CN103338547B - High efficient and environmental friendly LED high-voltage linear constant current driving circuit - Google Patents
High efficient and environmental friendly LED high-voltage linear constant current driving circuit Download PDFInfo
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- CN103338547B CN103338547B CN201310094317.1A CN201310094317A CN103338547B CN 103338547 B CN103338547 B CN 103338547B CN 201310094317 A CN201310094317 A CN 201310094317A CN 103338547 B CN103338547 B CN 103338547B
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Abstract
The invention relates to a high efficient and environmental friendly LED high-voltage linear constant current driving circuit, which can solve the problem that a driving circuit in the prior art has high requirements for resources, bad for environmental protection and low in efficiency. Main points of the technical solution are that the high efficient and environmental friendly LED high-voltage linear constant driving circuit is connected to a power supply, provides power for a load and comprises a rectifier bridge circuit, a filtering circuit, a main control circuit, a reference voltage circuit, a constant current regulating circuit and an output control circuit, an input end of the rectifier bridge circuit is connected with the power supply, an output end of the rectifier bridge circuit is electrically connected with the reference voltage circuit through the filtering circuit, a reference output end of the reference voltage circuit is connected with a reference voltage input end of the main control circuit, a power end of the reference voltage circuit is connected with a power end of the main control circuit, a feedback end of the main control circuit is connected with a grounding end of the main control circuit through the constant current regulating circuit, and an output end of the main control circuit is connected with the load through the output control circuit. The LED high-voltage linear constant current driving circuit provided by the invention is high efficient and environmental friendly.
Description
Technical field
The present invention relates to a kind of power circuit, be specifically related to a kind of LED high-voltage linear constant current drive circuit of high-efficiency environment friendly.
Background technology
Linear constant current drive circuit, general alternating current circuit is converted to DC circuit, always be drive circuit conventional in present life and work, can be used for the DC equipment such as driving LED, but what present linear constant current drive circuit generally all adopted is that common IC chip drives, the size of current driven is controlled by IC chip, and the driver output of IC chip is limited in one's ability, the linear constant current drive current of high pressure cannot be exported, cause, now in order to obtain high-voltage linear constant current drive current, the mode that polylith IC chip can be adopted to superpose exports, like this, can cause again, too much application IC chip, higher to resource requirement, unfavorable to environmental protection, and, efficiency is not high yet, therefore the LED high-voltage linear constant current drive circuit producing and develop a kind of high-efficiency environment friendly is imperative.
Chinese patent notification number: CN202310207U, publication date on July 14th, 2012, disclose a kind of high-voltage linear constant current driver circuit for LED, it is characterized in that: the electric current being detected the emitter resistance of the Darlington transistor be made up of two high-voltage tubes by the low reference pin (R) of three ends voltage stabilizing didoe able to programme, utilize the negative electrode (K) of three ends voltage stabilizing didoe able to programme to the line impedance of anode (A) by reference pin (R) voltage-controlled characteristic, adjust the base current of the high-voltage three-pole pipe of driving LED, make the driving current constant of LED in set point.Owing to using the form of two high-voltage three-pole pipe group Darlington transistors, therefore the electric current of its base stage needs is very little, and the power consumed on inclined resistance is like this just very little, makes the efficiency of whole circuit very high.But still there is too much application IC chip in this technical scheme, higher to resource requirement, unfavorable to environmental protection, and, the problem that efficiency is not high yet.
Summary of the invention
The object of the invention is to solve in prior art and there is too much application IC chip, higher to resource requirement, unfavorable to environmental protection, and also the problem that efficiency is not high yet, provides a kind of LED high-voltage linear constant current drive circuit of high-efficiency environment friendly.
The technical solution adopted for the present invention to solve the technical problems is: a kind of LED high-voltage linear constant current drive circuit of high-efficiency environment friendly, connect power supply, load is powered, comprise rectifier circuit, filter circuit, governor circuit, reference voltage circuit, constant flow regulation circuit and output control circuit, described rectifier circuit input is connected with power supply, the output of rectifier circuit is electrically connected with reference voltage circuit by filter circuit, the reference output of reference voltage circuit is connected with the reference voltage input of described governor circuit, the power end of reference voltage circuit is connected with described governor circuit power end, the feedback end of described governor circuit is connected with the earth terminal of governor circuit by constant flow regulation circuit, the output of described governor circuit is connected with described load by output control circuit.When the present invention works, first rectification is carried out by rectifier bridge, filter circuit carries out filtering, output services voltage and reference voltage are to governor circuit, governor circuit exports and controls electric current to output control circuit, field effect transistor in output control circuit changes the on off state of self according to the electric current that governor circuit exports, load in the present invention is directly powered by rectifier circuit, simultaneously, load is also connected with field effect transistor, therefore, the on off state changing field effect transistor just directly can cross the size of the electric current of field effect transistor by control flow check, so control the switching value of field effect transistor, the effect that high-voltage linear constant current drives can be reached, simultaneously, the present invention is provided with constant flow regulation circuit as feedback, particularly variable-resistance setting, the present invention is made to strengthen by feedback the effect that the control of governor circuit to field effect transistor reaches high-efficiency environment friendly.
As preferably, described governor circuit comprises power supply circuits, logic control circuit, protective circuit, Drive and Control Circuit, compensate and start control circuit and field effect transistor Q1 and amplifier, the input of described power supply circuits is connected with the power end of described reference voltage circuit, logic control circuit, protective circuit, Drive and Control Circuit, compensate and start control circuit and power by power supply circuits, the input of described logic control circuit is connected with the reference output of described reference voltage circuit, the control end of described logic control circuit is connected with described protective circuit, the output of described logic control circuit is connected with the control end of described driving control device, the input of driving control device is connected with the output of described amplifier, the positive input terminal of amplifier and described compensation and start control circuit and be connected, the negative input end of amplifier is connected with described constant flow regulation circuit as the feedback end of governor circuit, the output of Drive and Control Circuit is connected with the grid of described field effect transistor Q1, the source electrode of described field effect transistor Q1 is connected with the negative input end of described amplifier, the drain electrode of described field effect transistor Q1 is connected with described load by output control circuit as the output of governor circuit.
As preferably, described field effect transistor Q1 is N channel field-effect pipe.
As preferably, described rectifier circuit comprises diode D1, diode D2, diode D3 and diode D4, described filter circuit comprises electric capacity C1, the anode of diode D1 is connected with described power supply, the anode of diode D1 is connected with the negative electrode of described diode D3, the anode of diode D2 is connected with described power supply, the negative electrode of diode D2 is connected with the negative electrode of described diode D1, the negative electrode of diode D2 is also connected with the positive pole of described electric capacity C1, the anode of diode D2 is connected with the negative electrode of diode D4, the anode of diode D4 is connected with the anode of described diode D3, the anode of diode D4 is connected with the negative pole of described electric capacity C1.
As preferably, described reference voltage circuit comprises resistance R1, resistance R2, resistance R3 and electric capacity C2, first conduction terminal of described resistance R1 is connected with the positive pole of electric capacity C1, second conduction terminal of resistance R1 is connected with first conduction terminal of first conduction terminal of resistance R2, electric capacity C2 and the power supply circuits of governor circuit, second conduction terminal of resistance R2 is connected with the reference voltage input of governor circuit, second conduction terminal of described resistance R2 is also connected with the earth terminal of governor circuit by resistance R3, and second conduction terminal of electric capacity C2 is connected with the earth terminal of governor circuit.
As preferably, described constant flow regulation circuit comprises power transformation resistance R5 and resistance R4, and first conduction terminal of described power transformation resistance R5 is connected with the feedback end of described governor circuit, and the power transformation end that described power transformation hinders R5 passes through resistance R4 and is connected with the earth terminal of governor circuit.
As preferably, described output control circuit comprises field effect transistor Q2, resistance R6 and resistance R7, first conduction terminal of described resistance R6 is connected with the output of described governor circuit, second conduction terminal of described resistance R6 is connected with the grid of described field effect transistor Q2, the power transformation end that source electrode and the described power transformation of described field effect transistor Q2 hinder R5 is connected, the source drain of described field effect transistor Q2 is connected with described load negative pole, the first end of described resistance R7 is connected with second end of described resistance R6, second end of described resistance R7 is connected with the output of described rectifier bridge, second end of described resistance R7 is also connected with the positive pole of described load.
As preferably, described field effect transistor Q2 is N channel field-effect pipe.
As preferably, described load is LED.
As preferably, described power supply circuits also include calculating voltage delivery outlet, and described calculating voltage delivery outlet is connected with the positive input terminal of described amplifier.
The invention has the beneficial effects as follows: when the present invention works, first rectification is carried out by rectifier bridge, filter circuit carries out filtering, output services voltage and reference voltage are to governor circuit, governor circuit exports and controls electric current to output control circuit, field effect transistor in output control circuit changes the on off state of self according to the electric current that governor circuit exports, load in the present invention is directly powered by rectifier circuit, simultaneously, load is also connected with field effect transistor, therefore, the on off state changing field effect transistor just directly can cross the size of the electric current of field effect transistor by control flow check, so control the switching value of field effect transistor, the effect that high-voltage linear constant current drives can be reached, simultaneously, the present invention is provided with constant flow regulation circuit as feedback, particularly variable-resistance setting, the present invention is made to strengthen by feedback the effect that the control of governor circuit to field effect transistor reaches high-efficiency environment friendly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of main power source of the present invention when powering;
Fig. 2 is a kind of circuit theory diagrams of governor circuit in the present invention.
In figure: 1, power supply circuits, 2, protective circuit, 3, logic control circuit, 4, compensate and start control circuit, 5, Drive and Control Circuit.
Embodiment
Below by specific embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
A kind of LED high-voltage linear constant current drive circuit (see accompanying drawing 1) of high-efficiency environment friendly, comprise rectifier circuit, filter circuit, governor circuit, reference voltage circuit, constant flow regulation circuit and output control circuit, described rectifier circuit input is connected with power supply, the output of rectifier circuit is electrically connected with reference voltage circuit by filter circuit, the reference output of reference voltage circuit is connected with the reference voltage input of described governor circuit, the power end of reference voltage circuit is connected with described governor circuit power end, the feedback end of described governor circuit is connected with the earth terminal of governor circuit by constant flow regulation circuit, the output of described governor circuit is connected with described load by output control circuit.Described governor circuit comprises power supply circuits 1, logic control circuit 3, protective circuit 2, Drive and Control Circuit 5, compensate and start control circuit 4 and field effect transistor Q1 and amplifier, the input of described power supply circuits is connected with the power end of described reference voltage circuit, logic control circuit, protective circuit, Drive and Control Circuit, compensate and start control circuit and power by power supply circuits, the input of described logic control circuit is connected with the reference output of described reference voltage circuit, the control end of described logic control circuit is connected with described protective circuit, the output of described logic control circuit is connected with the control end of described driving control device, the input of driving control device is connected with the output of described amplifier, the positive input terminal of amplifier and described compensation and start control circuit and be connected, the negative input end of amplifier is connected with described constant flow regulation circuit as the feedback end of governor circuit, the output of Drive and Control Circuit is connected with the grid of described field effect transistor Q1, the source electrode of described field effect transistor Q1 is connected with the negative input end of described amplifier, the drain electrode of described field effect transistor Q1 is connected with described load by output control circuit as the output of governor circuit.Described field effect transistor Q1 is N channel field-effect pipe.Described rectifier circuit comprises diode D1, diode D2, diode D3 and diode D4, described filter circuit comprises electric capacity C1, the anode of diode D1 is connected with described power supply, the anode of diode D1 is connected with the negative electrode of described diode D3, the anode of diode D2 is connected with described power supply, the negative electrode of diode D2 is connected with the negative electrode of described diode D1, the negative electrode of diode D2 is also connected with the positive pole of described electric capacity C1, the anode of diode D2 is connected with the negative electrode of diode D4, the anode of diode D4 is connected with the anode of described diode D3, the anode of diode D4 is connected with the negative pole of described electric capacity C1.Described reference voltage circuit comprises resistance R1, resistance R2, resistance R3 and electric capacity C2, first conduction terminal of described resistance R1 is connected with the positive pole of electric capacity C1, second conduction terminal of resistance R1 is connected with first conduction terminal of first conduction terminal of resistance R2, electric capacity C2 and the power supply circuits of governor circuit, second conduction terminal of resistance R2 is connected with the reference voltage input of governor circuit, second conduction terminal of described resistance R2 is also connected with the earth terminal of governor circuit by resistance R3, and second conduction terminal of electric capacity C2 is connected with the earth terminal of governor circuit.Described constant flow regulation circuit comprises power transformation resistance R5 and resistance R4, and first conduction terminal of described power transformation resistance R5 is connected with the feedback end of described governor circuit, and the power transformation end of described power transformation resistance R5 is connected with the earth terminal of governor circuit by resistance R4.Described output control circuit comprises field effect transistor Q2, resistance R6 and resistance R7, first conduction terminal of described resistance R6 is connected with the output of described governor circuit, second conduction terminal of described resistance R6 is connected with the grid of described field effect transistor Q2, the power transformation end that source electrode and the described power transformation of described field effect transistor Q2 hinder R5 is connected, the source drain of described field effect transistor Q2 is connected with described load negative pole, the first end of described resistance R7 is connected with second end of described resistance R6, second end of described resistance R7 is connected with the output of described rectifier bridge, second end of described resistance R7 is also connected with the positive pole of described load.Described field effect transistor Q2 is N channel field-effect pipe.Described power supply circuits also include calculating voltage delivery outlet, and described calculating voltage delivery outlet is connected with the positive input terminal of described amplifier.Described load is LED.
During the present embodiment work, first rectification is carried out by rectifier bridge, filter circuit carries out filtering, output services voltage and reference voltage are to governor circuit, governor circuit compensates, by accurate logic control through inner startup compensation, temperature compensation, export and control electric current to output control circuit, the field effect transistor in output control circuit changes the on off state of self according to the electric current that governor circuit exports, load input terminal in the present embodiment is directly powered by rectifier circuit, because load input terminal is directly powered by rectifier circuit, so can directly input high electric current by rectifier bridge, simultaneously, load is also connected with field effect transistor, therefore, the on off state changing field effect transistor just directly can cross the size of the electric current of field effect transistor by control flow check, so control the switching value of field effect transistor, the effect that high-voltage linear constant current drives can be reached, simultaneously, the present embodiment is provided with constant flow regulation circuit as feedback, particularly variable-resistance setting, the present embodiment is made to strengthen by feedback the effect that the control of governor circuit to field effect transistor reaches high-efficiency environment friendly.
Above-described embodiment is one of the present invention preferably scheme, not does any pro forma restriction to the present invention, also has other variant and remodeling under the prerequisite not exceeding the technical scheme described in claim.
Claims (7)
1. the LED high-voltage linear constant current drive circuit of a high-efficiency environment friendly, connect power supply, load is powered, it is characterized in that: comprise rectifier circuit, filter circuit, governor circuit, reference voltage circuit, constant flow regulation circuit and output control circuit, described rectifier circuit input is connected with power supply, the output of rectifier circuit is electrically connected with reference voltage circuit by filter circuit, the reference output of reference voltage circuit is connected with the reference voltage input of described governor circuit, the power end of reference voltage circuit is connected with described governor circuit power end, the feedback end of described governor circuit is connected with the earth terminal of governor circuit by constant flow regulation circuit, the output of described governor circuit is connected with described load by output control circuit, described governor circuit comprises power supply circuits, logic control circuit, protective circuit, Drive and Control Circuit, compensate and start control circuit and field effect transistor Q1 and amplifier, the input of described power supply circuits is connected with the power end of described reference voltage circuit, logic control circuit, protective circuit, Drive and Control Circuit, compensate and start control circuit and power by power supply circuits, the input of described logic control circuit is connected with the reference output of described reference voltage circuit, the control end of described logic control circuit is connected with described protective circuit, the output of described logic control circuit is connected with the control end of described driving control device, the input of driving control device is connected with the output of described amplifier, the positive input terminal of amplifier and described compensation and start control circuit and be connected, the negative input end of amplifier is connected with described constant flow regulation circuit as the feedback end of governor circuit, the output of Drive and Control Circuit is connected with the grid of described field effect transistor Q1, the source electrode of described field effect transistor Q1 is connected with the negative input end of described amplifier, the drain electrode of described field effect transistor Q1 is connected with described load by output control circuit as the output of governor circuit, described reference voltage circuit comprises resistance R1, resistance R2, resistance R3 and electric capacity C2, first conduction terminal of described resistance R1 is connected with the positive pole of electric capacity C1, second conduction terminal of resistance R1 and first conduction terminal of resistance R2, first conduction terminal of electric capacity C2 and the power supply circuits of governor circuit connect, second conduction terminal of resistance R2 is connected with the reference voltage input of governor circuit, second conduction terminal of described resistance R2 is also connected with the earth terminal of governor circuit by resistance R3, second conduction terminal of electric capacity C2 is connected with the earth terminal of governor circuit, described constant flow regulation circuit comprises power transformation resistance R5 and resistance R4, first conduction terminal of described power transformation resistance R5 is connected with the feedback end of described governor circuit, the power transformation end of described power transformation resistance R5 is connected with the earth terminal of governor circuit by resistance R4.
2. the LED high-voltage linear constant current drive circuit of high-efficiency environment friendly according to claim 1, is characterized in that: described field effect transistor Q1 is N channel field-effect pipe.
3. the LED high-voltage linear constant current drive circuit of high-efficiency environment friendly according to claim 1, it is characterized in that: described rectifier circuit comprises diode D1, diode D2, diode D3 and diode D4, described filter circuit comprises electric capacity C1, the anode of diode D1 is connected with described power supply, the anode of diode D1 is connected with the negative electrode of described diode D3, the anode of diode D2 is connected with described power supply, the negative electrode of diode D2 is connected with the negative electrode of described diode D1, the negative electrode of diode D2 is also connected with the positive pole of described electric capacity C1, the anode of diode D2 is connected with the negative electrode of diode D4, the anode of diode D4 is connected with the anode of described diode D3, the anode of diode D4 is connected with the negative pole of described electric capacity C1.
4. the LED high-voltage linear constant current drive circuit of high-efficiency environment friendly according to claim 1, it is characterized in that: described output control circuit comprises field effect transistor Q2, resistance R6 and resistance R7, first conduction terminal of described resistance R6 is connected with the output of described governor circuit, second conduction terminal of described resistance R6 is connected with the grid of described field effect transistor Q2, the power transformation end that source electrode and the described power transformation of described field effect transistor Q2 hinder R5 is connected, the source drain of described field effect transistor Q2 is connected with described load negative pole, the first end of described resistance R7 is connected with second end of described resistance R6, second end of described resistance R7 is connected with the output of described rectifier bridge, second end of described resistance R7 is also connected with the positive pole of described load.
5. the LED high-voltage linear constant current drive circuit of high-efficiency environment friendly according to claim 4, is characterized in that: described field effect transistor Q2 is N channel field-effect pipe.
6. the LED high-voltage linear constant current drive circuit of high-efficiency environment friendly according to claim 4, is characterized in that: described load is LED.
7. the LED high-voltage linear constant current drive circuit of high-efficiency environment friendly according to claim 1, is characterized in that: described power supply circuits also include calculating voltage delivery outlet, and described calculating voltage delivery outlet is connected with the positive input terminal of described amplifier.
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| CN201310094317.1A CN103338547B (en) | 2013-03-22 | 2013-03-22 | High efficient and environmental friendly LED high-voltage linear constant current driving circuit |
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| CN104684192B (en) * | 2013-12-03 | 2018-11-06 | 深圳市海洋王照明工程有限公司 | A kind of driving circuit and lamps and lanterns |
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| CN101534587A (en) * | 2009-03-27 | 2009-09-16 | 陕西科技大学 | Commercial power LED constant current driver |
| US20110074372A1 (en) * | 2009-02-18 | 2011-03-31 | William Yu | Architecture of a Power Supply Circuit with Power Factor Correction |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110074372A1 (en) * | 2009-02-18 | 2011-03-31 | William Yu | Architecture of a Power Supply Circuit with Power Factor Correction |
| CN101534587A (en) * | 2009-03-27 | 2009-09-16 | 陕西科技大学 | Commercial power LED constant current driver |
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| "一种照明应急两用的驱动电路设计";满瑞等;《数字通信》;20120430(第2期);81-84 * |
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