CN102858048A - LED driving circuit and LED lamp - Google Patents
LED driving circuit and LED lamp Download PDFInfo
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- CN102858048A CN102858048A CN201110181020XA CN201110181020A CN102858048A CN 102858048 A CN102858048 A CN 102858048A CN 201110181020X A CN201110181020X A CN 201110181020XA CN 201110181020 A CN201110181020 A CN 201110181020A CN 102858048 A CN102858048 A CN 102858048A
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Abstract
The invention is suitable for the field of electronic lighting and provides an LED driving circuit and an LED lamp. In an embodiment of the invention, the LED driving circuit comprises an overcurrent protection sampling circuit comprising a current sampling resistor R1 and a switch tube, when an output return circuit of the LED driving circuit is in overcurrent, voltage on the current sampling resistor R1 is increased to enable voltage on a control end and a low-potential end of the switching tube to reach 0.7V, the switching tube is connected, voltage of a high-potential end of the switching tube is dragged down, and then the overcurrent protection sampling circuit starts to operate to transmit low level of the high-potential end of the switching tube to an input end of a detection circuit, so that overcurrent protection sampling is realized to enable the overcurrent protection circuit to perform overcurrent protection to the LED lamp.
Description
Technical field
The invention belongs to the electrical lighting field, relate in particular to a kind of led drive circuit and LED light fixture.
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.
But the protective circuit of existing led drive circuit is not too perfect, such as, do not design special overcurrent protection sample circuit, the overcurrent of LED light fixture is sampled, for current foldback circuit the LED light fixture is carried out overcurrent protection.Therefore, existing LED light fixture can't be worked reliably.
Summary of the invention
The object of the present invention is to provide a kind of led drive circuit, be intended to solve for want of overcurrent protection of existing LED light fixture sampling, and problem that can't reliably working.
The embodiment of the invention is achieved in that a kind of led drive circuit, is connected with testing circuit with the LED lamp body respectively, and described led drive circuit comprises:
Switch transformed circuit, transformer T1, rectifier diode D1, filter inductance L1, storage capacitor C1 and filter capacitor C2;
Described led drive circuit also comprises the overcurrent protection sample circuit that is made of current sampling resistor R1 and switching tube;
Two input termination AC power of described switch transformed circuit, the two ends of the armature winding of two output termination transformer T1 of described switch transformed circuit, the anode of one termination rectifier diode D1 of the secondary winding of described transformer T1, the negative electrode of described rectifier diode D1 connects the first end of filter inductance L1, the positive pole of the second termination LED lamp body of described filter inductance L1, the positive pole of described storage capacitor C1 connects the negative electrode of rectifier diode D1, the minus earth of described storage capacitor C1, described filter capacitor C2 is connected between the first end of the second end of filter inductance L1 and current sampling resistor R1, the negative pole of the first termination LED lamp body of described current sampling resistor R1, the second end ground connection of described current sampling resistor R1, the first end of the control termination current sampling resistor R1 of described switching tube, the in addition two ends of described switching tube are connected between described testing circuit and the ground.
Another purpose of the embodiment of the invention is to provide a kind of LED light fixture, comprises LED lamp body and testing circuit, and described LED light fixture also comprises led drive circuit, and described led drive circuit comprises:
Switch transformed circuit, transformer T1, rectifier diode D1, filter inductance L1, storage capacitor C1 and filter capacitor C2;
Described led drive circuit also comprises the overcurrent protection sample circuit that is made of current sampling resistor R1 and switching tube;
Two input termination AC power of described switch transformed circuit, the two ends of the armature winding of two output termination transformer T1 of described switch transformed circuit, the anode of one termination rectifier diode D1 of the secondary winding of described transformer T1, the negative electrode of described rectifier diode D1 connects the first end of filter inductance L1, the positive pole of the second termination LED lamp body of described filter inductance L1, the positive pole of described storage capacitor C1 connects the negative electrode of rectifier diode D1, the minus earth of described storage capacitor C1, described filter capacitor C2 is connected between the first end of the second end of filter inductance L1 and current sampling resistor R1, the negative pole of the first termination LED lamp body of described current sampling resistor R1, the second end ground connection of described current sampling resistor R1, the first end of the control termination current sampling resistor R1 of described switching tube, the in addition two ends of described switching tube are connected between described testing circuit and the ground.
In embodiments of the present invention; led drive circuit comprises the overcurrent protection sample circuit that is made of current sampling resistor R1 and switching tube; when the output loop overcurrent of led drive circuit; voltage on the current sampling resistor R1 increases; so that the control end of switching tube and the voltage on the cold end reach 0.7V; the switching tube conducting; dragged down the voltage of the hot end of switching tube; at this moment the overcurrent protection sample circuit begins action; the low level of the hot end of switching tube is delivered to the input of testing circuit; realize the effect of overcurrent protection sampling, for current foldback circuit the LED light fixture is carried out overcurrent protection.
Description of drawings
The circuit structure diagram of the led drive circuit that Fig. 1 provides for first embodiment of the invention;
The circuit structure diagram of the led drive circuit that Fig. 2 provides for 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 drive 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.
Switch transformed circuit 101, transformer T1, rectifier diode D1, filter inductance L1, storage capacitor C1 and filter capacitor C2;
Two input termination AC power of switch transformed circuit 101, the two ends of the armature winding of two output termination transformer T1 of switch transformed circuit 101, the anode of one termination rectifier diode D1 of the secondary winding of transformer T1, the negative electrode of rectifier diode D1 connects the first end of filter inductance L1, the positive pole of the second termination LED lamp body 200 of filter inductance L1, the positive pole of storage capacitor C1 connects the negative electrode of rectifier diode D1, the minus earth of storage capacitor C1, filter capacitor C2 is connected between the first end of the second end of filter inductance L1 and current sampling resistor R1, the negative pole of the first termination LED lamp body 200 of current sampling resistor R1, the second end ground connection of current sampling resistor R1, the first end of the control termination current sampling resistor R1 of switching tube 1021, the in addition two ends of switching tube 1021 are connected between testing circuit 300 and the ground.
As one embodiment of the invention, switching tube 1021 adopts triode Q1, and the base stage of triode Q1 is the control end of switching tube 1021, and the collector electrode of triode Q1 connects testing circuit 300, the grounded emitter of triode Q1.
Fig. 2 shows the circuit structure of the led drive 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 1021 adopts N-type metal-oxide-semiconductor Q2, and the grid of N-type metal-oxide-semiconductor Q2 is the control end of switching tube 1021, and the drain electrode of N-type metal-oxide-semiconductor Q2 connects testing circuit 300, the source ground of N-type metal-oxide-semiconductor Q2.
A kind of LED light fixture that the embodiment of the invention also provides comprises LED lamp body 200 and testing circuit 300, and the LED light fixture also comprises led drive circuit 100, and led drive circuit 100 comprises:
Switch transformed circuit 101, transformer T1, rectifier diode D1, filter inductance L1, storage capacitor C1 and filter capacitor C2;
Two input termination AC power of switch transformed circuit 101, the two ends of the armature winding of two output termination transformer T1 of switch transformed circuit 101, the anode of one termination rectifier diode D1 of the secondary winding of transformer T1, the negative electrode of rectifier diode D1 connects the first end of filter inductance L1, the positive pole of the second termination LED lamp body 200 of filter inductance L1, the positive pole of storage capacitor C1 connects the negative electrode of rectifier diode D1, the minus earth of storage capacitor C1, filter capacitor C2 is connected between the first end of the second end of filter inductance L1 and current sampling resistor R1, the negative pole of the first termination LED lamp body 200 of current sampling resistor R1, the second end ground connection of current sampling resistor R1, the first end of the control termination current sampling resistor R1 of switching tube 1021, the in addition two ends of switching tube 1021 are connected between testing circuit 300 and the ground.
As one embodiment of the invention, switching tube 1021 adopts triode Q1, and the base stage of triode Q1 is the control end of switching tube 1021, and the collector electrode of triode Q1 connects testing circuit 300, the grounded emitter of triode Q1.
As one embodiment of the invention, switching tube 1021 adopts N-type metal-oxide-semiconductor Q2, and the grid of N-type metal-oxide-semiconductor Q2 is the control end of switching tube 1021, and the drain electrode of N-type metal-oxide-semiconductor Q2 connects testing circuit 300, the source ground of N-type metal-oxide-semiconductor Q2.
In embodiments of the present invention; led drive circuit comprises the overcurrent protection sample circuit that is made of current sampling resistor R1 and switching tube; when the output loop overcurrent of led drive circuit; voltage on the current sampling resistor R1 increases; so that the control end of switching tube and the voltage on the cold end reach 0.7V; the switching tube conducting; dragged down the voltage of the hot end of switching tube; at this moment the overcurrent protection sample circuit begins action; the low level of the hot end of switching tube is delivered to the input of testing circuit; realize the effect of overcurrent protection sampling, for current foldback circuit the LED light fixture is carried out overcurrent protection.
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 (6)
1. a led drive circuit is connected with testing circuit with the LED lamp body respectively, it is characterized in that, described led drive circuit comprises:
Switch transformed circuit, transformer T1, rectifier diode D1, filter inductance L1, storage capacitor C1 and filter capacitor C2;
Described led drive circuit also comprises the overcurrent protection sample circuit that is made of current sampling resistor R1 and switching tube;
Two input termination AC power of described switch transformed circuit, the two ends of the armature winding of two output termination transformer T1 of described switch transformed circuit, the anode of one termination rectifier diode D1 of the secondary winding of described transformer T1, the negative electrode of described rectifier diode D1 connects the first end of filter inductance L1, the positive pole of the second termination LED lamp body of described filter inductance L1, the positive pole of described storage capacitor C1 connects the negative electrode of rectifier diode D1, the minus earth of described storage capacitor C1, described filter capacitor C2 is connected between the first end of the second end of filter inductance L1 and current sampling resistor R1, the negative pole of the first termination LED lamp body of described current sampling resistor R1, the second end ground connection of described current sampling resistor R1, the first end of the control termination current sampling resistor R1 of described switching tube, the in addition two ends of described switching tube are connected between described testing circuit and the ground.
2. led drive circuit as claimed in claim 1, it is characterized in that, described switching tube adopts triode Q1, and the base stage of described triode Q1 is the control end of switching tube, the collector electrode of described triode Q1 connects described testing circuit, the grounded emitter of described triode Q1.
3. led drive circuit as claimed in claim 1, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q2, and the grid of described N-type metal-oxide-semiconductor Q2 is the control end of switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q2 connects described testing circuit, the source ground of described N-type metal-oxide-semiconductor Q2.
4. a LED light fixture comprises LED lamp body and testing circuit, it is characterized in that, described LED light fixture also comprises led drive circuit, and described led drive circuit comprises:
Switch transformed circuit, transformer T1, rectifier diode D1, filter inductance L1, storage capacitor C1 and filter capacitor C2;
Described led drive circuit also comprises the overcurrent protection sample circuit that is made of current sampling resistor R1 and switching tube;
Two input termination AC power of described switch transformed circuit, the two ends of the armature winding of two output termination transformer T1 of described switch transformed circuit, the anode of one termination rectifier diode D1 of the secondary winding of described transformer T1, the negative electrode of described rectifier diode D1 connects the first end of filter inductance L1, the positive pole of the second termination LED lamp body of described filter inductance L1, the positive pole of described storage capacitor C1 connects the negative electrode of rectifier diode D1, the minus earth of described storage capacitor C1, described filter capacitor C2 is connected between the first end of the second end of filter inductance L1 and current sampling resistor R1, the negative pole of the first termination LED lamp body of described current sampling resistor R1, the second end ground connection of described current sampling resistor R1, the first end of the control termination current sampling resistor R1 of described switching tube, the in addition two ends of described switching tube are connected between described testing circuit and the ground.
5. LED light fixture as claimed in claim 4 is characterized in that, described switching tube adopts triode Q1, and the base stage of described triode Q1 is the control end of switching tube, and the collector electrode of described triode Q1 connects described testing circuit, the grounded emitter of described triode Q1.
6. LED light fixture as claimed in claim 4, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q2, and the grid of described N-type metal-oxide-semiconductor Q2 is the control end of switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q2 connects described testing circuit, the source ground of described N-type metal-oxide-semiconductor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110181020XA CN102858048A (en) | 2011-06-30 | 2011-06-30 | LED driving circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110181020XA CN102858048A (en) | 2011-06-30 | 2011-06-30 | LED driving circuit and LED lamp |
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| CN102858048A true CN102858048A (en) | 2013-01-02 |
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| CN201110181020XA Pending CN102858048A (en) | 2011-06-30 | 2011-06-30 | LED driving circuit and LED lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016041121A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Led drive power supply |
| CN105974993A (en) * | 2016-06-30 | 2016-09-28 | 南京国电南自美卓控制系统有限公司 | Overcurrent protection circuit and method for digital input circuit |
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| CN101969722A (en) * | 2010-09-27 | 2011-02-09 | 海洋王照明科技股份有限公司 | LED drive circuit and LED lamp |
| CN201846423U (en) * | 2010-10-26 | 2011-05-25 | 康佳集团股份有限公司 | LED backlight television and power source used for same |
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- 2011-06-30 CN CN201110181020XA patent/CN102858048A/en active Pending
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| CN1352482A (en) * | 2000-11-09 | 2002-06-05 | 台达电子工业股份有限公司 | DC/DC converting method and its converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016041121A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Led drive power supply |
| CN105974993A (en) * | 2016-06-30 | 2016-09-28 | 南京国电南自美卓控制系统有限公司 | Overcurrent protection circuit and method for digital input circuit |
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Application publication date: 20130102 |