CN208015619U - A kind of brushless dc machine actuating device reducing noise - Google Patents

Abstract

The utility model is related to a kind of brushless dc machine actuating devices reducing noise, including：Electrification reset circuit connects a bias generator；Bias generator output end connects a magnetic induction Hall voltage generator；Magnetic induction Hall voltage generator output end connects a chopper amplifier；Chopper amplifier output end connects a comparator；Comparator output terminal connects a logic controller；Logic controller input terminal is connected with Thermal shutdown module and Pwm controller；Logic controller output end is connected with lock shutdown and restarts module, magnetic flux density control circuit and output function pin automatically；Pwm controller input terminal connects a pulse signal input pin.The utility model has the beneficial effects that：Simple in structure, small, production cost is low, and can efficiently solve noise problem when brshless DC motor commutation and startup.

Description

A kind of brushless dc machine actuating device reducing noise

Technical field

The utility model is related to a kind of driving devices, and in particular to a kind of brshless DC motor driving dress reducing noise It sets, belongs to technical field of integrated circuits.

Background technology

In current brshless DC motor using upper, either laptop heat-dissipation fan, brushless DC fan or single line Brshless DC motor fan is enclosed, in commutation, current waveform is the current sound for falling again to ramp, thus will produce certain To cause noise pollution.And in start-up course, the noise generated due to switch vibration can equally cause noise pollution With the stability for influencing motor operating.

For this purpose, how to provide a kind of brushless dc machine actuating device that can solve the above problem is the utility model Research purpose.

Utility model content

In view of the above-mentioned problems, the utility model provides a kind of brushless dc machine actuating device reducing noise, pass through Increase pulse width modulation（PWM）The design for controlling Sofe Switch provides to reduce current sound when switch vibration and commutation The solution of low noise.

To solve prior art problem, technical solution used by the utility model is：

A kind of brushless dc machine actuating device reducing noise, including：Bias generator, magnetic induction Hall voltage hair Raw device, chopper amplifier, comparator, logic controller, Thermal shutdown module, lock shut down and restart module, pulse width tune automatically Controller, pulse signal input pin, output function pin, magnetic flux density control circuit and electrification reset circuit processed；Described Electrification reset circuit connects a bias generator；The bias generator output end connects a magnetic induction Hall voltage and occurs Device；The magnetic induction Hall voltage generator output end connects a chopper amplifier；The chopper amplifier output end connects Connect a comparator；The comparator output terminal connects a logic controller；The logic controller input terminal is connected with heat Turn off module and Pwm controller；The logic controller output end is connected with lock shutdown and restarts mould automatically Block, magnetic flux density control circuit and output function pin；The Pwm controller input terminal connects pulse letter Number input pin.

Further, the electrification reset circuit includes：Power supply, wire pin and builtin voltage, the volume of builtin voltage Constant voltage range is set as 1.8 ~ 6V.

Further, the magnetic flux density control circuit includes：Magnetic flux density output pin and magnetic flux density adjuster.

Further, the rated temperature range of the Thermal shutdown module is set as 20 ~ 125 DEG C of ﹣.

Further, the pulse signal input pin can also be substituted for DC voltage input pin, input direct-current Voltage range is set as 3.5 ~ 12.5V.

The utility model has the beneficial effects that：Simple in structure, small, production cost is low, and can efficiently solve brushless Noise problem when direct current generator commutates and starts.

Description of the drawings

Fig. 1 is the circuit diagram of the utility model.

Wherein：Bias generator 1, magnetic induction Hall voltage generator 2, chopper amplifier 3, comparator 4, logic controller 5, Thermal shutdown module 6, lock shutdown and module 7, Pwm controller 8, pulse signal input pin 9, defeated is restarted automatically Go out function pin 10, magnetic flux density control circuit 11, electrification reset circuit 12, power supply 13, wire pin 14, builtin voltage 15, Magnetic flux density output pin 16, magnetic flux density adjuster 17.

Specific implementation mode

In order to make those skilled in the art more understand the technical solution of the utility model, 1 pair of this reality below in conjunction with the accompanying drawings With novel for further analysis.

As shown in Figure 1, a kind of brushless dc machine actuating device reducing noise, including：Bias generator 1, magnetic strength Answer Hall voltage generator 2, chopper amplifier 3, comparator 4, logic controller 5, Thermal shutdown module 6, lock shutdown and automatic weight Open module 7, Pwm controller 8, pulse signal input pin 9, output function pin 10, magnetic flux density control circuit 11, electrification reset circuit 12, power supply 13, wire pin 14, builtin voltage 15, magnetic flux density output pin 16, magnetic flux density tune Save device 17；Electrification reset circuit 12 includes：Power supply 13, wire pin 14 and builtin voltage 15, the rated voltage of builtin voltage 15 Range is set as 1.8 ~ 6V；Electrification reset circuit 12 connects a bias generator 1；1 output end of bias generator connects a magnetic strength Answer Hall voltage generator 2；2 output end of magnetic induction Hall voltage generator connects a chopper amplifier 3；Chopper amplifier 3 is defeated Outlet connects a comparator 4；4 output end of comparator connects a logic controller 5；5 input terminal of logic controller is connected with hot pass Disconnected module 6 and Pwm controller 8；The rated temperature range of Thermal shutdown module 6 is set as 20 ~ 125 DEG C of ﹣；Logic control 5 output end of device processed is connected with lock shutdown and restarts module 7, magnetic flux density control circuit 11 and output function pin 10 automatically；Magnetic Flux density control circuit 11 includes：Magnetic flux density output pin 16 and magnetic flux density adjuster 17；Pwm controller 8 Input terminal connects a pulse signal input pin 9；Pulse signal input pin 9 can also be substituted for DC voltage input pin, Input direct-current voltage range is set as 3.5 ~ 12.5V.

Wherein：Electrification reset circuit 12：Slope and reset digital circuit are powered on for detecting.

Bias generator 1：Bias reference for providing accurate temperature and process sensltlvty ensures that integrated circuit is being advised Normal operation in fixed parameter.

Chopper amplifier 3：In order to obtain higher sensitivity, 3 structure design of chopper amplifier is used, is dynamically eliminated Offset and flicker noise.

Lock shuts down and restarts module 7 automatically：When built-in locked rotor protection will turn off coil current, when magnetic pole changes When, rotor is declined by mechanical blockage or rotating speed, and lock shutdown starts；When obstruction is removed, restarting automatically, fan is restarted, Reduce average stall current, prevents from overheating and damaging fan.

Magnetic flux density control circuit 11：If magnetic flux density is more than the threshold value of setting, by 17 turns of magnetic flux density adjuster To sinking, when threshold value of the magnetic flux density less than setting, output state is kept.

Pulse signal input pin 9：Pulse signal can be directly applied on pulse signal pin 9 by user, and pulse accounts for Then empty ratio will change fan speed by drive integrated circult.Signal frequency suggestion is in 200hz ~ 30khz.

The operation principle of the utility model：After magnetic induction Hall voltage generator 2 senses motor-field voltage, by copped wave Amplifier 3 passes to comparator 4 after amplifying, and the noise suppressed of switching hysteresis is provided by comparator 4, and signal is transmitted to logic Controller 5 switchs vibrating noise when reducing startup；When motor commutation, electricity is controlled by Pwm controller 8 and changed Machine speed, avoid the occurrence of current waveform be for ramp fall again caused by current sound noise problem.It is simple in structure, volume Small, production cost is low, and can efficiently solve noise problem when brshless DC motor commutation and startup, suitable for mass production.

Technical solution provided herein is described in detail above, embodiment used herein is to the application Principle and embodiment be expounded, the explanation of above example is served only for helping to understand the present processes and its core Thought；Meanwhile for those of ordinary skill in the art, according to the thought of the application, in specific implementation mode and application range Upper there will be changes, in conclusion the contents of this specification should not be construed as limiting the present application.

Claims (5)

1. a kind of brushless dc machine actuating device reducing noise, it is characterised in that：Including：Bias generator, magnetic induction Hall voltage generator, chopper amplifier, comparator, logic controller, Thermal shutdown module, lock shutdown with it is automatic restart module, Pwm controller, pulse signal input pin, output function pin, magnetic flux density control circuit and electrification reset electricity Road；The electrification reset circuit connects a bias generator；The bias generator output end connects a magnetic induction Hall Voltage generator；The magnetic induction Hall voltage generator output end connects a chopper amplifier；The chopper amplifier Output end connects a comparator；The comparator output terminal connects a logic controller；The logic controller input terminal It is connected with Thermal shutdown module and Pwm controller；The logic controller output end be connected with lock shutdown with it is automatic Restart module, magnetic flux density control circuit and output function pin；The Pwm controller input terminal connection one Pulse signal input pin.

2. a kind of brushless dc machine actuating device reducing noise according to claim 1, it is characterised in that：It is described Electrification reset circuit include：Power supply, wire pin and builtin voltage, the range of nominal tension of builtin voltage is set as 1.8 ~ 6V。

3. a kind of brushless dc machine actuating device reducing noise according to claim 1, it is characterised in that：It is described Magnetic flux density control circuit include：Magnetic flux density output pin and magnetic flux density adjuster.

4. a kind of brushless dc machine actuating device reducing noise according to claim 1, it is characterised in that：It is described The rated temperature range of Thermal shutdown module be set as 20 ~ 125 DEG C of ﹣.

5. a kind of brushless dc machine actuating device reducing noise according to claim 1, it is characterised in that：It is described Pulse signal input pin can also be substituted for DC voltage input pin, input direct-current voltage range is set as 3.5 ~ 12.5V。