Electromagnetic clutch drive circuit and motor controller

Abstract

The utility model provides an electromagnetic clutch drive circuit and a motor controller, which relate to the technical field of motor control and comprise a power supply end, a grounding end, a high-side switch, a low-side switch and a coil of an electromagnetic clutch. One end of the high-side switch is connected with a power supply end, and the other end is connected with a coil of the electromagnetic clutch to receive a closing / opening signal to control current passing through the coil of the electromagnetic clutch; one end of the low-side switch is connected with the grounding end, and the other end of the low-side switch is connected with a coil of the electromagnetic clutch to receive a PWM signal to control current passing through the coil of the electromagnetic clutch; the electromagnetic clutch driving circuit further comprises a main control chip which is connected with the low-side switch and the high-side switch and outputs a control instruction, the control instruction correspondingly outputs a PWM signal or a closing / opening signal so as to control the electromagnetic clutch to work, and the problems that an existing electromagnetic clutch driving circuit is complex in arrangement and high in safety risk are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor control, in particular to an electromagnetic clutch drive circuit and a motor controller. Background Art

[0002] An electromagnetic clutch is a device that uses electromagnetic principles to control the combination or separation of two rotating parts in a mechanical transmission system. The basic working principle of an electromagnetic clutch is to use the magnetic field generated by an electromagnetic coil. When the coil is energized, the magnetic field generated will attract the ferromagnetic material (such as the armature) inside the clutch, and the two rotating parts will be combined through friction, thereby transmitting power. When the power is off, the magnetic field disappears, and the armature is separated from the rotor under the action of the spring force, stopping the power transmission.

[0003] The existing electromagnetic clutch drive circuit uses a large number of converters, MOS tubes and other devices, has a complex layout, and lacks short-circuit protection settings, posing a high safety risk. Utility Model Content

[0004] In order to overcome the above technical defects, the purpose of the utility model is to provide an electromagnetic clutch drive circuit and a motor controller to solve the problems of complex layout and high safety risks of the existing electromagnetic clutch drive circuit.

[0005] The utility model discloses an electromagnetic clutch driving circuit, comprising:

[0006] Power supply terminal, ground terminal, high-side switch, low-side switch and coil of electromagnetic clutch;

[0007] One end of the high-side switch is connected to the power supply end, and the other end is connected to the coil of the electromagnetic clutch, and receives a closing / opening signal to control the current passing through the coil of the electromagnetic clutch;

[0008] One end of the low-side switch is connected to the ground terminal, and the other end is connected to the coil of the electromagnetic clutch, and receives a PWM signal to control the current passing through the coil of the electromagnetic clutch;

[0009] It also includes a main control chip, which is respectively connected to the low-side switch and the high-side switch and outputs control instructions. The control instructions correspond to output PWM signals or closing / opening signals to control the operation of the electromagnetic clutch.

[0010] Preferably, after receiving the vehicle control command, the main control chip outputs an on signal to the high-side switch, and then outputs a PWM signal to the low-side switch to control the current passing through the electromagnetic clutch coil.

[0011] Preferably, when the driving circuit has overcurrent / overtemperature, the main control chip outputs a PWM signal to the low-side switch, and the electromagnetic clutch is disengaged; or, the main control chip outputs a shutdown signal to the high-side switch, and the electromagnetic clutch is disengaged.

[0012] Preferably, the high-side switch is connected to a current limiting circuit;

[0013] The current limiting circuit comprises a current limiting resistor, one end of which is connected to the high-side switch, and the other end of which is grounded.

[0014] Preferably, the main control chip is connected to the current limiting circuit to output a control signal to control the operation of the current limiting circuit.

[0015] Preferably, the high-side switch is connected to a sampling circuit;

[0016] The sampling circuit comprises a sampling resistor, one end of which is connected to the high-side switch, and the other end of which is grounded.

[0017] Preferably, the main control chip is connected to the sampling circuit to output a sampling signal to control the operation of the sampling circuit.

[0018] Preferably, the main control chip receives feedback from the sampling circuit and adjusts the PWM signal corresponding to the output control instruction.

[0019] Preferably, a unidirectional diode is further included, and two ends of the unidirectional diode are respectively connected to two ends of the coil of the electromagnetic clutch.

[0020] The utility model also provides a motor controller, which applies any one of the electromagnetic clutch drive circuits described above.

[0021] Compared with the prior art, the above technical solution has the following beneficial effects:

[0022] The present application provides an electromagnetic clutch drive circuit and motor controller, which simplify the layout of the drive circuit through the combination of a high-side switch (IC) and a low-side switch (IC), and the control signal output by the main control chip is used to control the operation of the high-side switch and the low-side switch, wherein the high-side switch is controlled by an ON / OFF signal, and the low-side switch is controlled by PWM, thereby controlling the on / off of the electromagnetic clutch coil and the current amplitude, and has short-circuit to ground, short-circuit to power supply, short-circuit between coils, over-temperature and over-current protection functions, with a simple structure and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an electromagnetic clutch drive circuit and a motor controller embodiment of the utility model.

[0024] Reference numerals:

[0025] 1- Main control chip; 2- High-side switch; 3- Low-side switch; 4- Coil of electromagnetic clutch. DETAILED DESCRIPTION

[0026] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0028] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0029] The word "if" as used herein may be interpreted as "when" or "when" or "in response to determining," depending on the context.

[0030] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0032] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and they themselves have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0033] Embodiment: The utility model discloses an electromagnetic clutch drive circuit, which is applied to the control of new energy motors. For details, see Figure 1,include:

[0034] A power supply terminal VBB, a ground terminal GND, a high-side switch 2, a low-side switch 3 and a coil 4 (Lload, Rload) of an electromagnetic clutch; one end of the high-side switch 2 is connected to the power supply terminal VBB, and the other end is connected to the coil 4 of the electromagnetic clutch, and is used to receive a closing / opening signal to control the current passing through the coil 3 of the electromagnetic clutch; one end of the low-side switch 3 is connected to the ground terminal GND, and the other end is connected to the coil 4 of the electromagnetic clutch, and is used to receive a PWM signal to control the current passing through the coil 4 of the electromagnetic clutch;

[0035] As an illustration, the high-side switch 2 has the functions of output short circuit to ground, short circuit to power supply, short circuit between coils, over-temperature and over-current protection, and the low-side switch 3 has the functions of over-temperature and over-current protection. Through the setting of the high-side switch and the low-side switch, the control of the electromagnetic clutch drive circuit is realized, the arrangement of components is reduced, and the drive circuit can be realized with fewer components. At the same time, it can be automatically cut off in the case of short circuit, over-temperature and over-current, thereby improving safety during use.

[0036] Furthermore, it also includes a main control chip 1, which is respectively connected to the low-side switch 2 and the high-side switch 3 and outputs control instructions, and the control instructions correspond to the output PWM signal or the closing / opening signal to control the operation of the electromagnetic clutch.

[0037] In this embodiment, the electromagnetic clutch control method is to control the engagement, retention and separation of the clutch by the current on / off and amplitude of its coil. Specifically, it is realized by the combination of a high-side switch 2 (IC) and a low-side switch 3 (IC), wherein the high-side switch 2 and the low-side switch 3 can be an integrated circuit, integrating the required control logic and power MOSFET to withstand the voltage and provide the required control function, the input signal of the high-side switch 2 is ON / OFF (on / off) control, and the input signal of the low-side switch 3 is PWM control. Therefore, the current on / off and the current amplitude of the coil 4 of the electromagnetic clutch can be controlled according to the PWM control signal sent by the main control chip 1, and the control circuit has a complete short circuit to ground, short circuit to power supply, short circuit between coils, over-temperature and over-current protection functions.

[0038] In this embodiment, the main control chip 1 can control the normal working mode and abnormal working mode of the driving circuit. Specifically, the main control chip of the TLE6220GP, STM32 series and other models can be used to realize the corresponding control. Optionally, the high-side switch 2 and the low-side switch 3 can adopt a universal model. For example, TPS4H000-Q1, ULN2803C, etc., can realize the control in the driving circuit.

[0039] Specifically, the control of the main control chip 1 includes:

[0040] After receiving the vehicle control command, the main control chip 1 outputs an open signal to the high-side switch 2, enabling the high-side switch 2, and detects that there is no abnormal state (such as the short-circuit functions of the high-side switch are not triggered), and then outputs a PWM signal to the low-side switch 3 to control the on-off and amplitude of the current 4 passing through the electromagnetic clutch coil, thereby controlling the electromagnetic clutch to engage or maintain.

[0041] When the drive circuit has overcurrent / overtemperature, the main control chip 1 outputs a PWM signal to the low-side switch 3, and the electromagnetic clutch is disengaged; or, the main control chip 1 outputs a shutdown signal to the high-side switch 2, and the electromagnetic clutch is disengaged. It can be understood that the overcurrent / overtemperature of the above-mentioned drive circuit can be fed back to the main control chip through the protection function response signal of the high-side switch 2 / low-side switch 3, and can also be realized by setting a monitoring element or monitoring circuit in the drive circuit.

[0042] Based on the above, the main control chip 1 controls the high-side switch 2ON, and outputs a PWM signal (non-zero) only to the low-side switch 3, so that the coil 4 of the electromagnetic clutch is energized, thereby engaging the electromagnetic clutch. In this process, the PWM signal can also be adjusted to adjust the current amplitude passing through the coil 4 of the electromagnetic clutch, thereby affecting the working state of the electromagnetic clutch, such as attraction strength, transmission torque, response speed, electromagnetic interference, etc.; when the electromagnetic clutch needs to be disengaged, the high-side switch is disconnected or the low-side switch is disconnected, that is, the high-side switch 2OFF, or the output PWM signal is controlled to the low-side switch 3, thereby disengaging the electromagnetic clutch.

[0043] That is, when the FAULT_H signal (the abnormal signal fed back to the main control chip when the high-side switch detects internal or external abnormalities) is detected to be too low or the CS signal (the sampling signal of the sampling circuit) exceeds the set value or FAULT_L (the abnormal signal fed back to the main control chip when the low-side switch detects internal or external abnormalities), the IN_H signal can be set to trigger OFF CONTROL, or the IN_H and IN_L signals can be turned off through PWM signal control to stop the entire circuit from working.

[0044] In a preferred embodiment, the high-side switch 2 is connected to a current limiting circuit; the current limiting circuit includes a current limiting resistor R1, one end of which is connected to the high-side switch 2, and the other end is grounded. The current limiting circuit is used to limit the current output (CL) of the high-side switch 2, thereby preventing overload, improving circuit safety, and reducing electromagnetic interference.

[0045] Based on the above, the current limiting circuit is connected through the main control chip 1, and the operation of the current limiting circuit is controlled by outputting a control signal. For example, the current limiting resistor R1 can be set as a variable resistor, or the current limiting resistor R1 can be set to include a plurality of sub-resistors connected in series or in parallel, and different connection modes are formed through switch control to make the current limiting resistor variable, so as to realize dynamic adjustment of the output current of the high-side switch 2. Specifically, the main control chip 1 can dynamically control the size of the current limiting resistor or the connection of each sub-resistor.

[0046] In a preferred embodiment, the high-side switch 2 is connected to a sampling circuit; the sampling circuit includes a sampling resistor R2, one end of which is connected to the high-side switch 2, and the other end is grounded. The sampling circuit samples the high-side switch 2 side, and in addition to the above-mentioned sampling resistor, other components such as a converter and a filter can also be set to make the sampling result more accurate.

[0047] Based on the above, the main control chip 1 is connected to the sampling circuit to output a sampling signal to control the operation of the sampling circuit. The main control chip 1 controls the sampling frequency by outputting the sampling signal, and the sampling result obtained by the sampling circuit is fed back to the main control chip 1 for data collection. Further, the main control chip 1 receives the feedback of the sampling circuit and dynamically adjusts the PWM signal corresponding to the output control instruction, thereby adjusting the current passing through the coil of the electromagnetic clutch, thereby controlling the working state of the electromagnetic clutch.

[0048] The driving circuit of the electromagnetic clutch provided in this embodiment also includes a unidirectional diode D1, and the two ends of the unidirectional diode D1 are respectively connected to the two ends of the coil 4 of the electromagnetic clutch to realize unidirectional control of the coil 4 output to the input of the electromagnetic clutch. The unidirectional diode D1 is used for the inductance freewheeling of the coil 4 of the electromagnetic clutch. When the main control chip 1 controls the high-side switch 2OFF, or controls the output PWM signal to the low-side switch 3 so that the current through the coil 4 of the electromagnetic clutch is disconnected, the stored energy is released, the peak value of the induced electromotive force is reduced, the damage to the semiconductor devices in the circuit is reduced, and electromagnetic interference is further reduced. It can also realize a smooth shutdown process and improve the safety of use.

[0049] The utility model also provides a motor controller, which uses the electromagnetic clutch drive circuit described in any of the above items to perform drive control of the electromagnetic clutch. Further, as an option, other components / devices or circuits can be connected to be applied to different new energy motor control scenarios. Through the arrangement of the above electromagnetic clutch drive circuit, simple components are used to control the electromagnetic clutch, and it has protection functions against short circuit, over-temperature and over-current, thereby improving the safety of the application circuit.

[0050] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An electromagnetic clutch drive circuit, characterized in that: include: Power supply terminal, ground terminal, high-side switch, low-side switch and coil of electromagnetic clutch; One end of the high-side switch is connected to the power supply end, and the other end is connected to the coil of the electromagnetic clutch, and receives a closing / opening signal to control the current passing through the coil of the electromagnetic clutch; One end of the low-side switch is connected to the ground terminal, and the other end is connected to the coil of the electromagnetic clutch, and receives a PWM signal to control the current passing through the coil of the electromagnetic clutch; It also includes a main control chip, which is respectively connected to the low-side switch and the high-side switch and outputs control instructions. The control instructions correspond to output PWM signals or closing / opening signals to control the operation of the electromagnetic clutch.

2. The electromagnetic clutch drive circuit according to claim 1, characterized in that: After receiving the vehicle control command, the main control chip outputs an open signal to the high-side switch, and then outputs a PWM signal to the low-side switch to control the current passing through the electromagnetic clutch coil.

3. The electromagnetic clutch drive circuit according to claim 1, characterized in that: When the driving circuit has overcurrent / overtemperature, the main control chip outputs a PWM signal to the low-side switch, and the electromagnetic clutch is disengaged; Alternatively, the main control chip outputs a closing signal to the high-side switch, and the electromagnetic clutch is disengaged.

4. The electromagnetic clutch drive circuit according to claim 1, characterized in that: The high-side switch is connected to a current-limiting circuit; The current limiting circuit comprises a current limiting resistor, one end of which is connected to the high-side switch, and the other end of which is grounded.

5. The electromagnetic clutch drive circuit according to claim 4, characterized in that: The main control chip is connected to the current limiting circuit to output a control signal to control the operation of the current limiting circuit.

6. The electromagnetic clutch drive circuit according to claim 1, characterized in that: The high-side switch is connected to a sampling circuit; The sampling circuit comprises a sampling resistor, one end of which is connected to the high-side switch, and the other end of which is grounded.

7. The electromagnetic clutch drive circuit according to claim 6, characterized in that: The main control chip is connected to the sampling circuit to output a sampling signal to control the operation of the sampling circuit.

8. The electromagnetic clutch drive circuit according to claim 7, characterized in that: The main control chip receives feedback from the sampling circuit and adjusts the PWM signal corresponding to the output control instruction.

9. The electromagnetic clutch drive circuit according to claim 1, characterized in that: It also includes a unidirectional diode, two ends of which are respectively connected to two ends of the coil of the electromagnetic clutch.

10. A motor controller, characterized in that: An electromagnetic clutch drive circuit as claimed in any one of claims 1 to 9 is used.

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