CN208707543U - Switching Power Supply with overcurrent protection Self-resetting - Google Patents

Switching Power Supply with overcurrent protection Self-resetting Download PDF

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Publication number
CN208707543U
CN208707543U CN201820976810.4U CN201820976810U CN208707543U CN 208707543 U CN208707543 U CN 208707543U CN 201820976810 U CN201820976810 U CN 201820976810U CN 208707543 U CN208707543 U CN 208707543U
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CN
China
Prior art keywords
circuit
filter
high frequency
frequency transformer
power supply
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Expired - Fee Related
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CN201820976810.4U
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Chinese (zh)
Inventor
袁梦琪
崔渊
俞洋
王云松
黄成�
薛波
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Jiangsu University of Technology
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Jiangsu University of Technology
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Abstract

The utility model provides a kind of Switching Power Supply with overcurrent protection Self-resetting, comprising: input rectifying filter circuit, input rectifying filter circuit are connected with AC power source;Power switch tube and high frequency transformer circuit, power switch tube and high frequency transformer circuit are connected with input rectifying filter circuit;Output rectifier and filter, output rectifier and filter are connected with power switch tube and high frequency transformer circuit;Feed circuit, feed circuit are connected with output rectifier and filter;Circuit is protected, protection circuit is connected with output rectifier and filter;Control circuit; control circuit is connected with power switch tube and high frequency transformer circuit, feed circuit and protection circuit respectively; the output DC voltage for the output rectifier and filter that control circuit is fed back according to feed circuit controls power switch tube and high frequency transformer circuit to realize pressure stabilizing, and according to the actuating of relay inside the protection instruction and reset instruction control of protection circuit evolving to realize overcurrent protection and Self-resetting respectively.

Description

Switching Power Supply with overcurrent protection Self-resetting
Technical field
The utility model relates to switch power technology fields, and in particular to a kind of switch electricity with overcurrent protection Self-resetting Source.
Background technique
With the high speed development of countries in the world electronic science and technology, the application of Switching Power Supply is increasingly by the weight of people Depending on Switching Power Supply is gradually applied to the every field of social development.Since the input voltage of Switching Power Supply is usually very high, Ren Yuan Security risk has been easy to when use.
Utility model content
The utility model is the technical issues of solving Switching Power Supply security risk, to provide a kind of band overcurrent protection Self-resetting Switching Power Supply.
The technical solution adopted in the utility model is as follows:
A kind of Switching Power Supply with overcurrent protection Self-resetting, comprising: input rectifying filter circuit, the input rectifying filtering Circuit is connected with AC power source;Power switch tube and high frequency transformer circuit, the power switch tube and high frequency transformer circuit It is connected with the input rectifying filter circuit;Output rectifier and filter, the output rectifier and filter are opened with the power It closes pipe and high frequency transformer circuit is connected;Feed circuit, the feed circuit are connected with the output rectifier and filter;Protection Circuit, the protection circuit are connected with the output rectifier and filter;Control circuit, the control circuit respectively with the function Rate switching tube and high frequency transformer circuit, the feed circuit are connected with the protection circuit, and the control circuit is used for basis The output DC voltage of the output rectifier and filter of the feed circuit feedback becomes the power switch tube and high frequency Transformer circuits are controlled to realize pressure stabilizing, and control inside according to the protection instruction and reset instruction of the protection circuit evolving The actuating of relay to realize overcurrent protection and Self-resetting respectively.
The input rectifying filter circuit includes input protection circuit, EMI (Electromagnetic Interference, electromagnetic interference) filter circuit, rectifier bridge and the first filter circuit, the input protection circuit respectively with friendship Galvanic electricity source is connected with the electromagnetic interface filter, and the electromagnetic interface filter is connected with the rectifier bridge, the rectifier bridge and described first Filter circuit is connected.
The power switch tube and high frequency transformer circuit include lateral circuit, a high frequency transformer of high frequency transformer Secondary side circuit, the auxiliary winding circuit of high frequency transformer, power switch tube circuit and RCD clamp circuit, the high frequency transformation Lateral circuit of device is connected with first filter circuit, the power switch tube circuit and the RCD clamp circuit respectively, The secondary side circuit of the high frequency transformer is connected with the output rectifier and filter, the high frequency transformer auxiliary winding electricity Road is connected with the control circuit.
The output rectifier and filter includes the secondary side AC rectification circuit of high frequency transformer, secondary side RC absorption Circuit and the second filter circuit, the secondary side AC rectification circuit and the secondary side RC absorbing circuit with the height The secondary side circuit of frequency power transformer is connected, second filter circuit respectively with the secondary side AC rectification circuit, described Secondary side RC absorbing circuit is connected with the DC output end of the Switching Power Supply.
The feed circuit includes output voltage bleeder circuit, comparison circuit and isolation transmission feed circuit, the output Voltage branch circuit is connected with the DC output end of the Switching Power Supply and the comparison circuit respectively, the comparison circuit and institute Isolation transmission feed circuit is stated to be connected.
The comparison circuit includes TL431, and the isolation transmission feed circuit includes PC817.
The protection circuit includes overcurrent protection circuit and self-resetting circuit, the overcurrent protection circuit respectively with institute It states control circuit to be connected with the DC output end of the Switching Power Supply, the self-resetting circuit is electric with the overcurrent protection respectively Road is connected with the control circuit.
The protection circuit further includes input protection circuit, excess voltage protection and overload protecting circuit.
The control circuit includes startup power supply circuit, oscillating circuit, current sampling comparison circuit and driving circuit, described Oscillating circuit is connected with the overload protecting circuit, and the current sampling comparison circuit is connected with the power switch tube circuit, The driving circuit is connected with the power switch tube circuit, and the startup power supply circuit is assisted with the high frequency transformer respectively Winding circuit is connected with the protection circuit.
The startup power supply circuit includes the relay, and the switch element of the relay is arranged in the high frequency transformation In the auxiliary winding circuit of device, the control element of the relay is connected with the self-resetting circuit.
The utility model has the beneficial effects that
The Switching Power Supply with overcurrent protection Self-resetting of the utility model, control circuit respectively with power switch tube and high frequency Transformer circuit, feed circuit are connected with protection circuit, and control circuit can be according to the output rectification filter electricity that feed circuit is fed back The output DC voltage on road controls power switch tube and high frequency transformer circuit to realize pressure stabilizing, and according to protection circuit The protection instruction of generation and the actuating of relay inside reset instruction control to realize overcurrent protection and Self-resetting respectively, as a result, Overcurrent protection circuit can be controlled by pure hardware circuit, and can be restarted in overcurrent signal disappearance power supply with Self-resetting Work, can not only improve service life, can also eliminate circuit safety hidden danger.
Detailed description of the invention
Fig. 1 is the block diagram of the Switching Power Supply with overcurrent protection Self-resetting of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the Switching Power Supply with overcurrent protection Self-resetting of the utility model one embodiment;
Fig. 3 is the circuit structure diagram of the input rectifying filter circuit of the utility model one embodiment;
Fig. 4 is the power switch tube of the utility model one embodiment and the circuit structure diagram of high frequency transformer circuit;
Fig. 5 is the output rectifier and filter of the utility model one embodiment and the circuit structure diagram of feed circuit;
Fig. 6 is the circuit structure diagram of the protection circuit of the utility model one embodiment;
Fig. 7 is the circuit structure diagram of the control circuit of the utility model one embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, the Switching Power Supply with overcurrent protection Self-resetting of the utility model embodiment, including input rectifying filter Wave circuit 10, power switch tube and high frequency transformer circuit 20, output rectifier and filter 30, feed circuit 40, protection circuit 50 and control circuit 60.
Wherein, input rectifying filter circuit 10 is connected with AC power source, power switch tube and high frequency transformer circuit 20 with Input rectifying filter circuit 10 is connected, and output rectifier and filter 30 is connected with power switch tube and high frequency transformer circuit 20, Feed circuit 40 is connected with output rectifier and filter 30, and protection circuit 50 is connected with output rectifier and filter 30, control electricity Road 60 is connected with power switch tube and high frequency transformer circuit 20, feed circuit 40 and protection circuit 50 respectively, control circuit 60 The output DC voltage of output rectifier and filter 30 for being fed back according to feed circuit 40 becomes power switch tube and high frequency Transformer circuits 20 are controlled to realize pressure stabilizing, and the protection instruction and reset instruction that are generated according to protection circuit 50 control inside The actuating of relay to realize overcurrent protection and Self-resetting respectively.
In one embodiment of the utility model, the circuit structure of the Switching Power Supply with overcurrent protection Self-resetting such as Fig. 2 It is shown.The Switching Power Supply of the utility model embodiment is described in detail below with reference to the specific structure of Fig. 2 and each circuit.
As shown in Figures 2 and 3, input rectifying filter circuit 10 may include input protection circuit, EMI filter circuit, rectification Bridge and the first filter circuit, input protection circuit are connected with AC power source and electromagnetic interface filter respectively, electromagnetic interface filter and rectifier bridge It is connected, rectifier bridge is connected with the first filter circuit.
Wherein, input protection circuit may include fuse F1, negative tempperature coefficient thermistor NC and varistor R6, R4 Deng fuse F1 can connect on the firewire of 220V AC power source.Electromagnetic interface filter is combined type electromagnetic interface filter, including common mode inductance L1, X capacitor C1, C2 and Y capacitance C3, C6, X capacitor C1 carry out first order filtering, and common mode inductance L1 and X capacitor C2 carries out second Grade filtering, can be used for filtering common mode interference, and Y capacitance C3, C6 can be used for filtering out DM EMI.One in the utility model is specific In embodiment, thin-film capacitor is can be used to reduce leakage current in C1, C2.First filter circuit includes polar capacitor E2, E4, rectifier bridge With the first filter circuit AC power source can be rectified and be filtered to export direct current.
As shown in Figure 2 and Figure 4, power switch tube and high frequency transformer circuit 20 may include the primary side electricity of high frequency transformer Road, the secondary side circuit of high frequency transformer, the auxiliary winding circuit of high frequency transformer, power switch tube circuit and RCD clamper electricity Lateral circuit on road, high frequency transformer is connected with the first filter circuit, power switch tube circuit and RCD clamp circuit respectively, The secondary side circuit of high frequency transformer is connected with output rectifier and filter, high frequency transformer auxiliary winding circuit and control circuit It is connected.
Wherein, power switch tube circuit includes power switch tube Q6, such as NMOS, the grid and source electrode of power switch tube Q6 It is connected to control circuit, drain electrode is connected to the primary side of high frequency transformer T1.RCD clamp circuit may include resistance R42, R43, Capacitor C31 and diode D14.To make the DC output end VO output voltage stabilization of Switching Power Supply in 24V, using high power switch Pipe adjusts duty ratio, by power switch tube and high frequency transformer, RCD clamp circuit, completes one in switching power circuit Reversals.The primary side and secondary side of high frequency transformer T1 all must be that alternating current could work normally, therefore input rectifying Filter circuit output direct current can not be converted by high frequency transformer, and power switch tube is used in the utility model embodiment Q6 is connected whithin a period of time and turns off, so that DC voltage be made to form the square wave with duty ratio.It works in RCD absorbing circuit In, condenser voltage rises, if raised condenser voltage is not discharged in next absorption process, next absorption process is just It can fail, cause the voltage of switching tube turn off process that can exceed that load voltage value, thus by over-voltage breakdown.It can become in high frequency Voltage-stabiliser tube is arranged in the primary side of depressor T1, then provides voltage to control circuit, prevents the excessive damage control circuit of voltage, is formed Overvoltage protection.
As shown in Figure 2 and Figure 5, output rectifier and filter 30 includes the secondary side AC rectification electricity of high frequency transformer Road, secondary side RC absorbing circuit and the second filter circuit, secondary side AC rectification circuit and secondary side RC absorbing circuit with The secondary side circuit of high frequency transformer is connected, and the second filter circuit is inhaled with secondary side AC rectification circuit, secondary side RC respectively Circuit is received to be connected with the DC output end of Switching Power Supply.Feed circuit 40 include output voltage bleeder circuit, comparison circuit and every From transmission feed circuit, output voltage bleeder circuit is connected with the DC output end of Switching Power Supply and comparison circuit respectively, compares Circuit is connected with transmission feed circuit is isolated.In one embodiment of the utility model, comparison circuit includes TL431, isolation Transmitting feed circuit includes PC817.
As shown in Figure 2 and Figure 6, protection circuit 50 may include overcurrent protection circuit and self-resetting circuit, overcurrent protection Circuit is connected with the DC output end of control circuit and Switching Power Supply respectively, self-resetting circuit respectively with overcurrent protection circuit and Control circuit is connected.Further, protection circuit 50 may also include input protection circuit, excess voltage protection and overload protection Circuit.
As shown in Figure 2 and Figure 7, control circuit 60 may include current-mode control chip, startup power supply circuit, oscillating circuit, Current sampling comparison circuit and driving circuit, oscillating circuit are connected with overload protecting circuit, current sampling comparison circuit and power Switching tube circuit is connected, and driving circuit is connected with power switch tube circuit, and startup power supply circuit is assisted with high frequency transformer respectively Winding circuit is connected with protection circuit.Startup power supply circuit includes relay, and the switch element of relay is arranged in high frequency transformation In the auxiliary winding circuit of device, the control element of relay is connected with self-resetting circuit.
Wherein, the low 20A/200V Schottky diode D13 of forward voltage drop, energy can be used in secondary side AC rectification circuit It is enough to reduce loss, improve the efficiency of entire circuit.Secondary side RC absorbing circuit includes R40 and C30.The utility model embodiment The output voltage of Switching Power Supply be 24V, output power 75W, therefore the second filter circuit, that is, output filter circuit selects C- L-C filter circuit, including polar capacitor C25, C29, filter inductance L2 and polar capacitor C18 and C10.To prevent the second filtering The electric current of circuit is excessive, in its output end one diode D3 of parallel connection, can play the role of overcurrent protection.Output voltage through R27, R26, R30 composition output voltage sample and obtain sampling voltage after dividing, and are compared with the 2.5V reference voltage in TL431. When positive error occurs in output voltage, sampling voltage is greater than 2.5V, and the pressure stabilizing value of TL431 reduces, photoelectric coupler output end electric current Increase, the voltage value that i.e. 1 foot in comparison end of chip is controlled in control circuit 60 increases, and controls the output end i.e. arteries and veins of 6 feet of chip Signal dutyfactor reduction is rushed, the turn-on time of switching tube is reduced, and output voltage reduces;, whereas if there is negative miss in output voltage Difference, the output pulse duty factor for controlling chip increase, and output voltage increases, and reaches pressure stabilizing purpose.
The voltage of the DC output end of Switching Power Supply divided, filter after add to the same mutually defeated people of two-way voltage comparator End.The non-inverting input terminal of comparator is the circuit of an electric current conversion voltage, is flowed through by the voltage on R18, R10 to detect The electric current of output loading.Resistance R22, R19 and R11, R12 form partial pressure reference circuit, set threshold voltage, and R22, R11 hinder It is worth adjustable, adapts to output and connect the protections of the different electrical equipment overcurrent situations of rated current.Threshold voltage is connected to comparator Inverting input terminal.When overcurrent phenomenon occurs in output loading, the electric current for flowing through R18 will become larger, and the pressure drop on R18 increases, same to phase Input terminal voltage, which rises, is greater than inverting input terminal, and diode D5, D6 conducting, comparator export high level, and photoelectrical coupler starts Work, triode Q2 are worked normally, and after Q1 conducting, the actuating of relay in control circuit 60, startup power supply circuit stops working, Switching Power Supply is in guard mode without output voltage, entire circuit.When overcurrent signal disappears or output loading works normally, Non-inverting input terminal voltage is less than inverting input terminal, diode D5, D6 cut-off, and comparator exports low level, and photoelectrical coupler stops It only works, triode Q2 ends, and the relay stopping movement in control circuit 60, startup power supply circuit still can not restart Work.At this moment the switch motion in self-resetting circuit, makes bulky capacitor discharge, and relay in control circuit 60 resets, again plus Input voltage, the startup power supply circuit being connected with self-resetting circuit restore normal, the normal output duty cycle of control circuit, switch electricity Source stabilizes the output voltage.
Oscillating circuit can produce the initial oscillation signal of control chip operation, and resistance R34 and capacitor C27 determine frequency of oscillation Size, in overload, output voltage reduces overload protecting circuit, and the photoelectrical coupler of feed circuit stops working.Control core The voltage of 8 foot of piece is charged by R50, R33 and Q, R49 to C22.When control 8 foot voltage of chip and C22 voltage difference of the two ends are less than Q PN junction conducting voltage when, transistor Q cut-off, oscillating circuit is disconnected, and the startup power supply circuit in control circuit 60 stops work Make, output voltage drops to zero, and 60 power supply of moment control circuit is reduced to zero, C22 and is discharged by R50, R33, in control circuit 60 Startup power supply circuit rework.Because output overloading does not release, photoelectrical coupler still stops working, and transistor Q is disconnected again. Only after output overloading releases, circuit can just restore to work normally.Current sampling comparison circuit is by R39, R41 and C26 Composition.Voltage on R41 reflects current instantaneous value, and when overcurrent occurs, the electric current of power switch tube Q6 drain electrode be will increase, Voltage on R41 will increase, and when being equal to 1V, control circuit 60 stops working.Driving circuit includes R37, R36, R39 and D12, R37, R36 parallel resistance value are the smaller the better, and value is 20 Ω herein, and D12 can prevent over-voltage breakdown circuit.
In general, as shown in Figures 1 to 7, AC rectification is filtered into smoother by input rectifying filter circuit 10 Direct current, direct current is converted into pulse voltage and is transferred to high frequency transformer one by power switch tube and high frequency transformer circuit 20 High frequency transformer secondary side alternating voltage is converted into DC voltage by secondary side, output rectifier and filter 30, and feed circuit 40 is examined Output DC voltage is surveyed, and compared with reference voltage, error is amplified by error amplifier, and is generated by control chip Pulse-width signal stabilizes the output voltage, and the overcurrent signal of output end can be compared analysis by protection circuit 50.
Further, in one embodiment of the utility model, fuse, pressure-sensitive electricity are passed through in alternating voltage 220V input The input protection circuit of the compositions such as resistance filters out the interference on power grid, while also filtering out power supply using EMI filter circuit Interference to power grid.It is allowed at direct current by pwm signal control switch pipe Q6 using rectifier bridge and electrolytic capacitor rectifying and wave-filtering Switching tube works in the state of turn-on and turn-off, is that be supplied to high frequency transformer primary for high-frequency alternating current by DC conversion Side carries out transformation, voltage required for secondary side generates, rectifier diode, four big electrolytic capacitor through output rectification filter and Inductance coil, to secondary side alternating current carry out rectifying and wave-filtering, since external communication electric frequency Possible waves are larger, by capacitor with Coil is filtered, available smoother direct current.And it exports DC voltage to pass signal by feed circuit 40 It is defeated by control circuit 60, controls PWM duty cycle, to achieve the purpose that stablize output.Protection circuit 50 can acquire the mistake of output end Current signal is transferred to voltage comparator, is connected to control circuit.Startup power supply in self-resetting circuit and control circuit 60 Circuit is connected, and when overcurrent situations occur, protects the voltage comparator in circuit 50 that can match setting ratio according to resistance Compared with threshold value, the change of variable resistance adapts to the overcurrent protection of different electrical equipments.The threshold value phase of over-current signal and voltage comparator Bigger, the relay in self-resetting circuit starts to act, and the startup power supply circuit of control circuit 60 can not work, entire circuit Without output voltage, start to protect circuit.When overcurrent signal disappears or output loading works normally, in self-resetting circuit after Electric appliance starts to act, and startup power supply circuit restores normal, and entire circuit stability output voltage realizes Self-resetting.
In conclusion according to the Switching Power Supply with overcurrent protection Self-resetting of the utility model embodiment, control circuit point It is not connected with power switch tube and high frequency transformer circuit, feed circuit and protection circuit, control circuit can be according to feed circuit The output DC voltage of the output rectifier and filter of feedback controls with reality power switch tube and high frequency transformer circuit Existing pressure stabilizing, and according to the actuating of relay inside the protection instruction and reset instruction control of protection circuit evolving to realize respectively Stream protection and Self-resetting can control overcurrent protection circuit by pure hardware circuit as a result, and in overcurrent signal disappearance electricity Source can restart work with Self-resetting, can not only improve service life, and can also eliminate circuit safety hidden danger.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (10)

1. a kind of Switching Power Supply with overcurrent protection Self-resetting characterized by comprising
Input rectifying filter circuit, the input rectifying filter circuit are connected with AC power source;
Power switch tube and high frequency transformer circuit, the power switch tube and high frequency transformer circuit and the input rectifying are filtered Wave circuit is connected;
Output rectifier and filter, the output rectifier and filter and the power switch tube and high frequency transformer circuit phase Even;
Feed circuit, the feed circuit are connected with the output rectifier and filter;
Circuit is protected, the protection circuit is connected with the output rectifier and filter;
Control circuit, the control circuit respectively with the power switch tube and high frequency transformer circuit, the feed circuit and The protection circuit is connected, the output rectifier and filter that the control circuit is used to be fed back according to the feed circuit Output DC voltage controls the power switch tube and high frequency transformer circuit to realize pressure stabilizing, and according to the protection The protection instruction of circuit evolving and the actuating of relay inside reset instruction control to realize overcurrent protection and Self-resetting respectively.
2. the Switching Power Supply according to claim 1 with overcurrent protection Self-resetting, which is characterized in that the input rectifying filter Wave circuit includes input protection circuit, EMI filter circuit, rectifier bridge and the first filter circuit, the input protection circuit difference Be connected with AC power source and the electromagnetic interface filter, the electromagnetic interface filter is connected with the rectifier bridge, the rectifier bridge with it is described First filter circuit is connected.
3. the Switching Power Supply according to claim 2 with overcurrent protection Self-resetting, which is characterized in that the power switch tube And high frequency transformer circuit includes a lateral circuit, the secondary side circuit of high frequency transformer, high frequency transformer of high frequency transformer Auxiliary winding circuit, power switch tube circuit and RCD clamp circuit, a lateral circuit of the high frequency transformer respectively with institute State the first filter circuit, the power switch tube circuit is connected with the RCD clamp circuit, the secondary side of the high frequency transformer Circuit is connected with the output rectifier and filter, and the high frequency transformer auxiliary winding circuit is connected with the control circuit.
4. the Switching Power Supply according to claim 3 with overcurrent protection Self-resetting, which is characterized in that the output rectification filter Wave circuit includes secondary side AC rectification circuit, secondary side RC absorbing circuit and the second filter circuit of high frequency transformer, institute State secondary side AC rectification circuit and the secondary side RC absorbing circuit with the secondary side circuit phase of the high frequency transformer Even, second filter circuit respectively with the secondary side AC rectification circuit, the secondary side RC absorbing circuit and described The DC output end of Switching Power Supply is connected.
5. the Switching Power Supply according to claim 4 with overcurrent protection Self-resetting, which is characterized in that the feed circuit packet Include output voltage bleeder circuit, comparison circuit and isolation transmission feed circuit, the output voltage bleeder circuit respectively with it is described The DC output end of Switching Power Supply is connected with the comparison circuit, and transmission feed circuit phase is isolated with described in the comparison circuit Even.
6. the Switching Power Supply according to claim 5 with overcurrent protection Self-resetting, which is characterized in that the comparison circuit packet TL431 is included, the isolation transmission feed circuit includes PC817.
7. the Switching Power Supply according to claim 5 or 6 with overcurrent protection Self-resetting, which is characterized in that the protection electricity Road includes overcurrent protection circuit and self-resetting circuit, the overcurrent protection circuit respectively with the control circuit and described open The DC output end in powered-down source is connected, the self-resetting circuit respectively with the overcurrent protection circuit and the control circuit phase Even.
8. the Switching Power Supply according to claim 7 with overcurrent protection Self-resetting, which is characterized in that the protection circuit is also Including input protection circuit, excess voltage protection and overload protecting circuit.
9. the Switching Power Supply according to claim 8 with overcurrent protection Self-resetting, which is characterized in that the control circuit packet Include startup power supply circuit, oscillating circuit, current sampling comparison circuit and driving circuit, the oscillating circuit and the overload protection Circuit is connected, and the current sampling comparison circuit is connected with the power switch tube circuit, the driving circuit and the power Switching tube circuit be connected, the startup power supply circuit respectively with the high frequency transformer auxiliary winding circuit and the protection circuit It is connected.
10. the Switching Power Supply according to claim 9 with overcurrent protection Self-resetting, which is characterized in that the startup power supply Circuit includes the relay, and the switch element of the relay is arranged in the auxiliary winding circuit of the high frequency transformer, The control element of the relay is connected with the self-resetting circuit.
CN201820976810.4U 2018-06-22 2018-06-22 Switching Power Supply with overcurrent protection Self-resetting Expired - Fee Related CN208707543U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820976810.4U CN208707543U (en) 2018-06-22 2018-06-22 Switching Power Supply with overcurrent protection Self-resetting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820976810.4U CN208707543U (en) 2018-06-22 2018-06-22 Switching Power Supply with overcurrent protection Self-resetting

Publications (1)

Publication Number Publication Date
CN208707543U true CN208707543U (en) 2019-04-05

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Application Number Title Priority Date Filing Date
CN201820976810.4U Expired - Fee Related CN208707543U (en) 2018-06-22 2018-06-22 Switching Power Supply with overcurrent protection Self-resetting

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108667320A (en) * 2018-06-22 2018-10-16 江苏理工学院 Switching Power Supply with overcurrent protection Self-resetting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108667320A (en) * 2018-06-22 2018-10-16 江苏理工学院 Switching Power Supply with overcurrent protection Self-resetting
CN108667320B (en) * 2018-06-22 2024-02-20 江苏理工学院 Switch power supply with overcurrent protection and self-reset

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