CN104167708B - Over-current protection circuit and lamp - Google Patents

Over-current protection circuit and lamp Download PDF

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Publication number
CN104167708B
CN104167708B CN201310180934.3A CN201310180934A CN104167708B CN 104167708 B CN104167708 B CN 104167708B CN 201310180934 A CN201310180934 A CN 201310180934A CN 104167708 B CN104167708 B CN 104167708B
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China
Prior art keywords
divider resistance
circuit
pin
connect respectively
negative electrode
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CN201310180934.3A
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CN104167708A (en
Inventor
周明杰
徐亮亮
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Oceans King Lighting Science and Technology Co Ltd
Oceans King Dongguan Lighting Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
Original Assignee
Oceans King Lighting Science and Technology Co Ltd
Oceans King Dongguan Lighting Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Application filed by Oceans King Lighting Science and Technology Co Ltd, Oceans King Dongguan Lighting Technology Co Ltd, Shenzhen Oceans King Lighting Engineering Co Ltd filed Critical Oceans King Lighting Science and Technology Co Ltd
Priority to CN201310180934.3A priority Critical patent/CN104167708B/en
Publication of CN104167708A publication Critical patent/CN104167708A/en
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Abstract

The invention, which is suitable for illumination circuit field, especially relates to an over-current protection circuit and a lamp. A divider resistor R10 is used for collecting a current of a load circuit. If the voltage after series connection of a divider resistor R9 and the divider resistor R10 is lower than a reference voltage, a power supply circuit provides power for the over-current protection circuit and the load circuit continuously; and if the voltage after series connection of the divider resistor R9 and the divider resistor R10 is higher than the reference voltage, a relay K1 cuts off power supplying of the power supply circuit for the over-current protection circuit and the load circuit. Therefore, the over-current protection circuit and the load circuit are effectively protected and thus the potential safety hazard is effectively prevented.

Description

A kind of current foldback circuit and light fixture
Technical field
The invention belongs to illumination circuit field, more particularly to a kind of current foldback circuit and light fixture.
Background technology
As the continuous development of science and technology, New Products & New Technology are constantly reformed, various light fixtures have been deep into day Often in live and work.
Although light fixture makes life more colourful.But it is to provide excessive to the electric current of light fixture, can burns including light fixture Load circuit, when serious, can fire hazard, cause security incident etc..
The content of the invention
It is an object of the invention to provide a kind of current foldback circuit, it is desirable to provide a kind of current foldback circuit, detection bag The electric current of the load circuit of light fixture is included, when overcurrent, the electric current provided to load circuit is turned off in time.
The present invention is achieved in that a kind of current foldback circuit, the input and output end of the current foldback circuit Power circuit and load circuit are connect respectively, and the current foldback circuit includes:
Protection circuit, mu balanced circuit, relay K1, PNP type triode Q2, diode D2, divider resistance R7, shunt resistance R8, amplifier chip U2, divider resistance R9 and divider resistance R10;
The protection circuit connects respectively the power circuit and the mu balanced circuit, first controlled end of the relay K1 Controlled with second to terminate the protection circuit, first control signal and the second control signal of the relay K1 connect respectively The emitter stage of the mu balanced circuit and PNP type triode Q2, the anode and negative electrode of the diode D2 connect respectively it is described after Second control signal and the first control signal of electrical equipment K1, the divider resistance R7 is connected to PNP type triode Q2 Emitter stage and base stage between, the shunt resistance R8 is connected to the base stage of PNP type triode Q2 and amplifier chip U2 Output pin between, the grounded collector of PNP type triode Q2, the power pins of the amplifier chip U2, draw Pin, high voltage input pin, low-voltage input pin connect respectively the mu balanced circuit, the first end of the divider resistance R9, The mu balanced circuit, the divider resistance R10 is connected between second end of the divider resistance R9 and ground, the diode D2 Negative electrode and second end of the divider resistance R9 connect the load circuit.
The present invention also provides a kind of light fixture, and the light fixture includes power circuit and load circuit, and the light fixture also included Stream protection circuit, the current foldback circuit also includes:
Protection circuit, mu balanced circuit, relay K1, PNP type triode Q2, diode D2, divider resistance R7, shunt resistance R8, amplifier chip U2, divider resistance R9 and divider resistance R10;
The protection circuit connects respectively the power circuit and the mu balanced circuit, first controlled end of the relay K1 Controlled with second to terminate the protection circuit, first control signal and the second control signal of the relay K1 connect respectively The emitter stage of the mu balanced circuit and PNP type triode Q2, the anode and negative electrode of the diode D2 connect respectively it is described after Second control signal and the first control signal of electrical equipment K1, the divider resistance R7 is connected to PNP type triode Q2 Emitter stage and base stage between, the shunt resistance R8 is connected to the base stage of PNP type triode Q2 and amplifier chip U2 Output pin between, the grounded collector of PNP type triode Q2, the power pins of the amplifier chip U2, draw Pin, high voltage input pin, low-voltage input pin connect respectively the mu balanced circuit, the first end of the divider resistance R9, The mu balanced circuit, the divider resistance R10 is connected between second end of the divider resistance R9 and ground, the diode D2 Negative electrode and second end of the divider resistance R9 connect the load circuit.
In the present invention, the electric current of load circuit is gathered by divider resistance R10, if divider resistance R9 and divider resistance Voltage after R10 series connection is less than reference voltage, then power circuit continues to be powered to current foldback circuit and load circuit;If partial pressure Voltage after resistance R9 and divider resistance R10 series connection is more than reference voltage, then relay K1 interrupting power circuits are to overcurrent protection The power supply of circuit and load circuit;So as to, current foldback circuit and load circuit are effectively protected, effectively prevent safety Hidden danger.
Description of the drawings
Fig. 1 is the circuit structure diagram of current foldback circuit provided in an embodiment of the present invention;
Fig. 2 is the circuit diagram of current foldback circuit provided in an embodiment of the present invention;
Fig. 3 is the circuit diagram of another current foldback circuit provided in an embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and It is not used in the restriction present invention.
Fig. 1 shows the structure of current foldback circuit provided in an embodiment of the present invention, for convenience of description, illustrate only with The related part of the embodiment of the present invention, details are as follows.
A kind of current foldback circuit, the input and output end of the current foldback circuit connect respectively power circuit and load Circuit, the current foldback circuit includes:
Protection circuit 3, mu balanced circuit 2, relay K1, PNP type triode Q2, diode D2, divider resistance R7, shunting electricity Resistance R8, amplifier chip U2, divider resistance R9 and divider resistance R10;
The protection circuit 3 connects respectively the power circuit and the mu balanced circuit 2, and the first of the relay K1 is controlled End termination controlled with second protection circuit 3, first control signal and the second control signal point of the relay K1 The emitter stage of the mu balanced circuit 2 and PNP type triode Q2 is not connect, the anode and negative electrode of the diode D2 meet respectively institute Second control signal and the first control signal of relay K1 are stated, the divider resistance R7 is connected to the pole of the positive-negative-positive three Between the emitter stage and base stage of pipe Q2, the shunt resistance R8 is connected to the base stage and amplifier core of PNP type triode Q2 Between the output pin VO of piece U2, the grounded collector of PNP type triode Q2, the power supply of the amplifier chip U2 draws Pin, pin, high voltage input pin VI+, low-voltage input pin VI- connect respectively the mu balanced circuit 2, the partial pressure The first end of resistance R9, the mu balanced circuit 2, the divider resistance R10 is connected to second end and ground of the divider resistance R9 Between, second end of the negative electrode of the diode D2 and the divider resistance R9 connects the load circuit.
It should be noted that protection circuit 3 is used to protect current foldback circuit and load circuit, and specifically, the protection electricity Protection current foldback circuit and load are played by turning on and off the power supply of the current foldback circuit and load circuit in road 3 Circuit function;In addition, the protection circuit 3 is additionally operable to prevent the both positive and negative polarity reversal connection of the power supply in power circuit, if reversal connection, burnt Stream protection circuit and load circuit.
It should be noted that mu balanced circuit 2 is used to provide certain voltage.In the present embodiment, the mu balanced circuit 2 is by electricity After the voltage step-down of source circuit, there is provided predetermined voltage to the power pins of amplifier chip U2 are powered;Simultaneously, it is also amplification The low-voltage input pin VI- of device chip U2 provides reference voltage.
Fig. 2 shows the physical circuit of current foldback circuit provided in an embodiment of the present invention, for convenience of description, only illustrates The part related to the embodiment of the present invention, details are as follows.
Used as one embodiment of the invention, the protection circuit 3 includes:
Diode D1, fuse F1 and switch S1;
The anode and negative electrode of the diode D1 connect respectively the first end of the power circuit and the fuse F1, described The first end of switch S1 meets respectively the second end and the mu balanced circuit 2 of the fuse F1, the relay K1 with the second end The first controlled end and the second controlled end connect first end and second end of the switch S1 respectively.
Used as one embodiment of the invention, the mu balanced circuit 2 includes:
It is divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, steady Pressure diode DZ1, voltage stabilizing chip U1 and switching tube 21;
The first end of the divider resistance R1 and the second end connect respectively second end and the pole of the voltage stabilizing two of the switch S1 The negative electrode of pipe DZ1, negative electrode pin K, negative electrode pin A, low reference pin R of voltage stabilizing chip U1 connect respectively the Zener diode The anode of DZ1, the first end of the divider resistance R5, negative electrode pin K of voltage stabilizing chip U1 connects low reference pin R, described The low-voltage input pin VI- of amplifier chip U2 connects second end of the divider resistance R5, and the divider resistance R6 is connected to Between second end and ground of the divider resistance R5, control end, the low-voltage end of the switching tube 21 connect respectively the voltage stabilizing two The power pins of the negative electrode of pole pipe DZ1, the amplifier chip U2, the divider resistance R2, divider resistance R3, divider resistance R4 It is connected between second end of the switch S1 and the high voltage end of the switching tube 21, second termination of the switch S1 First control signal of the relay K1.
In the present embodiment, by low reference pin R of voltage stabilizing chip U1 for amplifier chip U2 low-voltage input pin VI- provides reference voltage.User can select voltage stabilizing chip U1 of different model according to the needs for selecting reference voltage.
It should be noted that the control end of the switching tube 21, the power pins of the amplifier chip U2 are and power supply Pin VCC connects.
Used as one embodiment of the invention, the switching tube 21 adopts NPN type triode Q1, NPN type triode Q1 Colelctor electrode, base stage, emitter stage are respectively high voltage end, control end, the low-voltage end of the switching tube 21.
Fig. 3 shows another physical circuit of current foldback circuit provided in an embodiment of the present invention, for convenience of description, only The part related to the embodiment of the present invention is shown, details are as follows.
Used as one embodiment of the invention, the switching tube 21 adopts N-type metal-oxide-semiconductor Q3, drain electrode, the grid of the N-type metal-oxide-semiconductor Q3 Pole, source electrode are respectively hot end, control end, the cold end of the switching tube 21.
Used as another embodiment of the present invention, present invention also offers a kind of light fixture, the light fixture is including power circuit and bears Circuit is carried, the light fixture also includes current foldback circuit, and the current foldback circuit also includes:
Protection circuit 3, mu balanced circuit 2, relay K1, PNP type triode Q2, diode D2, divider resistance R7, shunting electricity Resistance R8, amplifier chip U2, divider resistance R9 and divider resistance R10;
The protection circuit 3 connects respectively the power circuit and the mu balanced circuit 2, and the first of the relay K1 is controlled End termination controlled with second protection circuit 3, first control signal and the second control signal point of the relay K1 The emitter stage of the mu balanced circuit 2 and PNP type triode Q2 is not connect, the anode and negative electrode of the diode D2 meet respectively institute Second control signal and the first control signal of relay K1 are stated, the divider resistance R7 is connected to the pole of the positive-negative-positive three Between the emitter stage and base stage of pipe Q2, the shunt resistance R8 is connected to the base stage and amplifier core of PNP type triode Q2 Between the output pin of piece U2, the grounded collector of PNP type triode Q2, the power pins of the amplifier chip U2, Ground pin, high voltage input pin, low-voltage input pin connect respectively the mu balanced circuit 2, the of the divider resistance R9 One end, the mu balanced circuit 2, the divider resistance R10 is connected between second end of the divider resistance R9 and ground, and described two Second end of the negative electrode of pole pipe D2 and the divider resistance R9 connects the load circuit.
Used as another embodiment of the present invention, the protection circuit 3 includes:
Diode D1, fuse F1 and switch S1;
The anode and negative electrode of the diode D1 connect respectively the first end of the power circuit and the fuse F1, described The first end of switch S1 meets respectively the second end and the mu balanced circuit 2 of the fuse F1, the relay K1 with the second end The first controlled end and the second controlled end connect first end and second end of the switch S1 respectively.
Used as another embodiment of the present invention, the mu balanced circuit 2 includes:
It is divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, steady Pressure diode DZ1, voltage stabilizing chip U1 and switching tube 21;
The first end of the divider resistance R1 and the second end connect respectively second end and the pole of the voltage stabilizing two of the switch S1 The negative electrode of pipe DZ1, negative electrode pin, negative electrode pin, the low reference pin of voltage stabilizing chip U1 meet respectively the Zener diode DZ1 Anode, the first end of the divider resistance R5, the negative electrode pin of voltage stabilizing chip U1 connects low reference pin, the amplification The low-voltage input pin of device chip U2 connects second end of the divider resistance R5, and the divider resistance R6 is connected to the partial pressure Between second end of resistance R5 and ground, control end, the low-voltage end of the switching tube 21 connect respectively the Zener diode DZ1's The power pins of negative electrode, the amplifier chip U2, the divider resistance R2, divider resistance R3, divider resistance R4 connect respectively Between second end of the switch S1 and the high voltage end of the switching tube 21, the second termination relay of the switch S1 First control signal of device K1.
As another embodiment of the present invention, the switching tube 21 adopt N-type metal-oxide-semiconductor Q3, the drain electrode of the N-type metal-oxide-semiconductor Q3, Grid, source electrode are respectively hot end, control end, the cold end of the switching tube 21.
Used as another embodiment of the present invention, the switching tube 21 adopts NPN type triode Q1, NPN type triode Q1 Colelctor electrode, base stage, emitter stage be respectively high voltage end, control end, the low-voltage end of the switching tube 21.
In order to preferably explain the present invention, NPN type is adopted using voltage stabilizing chip TL431, switching tube 21 with voltage stabilizing chip U1 As a example by triode Q1, with reference to Fig. 2 the operation principle of current foldback circuit is illustrated:
Diode D1 ensure that the cathode output end of power circuit connects the anode of diode D1, the normal work of current foldback circuit Make;So as to diode D1 efficiently avoid the both positive and negative polarity reversal connection of the power supply of power circuit, efficiently avoid and burns excessively stream guarantor The hidden danger of protection circuit and load circuit.
After user presses for the first time switch S1, the conducting of NPN type triode Q2, relay K1 closures.Simultaneously, NPN type Triode Q1 is turned on, and by protection circuit 3 to the continued power of mu balanced circuit 2, the voltage that power circuit is provided is passed through power circuit After voltage stabilizing chip TL431, Zener diode DZ1 process, provided to amplifier chip U2 by the emitter stage of NPN type triode Q1 The power supply of burning voltage;Simultaneously, voltage stabilizing chip TL431 through divider resistance R5, divider resistance R6 to amplifier chip U2 Low-voltage input pin VI- provide reference voltage.At this moment, after disconnecting switch S1, the relay K1 that power circuit passes through closure, To current foldback circuit and load circuit continued power.
During load circuit normal work, the electric current of load circuit is normal, and by divider resistance R10 the electric current is gathered, and loads The electric current of circuit reacts for voltage on divider resistance R10;By voltage and base after divider resistance R9 and divider resistance R10 series connection Quasi- voltage ratio is compared with reference voltage can be more than the voltage after divider resistance R9 and divider resistance R10 series connection, and amplifier chip U2's is defeated Go out pin VO output low levels, so as to NPN type triode Q2 is tended to remain on.
When the electric current of load circuit is excessive, the super-high-current of load circuit is gathered by divider resistance R10;So as to, point Voltage after piezoresistance R9 and divider resistance R10 series connection can be more than reference voltage, and the output pin VO of amplifier chip U2 is exported High level, so as to NPN type triode Q2 cut-off, relay K1 disconnects;So as to the interrupting power circuit of protection circuit 3 to excessively stream is protected The power supply that protection circuit and load circuit are provided.When needing power circuit to power to current foldback circuit and load circuit again, User is needed to press switch S1 again.
In embodiments of the present invention, the electric current of load circuit is gathered by divider resistance R10, if divider resistance R9 and partial pressure Voltage after resistance R10 series connection is less than reference voltage, then power circuit continues to be powered to current foldback circuit and load circuit;If Voltage after divider resistance R9 and divider resistance R10 series connection is more than reference voltage, then relay K1 interrupting power circuits are to excessively stream The power supply of protection circuit and load circuit;So as to be effectively protected current foldback circuit and load circuit.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (6)

1. a kind of current foldback circuit, the input and output end of the current foldback circuit connect respectively power circuit and load electricity Road, it is characterised in that the current foldback circuit includes:
Protection circuit, mu balanced circuit, relay K1, PNP type triode Q2, diode D2, divider resistance R7, shunt resistance R8, Amplifier chip U2, divider resistance R9 and divider resistance R10;
The protection circuit connects respectively the power circuit and the mu balanced circuit, first controlled end of the relay K1 and The two controlled termination protection circuits, first control signal and the second control signal of the relay K1 connect respectively described The emitter stage of mu balanced circuit and PNP type triode Q2, the anode and negative electrode of the diode D2 connect respectively the relay Second control signal and the first control signal of K1, the divider resistance R7 is connected to sending out for PNP type triode Q2 Between emitter-base bandgap grading and base stage, the base stage that the shunt resistance R8 is connected to PNP type triode Q2 is defeated with amplifier chip U2 Go out between pin, the grounded collector of PNP type triode Q2, the power pins of the amplifier chip U2, pin, height Voltage input pin, low-voltage input pin connect respectively the mu balanced circuit, it is the first end of the divider resistance R9, described Mu balanced circuit, the divider resistance R10 is connected between second end of the divider resistance R9 and ground, the moon of the diode D2 Second end of pole and the divider resistance R9 connects the load circuit;
The protection circuit includes:
Diode D1, fuse F1 and switch S1;
The anode and negative electrode of the diode D1 connect respectively the first end of the power circuit and the fuse F1, the switch The first end of S1 and the second end connect respectively second end of the fuse F1 and the mu balanced circuit, and the first of the relay K1 Controlled end and the second controlled end connect respectively the first end of the switch S1 and the second end;
The mu balanced circuit includes:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, voltage stabilizing two Pole pipe DZ1, voltage stabilizing chip U1 and switching tube;
The first end of the divider resistance R1 and the second end meet respectively second end of the switch S1 and the Zener diode DZ1 Negative electrode, negative electrode pin, negative electrode pin, the low reference pin of voltage stabilizing chip U1 connect respectively the sun of the Zener diode DZ1 Pole, the first end of the divider resistance R5, the negative electrode pin of voltage stabilizing chip U1 connects low reference pin, the amplifier core The low-voltage input pin of piece U2 connects second end of the divider resistance R5, and the divider resistance R6 is connected to the divider resistance Between second end of R5 and ground, control end, the low-voltage end of the switching tube connect respectively the negative electrode of the Zener diode DZ1, The power pins of the amplifier chip U2, the divider resistance R2, divider resistance R3, divider resistance R4 are connected to described Between second end of switch S1 and the high voltage end of the switching tube, the second of the switch S1 terminates the of the relay K1 One control signal.
2. current foldback circuit as claimed in claim 1, it is characterised in that the switching tube adopts N-type metal-oxide-semiconductor Q3, the N The drain electrode of type metal-oxide-semiconductor Q3, grid, source electrode are respectively hot end, control end, the cold end of the switching tube.
3. current foldback circuit as claimed in claim 1, it is characterised in that the switching tube adopts NPN type triode Q1, institute State high voltage end, control end, low-voltage that the colelctor electrode of NPN type triode Q1, base stage, emitter stage are respectively the switching tube End.
4. a kind of light fixture, the light fixture includes power circuit and load circuit, it is characterised in that the light fixture is also protected including excessively stream Protection circuit, the current foldback circuit also includes:
Protection circuit, mu balanced circuit, relay K1, PNP type triode Q2, diode D2, divider resistance R7, shunt resistance R8, Amplifier chip U2, divider resistance R9 and divider resistance R10;
The protection circuit connects respectively the power circuit and the mu balanced circuit, first controlled end of the relay K1 and The two controlled termination protection circuits, first control signal and the second control signal of the relay K1 connect respectively described The emitter stage of mu balanced circuit and PNP type triode Q2, the anode and negative electrode of the diode D2 connect respectively the relay Second control signal and the first control signal of K1, the divider resistance R7 is connected to sending out for PNP type triode Q2 Between emitter-base bandgap grading and base stage, the base stage that the shunt resistance R8 is connected to PNP type triode Q2 is defeated with amplifier chip U2 Go out between pin, the grounded collector of PNP type triode Q2, the power pins of the amplifier chip U2, pin, height Voltage input pin, low-voltage input pin connect respectively the mu balanced circuit, it is the first end of the divider resistance R9, described Mu balanced circuit, the divider resistance R10 is connected between second end of the divider resistance R9 and ground, the moon of the diode D2 Second end of pole and the divider resistance R9 connects the load circuit;
The protection circuit includes:
Diode D1, fuse F1 and switch S1;
The anode and negative electrode of the diode D1 connect respectively the first end of the power circuit and the fuse F1, the switch The first end of S1 and the second end connect respectively second end of the fuse F1 and the mu balanced circuit, and the first of the relay K1 Controlled end and the second controlled end connect respectively the first end of the switch S1 and the second end;
The mu balanced circuit includes:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, voltage stabilizing two Pole pipe DZ1, voltage stabilizing chip U1 and switching tube;
The first end of the divider resistance R1 and the second end meet respectively second end of the switch S1 and the Zener diode DZ1 Negative electrode, negative electrode pin, negative electrode pin, the low reference pin of voltage stabilizing chip U1 connect respectively the sun of the Zener diode DZ1 Pole, the first end of the divider resistance R5, the negative electrode pin of voltage stabilizing chip U1 connects low reference pin, the amplifier core The low-voltage input pin of piece U2 connects second end of the divider resistance R5, and the divider resistance R6 is connected to the divider resistance Between second end of R5 and ground, control end, the low-voltage end of the switching tube connect respectively the negative electrode of the Zener diode DZ1, The power pins of the amplifier chip U2, the divider resistance R2, divider resistance R3, divider resistance R4 are connected to described Between second end of switch S1 and the high voltage end of the switching tube, the second of the switch S1 terminates the of the relay K1 One control signal.
5. light fixture as claimed in claim 4, it is characterised in that the switching tube adopts N-type metal-oxide-semiconductor Q3, the N-type metal-oxide-semiconductor The drain electrode of Q3, grid, source electrode are respectively hot end, control end, the cold end of the switching tube.
6. light fixture as claimed in claim 4, it is characterised in that the switching tube adopts NPN type triode Q1, the NPN type The colelctor electrode of triode Q1, base stage, emitter stage are respectively high voltage end, control end, the low-voltage end of the switching tube.
CN201310180934.3A 2013-05-15 2013-05-15 Over-current protection circuit and lamp Active CN104167708B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310180934.3A CN104167708B (en) 2013-05-15 2013-05-15 Over-current protection circuit and lamp

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Application Number Priority Date Filing Date Title
CN201310180934.3A CN104167708B (en) 2013-05-15 2013-05-15 Over-current protection circuit and lamp

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CN104167708A CN104167708A (en) 2014-11-26
CN104167708B true CN104167708B (en) 2017-05-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106226681A (en) * 2016-08-04 2016-12-14 刘超 A kind of power circuit failure detector circuit and electronic equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1693904A (en) * 2005-06-06 2005-11-09 陈庆伟 Self-control electric limit type single-phase watt-hour meter
CN2807690Y (en) * 2005-07-07 2006-08-16 蓝宗群 Car light power regulating device
CN102931629A (en) * 2012-10-16 2013-02-13 东南大学 Quick relay protection method and circuit for current type transmitting signal input channel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1693904A (en) * 2005-06-06 2005-11-09 陈庆伟 Self-control electric limit type single-phase watt-hour meter
CN2807690Y (en) * 2005-07-07 2006-08-16 蓝宗群 Car light power regulating device
CN102931629A (en) * 2012-10-16 2013-02-13 东南大学 Quick relay protection method and circuit for current type transmitting signal input channel

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