CN203352883U - A LED driving and controlling circuit - Google Patents

A LED driving and controlling circuit Download PDF

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Publication number
CN203352883U
CN203352883U CN2013203594549U CN201320359454U CN203352883U CN 203352883 U CN203352883 U CN 203352883U CN 2013203594549 U CN2013203594549 U CN 2013203594549U CN 201320359454 U CN201320359454 U CN 201320359454U CN 203352883 U CN203352883 U CN 203352883U
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China
Prior art keywords
effect transistor
field effect
voltage
resistance
drive
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Expired - Fee Related
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CN2013203594549U
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Chinese (zh)
Inventor
李建军
刘祖社
邱纯勇
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WEIFANG KINGLAND POWER TECHNOLOGY Co Ltd
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WEIFANG KINGLAND POWER TECHNOLOGY Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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Abstract

The utility model relates to a LED driving and controlling circuit comprising a driving chip U1 and a field effect transistor Q1. The driving output end of the driving chip U1 is connected with the grid electrode of the driving chip U1 via a reversely-connected diode D11. The collector electrode of a triode Q2 is connected with the grid electrode of the field effect transistor Q1. The base electrode of the triode Q2 is connected with the source electrode of the field effect transistor Q1. The emitter electrode of the triode Q2 is connected with ground. The anode of a thyristor VT is connected with the driving output end of the driving chip U1, while the cathode of the thyristor VT is connected with ground. The gate electrode of the thyristor VT is connected with one end of a resistor R12 and one end of a capacitor C12. After the field effect transistor Q1 is broken down, the collector electrode of the triode Q2 is connected with the ground in a short circuit manner and high voltage generated on the top end of a current-limiting resistor R15 is simultaneously applied to the gate electrode of the thyristor VT via the capacitor C12 to activate the thyristor VT. When high voltage is generated on the grid electrode of the field effect transistor Q1, a voltage-regulator tube ZD1 and a voltage-regulator tube ZD2 are broken down. When over-high voltage is generated on the grid electrode of the field effect transistor Q1, heavy current passes through the voltage-regulator tube ZD1, the voltage-regulator tube ZD2, and the thyristor VT and a fast-fused fuse FU is fused fast. Therefore, the driving chip U1 is protected effectively.

Description

A kind of LED Drive and Control Circuit
Technical field
The utility model relates to a kind of power circuit, specifically, relates to a kind of LED Drive and Control Circuit of the LED of being applicable to lighting lamp power, belongs to electronic technology field.
Background technology
At present, traditional LED illuminating lamp driving circuit comprises power circuit 1, output circuit 2, voltage stabilizing circuit 3, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6 and PFC correcting circuit 8, as shown in Figure 1, Drive and Control Circuit 6 comprises driving chip U1, field effect transistor Q1, drive 7 pin of chip U1, be that drive output connects the grid of field effect transistor Q1 through the diode D11 of reversal connection, the source electrode of field effect transistor Q1 is through resistance R 15 ground connection, diode D11 is parallel with resistance R 13, the grid of field effect transistor Q1 is through resistance R 14 ground connection, the drain electrode of field effect transistor Q1 connects the positive pole of diode D6, an end of the first primary coil in switch transformer T, the negative pole of diode D6 is through resistance R in parallel 2, capacitor C 5 connects the other end and the power supply of switch transformer T primary coil.
In realizing the utility model process, utility model people finds in prior art at least to exist following problem: because field effect transistor Q1 is consumable accessory, punch through damage easily occurs, when being on the scene effect pipe Q1 punctures, the high pressure of field effect transistor Q1 drain electrode directly is added to grid, and is added to through resistance R 13, diode D11 the drive output that drives chip U1, makes to drive chip U1 to damage, poor stability, improved use cost.
The utility model content
The technical problems to be solved in the utility model is for above deficiency, and a kind of safe, LED Drive and Control Circuit that use cost is low is provided.
For solving above technical problem, the utility model is by the following technical solutions: a kind of LED Drive and Control Circuit, comprise and drive chip U1 and field effect transistor Q1, the grid that the drive output of driving chip U1 meets field effect transistor Q1 through the diode D11 of reversal connection, it is characterized in that: described Drive and Control Circuit is provided with protective circuit;
Described protective circuit comprises triode Q2, and the collector electrode of triode Q2 connects the grid of field effect transistor Q1;
The base stage of described triode Q2 connects the source electrode of field effect transistor Q1, the grounded emitter of triode Q2.
A kind of prioritization scheme, described protective circuit comprises resistance R 12, capacitor C 12 and thyristor VT;
The anode of described thyristor VT connects the drive output that drives chip U1, the minus earth of thyristor VT;
The end of the gate pole connecting resistance R12 of described thyristor VT and an end of capacitor C 12;
The other end ground connection of described resistance R 12, the source electrode of another termination field effect transistor Q1 of capacitor C 12.
Another kind of prioritization scheme, described protective circuit comprises voltage-stabiliser tube ZD1 and voltage-stabiliser tube ZD2;
The negative pole of described voltage-stabiliser tube ZD1 connects the drive output that drives chip U1, the plus earth of voltage-stabiliser tube ZD1;
The negative pole of described voltage-stabiliser tube ZD2 connects the positive pole of diode D11, the plus earth of voltage-stabiliser tube ZD2.
Another prioritization scheme, described protective circuit comprises fast disconnected protective tube FU;
Described fast disconnected protective tube FU is arranged between the collector electrode of the negative pole of voltage-stabiliser tube ZD2 and triode Q2.
Further, 4 pin of described driving chip U1 connect the source electrode of field effect transistor Q1.
Again further, described Drive and Control Circuit also comprises resistance R 14 and current-limiting resistance R15;
The source electrode of described field effect transistor Q1 is through current-limiting resistance R15 ground connection, and resistance R 14 is connected between the source electrode of the grid of field effect transistor Q1 and field effect transistor Q1.
After the utility model adopts above technical scheme, compared with prior art, have the following advantages: after field effect transistor Q1 punctures, have large electric current and flow through current-limiting resistance R15, produce high voltage in current-limiting resistance R15 upper end, this high voltage can be added to the base stage of triode Q2, make triode Q2 saturated rapidly, the collector electrode of triode Q2 is shorted to ground, and the gate short of field effect transistor Q1, to ground, makes high voltage can not be added to the drive output that drives chip U1.Thereby protection drives chip U1.The high voltage that current-limiting resistance R15 upper end produces is added to the gate pole of thyristor VT simultaneously by capacitor C 12, make its conducting, and the anode voltage of thyristor VT is reduced to 0V, makes to drive chip U1 to be protected.Voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2: when the grid of field effect transistor Q1 has high voltage to occur, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 puncture, and make to drive chip U1 to be protected.When the grid voltage of field effect transistor Q1 is too high; have large electric current and flow through voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 and thyristor VT, quick-break fuse FU quick-break, make to drive chip U1 and high voltage thoroughly to be isolated; protection drives chip U1 effectively, has realized multiple protective.
Below in conjunction with drawings and Examples, the utility model is elaborated.
The accompanying drawing explanation
Accompanying drawing 1 is the circuit diagram of Drive and Control Circuit in prior art;
Accompanying drawing 2 is circuit block diagrams of LED drive circuit in the utility model embodiment;
Accompanying drawing 3 is circuit diagrams of LED drive circuit in the utility model embodiment;
In figure,
The 1-power circuit, 2-output circuit, 3-voltage stabilizing circuit, 4-amplifying circuit, 5-sample circuit, 6-Drive and Control Circuit, 7-protective circuit, 8-PFC correcting circuit, 9-LED illuminating lamp.
Embodiment
Embodiment, as shown in Figure 2 and Figure 3, a kind of LED drive circuit, comprise power circuit 1, output circuit 2, voltage stabilizing circuit 3, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6, protective circuit 7 and the PFC correcting circuit 8 of electrical connection.
Power circuit 1 comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, resistance R 1, resistance R 2, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5 and switch transformer T, diode D1, diode D2, diode D3, the rectifier bridge that diode D4 forms, switch transformer T has the first primary coil, the second primary coil and secondary coil, capacitor C 3 is connected between the positive pole and ground of rectifier bridge, the positive pole of a termination rectifier bridge of resistance R 1, an end of another termination capacitor C 4 of resistance R 1, the negative pole of diode D5, the other end ground connection of capacitor C 4, the positive pole of diode D5 connects an end of the first primary coil, the other end ground connection of the first primary coil, an end of capacitor C 5, the positive pole of one termination rectifier bridge of resistance R 2, the other end of capacitor C 5, the negative pole of another terminating diode D6 of resistance R 2, the positive pole of a termination rectifier bridge of the second primary coil, the positive pole of another terminating diode D6 of the second primary coil, capacitor C 5, resistance R 2 and diode D6 form surge absorbing circuit, and secondary coil connects output circuit 2.
Output circuit 2 comprises resistance R 3, resistance R 4, diode D7, diode D8, diode D9, capacitor C 6, capacitor C 7, capacitor C 8, capacitor C 9, the positive pole of one terminating diode D7 of secondary coil, one end of resistance R 3, one end of another termination capacitor C 6 of resistance R 3, the negative pole of another terminating diode D7 of capacitor C 6, one end of capacitor C 7, one end of capacitor C 8 and voltage stabilizing circuit 3, the other end of capacitor C 7, the centre tap of another termination secondary coil of capacitor C 8, one end of capacitor C 9, the negative pole of diode D9 and voltage stabilizing circuit 3, the negative pole of another terminating diode D8 of capacitor C 9, voltage stabilizing circuit 3, the positive pole of diode D8 connects the other end of secondary coil, the positive pole of diode D9 connects voltage stabilizing circuit 3, resistance R 4 is in parallel with diode D9, resistance R 3, capacitor C 6 is used for abating the noise.Voltage stabilizing circuit 3 connects LED illuminating lamp 9, and voltage stabilizing circuit 3 adopts traditional voltage stabilizing circuit at present, in accompanying drawing 2, does not draw.
Resistance R 8, resistance R 9, resistance R 10, resistance R 11, capacitor C 11 and triode Q3, triode Q4 form amplifying circuit 4, and the input of amplifying circuit 4 accesses sample circuit 5, the output termination Drive and Control Circuit 6 of amplifying circuit 4.
Sample circuit 5 comprises photoelectrical coupler U2, output termination amplifying circuit 4, Drive and Control Circuit 6.The positive pole of photoelectrical coupler U2, negative pole connect respectively voltage stabilizing circuit 3, and the magnitude of voltage of voltage stabilizing circuit 3 is carried out to voltage sampling.
Drive and Control Circuit 6 comprises driving chip U1, resistance R 7, resistance R 24, capacitor C 10, diode D10, diode D11, resistance R 13, resistance R 14, current-limiting resistance R15, field effect transistor Q1, driving the model of chip U1 is SA7527, drives the end of the 1 pin connecting resistance R7 of chip U1, one end of resistance R 24, one end of capacitor C 10, the other end of resistance R 24, another termination of capacitor C 10 drives 2 pin of chip U1, the output of amplifying circuit 4, the input of another termination amplifying circuit 4 of resistance R 7, the positive pole of diode D10, the emitter of photoelectrical coupler U2, the negative pole of diode D10 connects the collector electrode of photoelectrical coupler U2, drive 8 pin of chip U1, drive 3 pin of chip U1 to connect PFC correcting circuit 8, drive 4 pin of chip U1 to connect protective circuit 7,5 pin that drive chip U1 connect the positive pole of diode D5 in power circuit 1 through resistance R 6, drive the 6 pin ground of chip U1, drive 7 pin of chip U1 to connect protective circuit 7, one end of resistance R 13, the negative pole of diode D11, the other end of resistance R 13, the positive pole of diode D11 connects the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is through current-limiting resistance R15 ground connection, resistance R 14 is connected between the source electrode of the grid of field effect transistor Q1 and field effect transistor Q1, the drain electrode of field effect transistor Q1 connects the positive pole of diode D6 in power circuit 1, and 8 pin that drive chip U1 connect the negative pole of diode D5 in power circuit 1 through resistance R 5.
Protective circuit 7 comprises resistance R 12, capacitor C 12, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, thyristor VT, triode Q2 and be arranged on the positive pole of diode D11 and the grid of field effect transistor Q1 between fast disconnected protective tube FU, the negative pole of voltage-stabiliser tube ZD1 connects 7 pin that drive chip U1, the plus earth of voltage-stabiliser tube ZD1, the anode of thyristor VT connects 7 pin that drive chip U1, the minus earth of thyristor VT, the end of the gate pole connecting resistance R12 of thyristor VT, one end of capacitor C 12, the other end ground connection of resistance R 12, another termination of capacitor C 12 drives 4 pin of chip U1, the source electrode of field effect transistor Q1, the negative pole of voltage-stabiliser tube ZD2 connects the positive pole of diode D11 in Drive and Control Circuit 6, the plus earth of voltage-stabiliser tube ZD2, the collector electrode of triode Q2 connects the grid of field effect transistor Q1 in Drive and Control Circuit 6, the base stage of triode Q2 connects the source electrode of field effect transistor Q1 in Drive and Control Circuit 6, the grounded emitter of triode Q2, 7 pin of driving chip U1 drive the drive output of chip U1.
PFC correcting circuit 8 comprises resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, capacitor C 13, capacitor C 14, triode Q5 and triode Q6, one end of resistance R 16, an end of resistance R 2 in one termination power circuit 1 of resistance R 17, the other end of resistance R 16 is through the end of resistance R 18 connecting resistance R20, the collector electrode of triode Q5, the other end ground connection of resistance R 20, the base stage of triode Q5 is unsettled, the emitter of triode Q5 connects the base stage of triode Q6 through resistance R 23, one end of capacitor C 13, the other end ground connection of capacitor C 13, the grounded emitter of triode Q6, triode Q6 collector electrode is through the end of resistance R 22 connecting resistance R19, one end of resistance R 21, 3 pin of one end of capacitor C 14 and driving chip U1, the other end ground connection of resistance R 21, the other end of the other end connecting resistance R17 of resistance R 19, the other end ground connection of capacitor C 14.
Field effect transistor Q1 is consumable accessory, and punch through damage easily occurs.When himself damages, the high-low pressure of drain electrode can directly be added to from grid the drive output that drives chip U1, makes to drive chip U1 punch through damage, after adding protective circuit, can effectively protect the driving chip.
This circuit is multiple protective circuit.
After field effect transistor Q1 punctures, have large electric current and flow through current-limiting resistance R15, produce high voltage in current-limiting resistance R15 upper end, this high voltage can be added to the base stage of triode Q2, make triode Q2 saturated rapidly, the collector electrode of triode Q2 is shorted to ground, and the gate short of field effect transistor Q1, to ground, makes high voltage can not be added to the drive output that drives chip U1.Thereby protection drives chip U1.The high voltage that current-limiting resistance R15 upper end produces is added to the gate pole of thyristor VT simultaneously by capacitor C 12, make its conducting, and the anode voltage of thyristor VT is reduced to 0V, makes to drive chip U1 to be protected.Voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2: when the grid of field effect transistor Q1 has high voltage to occur, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 puncture, and make to drive chip U1 to be protected.When the grid voltage of field effect transistor Q1 is too high, have large electric current and flow through voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 and thyristor VT, quick-break fuse FU quick-break, make to drive chip U1 and high voltage thoroughly to be isolated, and protection drives chip U1 effectively.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; in order to make those skilled in the art can better understand the utility model content; should not be understood as the restriction to the utility model protection range; such as power circuit, output circuit, voltage stabilizing circuit, amplifying circuit, sample circuit, Drive and Control Circuit and PFC correcting circuit adopt other conventional circuit; so long as the improvement of doing according to technical solutions of the utility model all falls into protection range of the present utility model.

Claims (6)

1. a LED Drive and Control Circuit, comprise and drive chip U1 and field effect transistor Q1, the grid that the drive output of driving chip U1 meets field effect transistor Q1 through the diode D11 of reversal connection, and it is characterized in that: described Drive and Control Circuit (6) is provided with protective circuit (7);
Described protective circuit (7) comprises triode Q2, and the collector electrode of triode Q2 connects the grid of field effect transistor Q1;
The base stage of described triode Q2 connects the source electrode of field effect transistor Q1, the grounded emitter of triode Q2.
2. a kind of LED Drive and Control Circuit as claimed in claim 1, it is characterized in that: described protective circuit (7) comprises resistance R 12, capacitor C 12 and thyristor VT;
The anode of described thyristor VT connects the drive output that drives chip U1, the minus earth of thyristor VT;
The end of the gate pole connecting resistance R12 of described thyristor VT and an end of capacitor C 12;
The other end ground connection of described resistance R 12, the source electrode of another termination field effect transistor Q1 of capacitor C 12.
3. a kind of LED Drive and Control Circuit as claimed in claim 2, it is characterized in that: described protective circuit (7) comprises voltage-stabiliser tube ZD1 and voltage-stabiliser tube ZD2;
The negative pole of described voltage-stabiliser tube ZD1 connects the drive output that drives chip U1, the plus earth of voltage-stabiliser tube ZD1;
The negative pole of described voltage-stabiliser tube ZD2 connects the positive pole of diode D11, the plus earth of voltage-stabiliser tube ZD2.
4. a kind of LED Drive and Control Circuit as claimed in claim 3 is characterized in that: described protective circuit (7) comprises fast disconnected protective tube FU;
Described fast disconnected protective tube FU is arranged between the collector electrode of the negative pole of voltage-stabiliser tube ZD2 and triode Q2.
5. a kind of LED Drive and Control Circuit as claimed in claim 4, it is characterized in that: 4 pin of described driving chip U1 connect the source electrode of field effect transistor Q1.
6. as one of them described a kind of LED Drive and Control Circuit of claim 1-5, it is characterized in that: described Drive and Control Circuit (6) also comprises resistance R 14 and current-limiting resistance R15;
The source electrode of described field effect transistor Q1 is through current-limiting resistance R15 ground connection, and resistance R 14 is connected between the source electrode of the grid of field effect transistor Q1 and field effect transistor Q1.
CN2013203594549U 2013-06-22 2013-06-22 A LED driving and controlling circuit Expired - Fee Related CN203352883U (en)

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Application Number Priority Date Filing Date Title
CN2013203594549U CN203352883U (en) 2013-06-22 2013-06-22 A LED driving and controlling circuit

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Application Number Priority Date Filing Date Title
CN2013203594549U CN203352883U (en) 2013-06-22 2013-06-22 A LED driving and controlling circuit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103347330A (en) * 2013-06-22 2013-10-09 潍坊晶兰电源技术有限公司 LED driving control circuit
US9865671B2 (en) 2015-09-03 2018-01-09 Industrial Technology Research Institute Organic light-emitting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103347330A (en) * 2013-06-22 2013-10-09 潍坊晶兰电源技术有限公司 LED driving control circuit
US9865671B2 (en) 2015-09-03 2018-01-09 Industrial Technology Research Institute Organic light-emitting device

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131218

Termination date: 20140622

EXPY Termination of patent right or utility model