CN218124580U

CN218124580U - Direct current motor drive circuit

Info

Publication number: CN218124580U
Application number: CN202222151666.XU
Authority: CN
Inventors: 陈耀阳
Original assignee: Foshan Tuomi Electronic Technology Co ltd
Current assignee: Foshan Tuomi Electronic Technology Co ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-12-23
Anticipated expiration: 2032-08-16

Abstract

The utility model provides a DC motor drive circuit, drive circuit includes first controlled switch module, the controlled switch module of second, MOS pipe module and motor module, wherein: when a low level is input, the first controlled switch module is used for providing a grid driving voltage to turn on the MOS tube module, and the second controlled switch module is turned off; when a high level is input, the first controlled switch module is turned off, and the second controlled switch module is turned on and then pulls down the gate driving voltage to turn off the MOS tube module; MOS pipe module is used for control motor module work when inputing the low level, the utility model discloses a NPN type triode Q7 and PNP type triode Q8 of establishing ties constitute first controlled switch module, constitute the controlled switch module of second by NPN type triode Q4 for the grid voltage switching speed of MOS pipe module reduces standby power consumption, has solved the grid voltage switching speed of MOS pipe and has slower and the high problem of drive circuit standby power consumption.

Description

Direct current motor drive circuit

Technical Field

The utility model relates to a direct current motor technical field especially relates to a direct current motor drive circuit.

Background

The direct current motor is a motor which converts direct current into mechanical energy, and when the direct current motor works, the motor consists of a motor main body and a driver which drives the motor main body, wherein the control of torque, the output of position and the control of motor speed are all completed by the driver, and meanwhile, the driver performs common switching or PWM control on load current entering the motor, so that the desired motor working state is realized.

In the driver, a built-in driving circuit is needed, in the driving circuit, for a direct current motor driving circuit which directly controls an MOS transistor to control the on-off of a direct current motor, a pull-up resistor or a pull-down resistor must be used to maintain the gate clamping voltage of the MOS transistor, and the manner of maintaining the gate clamping voltage of the MOS transistor by using the pull-up resistor or the pull-down resistor causes the gate voltage switching speed of the MOS transistor to be slow (i.e., switching between working and standby), increases the power consumption of the direct current motor in standby, so that in a use environment with only battery power supply, the standby power consumption is high, and the power consumption speed of the battery is accelerated, so that the circuit is not suitable for a scene with battery power supply.

Therefore, it is necessary to provide a dc motor driving circuit to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a direct current motor drive circuit is used for solving the circuit that utilizes a triode drive MOS pipe and controls direct current motor's mode, because need utilize pull-up resistance or pull-down resistance to keep the grid clamping voltage of MOS pipe to cause the grid voltage switching speed of MOS pipe slower, the problem of the consumption when having increased the direct current motor standby.

The utility model provides a pair of direct current motor drive circuit, drive circuit includes first controlled switch module, the controlled switch module of second, MOS pipe module and motor module, wherein:

when a low level is input, the first controlled switch module is used for providing a grid driving voltage to turn on the MOS tube module, and the second controlled switch module is turned off;

when a high level is input, the first controlled switch module is turned off, and the second controlled switch module is turned on to pull down the grid driving voltage to turn off the MOS tube module;

the MOS tube module is used for controlling the motor module to work when a low level is input.

Preferably, the first controlled switch module includes an NPN-type triode Q7 and a PNP-type triode Q8 connected in series, wherein a collector of the triode Q7 is electrically connected to a base of the triode Q8, a collector of the triode Q8 is electrically connected to a gate of the MOS transistor module, and the base of the triode Q7 is connected to a power supply.

Preferably, the second controlled switch module includes an NPN transistor Q4 having a collector connected to the gate of the MOS transistor module, an emitter of the transistor Q4 is grounded, and a base electrically connected to the emitter of the transistor Q7.

Preferably, the driving circuit further comprises a current limiting module.

Preferably, the current limiting module comprises a current limiting resistor R36 with two ends connected between the collector of the transistor Q7 and the emitter of the transistor Q8, a current limiting resistor R35 and a current limiting resistor R26 which are connected in series with each other and connected between the emitter of the transistor Q7 and the base of the transistor Q4, a current limiting resistor R4 connected between the transistor Q4 and the MOS module, and a current limiting resistor R3 connected between the transistor Q8 and the MOS module.

Preferably, the driving circuit further includes a discharge resistor R17 for preventing the transistor Q1 from being turned on by the accumulated current when the motor module is in standby, wherein one end of the discharge resistor R17 is connected to the gate of the transistor Q1, and the other end is grounded.

Preferably, the driving circuit further comprises a sampling resistor R5 for collecting the working current of the motor module, wherein one end of the sampling resistor R5 is connected to the source electrode of the triode Q1, and the other end of the sampling resistor R5 is grounded together with the discharge resistor R17.

Preferably, the driving circuit further comprises a freewheeling diode D1 for preventing sudden current changes of the motor module, wherein the freewheeling diode D1 is connected in parallel to the motor module.

Compared with the prior art, the utility model provides a pair of DC motor drive circuit has following beneficial effect:

the utility model discloses a NPN type triode Q7 and PNP type triode Q8 of establishing ties constitute first controlled switch module, constitute the second controlled switch module by NPN type triode Q4, by first controlled switch module and the controlled switch module control MOS pipe module of second, by MOS pipe module control motor module work, the grid voltage switching speed of MOS pipe module has been accelerated, reduce standby power consumption, the mode of having solved single triode and need utilizing pull-up resistance or pull-down resistance to keep the grid clamp voltage of MOS pipe can cause the grid voltage switching speed of MOS pipe slower and increase the problem of direct current motor consumption.

Drawings

FIG. 1 is a circuit diagram of the working principle of the present invention;

fig. 2 is a schematic diagram of the working principle line frame of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

In a specific implementation process, as shown in fig. 2, the driving circuit is composed of a first controlled switch module, a second controlled switch module, a MOS transistor module, and a motor module, wherein:

In a specific implementation process, as shown in fig. 1, the first controlled switch module includes an NPN-type transistor Q7 and a PNP-type transistor Q8 that are connected in series, where a collector of the transistor Q7 is electrically connected to a base of the transistor Q8; a collector of the triode Q8 is electrically connected with a grid of the MOS transistor module to form a loop, and a base of the triode Q7 is connected with a 3.3V power supply (so that the base of the triode Q7 is always in a high level);

when the specific work is carried out, when a MOS _ EN port inputs a low level, the triode Q7 is conducted (because the voltage of a b electrode is greater than that of an e electrode), after the triode Q7 is conducted, the voltage of a collector electrode of the triode Q7 is pulled down, so that the voltage input into a base electrode of the triode Q8 is reduced, finally, the triode Q8 forms a low level input, the base electrode of the PNP type triode Q8 is conducted when the low level is input, after the conduction, the triode Q8 inputs a voltage which is greater than a grid opening voltage Vgs to a grid electrode of the MOS tube module, the MOS tube module is conducted, and the conducted MOS tube module controls the motor module;

when the MOS _ EN port inputs a high level, the triode Q7 is cut off (because the voltage of the b electrode is equal to the e electrode), after the triode Q7 is cut off, the voltage of the collector electrode of the triode Q7 is increased, so that the voltage input into the base electrode of the triode Q8 is increased, high-level input to the triode Q8 is formed, the base electrode of the PNP type triode Q8 is cut off when the high level is input, the triode Q8 forms a high-resistance state after the cut-off, and the MOS tube module is not controlled by the first controlled switch module any more.

In a specific implementation process, as shown in fig. 1, the second controlled switch module includes an NPN type triode Q4 whose collector is connected to the gate of the MOS transistor module, the emitter of the triode Q4 is grounded, and the base is electrically connected to the emitter of the triode Q7;

when the MOS _ EN port inputs low level, the NPN type triode Q4 is cut off, and the triode Q4 forms a high-resistance state after the cut-off, so that the second controlled module does not control the MOS tube module any more.

When the MOS _ EN port inputs a high level, the NPN type triode Q4 is conducted, so that the voltage of the collector of the triode Q4 is reduced, the voltage of the grid electrode of the MOS transistor module is reduced to be lower than the grid electrode starting voltage Vgs, the MOS transistor is cut off rapidly, and the motor is cut off.

In a specific implementation process, as shown in fig. 1, the driving circuit further includes a current limiting module, where the current limiting module includes a current limiting resistor R36 whose two ends are connected between a collector of the transistor Q7 and an emitter of the transistor Q8, a current limiting resistor R35 and a current limiting resistor R26 which are connected in series with each other and connected between the emitter of the transistor Q7 and a base of the transistor Q4, a current limiting resistor R4 connected between the transistor Q4 and the MOS transistor module, and a current limiting resistor R3 connected between the transistor Q8 and the MOS transistor module, where the current limiting resistor R36, the current limiting resistor R35, the current limiting resistor R26, the current limiting resistor R4, and the current limiting resistor R3 are used to limit a magnitude of a branch current in which the current limiting resistor R4 is located, so as to prevent the transistor in the corresponding series from being burned due to an excessive current.

The drive circuit further comprises a discharge resistor R17, one end of the discharge resistor R17 is connected to the grid of the triode Q1, the other end of the discharge resistor R17 is grounded, the discharge resistor R17 is used for discharging electricity for the base electrode of the MOS tube Q1, in the specific working process, the MOS _ EN is in a floating state in the standby process, the triodes Q7 and Q8 have small electric leakage, and in order to prevent the MOS tube Q1 from being opened by the voltage formed by accumulated leakage current, the discharge resistor R17 is used for consuming the leakage current.

The driving circuit further comprises a sampling resistor R5 used for collecting the working current of the motor module, wherein one end of the sampling resistor R5 is connected to the source electrode of the triode Q1, the other end of the sampling resistor R5 is grounded together with the discharge resistor R17, and when the driving circuit works, the sampling resistor R5 converts the current of the motor into voltage for sampling.

The driving circuit also comprises a fly-wheel diode D1 for preventing the current of the motor module from suddenly changing, wherein the fly-wheel diode D1 is connected on the motor module in parallel, and the fly-wheel diode D1 is used for preventing the motor module from being broken down or burnt out by induced voltage, so that high electromotive force generated by the motor module is consumed in a continuous current mode in a loop, and the motor driving module is protected from being damaged.

In this embodiment, the resistance of the current limiting resistor R36 is 22K Ω, the resistance of the current limiting resistor R35 is 2K Ω, the resistance of the current limiting resistor R26 is 2K Ω, the resistance of the current limiting resistor R4 is 50 Ω, the resistance of the current limiting resistor R3 is 50 Ω, the resistance of the discharge resistor R17 is 10K Ω, and the resistance of the sampling resistor R5 is 10m Ω.

The utility model provides a pair of DC motor drive circuit's theory of operation as follows: the utility model discloses a NPN type triode Q7 and PNP type triode Q8 of establishing ties constitute first controlled switch module, constitute the controlled switch module of second by NPN type triode Q4, by the controlled module control MOS pipe module of first controlled switch module and second, by the work of MOS pipe module control motor module, the grid voltage switching speed of MOS pipe module has been accelerated, reduce standby power consumption, the mode of having solved single triode and need utilizing pull-up resistance or pull-down resistance to keep the grid clamp voltage of MOS pipe can cause the grid voltage switching speed of MOS pipe slower and increase the problem of direct current motor consumption.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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 thus, should not be construed as limiting the present invention.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims

1. A DC motor driving circuit, characterized in that the driving circuit comprises a first controlled switch module, a second controlled switch module, a MOS tube module and a motor module, wherein:

when a low level is input, the first controlled switch module is used for providing a grid driving voltage to switch on the MOS tube module, and the second controlled switch module is switched off;

when a high level is input, the first controlled switch module is turned off, and the second controlled switch module is turned on and then pulls down the gate driving voltage to turn off the MOS tube module;

2. The dc motor driving circuit according to claim 1, wherein the first controlled switch module comprises an NPN transistor Q7 and a PNP transistor Q8 connected in series, wherein a collector of the transistor Q7 is electrically connected to a base of the transistor Q8, a collector of the transistor Q8 is electrically connected to a gate of the MOS transistor module, and a base of the transistor Q7 is connected to the power supply.

3. A dc motor driving circuit according to claim 2, wherein the second controlled switch module comprises an NPN transistor Q4 having a collector connected to the gate of the MOS transistor module, an emitter of the transistor Q4 being grounded, and a base electrically connected to the emitter of the transistor Q7.

4. A dc motor driving circuit according to claim 3, wherein the driving circuit further comprises a current limiting module.

5. A DC motor driving circuit according to claim 4, wherein the current limiting module comprises a current limiting resistor R36 connected between the collector of the transistor Q7 and the emitter of the transistor Q8, a current limiting resistor R35 and a current limiting resistor R26 connected in series with each other and connected between the emitter of the transistor Q7 and the base of the transistor Q4, a current limiting resistor R4 connected between the transistor Q4 and the MOS transistor module, and a current limiting resistor R3 connected between the transistor Q8 and the MOS transistor module.

6. A DC motor driving circuit according to claim 4, characterized in that the driving circuit further comprises a discharge resistor R17 for preventing the transistor Q1 from being conducted by the accumulated current when the motor module is in standby, wherein one end of the discharge resistor R17 is connected to the gate of the transistor Q1, and the other end is grounded.

7. The direct current motor driving circuit according to claim 6, further comprising a sampling resistor R5 for collecting the operating current of the motor module, wherein one end of the sampling resistor R5 is connected to the source of the transistor Q1, and the other end is grounded together with the discharge resistor R17.

8. A dc motor driving circuit according to claim 1, further comprising a freewheeling diode D1 for preventing current abrupt changes in the motor module, wherein the freewheeling diode D1 is connected in parallel to the motor module.