CN101630898B - Circuit for regulating and controlling output power of power supply - Google Patents
Circuit for regulating and controlling output power of power supply Download PDFInfo
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- CN101630898B CN101630898B CN2008103027763A CN200810302776A CN101630898B CN 101630898 B CN101630898 B CN 101630898B CN 2008103027763 A CN2008103027763 A CN 2008103027763A CN 200810302776 A CN200810302776 A CN 200810302776A CN 101630898 B CN101630898 B CN 101630898B
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- power supply
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- thyristor
- pulse signal
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Abstract
The invention provides a circuit for regulating and controlling an output power of a power supply, which comprises signal generating circuit, a photoelectric coupling circuit, a transformation switching circuit and a thyristor. The thyristor is connected between the power supply and a load. The signal generating circuit generates a first pulse signal having an adjustable duty ratio and provides the first pulse signal to the photoelectric coupling circuit. When the first pulse signal has a high electric level, the photoelectric coupling circuit is closed and the photoelectric coupling circuit outputs a sinusoidal signal. The sinusoidal signal is converted into a second pulse signal through the transformation switching circuit so as to control the on and off of the thyristor. When the second pulse signal has a high electric level, the thyristor is turned on and the power supply supplies a power to the load; and when second pulse signal has a low electric level, the thyristor is turned off and the power supply does not supply the power to the load. The circuit for regulating and controlling the output power of the power supply uses the photoelectric coupling circuit to isolate the signal generating circuit and the transformation switching circuit. The photoelectric coupling circuit can effectively inhibit common code interference, and the signal generating circuit regulates and controls the output power of the power supply in unit time by regulating the duty ratio of the first pulse signal.
Description
Technical field
The present invention relates to a kind of circuit for regulating and controlling output power of power supply.
Background technology
Power supply is as a kind of power supply device of extensive use, the control technology of its power output for electronic equipment under various environment, work stable most important.Generally speaking, the driving stage of circuit for regulating and controlling output power of power supply adopts self-excited circuit to produce control signal, and then the power output of regulation and control power supply.Yet it is bigger that the service behaviour of self-excited circuit is influenced by environmental change, and especially its anti-common mode disturbances ability makes that the control signal stability of regulation and control output power of power supply is not high.How to provide the circuit of the stable regulation and control of a kind of energy output power of power supply to become a problem demanding prompt solution.
Summary of the invention
In view of above content, be necessary to provide a kind of circuit for regulating and controlling output power of power supply, can stablize the power output of regulation and control power supply.
A kind of circuit for regulating and controlling output power of power supply, it comprises a signal generating circuit, one photoelectricity coupling circuit, an one transformation change-over circuit and a thyristor, described thyristor is used for being connected between power supply and the load, described signal generating circuit produces first pulse signal of an EDM Generator of Adjustable Duty Ratio, offer described photoelectricity coupling circuit, when described first pulse signal is high level, the inner conducting of described photoelectricity coupling circuit is also exported a sinusoidal signal, described sinusoidal signal is converted to one second pulse signal to control the break-make of described thyristor by described transformation change-over circuit, when described second pulse signal is high level, described thyristor conducting, described power supply is to electric, when described second pulse signal was low level, described thyristor ended, and described power supply is not to electric.
Compared to prior art, circuit for regulating and controlling output power of power supply of the present invention adopts described photoelectricity coupling circuit to isolate described signal generating circuit and described transformation change-over circuit, described photoelectricity coupling circuit can effectively suppress common mode disturbances, described signal generating circuit is regulated and control power supply power-on time to load in the unit interval by the duty ratio of regulating first pulse signal, thus the power output of regulation and control power supply in the unit interval.
Description of drawings
Fig. 1 is the circuit theory diagrams of the better embodiment of circuit for regulating and controlling output power of power supply of the present invention.
Embodiment
In conjunction with embodiment the present invention is described in further detail with reference to the accompanying drawings:
Please refer to Fig. 1, circuit for regulating and controlling output power of power supply of the present invention is used to regulate and control the power output of a power supply U to load P L, and its better embodiment comprises a signal generating circuit 10, a photoelectricity coupling circuit 20, a transformation change-over circuit 30 and a thyristor VT.Described power supply U can be DC power supply or AC power.
Described signal generating circuit 10 comprises three resistance R 1, R2, R3, a capacitor C 1 and single-node transistor V1, described resistance R 1 is a variable resistance, the emitter of described unijunction transistor V1 connects a direct current power Vcc also by described capacitor C 1 ground connection by described resistance R 1, first base stage of described unijunction transistor V1 is by described resistance R 3 ground connection, and second base stage of described unijunction transistor V1 connects described DC power supply Vcc by described resistance R 2.
Described photoelectricity coupling circuit 20 comprises a photoelectrical coupler 11, two resistance R 4, R5, an one diode D2 and a triode V3, described photoelectrical coupler 11 comprises a light-emitting diode D1 and a phototriode V2, the anode of described light-emitting diode D1 connects first base stage of described unijunction transistor V1, the minus earth of described light-emitting diode D1, the emitter of described phototriode V2 connects the base stage of described triode V3 also by described resistance R 4 ground connection, the collector electrode of described phototriode V2 is connected described DC power supply Vcc with the continuous back of the collector electrode of described triode V3 by described resistance R 5, the emitter of described triode V3 connects the negative electrode of described diode D2, the plus earth of described diode D2.
Described transformation change-over circuit 30 comprises a pulse transformer T1, one diode D3, one resistance R 6 and a capacitor C 2, the two ends of described pulse transformer T1 input stage connect emitter and the ground end of described triode V3 respectively, the two ends of described pulse transformer T1 output stage connect the anode of described diode D3 and the negative pole of described power supply U respectively, the negative electrode of described diode D3 connects the control utmost point of described thyristor VT by described resistance R 6, the two ends of described capacitor C 2 connect the control utmost point of described thyristor VT and the negative pole of described power supply U respectively, first main electrode of described thyristor VT connects the positive pole of described power supply U by described load P L, and second main electrode of described thyristor VT connects the negative pole of described power supply U.
Described DC power supply Vcc is described capacitor C 1 charging by described resistance R 1, when the voltage at described capacitor C 1 two ends reaches the conducting voltage of described unijunction transistor V1, described unijunction transistor V1 conducting, described capacitor C 1 is by described resistance R 3 discharges, when the voltage at described capacitor C 1 two ends during less than the conducting voltage of described unijunction transistor V1, described unijunction transistor V1 ends, and described DC power supply Vcc is described capacitor C 1 charging by described resistance R 1 once more, repeats said process.Described DC power supply Vcc is described capacitor C 1 cycle charging, makes first base stage of described unijunction transistor V1 export a pulse signal P1.When described pulse signal P1 is high level, described light-emitting diode D1 and the equal conducting of described phototriode V2, described DC power supply Vcc provides quiescent operation voltage for described triode V3, described triode V3 conducting.The emitter of described triode V3 is exported a sinusoidal signal, described sinusoidal signal is coupled to the anode of described diode D3 by described pulse transformer T1, the negative electrode of described diode D3 is exported a pulse signal P2, and described pulse signal P2 is through the break-make of the described thyristor VT of control after described capacitor C 2 filtering.When described pulse signal P2 is high level, described thyristor VT conducting, described power supply U is to load P L power supply, on the contrary described thyristor VT ends, and described power supply U does not power to load P L.When described pulse signal P1 was low level, described photoelectricity coupling circuit 20 was not all worked with described transformation change-over circuit 30, and described thyristor VT ends, and described power supply U does not power to load P L.
The duty ratio of described pulse signal P1 is by the charging coefficient r1*c1 and discharge coefficient (r3+rb1) the * c1 decision of described capacitor C 1.Wherein, r1 is the resistance of described resistance R 1, and r3 is the resistance of described resistance R 3, and rb1 is the resistance of first base resistance of described unijunction transistor V1, and c1 is the appearance value of described capacitor C 1.By the resistance of regulating described resistance R 1 is the charging coefficient r1*c1 of the described capacitor C 1 of scalable, thus the duty ratio of regulating described pulse signal P1.In the unit interval, the time that described pulse signal P1 is a high level is the ON time of described light-emitting diode D1 and described phototriode V2, also is the emitter output sinusoidal signal of described triode V3 and the time that described diode D3 exports described pulse signal P2.And described pulse signal P2 is the ON time of described thyristor VT and the described power supply U power-on time to load for the time of high level in the unit interval.So, be the described power supply U of scalable external power-on time and power output in the unit interval by the resistance of regulating described resistance R 1.
Light-emitting diode D1 and the coupling capacitance between the phototriode V2 in the described photoelectrical coupler 11 are very little, described pulse signal P1 is very little to the output current influence of described photoelectrical coupler 11 by the interpolar coupling capacitance, thereby described photoelectrical coupler 11 common-mode rejection ratios are very high.So, the better embodiment of circuit for regulating and controlling output power of power supply of the present invention adopts described photoelectricity coupling circuit 20 to isolate described signal generating circuit 10 and described transformation change-over circuit 30, described photoelectricity coupling circuit 20 can effectively suppress common mode disturbances, described signal generating circuit 10 is stablized the described power supply U of regulation and control power-on time to described load P L in the unit interval by the duty specific energy of regulating the first pulse signal P1, thereby regulates and control the power output of described power supply U in the unit interval.
Claims (4)
1. circuit for regulating and controlling output power of power supply, it comprises a signal generating circuit, one photoelectricity coupling circuit, an one transformation change-over circuit and a thyristor, described thyristor is used for being connected between power supply and the load, described signal generating circuit produces first pulse signal of an EDM Generator of Adjustable Duty Ratio, offer described photoelectricity coupling circuit, when described first pulse signal is high level, the inner conducting of described photoelectricity coupling circuit is also exported a sinusoidal signal, described sinusoidal signal is converted to one second pulse signal to control the break-make of described thyristor by described transformation change-over circuit, when described second pulse signal is high level, described thyristor conducting, described power supply is to electric, when described second pulse signal was low level, described thyristor ended, and described power supply is not to electric.
2. circuit for regulating and controlling output power of power supply as claimed in claim 1, it is characterized in that: described signal generating circuit comprises one first resistance, one second resistance, one the 3rd resistance, one electric capacity and single-node transistor, described first resistance is a variable resistance, described signal generating circuit changes the duty ratio of described first pulse signal by the resistance of regulating described first resistance, the emitter of described unijunction transistor connects a direct current power supply by described first resistance, and the emitter of described unijunction transistor is by described capacity earth, first base stage of described unijunction transistor is by described the 3rd grounding through resistance, second base stage of described unijunction transistor connects described DC power supply by described second resistance, and first base stage of described unijunction transistor is exported first pulse signal of described signal generating circuit generation and given described photoelectricity coupling circuit.
3. circuit for regulating and controlling output power of power supply as claimed in claim 1, it is characterized in that: described photoelectricity coupling circuit comprises a photoelectrical coupler, one first resistance, one second resistance, one diode and a triode, described photoelectrical coupler comprises a light-emitting diode and a phototriode, the anode of described light-emitting diode connects described signal generating circuit to receive described first pulse signal, the minus earth of described light-emitting diode, the emitter of described phototriode connects the base stage of described triode, and the emitter of described phototriode is by described first grounding through resistance, the collector electrode of described phototriode is connected a direct current power supply with the continuous back of the collector electrode of described triode by described second resistance, the emitter of described triode connects the negative electrode of described diode, and the emitter of described triode links to each other the plus earth of described diode with described transformation change-over circuit.
4. circuit for regulating and controlling output power of power supply as claimed in claim 1, it is characterized in that: described transformation change-over circuit comprises a pulse transformer, one diode, one resistance and an electric capacity, the two ends of described pulse transformer input stage connect described photoelectricity coupling circuit and ground end respectively, the two ends of described pulse transformer output stage connect the anode of described diode and the negative pole of described power supply respectively, the negative electrode of described diode connects the control utmost point of described thyristor by described resistance, the negative electrode of described diode also is used for exporting described second pulse signal, the two ends of described electric capacity connect the control utmost point of described thyristor and the negative pole of described power supply respectively, first main electrode of described thyristor is used for connecting by described load the positive pole of described power supply, and second main electrode of described thyristor is used for connecting the negative pole of described power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008103027763A CN101630898B (en) | 2008-07-17 | 2008-07-17 | Circuit for regulating and controlling output power of power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008103027763A CN101630898B (en) | 2008-07-17 | 2008-07-17 | Circuit for regulating and controlling output power of power supply |
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| Publication Number | Publication Date |
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| CN101630898A CN101630898A (en) | 2010-01-20 |
| CN101630898B true CN101630898B (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008103027763A Expired - Fee Related CN101630898B (en) | 2008-07-17 | 2008-07-17 | Circuit for regulating and controlling output power of power supply |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427639A (en) * | 2012-05-16 | 2013-12-04 | 江苏施诺照明有限公司 | Isolating-type 0-10V zero-power control circuit |
| CN103683861B (en) * | 2013-11-28 | 2016-01-20 | 中冶南方（武汉）自动化有限公司 | A kind of novel thyristor gating circuit |
| CN110350807A (en) * | 2018-04-08 | 2019-10-18 | 佛山科学技术学院 | A kind of rectification module for UPS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1057914A (en) * | 1990-07-05 | 1992-01-15 | 邹鹏程 | Thyristor voltage stabilized source |
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- 2008-07-17 CN CN2008103027763A patent/CN101630898B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1057914A (en) * | 1990-07-05 | 1992-01-15 | 邹鹏程 | Thyristor voltage stabilized source |
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| CN101630898A (en) | 2010-01-20 |
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