CN104768298A - Input undervoltage protection type constant-current power supply - Google Patents
Input undervoltage protection type constant-current power supply Download PDFInfo
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- CN104768298A CN104768298A CN201510170366.8A CN201510170366A CN104768298A CN 104768298 A CN104768298 A CN 104768298A CN 201510170366 A CN201510170366 A CN 201510170366A CN 104768298 A CN104768298 A CN 104768298A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an input undervoltage protection type constant-current power supply. An input undervoltage protection circuit is provided and coupled between a power circuit and an outer net power supply, and when the input voltage of the outer net power supply is lower than a set value, a switching power supply is powered off. When the input voltage is normal, the input end of an OR-NOT circuit U4 is in a low level, the low level is output by the OR-NOT circuit U4, a protection circuit does not act, a normally closed contact of a relay K1 is closed, and the switching power supply works normally. When the input voltage is lower than 85 V, the resistance voltage division value is reduced to the low level, at this moment, the low level is input to the OR-NOT circuit U4 inputs, a high level is output, a triode Q7 is in saturation conduction, a coil of the relay K1 is powered on, the normally closed contact of the relay K1 is disconnected, the switching power supply is powered off, a switching power supply circuit is protected, and the aim of fast cutting off power supplying to protect the power supply under low voltage is achieved.
Description
Technical field
The present invention relates to a kind of power circuit, specifically, relate to a kind of input undervoltage protection type constant-current supply being applicable to LED illumination lamp power supply, belong to electronic technology field.
Background technology
At present, traditional LED power circuit comprises power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6, pressure-stabilizing constant flow circuit 7 and PFC correcting circuit 8.
Realizing in process of the present invention, inventor finds at least there is following problem in prior art: existing LED power mostly is wide power, and input voltage range is AC85-265V.But in actual applications, mains supply condition is often very poor, drops to below 85V sometimes, and now power supply often can also work, but operating state is abnormal, can have a strong impact on circuit safety.Too low input voltage can make Switching Power Supply duty ratio increase, and switching tube operating current increases, and caloric value increases.First operating efficiency can be made seriously to reduce, and other working indexs are deteriorated.If be in this state for a long time, power supply can be made to damage.At present, although also there is under-voltage protecting circuit, the sensitivity of these protective circuits is low, low-response, and power circuit still can be caused to burn out.
Summary of the invention
The technical problem to be solved in the present invention is for above deficiency, provides a kind of input undervoltage protection type constant-current supply, and after adopting this input undervoltage protection circuit, when can realize low-voltage, fast shut-off is powered with the object of protection power source, highly sensitive, fast response time.
For solving above technical problem, the present invention by the following technical solutions: a kind of input undervoltage protection type constant-current supply, comprises power circuit, output circuit, it is characterized in that: described constant-current supply provides:
One input undervoltage protection circuit, is coupled between power circuit and outer network source, when outer net power input voltage is lower than set point, by Switching Power Supply power-off.
A kind of prioritization scheme, described input undervoltage protection circuit comprises rectifier bridge DB1, electric capacity C20, electric capacity C21, electric capacity C22, electric capacity C23, resistance R33, resistance R34, resistance R35, resistance R36, adjustable resistance BP, OR-NOT circuit U4, three terminal regulator U5, relay K 1, triode Q7, diode D14;
The input termination power AC1 of described rectifier bridge DB1, power supply AC2, one end of one end of the positive output termination capacitor C20 of rectifier bridge DB1, one end of resistance R34, resistance R36, the other end ground connection of electric capacity C20;
The input of one end of another termination capacitor C21 of described resistance R34, one end of resistance R33, three terminal regulator U5, the other end of electric capacity C21, the other end ground connection of resistance R33;
The negative pole of one end of the output termination capacitor C22 of described three terminal regulator U5, the power end of OR-NOT circuit U4, diode D14, one end of relay K 1 coil, the other end ground connection of electric capacity C22.
Further, one end of another termination adjustable resistance BP of described resistance R36 and slide plate, an input of one end of the other end connecting resistance R35 of adjustable resistance BP, one end of electric capacity C23, OR-NOT circuit U4, the other end of resistance R35, the other end ground connection of electric capacity C23.
Further, another input end grounding of described OR-NOT circuit U4, the collector electrode of the positive pole of diode D14, another termination triode Q7 of relay K 1 coil, the base stage of the output termination triode Q7 of OR-NOT circuit U4, the grounded emitter of triode Q7, the normally closed interlock of relay K 1 is coupled between power circuit and outer network source.
Further, described power circuit comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, resistance R1, resistance R2, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and switch transformer T, diode D1, diode D2, diode D3, the rectifier bridge that diode D4 forms, switch transformer T has the first primary coil, second primary coil and secondary coil, electric capacity C3 is connected between the positive pole of rectifier bridge and ground, the positive pole of a termination rectifier bridge of resistance R1, one end of another termination capacitor C4 of resistance R1, the negative pole of diode D5, the other end ground connection of electric capacity C4, the positive pole of diode D5 connects one end of the first primary coil, the other end ground connection of the first primary coil, one end of electric capacity C5, the positive pole of the one termination rectifier bridge of resistance R2, the other end of electric capacity C5, the negative pole of another terminating diode D6 of resistance R2, the positive pole of a termination rectifier bridge of the second primary coil, the positive pole of another terminating diode D6 of the second primary coil, electric capacity C5, resistance R2 and diode D6 forms surge absorbing circuit, and secondary coil connects output circuit.
Further, described output circuit comprises resistance R3, resistance R4, diode D7, diode D8, diode D9, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, the positive pole of one terminating diode D7 of secondary coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, the negative pole of another terminating diode D7 of electric capacity C6, one end of electric capacity C7, one end of electric capacity C8, pressure-stabilizing constant flow circuit and LED illumination lamp, the other end of electric capacity C7, the centre tap of another termination secondary coil of electric capacity C8, one end of electric capacity C9, the negative pole of diode D9, the negative pole of another terminating diode D8 of electric capacity C9, pressure-stabilizing constant flow circuit, the positive pole of diode D8 connects the other end of secondary coil, the positive pole of diode D9 connects pressure-stabilizing constant flow circuit, resistance R4 is in parallel with diode D9.
Further, described sample circuit is photoelectrical coupler U2
Further, described pressure-stabilizing constant flow circuit comprises operational amplifier U3, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, diode D12, the model of diode D13 and photo resistance R-G, operational amplifier U3 is AP4310, and 1 pin of operational amplifier U3 connects the negative pole of diode D12, one end of resistance R26, the positive pole of diode D12 connects 2 pin of photoelectrical coupler U2, the positive pole of diode D13, diode D13 negative pole connect 7 pin of operational amplifier U3, one end of resistance R30, one end of another termination capacitor C19 of resistance R30,6 pin of another termination operational amplifier U3 of electric capacity C19, one end of resistance R31, the positive pole of another terminating diode D9 of resistance R31, one end of another termination capacitor C16 of resistance R26, one end of the other end connecting resistance R24 of electric capacity C16, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25, one end of the 2 pin connecting resistance R27 of operational amplifier U3, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, 8 pin of operational amplifier U3, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17,1 pin of another termination photoelectrical coupler U2 of resistance R32,5 pin of another termination operational amplifier U3 of resistance R28, one end of photo resistance R-G, the other end of photo resistance R-G through resistance R29 ground connection, the other end ground connection of electric capacity C18.
After the present invention adopts above technical scheme, compared with prior art, have the following advantages: when input voltage is normal; OR-NOT circuit U4 input is low level, OR-NOT circuit U4 output low level, and protective circuit is failure to actuate; relay K 1 normally closed interlock closes, and Switching Power Supply normally works.When input voltage is lower than 85V, electric resistance partial pressure value is reduced to low level, and now OR-NOT circuit U4 input is low level; export high level, triode Q7 saturation conduction, the coil of relay K 1 obtains electric; the normally closed interlock of relay K 1 disconnects, and Switching Power Supply power-off, switching power circuit is protected.
Product of the present invention is through nearly 100 times under-voltage test, fault-free occurs, therefore prove that there is higher reliability and sensitivity, improve the security reliability of constant-current supply, can extend the useful life of power supply, common traditional LED power circuit is when same under-voltage test, have and break down for 4 times, the superiority of sufficient proof product of the present invention, the response time contrasts, and product of the present invention improves about 50% than common traditional LED power product.
Below in conjunction with drawings and Examples, the present invention is described in detail.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit block diagram of constant-current power supply circuit in the embodiment of the present invention;
Accompanying drawing 2 is circuit diagrams of constant-current power supply circuit in the embodiment of the present invention;
Accompanying drawing 3 is circuit diagrams of pressure-stabilizing constant flow circuit in the embodiment of the present invention;
Accompanying drawing 4 is circuit diagrams of input undervoltage protection circuit in the embodiment of the present invention;
In figure,
1-power circuit, 2-output circuit, 3-LED illuminating lamp, 4-amplifying circuit, 5-sample circuit, 6-Drive and Control Circuit, 7-pressure-stabilizing constant flow circuit, 8-PFC correcting circuit, 9-input undervoltage protection circuit.
Embodiment
Embodiment; as shown in Figure 1, Figure 2, Figure 3 shows; a kind of input undervoltage protection type constant-current supply, power circuit comprises the power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6, pressure-stabilizing constant flow circuit 7, PFC correcting circuit 8 and the input undervoltage protection circuit 9 that couple.
Power circuit 1 comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, resistance R1, resistance R2, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and switch transformer T, diode D1, diode D2, diode D3, the rectifier bridge that diode D4 forms, switch transformer T has the first primary coil, second primary coil and secondary coil, electric capacity C3 is connected between the positive pole of rectifier bridge and ground, the positive pole of a termination rectifier bridge of resistance R1, one end of another termination capacitor C4 of resistance R1, the negative pole of diode D5, the other end ground connection of electric capacity C4, the positive pole of diode D5 connects one end of the first primary coil, the other end ground connection of the first primary coil, one end of electric capacity C5, the positive pole of the one termination rectifier bridge of resistance R2, the other end of electric capacity C5, the negative pole of another terminating diode D6 of resistance R2, the positive pole of a termination rectifier bridge of the second primary coil, the positive pole of another terminating diode D6 of the second primary coil, electric capacity C5, resistance R2 and diode D6 forms surge absorbing circuit, and secondary coil connects output circuit 2.
Output circuit 2 comprises resistance R3, resistance R4, diode D7, diode D8, diode D9, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, the positive pole of one terminating diode D7 of secondary coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, the negative pole of another terminating diode D7 of electric capacity C6, one end of electric capacity C7, one end of electric capacity C8, pressure-stabilizing constant flow circuit 7 and LED illumination lamp 3, the other end of electric capacity C7, the centre tap of another termination secondary coil of electric capacity C8, one end of electric capacity C9, the negative pole of diode D9, the negative pole of another terminating diode D8 of electric capacity C9, pressure-stabilizing constant flow circuit 7, the positive pole of diode D8 connects the other end of secondary coil, the positive pole of diode D9 connects pressure-stabilizing constant flow circuit 7, resistance R4 is in parallel with diode D9, resistance R3, electric capacity C6 is used for abating the noise.LED illumination lamp 3 is connected between out+ and out-.
Resistance R8, resistance R9, resistance R10, resistance R11, electric capacity C11 and triode Q3, triode Q4 form amplifying circuit 4, and the input of amplifying circuit 4 connects sample circuit 5, the output termination Drive and Control Circuit 6 of amplifying circuit 4.
Sample circuit 5 comprises photoelectrical coupler U2, exports termination amplifying circuit 4, Drive and Control Circuit 6.Positive pole, the negative pole of photoelectrical coupler U2 connect pressure-stabilizing constant flow circuit 7 respectively, and the magnitude of voltage of pressure-stabilizing constant flow circuit 7 is carried out voltage sampling.
Drive and Control Circuit 6 comprises driving chip U1, resistance R7, resistance R12, electric capacity C10, diode D10, diode D11, resistance R13, resistance R14, current-limiting resistance R15, the model of field effect transistor Q1, driving chip U1 is SA7527, one end of the 1 pin connecting resistance R7 of driving chip U1, one end of resistance R12, one end of electric capacity C10, the other end of resistance R12, 2 pin of another termination driving chip U1 of electric capacity C10, the output of amplifying circuit 4, the input of another termination amplifying circuit 4 of resistance R7, the positive pole of diode D10, the emitter of photoelectrical coupler U2, the negative pole of diode D10 connects the collector electrode of photoelectrical coupler U2, 8 pin of driving chip U1,3 pin of driving chip U1 connect PFC correcting circuit 8, and 5 pin of driving chip U1 connect the positive pole of diode D5 in power circuit 1 through resistance R6, the 6 pin ground of driving chip U1, one end of the 7 pin connecting resistance R13 of driving chip U1, the negative pole of diode D11, the other end of resistance R13, the positive pole of diode D11 connects the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is through current-limiting resistance R15 ground connection, resistance R14 is connected between the grid of field effect transistor Q1 and the source electrode of field effect transistor Q1, the drain electrode of field effect transistor Q1 connects the positive pole of diode D6 in power circuit 1,4 pin of driving chip U1 connect the source electrode of field effect transistor Q1, and 8 pin of driving chip U1 connect the negative pole of diode D5 in power circuit 1 through resistance R5.
Pressure-stabilizing constant flow circuit 7 comprises operational amplifier U3, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, diode D12, diode D13 and photo resistance R-G, the model of operational amplifier U3 is AP4310, 1 pin of operational amplifier U3 is operational amplifier 1 signal output part, 2 pin are operational amplifier 1 inversion signal input, 3 pin are operational amplifier 1 in-phase signal input, 4 pin are earth terminal, 5 pin are operational amplifier 2 in-phase signal input, 6 pin are operational amplifier 2 inversion signal input, 7 pin are operational amplifier 2 signal output part, 8 pin are power end.1 pin of operational amplifier U3 connects the negative pole of diode D12, one end of resistance R26, the positive pole of diode D12 connects 2 pin of photoelectrical coupler U2, the positive pole of diode D13, diode D13 negative pole connect 7 pin of operational amplifier U3, one end of resistance R30, one end of another termination capacitor C19 of resistance R30, 6 pin of another termination operational amplifier U3 of electric capacity C19, one end of resistance R31, the positive pole of another terminating diode D9 of resistance R31, one end of another termination capacitor C16 of resistance R26, one end of the other end connecting resistance R24 of electric capacity C16, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25, one end of the 2 pin connecting resistance R27 of operational amplifier U3, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, 8 pin of operational amplifier U3, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17, 1 pin of another termination photoelectrical coupler U2 of resistance R32, 5 pin of another termination operational amplifier U3 of resistance R28, one end of photo resistance R-G, another termination of photo resistance R-G is through resistance R29 ground connection, the other end ground connection of electric capacity C18.
PFC correcting circuit 8 comprises resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, resistance R23, electric capacity C13, electric capacity C14, triode Q5 and triode Q6, one end of resistance R16, one end of resistance R2 in the one termination power circuit 1 of resistance R17, the other end of resistance R16 is through one end of resistance R18 connecting resistance R20, the collector electrode of triode Q5, the other end ground connection of resistance R20, the base stage of triode Q5 is unsettled, the emitter of triode Q5 connects the base stage of triode Q6 through resistance R23, one end of electric capacity C13, the other end ground connection of electric capacity C13, the grounded emitter of triode Q6, triode Q6 collector electrode is through one end of resistance R22 connecting resistance R19, one end of resistance R21, one end of electric capacity C14 and 3 pin of driving chip U1, the other end ground connection of resistance R21, the other end of the other end connecting resistance R17 of resistance R19, the other end ground connection of electric capacity C14.
As shown in Figure 4, input undervoltage protection circuit 9 comprises rectifier bridge DB1, electric capacity C20, electric capacity C21, electric capacity C22, electric capacity C23, resistance R33, resistance R34, resistance R35, resistance R36, adjustable resistance BP, OR-NOT circuit U4, three terminal regulator U5, relay K 1, triode Q7, the input termination power AC1 of diode D14, rectifier bridge DB1, one end of the positive output termination capacitor C20 of power supply AC2, rectifier bridge DB1, one end of resistance R34, one end of resistance R36, the other end ground connection of electric capacity C20, one end of another termination capacitor C21 of resistance R34, one end of resistance R33, the input of three terminal regulator U5, the other end of electric capacity C21, the other end ground connection of resistance R33, one end of the output termination capacitor C22 of three terminal regulator U5, the power end of OR-NOT circuit U4, the negative pole of diode D14, one end of relay K 1 coil, the other end ground connection of electric capacity C22, one end of another termination adjustable resistance BP of resistance R36 and slide plate, one end of the other end connecting resistance R35 of adjustable resistance BP, one end of electric capacity C23, an input of OR-NOT circuit U4, the other end of resistance R35, the other end ground connection of electric capacity C23, another input end grounding of OR-NOT circuit U4, the positive pole of diode D14, the collector electrode of another termination triode Q7 of relay K 1 coil, the base stage of the output termination triode Q7 of OR-NOT circuit U4, the grounded emitter of triode Q7, the normally closed interlock of relay K 1 is connected between power circuit 1 and outer network source.
The model of three terminal regulator U5 is the model of L7805, OR-NOT circuit U4 is CD4001.
220V is through rectifier bridge DB1 rectification in input, and electric capacity C20 filtering, obtains a direct voltage.This voltage is through resistance R33, resistance R34 dividing potential drop, and electric capacity C21 is filtered into three terminal regulator U5 and provides input voltage, and three terminal regulator U5 stable output 5V voltage, to OR-NOT circuit U4 and relay K 1 circuit supply.An input termination low level of OR-NOT circuit U4; on the bleeder circuit that another input is connected on resistance R35, resistance R36, adjustable resistance BP forms; regulate adjustable resistance BP; when making input voltage normal; OR-NOT circuit U4 input is low level, OR-NOT circuit U4 output low level, and protective circuit is failure to actuate; relay K 1 normally closed interlock closes, and Switching Power Supply normally works.
When input voltage is lower than 85V, electric resistance partial pressure value is reduced to low level, and now OR-NOT circuit U4 input is low level, and export high level, triode Q7 saturation conduction, the coil of relay K 1 obtains electric, and the normally closed interlock of relay K 1 disconnects, Switching Power Supply power-off.Make switching power circuit protected.Input voltage recovers normally, and circuit enters operating state automatically.
In above embodiment, power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6, pressure-stabilizing constant flow circuit 7, PFC correcting circuit 8 can be other custom circuit, as long as can realize its function.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; to enable those skilled in the art better understand content of the present invention; should not be understood as limiting the scope of the invention; as long as according to the improvement that technical solution of the present invention is done, all fall into protection scope of the present invention.
Claims (8)
1. an input undervoltage protection type constant-current supply, is characterized in that: comprise power circuit (1), output circuit (2), described constant-current supply provides:
Input undervoltage protection circuit (9), is coupled between power circuit (1) and outer network source, when outer net power input voltage is lower than set point, by Switching Power Supply power-off.
2. constant-current supply as claimed in claim 1, is characterized in that: described input undervoltage protection circuit (9) comprises rectifier bridge DB1, electric capacity C20, electric capacity C21, electric capacity C22, electric capacity C23, resistance R33, resistance R34, resistance R35, resistance R36, adjustable resistance BP, OR-NOT circuit U4, three terminal regulator U5, relay K 1, triode Q7, diode D14;
The input termination power AC1 of described rectifier bridge DB1, power supply AC2, one end of one end of the positive output termination capacitor C20 of rectifier bridge DB1, one end of resistance R34, resistance R36, the other end ground connection of electric capacity C20;
The input of one end of another termination capacitor C21 of described resistance R34, one end of resistance R33, three terminal regulator U5, the other end of electric capacity C21, the other end ground connection of resistance R33;
The negative pole of one end of the output termination capacitor C22 of described three terminal regulator U5, the power end of OR-NOT circuit U4, diode D14, one end of relay K 1 coil, the other end ground connection of electric capacity C22.
3. constant-current supply as claimed in claim 2, it is characterized in that: one end of another termination adjustable resistance BP of described resistance R36 and slide plate, an input of one end of the other end connecting resistance R35 of adjustable resistance BP, one end of electric capacity C23, OR-NOT circuit U4, the other end of resistance R35, the other end ground connection of electric capacity C23.
4. constant-current supply as claimed in claim 3, it is characterized in that: another input end grounding of described OR-NOT circuit U4, the collector electrode of the positive pole of diode D14, another termination triode Q7 of relay K 1 coil, the base stage of the output termination triode Q7 of OR-NOT circuit U4, the grounded emitter of triode Q7, the normally closed interlock of relay K 1 is coupled between power circuit (1) and outer network source.
5. constant-current supply as claimed in claim 4, is characterized in that: described power circuit (1) comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, resistance R1, resistance R2, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and switch transformer T, diode D1, diode D2, diode D3, the rectifier bridge that diode D4 forms, switch transformer T has the first primary coil, second primary coil and secondary coil, electric capacity C3 is connected between the positive pole of rectifier bridge and ground, the positive pole of a termination rectifier bridge of resistance R1, one end of another termination capacitor C4 of resistance R1, the negative pole of diode D5, the other end ground connection of electric capacity C4, the positive pole of diode D5 connects one end of the first primary coil, the other end ground connection of the first primary coil, one end of electric capacity C5, the positive pole of the one termination rectifier bridge of resistance R2, the other end of electric capacity C5, the negative pole of another terminating diode D6 of resistance R2, the positive pole of a termination rectifier bridge of the second primary coil, the positive pole of another terminating diode D6 of the second primary coil, electric capacity C5, resistance R2 and diode D6 forms surge absorbing circuit, and secondary coil connects output circuit (2).
6. constant-current supply as claimed in claim 5, it is characterized in that: described output circuit (2) comprises resistance R3, resistance R4, diode D7, diode D8, diode D9, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, the positive pole of one terminating diode D7 of secondary coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, the negative pole of another terminating diode D7 of electric capacity C6, one end of electric capacity C7, one end of electric capacity C8, pressure-stabilizing constant flow circuit (7) and LED illumination lamp (3), the other end of electric capacity C7, the centre tap of another termination secondary coil of electric capacity C8, one end of electric capacity C9, the negative pole of diode D9, the negative pole of another terminating diode D8 of electric capacity C9, pressure-stabilizing constant flow circuit (7), the positive pole of diode D8 connects the other end of secondary coil, the positive pole of diode D9 connects pressure-stabilizing constant flow circuit (7), resistance R4 is in parallel with diode D9.
7. constant-current supply as claimed in claim 6, is characterized in that: described sample circuit (5) is photoelectrical coupler U2.
8. constant-current supply as claimed in claim 7, is characterized in that: described pressure-stabilizing constant flow circuit (7) comprises operational amplifier U3, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, diode D12, the model of diode D13 and photo resistance R-G, operational amplifier U3 is AP4310, and 1 pin of operational amplifier U3 connects the negative pole of diode D12, one end of resistance R26, the positive pole of diode D12 connects 2 pin of photoelectrical coupler U2, the positive pole of diode D13, diode D13 negative pole connect 7 pin of operational amplifier U3, one end of resistance R30, one end of another termination capacitor C19 of resistance R30,6 pin of another termination operational amplifier U3 of electric capacity C19, one end of resistance R31, the positive pole of another terminating diode D9 of resistance R31, one end of another termination capacitor C16 of resistance R26, one end of the other end connecting resistance R24 of electric capacity C16, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25, one end of the 2 pin connecting resistance R27 of operational amplifier U3, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, 8 pin of operational amplifier U3, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17,1 pin of another termination photoelectrical coupler U2 of resistance R32,5 pin of another termination operational amplifier U3 of resistance R28, one end of photo resistance R-G, the other end of photo resistance R-G through resistance R29 ground connection, the other end ground connection of electric capacity C18.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510170366.8A CN104768298B (en) | 2015-04-04 | 2015-04-04 | Input undervoltage protection type constant-current power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510170366.8A CN104768298B (en) | 2015-04-04 | 2015-04-04 | Input undervoltage protection type constant-current power supply |
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| CN104768298A true CN104768298A (en) | 2015-07-08 |
| CN104768298B CN104768298B (en) | 2017-05-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107484316A (en) * | 2016-06-07 | 2017-12-15 | 重庆恒又源科技发展有限公司 | Illuminate exception handling device and method |
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| CN202652620U (en) * | 2012-05-23 | 2013-01-02 | 山东彩霆生态照明器材科技有限公司 | Voltage stabilizing constant current circuit for LED drive power supply |
| CN103840428A (en) * | 2012-11-26 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Undervoltage protection circuit and lamp |
| CN204164921U (en) * | 2014-06-06 | 2015-02-18 | 浙江工商职业技术学院 | A kind of self-timing electricity-saving lamp based on solar energy |
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2015
- 2015-04-04 CN CN201510170366.8A patent/CN104768298B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200983697Y (en) * | 2006-11-15 | 2007-11-28 | 王俊杰 | Intelligent cutting light voltage stabilizing power saving case |
| EP1937038A2 (en) * | 2006-12-19 | 2008-06-25 | Advanced Dimming Technology Limited | Power regulator |
| CN202652620U (en) * | 2012-05-23 | 2013-01-02 | 山东彩霆生态照明器材科技有限公司 | Voltage stabilizing constant current circuit for LED drive power supply |
| CN103840428A (en) * | 2012-11-26 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Undervoltage protection circuit and lamp |
| CN204164921U (en) * | 2014-06-06 | 2015-02-18 | 浙江工商职业技术学院 | A kind of self-timing electricity-saving lamp based on solar energy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107484316A (en) * | 2016-06-07 | 2017-12-15 | 重庆恒又源科技发展有限公司 | Illuminate exception handling device and method |
| CN107484316B (en) * | 2016-06-07 | 2019-06-11 | 恒亦明（重庆）科技有限公司 | Illuminate exception handling device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104768298B (en) | 2017-05-03 |
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