Motor driving circuit

Abstract

The utility model discloses a motor drive circuit, which comprises a drive chip U1, a resistor R8 and a capacitor C1, one end of the resistor R8 is respectively connected with one end of an external power supply and the input end of the drive chip U1, the other end of the resistor R8 is connected with one end of the capacitor C1, the other end of the capacitor C1 and the other end of the external power supply are grounded, and a motor is connected to the output end of the drive chip U1; through the circuit, the current ripple and peak value input to the motor can be greatly reduced, hardware is protected from being impacted by the peak, and the reliability of the hardware is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a motor drive circuit. Background Art

[0002] Motors are widely used in various electrical devices and can be used as a driving source to drive subsequent devices. For example, in a fan, the motor drives the fan blades to rotate. However, the motor requires a corresponding driving circuit to drive its operation. For example, the Chinese patent number CN209581288U, entitled "A Automobile Headlight Dimming Motor Controlled by PWM Signal", discloses that a voltage regulator diode ZD1 and a capacitor C3 are provided between the input end and the motor's adjustment circuit to perform filtering, thereby reducing the current ripple and peak value of the input to the motor. However, in this circuit, there is no resistor in the capacitor loop, and the filtering effect is relatively small, resulting in a still high current ripple and peak value of the input to the motor. Therefore, a new motor driving circuit is urgently needed to solve the above problems. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a motor drive circuit.

[0004] An embodiment of the present invention adopts a technical solution to solve its technical problem: a motor drive circuit, including a drive chip U1, a resistor R8 and a capacitor C1, one end of the resistor R8 is connected to one end of an external power supply and the input end of the drive chip U1 respectively, the other end of the resistor R8 is connected to one end of the capacitor C1, the other end of the capacitor C1 and the other end of the external power supply are grounded, and the motor is connected to the output end of the drive chip U1.

[0005] As one of the preferred embodiments of the present invention, a motor drive circuit further includes an inductor F1A, one end of the inductor F1A is connected to one end of the resistor R8 and the input end of the driver chip U1 respectively, and the other end of the inductor F1A is connected to one end of an external power supply.

[0006] As one of the preferred embodiments of the present utility model, a motor drive circuit also includes a transient voltage suppression diode TVS1, one end of the transient voltage suppression diode TVS1 is respectively connected to one end of the resistor R8, the input end of the driver chip U1 and one end of the external power supply, and the other end of the transient voltage suppression diode TVS1 and the other end of the external power supply are grounded.

[0007] As one of the preferred embodiments of the present invention, a motor drive circuit further includes a diode D1, wherein the anode of the diode D1 is connected to one end of the external power supply, and the cathode of the diode D1 is respectively connected to one end of the resistor R8 and the input end of the driver chip U1.

[0008] As one of the preferred embodiments of the present invention, the resistance value of the resistor R8 is set to 7.5Ω, and the capacitance value of the capacitor C1 is set to 4.7nF.

[0009] As one of the preferred embodiments of the present utility model, a motor driving circuit further includes a Hall sensor H1 connected to the input end of the driving chip U1.

[0010] The beneficial effects of the present invention are as follows: a motor drive circuit includes a drive chip U1, a resistor R8 and a capacitor C1, one end of the resistor R8 is respectively connected to one end of an external power supply and an input end of the drive chip U1, the other end of the resistor R8 is connected to one end of the capacitor C1, the other end of the capacitor C1 and the other end of the external power supply are grounded, and the motor is connected to the output end of the drive chip U1; the above circuit can greatly reduce the current ripple and peak value of the current input to the motor, protect the hardware from being impacted by spikes, and improve the hardware reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0012] Figure 1 The figure is a circuit schematic diagram of a motor drive circuit. DETAILED DESCRIPTION

[0013] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0014] In the description of this utility model, "above," "below," and "within" are understood to be exclusive of the number indicated, while "above," "below," and "within" are understood to be inclusive of the number indicated. The use of "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly specifying the number or order of the technical features indicated.

[0015] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0016] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection; internal communication between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0017] Reference Figure 1 A motor drive circuit includes a drive chip U1, a resistor R8 and a capacitor C1, one end of the resistor R8 is connected to one end of an external power supply and an input end of the drive chip U1 respectively, the other end of the resistor R8 is connected to one end of the capacitor C1, the other end of the capacitor C1 and the other end of the external power supply are grounded, and the motor is connected to the output end of the drive chip U1.

[0018] In the present invention, the motor is connected to pins 6 and 8 of the driver chip U1, one end of the external power supply is connected to one end of the resistor R8 and pin 5 of the driver chip U1 through the VIN terminal, one end of the external power supply is connected to the ground terminal through the VIN terminal, and the other end of the resistor R8 is connected to the ground terminal through the capacitor C1, so that the resistor R8 and the capacitor C1 constitute an RC filter circuit for filtering out the current ripple and peak value input to the motor; in one embodiment, the resistance value of the resistor R8 is set to 7.5Ω, and the capacitance value of the capacitor C1 is set to 4.7nF. Through reasonable numerical matching, the filtered current ripple and peak value can be maximized; the advantage of the present invention is that: the above circuit can greatly reduce the current ripple and peak value input to the motor, protect the hardware from spike impact, and improve hardware reliability.

[0019] In one embodiment, a motor driving circuit further includes an inductor F1A, one end of the inductor F1A is connected to one end of the resistor R8 and the input end of the driving chip U1 respectively, and the other end of the inductor F1A is connected to one end of an external power supply.

[0020] In one embodiment, a motor drive circuit further includes a transient voltage suppressor diode TVS1, one end of the transient voltage suppressor diode TVS1 is respectively connected to one end of the resistor R8, the input end of the driver chip U1, and one end of the external power supply, and the other end of the transient voltage suppressor diode TVS1 and the other end of the external power supply are grounded; by connecting the transient voltage suppressor diode TVS1 in parallel to the resistor R8 and the capacitor C1, the circuit is protected from the impact of transient high-voltage spike pulses (static electricity or lightning surges), thereby further reducing the current ripple and peak value of the current input to the motor.

[0021] In one embodiment, a motor drive circuit further includes a diode D1, wherein the anode of the diode D1 is connected to one end of an external power supply, and the cathode of the diode D1 is respectively connected to one end of a resistor R8 and an input end of a driver chip U1; and reverse connection protection is achieved by the diode D1.

[0022] In one embodiment, a motor driving circuit further includes a Hall sensor H1 connected to the input terminal of the driving chip U1, which is used to detect the number of rotations of the motor, thereby realizing the control of the motor rotation.

[0023] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A motor drive circuit, characterized in that: It includes a driving chip U1, a resistor R8 and a capacitor C1. One end of the resistor R8 is connected to one end of the external power supply and the input end of the driving chip U1 respectively, the other end of the resistor R8 is connected to one end of the capacitor C1, the other end of the capacitor C1 and the other end of the external power supply are grounded, and the motor is connected to the output end of the driving chip U1.

2. The motor drive circuit according to claim 1, wherein: An inductor F1A is also included. One end of the inductor F1A is connected to one end of the resistor R8 and the input end of the driver chip U1 respectively, and the other end of the inductor F1A is connected to one end of the external power supply.

3. The motor drive circuit according to claim 1, wherein: It also includes a transient voltage suppression diode TVS1, one end of the transient voltage suppression diode TVS1 is respectively connected to one end of the resistor R8, the input end of the driver chip U1 and one end of the external power supply, and the other end of the transient voltage suppression diode TVS1 and the other end of the external power supply are grounded.

4. The motor drive circuit according to claim 1, wherein: It also includes a diode D1 , an anode of the diode D1 is connected to one end of the external power supply, and a cathode of the diode D1 is connected to one end of the resistor R8 and an input end of the driver chip U1 .

5. The motor drive circuit according to claim 1, wherein: The resistance value of the resistor R8 is set to 7.5Ω, and the capacitance value of the capacitor C1 is set to 4.7nF.

6. The motor drive circuit according to claim 1, wherein: It also includes a Hall sensor H1 connected to the input terminal of the driver chip U1.

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