CN101382814B - PWM controlled RC step-down power supply circuit based on feedback - Google Patents
PWM controlled RC step-down power supply circuit based on feedback Download PDFInfo
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- CN101382814B CN101382814B CN200710045696XA CN200710045696A CN101382814B CN 101382814 B CN101382814 B CN 101382814B CN 200710045696X A CN200710045696X A CN 200710045696XA CN 200710045696 A CN200710045696 A CN 200710045696A CN 101382814 B CN101382814 B CN 101382814B
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Abstract
The invention relates to a PWM-controlled RC voltage-reducing power supply circuit based on feedback, which comprises a CCB capacitor, an electrolytic capacitor, a rectifier diode, a voltage stabilizing diode, resistors and also a power triode and a single chip; the duty ratio of the PWM output of a single chip is adjusted by an A/D port of the single chip so as to control the voltage of a circuit. The PWM output of an MCU of the single chip is serially connected with a base electrode of the power triode by the resistor; the power triode is connected with a resistor R-J in parallel at the two ends of a load. The A/D port of the MCU of the single chip is connected with the connection part of two series resistors R1 and R2; the R1 and the R2 are connected with the load in parallel. The PWM-controlled RC voltage-reducing power supply circuit is applicable to the condition of dynamic load, has the functions of stabilizing voltage and reducing fluctuation and has very strong original price competitiveness to the load with relative small power, such as a PCB of a household appliance, and the like.
Description
Technical field
The invention belongs to the electrical engineering field, relate to the RC step-down power supply circuit.
Background technology
At present the copper valency is high, uses the also corresponding raising of circuit price of electromagnetic principle power supply, sees the surging of energy prices from long-range viewpoint, and the price of copper must rise, thus a kind of copper that do not use is provided, and the circuit of relatively stable voltage can be provided is necessary.
Tradition RC reduction voltage circuit (as shown in Figure 1) has utilized the high resistant characteristic of electric capacity under the low-frequency ac state; The capacitive reactance that under certain AC signal frequency, produces through electric capacity limits maximum operating currenbt, and in fact capacitor plays the role of a restriction electric current and dynamic assignment capacitor and load voltage.But traditional RC reduction voltage circuit requires load constant and little, otherwise voltage fluctuation is very big, and is extremely unstable.Thereby traditional RC reduction voltage circuit is not suitable for the dynamic load condition, can't be widely used.
Summary of the invention
The object of the present invention is to provide a kind of PWM control RC step-down power supply circuit, traditional RC reduction voltage circuit can be applied under the situation of load dynamic change based on feedback.
For reaching above purpose, the solution that the present invention adopted is:
PWM control RC step-down power supply circuit based on feedback comprises CBB electric capacity, electrochemical capacitor, and commutation diode, voltage stabilizing diode, resistance also comprises pliotron, single-chip microcomputer.Dutycycle through the change in voltage of Chip Microcomputer A/D port is regulated SCM PWM output reaches control circuit voltage.
Further; The PWM output of single-chip microprocessor MCU is in series through the base stage of resistance and pliotron; The collector of pliotron is connected with one resistance R-J, and the emitter of pliotron links to each other with load, and pliotron and resistance R-J are connected in parallel on the load two ends.
The A/D port of single-chip microprocessor MCU links to each other with the junction of two resistance in series R1, R2, and R1, R2 are parallelly connected with load.
Owing to adopted such scheme, the present invention to have following characteristics:
The PWM control RC step-down power supply circuit that the present invention is based on feedback can be applicable to the dynamic load condition, plays burning voltage, the effect that reduces to fluctuate, and, very strong original cost competitive power is arranged for the smaller load of household electrical appliances PCB constant power.
Description of drawings
Fig. 1 is the schematic diagram of traditional RC reduction voltage circuit.
Fig. 2 is the schematic diagram of an embodiment of the present invention based on the PWM control RC step-down power supply circuit of feedback.
Embodiment
Below in conjunction with the accompanying drawing illustrated embodiment the present invention is further described.
As shown in Figure 2, the PWM control RC step-down power supply circuit based on feedback comprises CBB electric capacity, electrochemical capacitor, commutation diode, voltage stabilizing diode, pliotron, resistance, single-chip microcomputer.This circuit is on the basis of traditional RC reduction voltage circuit, to have increased (playing on-off action) pliotron; Single-chip microcomputer and some resistance; Wherein the PWM of single-chip microprocessor MCU output is in series through the base stage 2 of resistance and pliotron; The collector 3 of pliotron is connected with one resistance R-J, and emitter 1 links to each other with load, and pliotron and resistance R-J are parallel to the load two ends; While load two ends also connect R1, two resistance of R2, and the centre of two resistance links to each other with the A/D port of single-chip microcomputer.Each element all is a common components, as long as satisfy the requirement of voltage and power, for example CBB electric capacity uses withstand voltage 270V, and commutation diode uses 1N4007, and electrochemical capacitor uses the withstand voltage element of 450V.
It is Uad that MCU detects the A/D port voltage, and extrapolating load voltage is Ue '=Uad (1+R2/R1), compares with load rating WV Ue; If Ue '＞Ue; Then strengthen the dutycycle of MCU PWM output, if Ue '＜Ue then reduces the dutycycle that MCU PWM exports; Its dutycycle is unrestricted, and variable range is 0%～100%.
In simple terms, be exactly that output current is a definite value when using the RC reduction voltage circuit; The electric current summation that promptly flows through load and resistance R-J is certain, and when load diminishes, the electric current that flows through resistance R-J so just needs to strengthen; Otherwise load voltage will become greatly, causes job insecurity, at this time increases the dutycycle of PWM output; The electric current that flows through resistance R-J is strengthened, reach the effect of voltage stabilizing; In addition, when load becomes big, the electric current that flows through resistance R-J so just need reduce, otherwise load voltage will diminish, and causes job insecurity, at this time reduces the dutycycle that PWM exports, and the electric current that flows through resistance R-J is reduced, and reaches the effect of voltage stabilizing equally.
The present invention has very strong original cost competitive power for the smaller load of household electrical appliances PCB constant power.
The above-mentioned description to embodiment is can understand and use the present invention for ease of the those of ordinary skill of this technical field.The personnel of skilled obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (1)
1. based on the PWM control RC step-down power supply circuit of feedback, comprise CBB electric capacity, electrochemical capacitor; Commutation diode, voltage stabilizing diode, resistance; It is characterized in that: also comprise pliotron, single-chip microcomputer, the dutycycle of regulating SCM PWM output through the change in voltage of Chip Microcomputer A/D port; Reach control circuit voltage, wherein:
After said CBB electric capacity (C) is connected in parallel with first resistance, be connected the ac input end of the rectifier bridge that constitutes by four commutation diodes, be connected with load between two dc output ends of said rectifier bridge;
It is parallelly connected after said voltage stabilizing diode is connected with second resistance with said load; Said electrochemical capacitor is parallelly connected with said load;
The 3rd resistance and the 4th resistance series connection back are parallelly connected with said load, and the junction of said the 3rd resistance and said the 4th resistance links to each other with said Chip Microcomputer A/D port;
The series arm of said pliotron and the 5th resistance is connected in parallel on said load two ends, and wherein, the collector of said pliotron links to each other with said the 5th resistance, and base stage connects said SCM PWM output through a resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710045696XA CN101382814B (en) | 2007-09-07 | 2007-09-07 | PWM controlled RC step-down power supply circuit based on feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710045696XA CN101382814B (en) | 2007-09-07 | 2007-09-07 | PWM controlled RC step-down power supply circuit based on feedback |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101382814A CN101382814A (en) | 2009-03-11 |
| CN101382814B true CN101382814B (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710045696XA Active CN101382814B (en) | 2007-09-07 | 2007-09-07 | PWM controlled RC step-down power supply circuit based on feedback |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026595B (en) * | 2017-06-20 | 2019-12-06 | 广东美的环境电器制造有限公司 | motor speed regulation circuit, method and device |
| CN109448355A (en) * | 2018-11-10 | 2019-03-08 | 慈溪市栋电子有限公司 | IR remote controller controlled wireless remote control socket |
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| CN101382814A (en) | 2009-03-11 |
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