CN203840610U - LED circuit having stand-by power source circuit - Google Patents

LED circuit having stand-by power source circuit Download PDF

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Publication number
CN203840610U
CN203840610U CN201420225538.8U CN201420225538U CN203840610U CN 203840610 U CN203840610 U CN 203840610U CN 201420225538 U CN201420225538 U CN 201420225538U CN 203840610 U CN203840610 U CN 203840610U
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Prior art keywords
circuit
led
control
resistance
npn type
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CN201420225538.8U
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Chinese (zh)
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刘进淼
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Changzhi City Hua Jie Electro-Optical Technology Inc (us) 62 Martin Road Concord Massachusetts 017
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Changzhi City Hua Jie Electro-Optical Technology Inc (us) 62 Martin Road Concord Massachusetts 017
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    • Y02B20/42

Abstract

The utility model relates to an LED circuit having a stand-by power source circuit and belongs to the technical field of LED circuits. The LED circuit having the stand-by power source circuit solves the problem of how to provide the LED circuit which is simple in structure, capable of providing a stable electric current to an LED, capable of working normally after an LED light source is disconnected and provided with a stand-by power source circuit. The adopted technical solution is that the LED circuit comprises a power source circuit, a driving circuit, a switch control circuit, an LED illuminating circuit and a stand-by power source circuit, wherein electricity is supplied to the driving circuit and the LED illuminating circuit by the power source circuit, the switch control circuit and the driving circuit are electrically connected with the LED illuminating circuit, and the stand-by power source circuit is electrically connected with the LED illuminating circuit; under normal conditions, the stand-by power source circuit is charged through the power source, electricity is supplied to the LED illuminating circuit by the stand-by power source circuit when the power source circuit is disconnected, and the LED circuit is suitable for the LED field.

Description

LED circuit with stand-by power supply circuit
Technical field
The utility model, with the LED circuit of stand-by power supply circuit, belongs to the technical field of LED circuit.
Background technology
LED because it has that brightness is high, operating voltage is low, power consumption is little, miniaturization, the life-span is long, shock-resistant and the advantage such as stable performance, in fields such as finance, traffic, physical culture, advertisements, be used widely, LED is operated under environment under low pressure and by electric current and drives, generally in LED circuit, the power supply of LED work obtains from power supply step-down, current existing LED circuit is comparatively complicated, its reduction voltage circuit generally adopts capacitance-resistance voltage reduction circuit, the operation principle of capacitance-resistance voltage reduction circuit is that the capacitive reactance that utilizes electric capacity to produce under certain AC signal frequency limits maximum operating currenbt, the output current of this class circuit is less, change along with input voltage, the brightness of LED also changes thereupon, and capacitance-resistance step down type power supply is a kind of non-insulating power supply, fail safe is lower, in addition, the high-frequency noise in LED operating circuit, the violent change of voltage all can affect its illumination effect, so need to take some means to provide stable operating current to LED illuminating circuit in LED circuit, and when the power supply of LED occurs extremely to open circuit, whole LED system is by cisco unity malfunction.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of simple in structure, can be the LED circuit with stand-by power supply circuit that LED provides stabling current and circuit still can normally be worked after the light source of LED opens circuit.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: comprise power circuit, drive circuit, ON-OFF control circuit and LED illuminating circuit, described power circuit comprises the energy storage chip that transformer that input is connected with mains supply, bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, the second output OUT2 is powered, passed through to described energy storage chip to drive circuitry by the first output OUT1 to LED illuminating circuit, the earth terminal GND ground connection of energy storage chip, described drive circuit comprises control chip and mainly by diode D1, capacitor C 3, the reduction voltage circuit that inductance L 2 forms, behind one end of the power end shunt-wound capacitance C2 of described control chip, be connected with the output OUT2 of energy storage chip, the other end ground connection of described capacitor C 2, the first control end of described control chip and connect the positive pole of diode D1 after be connected with one end of capacitor C 3, the negative pole of described diode D1 and connect one end of inductance L 2 after be connected with the first output OUT1 of energy storage chip, one end of capacitor C 1 is connected with the line between energy storage chip the first output OUT1 and diode D1 negative pole, the other end ground connection of described capacitor C 1, after the other end of the other end shunt-wound capacitance C3 of described inductance L 2, be connected with the power input of LED illuminating circuit, the power output end of described LED illuminating circuit is connected with the second control end of described control chip after being electrically connected to ON-OFF control circuit, the earth terminal GND ground connection of described control chip, described stand-by power supply circuit comprises rechargeable battery U1, resistance R 3, resistance R 4, resistance R 5, NPN type triode Q2, NPN type triode Q3 and diode D2, one end of the anodal and connecting resistance R4 of described rechargeable battery U1, behind one end of resistance R 5, be connected with the power input of LED illuminating circuit, behind one end of the negative pole of rechargeable battery U1 connecting resistance R3, be connected with the base stage of NPN type triode Q2, after the collector electrode of NPN type triode Q2 the other end of connecting resistance R4, be connected with the base stage of NPN type triode Q3, the collector electrode of NPN type triode Q3 connects the negative pole of diode D2, the other end of the anodal contact resistance R5 of diode D2, the emitter of NPN type triode Q3 also connects the emitter of NPN type triode Q2, after the other end of resistance R 3, be connected with the second control end of control chip.
Described ON-OFF control circuit comprises NPN type triode Q1 and resistance R 1, the collector electrode of described NPN type triode Q1 connects the power output end of LED illuminating circuit, one end of the base stage contact resistance R1 of NPN type triode Q1, the other end of resistance R 1 and connect the emitter of NPN type triode Q1 after be connected with the second control end of described control chip; Described control chip is CAT4201 chip; The power end of described control chip is VBT end, and the first control end of described control chip is SW end, and the second control end of described control chip is CTRL end, and described control chip also has reset terminal RSET, ground connection after described reset terminal RSET tandem electric inductance L1; Between described transformer and bridge rectifier, be serially connected with a resistance R 2; Described LED illuminating circuit comprises at least one LED branch road.
The utility model compared with prior art has following beneficial effect:
1, in the utility model, by transformer and bridge rectifier, mains supply can be converted to the required power supply of LED, by conversion after electrical power storage in energy storage chip, by energy storage chip, export to respectively LED illuminating circuit and drive circuit, drive circuit is controlled LED illuminating circuit by ON-OFF control circuit.
2, on the power circuit between energy storage chip and LED illuminating circuit, be provided with capacitor C 1, this capacitor C 1 not only can filtering energy storage chip output high-frequency noise, cut off the path that high-frequency noise is propagated by current supply circuit, and prevent that noise that power supply carries forms circuit and disturb, improve energy storage chip and export to the Current rise of LED illuminating circuit and the waveform of decline, waveform is become gently, reached the object that plateau current is provided to LED illuminating circuit; In like manner, on the power circuit between energy storage chip and control chip, be provided with capacitor C 2, make control chip have stable power supply input, reduced the impact that power supply increases sharply on chip.
3, in the utility model, reduction voltage circuit is connected with the SW port of CAT4201 chip, ON-OFF control circuit is connected with the CTRL port of CAT4201 chip, during work, reduction voltage circuit coordinates the output voltage of storage chip is carried out to reduced output voltage with CAT4201 chip, control the electric current of LED illuminating circuit, after the negative terminal connecting valve control circuit of LED illuminating circuit, be connected with the CTRL port of CAT4201 chip, electric current to LED illuminating circuit detects, and feed back switching signal amount, reach the output of controlling electric current.
When 4, power circuit is normally worked, not only give LED illuminating circuit and drive circuitry, return stand-by power supply circuit and charge, when the electric current of power circuit and rechargeable battery U1 is identical, NPN type triode Q2 cut-off, NPN type triode Q3 conducting, diode D2 lights, and illustrates that rechargeable battery U1 has been full of electricity, when power circuit disconnects because of abnormal conditions, stand-by power supply circuit is powered to LED illuminating circuit, thereby circuit is normally worked.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail:
Fig. 1 is structural representation of the present utility model;
In figure: 1 is power circuit, 2 is drive circuit, and 3 is ON-OFF control circuit, and 4 is LED illuminating circuit, and 5 is energy storage chip, and 6 is control chip, and 7 is reduction voltage circuit.
Embodiment
As shown in Figure 1, a kind of LED circuit, comprises power circuit 1, drive circuit 2, ON-OFF control circuit 3 and LED illuminating circuit 4, and described LED illuminating circuit 4 comprises at least one LED branch road, described power circuit 1 comprises the energy storage chip 5 that transformer that input is connected with mains supply, bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, is serially connected with a resistance R 2 and carries out dividing potential drop between described transformer and bridge rectifier, described energy storage chip 5 is powered, by the second output OUT2, to drive circuit 2, is powered to LED illuminating circuit 4 by the first output OUT1, the earth terminal GND ground connection of energy storage chip 5, described drive circuit 2 comprises control chip 6 and mainly by diode D1, capacitor C 3, the reduction voltage circuit 7 that inductance L 2 forms, behind one end of the power end shunt-wound capacitance C2 of described control chip 6, be connected with the output OUT2 of energy storage chip 5, the other end ground connection of described capacitor C 2, the first control end of described control chip 6 and connect the positive pole of diode D1 after be connected with one end of capacitor C 3, the negative pole of described diode D1 and connect one end of inductance L 2 after be connected with the first output OUT1 of energy storage chip 5, one end of capacitor C 1 is connected with the line between energy storage chip 5 first output OUT1 and diode D1 negative pole, the other end ground connection of described capacitor C 1, after the other end of the other end shunt-wound capacitance C3 of described inductance L 2, be connected with the power input of LED illuminating circuit 4, the power output end of described LED illuminating circuit 4 is connected with the second control end of described control chip 6 after being electrically connected to ON-OFF control circuit 3, the earth terminal GND ground connection of described control chip 6.
Described stand-by power supply circuit comprises rechargeable battery U1, resistance R 3, resistance R 4, resistance R 5, NPN type triode Q2, NPN type triode Q3 and diode D2, one end of the anodal and connecting resistance R4 of described rechargeable battery U1, behind one end of resistance R 5, be connected with the power input of LED illuminating circuit 4, behind one end of the negative pole of rechargeable battery U1 connecting resistance R3, be connected with the base stage of NPN type triode Q2, after the collector electrode of NPN type triode Q2 the other end of connecting resistance R4, be connected with the base stage of NPN type triode Q3, the collector electrode of NPN type triode Q3 connects the negative pole of diode D2, the other end of the anodal contact resistance R5 of diode D2, the emitter of NPN type triode Q3 also connects the emitter of NPN type triode Q2, after the other end of resistance R 3, be connected with the second control end of control chip 6.
Described ON-OFF control circuit 3 comprises NPN type triode Q1 and resistance R 1, the collector electrode of described NPN type triode Q1 connects the power output end of LED illuminating circuit 4, one end of the base stage contact resistance R1 of NPN type triode Q1, the other end of resistance R 1 and connect the emitter of NPN type triode Q1 after be connected with the second control end of described control chip 6.
In the present embodiment, described control chip 6 can be CAT4201 chip, the power end of described control chip 6 is VBT end, the first control end of described control chip 6 is SW end, the second control end of described control chip 6 is CTRL end, described control chip 6 also has reset terminal RSET, ground connection after described reset terminal RSET tandem electric inductance L1.
The utility model circuit structure is simple, the impact of the violent change that has effectively reduced high-frequency noise, voltage on LED operating circuit, and the LED illuminating circuit that is cascaded as by each circuit module provides stable operating current, has very large practicality; By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, makes various variations.

Claims (6)

1. with the LED circuit of stand-by power supply circuit, comprise power circuit (1), drive circuit (2), ON-OFF control circuit (3) and LED illuminating circuit (4), it is characterized in that: described power circuit (1) comprises the transformer that input is connected with mains supply, the energy storage chip (5) that the bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, described energy storage chip (5) is powered to LED illuminating circuit (4) by the first output OUT1, by the second output OUT2, to drive circuit (2), power, the earth terminal GND ground connection of energy storage chip (5), described drive circuit (2) comprises control chip (6) and mainly by diode D1, capacitor C 3, the reduction voltage circuit (7) that inductance L 2 forms, behind one end of the power end shunt-wound capacitance C2 of described control chip (6), be connected with the output OUT2 of energy storage chip (5), the other end ground connection of described capacitor C 2, the first control end of described control chip (6) and connect the positive pole of diode D1 after be connected with one end of capacitor C 3, the negative pole of described diode D1 and connect one end of inductance L 2 after be connected with the first output OUT1 of energy storage chip (5), one end of capacitor C 1 is connected with the line between energy storage chip (5) first output OUT1 and diode D1 negative pole, the other end ground connection of described capacitor C 1, after the other end of the other end shunt-wound capacitance C3 of described inductance L 2, be connected with the power input of LED illuminating circuit (4), the power output end of described LED illuminating circuit (4) is connected with the second control end of described control chip (6) after being electrically connected to ON-OFF control circuit (3), the earth terminal GND ground connection of described control chip (6),
Described stand-by power supply circuit comprises rechargeable battery U1, resistance R 3, resistance R 4, resistance R 5, NPN type triode Q2, NPN type triode Q3 and diode D2, one end of the anodal and connecting resistance R4 of described rechargeable battery U1, behind one end of resistance R 5, be connected with the power input of LED illuminating circuit (4), behind one end of the negative pole of rechargeable battery U1 connecting resistance R3, be connected with the base stage of NPN type triode Q2, after the collector electrode of NPN type triode Q2 the other end of connecting resistance R4, be connected with the base stage of NPN type triode Q3, the collector electrode of NPN type triode Q3 connects the negative pole of diode D2, the other end of the anodal contact resistance R5 of diode D2, the emitter of NPN type triode Q3 also connects the emitter of NPN type triode Q2, after the other end of resistance R 3, be connected with the second control end of control chip (6).
2. the LED circuit with stand-by power supply circuit according to claim 1, it is characterized in that: described ON-OFF control circuit (3) comprises NPN type triode Q1 and resistance R 1, the collector electrode of described NPN type triode Q1 connects the power output end of LED illuminating circuit (4), one end of the base stage contact resistance R1 of NPN type triode Q1, the other end of resistance R 1 and connect the emitter of NPN type triode Q1 after be connected with the second control end of described control chip (6).
3. the LED circuit with stand-by power supply circuit according to claim 1, is characterized in that: described control chip (6) is CAT4201 chip.
4. the LED circuit with stand-by power supply circuit according to claim 3, it is characterized in that: the power end of described control chip (6) is VBT end, the first control end of described control chip (6) is SW end, the second control end of described control chip (6) is CTRL end, described control chip (6) also has reset terminal RSET, ground connection after described reset terminal RSET tandem electric inductance L1.
5. the LED circuit with stand-by power supply circuit according to claim 1, is characterized in that: between described transformer and bridge rectifier, be serially connected with a resistance R 2.
6. the LED circuit with stand-by power supply circuit according to claim 1, is characterized in that: described LED illuminating circuit (4) comprises at least one LED branch road.
CN201420225538.8U 2014-05-05 2014-05-05 LED circuit having stand-by power source circuit Active CN203840610U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420225538.8U CN203840610U (en) 2014-05-05 2014-05-05 LED circuit having stand-by power source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420225538.8U CN203840610U (en) 2014-05-05 2014-05-05 LED circuit having stand-by power source circuit

Publications (1)

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CN203840610U true CN203840610U (en) 2014-09-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016078166A1 (en) * 2014-11-21 2016-05-26 张敏玲 Emergency lighting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016078166A1 (en) * 2014-11-21 2016-05-26 张敏玲 Emergency lighting circuit

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