CN2572646Y - Small power switch power source circuit providing dc 5v and 24 v double-way isolation output - Google Patents
Small power switch power source circuit providing dc 5v and 24 v double-way isolation output Download PDFInfo
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- CN2572646Y CN2572646Y CN 02257461 CN02257461U CN2572646Y CN 2572646 Y CN2572646 Y CN 2572646Y CN 02257461 CN02257461 CN 02257461 CN 02257461 U CN02257461 U CN 02257461U CN 2572646 Y CN2572646 Y CN 2572646Y
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Abstract
The utility model relates to a small power switch power source circuit providing DC 5V and 24V double-way isolation output. A power supply inputted to a circuit is supplied to a main power supply of a main control circuit and a power supply of a charge circuit by rectification and wave filtering, the charge power supply is supplied to a power supply of the main control circuit by a voltage stabilizing circuit, and meanwhile, the charge power supply is supplied to a power supply of a charge battery by double-stage stabilizing voltage; the main control circuit converts DC voltage to square waves with different pulse widths by a field effect tube controlled by a pulse width modulation chip, the square waves is conveyed to a high frequency transformer, and is converted into DC output by voltage reduction, isolation and rectification; meanwhile, the utility model is provided with a feedback circuit, when the output voltage is increased, feedback voltage is increased, the main control circuit causes the output pulse width to narrow down, and the output voltage is decreased. In a similar way, when the output voltage is decreased, the output voltage is stabilized in a set value by the feedback circuit, which causes the output voltage to still more stabilize. If the main power supply powers down, the power supply can be supplied with a power by the battery, and the utility model can carry out power fail protection in the process of system starting and operation.
Description
Technical field
The utility model relates to a kind of power circuit, be meant a kind of small-power switching power-supply circuit that direct current 5V and the output of 24V dual path isolation are provided of industrial process automation control terminal especially, be a kind of employing inverse excitation type converter DC/DC, AC/DC high frequency switch power, be applicable in the control terminal in fields such as petrochemical industry, plumbing, electric power, metallurgy the small-power switching power-supply circuit that direct current 5V and 24V output are provided for master controller and other I/O modules.
Background technology
At present, along with development of electronic technology, the application of electronic system more and more widely, the kind of electronic equipment is also more and more, and is more versatile and flexible to the requirement of power supply.It is developing direction with light, thin, little and high efficiency that the miniaturization of electronic equipment and cost degradation make power supply.Be applied to industrial process automation field control appliance middle low power switching power circuit in China, the line design that has is too complicated, component number is many; And the power circuit that has design is too simple, mostly be single channel output greatly, weak point is that the element cost increases, circuit cost rises, the less stable of bulky, output, can not satisfy in the field control equipment needs for various control modules, input, output module and field instrument power supply.
Summary of the invention
The purpose of this utility model is to avoid above-mentioned weak point of the prior art and a kind of small-power switching power-supply circuit that the output of direct current 5V and 24V dual path isolation can be provided is provided, the small-power switching power-supply circuit of industry spot design, utilize modern power electronics technology, by the time ratio that the control switch transistor turns on and off, keep a kind of power circuit of regulated output voltage.AC (16～24VAC voltage source is connected to the AC/DC input) or DC input (14～40VDC voltage source is connected to the AC/DC input) are used in the power supply input; Provide direct current 5V/1A and 24V/0.5A output, by the state of diode displaying every road output; The charging voltage of 13.8V also is provided simultaneously, can uses the backup battery power supply; Adopted the switching technique of cold operation, transformer isolation, high-power and high-reliability; 5V, 24V output is isolated from each other and the input voltage part is also isolated; Main circuit adopts the single-ended flyback pulse width modulating technology, and (PWM, the energy that extracts from the input power supply keeps the average energy conversion with pulse width variations in a fixed cycle.) control mode.Main output is regulated by voltage feedback loop, uses transient protection diode and protective tube respectively overvoltage and overcurrent to be protected; Can require to be together in series use to the difference of power supply according to system.
The purpose of this utility model can reach by following measure:
A kind of small-power switching power-supply circuit that direct current 5V and the output of 24V dual path isolation are provided, this circuit is made up of power supply input circuit, charging circuit and master control, feedback, output circuit, and its concrete connecting circuit is constructed as follows:
Behind the external terminal AC/DC two ends shunt capacitance C23 of power supply input circuit, be connected on the ac input end 1 of electric bridge CR2,3, external terminal BATT+utmost point by diode CR1 connect electric bridge anode 2 and output V+, the negative pole of BATT meets the negative terminal 4 and the output V-of electric bridge, 2 of electric bridge, 4 two ends also meet piezo-resistance RV1, capacitor C 1, C2, output V-connects power supply ground, output V+ is by piezo-resistance RV3 in parallel, capacitor C 6 connects shell and master control, feedback, the respective point of output circuit and charging circuit, output V-meets power supply ground piezo-resistance RV2 in parallel with shell, capacitor C 4, the anode 2 of electric bridge passes through by resistance R 30, R31, capacitor C 14, voltage stabilizing didoe CR9, the voltage stabilizing circuit that field effect transistor Q1 forms inserts master control, feedback, 7 legs of output circuit U1;
The V+ of charging circuit inserts the respective point of master control, feedback, output circuit by resistance R 20, the V+ of charging circuit connects power supply ground by capacitor C 21, and by module U5, resistance R 27 and the two-stage three terminal regulator be made up of module U6, resistance R 24, R26, R28, capacitor C 22, its output connects the respective point of power supply input circuit by diode CR7, CR4;
Master control, feedback, output circuit:
Main control part: 1 leg of control chip U1 wherein is by parallel resistor R9, capacitor C 11 connects power supply ground, 2,5 legs connect power supply ground, 4,8 leg parallel resistance R8, separately by capacitor C 8, C10 connects power supply ground, 6 legs connect power supply ground by grid g and the resistance R 24 that resistance R 2 connects field effect transistor, 3 legs arrive power supply ground by capacitor C 3 and arrive the source S of field effect pipe by resistance R 6, the source S of field effect transistor arrives power supply ground by resistance R 1, the drain electrode d of field effect transistor connects the former limit winding and the capacitor C 7 by connecting of transformer, resistance R 3 is to power supply ground, the CPOMP end connects 2 legs of comparator U3A by resistance R 25,2 legs of comparator are by parallel resistor R11, capacitor C 12 connects power supply ground, 4 legs connect power supply ground, 1 leg connects the base stage of triode Q9, the collector electrode of triode Q9, emitter connects 8 of control chip respectively, 3 legs, 8 legs of control chip are by the resistance R 12 of series connection, R13 connects 1 leg of comparator, and 7 legs of control chip connect 8 legs of comparator, the collector electrode of triode Q9 and base stage parallel resistance R10;
Feedback fraction: the negative terminal of direct current output connects the negative terminal of adjustable voltage-stabiliser tube by resistance R 21, connect the input of optocoupler sheet simultaneously by resistance R 22, variable resistor R19, the resistance R 18 of series connection, the adjustment end of the adjustable voltage-stabiliser tube of variable termination of variable resistor R19, reach another input that connects the optocoupler sheet by capacitor C 15, resistance R 16, the R17 of series connection, the positive terminating resistor R16 of adjustable voltage-stabiliser tube, the tie point of R17, two input parallel resistance R15 of optocoupler sheet, one output termination power ground of optocoupler sheet, 1 leg of another termination control chip U1;
Output: behind the diode CR6 of the end of transformer secondary coil L1B by the forward connection, behind the low pass filter by inductance L 1, capacitor C 13, C17, C20 composition, insert the input of optocoupler sheet and resistance R 18, by insurance F1, voltage stabilizing didoe CR5, capacitor C 18, resistance R 23 by parallel connection form the positive output of direct current 5V, and the negative terminal of direct current 5V output connects power supply ground by capacitor C 9; Behind the diode CR10 of the end of transformer secondary coil L1C by the forward connection, shunt capacitance C19, behind insurance F2, shunt capacitance C16 forms direct current 24V output.
The utility model compared with prior art has following advantage:
The small-power switching power-supply circuit that the output of direct current 5V and 24V dual path isolation is provided provides direct current 5V and 24V output for master controller and other I/O module provide power supply, by the state of diode displaying every road output; A battery charger also is provided simultaneously, and when the voltage of main electricity was reduced to certain value, charger was started working, and charger can carry out trickle charge to the 12V electrolytic cell.If the main power source power down, this power module passes through powered battery.This of module feature can be carried out power down protection to your system in startup and running.This circuit has adopted the switching technique of cold operation, transformer isolation, high-power and high-reliability.5V, 24V output is isolated from each other and the input voltage part is also isolated.It has high frequency, highly reliable, low consumption, low noise, anti-interference characteristics such as strong, can also require to be together in series use to the difference of power supply according to system.Quick and easy for installation, be installed on the DIN guide rail of 7.5mm * 35mm, be connected on the system bus.Because what the utility model adopted all is technical grade unit, device, adaptable temperature is general encloses very extensively, is-40 ℃～60 ℃.Can work than under the rugged environment.
Description of drawings
Fig. 1. the calcspar of the small-power switching power-supply circuit of direct current 5V and 24V dual path isolation output is provided;
Fig. 2. the power supply input circuit of the small-power switching power-supply circuit of direct current 5V and 24V dual path isolation output is provided;
Fig. 3. the charging circuit of the small-power switching power-supply circuit of direct current 5V and 24V dual path isolation output is provided;
Fig. 4. master control, feedback, the output circuit of the small-power switching power-supply circuit of direct current 5V and 24V dual path isolation output are provided.
Embodiment
Please refer to Fig. 1 provides the calcspar of the small-power switching power-supply circuit of direct current 5V and the output of 24V dual path isolation, this circuit is made up of power supply input circuit, charging circuit and master control, feedback, output circuit, power supply input circuit provides power supply to master control, feedback, output circuit, simultaneously also can be to the battery charge of charging circuit, battery can be directly to master control, feedback, output circuit power supply when the power supply input circuit power down.
Now this circuit is merotomized by the function of its realization and describe.
Please refer to Fig. 2 provides the power supply input circuit of the small-power switching power-supply circuit of direct current 5V and the output of 24V dual path isolation, and this circuit can join with external power source and battery supply by external terminal, is this circuit supply.Insert by capacitor C 23 and electric bridge CR2 input current rectifying and wave filtering circuit in parallel at AC/DC voltage input two ends; Positive pole at BATT passes through a diode CR1, insert the output 2 of electric bridge CR2, an external voltage stabilizing circuit of forming by electric capacity, resistance, diode, field effect transistor of while, PDM keyer U1 power supply for main circuit, negative pole links to each other with electric bridge CR2 output 4, at 2,4 outputs of CR2 electric bridge two anti-series mode interference capacitor C 1, C2 and piezo-resistance RV1 in parallel, between the negative pole of BATT and shell ground, insert an anti-series mode interference capacitor C 4 and piezo-resistance RV2, connect shell ground at the positive pole of the BATT parallel circuits by C6 and RV3.
Please refer to Fig. 3 provides the charging circuit of the small-power switching power-supply circuit of direct current 5V and the output of 24V dual path isolation, its circuit is even formed the charging circuit of giving battery BATT at V+ end and BATT+ end by the utmost point of two three terminal regulators, the V+ termination is gone into the Vin end of three terminal regulator U5, Vout inserts the Vin of three terminal regulator U6 simultaneously by resistance R 27 and its ADJ end, the ADJ of three terminal regulator U6 inserts potentiometer R24, by regulator potentiometer, can carry out the battery charger calibration; Vout inserts BATT+ by CR7, finishes the charging to battery.
Please refer to Fig. 4. master control, feedback, the output circuit of the small-power switching power-supply circuit of direct current 5V and 24V dual path isolation output are provided, wherein:
Governor circuit: control chip (pulse width modulating technology PWM) U1, its 6 pin (output) is held grid by the g that a divider resistance R2 inserts mos field effect transistor MOSFET Q2, and the external RC network of its 1 pin (COMP) (being made up of resistance R 9, capacitor C 11) is used to improve the closed loop gain and the frequency effect of internal error amplifier; 5 pin GND connect power supply ground; 3 pin are the current detecting end; insert the S end source electrode of Q2 by a divider resistance R6; the capacitor C 7 that the d end drain electrode of Q2 links to each other can be eliminated the peak voltage of switching tube; the electric current that is used for the sense switch pipe, when 3 pin voltage 〉=1V, control chip U1 UC1843 just closes the output pulse; the protection switch pipe is unlikely to overcurrent to be damaged; between its 8 pin (Vref) and 4 pin (RT/CT), insert a resistance R 8, connect power supply ground by C8 and C10 electric capacity respectively in addition, determined the frequency of oscillation of oscillator.
Feedback circuit: this circuit provides a 5V reference feedback circuit, adjustable voltage-stabiliser tube U4 TL431 inserts a potentiometer R19, insert the input of optocoupler sheet U2 by several divider resistances, also insert the input of optocoupler sheet U2 simultaneously by the 5V output that secondary group produces around the limit of transformer T1B, the 1 pin COMP end of optocoupler sheet U2 output and control chip U1 joins.When output voltage increased, U4TL431 absorption current ability strengthened, and made optocoupler sheet primary current increase, and caused that feedback voltage V FB raises.
Output circuit: this power circuit output stage is that two-way is isolated output, and output adopts diode, electric capacity as output stage, meets the demands in order to make ripple coefficient of voltage, has added the low pass filter that one-level inductance, electric capacity are formed in the output circuit of 5V again; Also insert protective tube F1, F2 simultaneously and realize overcurrent protection, the transient protection diode is realized overvoltage protection; In the output circuit of 5V, insert a preload R23, constitute the loop, guarantee the stable of output voltage with this; Insert light-emitting diode DS1, DS2 and carry out the demonstration of voltage output state.
Below the utility model is done a step explanation.
16～24VAC voltage source or 14～40VDC voltage source are inserted by binding post in the circuit outside, be converted to direct current access master control, feedback, output circuit with overvoltage protection resistance with exchanging through anti-series mode interference electric capacity again by the filter circuit of being made up of electric capacity, electric bridge, 2 ends by electric bridge provide starting resistor through the voltage stabilizing circuit of being made up of electric capacity, resistance, field effect transistor and diode to control chip U1 UC1843 simultaneously; When external power source did not provide voltage, 2 ends of electric bridge CR2 LT420 were output as zero, diode CR1 IN5401 conducting, and its external connection battery positive pole, be this circuit supply by battery BATT this moment just.Simultaneously, when its external power supply operate as normal, also can connect and realize accumulators BATT charging by the utmost point of two voltage stabilizing circuits.Its course of work is by the field effect transistor MOSFET IRF530 that control chip U1 UC1843 controls direct voltage to be converted to the square wave with different pulse durations, is transported to high frequency transformer, is made into direct current output after step-down, isolation.The grid of 6 pin (output) the control field effect transistor MOSEFT IRF530 of control chip U1; The external RC network of 1 pin (COMP) of control chip U1 (being made up of resistance R 9, capacitor C 11) is used to improve the closed loop gain and the frequency effect of internal error amplifier; 3 pin are the current detecting end, are used for the electric current of sense switch pipe, and when 3 pin voltage 〉=1V, control chip U1 UC1843 just closes the output pulse, and the protection switch pipe is unlikely to overcurrent to be damaged, and the capacitor C 7 in parallel with switching tube can be eliminated the peak voltage of switching tube; Between its 8 pin (Vref) and 4 pin (RT/CT), insert a resistance R 8, connect power supply ground by C8 and C10 electric capacity respectively in addition, determined the frequency of oscillation of oscillator.This circuit provides a 5V reference feedback circuit, when output voltage increases, adjustable voltage-stabiliser tube U4 TL431 absorption current ability strengthens, make optocoupler sheet primary current increase, cause that feedback voltage V FB raises, the 2 pin voltages that are control chip U1 UC1843 raise, and output pulse width narrows down, and output voltage descends.In like manner, when output voltage reduces, also can make output voltage stabilization in set point by this feedback circuit.In addition can small adjustment output voltage amplitude by adjusting partial pressure potential device R19.Optocoupler sheet U2 also has buffer action at this.In above-mentioned feedback element, adjustable voltage-stabiliser tube U4 TL4311 samples to output voltage, supply with linear optical coupling sheet U2, be transferred to control chip U1 UC1843 again, pass through the error amplifier of chip, the latch of control chip then, the grid of control field effect transistor MOSFET IRF530, thereby the switching frequency of control transformer, in the primary coil of transformer, produce pulse current, by the secondary generation certain pulse voltage of induction, after rectification, filtering, just obtain required direct voltage at transformer.This power circuit output stage is that two-way is isolated output, and output adopts diode, electric capacity as output stage, meets the demands in order to make ripple coefficient of voltage, has added the low pass filter that one-level inductance, electric capacity are formed in the output circuit of 5V again; Also insert protective tube F1, F2 simultaneously and realize overcurrent protection, the transient protection diode is realized overvoltage protection; In the output circuit of 5V, insert a preload R23, constitute the loop, guarantee the stable of output voltage with this; Insert light-emitting diode DS1, DS2 and carry out the demonstration of voltage output state.
Provide the power supply input of the small-power switching power-supply circuit of direct current 5V and 24V dual path isolation output can use AC (16～24VAC voltage source is connected to the AC/DC input) or DC input (14～40VDC voltage source is connected to the AC/DC input).Be output as 5VDC/1A or 24VDC/0.5A, and can be used as 11～14VDC battery charger (200mA).Two-way output is isolated from each other, and the output of every road all has fuse.The state of diode displaying every road output.5V output is except also being connected with the I/O bus from terminal output.Be connected and 5V can be outputed on other module with the I/O bus.24V is only from terminal output, and the module of ask for something 24V power supply can equally also can be powered to the instrument of outside need 24V power supply from obtaining power supply here.This circuit has adopted the switching technique of cold operation, transformer isolation, high-power and high-reliability.5V, 24V output is isolated from each other and the input voltage part is also isolated.
This is used for the small-power switching power-supply circuit that direct current 5V and the output of 24V dual path isolation are provided of automation control appliance, made module, our factory's numbering and name are called E201 small-power switching power-supply module, this module adopts Type B box (115mm * 55mm) encapsulation, be installed on the DIN guide rail of 7.5mm * 35mm, be connected on the I/OBUS of the system bus.The power supply input of this module can be used AC (16～24VAC voltage source is connected to the AC/DC input) or DC input (14～40VDC voltage source is connected to the AC/DC input), adds that at its front end transformer inserts electrical network.Be output as 5VDC/1A or 24VDC/0.5A, and can be used as 11～14VDC battery charger (200mA).Two-way output is isolated from each other, and the output of every road all has fuse.The state of diode displaying every road output.5V output is except also being connected with the I/O bus from terminal output.Be connected and 5V can be outputed on other module with the I/O bus.24V is only from terminal output, and the module of ask for something 24V power supply can equally also can be powered to the instrument of outside need 24V power supply, for example 20mA closed-loop path transmitter from obtaining power supply here.E201 small-power switching power-supply module application is in various control equipment, link to each other with transformer, with the AC220V power source conversion is the DC power supply of DC24V, 0.5A or DC5V, 1A, by system bus is digital input/output module power supply, is analog quantity input/output module, display module and the power supply of part field instrument by binding post simultaneously.
According to parameter designing principle, the material selection principle of E201 small-power switching power-supply module, can not only realize small-power, high efficiency designing requirement, and circuit is realized easily, the ratio of performance to price is higher, volume is little, have bigger applied cost.The field shows, E201 small-power switching power-supply module has applying flexible, stable performance, reliability height, characteristics such as easy to install, and can be applicable to-40 ℃-60 ℃ ambient temperature, is applicable to open-air abominable industry spot environment.
Claims (1)
1. small-power switching power-supply circuit that the output of direct current 5V and 24V dual path isolation is provided, it is characterized in that: this circuit is made up of power supply input circuit, charging circuit and master control, feedback, output circuit, and its concrete connecting circuit is constructed as follows:
Behind the external terminal AC/DC two ends shunt capacitance C23 of power supply input circuit, be connected on the ac input end 1 of electric bridge CR2,3, external terminal BATT+utmost point by diode CR1 connect electric bridge anode 2 and output V+, the negative pole of BATT meets the negative terminal 4 and the output V-of electric bridge, 2 of electric bridge, 4 two ends also meet piezo-resistance RV1, capacitor C 1, C2, output V-connects power supply ground, output V+ is by piezo-resistance RV3 in parallel, capacitor C 6 connects shell and master control, feedback, the respective point of output circuit and charging circuit, output V-meets power supply ground piezo-resistance RV2 in parallel with shell, capacitor C 4, the anode 2 of electric bridge passes through by resistance R 30, R31, capacitor C 14, voltage stabilizing didoe CR9, the voltage stabilizing circuit that field effect transistor Q1 forms inserts master control, feedback, 7 legs of output circuit U1;
The V+ of charging circuit inserts the respective point of master control, feedback, output circuit by resistance R 20, the V+ of charging circuit connects power supply ground by capacitor C 21, and by module U5, resistance R 27 and the two-stage three terminal regulator be made up of module U6, resistance R 24, R26, R28, capacitor C 22, its output connects the respective point of power supply input circuit by diode CR7, CR4;
Master control, feedback, output circuit:
Main control part: 1 leg of control chip U1 wherein is by parallel resistor R9, capacitor C 11 connects power supply ground, 2,5 legs connect power supply ground, 4,8 leg parallel resistance R8, separately by capacitor C 8, C10 connects power supply ground, 6 legs connect power supply ground by grid g and the resistance R 24 that resistance R 2 connects field effect transistor, 3 legs arrive power supply ground by capacitor C 3 and arrive the source S of field effect pipe by resistance R 6, the source S of field effect transistor arrives power supply ground by resistance R 1, the drain electrode d of field effect transistor connects the former limit winding and the capacitor C 7 by connecting of transformer, resistance R 3 is to power supply ground, the CPOMP end connects 2 legs of comparator U3A by resistance R 25,2 legs of comparator are by parallel resistor R11, capacitor C 12 connects power supply ground, 4 legs connect power supply ground, 1 leg connects the base stage of triode Q9, the collector electrode of triode Q9, emitter connects 8 of control chip respectively, 3 legs, 8 legs of control chip are by the resistance R 12 of series connection, R13 connects 1 leg of comparator, and 7 legs of control chip connect 8 legs of comparator, the collector electrode of triode Q9 and base stage parallel resistance R10;
Feedback fraction: the negative terminal of direct current output connects the negative terminal of adjustable voltage-stabiliser tube by resistance R 21, connect the input of optocoupler sheet simultaneously by resistance R 22, variable resistor R19, the resistance R 18 of series connection, the adjustment end of the adjustable voltage-stabiliser tube of variable termination of variable resistor R19, reach another input that connects the optocoupler sheet by capacitor C 15, resistance R 16, the R17 of series connection, the positive terminating resistor R16 of adjustable voltage-stabiliser tube, the tie point of R17, two input parallel resistance R15 of optocoupler sheet, one output termination power ground of optocoupler sheet, 1 leg of another termination control chip U1;
Output: behind the diode CR6 of the end of transformer secondary coil L1B by the forward connection, behind the low pass filter by inductance L 1, capacitor C 13, C17, C20 composition, insert the input of optocoupler sheet and resistance R 18, by insurance F1, voltage stabilizing didoe CR5, capacitor C 18, resistance R 23 by parallel connection form the positive output of direct current 5V, and the negative terminal of direct current 5V output connects power supply ground by capacitor C 9; Behind the diode CR10 of the end of transformer secondary coil L1C by the forward connection, shunt capacitance C19, behind insurance F2, shunt capacitance C16 forms direct current 24V output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02257461 CN2572646Y (en) | 2002-09-26 | 2002-09-26 | Small power switch power source circuit providing dc 5v and 24 v double-way isolation output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02257461 CN2572646Y (en) | 2002-09-26 | 2002-09-26 | Small power switch power source circuit providing dc 5v and 24 v double-way isolation output |
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| CN2572646Y true CN2572646Y (en) | 2003-09-10 |
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| CN 02257461 Expired - Fee Related CN2572646Y (en) | 2002-09-26 | 2002-09-26 | Small power switch power source circuit providing dc 5v and 24 v double-way isolation output |
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| CN100382407C (en) * | 2005-07-27 | 2008-04-16 | 深圳市德先电子有限公司 | Multifunctional power adapter |
| CN101527529B (en) * | 2009-04-07 | 2010-10-27 | 杭州电子科技大学 | Water environment monitoring node power supply circuit based on solar energy power supply |
| WO2010148993A1 (en) * | 2009-06-24 | 2010-12-29 | 深圳市风发科技发展有限公司 | Voltage regulating method, device and system |
| CN102158092A (en) * | 2011-04-26 | 2011-08-17 | 武汉盛帆电子股份有限公司 | Three-phase buck type switch power supply module |
| CN102280900A (en) * | 2010-06-08 | 2011-12-14 | 上海金陵时威科技发展股份有限公司 | Low-power solar battery grid-connected power generation system |
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| WO2013037321A1 (en) * | 2011-09-15 | 2013-03-21 | 联正电子(深圳)有限公司 | A control method and system for assisting active power factor correction loads |
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| CN100382407C (en) * | 2005-07-27 | 2008-04-16 | 深圳市德先电子有限公司 | Multifunctional power adapter |
| CN101562346B (en) * | 2008-04-18 | 2012-07-25 | 深圳富泰宏精密工业有限公司 | Battery charging equipment |
| CN101527529B (en) * | 2009-04-07 | 2010-10-27 | 杭州电子科技大学 | Water environment monitoring node power supply circuit based on solar energy power supply |
| WO2010148993A1 (en) * | 2009-06-24 | 2010-12-29 | 深圳市风发科技发展有限公司 | Voltage regulating method, device and system |
| CN102280900A (en) * | 2010-06-08 | 2011-12-14 | 上海金陵时威科技发展股份有限公司 | Low-power solar battery grid-connected power generation system |
| CN102158092A (en) * | 2011-04-26 | 2011-08-17 | 武汉盛帆电子股份有限公司 | Three-phase buck type switch power supply module |
| CN102158092B (en) * | 2011-04-26 | 2013-09-11 | 武汉盛帆电子股份有限公司 | Three-phase buck type switch power supply module |
| WO2013037321A1 (en) * | 2011-09-15 | 2013-03-21 | 联正电子(深圳)有限公司 | A control method and system for assisting active power factor correction loads |
| CN105871040A (en) * | 2016-05-18 | 2016-08-17 | 深圳宝砾微电子有限公司 | AC (alternating current)-DC (direct current) flyback charging circuit and charger |
| CN106712514A (en) * | 2017-01-16 | 2017-05-24 | 郑艳燕 | Direct current (DC) voltage converting circuit |
| CN106712514B (en) * | 2017-01-16 | 2019-02-01 | 郑艳燕 | A kind of DC voltage conversion circuit |
| CN108683239A (en) * | 2018-08-04 | 2018-10-19 | 东莞市三敏电子科技有限公司 | A kind of USB charging circuits of electric intelligent household |
| CN108683239B (en) * | 2018-08-04 | 2024-02-23 | 东莞市三敏电子科技有限公司 | USB charging circuit of electric intelligent home |
| CN109116173A (en) * | 2018-09-12 | 2019-01-01 | 中车浦镇庞巴迪运输系统有限公司 | A kind of rail traffic vehicles ground detection device and detection method |
| CN109116173B (en) * | 2018-09-12 | 2023-09-12 | 中车浦镇阿尔斯通运输系统有限公司 | Rail transit vehicle grounding detection device and detection method |
| TWI738105B (en) * | 2019-11-04 | 2021-09-01 | 車王電子股份有限公司 | Power supply system |
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