CN209643032U - It is a kind of to remove stroboscopic driving circuit with defencive function - Google Patents

Abstract

The utility model relates to a kind of to remove stroboscopic driving circuit with defencive function; including rectification circuit, driving circuit and stroboscopic is gone to protect circuit; the rectification circuit input end is connected with external power supply; rectification circuit output end is connected with driving circuit; driving circuit output end is connected with stroboscopic protection circuit is removed; stroboscopic protection circuit output end is gone to be connected with LED light, the stroboscopic protection circuit that goes includes removing stroboscopic circuit and protection circuit.The utility model has the advantages that: it is equipped with protection circuit; it can be when going stroboscopic driving circuit to export terminal shortcircuit, in a short time to go stroboscopic chip to provide burning voltage, and keep voltage smoothly to decline as time went on; current-limit mode is avoided enter into, field-effect tube in circuit is protected.

Description

It is a kind of to remove stroboscopic driving circuit with defencive function

Technical field

The utility model relates to LED drive circuit more particularly to a kind of stroboscopic driving circuit is removed with defencive function.

Background technique

It is higher and higher to the performance requirement of LED drive device with the rapid development of LED industry, wherein to LED stroboscopic this A to require industry be increasingly to pay attention to, and serious stroboscopic has the eyesight of people very big injury, and the country wants stroboscopic now It asks also higher and higher, stroboscopic power is more and more gone to be generalized to market at present, mainly outstanding person Ward JW1221 removes stroboscopic chip Scheme commonly goes stroboscopic driving circuit when exporting terminal shortcircuit, removes the end the VIN electricity of stroboscopic chip JW1221 using the program Pressure moment is pulled low, and actual loading is connect again after output end sequential short circuit, since VIN does not have normal power supply, it is easy to enter limit Stream mode leads to all to be lost all consumption in the field-effect tube that the end VG with JW1221 is connected, the field-effect tube is caused to be generated heat Seriously, final damage.

Summary of the invention

The utility model mainly solves the above problem and provides one kind and can still maintain stroboscopic when exporting terminal shortcircuit The end the VIN voltage stabilization of chip JW1221 makes the end VIN of stroboscopic chip JW1221 power smooth in output end sequential short circuit Decline, which will not enter current-limit mode, cause what field-effect tube in circuit damaged to remove stroboscopic driving circuit with defencive function.

The technical scheme adopted by the utility model to solve the technical problem is as follows: a kind of go stroboscopic to drive with defencive function Dynamic circuit, including rectification circuit, driving circuit and stroboscopic is gone to protect circuit, the rectification circuit input end and external power supply phase Even, rectification circuit output end is connected with driving circuit, and driving circuit output end is connected with stroboscopic protection circuit is removed, and stroboscopic is gone to protect Circuit output end is connected with LED light.

The alternating current of external power supply is converted to direct current, the dc point that driving circuit exports rectification circuit by rectification circuit The constant-current supply for being converted to suitable LED light removes stroboscopic protection circuit removal LED stroboscopic, while stroboscopic driving circuit is removed in protection, keeps away Removing stroboscopic driving circuit from and entering current-limit mode when exporting terminal shortcircuit leads to component damage in circuit.

Scheme as a preference of the above scheme, the stroboscopic protection circuit that goes includes removing stroboscopic circuit and protection electricity Road, it is described go stroboscopic circuit include go stroboscopic chip US41, resistance RS62A, RS62B, RS62D, RS36A, RS36B, RS44A, nonpolarity capacitor CS62, CS63 and field-effect tube QS42, it is described go the first pin of stroboscopic chip US41 respectively with resistance RS62B first end is connected with nonpolar capacitor CS62 first end, and nonpolar capacitor CS62 second end is grounded SGND, resistance RS62B Second end is connected with resistance RS62A first end, and resistance RS62A second end is connected with resistance RS62D first end, resistance RS62D Two ends are connected with driving circuit output end and LED light anode respectively, go stroboscopic chip the second pin of US41 to be grounded SGND, remove stroboscopic Chip US41 third pin is connected with nonpolar capacitor CS63 first end, and nonpolar capacitor CS63 second end ground connection removes stroboscopic core The 4th pin of piece US41 connects field-effect tube QS42 grid, and the 5th pin of stroboscopic chip US41 is gone to connect field-effect tube QS42 source electrode respectively With resistance RS44A first end, resistance RS44A second end is grounded SGND, removes the 6th pin connecting resistance RS36A of stroboscopic chip US41 the One end, resistance RS36A the second terminating resistor RS36B first end, resistance RS36B second end respectively with field-effect tube QS42 drain electrode and LED light cathode is connected.

Scheme as a preference of the above scheme, the protection circuit include diode DS63, voltage-stabiliser tube ZS62, electricity RS62C, polar capacitor C63 and nonpolar capacitor CS62 are hindered, the diode DS63 cathode is managed with stroboscopic chip US41 first is removed Foot is connected, and diode DS63 anode is connected with resistance RS62C first end and polar capacitor C63 anode respectively, resistance RS62C second End is connected with resistance RS62A first end and resistance RS62B second end respectively, polar capacitor C63 minus earth SGND, the pressure stabilizing Pipe ZS62 cathode is connected with the first pin of stroboscopic chip is removed, voltage-stabiliser tube ZS62 plus earth SGND.In normal work, polarity electricity Hold C62 charging, when going stroboscopic drive output short circuit, polar capacitor C62 is that stroboscopic chip US41 is gone to power, and makes stroboscopic core Voltage keeps stable in a short time at the first pin of piece US41, declines voltage smoothly later, avoids enter into current-limit mode, from And protect field-effect tube QS42.

Scheme as a preference of the above scheme, the driving circuit include driving chip US31, first resistor string Join circuit, second resistance series circuit, 3rd resistor series circuit, resistor coupled in parallel circuit, capacitor parallel circuit, resistance RS63, RS33A, RS33B, diode DS61, DS33, D41A, D41B, nonpolar capacitor CS61, CS32, CS35, CS41, inductance L41B, L41A and field-effect tube QS41, first pin of driving chip US31 are connected with nonpolar capacitor CS32 first end, nonpolarity Capacitor CS32 second end is grounded GND, and the second pin of driving chip US31 is electric with nonpolar capacitor CS35 first end and second respectively Hinder series circuit first end be connected, second resistance series circuit second end respectively with inductance L41B first end and resistance RS63 first End is connected, and inductance L41B second end is grounded GND, and resistance RS63 second end is connected with diode DS61 anode, diode DS61 yin Pole is connected with first resistor series circuit first end, and first resistor series circuit second end is connected with rectification circuit output end, drives Dynamic chip US31 third pin distinguishes circuit first end, nonpolar capacitor CS41 first end and field-effect tube QS41 in parallel with a resistor Source electrode is connected, and resistor coupled in parallel circuit second end is grounded GND, and nonpolar capacitor CS41 second end is leaked with field-effect tube QS41 respectively Pole, diode D41B anode, diode D41A anode are connected with inductance L41A first end, inductance L41A second end respectively with rectification Circuit output end, capacitor parallel circuit first end, 3rd resistor series circuit first end are connected with ground SGND, diode D41A yin Pole respectively with capacitor parallel circuit second end, 3rd resistor series circuit second end and go stroboscopic protection circuit in resistance RS62D Second end be connected, diode D41B cathode is connected with diode D41A cathode, the 5th pin of driving chip US31 respectively with resistance RS33A first end is connected with diode DS33 cathode, resistance RS33A second end respectively with diode DS33 anode and resistance RS33B first end is connected, and resistance RS33B second end is connected with field-effect tube QS41 grid, the 6th pin of driving chip US31 point It is not connected with first resistor series circuit first end and nonpolar capacitor CS61 first end, nonpolar capacitor CS61 second end ground connection The 8th pin of GND, driving chip US31 is grounded GND.

Scheme as a preference of the above scheme, the first resistor series circuit include the resistance being connected in series RS61A, RS61B and RS61C.

Scheme as a preference of the above scheme, the second resistance series circuit include the resistance being connected in series RS35A and RS36B.

Scheme as a preference of the above scheme, the 3rd resistor series circuit include the resistance being connected in series RS43A and RS43B.

Scheme as a preference of the above scheme, the resistor coupled in parallel circuit include the resistance RS41A being connected in parallel, RS41B, RS41C, RS41D, RS41E and RS41F.

Scheme as a preference of the above scheme, the capacitor parallel circuit include the polar capacitor being connected in parallel C41A, C41B, C41C, C41D and C41E, the anode of above-mentioned each polar capacitor are the first end of capacitor parallel circuit, Ge Geji Property capacitor cathode be capacitor parallel circuit second end.

The utility model has the advantages that: it is equipped with protection circuit, it can be when going stroboscopic driving circuit to export terminal shortcircuit, in short-term In for stroboscopic chip is gone to provide burning voltage, and as time went on holding voltage smoothly decline, avoid enter into current-limit mode, Protect field-effect tube in circuit.

Detailed description of the invention

Fig. 1 is a kind of connection block diagram of the utility model.

Fig. 2 is a kind of circuit connection schematic diagram of the utility model.

1- rectification circuit 2- driving circuit 3- goes stroboscopic to protect circuit 4- external voltage 5-LED lamp.

Specific embodiment

Below with reference to the embodiments and with reference to the accompanying drawing being further described to the technical solution of the utility model.

Embodiment:

The present embodiment is a kind of to remove stroboscopic driving circuit with defencive function, as shown in Figure 1, including rectification circuit 1, driving Circuit 2 and stroboscopic is gone to protect circuit 3, the rectification circuit input end is connected with external power supply 4, rectification circuit output end with drive Circuit is connected, and driving circuit output end is connected with stroboscopic protection circuit is removed, and stroboscopic protection circuit output end is gone to be connected with LED light 5.

The stroboscopic protection circuit that goes includes removing stroboscopic circuit and protection circuit, as shown in Fig. 2, described goes stroboscopic electric Road include go stroboscopic chip US41, resistance RS62A, RS62B, RS62D, RS36A, RS36B, RS44A, nonpolar capacitor CS62, CS63 and field-effect tube QS42, it is described go the first pin of stroboscopic chip US41 respectively with resistance RS62B first end and nonpolarity electricity Hold CS62 first end to be connected, nonpolar capacitor CS62 second end is grounded SGND, resistance RS62B second end and resistance RS62A first End is connected, and resistance RS62A second end is connected with resistance RS62D first end, and resistance RS62D second end is exported with driving circuit respectively End is connected with LED light anode, goes stroboscopic chip the second pin of US41 to be grounded SGND, removes stroboscopic chip US41 third pin and non-pole Property capacitor CS63 first end be connected, nonpolar capacitor CS63 second end ground connection goes the 4th pin of stroboscopic chip US41 to connect field-effect Pipe QS42 grid goes the 5th pin of stroboscopic chip US41 to connect field-effect tube QS42 source electrode and resistance RS44A first end, resistance respectively RS44A second end is grounded SGND, goes the 6th pin connecting resistance RS36A first end of stroboscopic chip US41, and resistance RS36A second is terminated Resistance RS36B first end, resistance RS36B second end are connected with field-effect tube QS42 drain electrode and LED light cathode respectively.

The protection circuit includes diode DS63, voltage-stabiliser tube ZS62, resistance RS62C, polar capacitor C63 and nonpolarity Capacitor CS62, the diode DS63 cathode are connected with stroboscopic chip the first pin of US41 is removed, diode DS63 anode respectively with Resistance RS62C first end is connected with polar capacitor C63 anode, resistance RS62C second end respectively with resistance RS62A first end and electricity It hinders RS62B second end to be connected, polar capacitor C63 minus earth SGND and removes stroboscopic chip first at the voltage-stabiliser tube ZS62 cathode Pin is connected, voltage-stabiliser tube ZS62 plus earth SGND.

The driving circuit includes driving chip US31, first resistor series circuit, second resistance series circuit, third Resistance series circuit, resistor coupled in parallel circuit, capacitor parallel circuit, resistance RS63, RS33A, RS33B, diode DS61, DS33, D41A, D41B, nonpolar capacitor CS61, CS32, CS35, CS41, inductance L41B, L41A and field-effect tube QS41, the driving The first pin of chip US31 is connected with nonpolar capacitor CS32 first end, and nonpolar capacitor CS32 second end is grounded GND, drives core The second pin of piece US31 is connected with nonpolar capacitor CS35 first end and second resistance series circuit first end respectively, second resistance Series circuit second end is connected with inductance L41B first end and resistance RS63 first end respectively, and inductance L41B second end is grounded GND, Resistance RS63 second end is connected with diode DS61 anode, diode DS61 cathode and first resistor series circuit first end phase Even, first resistor series circuit second end is connected with rectification circuit output end, driving chip US31 third pin respectively with resistance Parallel circuit first end, nonpolar capacitor CS41 first end are connected with field-effect tube QS41 source electrode, resistor coupled in parallel circuit second end Be grounded GND, nonpolar capacitor CS41 second end respectively with field-effect tube QS41 drain electrode, diode D41B anode, diode D41A Anode is connected with inductance L41A first end, inductance L41A second end respectively with rectification circuit output end, capacitor parallel circuit first End, 3rd resistor series circuit first end be connected with ground SGND, diode D41A cathode respectively with capacitor parallel circuit second end, 3rd resistor series circuit second end with go stroboscopic protection circuit in resistance RS62D second end be connected, diode D41B cathode and Diode D41A cathode be connected, the 5th pin of driving chip US31 respectively with resistance RS33A first end and diode DS33 cathode It is connected, resistance RS33A second end is connected with diode DS33 anode and resistance RS33B first end respectively, resistance RS33B second end Be connected with field-effect tube QS41 grid, the 6th pin of driving chip US31 respectively with first resistor series circuit first end and non-pole Property capacitor CS61 first end be connected, nonpolar capacitor CS61 second end is grounded GND, and the 8th pin of driving chip US31 is grounded GND.

The first resistor series circuit includes resistance RS61A, RS61B and the RS61C being connected in series.

The second resistance series circuit includes the resistance RS35A and RS36B being connected in series.

The 3rd resistor series circuit includes the resistance RS43A and RS43B being connected in series.

The resistor coupled in parallel circuit include resistance RS41A, RS41B, RS41C, RS41D, the RS41E being connected in parallel and RS41F。

The capacitor parallel circuit includes polar capacitor C41A, C41B, C41C, C41D and the C41E being connected in parallel, on The anode for stating each polar capacitor is the first end of capacitor parallel circuit, and the cathode of each polar capacitor is capacitor parallel circuit Second end.

Voltage-stabiliser tube ZS62 uses 24V voltage-stabiliser tube in this implementation, goes stroboscopic chip US41 using JW1221 chip, when circuit just Often voltage is powered by resistance RS62A, RS62D, RS62B to the end chip VIN JW1221 when work, by nonpolar capacitor CS62 It is filtered to voltage at the end VIN, while being charged by resistance RS62C to polar capacitor C62, by diode DS63, flowed into The end VIN, due to there is 24V voltage-stabiliser tube, so the power supply of the end VIN is 24V when working normally.When exporting LED+, LED- short circuit, do not have There is voltage by RS62A, RS62B, RS62D, polar capacitor C63 is in discharge condition at this time, interior in short-term that the end VIN is given to provide stabilization Voltage maintains JW1221 VIN voltage gently to decline later, and sequential short circuit process can normally start after restoring at this time, will not enter Current-limit mode.

Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.

Claims (9)

1. a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: include rectification circuit (1), driving circuit (2) and Stroboscopic is gone to protect circuit (3), the rectification circuit input end is connected with external power supply (4), rectification circuit output end and driving electricity Road is connected, and driving circuit output end is connected with stroboscopic protection circuit is removed, and stroboscopic protection circuit output end is gone to be connected with LED light (5).

2. it is according to claim 1 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: described remove frequency Dodging protection circuit includes removing stroboscopic circuit and protection circuit, and the stroboscopic circuit that goes includes removing stroboscopic chip US41, resistance RS62A, RS62B, RS62D, RS36A, RS36B, RS44A, nonpolarity capacitor CS62, CS63 and field-effect tube QS42, it is described to go The first pin of stroboscopic chip US41 is connected with resistance RS62B first end and nonpolar capacitor CS62 first end respectively, nonpolarity electricity Hold CS62 second end and be grounded SGND, resistance RS62B second end is connected with resistance RS62A first end, resistance RS62A second end and electricity It hinders RS62D first end to be connected, resistance RS62D second end is connected with driving circuit output end and LED light anode respectively, removes stroboscopic core The second pin of piece US41 is grounded SGND, goes stroboscopic chip US41 third pin to be connected with nonpolar capacitor CS63 first end, non-pole Property capacitor CS63 second end ground connection, go the 4th pin of stroboscopic chip US41 to connect field-effect tube QS42 grid, remove stroboscopic chip US41 5th pin connects field-effect tube QS42 source electrode and resistance RS44A first end respectively, and resistance RS44A second end is grounded SGND, removes frequency Dodge the 6th pin connecting resistance RS36A first end of chip US41, resistance RS36A the second terminating resistor RS36B first end, resistance RS36B second end is connected with field-effect tube QS42 drain electrode and LED light cathode respectively.

3. it is according to claim 2 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: the protection Circuit includes diode DS63, voltage-stabiliser tube ZS62, resistance RS62C, polar capacitor C63 and nonpolar capacitor CS62, two pole Pipe DS63 cathode is connected with stroboscopic chip the first pin of US41 is removed, diode DS63 anode respectively with resistance RS62C first end and Polar capacitor C63 anode be connected, resistance RS62C second end respectively with resistance RS62A first end and resistance RS62B second end phase Even, polar capacitor C63 minus earth SGND, the voltage-stabiliser tube ZS62 cathode is connected with the first pin of stroboscopic chip is removed, voltage-stabiliser tube ZS62 plus earth SGND.

4. it is according to claim 1 or 2 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: described Driving circuit include driving chip US31, first resistor series circuit, second resistance series circuit, 3rd resistor series circuit, Resistor coupled in parallel circuit, capacitor parallel circuit, resistance RS63, RS33A, RS33B, diode DS61, DS33, D41A, D41B, non-pole Property capacitor CS61, CS32, CS35, CS41, inductance L41B, L41A and field-effect tube QS41, the driving chip US31 first manages Foot is connected with nonpolar capacitor CS32 first end, and nonpolar capacitor CS32 second end is grounded GND, the second pin of driving chip US31 It is connected respectively with nonpolar capacitor CS35 first end and second resistance series circuit first end, second resistance series circuit second end It is connected respectively with inductance L41B first end and resistance RS63 first end, inductance L41B second end is grounded GND, resistance RS63 second end It is connected with diode DS61 anode, diode DS61 cathode is connected with first resistor series circuit first end, first resistor series connection Circuit second end is connected with rectification circuit output end, driving chip US31 third pin difference circuit first end in parallel with a resistor, Nonpolar capacitor CS41 first end is connected with field-effect tube QS41 source electrode, and resistor coupled in parallel circuit second end is grounded GND, nonpolarity electricity Hold CS41 second end respectively with field-effect tube QS41 drain electrode, diode D41B anode, diode D41A anode and inductance L41A the One end be connected, inductance L41A second end respectively with rectification circuit output end, capacitor parallel circuit first end, 3rd resistor series electrical Road first end with ground SGND be connected, diode D41A cathode respectively with capacitor parallel circuit second end, 3rd resistor series circuit Second end with go stroboscopic protection circuit in resistance RS62D second end be connected, diode D41B cathode and diode D41A cathode phase Even, the 5th pin of driving chip US31 is connected with resistance RS33A first end and diode DS33 cathode respectively, resistance RS33A the Two ends are connected with diode DS33 anode and resistance RS33B first end respectively, resistance RS33B second end and field-effect tube QS41 grid Extremely be connected, the 6th pin of driving chip US31 respectively with first resistor series circuit first end and nonpolarity capacitor CS61 first end It is connected, nonpolar capacitor CS61 second end is grounded GND, and the 8th pin of driving chip US31 is grounded GND.

5. it is according to claim 4 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: described first Resistance series circuit includes resistance RS61A, RS61B and the RS61C being connected in series.

6. it is according to claim 4 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: described second Resistance series circuit includes the resistance RS35A and RS36B being connected in series.

7. it is according to claim 4 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: the third Resistance series circuit includes the resistance RS43A and RS43B being connected in series.

8. it is according to claim 4 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: the resistance Parallel circuit includes resistance RS41A, RS41B, RS41C, RS41D, RS41E and the RS41F being connected in parallel.

9. it is according to claim 4 it is a kind of remove stroboscopic driving circuit with defencive function, it is characterized in that: the capacitor Parallel circuit includes polar capacitor C41A, C41B, C41C, C41D and the C41E being connected in parallel, the sun of above-mentioned each polar capacitor The extremely first end of capacitor parallel circuit, the cathode of each polar capacitor are the second end of capacitor parallel circuit.