CN203492248U - DC-DC constant current driving circuit based on discrete device - Google Patents

DC-DC constant current driving circuit based on discrete device Download PDF

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Publication number
CN203492248U
CN203492248U CN201320660673.0U CN201320660673U CN203492248U CN 203492248 U CN203492248 U CN 203492248U CN 201320660673 U CN201320660673 U CN 201320660673U CN 203492248 U CN203492248 U CN 203492248U
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capacitor
resistance
triode
diode
ground connection
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CN201320660673.0U
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钱建斌
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SHANGHAI SUNLIGHT OPTO DEVICE CO Ltd
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SHANGHAI SUNLIGHT OPTO DEVICE CO Ltd
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Abstract

The utility model is a DC-DC constant current driving circuit based on a discrete device. The DC-DC constant current driving circuit comprises a power supply input terminal P1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a piezoresistor ZNR1, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first triode Q1, a second triode Q2, a third triode Q3, a fourth triode Q4, an inductor L1, and a light emitting diode LED1. According to the DC-DC constant current driving circuit, the discrete device is employed to form the constant current driving circuit, a constant current control chip in the prior art is replaced, the LED is driven by constant current, the cost is greatly and effectively reduced, and easy promotion and application can be achieved.

Description

DC-DC constant-current drive circuit based on discrete device
Technical field
The utility model relates to a kind of constant-current circuit, particularly discloses a kind of DC-DC constant-current drive circuit based on discrete device.
Background technology
The application of LED is more and more extensive, and LED itself be can be luminous diode, its many electrical characteristics are basic similar to diode, only its threshold voltage and forward conduction voltage larger than common diode.During LED forward conduction, very similar with the impedance operator of common diode, motional impedance is smaller, that is to say that small change in voltage can make curent change larger.So LED needs the circuit of an energy constant current to drive.And LED DC-DC drive circuit in the market all needs the special chip of the design of semiconductor producer to control, it is higher that the price of these chips has, and is unfavorable for promoting.
Summary of the invention
The purpose of this utility model is to overcome the defect existing in prior art, provides a kind of and can not only realize by constant current driven LED, can also be effectively cost-saving, be easy to promote and the practical DC-DC constant-current drive circuit based on discrete device.
The utility model is achieved in that a kind of DC-DC constant-current drive circuit based on discrete device, it is characterized in that: comprise the power input P1 with 2 pins, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, piezo-resistance ZNR1, the first diode D1, the second diode D2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, inductance L 1, LED 1,
A pin of described power input P1 is connected with described first one end of capacitor C 1, the positive pole of one end of piezo-resistance ZNR1, the first diode D1 respectively; Ground connection after the other end of described the first capacitor C 1 is connected with another pin of described power input P1; The other end ground connection of described piezo-resistance ZNR1; The negative pole of described the first diode D1 respectively with one end of described the second capacitor C 2, one end of one end of the 3rd capacitor C 3, the first resistance R 1, the emitter of the emitter of the first triode Q1, the second triode Q3, the collector electrode of the 3rd triode Q3 be connected,
The other end ground connection of described the second capacitor C 2, the other end ground connection of described the 3rd capacitor C 3, the other end of described the first resistance R 1 is connected with the base stage of described the first triode Q1, one end of one end of the 4th capacitor C 4, the 5th resistance R 5 respectively;
The collector electrode of described the first triode Q1 is connected with one end of described the second resistance R 2, the base stage of the second triode Q2 respectively, and the collector electrode of described the second triode Q2 is connected with the base stage of described the 3rd triode Q3, the other end ground connection of described the second resistance R 2;
The other end of described the 4th capacitor C 4 is connected with one end of described the 3rd resistance R 3, the emitter of described the 3rd triode Q3 respectively with the other end of described the 3rd resistance R 3, one end of the negative pole of the second diode D2, the 4th resistance R 4, one end of inductance L 1 be connected; The other end of described the 4th resistance R 4 is connected with one end of described the 7th capacitor C 7, ground connection after the other end of described the 7th capacitor C 7 is connected with the positive pole of described the second diode D2;
The other end of described inductance L 1 respectively with one end of described the 5th capacitor C 5, one end of one end of the 6th capacitor C 6, the 8th capacitor C 8, the negative pole of LED 1 be connected; The other end of described the 5th capacitor C 5 be connected with the other end of described the 6th capacitor C 6 after ground connection, the negative pole of described LED 1 respectively with the other end of described the 8th capacitor C 8, one end of one end of the 8th resistance R 8, the 7th resistance R 7, one end of the 6th resistance R 6 be connected; Ground connection after the other end of described the 8th resistance R 8 is connected with the other end of described the 7th resistance R 7; The other end of described the 6th resistance R 6 is connected with the base stage of described the 4th triode Q4, the grounded emitter of described the 4th triode Q4, and the collector electrode of described the 4th triode Q4 is connected with the other end of described the 5th resistance R 5.
Described the first diode D1 is anti-reverse diode.
Described the second capacitor C 2, the 3rd capacitor C 3, the 5th capacitor C 5, the 6th capacitor C 6 are filter capacitor.
The beneficial effects of the utility model are: adopt discrete device to build the utility model, not only realized by constant current driven LED, can also effectively save very large cost, be easy to promote and practicality.
Accompanying drawing explanation
Fig. 1 is the utility model circuit structure annexation schematic diagram.
Embodiment
According to Fig. 1, the utility model comprises the power input P1 with 2 pins, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, piezo-resistance ZNR1, the first diode D1, the second diode D2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, inductance L 1, LED 1.
A pin of described power input P1 is connected with described first one end of capacitor C 1, the positive pole of one end of piezo-resistance ZNR1, the first diode D1 respectively; Ground connection after the other end of described the first capacitor C 1 is connected with another pin of described power input P1; The other end ground connection of described piezo-resistance ZNR1; The negative pole of described the first diode D1 respectively with one end of described the second capacitor C 2, one end of one end of the 3rd capacitor C 3, the first resistance R 1, the emitter of the emitter of the first triode Q1, the second triode Q3, the collector electrode of the 3rd triode Q3 be connected.
The other end ground connection of described the second capacitor C 2, the other end ground connection of described the 3rd capacitor C 3, the other end of described the first resistance R 1 is connected with the base stage of described the first triode Q1, one end of one end of the 4th capacitor C 4, the 5th resistance R 5 respectively.
The collector electrode of described the first triode Q1 is connected with one end of described the second resistance R 2, the base stage of the second triode Q2 respectively, and the collector electrode of described the second triode Q2 is connected with the base stage of described the 3rd triode Q3, the other end ground connection of described the second resistance R 2.
The other end of described the 4th capacitor C 4 is connected with one end of described the 3rd resistance R 3, the emitter of described the 3rd triode Q3 respectively with the other end of described the 3rd resistance R 3, one end of the negative pole of the second diode D2, the 4th resistance R 4, one end of inductance L 1 be connected; The other end of described the 4th resistance R 4 is connected with one end of described the 7th capacitor C 7, ground connection after the other end of described the 7th capacitor C 7 is connected with the positive pole of described the second diode D2.
The other end of described inductance L 1 respectively with one end of described the 5th capacitor C 5, one end of one end of the 6th capacitor C 6, the 8th capacitor C 8, the negative pole of LED 1 be connected; The other end of described the 5th capacitor C 5 be connected with the other end of described the 6th capacitor C 6 after ground connection, the negative pole of described LED 1 respectively with the other end of described the 8th capacitor C 8, one end of one end of the 8th resistance R 8, the 7th resistance R 7, one end of the 6th resistance R 6 be connected; Ground connection after the other end of described the 8th resistance R 8 is connected with the other end of described the 7th resistance R 7; The other end of described the 6th resistance R 6 is connected with the base stage of described the 4th triode Q4, the grounded emitter of described the 4th triode Q4, and the collector electrode of described the 4th triode Q4 is connected with the other end of described the 5th resistance R 5.
The utility model course of work is as follows: during energising, the base voltage of the second triode Q2 is dragged down by the second resistance R 2, and the second triode Q2 conducting is gone in the second triode Q2 conducting, drives the 3rd triode Q3 conducting.Electric current is by following loop process, power input P1 → the first diode D1 → three triode Q3 → inductance L 1 → LED the 1 → seven resistance R 7 // eight resistance R 8 → ground connection.Owing to there being series inductance L1 in loop, so flowing through the electric current in this loop increases gradually, according to Ohm's law U=I*R, the voltage of the 7th resistance R 7 // eight resistance R 8 also increases gradually so, when this voltage increases, can make the 4th triode Q4 conducting, the 4th triode Q4 conducting meeting drags down the base voltage of the first triode Q1, now the first triode Q1 conducting, the first triode Q1 conducting will be drawn high the base voltage of the second triode Q2, now the second triode Q2 cut-off, after the second triode Q2 cut-off, the 3rd triode Q3 base stage no current drives, the 3rd triode Q3 also will end so.After the 3rd triode Q3 cut-off there is electric charge in inductance L 1, inductance L 1 is discharged by following loop, inductance L 1 → LED 1 → seven resistance R the 7 // eight resistance R 8 → the second diode D2 → inductance L 1, the electric current in inductance L 1 discharge process loop reduces gradually, according to the voltage of Ohm's law the 7th resistance R 7 // eight resistance R 8, also reduce gradually, when voltage is reduced to the cut-ff voltage of the 4th triode Q4, the 4th triode Q4 cut-off, after the 4th triode Q4 cut-off, the base voltage of the first triode Q1 will be drawn high by the first resistance R 1, the first triode Q1 cut-off, after the first triode Q1 cut-off, the base stage of the second triode Q2 is dragged down by the second resistance R 2 again, the second triode Q2 conducting again, the second triode Q2 conducting rear drive the 3rd triode Q3 conducting, electric current is passed through by following loop again, power input P1 → the first diode D1 → three triode Q3 → inductance L 1 → LED the 1 → seven resistance R 7 // eight resistance R 8 → ground connection, so switch can be controlled the current value of the LED 1 of flowing through, play constant current effect, in circuit, the first diode D1 is an anti-reverse diode, while preventing input by reversal connection, protective circuit is not damaged, piezo-resistance ZNR1 absorbs high-voltage pulse signal or the static of power input, the device of protective circuit is not damaged by these interference signals, the second capacitor C 2, the 3rd capacitor C 3 is filter capacitors of input, the ripple of filtering input, the 5th capacitor C 5, the 6th capacitor C 6 is filter capacitors of output, because inductance L 1 charge and discharge process current ripples is very large, output needs very large capacitance electric capacity to carry out filtering current ripples, make LED 1 avoid impacting.

Claims (3)

1. the DC-DC constant-current drive circuit based on discrete device, it is characterized in that: comprise the power input P1 with 2 pins, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, piezo-resistance ZNR1, the first diode D1, the second diode D2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, inductance L 1, LED 1,
A pin of described power input P1 is connected with described first one end of capacitor C 1, the positive pole of one end of piezo-resistance ZNR1, the first diode D1 respectively; Ground connection after the other end of described the first capacitor C 1 is connected with another pin of described power input P1; The other end ground connection of described piezo-resistance ZNR1; The negative pole of described the first diode D1 respectively with one end of described the second capacitor C 2, one end of one end of the 3rd capacitor C 3, the first resistance R 1, the emitter of the emitter of the first triode Q1, the second triode Q3, the collector electrode of the 3rd triode Q3 be connected,
The other end ground connection of described the second capacitor C 2, the other end ground connection of described the 3rd capacitor C 3, the other end of described the first resistance R 1 is connected with the base stage of described the first triode Q1, one end of one end of the 4th capacitor C 4, the 5th resistance R 5 respectively;
The collector electrode of described the first triode Q1 is connected with one end of described the second resistance R 2, the base stage of the second triode Q2 respectively, and the collector electrode of described the second triode Q2 is connected with the base stage of described the 3rd triode Q3, the other end ground connection of described the second resistance R 2;
The other end of described the 4th capacitor C 4 is connected with one end of described the 3rd resistance R 3, the emitter of described the 3rd triode Q3 respectively with the other end of described the 3rd resistance R 3, one end of the negative pole of the second diode D2, the 4th resistance R 4, one end of inductance L 1 be connected; The other end of described the 4th resistance R 4 is connected with one end of described the 7th capacitor C 7, ground connection after the other end of described the 7th capacitor C 7 is connected with the positive pole of described the second diode D2;
The other end of described inductance L 1 respectively with one end of described the 5th capacitor C 5, one end of one end of the 6th capacitor C 6, the 8th capacitor C 8, the negative pole of LED 1 be connected; The other end of described the 5th capacitor C 5 be connected with the other end of described the 6th capacitor C 6 after ground connection, the negative pole of described LED 1 respectively with the other end of described the 8th capacitor C 8, one end of one end of the 8th resistance R 8, the 7th resistance R 7, one end of the 6th resistance R 6 be connected; Ground connection after the other end of described the 8th resistance R 8 is connected with the other end of described the 7th resistance R 7; The other end of described the 6th resistance R 6 is connected with the base stage of described the 4th triode Q4, the grounded emitter of described the 4th triode Q4, and the collector electrode of described the 4th triode Q4 is connected with the other end of described the 5th resistance R 5.
2. the DC-DC constant-current drive circuit based on discrete device according to claim 1, is characterized in that: described the first diode D1 is anti-reverse diode.
3. the DC-DC constant-current drive circuit based on discrete device according to claim 1, is characterized in that: described the second capacitor C 2, the 3rd capacitor C 3, the 5th capacitor C 5, the 6th capacitor C 6 are filter capacitor.
CN201320660673.0U 2013-10-25 2013-10-25 DC-DC constant current driving circuit based on discrete device Active CN203492248U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104290651A (en) * 2014-09-29 2015-01-21 马瑞利汽车零部件(芜湖)有限公司 Steering lamp fault detection circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104290651A (en) * 2014-09-29 2015-01-21 马瑞利汽车零部件(芜湖)有限公司 Steering lamp fault detection circuit
CN104290651B (en) * 2014-09-29 2016-09-14 马瑞利汽车零部件(芜湖)有限公司 A kind of steering indicating light failure detector circuit

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