor R12-neutral line N; when the neutral line N is used as an input end of the optocoupler isolation detection circuit, the signal is from the neutral line N-resistor R10-optocoupler IC1-resistor R11-live line L.

[0027] The utility model adopts an optocoupler isolation detection circuit, one input end of which is connected to the neutral line N or the live line L to detect the signal source, so there is no need to worry about the problem of wrong connection, and the gear detection circuit has a signal isolation function and is not easily interfered.

[0028] Embodiment 2:

[0029] An ECM motor includes a motor and a motor controller. The motor includes a stator assembly and a rotor assembly. The motor controller is characterized in that the motor controller adopts the motor controller with a novel gear detection circuit described in the first embodiment.

[0030] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A motor controller with a novel gear detection circuit, comprising a rectifier circuit, a DC-DC conversion power supply circuit, a motor control drive module and several gear detection circuits, wherein the neutral line N and the live line L of the mains power input are used as the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the input end of the DC-DC conversion power supply circuit, the output end of the DC-DC conversion power supply circuit is used to supply power to the motor control drive module, and the gear detection circuit adopts an optical coupler isolation detection circuit, which is characterized in that It also includes a voltage divider circuit, the two ends of the voltage divider circuit are respectively connected to the neutral line N and the live line L, one input end of the optocoupler isolation detection circuit is connected to the neutral line N or the live line L to detect the signal source, the other input end of the optocoupler isolation detection circuit is connected to the middle voltage divider common end CON of the voltage divider circuit, and the output ends of several optocoupler isolation detection circuits are connected to the motor control drive module.

2. A motor controller with a novel gear detection circuit according to claim 1, characterized in that: The voltage divider circuit includes a resistor R11 and a resistor R12. The resistors R11 and R12 are connected in series, and both ends thereof are connected to a neutral line N or a live line L respectively. A voltage divider common terminal CON is drawn between the resistors R11 and R12.

3. A motor controller with a novel gear detection circuit according to claim 1 or 2, characterized in that: The optocoupler isolation detection circuit includes an optocoupler IC1, a resistor R10, a resistor R14 and a capacitor C10.

4. A motor controller with a novel gear detection circuit according to claim 3, characterized in that: The motor control drive module includes a microprocessor MCU, an inverter circuit and a rotor position detection circuit.

5. An ECM motor, comprising a motor and a motor controller, wherein the motor comprises a stator assembly and a rotor assembly, characterized in that: The motor controller adopts the motor controller with a novel gear detection circuit as described in any one of claims 1 to 4.

Images