CN108243529B - LED dimming driving circuit - Google Patents
LED dimming driving circuit Download PDFInfo
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- CN108243529B CN108243529B CN201611216993.1A CN201611216993A CN108243529B CN 108243529 B CN108243529 B CN 108243529B CN 201611216993 A CN201611216993 A CN 201611216993A CN 108243529 B CN108243529 B CN 108243529B
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention discloses an LED dimming driving circuit, which comprises: the device comprises an RCC constant current driving circuit, an OVP feedback loop and a current acquisition feedback loop; when the output is empty, the OVP feedback loop compares the output voltage of the RCC constant current drive circuit with a reference voltage; when the output voltage of the RCC constant current drive circuit is larger than the reference voltage, the OVP feedback loop switches the starting switching tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output voltage of the RCC constant current drive circuit is reduced; when the output no-load is connected with the load, the current collection feedback loop collects the output current of the RCC constant current drive circuit and compares the output current with a reference current; when the output current of the RCC constant current drive circuit is larger than the reference current, the current acquisition feedback loop switches the starting switch tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output current of the RCC constant current drive circuit is reduced.
Description
Technical Field
The invention relates to an electronic circuit of lighting equipment, in particular to a dimming driving circuit for an LED.
Background
With the technical progress, the advantages of the LED light source in lighting application are gradually highlighted, on one hand, the light efficiency and the color rendering performance of the LED light source are up to or even exceed those of the traditional light source such as an incandescent lamp and a gas discharge fluorescent lamp, and on the other hand, the adjustable capacity of the LED light source is larger in development space than that of the traditional light source, and the LED light source is particularly suitable for the general lighting fields of modern home, business and the like.
However, the lamp realized by the LED light source also has obvious defects, and the driving power source of the LED light source usually needs low voltage in consideration of the output semiconductor device of the LED light source, so that the LED lamp is provided with a corresponding driver. Such drivers often use a switching mode power supply, for example, including a switching transformer, an oscillating circuit, a protection circuit, etc., and are sometimes even applied to ICs in view of dimming functions, accuracy, lifetime, etc. The circuit has the common characteristics of complex circuit and high cost, and is difficult to popularize and use especially in medium-low power LED dimming lamps.
Disclosure of Invention
The invention aims to solve the main technical problems of providing an LED dimming driving circuit which is low in cost, high in reliability and good in compatibility.
In order to solve the technical problem, the present invention provides an LED dimming driving circuit, which is characterized by comprising: the device comprises an RCC constant current driving circuit, an OVP feedback loop and a current acquisition feedback loop;
When the output is idle, the current collection feedback loop does not work, and the OVP feedback loop compares the output voltage of the RCC constant current drive circuit with a reference voltage; when the output voltage of the RCC constant current drive circuit is larger than the reference voltage, the OVP feedback loop switches a starting switch tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output voltage of the RCC constant current drive circuit is reduced;
When the output is connected with a load in an idle state, the output voltage of the RCC constant current driving circuit is always smaller than the reference voltage of the OVP, the OVP feedback loop does not work, and the current collection feedback loop collects the output current of the RCC constant current driving circuit and compares the output current with a reference current; when the output current of the RCC constant current drive circuit is larger than the reference current, the current acquisition feedback loop switches the starting switch tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output current of the RCC constant current drive circuit is reduced.
In a preferred embodiment: the OVP feedback loop comprises a comparator A1, wherein the positive input end of the comparator A is connected with the reference voltage, and the negative input end of the comparator A is connected with the common end of resistors R2 and R6 connected in series; the resistors R2 and R6 are connected in parallel between the positive electrode output end and the negative electrode output end of the RCC constant current drive circuit; the output end of the comparator A1 is connected to the base electrode of the switching tube Q4, the emitter electrode of the switching tube Q4 is grounded, and the collector electrode is connected to the base electrode of the switching tube Q2; the emitter of the switch tube Q2 is grounded, and the collector is connected to the base of the starting switch tube Q1.
In a preferred embodiment: the current collection feedback loop comprises a comparator A2, wherein the input end of the positive electrode of the comparator A2 is connected with the reference current, and the negative electrode of the comparator A is used for collecting the output current of the RCC constant current driving circuit through a resistor LB 1; the output end of the comparator A2 is connected with the output end of the comparator A1.
In a preferred embodiment: the RCC constant current driving circuit comprises a mutual inductance coil, one input end of an input coil T1A of the mutual inductance coil is connected to the positive electrode output end of the rectifying and filtering circuit, and the other input end of the input coil T1A of the mutual inductance coil is connected to the collector electrode of the starting switch tube Q1; the base electrode of the starting switch tube is connected to the positive electrode output end of the rectifying and filtering circuit through a voltage reduction network; an auxiliary coil T1B, wherein one end of the auxiliary coil is connected to the step-down network through an oscillating capacitor C5; the other end of the oscillating capacitor is connected to the base electrode of the starting switch tube Q1.
In a preferred embodiment: the two output ends of the output coil T1C of the mutual inductance coil are respectively an anode output end and a cathode output end of the RCC constant current drive circuit.
In a preferred embodiment: the rectifying and filtering circuit comprises a bridge rectifying circuit, a first voltage source and a second voltage source, wherein the bridge rectifying circuit is provided with an input end connected with alternating current and a direct current end with an anode and a cathode; and a filter capacitor C2 connected between the positive and negative DC terminals.
In a preferred embodiment: the positive electrode and the negative electrode are connected in series, and the positive electrode and the negative electrode are connected in series through a capacitor C3 and a resistor R3.
In a preferred embodiment: the step-down network is a resistor R4, R5, R7 connected in series.
In a preferred embodiment: the negative output end of the output coil T1C is connected with the resistor LB1 in series.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the LED dimming driving circuit provided by the invention, the OVP voltage is directly collected from the output end of the RCC constant current driving circuit and fed back to the proportional operational amplifier, so that the output voltage with load and the no-load voltage difference can be made closer, the electric stress of an output device is greatly reduced, and the no-load power consumption can be made very small;
2. according to the LED dimming driving circuit provided by the invention, the output current is transmitted to the negative feedback operational amplifier after being sampled, and the output current can be controlled with high precision through the adjustment of the switching tube Q4, so that the problem that the corresponding output power is increased due to the increase of the input voltage of the traditional RCC circuit is solved without being influenced by the input voltage;
3. after comparators A1 and A2 are added to the output end, the voltage and the current can be constantly output, and the linear adjustment rate can be within 3%; compared with the common dimming IC, the LED dimming IC has lower cost and can be widely popularized and used in LED illumination.
Drawings
Fig. 1 is a circuit diagram of a preferred embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
Referring to fig. 1, an LED dimming driving circuit is characterized by comprising: the device comprises an RCC constant current driving circuit, an OVP feedback loop and a current acquisition feedback loop;
When the output is idle, the current collection feedback loop does not work, and the OVP feedback loop compares the output voltage of the RCC constant current drive circuit with a reference voltage; when the output voltage of the RCC constant current drive circuit is larger than the reference voltage, the OVP feedback loop switches a starting switch tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output voltage of the RCC constant current drive circuit is reduced;
When the output is connected with a load in an idle state, the output voltage of the RCC constant current driving circuit is always smaller than the reference voltage of the OVP, the OVP feedback loop does not work, and the current collection feedback loop collects the output current of the RCC constant current driving circuit and compares the output current with a reference current; when the output current of the RCC constant current drive circuit is larger than the reference current, the current acquisition feedback loop switches the starting switch tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output current of the RCC constant current drive circuit is reduced.
The specific circuit structure is as follows: the OVP feedback loop comprises a comparator A1, wherein the positive input end of the comparator A is connected with the reference voltage, and the negative input end of the comparator A is connected with the common end of resistors R2 and R6 connected in series; the resistors R2 and R6 are connected in parallel between the positive electrode output end and the negative electrode output end of the RCC constant current drive circuit; the output end of the comparator A1 is connected to the base electrode of the switching tube Q4, the emitter electrode of the switching tube Q4 is grounded, and the collector electrode is connected to the base electrode of the switching tube Q2; the emitter of the switch tube Q2 is grounded, and the collector is connected to the base of the starting switch tube Q1.
The current collection feedback loop comprises a comparator A2, wherein the input end of the positive electrode of the comparator A2 is connected with the reference current, and the negative electrode of the comparator A is used for collecting the output current of the RCC constant current driving circuit through a resistor LB 1; the output end of the comparator A2 is connected with the output end of the comparator A1.
The RCC constant current driving circuit comprises a mutual inductance coil, one input end of an input coil T1A of the mutual inductance coil is connected to the positive electrode output end of the rectifying and filtering circuit, and the other input end of the input coil T1A of the mutual inductance coil is connected to the collector electrode of the starting switch tube Q1; the base electrode of the starting switch tube is connected to the positive electrode output end of the rectifying and filtering circuit through a voltage reducing network, and the voltage reducing network is formed by serially connected resistors R4, R5 and R7. An auxiliary coil T1B, wherein one end of the auxiliary coil is connected to the step-down network through an oscillating capacitor C5; the other end of the oscillating capacitor is connected to the base electrode of the starting switch tube Q1.
The two output ends of the output coil T1C of the mutual inductance coil are respectively an anode output end and a cathode output end of the RCC constant current drive circuit. The negative output end of the output coil T1C is connected with the resistor LB1 in series.
The rectifying and filtering circuit comprises a bridge rectifying circuit, a first voltage source and a second voltage source, wherein the bridge rectifying circuit is provided with an input end connected with alternating current and a direct current end with an anode and a cathode; and a filter capacitor C2 connected between the positive and negative DC terminals.
The positive electrode direct current end is connected with the negative electrode direct current end, and the positive electrode direct current end is connected with the capacitor C3 through the resistor R3; the effect is that when the dimmer is turned to low end, it provides larger current maintenance for the controllable silicon, so that it keeps on state, so as to solve the problem of low end stroboscopic caused by small load current.
The working process is as follows: the filter circuit filters electromagnetic interference signals of an alternating current power grid and sends the electromagnetic interference signals to the bridge rectifier circuit, alternating current voltage is changed into pulsating direct current voltage, the pulsating direct current voltage is filtered by the filter capacitor C2 and then is sent to the starting circuit, and after the capacitor C5 is charged, the starting switch tube Q1 is started. The voltage induced by the auxiliary coil T1B keeps the starting switch tube Q1 to be further conducted and rapidly enters saturated conduction; along with the reduction of the current change rate of the auxiliary coil T1B, the driving capability of the base electrode of the starting switch tube Q1 is reduced, the starting switch tube Q1 is forced to enter the amplifying region from saturated conduction, and when the driving capability of the base electrode of the starting switch tube Q1 is further reduced, the starting switch tube Q1 can quickly enter the cut-off region to be cut off.
When the energy on the output coil T1C is released through the LED load, the starting circuit charges C5 again so that the starting switch tube Q1 is conducted for the second time. Thus, the periodic cycle realizes the work of the line switch.
After that, when the output is empty, the output current is zero, and the comparator A2 cannot collect the output current of the RCC constant current drive circuit and does not work; because no load light-emitting diode is clamped, the output voltage of the RCC constant current drive circuit linearly rises, when the output voltage reaches a set value (R2+R6) xVO/R2> V_ref, the comparator A1 outputs a low level, the switching tube Q4 is turned off, the switching tube Q2 is conducted to draw the base current of the starting switching tube Q1, the starting switching tube Q1 is turned off to cause the main loop to be turned off, and the output voltage of the RCC cross current drive circuit is reduced; when { (r2+r6) }/r2< v_ref, the comparator A1 outputs a high level driving switching transistor Q4 on, switching transistor Q2 base voltage is pulled low and turned off, switching transistor Q1 on, thereby periodically alternating to constant no-load voltage OVP.
When the output is connected with a load, the comparator A1 does not work because the output voltage is lower than the OVP voltage, the comparator A2 collects the output current of the RCC constant current driving circuit through the resistor LB1, when the output current of the RCC constant current driving circuit is V_SENSE V_ref/{ (V_SENSE+V_ref) RS1, the comparator A2 outputs a low level, the switching tube Q4 is cut off, the switching tube Q2 is conducted to draw the base current of the starting switching tube Q1, the starting switching tube Q1 is cut off, the main loop is cut off, the output current is reduced, and the effect of constant output current is achieved.
The foregoing is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art will be able to make insubstantial modifications of the present invention within the scope of the present invention disclosed herein by this concept, which falls within the actions of invading the protection scope of the present invention.
Claims (3)
1. An LED dimming driving circuit, characterized by comprising: the device comprises an RCC constant current driving circuit, an OVP feedback loop and a current acquisition feedback loop;
When the output is idle, the current collection feedback loop does not work, and the OVP feedback loop compares the output voltage of the RCC constant current drive circuit with a reference voltage; when the output voltage of the RCC constant current drive circuit is larger than the reference voltage, the OVP feedback loop switches a starting switch tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output voltage of the RCC constant current drive circuit is reduced;
When the output is connected with a load in an idle state, the output voltage of the RCC constant current driving circuit is always smaller than the reference voltage of the OVP, the OVP feedback loop does not work, and the current collection feedback loop collects the output current of the RCC constant current driving circuit and compares the output current with a reference current; when the output current of the RCC constant current drive circuit is larger than the reference current, the current acquisition feedback loop switches a starting switching tube Q1 in the RCC constant current drive circuit from an on state to an off state, so that the output current of the RCC constant current drive circuit is reduced; the OVP feedback loop comprises a comparator A1, wherein the positive input end of the comparator A is connected with the reference voltage, and the negative input end of the comparator A is connected with the common end of resistors R2 and R6 connected in series; the resistors R2 and R6 are connected in parallel between the positive electrode output end and the negative electrode output end of the RCC constant current drive circuit; the output end of the comparator A1 is connected to the base electrode of the switching tube Q4, the emitter electrode of the switching tube Q4 is grounded, and the collector electrode is connected to the base electrode of the switching tube Q2; the emitter of the switch tube Q2 is grounded, and the collector is connected to the base electrode of the starting switch tube Q1; the current collection feedback loop comprises a comparator A2, wherein the input end of the positive electrode of the comparator A2 is connected with the reference current, and the negative electrode of the comparator A is used for collecting the output current of the RCC constant current driving circuit through a resistor LB 1; the output end of the comparator A2 is connected with the output end of the comparator A1; the RCC constant current driving circuit comprises a mutual inductance coil, one input end of an input coil T1A of the mutual inductance coil is connected to the positive electrode output end of the rectifying and filtering circuit, and the other input end of the input coil T1A of the mutual inductance coil is connected to the collector electrode of the starting switch tube Q1; the base electrode of the starting switch tube is connected to the positive electrode output end of the rectifying and filtering circuit through a voltage reduction network; an auxiliary coil T1B, wherein one end of the auxiliary coil is connected to the step-down network through an oscillating capacitor C5; the other end of the oscillating capacitor is connected to the base electrode of the starting switch tube Q1; two output ends of an output coil T1C of the mutual inductance coil are respectively an anode output end and a cathode output end of the RCC constant current drive circuit;
The voltage reduction network is formed by serially connected resistors R4, R5 and R7; the negative output end of the output coil T1C is connected with the resistor LB1 in series.
2. The LED dimming driving circuit according to claim 1, wherein: the rectifying and filtering circuit comprises a bridge rectifying circuit, a first voltage source and a second voltage source, wherein the bridge rectifying circuit is provided with an input end connected with alternating current and a direct current end with an anode and a cathode; and a filter capacitor C2 connected between the positive and negative DC terminals.
3. The LED dimming driving circuit according to claim 2, wherein: the positive electrode and the negative electrode are connected in series, and the positive electrode and the negative electrode are connected in series through a capacitor C3 and a resistor R3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611216993.1A CN108243529B (en) | 2016-12-26 | 2016-12-26 | LED dimming driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611216993.1A CN108243529B (en) | 2016-12-26 | 2016-12-26 | LED dimming driving circuit |
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| CN108243529A CN108243529A (en) | 2018-07-03 |
| CN108243529B true CN108243529B (en) | 2024-05-03 |
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| TWI711338B (en) * | 2019-08-20 | 2020-11-21 | 宏碁股份有限公司 | Driving device |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4255782A (en) * | 1977-11-15 | 1981-03-10 | Jgf, Incorporated | Electrical energy conversion systems |
| US6081075A (en) * | 1999-05-13 | 2000-06-27 | Toko, Inc. | DC to AC switching circuit for driving an electroluminescent lamp exhibiting capactive loading characteristics |
| DE19930174A1 (en) * | 1999-06-30 | 2001-01-04 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Control circuit for LED and associated operating method |
| WO2004057924A1 (en) * | 2002-12-19 | 2004-07-08 | Koninklijke Philips Electronics N.V. | Leds driver |
| CN1622438A (en) * | 2003-11-25 | 2005-06-01 | 夏普株式会社 | Power supply circuit |
| CN102195496A (en) * | 2010-02-09 | 2011-09-21 | 电力集成公司 | Phase angle measurement of a dimming circuit for a switching power supply |
| CN102196618A (en) * | 2010-03-16 | 2011-09-21 | 成都芯源系统有限公司 | LED illumination driving circuit and method |
| CN102625514A (en) * | 2011-01-26 | 2012-08-01 | 聚积科技股份有限公司 | Adaptive bleeder circuit |
| CN103108433A (en) * | 2011-11-14 | 2013-05-15 | 台达电子企业管理（上海）有限公司 | Voltage adjusting circuit and light emitting diode (LED) drive device thereof |
| CN103262398A (en) * | 2010-11-04 | 2013-08-21 | 塞瑞斯逻辑公司 | Controlled power dissipation in a link path in a lighting system |
| CN203467008U (en) * | 2013-07-15 | 2014-03-05 | 邓金和 | RCC non-isolated constant current drive circuit for LEDs |
| CN103716946A (en) * | 2012-09-29 | 2014-04-09 | 深圳市海洋王照明工程有限公司 | LED constant-current drive circuit |
| CN104105244A (en) * | 2013-04-11 | 2014-10-15 | 海洋王（东莞）照明科技有限公司 | LED drive circuit |
| TWI556682B (en) * | 2015-05-01 | 2016-11-01 | 遠翔科技股份有限公司 | Driver circuit for switching switch according to capacitor voltage |
| CN206559675U (en) * | 2016-12-26 | 2017-10-13 | 厦门通士达照明有限公司 | A kind of LED dimming driving circuits |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003043994A (en) * | 2001-07-27 | 2003-02-14 | Canon Inc | Active matrix type display |
-
2016
- 2016-12-26 CN CN201611216993.1A patent/CN108243529B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4255782A (en) * | 1977-11-15 | 1981-03-10 | Jgf, Incorporated | Electrical energy conversion systems |
| US6081075A (en) * | 1999-05-13 | 2000-06-27 | Toko, Inc. | DC to AC switching circuit for driving an electroluminescent lamp exhibiting capactive loading characteristics |
| DE19930174A1 (en) * | 1999-06-30 | 2001-01-04 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Control circuit for LED and associated operating method |
| WO2004057924A1 (en) * | 2002-12-19 | 2004-07-08 | Koninklijke Philips Electronics N.V. | Leds driver |
| CN1622438A (en) * | 2003-11-25 | 2005-06-01 | 夏普株式会社 | Power supply circuit |
| CN102195496A (en) * | 2010-02-09 | 2011-09-21 | 电力集成公司 | Phase angle measurement of a dimming circuit for a switching power supply |
| CN102196618A (en) * | 2010-03-16 | 2011-09-21 | 成都芯源系统有限公司 | LED illumination driving circuit and method |
| CN103262398A (en) * | 2010-11-04 | 2013-08-21 | 塞瑞斯逻辑公司 | Controlled power dissipation in a link path in a lighting system |
| CN102625514A (en) * | 2011-01-26 | 2012-08-01 | 聚积科技股份有限公司 | Adaptive bleeder circuit |
| CN103108433A (en) * | 2011-11-14 | 2013-05-15 | 台达电子企业管理（上海）有限公司 | Voltage adjusting circuit and light emitting diode (LED) drive device thereof |
| CN103716946A (en) * | 2012-09-29 | 2014-04-09 | 深圳市海洋王照明工程有限公司 | LED constant-current drive circuit |
| CN104105244A (en) * | 2013-04-11 | 2014-10-15 | 海洋王（东莞）照明科技有限公司 | LED drive circuit |
| CN203467008U (en) * | 2013-07-15 | 2014-03-05 | 邓金和 | RCC non-isolated constant current drive circuit for LEDs |
| TWI556682B (en) * | 2015-05-01 | 2016-11-01 | 遠翔科技股份有限公司 | Driver circuit for switching switch according to capacitor voltage |
| CN206559675U (en) * | 2016-12-26 | 2017-10-13 | 厦门通士达照明有限公司 | A kind of LED dimming driving circuits |
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| CN108243529A (en) | 2018-07-03 |
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