CN103347330A - LED driving control circuit - Google Patents
LED driving control circuit Download PDFInfo
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- CN103347330A CN103347330A CN2013102494514A CN201310249451A CN103347330A CN 103347330 A CN103347330 A CN 103347330A CN 2013102494514 A CN2013102494514 A CN 2013102494514A CN 201310249451 A CN201310249451 A CN 201310249451A CN 103347330 A CN103347330 A CN 103347330A
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Abstract
The invention relates to an LED driving control circuit which comprises a driving chip U1 and a field effect transistor Q1. A driving output end of the driving chip U1 is connected with a grid electrode of the field effect transistor Q1 through a reversely-connected diode D11. A collector of an audion Q2 is connected with the grid electrode of the field effect transistor Q1. A base electrode of the audion Q2 is connected with a source electrode of the field effect transistor Q1. An emission electrode of the audion Q2 is connected with the ground. An anode of a thyristor VT is connected with the driving output end of the driving chip U1. A cathode of the thyristor VT is connected with the ground. A 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 subjected to breakdown, short circuiting to the ground of the collector of the audion Q2 is carried out, the upper end of a current limiting resistor R15 generates high voltages, and meanwhile the high voltages are added to the gate electrode of the thyristor VT through the capacitor C12, so that the gate electrode is connected, when high voltages exist at the grid electrode of the field effect transistor Q1, a voltage stabilizing tube ZD1 and a voltage stabilizing tube ZD2 are subjected to breakdown, when grid electrode voltages of the field effect transistor Q1 are too high, large currents can flow through the voltage stabilizing tube ZD1, the voltage stabilizing tube ZD2 and the thyristor VT, a quick-break fuse wire is quickly fused, and the driving chip U1 is effectively protected.
Description
Technical field
The present invention relates to a kind of power circuit, specifically, relate to a kind of LED Drive and Control Circuit of the LED of being applicable to lighting lamp power, belong to electronic technology field.
Background technology
At present, traditional LED illuminating lamp drive 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, it is drive output meets field effect transistor Q1 through the diode D11 of reversal connection grid, 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 first primary coil among the switch transformer T, the negative pole of diode D6 is through parallel resistor R2, capacitor C 5 connects the other end and the power supply of switch transformer T primary coil.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem: because field effect transistor Q1 is consumable accessory, punch through damage takes place easily, when field effect transistor Q1 punctures, the high pressure of field effect transistor Q1 drain electrode directly is added to grid, and is added to the drive output that drives chip U1 through resistance R 13, diode D11, makes to drive chip U1 damage, poor stability has improved use cost.
Summary of the invention
The technical problem to be solved in the present invention is at 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 present invention is by the following technical solutions: a kind of LED Drive and Control Circuit, comprise and drive chip U1 and field effect transistor Q1, drive the drive output of chip U1 through the grid that the diode D11 of reversal connection meets field effect transistor Q1, 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 comprise 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 comprise 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 present invention adopts above technical scheme, compared with prior art, have the following advantages: after field effect transistor Q1 punctures, have big 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 namely the gate short of field effect pipe Q1 makes high voltage can not be added to the drive output that drives chip U1 to ground.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, and driving chip U1 is protected.Voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2: when the grid of field effect pipe Q1 had high voltage to occur, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 punctured, and driving chip U1 is protected.When the grid voltage of field effect pipe Q1 is too high; have big electric current and flow through voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 and thyristor VT, quick-break fuse FU quick-break is thoroughly isolated driving chip U1 and high voltage; protection drives chip U1 effectively, has realized multiple protective.
The present invention is described in detail below in conjunction with drawings and Examples.
Description of drawings
Accompanying drawing 3 is circuit diagrams of led drive circuit in the embodiment of the invention;
Among the 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 Fig. 2, shown in Figure 3, a kind of led drive circuit comprises 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.
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; the model that drives chip U1 is SA7527; drive 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; 3 pin that drive chip U1 connect PFC correcting circuit 8; 4 pin that drive chip U1 connect protective circuit 7; 5 pin that drive chip U1 connect the positive pole of diode D5 in the power circuit 1 through resistance R 6; drive the 6 pin ground of chip U1; 7 pin that drive chip U1 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 the power circuit 1, and 8 pin that drive chip U1 connect the negative pole of diode D5 in the power circuit 1 through resistance R 5.
Field effect transistor Q1 is consumable accessory, and punch through damage easily takes place.When himself damaging, the high-low pressure of drain electrode can directly be added to the drive output that drives chip U1 from grid, makes to drive chip U1 punch through damage, add protective circuit after, can protect the driving chip effectively.
This circuit is multiple protective circuit.
After field effect transistor Q1 punctures, have big 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 namely the gate short of field effect pipe Q1 makes high voltage can not be added to the drive output that drives chip U1 to ground.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, and driving chip U1 is protected.Voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2: when the grid of field effect pipe Q1 had high voltage to occur, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 punctured, and driving chip U1 is protected.When the grid voltage of field effect pipe Q1 is too high, have big electric current and flow through voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2 and thyristor VT, quick-break fuse FU quick-break is thoroughly isolated driving chip U1 and high voltage, and protection drives chip U1 effectively.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; be in order to make those skilled in the art can better understand content of the present invention; should not be understood as limiting the scope of the invention; adopt other conventional circuit such as power circuit, output circuit, voltage stabilizing circuit, amplifying circuit, sample circuit, Drive and Control Circuit and PFC correcting circuit; so long as the improvement of doing according to technical solution of the present invention all falls into protection scope of the present invention.
Claims (6)
1. a LED Drive and Control Circuit comprises driving chip U1 and field effect transistor Q1, and drive the drive output of chip U1 through the grid that the diode D11 of reversal connection meets field effect transistor Q1, 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.
Priority Applications (1)
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CN201310249451.4A CN103347330B (en) | 2013-06-22 | 2013-06-22 | LED driving control circuit |
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CN201310249451.4A CN103347330B (en) | 2013-06-22 | 2013-06-22 | LED driving control circuit |
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CN103347330A true CN103347330A (en) | 2013-10-09 |
CN103347330B CN103347330B (en) | 2015-04-08 |
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CN201310249451.4A Expired - Fee Related CN103347330B (en) | 2013-06-22 | 2013-06-22 | LED driving control circuit |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105704873A (en) * | 2014-11-28 | 2016-06-22 | 昱京能源科技股份有限公司 | Isolation type light modulation circuit structure |
CN109361382A (en) * | 2018-12-18 | 2019-02-19 | 天津瑞能电气有限公司 | A kind of field-effect tube driving circuit |
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US6229180B1 (en) * | 1998-01-27 | 2001-05-08 | Fuji Electric Co., Ltd. | MOS type semiconductor apparatus |
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CN201001216Y (en) * | 2007-01-24 | 2008-01-02 | 先礼群 | High power LED drive circuit |
CN102333403A (en) * | 2011-06-29 | 2012-01-25 | 林万炯 | Protection circuit for preventing LED from impact |
CN102573175A (en) * | 2010-12-14 | 2012-07-11 | 成都九洲迪飞科技有限责任公司 | Single-stage flyback driving power supply |
CN203352883U (en) * | 2013-06-22 | 2013-12-18 | 潍坊晶兰电源技术有限公司 | A LED driving and controlling circuit |
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2013
- 2013-06-22 CN CN201310249451.4A patent/CN103347330B/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US6222322B1 (en) * | 1997-09-08 | 2001-04-24 | Q Technology Incorporated | Ballast with lamp abnormal sensor and method therefor |
US6172383B1 (en) * | 1997-12-31 | 2001-01-09 | Siliconix Incorporated | Power MOSFET having voltage-clamped gate |
US6229180B1 (en) * | 1998-01-27 | 2001-05-08 | Fuji Electric Co., Ltd. | MOS type semiconductor apparatus |
CN200954802Y (en) * | 2006-10-08 | 2007-10-03 | 许通车 | Vehicle steering signal electronic flashing device |
CN201001216Y (en) * | 2007-01-24 | 2008-01-02 | 先礼群 | High power LED drive circuit |
CN102573175A (en) * | 2010-12-14 | 2012-07-11 | 成都九洲迪飞科技有限责任公司 | Single-stage flyback driving power supply |
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CN203352883U (en) * | 2013-06-22 | 2013-12-18 | 潍坊晶兰电源技术有限公司 | A LED driving and controlling circuit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105704873A (en) * | 2014-11-28 | 2016-06-22 | 昱京能源科技股份有限公司 | Isolation type light modulation circuit structure |
CN105704873B (en) * | 2014-11-28 | 2019-06-21 | 昱京能源科技股份有限公司 | Isolated light adjusting circuit structure |
CN109361382A (en) * | 2018-12-18 | 2019-02-19 | 天津瑞能电气有限公司 | A kind of field-effect tube driving circuit |
CN109361382B (en) * | 2018-12-18 | 2024-01-23 | 天津瑞能电气有限公司 | Field effect transistor driving circuit |
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