An electromagnetic clutch circuit and an automobile

Abstract

The present invention discloses an electromagnetic clutch circuit and an automobile. The electromagnetic clutch includes: an anti-reverse connection unit and a clutch half-bridge working unit; wherein, the clutch half-bridge working unit includes a negative electrode access terminal and a positive electrode access terminal, and the positive electrode access terminal of the clutch half-bridge working unit is connected to an external power supply through the anti-reverse connection unit; the anti-reverse connection unit includes a MOS transistor and a control signal access terminal, and the MOS transistor realizes the on-off control between the positive electrode access terminal of the clutch half-bridge working unit and the external power supply according to the pulse control signal received by the control signal access terminal, so as to realize the functions of anti-reverse connection and anti-reverse voltage overshoot of the electromagnetic clutch circuit. The electromagnetic clutch circuit in the present invention realizes the functions of anti-reverse connection and anti-reverse voltage overshoot of the circuit with very few devices, effectively avoiding the power supply voltage reverse connection fault and the reverse voltage overshoot fault.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic clutches, and particularly relates to an electromagnetic clutch circuit and an automobile. Background Art

[0002] The electromagnetic clutch system is gradually recognized by the market due to its excellent operability. However, during the actual market promotion process, there have always been problems such as reverse connection of the input voltage and excessive reverse overshoot voltage in the internal circuit, resulting in frequent fault alarms in the electromagnetic clutch system. However, the existing electromagnetic clutch circuit design has a complex structure and a large number of components, and it is impossible to achieve the functions of anti-reverse connection and anti-reverse overshoot simultaneously. Summary of the Invention

[0003] In view of the above problems, the present invention discloses an electromagnetic clutch circuit and an automobile to overcome or at least partially solve the above problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] On the one hand, the present invention discloses an electromagnetic clutch circuit, and the electromagnetic clutch includes: an anti-reverse connection unit and a clutch half-bridge working unit; wherein, the clutch half-bridge working unit includes a negative electrode access terminal and a positive electrode access terminal, and the positive electrode access terminal of the clutch half-bridge working unit is connected to an external power supply through the anti-reverse connection unit;

[0006] The anti-reverse connection unit includes an MOS transistor and a control signal access terminal, and the MOS transistor realizes the on-off control between the positive electrode access terminal of the clutch half-bridge working unit and the external power supply according to the pulse control signal received by the control signal access terminal, thereby realizing the functions of anti-reverse connection and anti-reverse voltage overshoot of the electromagnetic clutch circuit.

[0007] Further, the MOS transistor of the anti-reverse connection unit is a P-MOS transistor, and the drain of the P-MOS transistor is connected to the external power supply; the source of the P-MOS transistor is connected to the positive electrode access terminal of the clutch half-bridge working unit; the gate of the P-MOS transistor is connected to the control signal access terminal.

[0008] Further, the anti-reverse connection unit further includes: a first resistor, a second resistor and a transistor;

[0009] The collector of the transistor is respectively connected to the gate of the P-MOS transistor and one end of the first resistor through the second resistor, the other end of the first resistor is connected to the source of the P-MOS transistor, the base of the transistor is connected to the control signal access terminal, and the emitter of the transistor is connected to the negative electrode access terminal of the clutch half-bridge working unit.

[0010] Further, when the external power supply is correctly connected to the electromagnetic clutch circuit, the external power supply supplies power to the positive electrode access terminal of the clutch half-bridge working unit through the body diode of the P-MOS transistor; at this time, the pulse control signal is at a high level, the transistor is turned on, and the voltage at the positive electrode access terminal of the clutch half-bridge working unit is divided by the first resistor and the second resistor to provide a driving voltage for the P-MOS transistor, driving the P-MOS transistor to turn on, and enabling the external power supply to supply power to the clutch half-bridge working unit;

[0011] When the external power supply is incorrectly connected to the electromagnetic clutch circuit, the external power supply cannot supply power to the positive electrode access terminal of the clutch half-bridge working unit through the body diode of the P-MOS transistor; at this time, the pulse control signal is at a low level, the transistor is turned off, the P-MOS transistor is not turned on, and the external power supply is blocked from supplying power to the clutch half-bridge working unit.

[0012] Further, the clutch half-bridge working unit includes: an electromagnetic clutch coil, a first N-MOS transistor, a second N-MOS transistor, a first diode, and a second diode;

[0013] The source of the first N-MOS transistor, the negative electrode of the second diode, and one end of the electromagnetic clutch coil are connected; the positive electrode of the first diode, the drain of the second N-MOS transistor, and the other end of the electromagnetic clutch coil are connected; the drain of the first N-MOS transistor is connected to the negative electrode of the first diode to form the positive electrode access terminal, and the positive electrode of the second diode and the source of the second N-MOS transistor are connected to form the negative electrode access terminal.

[0014] Further, the first diode and the second diode are freewheeling diodes.

[0015] Further, when the clutch half-bridge working unit switches from the energized state to the de-energized state, the MOS transistor of the reverse connection prevention unit conducts the positive electrode access terminal and the external power supply, and the electromagnetic clutch coil, the first diode, the second diode, and the external power supply form a loop, feeding back the electromotive force generated by the electromagnetic clutch coil to the external power supply, and limiting the voltage value at the positive electrode access terminal within a safe range.

[0016] On the other hand, the present invention discloses an automobile, and the electromagnetic clutch circuit as described above is installed on the automobile.

[0017] The advantages and beneficial effects of the present invention are:

[0018] The electromagnetic clutch circuit in the present invention uses very few components to achieve the functions of preventing reverse connection and reverse voltage overshoot of the circuit, and the circuit structure is simple, which can effectively avoid the faults of reverse connection of the power supply voltage and reverse voltage overshoot. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as limiting the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0020] Figure 1 is a schematic diagram of the connection relationship of the electromagnetic clutch circuit in an embodiment of the present invention;

[0021] Figure 2 is the circuit schematic diagram of the electromagnetic clutch circuit in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the specific embodiments and corresponding drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] The following will detail the technical solutions provided by each embodiment of the present invention in conjunction with the drawings.

[0024] Embodiment 1

[0025] An electromagnetic clutch circuit is disclosed in an embodiment of the present invention. As Figure 1 shown, the electromagnetic clutch circuit includes: an anti-reverse connection unit and a clutch half-bridge working unit; the clutch half-bridge working unit includes a negative access terminal and a positive access terminal, and the positive access terminal of the clutch half-bridge working unit is connected to an external power supply through the anti-reverse connection unit to achieve anti-reverse connection of the clutch half-bridge working unit.

[0026] The anti-reverse connection unit includes MOS transistor Q1 and a control signal access terminal POWER_ON. MOS transistor Q1 controls the on-off between the positive access terminal of the clutch half-bridge working unit and the external power supply according to the pulse control signal received by the control signal access terminal POWER_ON, thereby achieving the functions of preventing reverse connection and reverse voltage overshoot of the electromagnetic clutch circuit.

[0027] In summary, the electromagnetic clutch circuit in this embodiment uses extremely few components to achieve the functions of preventing reverse connection and reverse voltage overshoot of the circuit. Moreover, the circuit structure is simple, which can effectively avoid the faults of reverse connection of the power supply voltage and reverse voltage overshoot.

[0028] In one embodiment, as Figure 2 shown, the MOS transistor Q1 of the reverse connection prevention unit is a P-MOS transistor Q1. The drain of the P-MOS transistor Q1 is connected to an external power supply; the source of the P-MOS transistor Q1 is connected to the positive terminal access end of the clutch half-bridge working unit, and the external power supply provides a driving voltage for the clutch half-bridge working unit through the P-MOS transistor Q1; the gate of the P-MOS transistor Q1 is connected to the control signal access end POWER_ON, and the on / off of the P-MOS transistor Q1 is regulated by the pulse control signal received through the control signal access end POWER_ON.

[0029] In one embodiment, as Figure 2 shown, the reverse connection prevention unit further includes: a first resistor R1, a second resistor R2, and a transistor Q3, where the first resistor R1 and the second resistor R2 play a role in voltage division.

[0030] The collector of the transistor Q3 is connected to the gate of the P-MOS transistor Q1 and one end of the first resistor R1 through the second resistor R2. The other end of the first resistor R1 is connected to the source of the P-MOS transistor Q1. The base of the transistor Q3 is connected to the control signal access end POWER_ON, and the emitter of the transistor Q3 is connected to the negative terminal access end of the clutch half-bridge working unit. When the control signal access end POWER_ON receives a high-level pulse control signal, the transistor Q3 conducts, and the current of the external power supply flows through the body diode of the P-MOS transistor Q1, the first resistor R1, the second resistor R2, and the transistor Q3 in sequence, thereby providing a driving voltage for the P-MOS transistor Q1 and driving the P-MOS transistor Q1 to conduct; when the control signal access end POWER_ON receives a low-level pulse control signal, the transistor Q3 cuts off and cannot provide a driving voltage for the P-MOS transistor Q1, and the P-MOS transistor Q1 does not conduct.

[0031] In one embodiment, when the external power supply is correctly connected to the electromagnetic clutch circuit, the external power supply supplies power to the positive terminal access end of the clutch half-bridge working unit through the body diode of the P-MOS transistor Q1. The voltage of the external power supply can only be supplied through the body diode of the P-MOS transistor Q1 for a short time. Since the resistance of its body diode is large, the current passing through the body diode for a long time will cause its temperature to rise; at this time, the pulse control signal is at a high level, the transistor Q3 conducts, and the voltage at the positive terminal access end of the clutch half-bridge working unit is divided by the first resistor R1 and the second resistor R2 to provide a driving voltage for the P-MOS transistor Q1, driving the P-MOS transistor Q1 to conduct, and realizing the power supply of the external power supply to the clutch half-bridge working unit.

[0032] When the external power supply polarity is wrongly connected to the electromagnetic clutch circuit, the external power supply cannot supply power to the positive input terminal of the clutch half-bridge working unit through the body diode of the P-MOS transistor Q1. At this time, the pulse control signal is at a low level, the transistor Q3 is cut off, and cannot provide a driving voltage for the P-MOS transistor Q1. The P-MOS transistor Q1 is not turned on, blocking the external power supply from supplying power to the clutch half-bridge working unit.

[0033] In one embodiment, as Figure 2 shown, the clutch half-bridge working unit includes: an electromagnetic clutch coil L1, a first N-MOS transistor Q2, a second N-MOS transistor Q4, a first diode D1, and a second diode D2.

[0034] The source of the first N-MOS transistor Q2, the negative electrode of the second diode D2, and one end of the electromagnetic clutch coil L1 are connected. The positive electrode of the first diode D1, the drain of the second N-MOS transistor Q4, and the other end of the electromagnetic clutch coil L1 are connected. Among them, the source of the first N-MOS transistor Q2 is connected to the positive input terminal of the electromagnetic clutch coil L1, and the drain of the second N-MOS transistor Q4 is connected to the negative input terminal of the electromagnetic clutch coil L1. The drain of the first N-MOS transistor Q2 is connected to the negative electrode of the first diode D1 to form a positive input terminal, and the positive electrode of the second diode D2 and the source of the second N-MOS transistor Q4 are connected to form a negative input terminal.

[0035] In a preferred embodiment, the first diode D1 and the second diode D2 are freewheeling diodes.

[0036] In a preferred embodiment, when the clutch half-bridge working unit switches from the powered-on state to the powered-off state, the MOS transistor Q1 of the reverse connection prevention unit conducts the positive input terminal and the external power supply. The electromagnetic clutch coil L1, the first diode D1, the second diode D2, and the external power supply form a loop. The current sequentially passes through the second diode D2, the electromagnetic clutch coil L1, and the first diode D1, feeding back the electromotive force generated by the electromagnetic clutch coil L1 to the external power supply, restricting the voltage value of the positive input terminal within a safe range, and realizing the prevention of reverse voltage overshoot of the circuit.

[0037] Embodiment 2

[0038] An embodiment of the present invention discloses an automobile, and the above-mentioned electromagnetic clutch circuit is installed on the automobile.

[0039] In summary, the present invention discloses an electromagnetic clutch circuit and an automobile. The electromagnetic clutch includes: an anti-reverse connection unit and a clutch half-bridge working unit; wherein, the clutch half-bridge working unit includes a negative electrode access terminal and a positive electrode access terminal, and the positive electrode access terminal of the clutch half-bridge working unit is connected to an external power supply through the anti-reverse connection unit; the anti-reverse connection unit includes a MOS transistor and a control signal access terminal, and the MOS transistor realizes the on-off control between the positive electrode access terminal of the clutch half-bridge working unit and the external power supply according to the pulse control signal received by the control signal access terminal, thereby realizing the anti-reverse connection and anti-reverse voltage overshoot functions of the electromagnetic clutch circuit. The electromagnetic clutch circuit in the present invention realizes the anti-reverse connection and anti-reverse voltage overshoot functions of the circuit with very few devices, effectively avoiding the power supply voltage reverse connection fault and the reverse voltage overshoot fault.

[0040] The above is only the embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, extension, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An electromagnetic clutch circuit, characterized in that, The electromagnetic clutch includes: an anti-reverse connection unit and a clutch half-bridge working unit; wherein, the clutch half-bridge working unit includes a negative electrode access terminal and a positive electrode access terminal, and the positive electrode access terminal of the clutch half-bridge working unit is connected to an external power supply through the anti-reverse connection unit; The anti-reverse connection unit includes an MOS transistor and a control signal access terminal, and the MOS transistor realizes the on-off control between the positive electrode access terminal of the clutch half-bridge working unit and the external power supply according to the pulse control signal received by the control signal access terminal, so as to realize the anti-reverse connection and anti-reverse voltage overshoot functions of the electromagnetic clutch circuit; The clutch half-bridge working unit includes: an electromagnetic clutch coil, a first diode and a second diode; When the clutch half-bridge working unit switches from the powered-on state to the powered-off state, the MOS transistor of the anti-reverse connection unit conducts the positive electrode access terminal and the external power supply, and the electromagnetic clutch coil, the first diode, the second diode and the external power supply form a loop to feedback the electromotive force generated by the electromagnetic clutch coil to the external power supply, restricting the voltage value of the positive electrode access terminal within a safe range; The MOS transistor of the anti-reverse connection unit is a P-MOS transistor, and the drain of the P-MOS transistor is connected to the external power supply; the source of the P-MOS transistor is connected to the positive electrode access terminal of the clutch half-bridge working unit; the gate of the P-MOS transistor is connected to the control signal access terminal; The anti-reverse connection unit further includes: a first resistor, a second resistor and a transistor; The collector of the transistor is respectively connected to the gate of the P-MOS transistor and one end of the first resistor through the second resistor, the other end of the first resistor is connected to the source of the P-MOS transistor, the base of the transistor is connected to the control signal access terminal, and the emitter of the transistor is connected to the negative electrode access terminal of the clutch half-bridge working unit; When the external power supply is correctly connected to the electromagnetic clutch circuit, the external power supply supplies power to the positive electrode access terminal of the clutch half-bridge working unit through the body diode of the P-MOS transistor; at this time, the pulse control signal is at a high level, the transistor is turned on, and the voltage of the positive electrode access terminal of the clutch half-bridge working unit is divided by the first resistor and the second resistor to provide a driving voltage for the P-MOS transistor, driving the P-MOS transistor to conduct, and realizing the power supply of the external power supply to the clutch half-bridge working unit; When the external power supply is wrongly connected to the electromagnetic clutch circuit, the external power supply cannot supply power to the positive electrode access terminal of the clutch half-bridge working unit through the body diode of the P-MOS transistor; at this time, the pulse control signal is at a low level, the transistor is cut off, the P-MOS transistor is not turned on, and the external power supply is blocked from supplying power to the clutch half-bridge working unit.

2. The electromagnetic clutch circuit according to claim 1, characterized in that The clutch half-bridge working unit includes: a first N-MOS transistor, a second N-MOS transistor; The source of the first N-MOS transistor, the negative electrode of the second diode, and one end of the electromagnetic clutch coil are connected; the positive electrode of the first diode, the drain of the second N-MOS transistor, and the other end of the electromagnetic clutch coil are connected; the drain of the first N-MOS transistor is connected to the negative electrode of the first diode to form the positive electrode access terminal, and the positive electrode of the second diode and the source of the second N-MOS transistor are connected to form the negative electrode access terminal.

3. The electromagnetic clutch circuit according to claim 2, wherein The first diode and the second diode are freewheeling diodes.

4. A vehicle, characterized in that, The electromagnetic clutch circuit as described in any one of claims 1-3 is installed on the vehicle.

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