CN104768298B - Input undervoltage protection type constant-current power supply - Google Patents
Input undervoltage protection type constant-current power supply Download PDFInfo
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- CN104768298B CN104768298B CN201510170366.8A CN201510170366A CN104768298B CN 104768298 B CN104768298 B CN 104768298B CN 201510170366 A CN201510170366 A CN 201510170366A CN 104768298 B CN104768298 B CN 104768298B
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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, is related to a kind of input undervoltage suitable for LED illumination lamp power supply
Protection type constant current source, belongs to electronic technology field.
Background technology
At present, traditional LED power circuit includes power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, drive
Dynamic control circuit 6, pressure-stabilizing constant flow circuit 7 and PFC correcting circuits 8.
In process of the present invention is realized, inventor has found at least there is problems with prior art：Existing LED power
Mostly wide power, input voltage range is AC85-265V.But in actual applications, electrical network condition of power supply is often very poor, has
When can drop to below 85V, and now power supply often can also work, but working condition is abnormal, can have a strong impact on circuit safety.
Too low input voltage increases can Switching Power Supply dutycycle, the increase of switching tube operating current, caloric value increase.Work can be made first
Making efficiency seriously reduces, and other working indexs are deteriorated.If long-time in a state in which, damage can power supply.At present, although
Under-voltage protecting circuit is occurred in that, but the sensitivity of these protection circuits is low, low-response, still results in power circuit and burns out.
The content of the invention
The technical problem to be solved in the present invention is not enough for more than, there is provided a kind of input undervoltage protection type constant current source,
After using the input undervoltage protection circuit, it is possible to achieve fast shut-off powers to protect the purpose of power supply, sensitivity during low-voltage
Height, fast response time.
To solve above technical problem, the present invention is employed the following technical solutions：A kind of input undervoltage protection type constant current source,
Including power circuit, output circuit, it is characterised in that：The constant current source is provided：
One input undervoltage protection circuit, is coupled between power circuit and outer network source, when outer net power input voltage it is low
When setting value, by Switching Power Supply power-off.
A kind of prioritization scheme, the input undervoltage protection circuit includes 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 voltage-stabilizing
Device U5, relay K1, audion Q7, diode D14；
The input termination power AC1 of the rectifier bridge DB1, power supply AC2, positive output termination capacitor C20 of rectifier bridge DB1
One end, 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 the resistance R34, one end of resistance R33, the input of three terminal regulator U5
End, the other end of electric capacity C21, the other end ground connection of resistance R33；
One end of output termination capacitor C22 of the three terminal regulator U5, the power end of OR-NOT circuit U4, diode
The negative pole of D14, one end of relay K1 coils, the other end ground connection of electric capacity C22.
Further, one end of another termination adjustable resistance BP of the resistance R36 and slide plate, adjustable resistance BP's is another
One end of terminating resistor R35, one end of electric capacity C23, an input of OR-NOT circuit U4, the other end of resistance R35, electric capacity
The other end ground connection of C23.
Further, another input end grounding of the OR-NOT circuit U4, the positive pole of diode D14, relay K1
The colelctor electrode of another termination audion Q7 of coil, the base stage of the output termination audion Q7 of OR-NOT circuit U4, audion Q7
Grounded emitter, the normally closed interlock of relay K1 is coupled between power circuit and outer network source.
Further, the power circuit includes 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, two
Pole pipe D1, diode D2, diode D3, the rectifier bridge of diode D4 compositions, switch transformer T have the first primary coil, the
Two primary coils and secondary coil, electric capacity C3 is connected between the positive pole of rectifier bridge and ground, and a termination rectifier bridge of resistance R1 is just
Pole, 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, diode D5's
Positive pole connects one end of the first primary coil, the other end ground connection of the first primary coil, one end of electric capacity C5, a termination of resistance R2
The positive pole of rectifier bridge, the other end of electric capacity C5, the negative pole of another terminating diode D6 of resistance R2, one end of the second primary coil
Connect the positive pole of rectifier bridge, the positive pole of another terminating diode D6 of the second primary coil, electric capacity C5, resistance R2 and diode D6 groups
Into surge absorbing circuit, secondary coil connects output circuit.
Further, the output circuit includes resistance R3, resistance R4, diode D7, diode D8, diode D9, electricity
Hold C6, electric capacity C7, electric capacity C8, electric capacity C9, positive pole, one end of resistance R3 of a terminating diode D7 of secondary coil, resistance R3
Another termination capacitor C6 one end, the negative pole of another terminating diode D7 of electric capacity C6, one end of electric capacity C7, the one of electric capacity C8
End, 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, negative pole, the pressure-stabilizing constant flow circuit of another terminating diode D8 of electric capacity C9, two poles
The positive pole of pipe D8 connects the other end of secondary coil, and the positive pole of diode D9 connects pressure-stabilizing constant flow circuit, and resistance R4 and diode D9 is simultaneously
Connection.
Further, the sample circuit is photoelectrical coupler U2.
Further, the pressure-stabilizing constant flow circuit includes operational amplifier U3, resistance R24, resistance R25, resistance R26, electricity
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 photoconductive resistance R-G, model AP4310 of operational amplifier U3, operational amplifier U3
1 foot connect the negative pole of diode D12, one end of resistance R26, the positive pole of diode D12 connects 2 feet of photoelectrical coupler U2, two poles
The positive pole of pipe D13, the negative pole of diode D13 connects 7 feet of operational amplifier U3, one end of resistance R30, the other end of resistance R30
Connect one end of electric capacity C19,6 feet, one end of resistance R31 of another termination operational amplifier U3 of electric capacity C19, resistance R31's is another
The positive pole of one terminating diode D9, one end of another termination capacitor C16 of resistance R26, another terminating resistor R24 of electric capacity C16
One end, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25, computing puts
One end, one end of resistance R28, one end of electric capacity C18 of the 3 foot connecting resistance R27 of big device U3, another termination capacitor of resistance R27
One end of C17,8 feet 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 foot of another termination photoelectrical coupler U2 of resistance R32,5 feet, the photosensitive electricity of another termination operational amplifier U3 of resistance R28
One end of resistance R-G, the other end Jing resistance R29 ground connection of photoconductive resistance R-G, the other end ground connection of electric capacity C18.
The present invention is adopted after above technical scheme, compared with prior art, with advantages below：When input voltage is normal,
OR-NOT circuit U4 inputs are low level, and OR-NOT circuit U4 output low levels, protection circuit is failure to actuate, and relay K1 is normally closed
Contact closure, Switching Power Supply normal work.When input voltage is less than 85V, electric resistance partial pressure value is reduced to low level, now or non-
Gate circuit U4 inputs are low level, export high level, and audion Q7 saturation conductions, the coil of relay K1 obtains electric, relay
The normally closed interlock of K1 disconnects, and Switching Power Supply power-off, switching power circuit is protected.
Product Jing of the present invention nearly 100 times under-voltage tests, fault-free occurs, hence it is demonstrated that with higher reliability and sensitive
Degree, improves the security reliability of constant current source, can extend the service life of power supply, and common traditional LED power circuit exists
During same under-voltage test, have 4 times and break down, from the point of view of fully proving that the superiority of product of the present invention, response time are contrasted,
Invention product improves about 50% than common traditional LED power product.
With reference to the accompanying drawings and examples the present invention is described in detail.
Description of the drawings
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 the circuit diagram of constant-current power supply circuit in the embodiment of the present invention；
Accompanying drawing 3 is the circuit diagram of pressure-stabilizing constant flow circuit in the embodiment of the present invention；
Accompanying drawing 4 is the circuit diagram of input undervoltage protection circuit in the embodiment of the present invention；
In figure,
1- power circuits, 2- output circuits, 3-LED illuminating lamps, 4- amplifying circuits, 5- sample circuits, 6- drive controls electricity
Road, 7- pressure-stabilizing constant flow circuits, 8-PFC correcting circuits, 9- input undervoltage protection circuits.
Specific embodiment
Embodiment, as shown in Figure 1, Figure 2, Figure 3 shows, a kind of input undervoltage protection type constant current source, power circuit includes coupling
Power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, drive control circuit 6, pressure-stabilizing constant flow circuit 7, PFC correction
Circuit 8 and input undervoltage protection circuit 9.
Power circuit 1 includes diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, electricity
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 of diode D4 compositions, switch transformer T has the first primary coil, the second primary coil and secondary
Level 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, and resistance R1's is another
One end of termination capacitor C4, the negative pole of diode D5, the other end ground connection of electric capacity C4, the positive pole of diode D5 connects the first primary line
One end of circle, the other end ground connection of the first primary coil, one end of electric capacity C5, the positive pole of a termination rectifier bridge of resistance R2, electricity
Hold the other end, the negative pole of another terminating diode D6 of resistance R2 of C5, the one of the second primary coil terminates the positive pole of rectifier bridge,
The positive pole of another terminating diode D6 of the second primary coil, electric capacity C5, resistance R2 and diode D6 composition surge absorbing circuits,
Secondary coil connects output circuit 2.
Output circuit 2 include resistance R3, resistance R4, diode D7, diode D8, diode D9, electric capacity C6, electric capacity C7,
Electric capacity C8, electric capacity C9, positive pole, one end of resistance R3 of a terminating diode D7 of secondary coil, another termination electricity of resistance R3
Hold one end of C6, negative pole, one end of electric capacity C7, one end of electric capacity C8, the pressure-stabilizing constant flow of another terminating diode D7 of electric capacity C6
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, electric capacity C9
One end, the negative pole of diode D9, negative pole, the pressure-stabilizing constant flow circuit 7 of another terminating diode D8 of electric capacity C9, diode D8 is just
Pole connects the other end of secondary coil, and the positive pole of diode D9 connects pressure-stabilizing constant flow circuit 7, and resistance R4 is in parallel with diode D9, resistance
R3, electric capacity C6 are 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 audion Q3, audion Q4 composition amplifying circuits
4, the input of amplifying circuit 4 connects sample circuit 5, the output termination drive control circuit 6 of amplifying circuit 4.
Sample circuit 5 includes photoelectrical coupler U2, output termination amplifying circuit 4, drive control circuit 6.Photoelectrical coupler
Positive pole, the negative pole of U2 connects respectively pressure-stabilizing constant flow circuit 7, and the magnitude of voltage of pressure-stabilizing constant flow circuit 7 is carried out into voltage sampling.
Drive control circuit 6 includes driving chip U1, resistance R7, resistance R12, electric capacity C10, diode D10, diode
D11, resistance R13, resistance R14, current-limiting resistance R15, field effect transistor Q1, model SA7527 of driving chip U1, driving chip
One end, one end of resistance R12, one end of electric capacity C10 of the 1 foot connecting resistance R7 of U1, the other end of resistance R12, electric capacity C10 it is another
2 feet, the outfan of amplifying circuit 4 of one termination driving chip U1, the input of another termination amplifying circuit 4 of resistance R7, two
The positive pole of pole pipe D10, the emitter stage of photoelectrical coupler U2, the negative pole of diode D10 connects the colelctor electrode of photoelectrical coupler U2, drives
8 feet of chip U1,3 feet of driving chip U1 connect PFC correcting circuits 8, and the 5 foot Jing resistance R6 of driving chip U1 connect power circuit 1
The positive pole of middle diode D5, the 6 feet ground of driving chip U1, one end of the 7 foot connecting resistance R13 of driving chip U1, diode D11
Negative pole, the other end of resistance R13, the positive pole of diode D11 connect the grid of field effect transistor Q1, the source electrode Jing current limlitings of field effect transistor Q1
Resistance R15 is grounded, and resistance R14 is connected between the grid of field effect transistor Q1 and the source electrode of field effect transistor Q1, field effect transistor Q1
Drain electrode connects the positive pole of diode D6 in power circuit 1, and 4 feet of driving chip U1 meet the source electrode of field effect transistor Q1, driving chip U1
8 foot Jing resistance R5 connect the negative pole of diode D5 in power circuit 1.
Pressure-stabilizing constant flow circuit 7 includes 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 photoconductive resistance R-G, model AP4310 of operational amplifier U3,1 foot of operational amplifier U3 is computing
The signal output part of amplifier 1,2 feet are the inversion signal input of operational amplifier 1, and 3 feet are the input of the in-phase signal of operational amplifier 1
End, 4 feet are earth terminal, and 5 feet are the in-phase signal input of operational amplifier 2, and 6 feet are the inversion signal input of operational amplifier 2,
7 feet are the signal output part of operational amplifier 2, and 8 feet are power end.1 foot of operational amplifier U3 connects the negative pole of diode D12, electricity
One end of resistance R26, the positive pole of diode D12 connects 2 feet of photoelectrical coupler U2, the positive pole of diode D13, and diode D13's is negative
Pole connects 7 feet of operational amplifier U3, one end of resistance R30, one end of another termination capacitor C19 of resistance R30, electric capacity C19's
6 feet, one end of resistance R31 of another termination operational amplifier U3, the positive pole of another terminating diode D9 of resistance R31, resistance
One end of another termination capacitor C16 of R26, one end, one end of resistance R25 of another terminating resistor R24 of electric capacity C16, resistance
The positive pole of another termination capacitor C8 of R24, the other end ground connection of resistance R25, the one of the 3 foot connecting resistance R27 of operational amplifier U3
End, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, the 8 of operational amplifier U3
Foot, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17, another termination photoelectric coupling of resistance R32
1 foot of device U2,5 feet, one end of photoconductive resistance R-G of another termination operational amplifier U3 of resistance R28, photoconductive resistance R-G's
Another termination Jing resistance R29 ground connection, the other end ground connection of electric capacity C18.
PFC correcting circuits 8 include resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance
R22, resistance R23, electric capacity C13, electric capacity C14, audion Q5 and audion Q6, one end of resistance R16, a termination of resistance R17
One end of resistance R2 in power circuit 1, one end, the collection of audion Q5 of the other end Jing resistance R18 connecting resistance R20 of resistance R16
Electrode, the other end ground connection of resistance R20, the base stage of audion Q5 is hanging, and the emitter stage Jing resistance R23 of audion Q5 connect audion
The base stage of Q6, one end of electric capacity C13, the other end ground connection of electric capacity C13, the grounded emitter of audion Q6, audion Q6 current collections
3 feet of one end of pole Jing resistance R22 connecting resistance R19, one end of resistance R21, one end of electric capacity C14 and driving chip U1, resistance
The other end ground connection of R21, the other end of another terminating resistor R17 of resistance R19, the other end ground connection of electric capacity C14.
As shown in figure 4, input undervoltage protection circuit 9 includes 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
Device K1, audion Q7, diode D14, the input termination power AC1 of rectifier bridge DB1, power supply AC2, the positive output of rectifier bridge DB1
One end of termination capacitor C20, one end of resistance R34, one end of resistance R36, electric capacity C20 the other end ground connection, resistance R34 it is another
One end of one termination capacitor C21, one end of resistance R33, the input of three terminal regulator U5, the other end of electric capacity C21, resistance
The other end ground connection of R33, one end of output termination capacitor C22 of three terminal regulator U5, the power end of OR-NOT circuit U4, two poles
The negative pole of pipe D14, one end of relay K1 coils, the other end ground connection of electric capacity C22, another termination adjustable resistance of resistance R36
One end of BP and slide plate, one end of another terminating resistor R35 of adjustable resistance BP, one end of electric capacity C23, OR-NOT circuit U4
One input, the other end of resistance R35, the other end ground connection of electric capacity C23, another input termination of OR-NOT circuit U4
Ground, the positive pole of diode D14, the colelctor electrode of another termination audion Q7 of relay K1 coils, the output of OR-NOT circuit U4
The base stage of termination audion Q7, the grounded emitter of audion Q7, the normally closed interlock of relay K1 be connected on power circuit 1 with it is outer
Between network source.
Model L7805 of three terminal regulator U5, model CD4001 of OR-NOT circuit U4.
The rectified bridge DB1 rectifications of input 220V, electric capacity C20 filtering, obtain a DC voltage.This voltage Jing resistance R33, electricity
Resistance R34 partial pressures, electric capacity C21 is filtered into three terminal regulator U5 and provides input voltage, and 5V voltages are stablized in three terminal regulator U5 outputs,
Power to OR-NOT circuit U4 and relay K1 circuits.One input termination low level of OR-NOT circuit U4, another input
Terminate on resistance R35, resistance R36, the bleeder circuit of adjustable resistance BP compositions, adjust adjustable resistance BP, make input voltage just
Chang Shi, OR-NOT circuit U4 input is low level, and OR-NOT circuit U4 output low levels, protection circuit is failure to actuate, relay
K1 normally closed interlocks are closed, Switching Power Supply normal work.
When input voltage is less than 85V, electric resistance partial pressure value is reduced to low level, and now OR-NOT circuit U4 inputs are low
Level, exports high level, and audion Q7 saturation conductions, the coil of relay K1 obtains electric, and the normally closed interlock of relay K1 disconnects, and opens
Close power cut-off.Protected switching power circuit.After input voltage recovers normal, circuit is automatically into working condition.
It is power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, drive control circuit 6, steady in above example
Pressure constant-current circuit 7, PFC correcting circuits 8 can be other custom circuits, as long as its function can be realized.
One skilled in the art would recognize that above-mentioned specific embodiment is exemplary, it is in order that ability
Field technique personnel can be better understood from present invention, should not be understood as limiting the scope of the invention, as long as
According to technical solution of the present invention improvements introduced, protection scope of the present invention is each fallen within.
Claims (1)
1. a kind of input undervoltage protection type constant current source, it is characterised in that：Including the power circuit of coupling（1）, output circuit
（2）, amplifying circuit（4）, sample circuit（5）, drive control circuit（6）, pressure-stabilizing constant flow circuit（7）, PFC correcting circuits（8）With
Input undervoltage protection circuit（9）；
Power circuit（1）Including 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,
The rectifier bridge of diode D3, diode D4 composition, switch transformer T has the first primary coil, the 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, the other end of resistance R1
One end, the negative pole of diode D5 of electric capacity C4 are connect, the other end ground connection of electric capacity C4, the positive pole of diode D5 connects the first primary coil
One end, the other end ground connection of the first primary coil, one end of electric capacity C5, the positive pole of a termination rectifier bridge of resistance R2, electric capacity
The negative pole of the other end of C5, another terminating diode D6 of resistance R2, the positive pole of a termination rectifier bridge of the second primary coil, the
The positive pole of another terminating diode D6 of two primary coils, electric capacity C5, resistance R2 and diode D6 composition surge absorbing circuits, it is secondary
Level coil connects output circuit（2）；
Output circuit（2）Including resistance R3, resistance R4, diode D7, diode D8, diode D9, electric capacity C6, electric capacity C7, electricity
Hold C8, electric capacity C9, positive pole, one end of resistance R3 of a terminating diode D7 of secondary coil, another termination capacitor of resistance R3
One end of C6, 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 electricity
Road（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, electric capacity C9
One end, the negative pole of diode D9, negative pole, the pressure-stabilizing constant flow circuit of another terminating diode D8 of electric capacity C9（7）, diode D8's
Positive pole connects the other end of secondary coil, and 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 are 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 audion Q3, audion Q4 composition amplifying circuits（4）,
Amplifying circuit（4）Input connect sample circuit（5）, amplifying circuit（4）Output termination drive control circuit（6）；
Sample circuit（5）Including photoelectrical coupler U2, output termination amplifying circuit（4）, drive control circuit（6）；Photoelectric coupling
Positive pole, the negative pole of device U2 connects respectively pressure-stabilizing constant flow circuit（7）, by pressure-stabilizing constant flow circuit（7）Magnitude of voltage carry out voltage sampling；
Drive control circuit（6）Including driving chip U1, resistance R7, resistance R12, electric capacity C10, diode D10, diode D11,
Resistance R13, resistance R14, current-limiting resistance R15, field effect transistor Q1, model SA7527 of driving chip U1, the 1 of driving chip U1
One end of foot connecting resistance R7, one end of resistance R12, one end of electric capacity C10, the other end of resistance R12, the other end of electric capacity C10
Connect 2 feet, the amplifying circuit of driving chip U1（4）Outfan, another termination amplifying circuit of resistance R7（4）Input, two
The positive pole of pole pipe D10, the emitter stage of photoelectrical coupler U2, the negative pole of diode D10 connects the colelctor electrode of photoelectrical coupler U2, drives
8 feet of chip U1,3 feet of driving chip U1 connect PFC correcting circuits（8）, the 5 foot Jing resistance R6 of driving chip U1 connect power circuit
（1）The positive pole of middle diode D5, the 6 feet ground of driving chip U1, one end, the diode of the 7 foot connecting resistance R13 of driving chip U1
The negative pole of D11, the other end of resistance R13, the positive pole of diode D11 connect the grid of field effect transistor Q1, the source electrode of field effect transistor Q1
Jing current-limiting resistances R15 is grounded, and resistance R14 is connected between the grid of field effect transistor Q1 and the source electrode of field effect transistor Q1, field effect
The drain electrode of pipe Q1 connects power circuit（1）The positive pole of middle diode D6,4 feet of driving chip U1 connect the source electrode of field effect transistor Q1, drive
The 8 foot Jing resistance R5 of dynamic chip U1 connect power circuit（1）The negative pole of middle diode D5；
Pressure-stabilizing constant flow circuit（7）Including 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, two
Pole pipe D13 and photoconductive resistance R-G, model AP4310 of operational amplifier U3,1 foot of operational amplifier U3 is operational amplifier
1 signal output part, 2 feet be the inversion signal input of operational amplifier 1,3 feet be the in-phase signal input of operational amplifier 1,4 feet
For earth terminal, 5 feet are the in-phase signal input of operational amplifier 2, and 6 feet are the inversion signal input of operational amplifier 2, and 7 feet are
The signal output part of operational amplifier 2,8 feet are power end；1 foot of operational amplifier U3 meets the negative pole of diode D12, resistance R26
One end, the positive pole of diode D12 connects 2 feet of photoelectrical coupler U2, the positive pole of diode D13, and the negative pole of diode D13 connects fortune
Calculate 7 feet, one end of resistance R30 of amplifier U3, one end of another termination capacitor C19 of resistance R30, the other end of electric capacity C19
Connect 6 feet, one end of resistance R31 of operational amplifier U3, the positive pole of another terminating diode D9 of resistance R31, resistance R26's is another
One end of one termination capacitor C16, one end, one end of resistance R25 of another terminating resistor R24 of electric capacity C16, resistance R24's is another
The positive pole of one termination capacitor C8, the other end ground connection of resistance R25, one end, the resistance of the 3 foot connecting resistance R27 of operational amplifier U3
One end of R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27,8 feet of operational amplifier U3, resistance
One end of R32, the negative pole of diode D8, the other end ground connection of electric capacity C17, the 1 of another termination photoelectrical coupler U2 of resistance R32
Foot, 5 feet, one end of photoconductive resistance R-G of another termination operational amplifier U3 of resistance R28, another termination of photoconductive resistance R-G
Jing resistance R29 is grounded, the other end ground connection of electric capacity C18；
PFC correcting circuits（8）Including resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance
R22, resistance R23, electric capacity C13, electric capacity C14, audion Q5 and audion Q6, one end of resistance R16, a termination of resistance R17
Power circuit（1）One end of middle resistance R2, one end of the other end Jing resistance R18 connecting resistance R20 of resistance R16, audion Q5
Colelctor electrode, the other end ground connection of resistance R20, the base stage of audion Q5 is hanging, and the emitter stage Jing resistance R23 of audion Q5 connect three poles
The base stage of pipe Q6, one end of electric capacity C13, the other end ground connection of electric capacity C13, the grounded emitter of audion Q6, audion Q6 collection
3 feet of one end of electrode Jing resistance R22 connecting resistance R19, one end of resistance R21, one end of electric capacity C14 and driving chip U1, electricity
The other end ground connection of resistance R21, the other end of another terminating resistor R17 of resistance R19, the other end ground connection of electric capacity C14；
Input undervoltage protection circuit（9）Including 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 K1, audion
Q7, diode D14, the input termination power AC1 of rectifier bridge DB1, power supply AC2, positive output termination capacitor C20 of rectifier bridge DB1
One end, one end of resistance R34, one end of resistance R36, electric capacity C20 the other end ground connection, another termination capacitor of resistance R34
One end of C21, one end of resistance R33, the input of three terminal regulator U5, the other end of electric capacity C21, the other end of resistance R33
Ground connection, one end of output termination capacitor C22 of three terminal regulator U5, the power end of OR-NOT circuit U4, diode D14 bear
Pole, one end of relay K1 coils, electric capacity C22 the other end ground connection, one end of another termination adjustable resistance BP of resistance R36 and
Slide plate, one end of another terminating resistor R35 of adjustable resistance BP, one end of electric capacity C23, an input of OR-NOT circuit U4
End, the other end of resistance R35, the other end ground connection of electric capacity C23, another input end grounding of OR-NOT circuit U4, diode
The colelctor electrode of the positive pole of D14, another termination audion Q7 of relay K1 coils, the output termination audion of OR-NOT circuit U4
The base stage of Q7, the grounded emitter of audion Q7, the normally closed interlock of relay K1 is connected on power circuit（1）With outer network source it
Between；
Model L7805 of three terminal regulator U5, model CD4001 of OR-NOT circuit U4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170366.8A CN104768298B (en) | 2015-04-04 | 2015-04-04 | Input undervoltage protection type constant-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170366.8A CN104768298B (en) | 2015-04-04 | 2015-04-04 | Input undervoltage protection type constant-current power supply |
Publications (2)
| Publication Number | Publication Date |
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| CN104768298A CN104768298A (en) | 2015-07-08 |
| CN104768298B true CN104768298B (en) | 2017-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510170366.8A Expired - Fee Related CN104768298B (en) | 2015-04-04 | 2015-04-04 | Input undervoltage protection type constant-current power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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 |
-
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 |
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| CN104768298A (en) | 2015-07-08 |
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