CN201937399U

CN201937399U - DC brushless motor driving device with function of overhigh counter electromotive force protection

Info

Publication number: CN201937399U
Application number: CN201120045548XU
Authority: CN
Inventors: 李保民; 刘全兴
Original assignee: BEIJING YUNTONG HENGCHANG DRIVE TECHNOLOGY Co Ltd
Current assignee: BEIJING YUNTONG HENGCHANG DRIVE TECHNOLOGY Co Ltd
Priority date: 2011-02-23
Filing date: 2011-02-23
Publication date: 2011-08-17
Anticipated expiration: 2021-02-23

Abstract

The utility model discloses a DC brushless motor driving device with a function of overhigh counter electromotive force protection. The device comprises three protection modules, wherein each protection module is connected with a three-phase winding of a motor. The device introduces an inductance coil, a resistor and a reverse diode to realize the protection to the motor driving device. An inductor can relieve counter electromotive force generated by the motor; simultaneously, the inductance coil can serve as a passive power factor straightener to improve the efficiency of the driving device; and the driving device can suppress current break between a DC bus and a switching tube and filter clutters of the DC bus. Since the inductor can enable the driving device to slowly release when a power supply is suddenly cut off, the reverse diode can better help energy in the induction coil to release. Meanwhile, the resistor in series connection with the diode can reduce the impact to the reserve diode and help release the energy in the inductance coil, so that the capacitor is further protected.

Description

A kind of driven by Brush-Less DC motor device that has the too high protection of back electromotive force

Technical field

The utility model belongs to anti-high voltage protective technical field, is specifically related to a kind of driven by Brush-Less DC motor device that has the too high protection of back electromotive force.

Background technology

Along with the development of industrial automation technology, motor driver is used more and more wider, because it has good speed adjusting performance and obvious energy-saving effect, therefore is subjected to people's welcome in every field.Dc brushless motor is widely used in the every field as a kind of high efficiency motor, but dc brushless motor is prone to back electromotive force under the frequent situation of start and stop; If the back electromotive force that occurs is too high, then burns out motor driver easily and cause its useful life short, the poor stability of system.The current influence that in drive unit, utilizes discharging and recharging of diode to eliminate the back electromotive force of motor generation usually, but this method effect is limited, then burns out diode easily when back electromotive force is too high simultaneously, and then influences the normal operation of system.

The utility model content

In view of this; the utility model provides a kind of driven by Brush-Less DC motor device that has the too high protection of back electromotive force; can prevent the too high problem that burns out drive unit of back electromotive force that dc brushless motor occurs when frequent start-stop or sudden power, strengthen the stability of driven by Brush-Less DC motor system.The realization the technical solution of the utility model is as follows:

A kind of driven by Brush-Less DC motor device that has the too high protection of back electromotive force comprises 3 protection modules, and each protection module links to each other with three passages of motor respectively;

Described protection module comprises two metal-oxide-semiconductors, is respectively first metal-oxide-semiconductor and second metal-oxide-semiconductor; 6 resistance are respectively first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance; 3 electric capacity are respectively first electric capacity, second electric capacity, the 3rd electric capacity; 3 diodes are respectively first diode, second diode, the 3rd diode; Inductance;

Wherein, modulation signal A links to each other with an end of second resistance, the other end of second resistance links to each other with the grid of first metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor links to each other with an end of inductance, an end of the 3rd resistance, an end of first electric capacity, an end of the 3rd electric capacity and the negative pole of the 3rd diode respectively, and the other end of the other end of first electric capacity and the 3rd resistance links to each other with the positive pole of first diode respectively; The negative pole of first diode links to each other with dc bus respectively with the other end of inductance; The other end virtual earth of the source electrode of second metal-oxide-semiconductor, the 3rd diode cathode and the 3rd electric capacity; One phase winding of motor links to each other respectively with the source electrode of first metal-oxide-semiconductor, an end of second electric capacity, the negative pole of second diode and the drain electrode of second metal-oxide-semiconductor with the 4th resistance by the 6th resistance, the other end ground connection of second electric capacity, the positive pole of second diode link to each other the back by first grounding through resistance with the source electrode of first metal-oxide-semiconductor; Modulation signal B links to each other with the grid of second metal-oxide-semiconductor by the 5th resistance.

Beneficial effect

According to above technical scheme as seen, the utility model is by the impact of inductance alleviation back electromotive force, by releasing of energy in backward diode and the resistance realization inductance coil; Use the useful life that the utility model can improve dc brushless motor, can improve the stability and the power factor of system simultaneously.

Description of drawings

Fig. 1 is a kind of driven by Brush-Less DC motor device schematic diagram that has the too high protection of back electromotive force of the utility model.

Fig. 2 is the schematic diagram of protection module in the utility model.

Embodiment

Below in conjunction with the accompanying drawing embodiment that develops simultaneously, the utility model is described in detail.

As shown in Figure 1, the utility model is abandoned single diode that adopts drive unit is protected, but in motor driver, introduces inductance coil (L1 among Fig. 1; L2, L3), resistance (R5 among Fig. 1, R11; R15) and the reversal connection diode (D1 among Fig. 1, D4, D8).Inductance can well be alleviated the back electromotive force that motor produces; Inductance can improve the efficient of driver as having no chance the power factor correction device simultaneously; Can suppress the current break between dc bus and the switching tube, the effect of filtering dc bus clutter.Because the existence of inductance makes driver release under the situation that sudden power takes place slowly, therefore this anti-phase diode can fine group group inductance in the releasing of energy.Simultaneously, resistance of series connection reduces the impact to electric capacity in the dc bus on diode, and then protection electric capacity.

As described in Figure 1, a kind of driven by Brush-Less DC motor device that has the too high protection of back electromotive force of the utility model comprises 3 protection modules, and each protection module links to each other with three phase windings of motor respectively; Three protection module structures are identical, below are that example describes with one of them protection module.

As shown in Figure 2, the protection module of motor FBB passage correspondence comprises two metal-oxide-semiconductors, is respectively the first metal-oxide-semiconductor Q_HB1 (IXTQ44N50P) and the second metal-oxide-semiconductor Q_LB1 (IXTQ44N50P); 6 resistance are respectively first resistance R 4 (0.02 Ω), second resistance R 9 (51 Ω), the 3rd resistance R 11 (2.4K Ω), the 4th resistance R 12 (200K Ω), the 5th resistance R 13 (51 Ω), the 6th resistance R 16 (200 Ω); 3 electric capacity are respectively first capacitor C 10 (10 ⁴PF), second capacitor C 13 (10 ⁴PF), the 3rd capacitor C 14 (4700PF); 3 diodes are respectively the first diode D4 (UF4007), the second diode D7 (UF4007), the 3rd diode D9 (UF4007); Inductance L 2 (uH60 Sendust Cores);

Wherein, input modulating signal HBout links to each other with the end of R9, the other end of R9 links to each other with the grid of Q_HB1, the drain electrode of Q_HB1 links to each other with an end of inductance L 2, the end of R11, the end of C10, the end of C14 and the negative pole of D9 respectively, and the other end of C10 links to each other with the positive pole of D4 respectively with the other end of R11; The negative pole of D4 links to each other with dc bus respectively with the other end of inductance L 2; The other end virtual earth of the source electrode of Q_LB1, D9 positive pole and C14; The FBB passage of motor links to each other respectively with the source electrode of Q_HB1, the end of C13, the negative pole of D7 and the drain electrode of Q_LB1 with R12 by R16, the other end ground connection of C13, and the positive pole of D7 links to each other the back by R4 ground connection with the source electrode of Q_HB1; Input modulating signal LB links to each other with the grid of Q_LB1 by R13.

Wherein, modulation signal HBout and modulation signal LB are respectively square wave PWM in the same protection module, and the modulation signal of HBout and LB is opposite.HBout phase place between the different protection modules is different, and the LB phase place between the different protection modules is different.

Third channel with motor is an example below, when the too high situation of back electromotive force appears in the motor third channel, this moment, too high back electromotive force starting point was i.e. FBC place among the figure at the winding joint place of motor, and the back electromotive force of this moment passes through the source electrode that R10 and R6 are added to metal-oxide-semiconductor Q_HC1.Owing to metal-oxide-semiconductor source voltage height this moment, so diode D5 conducting.Back electromotive force is added to the drain electrode end of metal-oxide-semiconductor through D5.This moment, the electric current of back electromotive force divided two-way to flow back to the capacitor of main circuit (being the dc bus circuit), one, be by magnet ring L1, because the effect that prevention electric current and voltage jump are arranged of magnet ring, so can suppress the influence of back electromotive force sudden change to devices such as main circuit electric capacity by magnet ring.Its two, be by resistance R 5 and diode D1, the electric current of back electromotive force also can effectively reduce the electromotive force sudden change influence to main circuit electric capacity etc. by resistance R 5.

After too high back electromotive force is gone over, generally also stored energy in the magnet ring, this moment, resistance R 5 and diode D1 can release to energy stored in the magnet ring, effectively protected magnet ring.Thereby guarantee the good of entire circuit.And existing circuit does not generally have magnet ring L1; resistance R 5 and diode D1 and capacitor C 6; when causing that because of motor frequent start-stop or sudden power back electromotive force is too high, the devices such as the big electric capacity of filtering of main circuit are impacted too big, be easy to burn devices such as the big electric capacity of filtering.Even have magnet ring also not have the storage power in resistance R 5 and diode D1 and the capacitor C 6 such magnet rings to can not get discharging timely, influence the work of system.

In sum, more than be preferred embodiment of the present utility model only, be not to be used to limit protection range of the present utility model.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. a driven by Brush-Less DC motor device that has the too high protection of back electromotive force comprises 3 protection modules, and each protection module links to each other with three phase windings of motor respectively;

Wherein, described protection module comprises two metal-oxide-semiconductors, is respectively first metal-oxide-semiconductor and second metal-oxide-semiconductor; 6 resistance are respectively first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance; 3 electric capacity are respectively first electric capacity, second electric capacity, the 3rd electric capacity; 3 diodes are respectively first diode, second diode, the 3rd diode; And inductance;

Wherein, PWMH modulation signal A links to each other with an end of second resistance, the other end of second resistance links to each other with the grid of first metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor links to each other with an end of inductance, an end of the 3rd resistance, an end of first electric capacity, an end of the 3rd electric capacity and the negative pole of the 3rd diode respectively, and the other end of the other end of first electric capacity and the 3rd resistance links to each other with the positive pole of first diode respectively; The negative pole of first diode links to each other with dc bus respectively with the other end of inductance; The other end virtual earth of the source electrode of second metal-oxide-semiconductor, the 3rd diode cathode and the 3rd electric capacity; One phase winding of motor links to each other respectively with the source electrode of first metal-oxide-semiconductor, an end of second electric capacity, the negative pole of second diode and the drain electrode of second metal-oxide-semiconductor with the 4th resistance by the 6th resistance, the other end ground connection of second electric capacity, the positive pole of second diode link to each other the back by first grounding through resistance with the source electrode of first metal-oxide-semiconductor; PWML modulation signal B links to each other with the grid of second metal-oxide-semiconductor by the 5th resistance.