CN205490211U - Miniwatt switching power supply circuit of multiplexed output - Google Patents
Miniwatt switching power supply circuit of multiplexed output Download PDFInfo
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- CN205490211U CN205490211U CN201620271655.7U CN201620271655U CN205490211U CN 205490211 U CN205490211 U CN 205490211U CN 201620271655 U CN201620271655 U CN 201620271655U CN 205490211 U CN205490211 U CN 205490211U
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Abstract
The utility model discloses a miniwatt switching power supply circuit of multiplexed output, including consecutive preceding stage protection circuit, rectifier circuit, peak current suppression circuit, switching transformer and high frequency rectification output circuit to and master control circuit, current detection circuit, voltage feedback circuit and reference voltage circuit, master control circuit links to each other with rectifier circuit, peak current suppression circuit, switching transformer, current detection circuit and voltage feedback circuit respectively, and reference voltage circuit links to each other with voltage feedback circuit and high frequency rectification output circuit respectively, and switching transformer is the multiplexed output, master control circuit passes through the switching element and links to each other with peak current suppression circuit for come firm output multichannel DC voltage and be used for realizing closed loop feedback control to the output voltage value through reference voltage circuit and voltage feedback circuit through the opening of control switch device, ratio between the turn -off time. Reach the operation of wide voltage, have output multichannel stabilizing the voltage's ability, can satisfy different voltage requirements.
Description
Technical field
This utility model relates to a kind of switching power circuit, particularly relates to the small-power switching power-supply circuit of a kind of multiple-channel output, belongs to switch power technology field.
Background technology
Alternating current is the energy the most frequently used in daily life, electric electronic current change technology and the development of switch power technology, Switching Power Supply is widely used as switching device compact based on self and the conversion efficiency high of alternating current in electronic product.
But, it is single that current Switching Power Supply still has output, it is impossible to meets life and the multiple requirement of industry, it is impossible to Width funtion runs, it is impossible to adapting to more occasion, load capacity is poor, the shortcomings such as production cost is high.
Utility model content
Main purpose of the present utility model is, overcomes deficiency of the prior art, it is provided that the small-power switching power-supply circuit of a kind of multiple-channel output, is particularly well-suited to the small-power electricity consumption place of various complexity.
Technical problem to be solved in the utility model is to provide the small-power switching power-supply circuit of easy, safe and reliable, the practical multiple-channel output of compact conformation, easy accessibility, making, can run with Width funtion, there is the ability of output multi-channel voltage, different voltage request can be met, and output voltage stabilization, cost is relatively low, has the value in industry.
In order to achieve the above object, this utility model be the technical scheme is that
A kind of small-power switching power-supply circuit of multiple-channel output; including the prime protection circuit being sequentially connected, rectification circuit, peak current suppression circuit, switch transformer and high-frequency rectification output circuit, and governor circuit, current detection circuit, voltage feedback circuit and reference voltage circuit；Described governor circuit is connected with rectification circuit, peak current suppression circuit, switch transformer, current detection circuit and voltage feedback circuit respectively, and described reference voltage circuit is connected with voltage feedback circuit and high-frequency rectification output circuit respectively.
Wherein, described switch transformer includes armature winding and the feedback winding being positioned at input side, is positioned at main output winding and time output winding of outlet side；The armature winding of described switch transformer is connected with the outfan of peak current suppression circuit, the feedback winding feedback of switch transformer is connected to governor circuit, and the magnitude of voltage that the main output winding of switch transformer exports through high-frequency rectification output circuit is connected with reference voltage circuit.
And; the input of described prime protection circuit is connected with alternating current; described governor circuit is connected with peak current suppression circuit by switching device, and governor circuit ratio between service time and the turn-off time by controlling switching device stablizes the DC voltage of output multi-channel and for the magnitude of voltage of output is realized closed loop feedback control by reference voltage circuit and voltage feedback circuit.
This utility model is further arranged to: described prime protection circuit include respectively with electric fuse and the critesistor of two outfans series windings of alternating current, the conjugation inductance being all in series with electric fuse and critesistor, and be conjugated the safety electric capacity that is in parallel of inductance.
This utility model is further arranged to: described rectification circuit is rectifier circuit, includes bridge rectifier and filter capacitor, and two inputs of described bridge rectifier are connected with the outfan of prime protection circuit, two outfans of bridge rectifier are connected with positive pole and the negative pole of filter capacitor respectively；The positive pole of described filter capacitor is connected with the input of peak current suppression circuit, the minus earth of filter capacitor.
This utility model is further arranged to: described peak current suppression circuit includes a RCD circuit and Transient Suppression Diode, and described RCD circuit in parallel is in the armature winding two ends of switch transformer；Described RCD circuit includes the RC parallel branch being in parallel by the first resistance and the first electric capacity, and the protection diode being in series with RC parallel branch；Described Transient Suppression Diode is in parallel with RC parallel branch；One end of described first resistance, one end of the first electric capacity are all connected with armature winding one end of switch transformer with the positive pole of Transient Suppression Diode, and the positive pole of described protection diode is connected with the armature winding other end of switch transformer.
This utility model is further arranged to: described switch transformer is three tunnel output transformators, and the main output winding and time output winding that are positioned at outlet side are respectively two-way output and road output.
This utility model is further arranged to: if described high-frequency rectification output circuit includes the rectification unit of the identical structure in main line being connected respectively with every road output of switch transformer outlet side, described rectification unit includes output rectification circuit, π type filter circuit and DCR circuit.
Wherein, described output rectification circuit includes Schottky diode, the second resistance and the second electric capacity, is connected in parallel on the two ends of Schottky diode after described second resistance and the second capacitances in series；Described π type filter circuit includes that the 3rd electric capacity, the first inductance and the 4th electric capacity being sequentially connected in series, described DCR circuit include the first diode, ceramic disc capacitor and the 3rd resistance in parallel successively；Described one end of first inductance is connected with the negative pole of Schottky diode, and the other end of the first inductance and the negative pole of the first diode are connected；The equal ground connection of positive pole of negative pole, the negative pole of the 4th electric capacity and first diode of described 3rd electric capacity.
This utility model is further arranged to: described governor circuit includes that UC3842 chip, described switching device are N-MOS pipe.
Wherein, the 4th resistance and commutation diode that the feeder ear of described UC3842 chip is sequentially connected in series by starting resistance and be connected with the outfan of rectification circuit and pass through start-up capacitance ground connection and passing through are connected with the feedback winding of switch transformer, the minus earth of described start-up capacitance, the negative pole of described commutation diode and the 4th resistance are connected；
Wherein, the feedback voltage input of described UC3842 chip is connected with the outfan of voltage feedback circuit, and the feedback current input of UC3842 chip is connected with the source electrode of N-MOS pipe by current detection circuit；The drain electrode of described N-MOS pipe is connected with peak current suppression circuit, and the grid of N-MOS pipe is connected with the outfan of recommending of UC3842 chip by the second diode；The positive pole of described second diode is connected with the grid of N-MOS pipe, and the both sides of the second diode are parallel with the 5th resistance, and the positive pole of the second diode is connected with the earth terminal of UC3842 chip by the 6th resistance.
This utility model is further arranged to: described current detection circuit includes the 7th resistance and the 8th resistance being sequentially connected, one end of described 7th resistance is connected with governor circuit, the other end of the 7th resistance and one end of the 8th resistance are all connected with switching device, the other end ground connection of described 8th resistance.
This utility model is further arranged to: described voltage feedback circuit includes photoelectrical coupler, one input of described photoelectrical coupler is connected with the outfan of reference voltage circuit by the 9th resistance and the 5th capacity earth, another input being sequentially connected in series, and is parallel with the 6th electric capacity between two outfans of described photoelectrical coupler.
This utility model is further arranged to: described reference voltage circuit includes TL431, the negative electrode of described TL431 is connected with voltage feedback circuit and the tenth resistance, the 7th electric capacity and the 11st resistance that pass through to be sequentially connected are connected with the magnitude of voltage of output, the plus earth of described TL431 is also connected by the input of adjustable resistance and the 11st resistance, and the reference edge of described TL431 is connected with the adjustable side of adjustable resistance.
Compared with prior art, this utility model has the beneficial effect that
By prime protection circuit, rectification circuit, peak current suppression circuit, switch transformer and high-frequency rectification output circuit; and the setting of governor circuit, current detection circuit, voltage feedback circuit and reference voltage circuit; wherein switch transformer includes armature winding and feedback winding, the main output winding being positioned at outlet side and the secondary output winding being positioned at input side, it is provided that the switch transformer of multichannel DC-DC voltage transformation；And the DC voltage of output multi-channel is stablized by the ratio between service time and the turn-off time of governor circuit control switching device, and the magnitude of voltage of output is realized closed loop feedback control by reference voltage circuit and voltage feedback circuit, can run with Width funtion, there is the ability of output multi-channel voltage, thus different voltage request can be met, it is ensured that output voltage stabilization.
Foregoing is only the general introduction of technical solutions of the utility model, and in order to be better understood upon technological means of the present utility model, the utility model will be further described below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the small-power switching power-supply circuit of a kind of multiple-channel output of this utility model；
Fig. 2 be a kind of multiple-channel output of this utility model small-power switching power-supply circuit in prime protection circuit and the circuit diagram of rectification circuit；
Fig. 3 be a kind of multiple-channel output of this utility model small-power switching power-supply circuit in peak current suppression circuit and the circuit diagram of switch transformer；
Fig. 4 is the circuit diagram of the small-power switching power-supply circuit breaker in middle transformator of a kind of multiple-channel output of this utility model；
Fig. 5 is small-power switching power-supply circuit breaker in middle transformator and the circuit diagram of high-frequency rectification output circuit of a kind of multiple-channel output of this utility model；
Fig. 6 be a kind of multiple-channel output of this utility model small-power switching power-supply circuit in governor circuit and the circuit diagram of current detection circuit；
Fig. 7 be a kind of multiple-channel output of this utility model small-power switching power-supply circuit in voltage feedback circuit and the circuit diagram of reference voltage circuit.
Detailed description of the invention
Below in conjunction with Figure of description, this utility model is further described.
The small-power switching power-supply circuit of a kind of multiple-channel output as shown in Figure 1; including the prime protection circuit 1 being sequentially connected, rectification circuit 2, peak current suppression circuit 3, switch transformer U1 and high-frequency rectification output circuit 4, and governor circuit 5, current detection circuit 6, voltage feedback circuit 7 and reference voltage circuit 8；Described governor circuit 5 is connected with rectification circuit 2, peak current suppression circuit 3, switch transformer U1, current detection circuit 6 and voltage feedback circuit 7 respectively, and described reference voltage circuit 8 is connected with voltage feedback circuit 7 and high-frequency rectification output circuit 4 respectively.
As shown in Figure 1 and Figure 4, described switch transformer U1 includes armature winding (0,1 tap) and feedback winding (2,3 tap) being positioned at input side, is positioned at main output winding (6,7,8 tap) and time output winding (4,5 tap) of outlet side；The armature winding of described switch transformer U1 is connected with the outfan of peak current suppression circuit 3, the feedback winding feedback of switch transformer U1 is connected to governor circuit 5, and the magnitude of voltage that the main output winding of switch transformer U1 exports through high-frequency rectification output circuit 4 is connected with reference voltage circuit 8.
As shown in Figure 1; the input of described prime protection circuit 1 is connected with alternating current; described governor circuit 5 is connected with peak current suppression circuit 3 by switching device K1, and the governor circuit 5 ratio between service time and the turn-off time by controlling switching device K1 stablizes the DC voltage of output multi-channel and for the magnitude of voltage of output is realized closed loop feedback control by reference voltage circuit 8 and voltage feedback circuit 7.
As shown in Figure 2; described prime protection circuit 1 include respectively with alternating current two outfans series winding electric fuse fuse1 and critesistor R5; the conjugation inductance L1 being all in series with electric fuse fuse1 and critesistor R5, and the safety electric capacity C1 being in parallel with conjugation inductance L1；Can prevent prime from the basic circuit problems such as short-circuit overload occurring, and electromagnetic interference can be suppressed, prevent the electromagnetism channelling in power supply from entering electrical network.
As shown in Figure 2; described rectification circuit 2 is rectifier circuit, includes bridge rectifier and filter capacitor C7, and two inputs of described bridge rectifier are connected with the outfan of prime protection circuit 1, two outfans of bridge rectifier are connected with positive pole and the negative pole of filter capacitor C7 respectively；The positive pole of described filter capacitor C7 is connected with the input of peak current suppression circuit 3, the minus earth of filter capacitor C7.
As it is shown on figure 3, described peak current suppression circuit 3 includes a RCD circuit and Transient Suppression Diode D2, described RCD circuit in parallel is in the armature winding two ends of switch transformer U1；Described RCD circuit includes the RC parallel branch in parallel by the first resistance R2 and the first electric capacity phase C6, and the protection diode D4 being in series with RC parallel branch；Described Transient Suppression Diode D2 and RC parallel branch is in parallel；One end of described first resistance R2, one end of the first electric capacity C6 are all connected with armature winding one end of switch transformer U1 with the positive pole of Transient Suppression Diode D2, and the described positive pole of protection diode D4 is connected with the armature winding other end of switch transformer U1.Owing to Switching Power Supply switching device in the course of the work can open shutoff frequently, in circuit, the existence of electric capacity and inductance can produce surge voltage and noise, the existence of surge voltage and noise not only have impact on quality and the stability of power supply output, and be there is the biggest injury in component, so add a peak current suppression circuit 3 in the armature winding side of switch transformer, it can be ensured that the stability of output voltage.
As shown in Figure 3 and Figure 4, described switch transformer U1 is three tunnel output transformators, and the main output winding (6,7,8 tap) and time output winding (4,5 tap) that are positioned at outlet side are respectively two-way output and road output；And secondary output winding is separate with main output winding.Wherein, No. 6 of switch transformer U1 and No. 7 taps are a road output, and No. 7 of switch transformer U1 and No. 8 taps are that a road exports；No. 7 taps are reference voltage the non-zero level of positive-negative power, and it is connected with the negative terminal of TL431 by associated electronic components.
In the present embodiment, the unidirectional current of the 6 of switch transformer U1,7, the 8 exportable positive and negative 12V of tap, the unidirectional current of 4, the 5 exportable positive 5V of tap；5V unidirectional current independently exports, not with other output common grounds.Wherein the winding process of switch transformer U1 is: first around armature winding, and winding is first to start with diameter 0.3mm enamel-covered wire around 36 circles from 1 foot (i.e. tap), terminates on 0 foot the most again；Further around making main output winding, winding starts, after 6 circles, to terminate on 7 feet from 8 feet with 2 diameter 0.8mm；Carry out insulation processing further around 6 circles are same plus two-layer high temperature gummed tape, 6 feet terminate；Then coiling secondary windings, the enamel-covered wire of winding diameter 0.8mm starts to return to 4 feet around 4 circles from 5 feet and has terminated time output winding technique.Last coiling feedback winding, the enamel-covered wire of winding diameter 0.8mm returns to 3 feet from 2 feet around 7 circles to be terminated.
As it is shown in figure 5, if described high-frequency rectification output circuit 4 includes the rectification unit of the identical structure in main line being connected respectively with every road output of switch transformer U1 outlet side, described rectification unit includes output rectification circuit 41, π type filter circuit 42 and DCR circuit 43.
Wherein, rectification unit is as a example by 5V single channel exports.Described output rectification circuit 41 includes Schottky diode SR3, the second resistance R10 and the second electric capacity C16, is connected in parallel on the two ends of Schottky diode SR3 after described second resistance R10 and the second electric capacity C16 series connection；Described π type filter circuit 42 includes the 3rd electric capacity C13, the first inductance L3 and the 4th electric capacity C14 being sequentially connected in series, and described DCR circuit 43 includes the first diode D5, ceramic disc capacitor C15 and the 3rd resistance R9 in parallel successively；Described one end of first inductance L3 is connected with the negative pole of Schottky diode SR3, and the other end of the first inductance L3 and the negative pole of the first diode D5 are connected；The equal ground connection of positive pole of negative pole, the negative pole of the 4th electric capacity C14 and the first diode D5 of described 3rd electric capacity C13.
As shown in Figure 6, described governor circuit 5 includes that UC3842 chip U2, described switching device K1 are N-MOS pipe.
Wherein, the feeder ear (pin 7) of described UC3842 chip U2 is by starting resistance R1 and be connected with the outfan of rectification circuit 2 and pass through start-up capacitance C12 ground connection and passing through the feedback winding T3 of the 4th resistance R14 and commutation diode D7 and the switch transformer U1 being sequentially connected in series and be connected, the minus earth of described start-up capacitance C12, the negative pole of described commutation diode D7 and the 4th resistance R14 are connected；The feedback voltage input (pin 1) of described UC3842 chip U2 is connected with the outfan of voltage feedback circuit 7, and the feedback current input (pin 3) of UC3842 chip U2 is connected with the source electrode D end of N-MOS pipe by current detection circuit 6；The drain electrode S end of described N-MOS pipe is connected with peak current suppression circuit 3, and the grid of N-MOS pipe is connected by the outfan (pin 6) of recommending of the second diode D6 and UC3842 chip U2；The described positive pole of the second diode D6 is connected with the grid of N-MOS pipe, and the both sides of the second diode D6 are parallel with the 5th resistance R11, and the positive pole of the second diode D6 is connected by the earth terminal (pin 5) of the 6th resistance R15 and UC3842 chip U2.
As shown in Figure 6, described current detection circuit 6 includes the 7th resistance R13 and the 8th resistance R18 being sequentially connected, one end of described 7th resistance R13 is connected with governor circuit 5, the other end of the 7th resistance R13 and one end of the 8th resistance R18 are all connected with switching device, the other end ground connection of described 8th resistance R18.
As shown in Figure 7, described voltage feedback circuit 7 includes photoelectrical coupler PC1, one input of described photoelectrical coupler PC1 is connected with the outfan of reference voltage circuit 8 by the 9th resistance R17 and the 5th electric capacity C18 ground connection, another input being sequentially connected in series, and is parallel with the 6th electric capacity C21 between two outfans of described photoelectrical coupler PC1.
As shown in Figure 7, described reference voltage circuit 8 includes TL431, the negative electrode of described TL431 is connected with voltage feedback circuit 7 and the tenth resistance R16, the 7th electric capacity C20 and the 11st resistance R12 that pass through to be sequentially connected are connected with the magnitude of voltage of output, the plus earth of described TL431 is also connected by the input of adjustable resistance RW and the 11st resistance R12, and the reference edge of described TL431 is connected with the adjustable side of adjustable resistance RW.
This utility model provides switching power circuit based on UC3842 chip, it it is the switching power circuit of a kind of multi output, to output voltage direct sample, send voltage signal to governor circuit 5 after being processed by output voltage, have and export positive 12V direct current and negative 12V direct current and export the ability of independent 5V direct current.The UC3842 chip wherein used is high-performance Single-end output formula current control mode pulse width modulator chip.
Input/output procedure is: the alternating voltage in the range of input 86V～265V; alternating current is through prime protection circuit; again through rectifier bridge rectification be unidirectional current; the unidirectional current that voltage is higher carries out DC-DC voltage transformation by switch transformer; switch transformer main winding side connects a switching device controlled by PWM ripple; exporting through high-frequency rectification circuit rectifying and wave-filtering of secondary output; the magnitude of voltage of output is through reference voltage circuit based on TL431, and secondary voltage signal is fed back to the governor circuit of main by the voltage feedback circuit consisted of photoelectrical coupler；Governor circuit changes the dutycycle of the PWM ripple controlling switching device by the voltage signal fed back and current signal.Realized the adjustment of magnitude of voltage is reached constant output by the governor circuit that UC3842 chip is core during whole.
The above, it it is only preferred embodiment of the present utility model, not this utility model is made any pro forma restriction, although this utility model is disclosed above with preferred embodiment, but it is not limited to this utility model, any those skilled in the art, in the range of without departing from technical solutions of the utility model, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is the content without departing from technical solutions of the utility model, any simple modification above example made according to technical spirit of the present utility model, equivalent variations and modification, all still fall within the range of technical solutions of the utility model.
Claims (10)
1. the small-power switching power-supply circuit of a multiple-channel output; it is characterized in that: include prime protection circuit, rectification circuit, peak current suppression circuit, switch transformer and the high-frequency rectification output circuit being sequentially connected, and governor circuit, current detection circuit, voltage feedback circuit and reference voltage circuit；Described governor circuit is connected with rectification circuit, peak current suppression circuit, switch transformer, current detection circuit and voltage feedback circuit respectively, and described reference voltage circuit is connected with voltage feedback circuit and high-frequency rectification output circuit respectively；
Described switch transformer includes armature winding and the feedback winding being positioned at input side, is positioned at main output winding and time output winding of outlet side；The armature winding of described switch transformer is connected with the outfan of peak current suppression circuit, the feedback winding feedback of switch transformer is connected to governor circuit, and the magnitude of voltage that the main output winding of switch transformer exports through high-frequency rectification output circuit is connected with reference voltage circuit；
The input of described prime protection circuit is connected with alternating current; described governor circuit is connected with peak current suppression circuit by switching device, and governor circuit ratio between service time and the turn-off time by controlling switching device stablizes the DC voltage of output multi-channel and for the magnitude of voltage of output is realized closed loop feedback control by reference voltage circuit and voltage feedback circuit.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1; it is characterized in that: described prime protection circuit include respectively with alternating current two outfans series winding electric fuse and critesistor; the conjugation inductance being all in series with electric fuse and critesistor, and the safety electric capacity being in parallel with conjugation inductance.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1; it is characterized in that: described rectification circuit is rectifier circuit, includes bridge rectifier and filter capacitor, two inputs of described bridge rectifier are connected with the outfan of prime protection circuit, two outfans of bridge rectifier are connected with positive pole and the negative pole of filter capacitor respectively；The positive pole of described filter capacitor is connected with the input of peak current suppression circuit, the minus earth of filter capacitor.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1, it is characterised in that: described peak current suppression circuit includes a RCD circuit and Transient Suppression Diode, and described RCD circuit in parallel is in the armature winding two ends of switch transformer；Described RCD circuit includes the RC parallel branch being in parallel by the first resistance and the first electric capacity, and the protection diode being in series with RC parallel branch；Described Transient Suppression Diode is in parallel with RC parallel branch；One end of described first resistance, one end of the first electric capacity are all connected with armature winding one end of switch transformer with the positive pole of Transient Suppression Diode, and the positive pole of described protection diode is connected with the armature winding other end of switch transformer.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1, it is characterised in that: described switch transformer is three tunnel output transformators, and the main output winding and time output winding that are positioned at outlet side are respectively two-way output and road output.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1, it is characterized in that: if described high-frequency rectification output circuit includes the rectification unit of the identical structure in main line being connected respectively with every road output of switch transformer outlet side, described rectification unit includes output rectification circuit, π type filter circuit and DCR circuit；
Described output rectification circuit includes Schottky diode, the second resistance and the second electric capacity, is connected in parallel on the two ends of Schottky diode after described second resistance and the second capacitances in series；Described π type filter circuit includes that the 3rd electric capacity, the first inductance and the 4th electric capacity being sequentially connected in series, described DCR circuit include the first diode, ceramic disc capacitor and the 3rd resistance in parallel successively；
Described one end of first inductance is connected with the negative pole of Schottky diode, and the other end of the first inductance and the negative pole of the first diode are connected；The equal ground connection of positive pole of negative pole, the negative pole of the 4th electric capacity and first diode of described 3rd electric capacity.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1, it is characterised in that: described governor circuit includes that UC3842 chip, described switching device are N-MOS pipe；
The 4th resistance and commutation diode that the feeder ear of described UC3842 chip is sequentially connected in series by starting resistance and be connected with the outfan of rectification circuit and pass through start-up capacitance ground connection and passing through are connected with the feedback winding of switch transformer, the minus earth of described start-up capacitance, the negative pole of described commutation diode and the 4th resistance are connected；
The feedback voltage input of described UC3842 chip is connected with the outfan of voltage feedback circuit, and the feedback current input of UC3842 chip is connected with the source electrode of N-MOS pipe by current detection circuit；The drain electrode of described N-MOS pipe is connected with peak current suppression circuit, and the grid of N-MOS pipe is connected with the outfan of recommending of UC3842 chip by the second diode；The positive pole of described second diode is connected with the grid of N-MOS pipe, and the both sides of the second diode are parallel with the 5th resistance, and the positive pole of the second diode is connected with the earth terminal of UC3842 chip by the 6th resistance.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1, it is characterized in that: described current detection circuit includes the 7th resistance and the 8th resistance being sequentially connected, one end of described 7th resistance is connected with governor circuit, the other end of the 7th resistance and one end of the 8th resistance are all connected with switching device, the other end ground connection of described 8th resistance.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1, it is characterized in that: described voltage feedback circuit includes photoelectrical coupler, one input of described photoelectrical coupler is connected with the outfan of reference voltage circuit by the 9th resistance and the 5th capacity earth, another input being sequentially connected in series, and is parallel with the 6th electric capacity between two outfans of described photoelectrical coupler.
The small-power switching power-supply circuit of a kind of multiple-channel output the most according to claim 1, it is characterized in that: described reference voltage circuit includes TL431, the negative electrode of described TL431 is connected with voltage feedback circuit and the tenth resistance, the 7th electric capacity and the 11st resistance that pass through to be sequentially connected are connected with the magnitude of voltage of output, the plus earth of described TL431 is also connected by the input of adjustable resistance and the 11st resistance, and the reference edge of described TL431 is connected with the adjustable side of adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620271655.7U CN205490211U (en) | 2016-04-01 | 2016-04-01 | Miniwatt switching power supply circuit of multiplexed output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620271655.7U CN205490211U (en) | 2016-04-01 | 2016-04-01 | Miniwatt switching power supply circuit of multiplexed output |
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| Publication Number | Publication Date |
|---|---|
| CN205490211U true CN205490211U (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620271655.7U Expired - Fee Related CN205490211U (en) | 2016-04-01 | 2016-04-01 | Miniwatt switching power supply circuit of multiplexed output |
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| CN (1) | CN205490211U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365765A (en) * | 2018-03-30 | 2018-08-03 | 上海理工大学 | A kind of multiple-channel output single-end flyback switching power supply |
| CN108768179A (en) * | 2018-07-20 | 2018-11-06 | 珠海格力电器股份有限公司 | Switching power circuit, driving plate and convertible frequency air-conditioner |
| TWI745411B (en) * | 2016-12-12 | 2021-11-11 | 伍德 約翰 | Active full bridge rectifier with interrupter switch |
-
2016
- 2016-04-01 CN CN201620271655.7U patent/CN205490211U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI745411B (en) * | 2016-12-12 | 2021-11-11 | 伍德 約翰 | Active full bridge rectifier with interrupter switch |
| CN108365765A (en) * | 2018-03-30 | 2018-08-03 | 上海理工大学 | A kind of multiple-channel output single-end flyback switching power supply |
| CN108768179A (en) * | 2018-07-20 | 2018-11-06 | 珠海格力电器股份有限公司 | Switching power circuit, driving plate and convertible frequency air-conditioner |
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Granted publication date: 20160817 Termination date: 20200401 |