CN205212739U

CN205212739U - A drive circuit for fan head swinging motor

Info

Publication number: CN205212739U
Application number: CN201520224575.1U
Authority: CN
Inventors: 王敬; 冉建桥; 刘志成
Original assignee: SINOTECH MIXIC ELECTRONICS CO Ltd
Current assignee: SINOTECH MIXIC ELECTRONICS CO Ltd
Priority date: 2015-04-15
Filing date: 2015-04-15
Publication date: 2016-05-04
Anticipated expiration: 2025-04-15

Abstract

The utility model discloses a drive circuit for fan head swinging motor, including constant voltage power supply, control chip MCU, driver chip and load motor, driver chip contains first input end INA, second input INB, first output OA, second output OB, a low pressure logic control power end VCC, a power drive power end VDD, two ground ends, driver chip's input links to each other with control chip MCU, driver chip's output load motor links to each other, driver chip's logic power, control chip MCU's power link to each other with voltage -stabilized source output. Driver chip's power power end lug connection to power input port. The utility model provides a current drive circuit of the same kind, it is many to stand separately component count, the cost is higher, the crash rate is higher, and the integrated circuit degree hangs down, occupies the problem in great circuit board space.

Description

A kind of drive circuit for fan head swinging motor

Technical field

The utility model relates to circuit structure, is specifically related to the drive circuit of fan head swinging motor.

Background technology

In the drive circuit of existing fan head swinging motor, drive circuit all adopts discrete component to combine.The drive singal that control chip exports, by current-limiting resistance, then drives head-shaking motor through triode.Meanwhile, the impact that the inverse electromotive force produced for eliminating motor load brings triode and control chip, needs to arrange diode, for electric current afterflow.As shown in Figure 1, existing this drive circuit, discrete component quantity is many, and cost is higher, and failure rate is higher, and circuit level is low, takies larger board space.

Utility model content

The utility model provides a kind of drive circuit for fan head swinging motor, and the utility model solves existing similar drive circuit, and discrete component quantity is many, and cost is higher, and failure rate is higher, and circuit level is low, takies the problem of larger board space.

For solving the problem, the utility model adopts following technical scheme: a kind of drive circuit for fan head swinging motor, comprises stabilized voltage power supply, control chip MCU, driving chip and load motor; Described driving chip first input end INA, the second input INB, the first output OA, the second output OB, a low voltage logic controls power end VCC, a power driving power supply end VDD, two ground ends; First input end INA, the second input INB of described driving chip are connected with control chip MCU; First output OA, the second output OB of described driving chip are connected with load motor; The logic power of described driving chip, the power supply of control chip MCU export with stabilized voltage power supply and are connected.The power power-supply end of described driving chip is directly connected to power input port.

Described driving chip inside adopts PMOS as the high side switches of output power stage, adopts NMOS as output power stage lower edge switch.

Described driving chip adopts 8 pin SOP encapsulation, 8 pin DIP plastics or ceramic packaging.

Fan head swinging motor-drive circuit of the present utility model, driving chip inside possesses temperature protection function; Drive circuit is connected to control chip MCU, and the output of drive circuit is connected to load motor, and drive circuit is integrated into driving chip.Driving chip except possess highly integrated except, driving chip adds temperature protection function, prevents chip overheating from burning.

Accompanying drawing explanation

Fig. 1 is the utility model background technology fan head swinging motor-drive circuit schematic diagram, and in Fig. 1,100 represent stabilized voltage power supply, and 200 represent fan head swinging motor, and 300 represent controller chip;

Fig. 2 is circuit diagram of the present utility model, and in Fig. 2,100 represent that stabilized voltage power supply, 200 represents controller chip, and 300 represent driving chip, and 400 represent load motor;

Fig. 3 is the inner schematic diagram of driving chip in Fig. 2; In Fig. 3,500 represent temperature protection circuit;

Fig. 4 is the schematic diagram of temperature protection circuit in Fig. 3.

Embodiment

By best embodiment, the utility model is described in detail below.

As shown in Figure 2, a kind of drive circuit for fan head swinging motor, comprises stabilized voltage power supply, control chip MCU, driving chip and load motor; Described driving chip comprises first input end INA, the second input INB, the first output OA, the second output OB, and a low voltage logic controls power end VCC, a power driving power supply end VDD, two ground ends; First input end INA, the second input INB of described driving chip are connected with control chip MCU; First output OA of described driving chip is connected with load motor with the second output OB; The logic power of described driving chip, the power supply of control chip MCU export with stabilized voltage power supply and are connected.The power power-supply end of described driving chip is directly connected to power input port.Described driving chip inside adopts PMOS as the high side switches of output power stage, adopts NMOS as output power stage lower edge switch.Described driving chip adopts 8 pin SOP encapsulation, 8 pin DIP plastics or ceramic packaging.

As shown in Figure 3, a kind of specific implementation circuit of described driving chip, a series of gates in figure achieve the control of input signal to output signal, when chip temperature is in normal range (NR), input/output signal control planning is: 1, when the input signal of first input end INA is high, when the input signal of the second input INB is low, first output OA exports high level, second output OB output low level, electric current flows into motor by PMOS power tube P1 through the first output OA, the second output OB is flowed into by motor, Power Groud is flowed into from NMOS power switch N2, this current drives electric machine rotation.2, when the input signal of first input end INA is low, when the input signal of the second input INB is high, first output OA output low level, second output OB exports high level, electric current flows into motor by PMOS power tube P2 through the second output OB, flows into first input end INA by motor, flows into Power Groud from NMOS power tube N1, this sense of current and first input end INA are that high, the second input INB flows through motor when the being low sense of current is contrary, and therefore direction of motor rotation is also contrary.3, when first input end INA, the second input INB input signal are high simultaneously, PMOS power switch pipe P1, P2 end, NMOS power switch pipe N1, N2 conducting, and the first output OA and the second output OB exports as low, no current flows through motor, and motor does not rotate.4, when first input end INA, the second input INB input signal are low level simultaneously, power switch pipe P1, P2, N1, N2 are in cut-off state, and the first output OA and the second output OB exports tri-state, and same no current flows through motor, and motor does not rotate.

As shown in Figure 4, temperature protection circuit 500 controls by input signal a kind of specific implementation circuit of described driving chip internal temperature protection, and when two input signals are low level simultaneously, temperature protection circuit is inoperative, and circuit enters low-power consumption standby pattern.When being high level when there being any one input signal, temperature protection circuit normally works.When driving chip temperature is in normal level, temperature protection circuit output low level, does not affect normal input and output logic control.Once temperature anomaly, temperature protection circuit output state is changed to high level, and this level will turn off all power switch pipes immediately, cuts off the current path of motor, prevents continuation overheated.After cutting off current path, driving chip temperature declines, and after dropping to safety value, temperature protection circuit decision circuitry temperature return is normal, and output signal becomes low level again, now normally can control electric machine rotation.If motor is still in abnormality, chip temperature continues to raise, and exceed temperature protection point, temperature protection circuit can work again again, maintains the temperature of chip all the time a rational level, until load restoration is normal.

As shown in Figure 4, P1, P2, P3, P4 are pmos pipe, and N1, N2, N3 are nmos pipe.Start-up circuit is connected to the grid of N1; The drain electrode of the grid of the grid of P1 and drain electrode, P2, the grid of P3, the grid of P4 and N1 links together; The grid of N1, the grid of N2, the drain electrode of P2 and the collector electrode of NPN2 link together; The source electrode of N1 is connected to the collector electrode of NPN1; The emitter of NPN1 connects R1 to ground; The source electrode of the base stage of NPN1, the base stage of NPN2 and N2 links together, then connects R2 to ground; Drain series 3 resistance R5, R4, R3 of P3 are to ground; The drain electrode of P4 is connected to the collector electrode of NPN3.

When circuit powers on, start-up circuit generation current impulses injection is in PTAT current generating circuit, and after normal work, P3 and P4 all can export the PTAT electric current with PTAT.Because the EB junction voltage of NPN3 is negative temperature characteristic, along with the rising EB junction voltage of temperature reduces gradually, after temperature is elevated to design load, the reference voltage that the EB junction voltage of NPN3 produces on R4 lower than PTAT electric current, NPN enters saturation operation mode, and its collector voltage transfers low level to by high level.This level, through Schmidt trigger shaping, produces final output signal.

When after generation overheat protector event, N3 turns off, and NPN3 base voltage promotes, and temperature must drop to certain degree, and NPN3 just can reenter cut-off state.

Last it is noted that obviously, above-described embodiment is only for the utility model example is clearly described, and the restriction not to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And thus the apparent change of amplifying out or variation be still among protection range of the present utility model.

Claims

1. for a drive circuit for fan head swinging motor, it is characterized in that: comprise stabilized voltage power supply, control chip MCU, driving chip and load motor; Described driving chip comprises first input end INA, the second input INB, the first output OA, the second output OB, and a low voltage logic controls power end VCC, a power driving power supply end VDD, two ground ends; First input end INA, the second input INB of described driving chip are connected with control chip MCU; First output OA of described driving chip is connected with load motor with the second output OB; The logic power of described driving chip, the power supply of control chip MCU export with stabilized voltage power supply and are connected.

2. a kind of drive circuit for fan head swinging motor according to claim 1, is characterized in that: the power power-supply end of described driving chip is directly connected to power input port.

3. a kind of drive circuit for fan head swinging motor according to claim 1, is characterized in that: described driving chip inside adopts PMOS as the high side switches of output power stage, adopts NMOS as output power stage lower edge switch.

4. a kind of drive circuit for fan head swinging motor according to claim 1, is characterized in that: described driving chip adopts 8 pin SOP encapsulation, 8 pin DIP plastics or ceramic packaging.