CN103619110A - Circuit and method for improving resistance capacitance voltage-reducing constant current accuracy - Google Patents
Circuit and method for improving resistance capacitance voltage-reducing constant current accuracy Download PDFInfo
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- CN103619110A CN103619110A CN201310664944.4A CN201310664944A CN103619110A CN 103619110 A CN103619110 A CN 103619110A CN 201310664944 A CN201310664944 A CN 201310664944A CN 103619110 A CN103619110 A CN 103619110A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to the field of electronic circuits, and discloses a circuit and a method for improving a resistance capacitance voltage-reducing constant current accuracy. The circuit comprises a constant current module circuit, a resistance capacitance voltage-reducing circuit and a rectifying circuit, wherein the resistance capacitance voltage-reducing circuit is connected with the rectifying circuit and is used for resistance capacitance voltage-reducing rectification; the constant current module circuit is connected with the rectifying circuit and is used for realizing electric current constancy; when the load voltage changes or an input network voltage waves, the constant current module circuit controls the voltage drop to regulate the voltage drop of the two ends of the resistance capacitance voltage-reducing circuit, the voltage drop of the two ends of the resistance capacitance voltage-reducing circuit is stable, and the high precision constant current is provided for the load in a circuit. According to the technical scheme, the circuit and the method provided by the invention have the advantages that the constant current accuracy of the resistance capacitance voltage-reducing circuit is improved, and the cost is low.
Description
Technical field
The present invention relates to electronic circuit field, particularly a kind of circuit and method that improves resistance-capacitance depressurization constant current accuracy.
Background technology
Capacitance-resistance voltage reduction circuit is that the capacitive reactance that utilizes electric capacity to produce under certain AC signal frequency limits maximum output current.When electric capacity both end voltage fluctuates, (load change or input power network fluctuation) output current will cause larger fluctuation, causes output current constant current accuracy variation, is particularly applied in LED lighting field.
At present, huge numbers of families are come in LED illumination just step by step, and capacitance-resistance voltage reduction circuit low-cost, high performance-price ratio will welcome new opportunity, but because the constant current drive characteristic of LED and the poor problem of resistance-capacitance depressurization constant current accuracy will be the huge challenge that designer faces again.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of circuit that improves resistance-capacitance depressurization constant current accuracy, for solving the problem of capacitance-resistance voltage reduction circuit two ends fluctuation of pressure drop, improve the constant current accuracy of capacitance-resistance voltage reduction circuit, and cost is low, simple in structure.
A kind of circuit that improves resistance-capacitance depressurization constant current accuracy that the embodiment of the present invention provides, comprising: constant flow module circuit, capacitance-resistance voltage reduction circuit, rectification circuit, wherein,
Described capacitance-resistance voltage reduction circuit is connected with described rectification circuit, for resistance-capacitance depressurization rectification,
Described constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit, for realizing current constant,
When load voltage changes or inputs voltage ripple of power network, described constant flow module circuit regulates the pressure drop at described capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, make the pressure drop at described capacitance-resistance voltage reduction circuit two ends stable, for the load in circuit provides high accuracy constant electric current.
Alternatively, described constant flow module circuit comprises at least two pins.
Alternatively, described load is LED lamp.
Alternatively, described constant flow module circuit comprises integration module circuit and discrete electronic component.
Alternatively, described capacitance-resistance voltage reduction circuit comprises the first capacitor C 1 and first resistance R 1 in parallel with described the first capacitor C 1.
Alternatively, also comprise the second resistance R 2, the 3rd resistance, the 4th resistance, the second filter capacitor C2, wherein, described rectification circuit is rectifier bridge D1,
An input of the described rectifier bridge D1 of access after described the first resistance R 1 is in parallel with described the first capacitor C 1, described the second resistance R 2 is connected into described another input of rectifier bridge D1.
The negative pole of output end of described rectifier bridge D1 is connected with negative pole, the 4th resistance of described the second filter capacitor C2 respectively,
By described the 3rd resistance, positive pole, the 4th resistance other end respectively at described the second filter capacitor C2 connects the output head anode of described rectifier bridge D1.
Alternatively, described constant flow module circuit comprises NPN triode Q1, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, voltage-stabiliser tube D2, wherein,
The base stage of described triode Q1 is connected with the positive pole of described the second filter capacitor C2 by described the 5th resistance R 5, the 6th resistance R 6 and the first pin, the collector electrode of described triode Q1 is connected with the negative pole of described the second filter capacitor C2 by the second pin, the emitter of described triode Q1 is connected with the 3rd pin by described the 7th resistance R 7
The negative pole of described voltage-stabiliser tube D2 is connected with the base stage of described triode Q1, and the positive pole of described voltage-stabiliser tube D2 is connected with described the 3rd pin,
Described the 3rd pin is connected with the negative pole of described load, and it is anodal that described load positive pole meets described the second filter capacitor C2,
Described voltage-stabiliser tube D2 pressure drop is that VD2, triode Q1 base stage and emitter voltage drop are that VBE, triode Q1 collector electrode and emitter voltage drop are VCE,
When system stability, the constant output current of described constant flow module circuit, at (VD2-VBE)/R7, regulates the resistance of the 7th resistance R 7 or the constant output current that voltage-stabiliser tube D2 pressure drop VD2 can regulate described constant flow module circuit,
When input voltage increases, VCE increases to guarantee that the first capacitor C 1 two ends pressure drop is constant, constant output current,
When input voltage reduces, VCE reduces to guarantee that the first capacitor C 1 two ends pressure drop is constant, constant output current.
Wherein, the present invention also provides a kind of method that improves resistance-capacitance depressurization constant current accuracy, and constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit,
When load voltage changes or while inputting voltage ripple of power network, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, make the pressure drop at described capacitance-resistance voltage reduction circuit two ends stable, thereby improve the constant current accuracy of described capacitance-resistance voltage reduction circuit, for the load in circuit provides high accuracy constant electric current.
Alternatively, described resistance-capacitance depressurization rectification circuit comprises the first capacitor C 1 and first resistance R 1, the rectifier bridge D1 in parallel with described the first capacitor C 1, an input of the described rectifier bridge D1 of access after described the first resistance R 1 is in parallel with described the first capacitor C 1.
Alternatively, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, makes the pressure drop at described capacitance-resistance voltage reduction circuit two ends stable, specifically,
When load voltage increases, maybe when input line voltage is when reduce, constant flow module circuit reduces to stablize the pressure drop at the first capacitor C 1 two ends by controlling its pressure drop,
When load voltage reduces, maybe when input line voltage increases, constant flow module circuit increases to stablize the pressure drop at the first capacitor C 1 two ends by controlling its pressure drop.
Therefore, application the present embodiment technical scheme, owing to having solved the problem of capacitance-resistance voltage reduction circuit its two ends fluctuation of pressure drop when load change or the input power network fluctuation, make the pressure drop at described capacitance-resistance voltage reduction circuit two ends keep stable, effectively solved capacitance-resistance voltage reduction circuit to load change or inputted the constant current accuracy problem that power network fluctuation brings.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of electrical block diagram that improves resistance-capacitance depressurization constant current accuracy provided by the invention;
Fig. 2 is a kind of circuit diagram that improves resistance-capacitance depressurization constant current accuracy provided by the invention;
Fig. 3 is a kind of method flow diagram that improves resistance-capacitance depressurization constant current accuracy provided by the invention;
Fig. 4 is a kind of method flow diagram that improves resistance-capacitance depressurization constant current accuracy provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
embodiment 1:
The present embodiment provides a kind of circuit that improves resistance-capacitance depressurization constant current accuracy, comprising: capacitance-resistance voltage reduction circuit 01, rectification circuit 02, constant flow module circuit 03, wherein,
Described capacitance-resistance voltage reduction circuit 01 is connected with described rectification circuit 02, for resistance-capacitance depressurization rectification,
Described constant flow module circuit 03 is connected with resistance-capacitance depressurization rectification circuit, for realizing current constant,
When load voltage changes or inputs voltage ripple of power network, described constant flow module circuit 03 regulates the pressure drop at described capacitance-resistance voltage reduction circuit 01 two ends by controlling its pressure drop, make the pressure drop at described capacitance-resistance voltage reduction circuit 01 two ends stable, for the load in circuit provides high accuracy constant electric current.
Can be, but not limited to, described constant flow module circuit 03 comprises at least two pins.
Can be, but not limited to, described load is LED lamp, or other constant current driving devices.
Can be, but not limited to, described constant flow module circuit 03 comprises integration module circuit and discrete electronic component.
Therefore, when load change or input power network fluctuation, can make the pressure drop at described capacitance-resistance voltage reduction circuit two ends keep stable, effectively solved capacitance-resistance voltage reduction circuit to load change or inputted the constant current accuracy problem that power network fluctuation brings.
embodiment 2:
The difference of the present embodiment and embodiment 1 is, as shown in Figure 2, described capacitance-resistance voltage reduction circuit 01 comprises the first capacitor C 1 and first resistance R 1 in parallel with described the first capacitor C 1.
Can be, but not limited to, also comprise the 3rd resistance R 3, the 4th resistance R 4, the second filter capacitor C2, wherein, described rectification circuit 02 is rectifier bridge D1,
An input of the described rectifier bridge D1 of access after described the first resistance R 1 is in parallel with described the first capacitor C 1; Can be, but not limited to, also comprise the second resistance R 2, described the second resistance R 2 is connected into described another input of rectifier bridge D1.
The negative pole of output end of described rectifier bridge D1 is connected with negative pole, the 4th resistance R 4 of described the second filter capacitor C2 respectively,
By described the 3rd resistance R 3, positive pole, the 4th resistance R 4 other ends respectively at described the second filter capacitor C2 connect the output head anode of described rectifier bridge D1.
Can be, but not limited to, described constant flow module circuit 03 comprises NPN triode Q1, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, voltage-stabiliser tube D2, wherein,
The base stage of described triode Q1 is connected with the positive pole of described the second filter capacitor C2 by described the 5th resistance R 5, the 6th resistance R 6 and the first pin, the collector electrode of described triode Q1 is connected with the negative pole of described the second filter capacitor C2 by the second pin, the emitter of described triode Q1 is connected with the 3rd pin by described the 7th resistance R 7
The negative pole of described voltage-stabiliser tube D2 is connected with the base stage of described triode Q1, and the positive pole of described voltage-stabiliser tube D2 is connected with described the 3rd pin,
Described the 3rd pin is connected with the negative pole of described load, and it is anodal that described load positive pole meets described the second filter capacitor C2.
Described voltage-stabiliser tube D2 pressure drop is that VD2, triode Q1 base stage and emitter voltage drop are that VBE, triode Q1 collector electrode and emitter voltage drop are VCE,
When system stability, the constant output current of described constant flow module circuit, at (VD2-VBE)/R7, regulates the resistance of the 7th resistance R 7 or the constant output current that voltage-stabiliser tube D2 pressure drop VD2 can regulate described constant flow module circuit,
When input voltage increases, VCE increases to guarantee that the first capacitor C 1 two ends pressure drop is constant, constant output current,
When input voltage reduces, VCE reduces to guarantee that the first capacitor C 1 two ends pressure drop is constant, constant output current.
Therefore, when load change or input power network fluctuation, by regulating described triode Q1 collector electrode and emitter voltage drop VCE, can make the pressure drop at described capacitance-resistance voltage reduction circuit two ends keep stable, effectively solved capacitance-resistance voltage reduction circuit to load change or inputted the constant current accuracy problem that power network fluctuation brings.
embodiment 3:
The present invention also provides a kind of method that improves resistance-capacitance depressurization constant current accuracy, as shown in Figure 3, comprising: 04, constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit.
Can be, but not limited to, described resistance-capacitance depressurization rectification circuit comprises the first capacitor C 1 and first resistance R 1, the rectifier bridge D1 in parallel with described the first capacitor C 1, an input of the described rectifier bridge D1 of access after described the first resistance R 1 is in parallel with described the first capacitor C 1.
05, when load voltage changes or while inputting voltage ripple of power network, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, makes the pressure drop at described capacitance-resistance voltage reduction circuit two ends stable.Thereby improve the constant current accuracy of described capacitance-resistance voltage reduction circuit, for the load in circuit provides high accuracy constant electric current.
Can be, but not limited to, as shown in Figure 4, described constant flow module circuit regulates the pressure drop at described the first capacitor C 1 two ends by controlling its pressure drop, makes the pressure drop at described the first capacitor C 1 two ends stable, specifically,
06, when load voltage increases maybe when input line voltage is when reduce, constant flow module circuit reduces to stablize the pressure drop at the first capacitor C 1 two ends by controlling its pressure drop,
When load voltage reduces, maybe when input line voltage increases, constant flow module circuit increases to stablize the pressure drop at the first capacitor C 1 two ends by controlling its pressure drop.
Therefore technique scheme has effectively solved capacitance-resistance voltage reduction circuit to load change or has inputted the constant current accuracy problem that power network fluctuation brings.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The modification of doing within any spirit at above-mentioned execution mode and principle, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.
Claims (10)
1. a circuit that improves resistance-capacitance depressurization constant current accuracy, is characterized in that, comprising: constant flow module circuit, capacitance-resistance voltage reduction circuit, rectification circuit, wherein,
Described capacitance-resistance voltage reduction circuit is connected with described rectification circuit, for resistance-capacitance depressurization rectification,
Described constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit, for realizing current constant,
When load voltage changes or inputs voltage ripple of power network, described constant flow module circuit regulates the pressure drop at described capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, make the pressure drop at described capacitance-resistance voltage reduction circuit two ends stable, for the load in circuit provides high accuracy constant electric current.
2. a kind of circuit that improves resistance-capacitance depressurization constant current accuracy as claimed in claim 1, is characterized in that, described constant flow module circuit comprises at least two pins.
3. a kind of circuit that improves resistance-capacitance depressurization constant current accuracy as claimed in claim 1, is characterized in that, described load is LED lamp.
4. a kind of circuit that improves resistance-capacitance depressurization constant current accuracy as claimed in claim 1, is characterized in that, described constant flow module circuit comprises integration module circuit and discrete electronic component.
5. as a kind of circuit that improves resistance-capacitance depressurization constant current accuracy as described in arbitrary in claim 1 to 4, it is characterized in that, described capacitance-resistance voltage reduction circuit comprises the first capacitor C 1 and first resistance R 1 in parallel with described the first capacitor C 1.
6. a kind of circuit that improves resistance-capacitance depressurization constant current accuracy as claimed in claim 5, is characterized in that, also comprises the second resistance R 2, the 3rd resistance, the 4th resistance, the second filter capacitor C2, and wherein, described rectification circuit is rectifier bridge D1,
An input of the described rectifier bridge D1 of access after described the first resistance R 1 is in parallel with described the first capacitor C 1, described the second resistance R 2 is connected into described another input of rectifier bridge D1,
The negative pole of output end of described rectifier bridge D1 is connected with negative pole, the 4th resistance of described the second filter capacitor C2 respectively,
By described the 3rd resistance, positive pole, the 4th resistance other end respectively at described the second filter capacitor C2 connects the output head anode of described rectifier bridge D1.
7. a kind of circuit that improves resistance-capacitance depressurization constant current accuracy as claimed in claim 6, is characterized in that, described constant flow module circuit comprises NPN triode Q1, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, voltage-stabiliser tube D2, wherein,
The base stage of described triode Q1 is connected with the positive pole of described the second filter capacitor C2 by described the 5th resistance R 5, the 6th resistance R 6 and the first pin, the collector electrode of described triode Q1 is connected with the negative pole of described the second filter capacitor C2 by the second pin, the emitter of described triode Q1 is connected with the 3rd pin by described the 7th resistance R 7
The negative pole of described voltage-stabiliser tube D2 is connected with the base stage of described triode Q1, and the positive pole of described voltage-stabiliser tube D2 is connected with described the 3rd pin,
Described the 3rd pin is connected with the negative pole of described load, and it is anodal that described load positive pole meets described the second filter capacitor C2,
Described voltage-stabiliser tube D2 pressure drop is that VD2, triode Q1 base stage and emitter voltage drop are that VBE, triode Q1 collector electrode and emitter voltage drop are VCE,
When system stability, the constant output current of described constant flow module circuit, at (VD2-VBE)/R7, regulates the resistance of the 7th resistance R 7 or the constant output current that voltage-stabiliser tube D2 pressure drop VD2 can regulate described constant flow module circuit,
When input voltage increases, VCE increases to guarantee that the first capacitor C 1 two ends pressure drop is constant, constant output current,
When input voltage reduces, VCE reduces to guarantee that the first capacitor C 1 two ends pressure drop is constant, constant output current.
8. a method that improves resistance-capacitance depressurization constant current accuracy, is characterized in that, constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit,
When load voltage changes or while inputting voltage ripple of power network, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, make the pressure drop at described capacitance-resistance voltage reduction circuit two ends stable, thereby improve the constant current accuracy of described capacitance-resistance voltage reduction circuit, for the load in circuit provides high accuracy constant electric current.
9. a kind of method that improves resistance-capacitance depressurization constant current accuracy as claimed in claim 8, it is characterized in that, described resistance-capacitance depressurization rectification circuit comprises the first capacitor C 1 and first resistance R 1, the rectifier bridge D1 in parallel with described the first capacitor C 1, an input of the described rectifier bridge D1 of access after described the first resistance R 1 is in parallel with described the first capacitor C 1.
10. a kind of method that improves resistance-capacitance depressurization constant current accuracy as claimed in claim 9, it is characterized in that, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, makes the pressure drop at described capacitance-resistance voltage reduction circuit two ends stable, specifically
When load voltage increases, maybe when input line voltage is when reduce, constant flow module circuit reduces to stablize the pressure drop at the first capacitor C 1 two ends by controlling its pressure drop,
When load voltage reduces, maybe when input line voltage increases, constant flow module circuit increases to stablize the pressure drop at the first capacitor C 1 two ends by controlling its pressure drop.
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| CN201310664944.4A CN103619110B (en) | 2013-12-10 | 2013-12-10 | A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy |
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Cited By (1)
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| CN104302049A (en) * | 2014-09-28 | 2015-01-21 | 宁波公牛光电科技有限公司 | Led power source |
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| CN201260256Y (en) * | 2008-01-21 | 2009-06-17 | 上丰灯泡(深圳)有限公司 | LED driver circuit |
| CN201878375U (en) * | 2010-10-08 | 2011-06-22 | 泉州怡能光电科技有限公司 | LED (light-emitting diode) constant-voltage and constant-current driving circuit |
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