CN103068096A - Light-emitting diode (LED) lamp, current sampling circuit and drive circuit of LED lamp - Google Patents
Light-emitting diode (LED) lamp, current sampling circuit and drive circuit of LED lamp Download PDFInfo
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- CN103068096A CN103068096A CN2011103236953A CN201110323695A CN103068096A CN 103068096 A CN103068096 A CN 103068096A CN 2011103236953 A CN2011103236953 A CN 2011103236953A CN 201110323695 A CN201110323695 A CN 201110323695A CN 103068096 A CN103068096 A CN 103068096A
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Abstract
The invention belongs to the field of light-emitting diode (LED) lamp circuits, and particularly relates to an LED lamp, a current sampling circuit and a drive circuit of the LED lamp. The LED lamp current sampling circuit collects current flowing through the LED lamp, a boosted circuit of the lamp adjusts the current flowing through the LED lamp according to the feedback of the current sampling circuit, and accordingly the LED lamp works in a constant current state. Compared with the prior art, the LED lamp current sampling circuit is simple in structure and low in cost.
Description
Technical field
The invention belongs to LED lamp circuit field, relate in particular to a kind of LED light fixture and current sampling circuit and drive circuit.
Background technology
At present, LED is as a kind of new type light source, has energy-saving and environmental protection, the characteristics that efficient, the life-span is long, has been used as lighting source and has been widely used in every field.
The light fixture that drives of a lot of LED in the market, because of energy-efficient, long extensive use of life-span, for so that the LED lamp can constant current work, adopt now the current sampling circuit acquisition stream to cross the electric current of LED lamp, the booster circuit of light fixture flows through the electric current of LED lamp according to the feedback adjusting of current sampling circuit, so that the LED lamp is operated in constant current state.
But existing LED lamp current sample circuit structure is all very complicated, and cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of LED lamp current sample circuit, be intended to solve present LED lamp current sample circuit and have complex structure, the problem that cost is high.
The present invention is achieved in that a kind of LED lamp current sample circuit, is connected to negative pole and the booster circuit of LED lamp group, and described LED lamp current sample circuit comprises:
Divider resistance R7, sample resistance R8, divider resistance R9, diode D1, move back even capacitor C 3 and operational amplifier U2A;
Described sample resistance R8 is connected between the negative pole and ground of described LED lamp group, the in-phase input end of described operational amplifier U2A connects the negative pole of described LED lamp group, described divider resistance R9 and divider resistance R7 are serially connected between the reference voltage source and ground that is provided by described booster circuit, the public connecting end of the described divider resistance R9 of the anti-phase input termination of described operational amplifier U2A and divider resistance R7, describedly move back even capacitor C 3 and be connected between the inverting input and output of described operational amplifier U2A, the anode of the described diode D1 of output termination of described operational amplifier U2A, the negative electrode of described diode D1 connects described booster circuit.
Another object of the present invention is to provide a kind of LED lamp driving circuit, the LED lamp current sample circuit that comprises the booster circuit that promotes input voltage, the electric current that flows through LED lamp group is sampled, described LED lamp current sample circuit is connected to negative pole and the booster circuit of LED lamp group, and described LED lamp current sample circuit comprises:
Divider resistance R7, sample resistance R8, divider resistance R9, diode D1, move back even capacitor C 3 and operational amplifier U2A;
Described sample resistance R8 is connected between the negative pole and ground of described LED lamp group, the in-phase input end of described operational amplifier U2A connects the negative pole of described LED lamp group, described divider resistance R9 and divider resistance R7 are serially connected between the reference voltage source and ground that is provided by described booster circuit, the public connecting end of the described divider resistance R9 of the anti-phase input termination of described operational amplifier U2A and divider resistance R7, describedly move back even capacitor C 3 and be connected between the inverting input and output of described operational amplifier U2A, the anode of the described diode D1 of output termination of described operational amplifier U2A, the negative electrode of described diode D1 connects described booster circuit.
Another object of the present invention is to provide a kind of LED light fixture, comprise LED lamp driving circuit and LED lamp group, the LED lamp current sample circuit that described LED lamp driving circuit comprises the booster circuit that promotes input voltage, the electric current that flows through LED lamp group is sampled, described LED lamp current sample circuit is connected to negative pole and the booster circuit of LED lamp group, and described LED lamp current sample circuit comprises:
Divider resistance R7, sample resistance R8, divider resistance R9, diode D1, move back even capacitor C 3 and operational amplifier U2A;
Described sample resistance R8 is connected between the negative pole and ground of described LED lamp group, the in-phase input end of described operational amplifier U2A connects the negative pole of described LED lamp group, described divider resistance R9 and divider resistance R7 are serially connected between the reference voltage source and ground that is provided by described booster circuit, the public connecting end of the described divider resistance R9 of the anti-phase input termination of described operational amplifier U2A and divider resistance R7, describedly move back even capacitor C 3 and be connected between the inverting input and output of described operational amplifier U2A, the anode of the described diode D1 of output termination of described operational amplifier U2A, the negative electrode of described diode D1 connects described booster circuit.
In the present invention, LED lamp current sample circuit acquisition stream provided by the invention is crossed the electric current of LED lamp, the booster circuit of light fixture flows through the electric current of LED lamp according to the feedback adjusting of current sampling circuit, so that the LED lamp is operated in constant current state, with respect to prior art, the LED lamp current sample circuit structure that the embodiment of the invention provides is simple, cost is low.
Description of drawings
Fig. 1 is the circuit structure diagram of the LED lamp driving circuit that provides of first embodiment of the invention;
Fig. 2 is the circuit structure diagram of the LED lamp driving circuit that provides of second embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the circuit structure of the LED lamp driving circuit that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
A kind of LED lamp driving circuit, the LED lamp current sample circuit 200 that comprises the booster circuit 100 that promotes input voltage, the electric current that flows through LED lamp group is sampled, LED lamp current sample circuit 200 is connected to negative pole and the booster circuit 100 of LED lamp group 300, and LED lamp current sample circuit 200 comprises:
Divider resistance R7, sample resistance R8, divider resistance R9, diode D1, move back even capacitor C 3 and operational amplifier U2A;
Sample resistance R8 is connected between the negative pole and ground of LED lamp group 300, the in-phase input end of operational amplifier U2A connects the negative pole of LED lamp group 300, divider resistance R9 and divider resistance R7 are serially connected between the reference voltage source and ground that is provided by booster circuit 100, the anti-phase input termination divider resistance R9 of operational amplifier U2A and the public connecting end of divider resistance R7, moving back even capacitor C 3 is connected between the inverting input and output of operational amplifier U2A, the anode of the output terminating diode D1 of operational amplifier U2A, the negative electrode of diode D1 connects booster circuit 100.
As one embodiment of the invention, booster circuit 100 comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, inductance L 1, diode D2, diode D3, capacitor C 1, capacitor C 2, electrochemical capacitor C4, switching tube 101 and boost control chip U1;
The first termination power of inductance L 1, the anode of the second terminating diode D2 of inductance L 1, the negative electrode of diode D2 connects the positive pole of LED lamp group 300, capacitor C 2 and electrochemical capacitor C4 are connected in parallel between the negative electrode and ground of diode D2, divider resistance R5 and divider resistance R6 are connected between the negative electrode and ground of diode D2, the input of switching tube 101, output is connected between the first end of the second end of inductance L 1 and divider resistance R3, the second end ground connection of divider resistance R3, the control output end DR of the control termination boost control chip U1 of switching tube 101, divider resistance R4 is connected between the control end and output of switching tube 101, the feedback receiving terminal FB of boost control chip U1 connects the negative electrode of diode D1, the power end VCC of boost control chip U1 connects power supply, the frequency adjustment end FA of boost control chip U1 is by divider resistance R2 ground connection, the power supply ground end PGND of boost control chip U1 and simulation ground end AGND be ground connection simultaneously, the common port COMP of boost control chip U1 is by divider resistance R1 and capacitor C 1 ground connection of series connection, the electric current induction end ISEN of boost control chip U1 connects the first end of divider resistance R3, the anode of diode D3 connects the public connecting end of divider resistance R5 and divider resistance R6, and the negative electrode of diode D3 meets the feedback receiving terminal FB of boost control chip U1.
As one embodiment of the invention, switching tube 101 adopts N-type metal-oxide-semiconductor Q1, and the grid of N-type metal-oxide-semiconductor Q1 is the control end of switching tube 101, and the drain electrode of N-type metal-oxide-semiconductor Q1 connects the second end of inductance L 1, and the source electrode of N-type metal-oxide-semiconductor Q1 connects the first end of divider resistance R3.
Fig. 2 shows the circuit structure of the LED lamp driving circuit that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
As one embodiment of the invention, switching tube 101 adopts NPN type triode Q2, the base stage of NPN type triode Q2 is the control end of switching tube 101, and the collector electrode of NPN type triode Q2 connects the second end of inductance L 1, and the emitter of NPN type triode Q2 connects the first end of divider resistance R3.
As one embodiment of the invention, boost control chip U1 adopts the LM3478 chip.
The embodiment of the invention also provides a kind of LED light fixture, comprises above-mentioned LED lamp driving circuit and LED lamp group 300.
The below adopts N-type metal-oxide-semiconductor Q1 as example take switching tube 101, and the operation principle of LED lamp driving circuit is described:
The output current Io of LED lamp group 300 arrives ground through sample resistance R8, produce a pressure drop at sample resistance R8, voltage V+=Io*R8 of the in-phase input end of operational amplifier U2A so, because the voltage of the feedback receiving terminal FB of boost control chip U1 is reference voltage 1.26V, voltage V-=1.26*R7/ (R7+R9) of the inverting input of operational amplifier U2A so, when electric current works, the voltage of in-phase input end and inverting input equates, the output output low level of operational amplifier U2A, constant-current circuit reaches balance; When the output current Io of LED lamp group 300 increases, pressure drop on the sample resistance R8 increases, be that in-phase input end voltage increases and greater than the anti-phase input terminal voltage, output voltage is sharply increased, the output output high level of operational amplifier U2A, make diode D1 conducting, signal is inputed to the feedback receiving terminal FB of boost control chip U1, the control output end DR output pulse signal of boost control chip U1, turn-on and turn-off by control N-type metal-oxide-semiconductor Q1, regulate booster circuit 100 and export to the electric current of LED lamp group 300, thereby realization constant current function, be specially: inductance L 1, diode D1, N-type metal-oxide-semiconductor Q1 and electrochemical capacitor C4 consist of a BOOST booster circuit, if N-type metal-oxide-semiconductor Q1 disconnects for a long time, the output voltage of booster circuit 100 equals input voltage; But when N-type metal-oxide-semiconductor Q1 conducting, the BOOST booster circuit is in charged state, input voltage flows through inductance L 1, along with inductive current increases, 1 li of inductance L has stored some electric weight, when N-type metal-oxide-semiconductor Q1 disconnects, the BOOST booster circuit is in discharge condition, inductance L 1 begins the charging to electrochemical capacitor C4, and electrochemical capacitor C4 both end voltage raises, and this moment, the output voltage of booster circuit 100 was higher than input voltage.Like this, by the turn-on and turn-off of control N-type metal-oxide-semiconductor Q1, just can regulate the electric current that booster circuit 100 is exported to LED lamp group 300.
In embodiments of the present invention, the LED lamp current sample circuit acquisition stream that the embodiment of the invention provides is crossed the electric current of LED lamp, the booster circuit of light fixture flows through the electric current of LED lamp according to the feedback adjusting of current sampling circuit, so that the LED lamp is operated in constant current state, with respect to prior art, the LED lamp current sample circuit structure that the embodiment of the invention provides is simple, cost is low.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. LED lamp current sample circuit is connected to negative pole and the booster circuit of LED lamp group, it is characterized in that, described LED lamp current sample circuit comprises:
Divider resistance R7, sample resistance R8, divider resistance R9, diode D1, move back even capacitor C 3 and operational amplifier U2A;
Described sample resistance R8 is connected between the negative pole and ground of described LED lamp group, the in-phase input end of described operational amplifier U2A connects the negative pole of described LED lamp group, described divider resistance R9 and divider resistance R7 are serially connected between the reference voltage source and ground that is provided by described booster circuit, the public connecting end of the described divider resistance R9 of the anti-phase input termination of described operational amplifier U2A and divider resistance R7, describedly move back even capacitor C 3 and be connected between the inverting input and output of described operational amplifier U2A, the anode of the described diode D1 of output termination of described operational amplifier U2A, the negative electrode of described diode D1 connects described booster circuit.
2. LED lamp driving circuit, the LED lamp current sample circuit that comprises the booster circuit that promotes input voltage, the electric current that flows through LED lamp group is sampled, described LED lamp current sample circuit is connected to negative pole and the booster circuit of LED lamp group, it is characterized in that, described LED lamp current sample circuit comprises:
Divider resistance R7, sample resistance R8, divider resistance R9, diode D1, move back even capacitor C 3 and operational amplifier U2A;
Described sample resistance R8 is connected between the negative pole and ground of described LED lamp group, the in-phase input end of described operational amplifier U2A connects the negative pole of described LED lamp group, described divider resistance R9 and divider resistance R7 are serially connected between the reference voltage source and ground that is provided by described booster circuit, the public connecting end of the described divider resistance R9 of the anti-phase input termination of described operational amplifier U2A and divider resistance R7, describedly move back even capacitor C 3 and be connected between the inverting input and output of described operational amplifier U2A, the anode of the described diode D1 of output termination of described operational amplifier U2A, the negative electrode of described diode D1 connects described booster circuit.
3. LED lamp driving circuit as claimed in claim 2 is characterized in that, described booster circuit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, inductance L 1, diode D2, diode D3, capacitor C 1, capacitor C 2, electrochemical capacitor C4, switching tube and boost control chip U1;
The first termination power of described inductance L 1, the anode of the described diode D2 of the second termination of described inductance L 1, the negative electrode of described diode D2 connects the positive pole of described LED lamp group, described capacitor C 2 and electrochemical capacitor C4 are connected in parallel between the negative electrode and ground of described diode D2, described divider resistance R5 and divider resistance R6 are connected between the negative electrode and ground of described diode D2, the input of described switching tube, output is connected between the first end of the second end of described inductance L 1 and described divider resistance R3, the second end ground connection of described divider resistance R3, the control output end of the described boost control chip U1 of control termination of described switching tube, described divider resistance R4 is connected between the control end and output of described switching tube, the feedback of described boost control chip U1 receives the negative electrode of the described diode D1 of termination, the power supply termination power of described boost control chip U1, the frequency adjustment end of described boost control chip U1 is by described divider resistance R2 ground connection, the power supply ground end of described boost control chip U1 and simulation ground end be ground connection simultaneously, the common port of described boost control chip U1 is by divider resistance R1 and capacitor C 1 ground connection of series connection, the first end of the described divider resistance R3 of electric current induction termination of described boost control chip U1, the anode of described diode D3 connects the public connecting end of described divider resistance R5 and divider resistance R6, and the negative electrode of described diode D3 connects the feedback receiving terminal of described boost control chip U1.
4. LED lamp driving circuit as claimed in claim 3, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q1, the grid of described N-type metal-oxide-semiconductor Q1 is the control end of switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q1 connects the second end of described inductance L 1, and the source electrode of described N-type metal-oxide-semiconductor Q1 connects the first end of described divider resistance R3.
5. LED lamp driving circuit as claimed in claim 3, it is characterized in that, described switching tube adopts NPN type triode Q2, the base stage of described NPN type triode Q2 is the control end of switching tube, the collector electrode of described NPN type triode Q2 connects the second end of described inductance L 1, and the emitter of described NPN type triode Q2 connects the first end of described divider resistance R3.
6. LED light fixture, comprise LED lamp driving circuit and LED lamp group, the LED lamp current sample circuit that described LED lamp driving circuit comprises the booster circuit that promotes input voltage, the electric current that flows through LED lamp group is sampled, described LED lamp current sample circuit is connected to negative pole and the booster circuit of LED lamp group, it is characterized in that, described LED lamp current sample circuit comprises:
Divider resistance R7, sample resistance R8, divider resistance R9, diode D1, move back even capacitor C 3 and operational amplifier U2A;
Described sample resistance R8 is connected between the negative pole and ground of described LED lamp group, the in-phase input end of described operational amplifier U2A connects the negative pole of described LED lamp group, described divider resistance R9 and divider resistance R7 are serially connected between the reference voltage source and ground that is provided by described booster circuit, the public connecting end of the described divider resistance R9 of the anti-phase input termination of described operational amplifier U2A and divider resistance R7, describedly move back even capacitor C 3 and be connected between the inverting input and output of described operational amplifier U2A, the anode of the described diode D1 of output termination of described operational amplifier U2A, the negative electrode of described diode D1 connects described booster circuit.
7. LED light fixture as claimed in claim 6 is characterized in that, described booster circuit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, inductance L 1, diode D2, diode D3, capacitor C 1, capacitor C 2, electrochemical capacitor C4, switching tube and boost control chip U1;
The first termination power of described inductance L 1, the anode of the described diode D2 of the second termination of described inductance L 1, the negative electrode of described diode D2 connects the positive pole of described LED lamp group, described capacitor C 2 and electrochemical capacitor C4 are connected in parallel between the negative electrode and ground of described diode D2, described divider resistance R5 and divider resistance R6 are connected between the negative electrode and ground of described diode D2, the input of described switching tube, output is connected between the first end of the second end of described inductance L 1 and described divider resistance R3, the second end ground connection of described divider resistance R3, the control output end of the described boost control chip U1 of control termination of described switching tube, described divider resistance R4 is connected between the control end and output of described switching tube, the feedback of described boost control chip U1 receives the negative electrode of the described diode D1 of termination, the power supply termination power of described boost control chip U1, the frequency adjustment end of described boost control chip U1 is by described divider resistance R2 ground connection, the power supply ground end of described boost control chip U1 and simulation ground end be ground connection simultaneously, the common port of described boost control chip U1 is by divider resistance R1 and capacitor C 1 ground connection of series connection, the first end of the described divider resistance R3 of electric current induction termination of described boost control chip U1, the anode of described diode D3 connects the public connecting end of described divider resistance R5 and divider resistance R6, and the negative electrode of described diode D3 connects the feedback receiving terminal of described boost control chip U1.
8. LED light fixture as claimed in claim 7, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q1, the grid of described N-type metal-oxide-semiconductor Q1 is the control end of switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q1 connects the second end of described inductance L 1, and the source electrode of described N-type metal-oxide-semiconductor Q1 connects the first end of described divider resistance R3.
9. LED light fixture as claimed in claim 7, it is characterized in that, described switching tube adopts NPN type triode Q2, the base stage of described NPN type triode Q2 is the control end of switching tube, the collector electrode of described NPN type triode Q2 connects the second end of described inductance L 1, and the emitter of described NPN type triode Q2 connects the first end of described divider resistance R3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103236953A CN103068096A (en) | 2011-10-21 | 2011-10-21 | Light-emitting diode (LED) lamp, current sampling circuit and drive circuit of LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103236953A CN103068096A (en) | 2011-10-21 | 2011-10-21 | Light-emitting diode (LED) lamp, current sampling circuit and drive circuit of LED lamp |
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| CN103916006A (en) * | 2014-04-08 | 2014-07-09 | 江苏银河电子股份有限公司 | Drive circuit of inductive device |
| CN104219812A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Constant current sampling circuit and lamp thereof |
| CN104410269A (en) * | 2014-12-24 | 2015-03-11 | 陆俊 | Direct-current power supply converting circuit and device |
| CN111373273A (en) * | 2017-12-29 | 2020-07-03 | 德州仪器公司 | Apparatus and method for processing a sensed current |
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| CN201509152U (en) * | 2009-09-18 | 2010-06-16 | 重庆希诺达通信有限公司 | Boosted circuit for input ultra-low voltage |
| CN201994045U (en) * | 2011-04-12 | 2011-09-28 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal television |
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| CN201467512U (en) * | 2009-06-05 | 2010-05-12 | 华润矽威科技（上海）有限公司 | Light emitting diode (LED) illumination driving device for vehicles and ships |
| CN201509152U (en) * | 2009-09-18 | 2010-06-16 | 重庆希诺达通信有限公司 | Boosted circuit for input ultra-low voltage |
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| CN104219812A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Constant current sampling circuit and lamp thereof |
| CN103916006A (en) * | 2014-04-08 | 2014-07-09 | 江苏银河电子股份有限公司 | Drive circuit of inductive device |
| CN104410269A (en) * | 2014-12-24 | 2015-03-11 | 陆俊 | Direct-current power supply converting circuit and device |
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Application publication date: 20130424 |