CN209982371U

CN209982371U - Isolation control circuit of direct current motor

Info

Publication number: CN209982371U
Application number: CN201921043869.9U
Authority: CN
Inventors: 张剑
Original assignee: Shanghai Chengsa Electromechanical Technology Co Ltd
Current assignee: Shanghai Chengsa Electromechanical Technology Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-01-21
Anticipated expiration: 2029-07-05

Abstract

The utility model discloses a DC motor isolation control circuit, which comprises a linear voltage stabilizing circuit, a control chip minimum system circuit, an isolation circuit, a driving chip circuit and a motor back electromotive force preventing circuit; the linear voltage stabilizing circuit is connected with the control chip minimum system circuit; the isolation circuit is connected between the control chip minimum circuit and the drive chip circuit; the output end of the drive chip circuit is connected with the motor back electromotive force prevention circuit. The utility model discloses a control direct current motor open stop, switching-over, overcurrent protection's device, still increased the electrical isolation function, ensured the electrical isolation between the high-low pressure for this module operation is stable, and is durable, has realized direct current motor's automated control.

Description

Isolation control circuit of direct current motor

Technical Field

The utility model relates to a control circuit especially relates to a direct current motor isolation control circuit.

Background

Many applications require a large starting torque. The direct current motor has the characteristics of speed reduction and high torque. This makes it possible to handle applications with large starting torques and to easily absorb sudden changes in load. The rotational speed of the motor is adjustable to accommodate the load. Further, a dc motor is an ideal solution for achieving miniaturization. The motion control of the direct current motor not only relates to starting and stopping of the motor, but also comprises speed control, direction control, overcurrent protection and the like. In the aspect of traditional direct current motor control, the voltage division mode of a rheostat is mainly used for controlling the speed of the motor, and the mechanical switch operation is reversed to control the steering of the motor.

Because the mechanical control direct current motor is gradually eliminated, some technologies of electronic control direct current motors appear on the market at present, but most of the technologies are mainly controlled by a separating device, and a motor driving part circuit and a chip control part circuit use non-isolated circuits, so that once the driving part is abnormal, the high-voltage part has the possibility of burning out a control chip.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a direct current motor isolation control circuit for adopt non-isolation circuit among the solution prior art, lead to damaging the problem that the possibility is high.

The above object of the present invention is achieved by the following technical solutions:

a DC motor isolation control circuit comprises a linear voltage stabilizing circuit, a control chip minimum system circuit, an isolation circuit, a drive chip circuit and a motor back electromotive force preventing circuit; the linear voltage stabilizing circuit is connected with the control chip minimum system circuit; the isolation circuit is connected between the control chip minimum circuit and the drive chip circuit; the output end of the drive chip circuit is connected with the motor back electromotive force prevention circuit.

The isolation control circuit for the direct current motor comprises a linear voltage stabilizing circuit, a voltage stabilizing circuit and a control circuit, wherein the linear voltage stabilizing circuit comprises an input end and an output end, and a self-recovery fuse and a voltage stabilizer are connected between the input end and the output end.

The dc motor isolation control circuit as described above, wherein the isolation circuit comprises: a plurality of opto-coupler TLPs 521.

The isolated control circuit of the direct current motor, wherein the minimum system circuit of the control chip comprises: the control chip is STM8S903K3T 6.

The isolated control circuit of the direct current motor is characterized in that the control chip is connected with a power indicator lamp.

To sum up, owing to adopted above-mentioned technical scheme, the utility model discloses a control direct current motor open stop, switching-over, overcurrent protection's device, still increased the electrical isolation function, ensured the electrical isolation between the high-low pressure for this module operation is stable, and is durable, has realized direct current motor's automated control. The module can realize the electrical control of starting and stopping the motor at the running speed and running direction and the motor, can realize overcurrent protection and motor stalling protection, and also can electrically isolate a motor driving part circuit and a chip control part circuit, thereby ensuring the use safety of the module, realizing the automatic control of the direct current motor, taking the traditional mechanical control device as a notice and prolonging the service life of equipment.

Drawings

Fig. 1 is a circuit block diagram of the dc motor isolation control circuit of the present invention;

fig. 2 is a circuit diagram of a linear voltage stabilizing circuit of the dc motor isolation control circuit of the present invention;

fig. 3 is a minimum system circuit diagram of a control chip of the dc motor isolation control circuit of the present invention;

fig. 4 is a circuit diagram of the isolation circuit and the driving chip circuit of the dc motor isolation control circuit of the present invention;

fig. 5 is a circuit diagram of the anti-motor back electromotive force circuit of the dc motor isolation control circuit of the present invention.

Detailed Description

The invention will be further described with reference to the following figures and examples:

fig. 1 is a circuit block diagram of the dc motor isolation control circuit of the present invention, please refer to fig. 1, which is a dc motor isolation control circuit, wherein the dc motor isolation control circuit comprises a linear voltage stabilizing circuit 5, a control chip minimum system circuit 1, an isolation circuit 2, a driving chip circuit 3, and a motor back electromotive force preventing circuit 4; the linear voltage stabilizing circuit 5 is connected with the control chip minimum system circuit 1; an isolation circuit 2 is connected between the control chip minimum circuit and the drive chip circuit 3; the output end of the driving chip circuit 3 is connected with a motor back electromotive force prevention circuit 4.

Fig. 2 is a circuit diagram of the linear voltage stabilizing circuit of the dc motor isolation control circuit of the present invention, please refer to fig. 2, further, the linear voltage stabilizing circuit 5 includes an input end, an output end, and a self-recovery fuse and a voltage stabilizer are connected between the input end and the output end.

Fig. 4 is a circuit diagram of the isolation circuit and the driver chip circuit of the dc motor isolation control circuit of the present invention, please refer to fig. 4, and further, the isolation circuit 2 includes: a plurality of opto-coupler TLPs 521. In the figure, the optocoupler TLP521 is used for isolating two sides of the circuit, when the pin CH2 of the control chip outputs high level, the pin M1-L of the driving chip is high level, otherwise, the pin M1-L is low level. The R24 and R29 resistors are current limiting resistors, and when current passes through the resistors and the voltage drop exceeds 2V, the corresponding motor driving parts stop supplying power, so that the motor or the driving chip is prevented from being burnt out.

Fig. 3 is a circuit diagram of the minimum system of control chip of the dc motor isolation control circuit of the present invention, please refer to fig. 3, and further, the minimum system of control chip circuit 1 includes: and the control chip is STM8S903K3T 6. The control chip is STM8S903K3T6, and has a power indicator, a reset circuit and a programming debugging interface.

Furthermore, the control chip is connected with a power indicator lamp.

Fig. 5 is a circuit diagram of the anti-motor back electromotive force circuit of the dc motor isolation control circuit of the present invention. The two ends of the direct current motor are connected with the diode bridge, so that the voltage of motor pins of M1+, M1-, M2+ and M2-is clamped between 0-VS all the time, and the driving chip is prevented from being broken down by high voltage. For better electrical isolation, VCC and GND are powered by one set of power sources, and VS and AGND are powered by one set of power sources. Thus, better use effect can be achieved.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without inventive faculty, or through software programming. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A DC motor isolation control circuit is characterized by comprising a linear voltage stabilizing circuit, a control chip minimum system circuit, an isolation circuit, a driving chip circuit and a motor back electromotive force preventing circuit; the linear voltage stabilizing circuit is connected with the control chip minimum system circuit; the isolation circuit is connected between the control chip minimum circuit and the drive chip circuit; the output end of the drive chip circuit is connected with the motor back electromotive force prevention circuit.

2. The isolated control circuit of claim 1, wherein the linear voltage regulator circuit comprises an input terminal and an output terminal, and a self-recovery fuse and a voltage regulator are connected between the input terminal and the output terminal.

3. The dc motor isolation control circuit of claim 1, wherein the isolation circuit comprises: a plurality of opto-coupler TLPs 521.

4. The dc motor isolation control circuit of claim 1, wherein the control chip minimum system circuit comprises: the control chip is STM8S903K3T 6.

5. The isolated control circuit of the direct current motor according to claim 1, wherein the control chip is connected with a power indicator lamp.