CN203967995U - A kind of controlled rectification D.C. regulated power supply - Google Patents
A kind of controlled rectification D.C. regulated power supply Download PDFInfo
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- CN203967995U CN203967995U CN201420394188.8U CN201420394188U CN203967995U CN 203967995 U CN203967995 U CN 203967995U CN 201420394188 U CN201420394188 U CN 201420394188U CN 203967995 U CN203967995 U CN 203967995U
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Abstract
A controlled rectification D.C. regulated power supply, comprises single chip machine controlling circuit, current rectifying and wave filtering circuit, DC/DC translation circuit, drive circuit, single-chip microcomputer 5V power circuit, current sampling circuit, voltage sample circuit, liquid crystal display circuit and operation push-button circuit.The utlity model has voltage output range wide, organize that voltage is default, overcurrent is set protection, short circuit recovers automatically, good in anti-interference performance more, the high and final output voltage of reliability with true show value accuracy compared with advantages of higher.
Description
Technical field
The present invention relates to D.C. regulated power supply field, especially a kind of controlled rectification D.C. regulated power supply.
Background technology
D.C. regulated power supply, as one of conventional instrument of electronic technology, is widely used in the research fields such as teaching and scientific research, and is that electronic experiment person, designer and circuit developing department carry out the requisite electronic instrument of test operation.The DC power supply of voltage stabilization is commonly used to power in electronic circuit.Whole voltage stabilizing process is comprised of transformer, rectification, filtering, voltage stabilizing four parts.But this traditional D.C. regulated power supply function is fairly simple, reliability again low, be difficult to control, disturb large, precision is lower, volume is large and complexity is high.The kind of common D.C. regulated power supply is varied, yet all there is following problem in them: (1) output voltage is to be that band switch and fine tuning are that potentiometer regulates with coarse adjustment, under these circumstances, when needs are exported accurate voltage, or while needing another to regulate among a small circle, difficulty is just higher; In addition, the increase in time of band switch and potentiometer, understands loose contact unavoidably, impact output.(2) voltage regulation way is all to adopt serial voltage regulation circuit, and overload is carried out to current limliting or current cutting off protection, and circuit is comparatively complicated, and the precision of voltage regulation is not high yet.
Summary of the invention
Technical problem to be solved by this invention is, a kind of controlled rectification D.C. regulated power supply that voltage output range is wide, organize the functions such as voltage is default, overcurrent is set protection, the automatic recovery of short circuit more that has is provided.
For solving the problems of the technologies described above, the invention provides a kind of controlled rectification D.C. regulated power supply, comprise single chip machine controlling circuit, current rectifying and wave filtering circuit, DC/DC translation circuit, drive circuit, single-chip microcomputer 5V power circuit, current sampling circuit, voltage sample circuit, liquid crystal display circuit and operation push-button circuit;
Single chip machine controlling circuit, changes output voltage and current value through inner A/D, compare with the output voltage of setting, and controls the pulsewidth that drives signal, to keep the stable of output voltage;
Current rectifying and wave filtering circuit, becomes alternating voltage the direct voltage of pulsation, after become level and smooth direct voltage;
DC/DC translation circuit, the direct voltage that current rectifying and wave filtering circuit is obtained carries out voltage stabilizing and obtains magnitude of voltage galvanic current pressure;
Drive circuit, connects single chip machine controlling circuit and DC/DC translation circuit, carries out conversion and the current drives of level;
Single-chip microcomputer 5V power circuit, for other circuit provide power supply;
Current sampling circuit, is divided into two-way by output current, and a road is sent to the current value of setting and compared; Liquid crystal display circuit demonstration real-time current is delivered to after sending single-chip microcomputer in one tunnel;
Voltage sample circuit, is divided into two-way by output voltage, and a road is sent to the magnitude of voltage of setting and compared; Liquid crystal display circuit demonstration real-time voltage is delivered to after sending single-chip microcomputer in one tunnel;
Liquid crystal display circuit, shows electric current, voltage parameter signal;
Operation push-button circuit, sets required output voltage values and protective current value, and is stored in single chip machine controlling circuit.
Single chip machine controlling circuit is selected STC12C5410AD single-chip microcomputer.Port resource is used and mainly contains: P1.4, P1.5, P1.6, P1.7, P2.0 pin are respectively used to the driving of Chinese liquid crystal display; P1.2 pin is for the A/D conversion of sample rate current, and P1.3 pin is for the A/D conversion of sampled voltage; P2.6, P2.7, P3.7 pin connect 3 switches, for power supply control operation; P3.5 pin output pulse width modulation signal, compares with sampled voltage, and comparative result is delivered to drive circuit TL494; P2.4 pin output pulse width modulation signal, compares with sample rate current, and comparative result is delivered to drive circuit TL494; P2.5 pin output step value send comparator and set point to superpose; P3.4 pin, for power-on protection, when start, does not power on drive circuit TL494.
The structure of current rectifying and wave filtering circuit, one end of protective tube FUSE connects power supply, and the other end connects capacitor C 21, and one end of resistance R 27 connects power supply, and the other end connects capacitor C 21, and power supply, protective tube FUSE, resistance R 27, capacitor C 21 form a loop; Capacitor C 21 connects one end of common mode inductance L1, and the other end of common mode inductance L1 connects one end of the rectifier bridge being comprised of diode D1, diode D2, diode D3, diode D4, and the other end of rectifier bridge connects the rear ground connection of capacitor C 2.
L1 is common mode inductance, inputs the alternating current of 220V from the input in left side, then via C21 and L1 filtering electromagnetic interference, then carries out rectification by rectifier bridge, and C2 carries out filtering, the direct currents of output more than 300 volts.
Drive circuit is selected PWM generator TL494.3 pin receive and to come from the pulse-width signal that voltage sampling circuit and current sampling circuit are sent here.When low level signal, TL494 goes out low level, and Q1 conducting makes Q2 obtain 15V voltage turn-on.When TL494 goes out high level, Q1 is obtained low level by, Q3 base stage, accelerates to turn-off the speed of Q2, has protective effect.
Voltage sample circuit, the in-phase input end of concatenation operation amplifier after four resistance R 22, resistance R 24, resistance R 25, resistance R 26 are in series, slide resistor R43 connects ground connection after the in-phase input end of operational amplifier; The inverting input of resistance R 20 concatenation operation amplifiers; The output connecting resistance R29 of operational amplifier.
Voltage after rectifying and wave-filtering step-down is added to the input of voltage sample circuit, by four series resistances, carry out dividing potential drop, slide rheostat R43 controls the voltage of in-phase input end by changing resistance value, because this structure is voltage follower, so output voltage equals input voltage.Output voltage is divided into two-way, and a road is sent to the magnitude of voltage of setting and made comparisons, and single-chip microcomputer is sent on a road, delivers to liquid crystal display again show this real-time voltage by single-chip microcomputer.
Current sampling circuit, the voltage after rectifying and wave-filtering step-down is added to the input of current sampling circuit, and current value is converted to magnitude of voltage, and single-chip microcomputer is delivered on output one tunnel, delivers to liquid crystal display again show by single-chip microcomputer; Comparator is delivered on one tunnel, compares with the protective current value of setting.Two wires can be drawn in circuit left side, connect powering load respectively at load two ends.
5 pins of liquid crystal display circuit, they are connected with the corresponding pin of single-chip microcomputer respectively.Wherein 8 pin are for receiving the serial clock signal that single-chip microcomputer is brought; 9 pin are for receiving the serial data signal that single-chip microcomputer is brought; The signal that 10 heels are sent here according to single-chip microcomputer selects to specify register; 11 pin carry out reset operation for receiving from the level signal of single-chip microcomputer; 12 pin are for sheet choosing.
Key circuit, key circuit adopts independently button.Button SW1 represents " _ ", and this button can reduce voltage or current value on the basis of given initial value, often presses once, and voltage reduces 0.1V or electric current reduces 0.01A, if pin, does not put, and can reduce continuously; Button SW2 represents "+", and this button can increase magnitude of voltage or current value on the basis of given initial value, often presses once, and voltage increases 0.1V or electric current increases 0.01A, if pin, does not put, and also can increase continuously; Button SW3 represents " setting ".After powering on to system, first by " setting " key assignments magnitude of voltage, with "+" " _ ", adjust up and down, until then acquisition desirable value is pressed " setting " key and is confirmed, and start the setting of current value, after current value sets, to press after the confirmation of " setting " key, system is started working.
Beneficial effect of the present invention is: voltage output range is wide; can complete the output of the voltage of variant amplitude between 0.0 ~ 40.0V; when setting output voltage values and protective current value; can manually often press "+" "-" key and carry out every 0.1V(0.01A once) big or small adjustment up and down; until obtain the numerical value needing, and common voltage value and protective current value can be stored in single-chip microcomputer.Many group voltage is default, overcurrent is set protection, short circuit recovers automatically, good in anti-interference performance, the high and final output voltage of reliability with true show value accuracy compared with advantages of higher.
Accompanying drawing explanation
Fig. 1 is system hardware theory diagram of the present invention.
Fig. 2 is STC12C5410AD chip structure figure of the present invention.
Fig. 3 is the structure chart of current rectifying and wave filtering circuit of the present invention.
Fig. 4 is the structure chart of drive circuit of the present invention.
Fig. 5 is the structure chart of voltage sample circuit of the present invention.
Fig. 6 is the structure chart of current sampling circuit of the present invention.
Fig. 7 is the structure chart of liquid crystal display circuit of the present invention.
Fig. 8 is the structure chart of key circuit of the present invention.
embodiment
For solving the problems of the technologies described above, the invention provides a kind of controlled rectification D.C. regulated power supply, comprise single chip machine controlling circuit, current rectifying and wave filtering circuit, DC/DC translation circuit, drive circuit, single-chip microcomputer 5V power circuit, current sampling circuit, voltage sample circuit, liquid crystal display circuit and operation push-button circuit;
Single chip machine controlling circuit, changes output voltage and current value through inner A/D, compare with the output voltage of setting, and controls the pulsewidth that drives signal, to keep the stable of output voltage;
Current rectifying and wave filtering circuit, becomes alternating voltage the direct voltage of pulsation, after become level and smooth direct voltage;
DC/DC translation circuit, the direct voltage that current rectifying and wave filtering circuit is obtained carries out voltage stabilizing and obtains magnitude of voltage galvanic current pressure;
Drive circuit, connects single chip machine controlling circuit and DC/DC translation circuit, carries out conversion and the current drives of level;
Single-chip microcomputer 5V power circuit, for other circuit provide power supply;
Current sampling circuit, is divided into two-way by output current, and a road is sent to the current value of setting and compared; Liquid crystal display circuit demonstration real-time current is delivered to after sending single-chip microcomputer in one tunnel;
Voltage sample circuit, is divided into two-way by output voltage, and a road is sent to the magnitude of voltage of setting and compared; Liquid crystal display circuit demonstration real-time voltage is delivered to after sending single-chip microcomputer in one tunnel;
Liquid crystal display circuit, shows electric current, voltage parameter signal;
Operation push-button circuit, sets required output voltage values and protective current value, and is stored in single chip machine controlling circuit.
As shown in Figure 1, the alternating voltage of 220V is down to needed magnitude of voltage through isolating transformer, then by rectification circuit, alternating voltage is become to the direct voltage of pulsation.Because the direct voltage of this pulsation also contains larger ripple, must be by addition filtering of filter circuit, thus obtain level and smooth direct voltage.But such voltage also changes with the variation of voltage ripple of power network, load and temperature.Thereby after rectification, filter circuit, also need to connect voltage stabilizing circuit.The effect of voltage stabilizing circuit is exactly when voltage ripple of power network, load and variations in temperature, maintains the stable of output dc voltage.In order to obtain our needed output voltage values and protective current value, can set and be stored in single-chip microcomputer by button.Single-chip microcomputer is changed output voltage meter current value through inner A/D, compare with the output voltage of setting, and controls the pulsewidth that drives signal, to keep the stable of output voltage.When surpassing protection set point, output current closes driving, with protection power source components and parts.The power supply of control loop is supplied with through wattage transformer by input power.
As shown in Figure 2, single chip machine controlling circuit is selected STC12C5410AD single-chip microcomputer.Port resource is used and mainly contains: P1.4, P1.5, P1.6, P1.7, P2.0 pin are respectively used to the driving of Chinese liquid crystal display; P1.2 pin is for the A/D conversion of sample rate current, and P1.3 pin is for the A/D conversion of sampled voltage; P2.6, P2.7, P3.7 pin connect 3 switches, for power supply control operation; P3.5 pin output pulse width modulation signal, compares with sampled voltage, and comparative result is delivered to drive circuit TL494; P2.4 pin output pulse width modulation signal, compares with sample rate current, and comparative result is delivered to drive circuit TL494; P2.5 pin output step value send comparator and set point to superpose; P3.4 pin, for power-on protection, when start, does not power on drive circuit TL494.
As shown in Figure 3, be the structure of current rectifying and wave filtering circuit.One end of protective tube FUSE connects power supply, and the other end connects capacitor C 21, and one end of resistance R 27 connects power supply, and the other end connects capacitor C 21, and power supply, protective tube FUSE, resistance R 27, capacitor C 21 form a loop; Capacitor C 21 connects one end of common mode inductance L1, and the other end of common mode inductance L1 connects one end of the rectifier bridge being comprised of diode D1, diode D2, diode D3, diode D4, and the other end of rectifier bridge connects the rear ground connection of capacitor C 2.
L1 is common mode inductance, inputs the alternating current of 220V from the input in left side, then via C21 and L1 filtering electromagnetic interference, then carries out rectification by rectifier bridge, and C2 carries out filtering, the direct currents of output more than 300 volts.
As shown in Figure 4, drive circuit is selected PWM generator TL494.3 pin receive and to come from the pulse-width signal that voltage sampling circuit and current sampling circuit are sent here.When low level signal, TL494 goes out low level, and Q1 conducting makes Q2 obtain 15V voltage turn-on.When TL494 goes out high level, Q1 is obtained low level by, Q3 base stage, accelerates to turn-off the speed of Q2, has protective effect.
As shown in Figure 5, be the structure of voltage sample circuit.The in-phase input end of concatenation operation amplifier after four resistance R 22, resistance R 24, resistance R 25, resistance R 26 are in series, slide resistor R43 connects ground connection after the in-phase input end of operational amplifier; The inverting input of resistance R 20 concatenation operation amplifiers; The output connecting resistance R29 of operational amplifier.
Voltage after rectifying and wave-filtering step-down is added to the input of voltage sample circuit, by four series resistances, carry out dividing potential drop, slide rheostat R43 controls the voltage of in-phase input end by changing resistance value, because this structure is voltage follower, so output voltage equals input voltage.Output voltage is divided into two-way, and a road is sent to the magnitude of voltage of setting and made comparisons, and single-chip microcomputer is sent on a road, delivers to liquid crystal display again show this real-time voltage by single-chip microcomputer.
As shown in Figure 6, be the structure of current sampling circuit.Voltage after rectifying and wave-filtering step-down is added to the input of current sampling circuit, and current value is converted to magnitude of voltage, and single-chip microcomputer is delivered on output one tunnel, delivers to liquid crystal display again show by single-chip microcomputer; Comparator is delivered on one tunnel, compares with the protective current value of setting.Two wires can be drawn in circuit left side, connect powering load respectively at load two ends.
As shown in Figure 7,5 pins of liquid crystal display circuit have mainly been used.They are connected with the corresponding pin of single-chip microcomputer respectively.Wherein 8 pin are for receiving the serial clock signal that single-chip microcomputer is brought; 9 pin are for receiving the serial data signal that single-chip microcomputer is brought; The signal that 10 heels are sent here according to single-chip microcomputer selects to specify register; 11 pin carry out reset operation for receiving from the level signal of single-chip microcomputer; 12 pin are for sheet choosing.
As shown in Figure 8, be the structure chart of key circuit.Key circuit adopts independently button.Button SW1 represents " _ ", and this button can reduce voltage or current value on the basis of given initial value, often presses once, and voltage reduces 0.1V or electric current reduces 0.01A, if pin, does not put, and can reduce continuously; Button SW2 represents "+", and this button can increase magnitude of voltage or current value on the basis of given initial value, often presses once, and voltage increases 0.1V or electric current increases 0.01A, if pin, does not put, and also can increase continuously; Button SW3 represents " setting ".After powering on to system, first by " setting " key assignments magnitude of voltage, with "+" " _ ", adjust up and down, until then acquisition desirable value is pressed " setting " key and is confirmed, and start the setting of current value, after current value sets, to press after the confirmation of " setting " key, system is started working.
Although the present invention illustrates with regard to preferred implementation and describes, only it will be understood by those of skill in the art that otherwise exceed claim limited range of the present invention, can carry out variations and modifications to the present invention.
Claims (8)
1. a controlled rectification D.C. regulated power supply, comprises single chip machine controlling circuit, current rectifying and wave filtering circuit, DC/DC translation circuit, drive circuit, single-chip microcomputer 5V power circuit, current sampling circuit, voltage sample circuit, liquid crystal display circuit and operation push-button circuit;
Single chip machine controlling circuit, changes output voltage and current value through inner A/D, compare with electric current with the output voltage of setting, and controls the pulsewidth that drives signal, to keep the stable of output voltage and electric current;
Current rectifying and wave filtering circuit, becomes alternating voltage the direct voltage of pulsation, after become level and smooth direct voltage;
DC/DC translation circuit, the direct voltage that current rectifying and wave filtering circuit is obtained carries out voltage stabilizing and obtains magnitude of voltage galvanic current pressure;
Drive circuit, connects single chip machine controlling circuit and DC/DC translation circuit, carries out conversion and the current drives of level;
Single-chip microcomputer 5V power circuit, for other circuit provide power supply;
Current sampling circuit, is divided into two-way by output current, and a road is sent to the current value of setting and compared; Liquid crystal display circuit demonstration real-time current is delivered to after sending single-chip microcomputer in one tunnel;
Voltage sample circuit, is divided into two-way by output voltage, and a road is sent to the magnitude of voltage of setting and compared; Liquid crystal display circuit demonstration real-time voltage is delivered to after sending single-chip microcomputer in one tunnel;
Liquid crystal display circuit, shows electric current, voltage parameter signal;
Operation push-button circuit, sets required output voltage values and protective current value, and is stored in single chip machine controlling circuit.
2. a kind of controlled rectification D.C. regulated power supply as claimed in claim 1, single chip machine controlling circuit is selected STC12C5410AD single-chip microcomputer, and port resource is used and mainly contains: P1.4, P1.5, P1.6, P1.7, P2.0 pin are respectively used to the driving of Chinese liquid crystal display; P1.2 pin is for the A/D conversion of sample rate current, and P1.3 pin is for the A/D conversion of sampled voltage; P2.6, P2.7, P3.7 pin connect 3 switches, for power supply control operation; P3.5 pin output pulse width modulation signal, compares with sampled voltage, and comparative result is delivered to drive circuit TL494; P2.4 pin output pulse width modulation signal, compares with sample rate current, and comparative result is delivered to drive circuit TL494; P2.5 pin output step value send comparator and set point to superpose; P3.4 pin, for power-on protection, when start, does not power on drive circuit TL494.
3. a kind of controlled rectification D.C. regulated power supply as claimed in claim 1, the concrete structure of current rectifying and wave filtering circuit is, one end of protective tube FUSE connects power supply, the other end connects capacitor C 21, one end of resistance R 27 connects power supply, the other end connects capacitor C 21, and power supply, protective tube FUSE, resistance R 27, capacitor C 21 form a loop; Capacitor C 21 connects one end of common mode inductance L1, and the other end of common mode inductance L1 connects one end of the rectifier bridge being comprised of diode D1, diode D2, diode D3, diode D4, and the other end of rectifier bridge connects the rear ground connection of capacitor C 2.
4. a kind of controlled rectification D.C. regulated power supply as claimed in claim 1, drive circuit is selected PWM generator TL494, and 3 pin receive and come from the pulse-width signal that voltage sampling circuit and current sampling circuit are sent here; When low level signal, TL494 goes out low level, and Q1 conducting makes Q2 obtain 15V voltage turn-on; When TL494 goes out high level, Q1 is obtained low level by, Q3 base stage, accelerates to turn-off the speed of Q2, has protective effect.
5. a kind of controlled rectification D.C. regulated power supply as claimed in claim 1, voltage sample circuit, the in-phase input end of concatenation operation amplifier after four resistance R 22, resistance R 24, resistance R 25, resistance R 26 are in series, slide resistor R43 connects ground connection after the in-phase input end of operational amplifier; The inverting input of resistance R 20 concatenation operation amplifiers; The output connecting resistance R29 of operational amplifier; Output voltage is divided into two-way, and a road is sent to the magnitude of voltage of setting and made comparisons, and single-chip microcomputer is sent on a road, delivers to liquid crystal display again show this real-time voltage by single-chip microcomputer.
6. a kind of controlled rectification D.C. regulated power supply as claimed in claim 1, current sampling circuit, the voltage after rectifying and wave-filtering step-down is added to the input of current sampling circuit, and current value is converted to magnitude of voltage, single-chip microcomputer is delivered on output one tunnel, delivers to liquid crystal display again show by single-chip microcomputer; Comparator is delivered on one tunnel, compares with the protective current value of setting; Two wires can be drawn in circuit left side, connect powering load respectively at load two ends.
7. a kind of controlled rectification D.C. regulated power supply as claimed in claim 1,5 pins of liquid crystal display circuit, they are connected with the corresponding pin of single-chip microcomputer respectively; Wherein 8 pin are for receiving the serial clock signal that single-chip microcomputer is brought; 9 pin are for receiving the serial data signal that single-chip microcomputer is brought; The signal that 10 heels are sent here according to single-chip microcomputer selects to specify register; 11 pin carry out reset operation for receiving from the level signal of single-chip microcomputer; 12 pin are for sheet choosing.
8. a kind of controlled rectification D.C. regulated power supply as claimed in claim 1, key circuit, key circuit adopts independently button; Button SW1 represents " _ ", and this button can reduce voltage or current value on the basis of given initial value, often presses once, and voltage reduces 0.1V or electric current reduces 0.01A, if pin, does not put, and can reduce continuously; Button SW2 represents "+", and this button can increase magnitude of voltage or current value on the basis of given initial value, often presses once, and voltage increases 0.1V or electric current increases 0.01A, if pin, does not put, and also can increase continuously; Button SW3 represents " setting "; After powering on to system, first by " setting " key assignments magnitude of voltage, with "+" " _ ", adjust up and down, until then acquisition desirable value is pressed " setting " key and is confirmed, and start the setting of current value, after current value sets, to press after the confirmation of " setting " key, system is started working.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105450012A (en) * | 2015-11-24 | 2016-03-30 | 深圳市思榕科技有限公司 | Consumer electronic product test power supply system |
| CN106527298A (en) * | 2016-12-29 | 2017-03-22 | 南宁职业技术学院 | Linear voltage-reduction numerical control power supply |
| CN106685234A (en) * | 2017-02-09 | 2017-05-17 | 百色学院 | Step-down direct current switch voltage-stabilized source and voltage stability control method |
| CN107546981A (en) * | 2017-09-01 | 2018-01-05 | 歌尔股份有限公司 | A kind of power circuit |
| CN108895956A (en) * | 2018-04-04 | 2018-11-27 | 成都众宜天成科技有限公司 | It is a kind of can straight cutting alternating current operation paint coating thickness measuring instrument |
| CN109449875A (en) * | 2018-11-07 | 2019-03-08 | 温州宝翔科技有限公司 | A kind of self- recoverage adjustable current protector |
| CN112040617A (en) * | 2020-07-31 | 2020-12-04 | 湖南一肯照明有限公司 | Lamp power supply voltage stabilization control circuit and method |
| CN113138102A (en) * | 2021-05-13 | 2021-07-20 | 黄河水利委员会黄河水利科学研究院 | Reservoir model test density flow sand content multipoint synchronous sampling device and control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105450012A (en) * | 2015-11-24 | 2016-03-30 | 深圳市思榕科技有限公司 | Consumer electronic product test power supply system |
| CN106527298A (en) * | 2016-12-29 | 2017-03-22 | 南宁职业技术学院 | Linear voltage-reduction numerical control power supply |
| CN106685234A (en) * | 2017-02-09 | 2017-05-17 | 百色学院 | Step-down direct current switch voltage-stabilized source and voltage stability control method |
| CN106685234B (en) * | 2017-02-09 | 2023-10-17 | 百色学院 | Voltage-reducing type direct-current switch voltage-stabilizing power supply and voltage-stabilizing control method |
| CN107546981A (en) * | 2017-09-01 | 2018-01-05 | 歌尔股份有限公司 | A kind of power circuit |
| CN107546981B (en) * | 2017-09-01 | 2019-11-29 | 歌尔股份有限公司 | A kind of power circuit |
| CN108895956A (en) * | 2018-04-04 | 2018-11-27 | 成都众宜天成科技有限公司 | It is a kind of can straight cutting alternating current operation paint coating thickness measuring instrument |
| CN109449875A (en) * | 2018-11-07 | 2019-03-08 | 温州宝翔科技有限公司 | A kind of self- recoverage adjustable current protector |
| CN112040617A (en) * | 2020-07-31 | 2020-12-04 | 湖南一肯照明有限公司 | Lamp power supply voltage stabilization control circuit and method |
| CN113138102A (en) * | 2021-05-13 | 2021-07-20 | 黄河水利委员会黄河水利科学研究院 | Reservoir model test density flow sand content multipoint synchronous sampling device and control system |
| CN113138102B (en) * | 2021-05-13 | 2024-01-30 | 黄河水利委员会黄河水利科学研究院 | Multi-point synchronous sampling device and control system for different-gravity-flow sand content of reservoir model test |
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