CN201383785Y

CN201383785Y - Control device of safe and reliable direct current brushless motor

Info

Publication number: CN201383785Y
Application number: CN200920009170U
Authority: CN
Inventors: 林立新
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-28
Filing date: 2009-04-03
Publication date: 2010-01-13
Anticipated expiration: 2019-04-03

Abstract

The utility model relates to a control device of a safe and reliable direct current brushless motor, which comprises a Hall position detection circuit, a main control chip and a power drive chip. The Hall position detection circuit is installed on a control panel at one end of the direct current brushless motor, can generate signals when being laid adjacent to a rotor, and is connected with the input end of the main control chip. The output end of the main control chip is connected with the input end of the power drive chip. The output end of the power drive chip is connected with the direct current brushless motor. The power end of the Hall position detection circuit is connected with a power supply time-delay switched circuit, or the earthing end of the Hall position detection circuit is connected with an earthing time-delay switched circuit. The control motor operation enabling end of the main control chip is connected with a motor working voltage and current real-time detection circuit. The control device can detect the working voltage and current of the direct current brushless motor in real time, has over-voltage and over-current protection functions, can prevent the power drive chip from being damaged, has long service life, and is safe and reliable.

Description

A kind of safe and reliable dc brushless motor control device

Technical field:

The utility model relates to a kind of control device, is specifically related to a kind of safe and reliable dc brushless motor control device.

Background technology:

Dc brushless motor is a kind of efficient height, noise is low, volume is little, the motor of good reliability, long service life, now be widely used in various household electrical appliance, wherein gas heater uses at most, because of the gas combustion of gas heater produces a large amount of pernicious gases, influence the healthy of people, even jeopardize people's life, need efflux by pipeline by ventilating fan, ventilating fan motor in the past mostly adopts alternating current machine, noise is big, the energy consumption height uses dc brushless motor just can improve properties of product greatly, not only energy-conservation but also environmental protection.But because the dc brushless motor control device is made up of electronic devices and components, add the defective of design, in gas heater production and use, be easy to generate the power drive IC that misoperation burns out control board, cause the maintenance of gas heater product to do over again, both increased product cost, also brought inconvenience to the user.

Summary of the invention:

Technical problem to be solved in the utility model is: solve the problem that above-mentioned prior art exists, and a kind of real-time detection dc brushless motor operating voltage and electric current, over-voltage over-current protection are provided, prevent that the power drive chip from damaging, safe and reliable dc brushless motor control device simultaneously.

The technical solution adopted in the utility model is: this dc brushless motor control device, comprise the hall position testing circuit, main control chip, the power drive chip, main control chip is connected with outer control unit by connector with the power drive chip, the hall position testing circuit is installed in dc brushless motor one end near on the control board of rotor, produce signal, connect the main control chip input, the main control chip output connects power drive chip input, the power drive chip output connects dc brushless motor, feature of the present utility model is: the power end at the hall position testing circuit inserts the power supply time delay circuit, perhaps the earth terminal at the hall position testing circuit inserts the ground connection time delay circuit, in the control motor rotation Enable Pin of main control chip, insert motor operating voltage real-time current detection circuit.

In the technique scheme, the power supply time delay circuit that inserts at hall position testing circuit power end is the combined type transistor switching circuit, the switch triode base stage that wherein connects hall position testing circuit power supply connects time-delay turn-on transistor collector electrode, and the base stage of time-delay turn-on transistor inserts rc-delay circuit.

In the technique scheme, the ground connection time delay circuit that inserts at hall position testing circuit earth terminal is the delay switch transistor circuit, and the base stage of triode connects rc-delay circuit, and the collector and emitter of triode connects Hall element underlying resistance and ground respectively.

In the technique scheme, the motor operating voltage electric current slowdown monitoring circuit that reflects in real time is made of two comparators, input "+" end of two comparators connects the standard electric pressure side and the normalized current end of resistor voltage divider circuit formation separately respectively, input "-" end of two comparators connects motor operating voltage sampling end and motor working current sampling end respectively, the current monitoring comparator output terminal connects "+" end that the voltage mirror is surveyed comparator by diode, and the voltage mirror is surveyed the control motor rotation Enable Pin that comparator output terminal connects main control chip.

Because prior art such as day the design's control circuit exists following significant disadvantages:

1, dc brushless motor electric current, voltage are not monitored, though the last underarm power tube sequential turn-on of main control chip IC1 energy power controlling chip for driving IC2, but when motor operating voltage increases, current of electric is also along with increase, electric current is during greater than the maximum of power drive chip IC 2, and IC2 just damages;

2, powering on shake or dial in heat and to insert, hall position detection signal instability, main control chip IC1 has unusual output, and what cause power drive chip IC 2 goes up the conducting simultaneously of underarm power tube on the same group, makes the IC2 damage.

The utility model is opened circuit at the power end or the earth terminal access delay of hall position testing circuit, control device is being powered on the incipient stage, the power supply of Hall element non-transformer, main control chip IC1 judges no position, the drive controlling end is output as " 0 ", close all power tubes of power drive chip IC 2, after control board powers on 500ms, connect the power supply of hall position testing circuit, main control chip IC1 determines motor position, order provides the motor rotation control signal, motor runs well, and like this, has both made when hot group of power on shake or connector are inserted, can can not damage by guaranteed output chip for driving IC2 yet, guarantee the motor long service life.

The utility model also constitutes motor operating voltage, the electric currents slowdown monitoring circuit that reflects in real time by two comparators; to the motor survey of reflecting in real time; overcurrent-overvoltage; main control chip IC1 no-output then; motor shuts down, and has effectively protected dc brushless motor, and is safe and reliable; make motor be in the normal operating conditions long service life all the time.

Description of drawings:

Fig. 1 is the utility model embodiment 1 circuit diagram

Fig. 2 is the utility model embodiment 2 circuit diagrams

Embodiment:

Referring to accompanying drawing, the utility model comprises hall position testing circuit H1, H2, H3, main control chip IC1, power drive chip IC 2, main control chip IC1 is connected with outer control unit by connector CON with power drive chip IC 2, hall position testing circuit H1, H2, H3 is installed in dc brushless motor one end near on the control board of rotor, the signal that produces connects main control chip IC1 input, main control chip IC1 output 11～16 pin connect power drive chip IC 2 inputs, power

drive chip output

3,7,10 pin connect dc brushless motor, power end at the hall position testing circuit inserts power supply time delay circuit GB2, GB1, RB1, RB2, CB, perhaps the earth terminal at the hall position testing circuit inserts ground connection time delay circuit GA, RA1, RA2, CA, at control motor rotation Enable Pin 10 pin of main control chip IC1, insert motor operating voltage real-time current detection IC circuit 3.The power supply time delay circuit that inserts at hall position testing circuit power end is the combined type transistor switching circuit, the switch triode GB2 base stage that wherein connects hall position testing circuit power supply connects time-delay turn-on transistor GB1 collector electrode, and the base stage of time-delay turn-on transistor inserts rc-delay circuit RB1, CB, RB2, GB1.The above-mentioned ground connection time delay circuit that inserts at hall position testing circuit earth terminal is the delay switch transistor circuit, the base stage of triode GA meets rc-delay circuit RA1, RA2, CA, and the collector and emitter of triode GA connects Hall element H3 and underlying resistance ground respectively.

The above-mentioned motor operating voltage electric current slowdown monitoring circuit IC3 that reflects in real time is made of two comparators, input "+" end of two comparators connects separately respectively, and resistor voltage divider circuit is R19, R20 and R16, standard electric pressure side and normalized current end that R17 constitutes, input "-" end of two comparators connects 1 pin of motor operating voltage sampling end IC2 respectively, R22, R21 and motor working current sampling end Rs, R18, C8,1 pin that the electric current mirror is surveyed comparator output terminal IC3 connects "+" end that voltage reflects and surveys comparator by diode D: 5 pin of IC3, voltage mirror are surveyed the control motor rotation Enable Pin of the 7 pin connection main control chip IC1 of comparator output terminal IC3: 10 pin of IC1.

As follows to two major technique feature divisions of the present utility model below:

One, control of the power supply of hall position testing circuit or ground connection control:

Referring to Fig. 1, insert the ground connection time delay circuit of forming by NPN pipe GA, resistance R A1, RA2, capacitor C A for 2 times in hall position detection branch resistance R.When+when the 12V power supply adds, since the effect of CA, not conducting of GA, Hall element H1, H2, H3 non-transformer are not worked, along with electric current charges to CA through RA1, CA voltage increases gradually, when the pipe of the GA such as voltage on CA base-on voltage, and the GA conducting, Hall element H1, H2, H3 work, this moment, IC1 entered stable state already, detected location status, export correct signal, when power supply disconnected, the CA electric charge discharged rapidly by GA, RA2, prepared for powering on next time.

Referring to Fig. 2, insert the power supply time delay circuit in hall position detection branch resistance R 1 upper end, it is by a PNP pipe GB2, a NPN pipe GB1, resistance R B1, RB2, RB3 and capacitor C B form, when+when the 12V power supply adds, because CB effect, GB1, not conducting of GB2, Hall element H1, H2, the H3 non-transformer is not worked, and along with circuit charges to CB through RB1, the last voltage of CB increases gradually, when the last voltage of CB equals the GB1 base-on voltage, GB1, the GB2 conducting, Hall element H1, H2, H3 work, this moment, IC1 entered stable state already, detect location status, the output correct signal.When power supply disconnected, the last electric charge of CB discharged rapidly by GB1, RB2, prepares for powering on next time.

Two, motor operating voltage, electric current are carried out the interlock survey of reflecting in real time:

Referring to Fig. 1, Fig. 2, it is made up of R16, R17, R18, R19, R20, R21, R22, RS, C8, C9, C10, diode D, IC3, and mirror is surveyed voltage ratio connects main control chip IC1 than amplifier out control motor rotation Enable Pin 10 pin.The voltage mirror is surveyed and is: between R19, R20 access+12V and the ground, set control motor operating voltage standard by electric resistance partial pressure, and insert voltage comparison amplifier "+" and hold the 5th pin, C9 is attempted by by the R20, motor operating voltage inserts voltage comparison amplifier " " end the 6th pin by R21, R22 dividing potential drop, C10 is attempted by by the R22, and C10 is the high frequency voltage shunt capacitance.When motor operating voltage in the setting scope, R22 and C10 voltage are lower than the voltage on R20 and the C9, comparison amplifier the 7th pin is output as height, and control motor rotation Enable Pin the 10th pin of IC1 is high, motor rotation, when motor operating voltage increases, the voltage of R22 and C10 increases, and this voltage is controlled voltage greater than established standards, and comparison amplifier IC3 the 7th pin is output as low, it is low promptly controlling the motor rotation Enable Pin, the motor stall.

The electric current mirror is surveyed and is: between R16, R17 access+12V and the ground, set the Control current standard by electric resistance partial pressure, insert the 3rd pin ("+" end) of voltage comparison amplifier IC3, motor working current flows through feedback resistance RS, produce a feedback voltage on RS, " one " that inserts comparison amplifier IC3 through R18 holds, i.e. the 2nd pin, simultaneously, connect high-frequency bypass capacitor C8.Output IC3 the 1st pin of comparison amplifier is connected to "+" end that mirror is surveyed the voltage comparison amplifier, i.e. the 5th pin of IC3 by diode D.When motor working current less than electric current is set, less than "+" end setting voltage, comparison amplifier is output as height at the RS feedback voltage, promptly IC3 the 1st pin be high, the control motor rotation Enable Pin of IC1 is a height, motor rotation.When motor working current greater than current value is set, the RS feedback voltage is greater than "+" end setting voltage, the comparison amplifier output is low, be that IC3 the 1st pin is low, by diode D C9 is discharged rapidly, comparison amplifier "+" end that makes mirror survey voltage is that IC3 the 5th pin voltage is lower than IC3 the 6th pin voltage, and comparison amplifier IC3 the 7th pin that mirror is surveyed voltage is output as low, the control motor rotation Enable Pin of IC1 is low, the motor stall.After the motor stall ,+12V power supply charges to C9 by R19, goes up voltage when C9 goes up voltage greater than C10, and mirror is surveyed the voltage comparison amplifier and is output as height, and the control motor rotation Enable Pin of IC1 is high, motor rotation.Proceed electric current and differentiate, need only motor working current less than the electric current of setting, motor remains in operation; As long as current of electric is greater than the electric current of setting, motor is worked at interval, and interlude is that R19 is to the C9 charging interval.

The element that the utility model adopts, IC1 is NJM2624, and IC2 is SMA6010, and IC3 is LM393.

Claims

1, a kind of safe and reliable dc brushless motor control device, comprise the hall position testing circuit, main control chip, the power drive chip, main control chip is connected with outer control unit by connector with the power drive chip, the hall position testing circuit is installed in dc brushless motor one end near on the control board of rotor, the signal that produces connects the main control chip input, the main control chip output connects power drive chip input, the power drive chip output connects dc brushless motor, it is characterized in that: the power end at the hall position testing circuit inserts the power supply time delay circuit, perhaps the earth terminal at the hall position testing circuit inserts the ground connection time delay circuit, in the control motor rotation Enable Pin of main control chip, insert motor operating voltage, the real-time current detection circuit.

2, according to the described safe and reliable dc brushless motor control device of claim 1, it is characterized in that the power supply time delay circuit that inserts at hall position testing circuit power end is the combined type transistor switching circuit, the switch triode base stage that wherein connects hall position testing circuit power supply connects time-delay turn-on transistor collector electrode, and the base stage of time-delay turn-on transistor inserts rc-delay circuit.

3, according to the described safe and reliable dc brushless motor control device of claim 1, it is characterized in that the ground connection time delay circuit that inserts at hall position testing circuit earth terminal is the delay switch transistor circuit, the base stage of triode connects rc-delay circuit, and the collector and emitter of triode connects Hall element underlying resistance and ground respectively.

4, safe and reliable dc brushless motor control device according to claim 1, it is characterized in that motor operating voltage, the electric current slowdown monitoring circuit that reflects in real time is made of two comparators, input "+" end of two comparators connects the standard electric pressure side and the normalized current end of resistor voltage divider circuit formation separately respectively, input "-" end of two comparators connects motor operating voltage sampling end and motor working current sampling end respectively, the current monitoring comparator output terminal connects "+" end that the voltage mirror is surveyed comparator by diode, and the voltage mirror is surveyed the control motor rotation Enable Pin that comparator output terminal connects main control chip.