CN106160599A

CN106160599A - A kind of drive circuit for fan head swinging motor

Info

Publication number: CN106160599A
Application number: CN201510174519.6A
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: 2015-04-14
Filing date: 2015-04-14
Publication date: 2016-11-23

Abstract

The invention discloses a kind of drive circuit for fan head swinging motor, relate to circuit structure, be specifically related to the drive circuit of fan head swinging motor.Including regulated power supply, control chip (MCU), driving chip and load motor；Described driving chip comprises two inputs (INA, INB), two outfans (OA, OB), and a low voltage logic controls power end (VCC), a power driving power supply end (VDD), two ground ends；The input of described driving chip is connected with control chip；The outfan load motor of described driving chip is connected；The logic power of described driving chip, the power supply of control chip are connected with regulated power supply output.The power power-supply end of described driving chip is directly connected to power input port.The present invention solves existing similar drive circuit, and discrete component quantity is many, relatively costly, and crash rate is higher, and circuit level is low, the problem taking bigger board space.

Description

A kind of drive circuit for fan head swinging motor

Technical field

The present invention relates to circuit structure, be 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 uses discrete component to be combined.The driving signal of control chip output, by current-limiting resistance, then drives head-shaking motor through audion.Meanwhile, the impact that audion and control chip are brought by the inverse electromotive force produced for eliminating motor load, need to arrange diode, for electric current afterflow.As it is shown in figure 1, existing this drive circuit, discrete component quantity is many, relatively costly, and crash rate is higher, and circuit level is low, takies bigger board space.

Summary of the invention

The present invention provides a kind of drive circuit for fan head swinging motor, and the present invention solves existing similar drive circuit, and discrete component quantity is many, relatively costly, and crash rate is higher, and circuit level is low, the problem taking bigger board space.

For solving the problems referred to above, the present invention adopts the following technical scheme that a kind of drive circuit for fan head swinging motor, including regulated power supply, control chip (MCU), driving chip and load motor；Described driving chip comprises two inputs (INA, INB), two outfans (OA, OB), and a low voltage logic controls power end (VCC), a power driving power supply end (VDD), two ground ends；The input (INA, INB) of described driving chip is connected with control chip (MCU)；The outfan (OA with OB) of described driving chip is connected with load motor；The logic power of described driving chip, the power supply of control chip are connected with regulated power supply output.The power power-supply end of described driving chip is directly connected to power input port.

Described driving chip is internal uses PMOS as the high side switches of output power stage, uses NMOS as output power stage lower edge switch.

Described driving chip uses SOP8 or DIP8 plastics or ceramic package.

The fan head swinging motor-drive circuit of the present invention, possesses temperature protection function inside driving chip；Drive circuit is connected to control chip, 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 in addition to, driving chip adds temperature protection function, prevents chip overheating from burning.

Accompanying drawing explanation

Fig. 1 is background of invention fan head swinging motor-drive circuit schematic diagram, and in Fig. 1,100 represent regulated power supply, and 200 represent fan head swinging motor, and 300 represent controller chip;

Fig. 2 is the circuit diagram of the present invention, and in Fig. 2,100 represent regulated power supply, 200 expression controller chips, and 300 represent driving chip, and 400 represent load motors；

The internal schematic diagram of driving chip in Fig. 3 Fig. 2；In Fig. 2,500 represent temperature protection circuit；

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

Detailed description of the invention

By optimal embodiment, the present invention is described in detail below。

As in figure 2 it is shown, a kind of drive circuit for fan head swinging motor, including regulated power supply, control chip (MCU), driving chip and load motor；Described driving chip comprises two inputs (INA, INB), two outfans (OA, OB), and a low voltage logic controls power end (VCC), a power driving power supply end (VDD), two ground ends；The input (INA, INB) of described driving chip is connected with control chip (MCU)；The outfan (OA with OB) of described driving chip is connected with load motor；The logic power of described driving chip, the power supply of control chip are connected with regulated power supply output.The power power-supply end of described driving chip is directly connected to power input port.Described driving chip is internal uses PMOS as the high side switches of output power stage, uses NMOS as output power stage lower edge switch.Described driving chip uses SOP8 or DIP8 plastics or ceramic package.

As shown in Figure 3, the one of described driving chip implements circuit, a series of gates in figure achieve the input signal control to output signal, and when chip temperature is in normal range, input/output signal control planning is: 1, when input signal INA is height, when INB is low, OA exports high level, OB output low level, and electric current is flowed into motor by PMOS power tube P1 through port OA, flows into port B by motor, flowing into Power Groud from NMOS power switch N2, this electric current drives electric machine rotation.2, it is low when input signal INA, when INB is high, OA output low level, OB exports high level, electric current is flowed into motor by PMOS power tube P2 through port OB, flows into port A by motor, flows into Power Groud from NMOS power tube N1, this sense of current is that the sense of current high, INB flows through motor when being low is contrary with INA, and therefore direction of motor rotation is the most contrary.3, when INA, INB input signal is high simultaneously, PMOS power switch pipe P1, P2 end, and NMOS power switch pipe N1, N2 turn on, OA and OB is output as low, and no current flows through motor, and motor does not rotates.4, when INA, INB input signal is low level simultaneously, power switch pipe P1, P2, N1, N2 export tri-state all in cut-off state, OA and OB, and same no current flows through motor, and motor does not rotates.

The one of described driving chip internal temperature protection implements circuit as shown in Figure 4, and temperature protection circuit 500 is by input signal control, 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 chip temperature is in normal level, temperature protection circuit output low level, do 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 immediately turn off all power switch pipes, cuts off the current path of motor, and it is overheated to prevent from continuing.After cutting off current path, chip temperature declines, and after dropping to safety value, temperature protection circuit decision circuitry temperature recovers normal, and output signal becomes low level again, now can normally control electric machine rotation.If motor is still within abnormality, chip temperature continues to raise, and exceedes temperature protection point, and temperature protection circuit can work again again, and the temperature of maintenance chip is 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 leakage of the grid of P1 and leakage, the grid of P2, the grid of P3, the grid of P4 and N1 links together；The colelctor electrode of the grid of N1, the grid of N2, the leakage of P2 and NPN2 links together；The source of N1 is connected to the colelctor electrode of NPN1；The emitter stage of NPN1 connects R1 to ground；The source of the base stage of NPN1, the base stage of NPN2 and N2 links together, and reconnects R2 to ground；The leakage of P3 connects 3 resistance R5, R4, R3 to ground；The leakage of P4 is connected to the colelctor electrode of NPN3.

During when circuit powers on, start-up circuit generation current impulse is injected into PTAT current generation circuit, after normal work, P3 and P4 all can export the PTAT current with PTAT.Owing to the EB junction voltage of NPN3 is negative temperature characteristic, along with the rising EB junction voltage of temperature is gradually lowered, after temperature is increased to design load, the reference voltage that the EB junction voltage of NPN3 produces on R4 less than PTAT current, NPN enters saturation operation mode, and its collector voltage is transferred to low level by high level.This level, through Schmidt trigger shaping, produces final output signal.

After there is 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.

It is last that it is noted that obviously above-described embodiment is only for clearly demonstrating example of the present invention, and not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus amplified out or variation still in protection scope of the present invention among.

Claims

1. the drive circuit for fan head swinging motor, it is characterised in that include regulated power supply, control chip (MCU), driving chip and load motor；Described driving chip comprises two inputs (INA, INB), two outfans (OA, OB), and a low voltage logic controls power end (VCC), a power driving power supply end (VDD), two ground ends；The input (INA, INB) of described driving chip is connected with control chip (MCU)；The outfan (OA with OB) of described driving chip is connected with load motor；The logic power of described driving chip, the power supply of control chip are connected with regulated power supply output.

2. the power power-supply end of driving chip described in is directly connected to power input port.

A kind of drive circuit for fan head swinging motor the most according to claim 1, it is characterised in that described driving chip is internal uses PMOS as the high side switches of output power stage, uses NMOS as output power stage lower edge switch.

A kind of drive circuit for fan head swinging motor the most according to claim 1, it is characterised in that described driving chip uses SOP8 or DIP8 plastics or ceramic package.

A kind of drive circuit for fan head swinging motor the most according to claim 1, it is characterized in that, the series of logical gates of driving chip achieves the input signal control to output signal, when chip temperature is in normal range, input/output signal control planning is: when input signal (INA) is height, (INB) when being low, (OA) output high level, (OB) output low level, electric current is flowed into motor by (PMOS) power tube (P1) through port (OA), port (B) is flowed into by motor, Power Groud is flowed into from NMOS power switch (N2), this electric current drives electric machine rotation；When input signal (INA) is low, (INB) when being high, (OA) output low level, (OB) output high level, electric current is flowed into motor by (PMOS) power tube (P2) through port (OB), port (A) is flowed into by motor, Power Groud is flowed into from (NMOS) power tube (N1), this sense of current and (INA) be high, (INB) flows through the sense of current of motor when being low contrary, therefore direction of motor rotation is the most contrary；When (INA, INB) input signal is high simultaneously, (PMOS) power switch pipe (P1, P2) cut-off, NMOS power switch pipe (N1, N2) turns on, and (OA and OB) is output as low, no current flows through motor, and motor does not rotates；When (INA, INB) input signal is low level simultaneously, power switch pipe (P1, P2, N1, N2) is all in cut-off state, and (OA and OB) exports tri-state, and same no current flows through motor, and motor does not rotates.

A kind of drive circuit for fan head swinging motor the most according to claim 4; it is characterized in that, described driving chip internal temperature protection circuit is by input signal control, 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 chip temperature is in normal level, temperature protection circuit output low level, do 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 immediately turn off all power switch pipes, cuts off the current path of motor, and it is overheated to prevent from continuing.