CN103558889A - Power supply output voltage adjusting circuit - Google Patents
Power supply output voltage adjusting circuit Download PDFInfo
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- CN103558889A CN103558889A CN201310539809.7A CN201310539809A CN103558889A CN 103558889 A CN103558889 A CN 103558889A CN 201310539809 A CN201310539809 A CN 201310539809A CN 103558889 A CN103558889 A CN 103558889A
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Abstract
The invention discloses a power supply output voltage adjusting circuit, which comprises a single-chip microcomputer, a digital keyboard, an electric quantity detection chip, a signal processor and a voltage feedback circuit, wherein the digital keyboard and the electric quantity detection chip are connected to the single-chip microcomputer; the signal processor is connected to the output end of an active low-pass filter; the voltage feedback circuit is connected to the output end of the signal processor; the output end of the voltage feedback circuit is connected to the input end of the electric quantity detection chip; the output end of the electric quantity detection chip is connected to the single-chip microcomputer. According to the power supply output voltage adjusting circuit, a set value of the output voltage can be adjusted through the digital keyboard and is input into the single-chip microcomputer, the single-chip microcomputer is used for outputting a square-wave signal of which the duty cycle is controlled, the square-wave signal is converted into a reference value of the power supply output voltage via the active low-pass filter, and voltage is output by the signal processor. If the practical output voltage is deviated from a preset value input by the digital keyboard, the electric quantity detection chip is used for feeding the practical voltage value back to the single-chip microcomputer, and the single-chip microcomputer is used for controlling and adjusting the duty cycle of the square-wave signal, so that consistence between the practical output voltage and the preset voltage is realized finally.
Description
Technical field
The present invention relates to power technique fields, be specifically related to a kind of electric power output voltage Circuit tuning.
Background technology
The output voltage benchmark of transmission power supply is realized adjustment by potentiometer, and because potentiometer is physical construction device, its life-span is shorter, cannot accurate adjustment output voltage after damage.And the voltage output value of the output voltage Circuit tuning of transmission power supply is not controlled, so real output value often do not conform to adjusted value, so Voltage-output exists coarse problem.
Summary of the invention
The present invention, in order to overcome the deficiency of above technology, provides a kind of output voltage accurate and controlled electric power output voltage Circuit tuning.
The present invention overcomes the technical scheme that its technical matters adopts:
This electric power output voltage Circuit tuning, comprise single-chip microcomputer, be connected in single-chip microcomputer numeric keypad and electric weight detection chip, be connected in active low-pass filter output terminal signal processor, be connected in the voltage feedback circuit of signal processor output terminal, described voltage feedback circuit output terminal is connected in the input end of electric weight detection chip, and the output terminal of described electric weight detection chip is connected in single-chip microcomputer.
Accurate for the square-wave signal level magnitude that single-chip microcomputer is sent, described active same wave filter comprises triode, two ends are connected to the stabilivolt of transistor emitter and collector, two resistance III and resistance V of mutually connecting, three resistance VI, resistance VII and resistance VIII of mutually connecting, amplifier, the resistance III of described mutual series connection and resistance V two ends are connected to transistor emitter and collector, described resistance III is connected in power supply through resistance II, described resistance V ground connection, the resistance VI of described mutual series connection, resistance VII and resistance VIII one end are connected in the in-phase input end that its other end of transistor collector is connected in amplifier, electric capacity I is connected to resistance VI and resistance VII, electric capacity II is connected to resistance VII and resistance VIII, electric capacity III is connected to the in-phase input end of resistance VIII and amplifier, inverting input and the output terminal of described amplifier are connected in signal processor, the base stage of described triode is connected in single-chip microcomputer through resistance I.
The invention has the beneficial effects as follows: by numeric keypad adjustment, adjust the setting value of output voltage and input single-chip microcomputer, a controlled square-wave signal of dutycycle of single-chip microcomputer output is converted to the reference value of electric power output voltage through active low-pass filter, it is through signal processor output voltage.The actual voltage value of signal processor output is transported to electric weight detection chip through voltage feedback circuit and detects its actual output voltage, if there is deviation with the setting value of inputting by numeric keypad in actual output voltage, electric weight detection chip feeds back to single-chip microcomputer by actual voltage value, Single-chip Controlling is adjusted the dutycycle of square-wave signal, finally realizes output voltage consistent with setting voltage.Therefore output voltage is because closed loop is controlled, so output valve is accurate, and with respect to traditional potentiometer adjustment, owing to there is no therefore its long service life of physical construction components and parts.
Accompanying drawing explanation
Fig. 1 is structure connection diagram of the present invention;
Fig. 2 increases and makes Voltage-output accurately improve the electrical block diagram of load capacity between single-chip microcomputer and active low-pass filter;
In figure, 1. resistance I 2. triode 3. stabilivolt 4. resistance II 5. resistance III 6. resistance V 7. resistance VI 8. resistance VII 9. resistance VIII 10. electric capacity I 11. electric capacity II 12. electric capacity III 13. amplifiers.
Embodiment
Below in conjunction with accompanying drawing 1, the present invention will be further described for accompanying drawing 2.
As shown in Figure 1, this electric power output voltage Circuit tuning, comprise single-chip microcomputer, be connected in single-chip microcomputer numeric keypad and electric weight detection chip, be connected in active low-pass filter output terminal signal processor, be connected in the voltage feedback circuit of signal processor output terminal, voltage feedback circuit output terminal is connected in the input end of electric weight detection chip, and the output terminal of electric weight detection chip is connected in single-chip microcomputer.By numeric keypad adjustment, adjusted the setting value of output voltage and inputted single-chip microcomputer, a controlled square-wave signal of dutycycle of single-chip microcomputer output is converted to the reference value of electric power output voltage through active low-pass filter, and it is through signal processor output voltage.The actual voltage value of signal processor output is transported to electric weight detection chip through voltage feedback circuit and detects its actual output voltage, if there is deviation with the setting value of inputting by numeric keypad in actual output voltage, electric weight detection chip feeds back to single-chip microcomputer by actual voltage value, Single-chip Controlling is adjusted the dutycycle of square-wave signal, finally realizes output voltage consistent with setting voltage.Therefore output voltage is because closed loop is controlled, so output valve is accurate, and with respect to traditional potentiometer adjustment, owing to there is no therefore its long service life of physical construction components and parts.
The amplitude out of true of the square-wave signal level that single-chip microcomputer sends, therefore easily causes error, can between single-chip microcomputer and signal processor, increase following active low-pass filter circuit as shown in Figure 2, and it comprises triode 2, two ends are connected to the stabilivolt 3 of triode 2 emitter and collectors, two resistance III 5 and resistance V 6 of mutually connecting, three resistance VI 7, resistance VII 8 and resistance VIII 9 of mutually connecting, amplifier 13, resistance III 5 and resistance V 6 two ends of series connection are connected to triode 2 emitter and collectors mutually, resistance III 5 is connected in power supply through resistance II 4, resistance V 6 ground connection, the resistance VI 7 of mutually connecting, resistance VII 8 and resistance VIII 9 one end be connected in triode 2 current collections extremely the other end be connected in the in-phase input end of amplifier 13, electric capacity I 10 is connected to resistance VI 7 and resistance VII 8, electric capacity II 11 is connected to resistance VII 8 and resistance VIII 9, electric capacity III 12 is connected to the in-phase input end of resistance VIII 9 and amplifier 13, inverting input and the output terminal of amplifier 13 are connected in signal processor, the base stage of triode 2 is connected in single-chip microcomputer through resistance I 1.The square-wave signal that single-chip microcomputer sends is by triode 2 and stabilivolt 3, and making square-wave signal low level is triode 2 pressure drops, and square-wave signal high level is the voltage of stabilivolt 3, so the level voltage amplitude that single-chip microcomputer sends is accurate.Resistance VI 7, resistance VII 8 and the resistance VIII 9 of series connection form with the electric capacity I 10 being connected, electric capacity II 11, electric capacity III 12 the three rank low pass passive filters that formed by three capacitance-resistance charge-discharge circuits therebetween mutually, square-wave signal is converted to analog voltage signal, because the impedance of three capacitance-resistance charge-discharge circuits is larger, therefore by amplifier 13, improve load capacity, make its final reference voltage that produces output voltage effective value.
Claims (2)
1. an electric power output voltage Circuit tuning, it is characterized in that: comprise single-chip microcomputer, be connected in single-chip microcomputer numeric keypad and electric weight detection chip, be connected in active low-pass filter output terminal signal processor, be connected in the voltage feedback circuit of signal processor output terminal, described voltage feedback circuit output terminal is connected in the input end of electric weight detection chip, and the output terminal of described electric weight detection chip is connected in single-chip microcomputer.
2. electric power output voltage Circuit tuning according to claim 1, is characterized in that: described active same wave filter comprises triode (2), two ends are connected to the stabilivolt (3) of triode (2) emitter and collector, two resistance III (5) and resistance V (6) of mutually connecting, three resistance VI (7), resistance VII (8) and resistance VIII (9) of mutually connecting, amplifier (13), the resistance III (5) of described mutual series connection and resistance V (6) two ends are connected to triode (2) emitter and collector, described resistance III (5) is connected in power supply through resistance II (4), described resistance V (6) ground connection, the resistance VI (7) of described mutual series connection, resistance VII (8) and resistance VIII (9) one end be connected in triode (2) current collection extremely the other end be connected in the in-phase input end of amplifier (13), electric capacity I (10) is connected to resistance VI (7) and resistance VII (8), electric capacity II (11) is connected to resistance VII (8) and resistance VIII (9), electric capacity III (12) is connected to the in-phase input end of resistance VIII (9) and amplifier (13), inverting input and the output terminal of described amplifier (13) are connected in signal processor, the base stage of described triode (2) is connected in single-chip microcomputer through resistance I (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310539809.7A CN103558889A (en) | 2013-11-05 | 2013-11-05 | Power supply output voltage adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310539809.7A CN103558889A (en) | 2013-11-05 | 2013-11-05 | Power supply output voltage adjusting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103558889A true CN103558889A (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310539809.7A Pending CN103558889A (en) | 2013-11-05 | 2013-11-05 | Power supply output voltage adjusting circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514531A (en) * | 2003-07-03 | 2004-07-21 | 南京航空航天大学 | Voltage divider capacity voltage deviation feedforward control circuit of current control type semibridge transducer |
| US20120146596A1 (en) * | 2010-12-13 | 2012-06-14 | Hon Hai Precision Industry Co., Ltd. | Voltage converter |
| CN203535525U (en) * | 2013-11-05 | 2014-04-09 | 济南诺顿科技有限公司 | Power output voltage regulation circuit |
-
2013
- 2013-11-05 CN CN201310539809.7A patent/CN103558889A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514531A (en) * | 2003-07-03 | 2004-07-21 | 南京航空航天大学 | Voltage divider capacity voltage deviation feedforward control circuit of current control type semibridge transducer |
| US20120146596A1 (en) * | 2010-12-13 | 2012-06-14 | Hon Hai Precision Industry Co., Ltd. | Voltage converter |
| CN203535525U (en) * | 2013-11-05 | 2014-04-09 | 济南诺顿科技有限公司 | Power output voltage regulation circuit |
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Application publication date: 20140205 |