CN210608973U

CN210608973U - Motor driving circuit

Info

Publication number: CN210608973U
Application number: CN201921724012.3U
Authority: CN
Inventors: 刘强
Original assignee: Shenzhen C&D Electronics Co Ltd
Current assignee: Shenzhen C&D Electronics Co Ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-05-22
Anticipated expiration: 2029-10-14

Abstract

The utility model discloses a motor drive circuit relates to electronic circuit technical field. The motor driving circuit comprises a first switch circuit, a first relay circuit, a second switch circuit, a second relay circuit and a motor circuit, wherein the input end of the first switch circuit and the input end of the second switch circuit are used for inputting driving signals, the output end of the first switch circuit is connected with the input end of the first relay circuit, the output end of the second switch circuit is connected with the input end of the second relay circuit, and the output end of the first relay circuit and the output end of the second relay circuit are respectively connected with the negative pole and the positive pole of the motor circuit. The utility model discloses utilize switch circuit and relay circuit to realize the positive reversal of motor, the circuit is simple, and the cost is lower.

Description

Motor driving circuit

Technical Field

The utility model belongs to the technical field of the electronic circuit technique and specifically relates to a motor drive circuit is related to.

Background

At present, in a control circuit of an intelligent home (such as a massage bed/an intelligent curtain) and the like, a direct current motor circuit needs to realize positive and negative rotation driving so as to play a role in ascending and descending. However, most of the motor driving circuits at present have problems of high cost and complicated circuit, and need to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a motor drive circuit can realize the positive and negative rotation of motor through drive signal.

An embodiment of the utility model provides a motor drive circuit, including first switch circuit, first relay circuit, second switch circuit, second relay circuit and motor circuit, first switch circuit's input second switch circuit's input is used for the input drive signal, first switch circuit's output with first relay circuit's input is connected, second switch circuit's output with second relay circuit's input is connected, first relay circuit's output second relay circuit's output respectively with motor circuit's negative pole, anodal connection.

The utility model discloses motor drive circuit has following beneficial effect at least: the forward and reverse rotation of the motor is realized by utilizing the switch circuit and the relay circuit, the circuit is simple, and the cost is lower.

According to other embodiments of the present invention, the motor drive circuit further comprises a second switching circuit.

According to other embodiments of the present invention, the motor driving circuit further comprises a second switching circuit.

According to other embodiments of the present invention, the motor drive circuit further comprises a second relay circuit including a second diode and a second relay.

According to other embodiments of the present invention, a motor drive circuit includes a bidirectional suppressor diode and a motor.

According to other embodiments of the present invention, the first transistor and the second transistor are BC 817.

According to other embodiments of the present invention, the first diode and the second diode are IN 4007.

According to other embodiments of the present invention, the bidirectional suppressor diode is model number SMCJ30CAX 8.

Drawings

Fig. 1 is a block diagram of a motor driving circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a motor driving circuit according to an embodiment of the present invention.

Detailed Description

The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.

In the description of the present invention, if an orientation description is referred to, for example, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.

In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

Referring to fig. 1, a schematic structural diagram of a motor driving circuit in an embodiment of the present invention is shown. The method specifically comprises the following steps: first switch circuit, first relay circuit, second switch circuit, second relay circuit and motor circuit, first switch circuit's input the input of second switch circuit is used for inputing drive signal, first switch circuit's output with first relay circuit's input is connected, second switch circuit's output with second relay circuit's input is connected, first relay circuit's output the output of second relay circuit respectively with motor circuit's negative pole, anodal connection.

Referring to fig. 2, a specific circuit diagram of a motor driving circuit according to an embodiment of the present invention is shown. The first triode Q1, the first resistor R1 and the second resistor R2 form a first switch circuit;

the second triode Q2, the fourth resistor R4 and the fifth resistor R5 form a second switch circuit;

the first diode D1 and the first relay K1 form a first relay circuit;

the second diode D2 and the second relay K2 form a second relay circuit;

the third resistor R3, the bidirectional suppressor diode D3 and the motor M1 constitute a motor circuit.

Specifically, one end of a first resistor R1 is connected to the chip for inputting a driving signal (in this embodiment, the modulation signal PWM1), the other end of the first resistor R1 is connected to the base of the first transistor Q1 and one end of the second resistor R2, the other end of the second resistor R2 is grounded, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the anode of the first diode D1 and the 3-pin of the first relay K1, the cathode of the first diode D1, the 2-pin of the first relay K1, the 4-pin of the first relay K1 is connected to the power VCC, the 5-pin of the first relay K1 is grounded, the 1-pin of the first relay K1 is connected to one end of the third resistor R3, the bidirectional suppressor diode D3 and the motor M1 are connected in parallel and then connected to the other end of the third resistor R3, the 1-pin of the second relay K2, the 5-pin of the second relay K56 2, the cathode of the second diode D2, the second diode D364, a pin 4 of the second relay K2 and a pin 2 of the second relay K2 are connected to a power source VCC, a pin 3 of the second relay K2 and an anode of the second diode D2 are connected to a collector of the second triode Q2, an emitter of the second triode Q2 is grounded, a base of the second triode Q2 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is grounded, and the other end of the fourth resistor R4 is connected to a chip and used for inputting a driving signal (in the embodiment, the modulation signal PWM 2).

The working process of the circuit is as follows: in a standby state, no PWM driving signal is input to the base of the first triode Q1 and the base of the second triode Q2, the first triode Q1 and the second triode Q2 are in a cut-off state, and no driving voltage exists in the first relay K1 and the second relay K2. The electromagnetic valve is arranged between the

pins

2 and 3 of the first relay K1/the second relay K2, when no current flows through the coil between the

pins

2 and 3, the coil does not generate electromagnetic induction, the elastic sheet is normally closed, the

pins

1 and 5 of the first relay K1/the second relay K2 are communicated, and the pins 1 are also free of voltage due to the fact that the pins 5 are grounded, and the motor does not work.

When the base electrode of the first triode Q1 receives a driving signal PWM1 transmitted by a chip, the first triode Q1 is conducted, current flows through the 3 pin and the 2 pin of the first relay K1, the coil generates electromagnetic induction, the attraction elastic sheet is connected with the 1 pin and the 4 pin of the first relay K1, the voltage of the 1 pin is VCC as the 4 pin is connected with a power supply, the voltage of the 1 pin is VCC, the voltage of the two ends of the motor M1 is negative VCC at the moment, the positive pole is 0, and the motor M1 rotates reversely.

Similarly, when the base of the second transistor Q2 receives the driving signal PWM2 transmitted by the chip, the motor M1 rotates forward.

Referring to fig. 2, in the present embodiment, the types of the first transistor Q1 and the second transistor Q2 are BC 817.

IN this embodiment, the first diode D1 and the second diode D2 are IN4007, and function to prevent the reverse electromotive force from affecting the power source VCC.

In this embodiment, the bidirectional suppressor diode D3 is model number SMCJ30CAX8, and is used to prevent the motor M1 from being damaged due to too high voltage.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims

1. A motor driving circuit is characterized by comprising a first switch circuit, a first relay circuit, a second switch circuit, a second relay circuit and a motor circuit, wherein the input end of the first switch circuit and the input end of the second switch circuit are used for inputting driving signals, the output end of the first switch circuit is connected with the input end of the first relay circuit, the output end of the second switch circuit is connected with the input end of the second relay circuit, and the output end of the first relay circuit and the output end of the second relay circuit are respectively connected with the negative pole and the positive pole of the motor circuit.

2. The motor driving circuit as claimed in claim 1, wherein the first switching circuit comprises a first transistor.

3. A motor driving circuit as claimed in claim 2, wherein said second switching circuit comprises a second transistor.

4. A motor driving circuit according to claim 3, wherein said first relay circuit comprises a first diode and a first relay.

5. A motor drive circuit according to claim 4, wherein said second relay circuit comprises a second diode and a second relay.

6. A motor drive circuit according to claim 5, wherein the motor circuit comprises a bidirectional suppressor diode and a motor.

7. A motor driving circuit as claimed in any one of claims 3 to 6, wherein the first and second transistors are of type BC 817.

8. A motor driving circuit according to claim 5 or 6, wherein the first diode and the second diode are of type IN 4007.

9. The motor driving circuit as claimed in claim 6, wherein the bidirectional suppressor diode is model number SMCJ30CAX 8.