Motor control circuit and electronic injector

Abstract

The utility model provides a motor control circuit and an electronic injector. The motor control circuit comprises a logic gate chip, a driver and a motor, a first OR gate input end of the logic gate chip is connected with an automatic control pin of the controller, a second OR gate input end of the logic gate chip is connected with a manual control pin of the controller, an AND gate input end of the logic gate chip is connected with a motor control pin of the controller, and an output end of the logic gate chip is connected with a sleep pin of the driver; the input end of the first or gate is connected with the input end of the second or gate through an or gate, the input end of the first or gate and the output end of the second or gate are connected with the input end of the AND gate through the AND gate, and the output end of the logic gate chip is the output end of the AND gate; the input end of the driver is connected with the signal end of the controller, and the output end of the driver is connected with the control end of the motor; the motor comprises an encoder which is connected with the controller. The motor provided by the utility model can work in multiple modes.

Description

Technical Field

[0001] This utility model relates to the technical field of motor control, specifically to a motor control circuit and an electronic injector. Background Technology

[0002] An electronic injector consists of a controller, a driver, and a motor. The controller outputs a PWM signal, which is amplified and converted before being sent to the motor. The motor drives the lead screw to rotate, propelling the injector piston for precise injection. The controller typically has a sleep pin, which receives signals to control the controller's operating state, thereby controlling the motor's operation. However, existing electronic injectors have two modes: manual and automatic. In manual mode, the motor operates only when a button is pressed. In automatic mode, the motor's movement is controlled by a preset time set by the controller. Because the electronic controller only has one sleep pin, the signals output to this pin can become inconsistent when multiple modes are in operation. For example, pressing the manual switch when the motor is off might still activate the electronic injector, leading to a confusion in its operating mode.

[0003] A current high-speed handle speed control circuit includes a controller, a DC motor drive module, and a current signal processing module. The controller is connected to both the DC motor drive module and the current signal processing module. It also includes a speed detection circuit, which consists of a protection circuit, a low-pass filter, and a level conversion and shaping circuit. However, this circuit lacks a control mode and cannot adjust the motor's operating mode, resulting in a poor user experience. Utility Model Content

[0004] The primary objective of this invention is to provide a motor control circuit that can adjust the motor's operating mode.

[0005] The second objective of this invention is to provide an electronic injector that utilizes the aforementioned motor control circuit.

[0006] To achieve the first objective of this utility model, the motor control circuit provided by this utility model is characterized by comprising: a logic gate chip, a driver, and a motor; the first OR gate input of the logic gate chip is connected to the automatic control pin of the controller, the second OR gate input of the logic gate chip is connected to the manual control pin of the controller, the AND gate input of the logic gate chip is connected to the motor control pin of the controller, and the output of the logic gate chip is connected to the sleep pin of the driver; the first OR gate input and the second OR gate input are connected via an OR gate, the output of the OR gate and the AND gate input are connected via an AND gate, and the output of the logic gate chip is the output of the AND gate; the input of the driver is connected to the signal terminal of the controller, and the output of the driver is connected to the control terminal of the motor; the motor includes an encoder, and the encoder is connected to the controller.

[0007] Therefore, by connecting the first OR gate input of the logic gate chip to the automatic control pin, the second OR gate input to the manual control pin, and the AND gate input to the motor control pin of the controller, the motor only starts working when the motor control pin outputs a high level and either the automatic or manual control pin inputs are high. If the motor control pin does not output a high level, but both the automatic and manual control pins output high levels, the driver does not work. This allows the motor to operate in multiple modes. Since only one logic gate chip is used to implement multiple motor operating modes, the computational load on the controller is reduced.

[0008] In a further embodiment, the driver's input terminals include a first input terminal and a second input terminal, and the controller's signal output terminals include a first signal terminal and a second signal terminal; the first input terminal is connected to the first signal terminal, and the second input terminal is connected to the second signal terminal.

[0009] In a further embodiment, the output terminal of the driver includes a first signal output terminal and a second signal output terminal, and the control terminal of the motor includes a first control terminal and a second control terminal. The first signal output terminal is connected to the first control terminal, and the second signal output terminal is connected to the second control terminal.

[0010] Therefore, motor control requires two complementary PWM signals to be output, so the controller needs to output two complementary signals.

[0011] In a further embodiment, the first signal output terminal is connected to the first end of the first inductor, and the second end of the first inductor is connected to the first control terminal; the second signal output terminal is connected to the first end of the second inductor, and the second end of the second inductor is connected to the second control terminal.

[0012] Therefore, the first and second inductors filter the signal and suppress high-frequency ripple, thereby protecting the circuit.

[0013] In a further embodiment, the second end of the first inductor is connected to the first end of the first transient suppression diode, and the second end of the first transient suppression diode is connected to the ground terminal; the second end of the second inductor is connected to the first end of the second transient suppression diode, and the second end of the second transient suppression diode is connected to the ground terminal.

[0014] Therefore, the first transient suppression diode and the second transient suppression diode can suppress power surges, thereby protecting the circuit.

[0015] In a further embodiment, the motor includes a first encoder pin and a second encoder pin. The first encoder pin is connected to the gate of a first field-effect transistor (FET), the drain of the first FET is connected to a power supply terminal, and the source of the first FET is connected to a ground terminal. The drain of the first FET is also connected to the first detection pin of the controller.

[0016] In a further embodiment, the second encoder pin is connected to the gate of the second field-effect transistor, the drain of the second field-effect transistor is connected to the power supply terminal, and the source of the second field-effect transistor is connected to the ground terminal.

[0017] Therefore, by using the first and second field-effect transistors, the voltage of the signals received by the first and second detection pins of the controller is a voltage that the controller can withstand, thus preventing the controller from being burned out due to the high voltage of the encoder.

[0018] In a further embodiment, the first encoder pin is connected to the first end of the third inductor, and the second end of the third inductor is connected to the gate of the first field-effect transistor; the second encoder pin is connected to the first end of the fourth inductor, and the second end of the fourth inductor is connected to the gate of the second field-effect transistor.

[0019] Therefore, the third and fourth inductors filter the signal and suppress high-frequency ripple, thereby protecting the circuit.

[0020] In a further embodiment, the first end of the third inductor is connected to the first end of the third transient suppression diode, and the second end of the third transient suppression diode is connected to the ground terminal; the first end of the fourth inductor is connected to the first end of the fourth transient suppression diode, and the second end of the fourth transient suppression diode is connected to the ground terminal.

[0021] Therefore, the third and fourth transient suppression diodes can suppress power surges, thereby protecting the circuit.

[0022] To achieve the second objective, the electronic injector provided by this invention utilizes the aforementioned motor control circuit. Attached Figure Description

[0023] Figure 1 This is a circuit diagram of an embodiment of the motor control circuit of this utility model.

[0024] Figure 2 This is an enlarged circuit diagram of the gate logic chip and controller of an embodiment of the motor control circuit of this utility model.

[0025] Figure 3 This is an enlarged circuit diagram of the motor in an embodiment of the motor control circuit of this utility model.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0027] This invention provides a motor control circuit that enables the motor to operate in multiple modes through the control of logic gate chips. Furthermore, since only one logic gate chip is used to implement multiple modes of motor operation, the computational load of the controller is reduced.

[0028] See Figure 1 , Figure 2 and Figure 3 The motor control circuit in this embodiment includes a controller (not shown in the figure), a logic gate chip U1, a driver U2, and a motor U3. The controller is connected to the driver, and the controller controls the operation of the driver U2 through the logic gate chip. The driver U2 is connected to the motor U3. In this embodiment, the motor U3 is a motor with a built-in encoder. When outputting a signal to the motor, it can simultaneously receive the encoder signal from the motor. The encoder signal is used to adjust the output of the PWM signal, thereby controlling the speed of the motor. The logic gate chip U1 is a conventional logic gate chip.

[0029] The first OR gate input A of logic gate chip U1 is connected to the automatic control pin in1 of the controller; the second OR gate input B of logic gate chip U1 is connected to the manual control pin in2 of the controller; the AND gate input C of logic gate chip U1 is connected to the motor control pin in3 of the controller; and the output Y of logic gate chip U1 is connected to the sleep pin nSLEEP of the driver.

[0030] The motor control circuit in this embodiment also includes a power button, a manual button, and an automatic button (not shown in the figure), which are connected to the controller. When the power button signal is received, the controller controls the motor control pin in3 to switch the level signal. When the automatic button signal is received, the controller controls the automatic control pin in1 to output a high-level signal for a preset time. The controller only outputs a high-level signal to the manual control pin in2 when it receives a manual button signal; that is, the duration of pressing and holding the manual button is the duration for which the controller outputs a high-level signal.

[0031] The working principle of logic gate chip U1 is as follows: the input terminal A of the first OR gate is connected to the input terminal B of the second OR gate through an OR gate, and the output terminal of the OR gate is connected to the input terminal C of the AND gate through an AND gate. The output terminal Y of logic gate chip U1 is the output terminal of the AND gate. Thus, the formula Y = (A + B) • C is realized.

[0032] The driver's input terminals EN / IN1 and PH / IN2 are connected to the controller's signal terminals Motor1 and Motor2, and the driver's output terminals OUT1 and OUT2 are connected to the motor's control terminals Motor+ and Motor-.

[0033] The input terminals of the driver U2 include a first input terminal EN / IN1 and a second input terminal PH / IN2, and the signal output terminals of the controller include a first signal terminal Motor1 and a second signal terminal Motor2; the first input terminal EN / IN1 is connected to the first signal terminal Motor1, and the second input terminal PH / IN2 is connected to the second signal terminal Motor2.

[0034] The driver's output terminals include a first signal output terminal OUT1 and a second signal output terminal OUT2. The motor's control terminals include a first control terminal Motor+ and a second control terminal Motor-. The first signal output terminal OUT1 is connected to the first control terminal Motor+, and the second signal output terminal OUT2 is connected to the second control terminal Motor+.

[0035] The first signal output terminal OUT1 is connected to the first terminal of the first inductor L1, and the second terminal of the first inductor L1 is connected to the first control terminal Motor+; the second signal output terminal OUT2 is connected to the first terminal of the second inductor L2, and the second terminal of the second inductor L2 is connected to the second control terminal Motor-. The first inductor L1 and the second inductor L2 filter the signal, suppressing high-frequency ripple, thereby protecting the circuit.

[0036] The second terminal of the first inductor L1 is connected to the first terminal of the first transient voltage suppressor diode D2, and the second terminal of the first transient voltage suppressor diode D2 is connected to the ground terminal. The second terminal of the second inductor L2 is connected to the first terminal of the second transient voltage suppressor diode D3, and the second terminal of the second transient voltage suppressor diode D3 is connected to the ground terminal GND. The first transient voltage suppressor diode D2 and the second transient voltage suppressor diode D3 can suppress power surges, thereby protecting the circuit.

[0037] Motor U3 is a motor with a built-in encoder, which is connected to the controller. Motor U3 includes a first encoder pin HALL+ and a second encoder pin HALL-. The first encoder pin HALL+ is connected to the gate of a first field-effect transistor Q2. The drain of Q2 is connected to the power supply VCC, and the source is connected to ground GND. The drain of Q2 is also connected to the controller's first detection pin HALL_A. The second encoder pin HALL- is connected to the gate of a second field-effect transistor Q1. The drain of Q1 is connected to the power supply VCC, and the source is connected to ground GND. Therefore, the first and second field-effect transistors Q2 and Q1 ensure that the voltage of the signals received by the controller's first and second detection pins HALL+ and HALL- is within the controller's tolerance range, preventing the controller from being burned out due to high encoder voltage.

[0038] The first encoder pin is connected to the first terminal of the third inductor L3, and the second terminal of the third inductor L3 is connected to the gate of the first field-effect transistor Q2. The second encoder pin HALL- is connected to the first terminal of the fourth inductor L4, and the second terminal of the fourth inductor L4 is connected to the gate of the second field-effect transistor Q1. The third inductor L3 and the fourth inductor L4 filter the signal and suppress high-frequency ripple, thereby protecting the circuit.

[0039] The first terminal of the third inductor L3 is connected to the first terminal of the third transient voltage suppressor diode D4, and the second terminal of the third transient voltage suppressor diode D4 is connected to the ground terminal GND; the first terminal of the fourth inductor L4 is connected to the first terminal of the fourth transient voltage suppressor diode D5, and the second terminal of the fourth transient voltage suppressor diode D5 is connected to the ground terminal GND. The third transient voltage suppressor diode D4 and the fourth transient voltage suppressor diode D5 can suppress power surges, thereby protecting the circuit.

[0040] The motor only starts operating when the motor control pin outputs a high level, and either the automatic control pin or the manual control pin also outputs a high level. If the motor control pin does not output a high level, but both the automatic and manual control pins output high levels, the driver does not operate. This allows the motor to operate in multiple modes. Since only a single logic gate chip is used to implement multiple motor operating modes, the computational load on the controller is reduced.

[0041] The above is only a preferred embodiment of the present utility model, but the design concept of the utility model is not limited thereto. Without departing from the concept of the present utility model, more other equivalent embodiments may be included. Those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present utility model.

Claims

1. A motor control circuit, characterized in that, include: Logic gate chips, drivers, and motors; The first OR gate input of the logic gate chip is connected to the automatic control pin of the controller, the second OR gate input of the logic gate chip is connected to the manual control pin of the controller, the AND gate input of the logic gate chip is connected to the motor control pin of the controller, and the output of the logic gate chip is connected to the sleep pin of the driver. The first OR gate input terminal is connected to the second OR gate input terminal via an OR gate, the OR gate output terminal is connected to the AND gate input terminal via an AND gate, and the output terminal of the logic gate chip is the output terminal of the AND gate; The input terminal of the driver is connected to the signal terminal of the controller, and the output terminal of the driver is connected to the control terminal of the motor. The motor includes an encoder, which is connected to the controller.

2. The motor control circuit according to claim 1, characterized in that: The input terminals of the driver include a first input terminal and a second input terminal, and the signal output terminals of the controller include a first signal terminal and a second signal terminal; The first input terminal is connected to the first signal terminal, and the second input terminal is connected to the second signal terminal.

3. The motor control circuit according to claim 2, characterized in that: The output terminal of the driver includes a first signal output terminal and a second signal output terminal, and the control terminal of the motor includes a first control terminal and a second control terminal. The first signal output terminal is connected to the first control terminal, and the second signal output terminal is connected to the second control terminal.

4. The motor control circuit according to claim 3, characterized in that: The first signal output terminal is connected to the first terminal of the first inductor, and the second terminal of the first inductor is connected to the first control terminal; The second signal output terminal is connected to the first terminal of the second inductor, and the second terminal of the second inductor is connected to the second control terminal.

5. The motor control circuit according to claim 4, characterized in that: The second terminal of the first inductor is connected to the first terminal of the first transient suppression diode, and the second terminal of the first transient suppression diode is connected to the ground terminal; The second terminal of the second inductor is connected to the first terminal of the second transient suppression diode, and the second terminal of the second transient suppression diode is connected to the ground terminal.

6. The motor control circuit according to any one of claims 1 to 5, characterized in that: The motor includes a first encoder pin and a second encoder pin. The first encoder pin is connected to the gate of a first field-effect transistor. The drain of the first field-effect transistor is connected to a power supply terminal, and the source of the first field-effect transistor is connected to a ground terminal. The drain of the first field-effect transistor is also connected to the first detection pin of the controller.

7. The motor control circuit according to claim 6, characterized in that: The second encoder pin is connected to the gate of the second field-effect transistor, the drain of the second field-effect transistor is connected to the power supply terminal, and the source of the second field-effect transistor is connected to the ground terminal.

8. The motor control circuit according to claim 7, characterized in that: The first encoder pin is connected to the first end of the third inductor, and the second end of the third inductor is connected to the gate of the first field-effect transistor. The second encoder pin is connected to the first end of the fourth inductor, and the second end of the fourth inductor is connected to the gate of the second field-effect transistor.

9. The motor control circuit according to claim 8, characterized in that: The first end of the third inductor is connected to the first end of the third transient suppression diode, and the second end of the third transient suppression diode is connected to the ground terminal; The first end of the fourth inductor is connected to the first end of the fourth transient suppression diode, and the second end of the fourth transient suppression diode is connected to the ground terminal.

10. An electronic injector, characterized in that, The motor control circuit according to any one of claims 1 to 9 is applied.

Images