CN104768299B - Output short circuit protection type constant-current power supply - Google Patents
Output short circuit protection type constant-current power supply Download PDFInfo
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- CN104768299B CN104768299B CN201510170367.2A CN201510170367A CN104768299B CN 104768299 B CN104768299 B CN 104768299B CN 201510170367 A CN201510170367 A CN 201510170367A CN 104768299 B CN104768299 B CN 104768299B
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- 239000003990 capacitor Substances 0.000 claims description 17
- 230000005669 field effect Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 11
- 238000005286 illumination Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 5
- 238000011105 stabilization Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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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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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses an output short circuit protection type constant-current power supply which comprises an output circuit and a voltage-stabilization constant-current circuit. An output short circuit protection circuit is coupled between the output circuit and a load and used for detecting the voltage output by the output circuit. When a short circuit happens to the load, the short-circuit load is cut off. When the circuit works normally, the potential of the OUT+ end is high, and is added to the base electrode of a triode Q7 through voltage division of a resistor R34 and a resistor R35, and the triode Q7 is in saturation conduction. A coil of a relay K1 is powered on, and a normally open contact (3) and a normally open contact (4) are closed. Current is output normally. When a short circuit happens, the potential of the OUT+ end drops rapidly, the potential of the base electrode of the triode Q7 drops rapidly, the triode Q7 is cut off, the coil of the relay K1 is powered off, and the normally open contact (3) and the normally open contact (4) are switched off, the short circuit current is cut off, the aim of cutting off the output current in time is achieved, flexibility is high, and the response speed is high.
Description
Technical field
The present invention relates to a kind of power circuit, specifically, it is related to a kind of output short-circuit being applied to 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, drives
Dynamic control circuit 6, pressure-stabilizing constant flow circuit 7 and PFC correcting circuit 8.
In realizing process of the present invention, inventor finds at least there is problems with prior art：Though current circuit
So most chips have short-circuit protection function, but when output short-circuit, simply quit work, and differ and surely ring in time
Should, and output capacitor capacity is more, has compared with multi-charge, can produce very big short circuit current, burn out circuit.
Content of the invention
The technical problem to be solved in the present invention is for not enough above, provides a kind of output short circuit protection type constant current source,
After this output short circuit protection circuit, it is possible to achieve cut off the purpose of output current in time, sensitivity is high, fast response time.
For solving above technical problem, the present invention employs the following technical solutions：A kind of output short circuit protection type constant current source,
Including output circuit, pressure-stabilizing constant flow circuit it is characterised in that：Described constant current source provides：
One output short circuit protection circuit, is coupled between output circuit and load, for detecting the electricity of output circuit output
Pressure, when load is short-circuited, short circuit load is cut off.
A kind of prioritization scheme, described output short circuit protection circuit includes diode D9, inspection leakage resistance R4, resistance R33, resistance
R34, resistance R35, relay K1, audion Q7, diode D14, the negative pole of diode D9 connects output circuit, and diode D9 is just
Pole connects pressure-stabilizing constant flow circuit.
Further, described resistance R4 is in parallel with diode D9, a termination output circuit of resistance R33, and resistance R33's is another
The negative pole of one terminating diode D14, one end of relay K1 coil；
The colelctor electrode of another termination audion Q7 of described relay K1 coil, the positive pole of diode D14, audion Q7's
Grounded emitter；
One end of base stage connecting resistance R34 of described audion Q7, one end of resistance R35, the other end ground connection of resistance R35.
Further, another termination output circuit of described resistance R34, a terminating diode of relay K1 normally open contact
The positive pole of D9, another termination LED illumination lamp of relay K1 normally open contact.
Further, described output circuit includes resistance R3, diode D7, diode D8, electric capacity C6, electric capacity C7, electric capacity
C8, electric capacity C9, the positive pole of a terminating diode D7 of secondary coil, one end of resistance R3, another termination capacitor C6 of resistance R3
One end, 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, electricity
Hold the negative pole of another terminating diode D8, the pressure-stabilizing constant flow circuit of C9, the positive pole of diode D8 connects the other end of secondary coil.
Further, described 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 of another termination operational amplifier U3 of electric capacity C19, one end of resistance R31, resistance R31's is another
The positive pole of diode D9, one end of another termination capacitor C16 of resistance R26, electric capacity C16 in one termination output short circuit protection circuit
One end of another terminating resistor R24, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, resistance R25's
The other end is grounded, one end of 3 foot connecting resistance R27 of operational amplifier U3, one end of resistance R28, one end of electric capacity C18, resistance
One end of another termination capacitor C17 of R27,8 feet of operational amplifier U3, one end of resistance R32, the negative pole of diode D8, electricity
Hold the other end ground connection of C17,1 foot of another termination photoelectrical coupler U2 of resistance R32, another termination computing of resistance R28 is put
5 feet of big device U3, one end of photoconductive resistance R-G, the other end of photoconductive resistance R-G is grounded through resistance R29, and electric capacity C18's is another
End ground connection.
After the present invention adopts above technical scheme, compared with prior art, there is advantages below：During normal circuit operation,
OUT+ terminal potential is higher, is added to audion Q7 base stage through resistance R34, resistance R35 partial pressure, makes audion Q7 saturation conduction.Relay
Device K1 coil obtains electric, normally open contact 3,4 closure.Electric current normally exports.When a short circuit occurs, OUT+ terminal potential declines rapidly, and three
Pole pipe Q7 base potential declines rapidly, and audion Q7 ends, relay K1 coil blackout, and normally open contact 3,4 disconnects, short circuit current
It is disconnected, realize cutting off the purpose of output current in time, sensitivity is high, fast response time.
After tested, the constant current source of the present invention carries out test of many times success rate in the case of overheated and reaches 100%, can be in time
Cut-out power supply, does not cause power circuit to burn out；Common LED constant current power supply product under identical condition, is tested into
Power is only 75%, and has the phenomenon that power circuit burns out to occur；And the sensitivity of product of the present invention is very high, does not become
The test of work(it was demonstrated that response speed quickly.
The present invention is described in detail with reference to the accompanying drawings and examples.
Brief description
Accompanying drawing 1 is the circuit block diagram of constant current source in the embodiment of the present invention；
Accompanying drawing 2 is the circuit diagram of constant current source 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；
In figure,
1- power circuit, 2- output circuit, 3-LED illuminating lamp, 4- amplifying circuit, 5- sample circuit, 6- drive control electricity
Road, 7- pressure-stabilizing constant flow circuit, 8-PFC correcting circuit, 9- output short circuit protection circuit.
Specific embodiment
Embodiment, as shown in Figure 1, Figure 2, Figure 3 shows, a kind of output short circuit 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 output short circuit 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, the rectifier bridge of diode D3, diode D4 composition, 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 circuit,
Secondary coil connects output circuit 2.
Output circuit 2 includes resistance R3, diode D7, diode D8, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, secondary
The positive pole of one terminating diode D7 of level coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, electric capacity C6
The negative pole of another terminating diode D7, 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 other end of electric capacity C9
Connect negative pole, the pressure-stabilizing constant flow circuit 7 of diode D8, the positive pole of diode D8 meets the other end of secondary coil, resistance R3, electric capacity C6
It is used for abating the noise.
Resistance R8, resistance R9, resistance R10, resistance R11, electric capacity C11 and audion Q3, audion Q4 composition amplifying circuit
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
The positive pole of U2, negative pole 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 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 of 1 foot connecting resistance R7 of U1, one end of resistance R12, one end of electric capacity C10, the other end of resistance R12, electric capacity C10 another
One termination 2 feet of driving chip U1, the outfan of amplifying circuit 4, 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, driving
8 feet of chip U1,3 feet of driving chip U1 connect PFC correcting circuit 8, and 5 feet of driving chip U1 connect power circuit 1 through resistance R6
The positive pole of middle diode D5, the 6 feet ground of driving chip U1, one end of 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, and the source electrode of field effect transistor Q1 is through current limliting
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 feet connect the negative pole of diode D5 in power circuit 1 through resistance R5.
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
Amplifier 1 signal output part, 2 feet are operational amplifier 1 inversion signal input, and 3 feet are that operational amplifier 1 in-phase signal inputs
End, 4 feet are earth terminal, and 5 feet are operational amplifier 2 in-phase signal input, and 6 feet are operational amplifier 2 inversion signal input,
7 feet are operational amplifier 2 signal output part, 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 of another termination operational amplifier U3, one end of resistance R31, in another termination output short circuit protection circuit 9 of resistance R31
The positive pole of diode D9, one end of another termination capacitor C16 of resistance R26, one end of another terminating resistor 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, operational amplifier U3
One end of 3 foot connecting resistance R27, one end of resistance R28, one end of electric capacity C18, the one of another termination capacitor C17 of resistance R27
End, 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, resistance R32
Another termination photoelectrical coupler U2 1 foot, 5 feet of another termination operational amplifier U3 of resistance R28, photoconductive resistance R-G
One end, another termination of photoconductive resistance R-G is grounded through resistance R29, the other end ground connection of electric capacity C18.
PFC correcting circuit 8 includes 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 through resistance R18 connecting resistance R20 of the other end of resistance R16, the collection of audion Q5
Electrode, the other end ground connection of resistance R20, the base stage of audion Q5 is hanging, and the emitter stage of audion Q5 connects audion through resistance R23
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 collection
One end through resistance R22 connecting resistance R19 of pole, 3 feet of 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.
Output short circuit protection circuit 9 includes diode D9, inspection leakage resistance R4, resistance R33, resistance R34, resistance R35, relay
Device K1, audion Q7, diode D14, the negative pole of diode D9 connects one end of electric capacity C9 in output circuit 2, and diode D9 is just
Pole connects the other end of resistance R31 in pressure-stabilizing constant flow circuit 7, and resistance R4 is in parallel with diode D9, a termination output electricity of resistance R33
The other end of electric capacity C9 in road 2, the negative pole of another terminating diode D14 of resistance R33, one end of relay K1 coil, relay
The colelctor electrode of another termination audion Q7 of device K1 coil, the positive pole of diode D14, the grounded emitter of audion Q7, three poles
One end of base stage connecting resistance R34 of pipe Q7, one end of resistance R35, the other end ground connection of resistance R35, another termination of resistance R34
The positive pole of electric capacity C8 in output circuit 2, the positive pole of a terminating diode D9 of relay K1 normally open contact, relay K1 is normally opened to be touched
Another termination LED illumination lamp 3 of head.
When outfan is short-circuited suddenly, the short-circuit protection of circuit itself simply makes on-off circuit quit work, and exports
End filter capacitor still has more electric charge meeting abrupt release, forms larger short circuit current.Now inspection leakage resistance R4 is in loop
Unique load, resistance R4 can burn out by short circuit current first.In resistance R4 two ends parallel diode D9, make short circuit current in electricity
Pressure drop on resistance R4 is not above 0.7V.Thus protective resistance R4.
During normal circuit operation, OUT+ terminal potential is higher, is added to audion Q7 base stage through resistance R34, resistance R35 partial pressure,
Make audion Q7 saturation conduction.Relay K1 coil obtains electric, normally open contact 3,4 closure.Electric current normally exports.When being short-circuited
When, OUT+ terminal potential declines rapidly, and audion Q7 base potential declines rapidly, and audion Q7 ends, relay K1 coil blackout,
Normally open contact 3,4 disconnects, and short circuit current is disconnected.Thus playing short-circuit protection effect, sensitivity is high, fast response time.
In above example, power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, drive control circuit 6, steady
Pressure constant-current circuit 7, PFC correcting circuit 8 can be other custom circuits, as long as being capable of its function.
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, each fall within protection scope of the present invention.
Claims (1)
1. a kind of output short circuit protection type constant current source it is characterised in that：Including the power circuit coupling（1）, output circuit
（2）, amplifying circuit（4）, sample circuit（5）, drive control circuit（6）, pressure-stabilizing constant flow circuit（7）, PFC correcting circuit（8）With
Output short circuit 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
Connect one end, the negative pole of diode D5 of electric capacity C4, the other end ground connection of electric capacity C4, the positive pole of diode D5 connects the first primary coil
One end, the first primary coil the other end ground connection, one end of electric capacity C5, resistance R2 one termination rectifier bridge positive pole, electric capacity
The other end of 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
The positive pole of another terminating diode D6 of two primary coils, electric capacity C5, resistance R2 and diode D6 composition surge absorbing circuit, secondary
Level coil connects output circuit（2）；
Output circuit（2）Including resistance R3, diode D7, diode D8, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, secondary
The positive pole of one terminating diode D7 of coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, electric capacity C6's
The negative pole of another terminating diode D7, 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 other end of electric capacity C9
Connect negative pole, the pressure-stabilizing constant flow circuit of diode D8（7）, the positive pole of diode D8 connects the other end of secondary coil；
Resistance R8, resistance R9, resistance R10, resistance R11, electric capacity C11 and audion Q3, audion Q4 composition amplifying circuit（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
The positive pole of device U2, negative pole connect pressure-stabilizing constant flow circuit respectively（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, driving
8 feet of chip U1,3 feet of driving chip U1 connect PFC correcting circuit（8）, 5 feet of driving chip U1 connect power circuit through resistance R6
（1）The positive pole of middle diode D5, the 6 foot ground of driving chip U1, one end of 7 foot connecting resistance R13 of driving chip U1, diode
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
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, 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
8 feet of dynamic chip U1 connect power circuit through resistance R5（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 are operational amplifier 1 inversion signal input, and 3 feet are operational amplifier 1 in-phase signal input, 4 feet
For earth terminal, 5 feet are operational amplifier 2 in-phase signal input, and 6 feet are operational amplifier 2 inversion signal input, and 7 feet are
Operational amplifier 2 signal output part, 8 feet are power end, and 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, another termination output short circuit protection circuit of resistance R31（9）In two poles
The positive pole of pipe D9, one end of another termination capacitor C16 of resistance R26, one end of another terminating resistor R24 of electric capacity C16, resistance
One end of R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25,3 feet of operational amplifier U3
One end of connecting resistance R27, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, fortune
8 feet of calculation amplifier U3, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17, resistance R32's is another
1 foot of one termination photoelectrical coupler U2,5 feet of another termination operational amplifier U3 of resistance R28, one end of photoconductive resistance R-G,
Another termination of photoconductive resistance R-G is grounded through resistance R29, the other end ground connection of electric capacity C18；
PFC correcting circuit（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, the other end of resistance R16 one end through resistance R18 connecting resistance R20, audion Q5
Colelctor electrode, the other end ground connection of resistance R20, the base stage of audion Q5 is hanging, and the emitter stage of audion Q5 connects three poles through resistance R23
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
One end through resistance R22 connecting resistance R19 of electrode, 3 feet of 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；
Output short circuit protection circuit（9）, it is coupled between output circuit and load, for detecting the voltage of output circuit output,
When load is short-circuited, short circuit load is cut off, including diode D9, inspection leakage resistance R4, resistance R33, resistance R34, resistance
R35, relay K1, audion Q7, diode D14, the negative pole of diode D9 connects output circuit（2）One end of middle electric capacity C9, two
The positive pole of pole pipe D9 connects pressure-stabilizing constant flow circuit（7）The other end of middle resistance R31, resistance R4 is in parallel with diode D9, resistance R33's
One termination output circuit（2）The other end of middle electric capacity C9, the negative pole of another terminating diode D14 of resistance R33, relay K1 line
One end of circle, the colelctor electrode of another termination audion Q7 of relay K1 coil, the positive pole of diode D14, audion Q7 sends out
Emitter grounding, one end of base stage connecting resistance R34 of audion Q7, one end of resistance R35, the other end ground connection of resistance R35, resistance
Another termination output circuit of R34（2）The positive pole of middle electric capacity C8, a terminating diode D9 of relay K1 normally open contact is just
Pole, another termination LED illumination lamp of relay K1 normally open contact（3）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170367.2A CN104768299B (en) | 2015-04-04 | 2015-04-04 | Output short circuit protection type constant-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170367.2A CN104768299B (en) | 2015-04-04 | 2015-04-04 | Output short circuit protection type constant-current power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104768299A CN104768299A (en) | 2015-07-08 |
| CN104768299B true CN104768299B (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510170367.2A Active CN104768299B (en) | 2015-04-04 | 2015-04-04 | Output short circuit protection type constant-current power supply |
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| CN (1) | CN104768299B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2852598Y (en) * | 2005-11-24 | 2006-12-27 | 林益佳 | Electronic ballast |
| 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 |
-
2015
- 2015-04-04 CN CN201510170367.2A patent/CN104768299B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2852598Y (en) * | 2005-11-24 | 2006-12-27 | 林益佳 | Electronic ballast |
| 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 |
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| 《自动恢复短路保护》;像风一样离去10;《百度文库》;20121230;第2页 * |
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| Publication number | Publication date |
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| CN104768299A (en) | 2015-07-08 |
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Effective date of registration: 20171116 Address after: 4 No. 408400 Chongqing City Industrial Park, Nanchuan District DUCAM Avenue Patentee after: Chongqing Xin Nan Wan Yu machinery limited liability company Address before: 261061 Shandong city of Weifang province high tech Zone Baotong Street No. 7857 in Weifang Patentee before: Wei Renjie |
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