CN207603469U - A kind of strong switching power supply of job stability - Google Patents
A kind of strong switching power supply of job stability Download PDFInfo
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- CN207603469U CN207603469U CN201721711686.0U CN201721711686U CN207603469U CN 207603469 U CN207603469 U CN 207603469U CN 201721711686 U CN201721711686 U CN 201721711686U CN 207603469 U CN207603469 U CN 207603469U
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Abstract
The utility model discloses a kind of strong switching power supplies of job stability,It is provided with pre-error input circuitry,Power conversion circuit,Second current rectifying and wave filtering circuit,Output circuit,Postposition output circuit,Current-limiting protection circuit and pwm control circuit,The current-limiting protection circuit includes photoelectric coupled circuit,Transistor circuit,Indicator light circuit and comparator circuit,The output circuit connects comparator circuit,Comparator circuit connects transistor circuit by indicator light circuit,Transistor circuit is connected with pwm control circuit,The sampled signal of collected output circuit is compared with reference voltage using comparator circuit,Then it is output in transistor circuit by indicator light circuit,It is acted in photoelectric coupled circuit by transistor circuit again,So that optocoupler work,So as to provide a triggering level for pwm control circuit,So that pwm control circuit carries out duty ratio adjustment.
Description
Technical field
The utility model is related to the fields such as power technology, PWM technologies, and specifically, being that a kind of job stability is strong opens
Close regulated power supply.
Background technology
Power supply is the device that power is provided to electronic equipment, also referred to as power supply unit, it provides all components in computer
Required electric energy.Whether the size of power, electric current and voltage are stablized, and by the working performance for directly affecting computer and make
Use the service life.
Switching Power Supply is the time ratio turned on and off using modern power electronics technology, control switching tube, remains steady
Determine a kind of power supply of output voltage, Switching Power Supply is generally modulated (PWM) control IC and MOSFET by pulse width and formed.With
The development and innovation of Power Electronic Technique so that switch power technology is also innovated constantly.At present, Switching Power Supply with it is small-sized,
Light weight and efficient feature are widely used almost all of electronic equipment, are that current electronics and information industry rapid development can not
A kind of power mode lacked.
Switching Power Supply product is widely used in industrial automatic control, military industry equipment, research equipment, LED illumination, industry control are set
Standby, communication apparatus, power equipment, instrument and meter, Medical Devices, semiconductor refrigerating heating, air purifier, electronic refrigerator, liquid
Crystal display, LED lamp, communication apparatus, audio-visual products, safety monitoring, LED light bag, computer housing, digital product and instrument class
The fields of grade.
Pulse width modulation (PWM) is non-come the one kind controlled analog circuit using the numeral output of microprocessor
Normal effective technology is widely used in from many fields for measuring, communicating to power control with transformation.
Pulse width modulation is a kind of analog control mode, according to the variation of respective loads come modulation transistor base stage or
The biasing of metal-oxide-semiconductor grid, to realize the change of transistor or metal-oxide-semiconductor turn-on time, so as to fulfill switching power supply output
Change.This mode can be such that the output voltage of power supply is kept constant in operation conditions change, be the number using microprocessor
A kind of very effective technology that signal controls analog circuit.
The advantages of PWM control technologies are simple with its control, and flexibly and dynamic response is good and to become Power Electronic Technique most wide
The control mode of general application and the hot spot of people's research.Since the development of current science and technology is without between subject
Boundary, with reference to modern control theory thought or realize that resonance free wave switching technique will become the master that PWM control technologies develop
Want one of direction.Its variation according to respective loads is come the biasing of modulation transistor base stage or metal-oxide-semiconductor grid, to realize transistor
Or the change of metal-oxide-semiconductor turn-on time, so as to fulfill the change of switching power supply output.This mode can make the output electricity of power supply
Kept constant when being pressed in operation conditions change, be using microprocessor digital signal to analog circuit controlled one kind it is non-
Normal effective technology.
With the development of electronic technology, there are a variety of PWM technologies, including：Phase voltage control PWM, pulsewidth PWM
Method, random PWM, SPWM methods, line voltage control PWM etc., and the pulsewidth PWM methods used in nickel-hydrogen battery smart charger, it
It is using the spike train that each pulse width is equal as PWM waveforms, can be changed by the period for changing spike train with frequency modulation
The width or duty ratio of pulse can be such that voltage changes with frequency coordination with pressure regulation using suitable control method.It can pass through
Adjust period of PWM, PWM duty ratio and achieve the purpose that control charging current.
Pulsewidth modulation (PWM) basic principle：Control mode is exactly that the break-make of inverter circuit switching device is controlled, and is made
Output terminal obtains a series of equal pulse of amplitudes, and sine wave or required waveform are replaced with these pulses.Namely exist
Multiple pulses are generated in the half period of output waveform, the threshold voltages that wait for making each pulse are sinusoidal waveform, and the output obtained is put down
Sliding and low-order harmonic is few.The width of each pulse is modulated by certain rule, you can change inverter circuit output voltage
Output frequency also can be changed in size.
Utility model content
The purpose of this utility model is to provide a kind of strong switching power supplies of job stability, are set on output circuit
It is equipped with for detecting whether being more than design value there are output current, and be that can carry out the current limliting of protection act when being more than design value
Circuit is protected, when detecting that the output current at output circuit is higher than design value, starts current-limiting protection circuit work, and load
In one trigger signal to pwm control circuit, so that the duty ratio of pwm control circuit becomes smaller, so that entire power supply
Output voltage reduce, achieve the purpose that output overloading current limliting, avoid because output circuit output power supply instability (electric current mistake
Greatly, voltage value is too high or too low etc.) happen, avoid loading the situation for causing operation irregularity due to unstable power supply
Occur, the sampled signal of collected output circuit with reference voltage is compared using comparator circuit, then passes through finger
Indication lamp circuit is output in transistor circuit, then is acted in photoelectric coupled circuit by transistor circuit so that and optocoupler works, so as to
A triggering level is provided for pwm control circuit so that pwm control circuit carries out duty ratio adjustment (duty ratio becomes smaller).
The utility model is achieved through the following technical solutions：A kind of strong switching power supply of job stability, is provided with
Pre-error input circuitry, power conversion circuit, the second current rectifying and wave filtering circuit, output circuit, postposition output circuit, current-limiting protection circuit
And pwm control circuit, the pre-error input circuitry connect power conversion circuit, power conversion circuit connects the second rectifying and wave-filtering electricity
Road, the second current rectifying and wave filtering circuit connection output circuit, output circuit connection current-limiting protection circuit, current-limiting protection circuit connection PWM
Control circuit；The current-limiting protection circuit includes photoelectric coupled circuit, transistor circuit, indicator light circuit and comparator circuit, described
Output circuit connect comparator circuit, comparator circuit by indicator light circuit connect transistor circuit, transistor circuit with
Pwm control circuit is connected.
Further is that the utility model is better achieved, especially using following set-up modes：In the comparator circuit
It is provided with resistance R4, resistance R5, resistance R6, capacitance C1, capacitance C2, capacitance C3, diode D2 and amplifier chip UI2, output electricity
The current-limiting protection monitoring point on road is connected to by resistance R7 on the in-phase input end of amplifier chip UI2, capacitance C3 and diode D2
It is parallel with one another, and diode D2 after parallel connection and capacitance C3 are connected between output circuit current-limiting protection monitoring point and ground, amplifier
The inverting input of chip UI2 is grounded, and the connects end altogether of resistance R6 and resistance R5 by the resistance R5 and resistance R6 being serially connected
Connect reference voltage Vref；The inverting input of amplifier chip UI2 connects amplifier by the capacitance C1 being serially connected with resistance R4
The output terminal of chip UI2, capacitance C2 are connected in parallel between the inverting input and output terminal of amplifier chip UI2, and amplifier chip UI2 leads to
Cross indicator light circuit connection transistor circuit.
The plus earth of preferred diode D2, one end of capacitance C1 is connected with the output terminal of amplifier chip UI2.
Further is that the utility model is better achieved, especially using following set-up modes：In the indicator light circuit
The diode D1 being serially connected and resistance R2 is inside provided with, and the output signal of amplifier chip UI2 passes through the anode of diode D1
It is transported in transistor circuit after；The transistor circuit includes resistance R3 and transistor Q1, and photoelectric coupled circuit includes optocoupler
The anode of photodiode passes through resistance R1 connection power supply VCC, opto-coupler chip in chip UI1 and resistance R1, opto-coupler chip UI1
The collector connection pwm control circuit of phototriode in UI1, the emitter ground connection of phototriode, light in opto-coupler chip UI1
The collector of the cathode connection transistor Q1 of photodiode, the base stage of transistor Q1 are connect by resistance R3 in coupling chip UI1
Ground, and the base stage of transistor Q1 is connected with indicator light circuit (resistance R2), the emitter ground connection of transistor Q1.
Preferred diode D1 is using light emitting diode, and the anode of diode D1 connects the output of amplifier chip UI2
End.
Further is that the utility model is better achieved, especially using following set-up modes：In the preposition input electricity
Transformer circuit, the first current rectifying and wave filtering circuit, temperature sensor, overheating protection circuit and the fan of interconnection are provided in road
Circuit, the transformer circuit connect the first current rectifying and wave filtering circuit, and the first current rectifying and wave filtering circuit connection power conversion circuit is described
Temperature sensor is arranged on transformer circuit and is connected with overheating protection circuit, overheating protection circuit connection fan circuit,
The independent air feed of fan circuit detects the state of temperature of transformer in transformer circuit to transformer circuit, temperature sensor.
Further is that the utility model is better achieved, especially using following set-up modes：Further include input overvoltage/undervoltage
Circuit and circuit of power factor correction are protected, first current rectifying and wave filtering circuit connects input over under-voltage protection circuit and work(respectively
Rate factor correcting circuit, input over under-voltage protection circuit connection circuit of power factor correction, circuit of power factor correction and input
Over under-voltage protection circuit is all connected with power conversion circuit.
Further is that the utility model is better achieved, especially using following set-up modes：The output circuit with
Sampling comparison system is also associated between pwm control circuit, the sampling comparison system includes sample circuit and regulator circuit, institute
State output circuit connection sample circuit, sample circuit regulator circuit, regulator circuit connection pwm control circuit.
Further is that the utility model is better achieved, especially using following set-up modes：Further include short-circuit protection electricity
Road, the sample circuit connect short-circuit protection circuit, short-circuit protection circuit connection pwm control circuit.
Further is that the utility model is better achieved, especially using following set-up modes：Further include output overvoltage guarantor
Protection circuit, and output circuit connection output overvoltage protection circuit, output overvoltage protection circuit connection pwm control circuit.
Further is that the utility model is better achieved, especially using following set-up modes：The pwm control circuit
PWM main control chips use UC3842.
The utility model compared with prior art, has the following advantages and advantageous effect：
The utility model is provided on output circuit for detecting whether being more than design value, and when super there are output current
It is that can carry out the current-limiting protection circuit of protection act to cross design value, is designed when detecting that the output current at output circuit is higher than
During value, start current-limiting protection circuit work, and load in a trigger signal to PWM control circuits, so that PWM is controlled
The duty ratio of circuit becomes smaller, so that the output voltage of entire power supply reduces, achievees the purpose that output overloading current limliting, avoid because
Output power supply instability (electric current is excessive, voltage value is too high or too low etc.) for output circuit happens, avoid load by
Cause happening for operation irregularity in unstable power supply, utilize sampling of the comparator circuit to collected output circuit
Signal is compared with reference voltage, is then output in transistor circuit by indicator light circuit, then passes through transistor circuit
It acts in photoelectric coupled circuit so that optocoupler works, so as to provide a triggering level for pwm control circuit so that PWM control electricity
Road carries out duty ratio adjustment (duty ratio becomes smaller).
Indicator light circuit set by the utility model not only acts as the effect of signal transmission, additionally it is possible to play indicator light
Effect, when output circuit is there are during overcurrent condition, power conversion circuit works, it indicates that lamp is lit so that user can
Know there is a situation where overcurrent in circuit in time.
The utility model realizes that overcurrent protection drive signal is transferred to pwm control circuit using optocoupler, can reach
The purpose of signal is transmitted, while can also realize being isolated between pwm control circuit and current foldback circuit, is avoided between the two
It forms signal interference and influences the even running of entire circuit.
The utility model is designed using various kinds of protective circuit, can all can when there is short circuit, overvoltage or under-voltage condition
Enough stable operations have the features such as the operation is stable, safe to use.
Overheat protecting system set by the utility model in real time can be monitored the temperature of transformer, and utilize
Overheating protection circuit control fan circuit carries out automatic air feed, so that the temperature at transformer circuit reduces, reaches reduction
The purpose of the module heating, and after permission temperature range is appeared in, overheating protection circuit will send shutdown instruction and arrives fan again
On circuit so that fan circuit is automatically stopped operation, plays energy-efficient purpose.
Description of the drawings
Fig. 1 is the utility model principle block diagram.
Fig. 2 is current foldback circuit figure described in the utility model.
Specific embodiment
The utility model is described in further detail with reference to embodiment, but the embodiment of the utility model is not
It is limited to this.
Purpose, technical scheme and advantage to make the utility model embodiment are clearer, below in conjunction with this practicality
The technical solution in the utility model embodiment is clearly and completely described in attached drawing in novel embodiment, shows
So, described embodiment is the embodiment of a part of embodiment of the utility model rather than whole.Based on this practicality
Embodiment in novel, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.Therefore, the implementation to the utility model provided in the accompanying drawings below
The detailed description of mode is not intended to limit claimed the scope of the utility model, but is merely representative of the utility model
Selected embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under the premise of dynamic, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be appreciated that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ",
The orientation or position relationship of the instructions such as " clockwise ", " counterclockwise " be based on orientation shown in the drawings or position relationship, be only for
Convenient for description the utility model and simplify description rather than instruction or imply signified equipment or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature." multiple " are meant that two or two in the description of the present invention,
More than, unless otherwise specifically defined.
In the utility model unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be
Mechanical connection or electrical connection；It can be directly connected, can also be indirectly connected by intermediary, can be two
The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis
Concrete condition understands concrete meaning of the above-mentioned term in the utility model.
In the utility model unless specifically defined or limited otherwise, fisrt feature second feature it " on " or it
" under " can be in direct contact including the first and second features, it is not to be in direct contact but lead to that can also include the first and second features
Cross the other characterisation contact between them.Moreover, fisrt feature second feature " on ", " top " and " above " including
One feature is right over second feature and oblique upper or is merely representative of fisrt feature level height higher than second feature.First is special
Sign second feature " under ", " lower section " and " below " including fisrt feature immediately below second feature and obliquely downward or only
Represent that fisrt feature level height is less than second feature.
Embodiment 1：
A kind of strong switching power supply of job stability is provided on output circuit for detecting whether there is output
Electric current is more than design value, and is that can carry out the current-limiting protection circuit of protection act when being more than design value, and electricity is exported when detecting
When output current at road is higher than design value, start current-limiting protection circuit work, and load a trigger signal to PWM control electricity
On the road, so that the duty ratio of pwm control circuit becomes smaller, so that the output voltage of entire power supply reduces, reach output
It overloads the purpose of current limliting, avoids the output power supply instability because of output circuit (electric current is excessive, voltage value is too high or too low etc.)
Happen, avoid loading due to unstable power supply and cause happening for operation irregularity, utilize comparator circuit pair
The sampled signal of collected output circuit is compared with reference voltage, is then output to transistor electricity by indicator light circuit
Lu Zhong, then acted in photoelectric coupled circuit by transistor circuit so that optocoupler works, so as to provide one for pwm control circuit
Triggering level so that pwm control circuit carries out duty ratio adjustment (duty ratio becomes smaller), as shown in Figure 1 and Figure 2, especially using following
Setting structure：It is provided with pre-error input circuitry, power conversion circuit, the second current rectifying and wave filtering circuit, output circuit, postposition output electricity
Road, current-limiting protection circuit and pwm control circuit, the pre-error input circuitry connect power conversion circuit, and power conversion circuit connects
Connect the second current rectifying and wave filtering circuit, the second current rectifying and wave filtering circuit connection output circuit, output circuit connection current-limiting protection circuit, current limliting
Protect circuit connection pwm control circuit；The current-limiting protection circuit include photoelectric coupled circuit, transistor circuit, indicator light circuit and
Comparator circuit, the output circuit connect comparator circuit, and comparator circuit connects transistor circuit by indicator light circuit,
Transistor circuit is connected with pwm control circuit.
After the processing such as alternating current is depressured in pre-error input circuitry, rectification, filtering, incited somebody to action by power conversion circuit
The energy of DC power supply is converted to the signal power needed for load, and it is whole to be then loaded into progress in the second current rectifying and wave filtering circuit
Stream, filtering operation, and the various regulated power supplies needed for by output circuit output；The current-limiting protection circuit, to output circuit
Output current be detected, when detect the output current at output circuit be higher than design value when, start current-limiting protection circuit
Work, and load in a trigger signal to pwm control circuit, so that the duty ratio of pwm control circuit becomes smaller, so as to
So that the output voltage of entire power supply reduces, achieve the purpose that output overloading current limliting, avoid because the output of output circuit is powered
Happening for unstable (electric current being excessive, voltage value is too high or too low etc.), avoids loading due to unstable power supply and causing
Operation irregularity happens；In specific design in use, being believed using comparator circuit the sampling of collected output circuit
It number is compared, is then output in transistor circuit by indicator light circuit, then made by transistor circuit with reference voltage
With in photoelectric coupled circuit so that optocoupler works, so as to provide a triggering level for PWM control circuits so that PWM control electricity
Road carries out duty ratio adjustment (duty ratio becomes smaller).
Embodiment 2：
The present embodiment is further optimized based on the above embodiments, and as shown in Figure 1 and Figure 2, further is more preferable
The utility model is realized on ground, especially using following set-up modes：Resistance R4, resistance R5, electricity are provided in the comparator circuit
Resistance R6, capacitance C1, capacitance C2, capacitance C3, diode D2 and amplifier chip UI2, the current-limiting protection monitoring point of output circuit pass through
Resistance R7 is connected on the in-phase input end of amplifier chip UI2, and capacitance C3 and diode D2 are parallel with one another, and two poles after parallel connection
Pipe D2 and capacitance C3 are connected between output circuit current-limiting protection monitoring point and ground, and the inverting input of amplifier chip UI2 passes through
The resistance R5 being serially connected and resistance R6 is grounded, and resistance R6 connects reference voltage Vref with the connects end altogether of resistance R5；Amplifier core
The inverting input of piece UI2 connects the output terminal of amplifier chip UI2 by the capacitance C1 that is serially connected with resistance R4, and capacitance C2 is simultaneously
It is associated between the inverting input and output terminal of amplifier chip UI2, amplifier chip UI2 connects transistor electricity by indicator light circuit
Road.
The plus earth of preferred diode D2, one end of capacitance C1 is connected with the output terminal of amplifier chip UI2.
Embodiment 3：
The present embodiment is advanced optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The utility model is better achieved, especially using following set-up modes：It is provided with what is be serially connected in the indicator light circuit
Diode D1 and resistance R2, and the output signal of amplifier chip UI2 entered by the anode of diode D1 after be transported to transistor
In circuit；The transistor circuit includes resistance R3 and transistor Q1, and photoelectric coupled circuit includes opto-coupler chip UI1 and resistance R1, light
The collection that the anode of photodiode passes through phototriode in resistance R1 connections power supply VCC, opto-coupler chip UI1 in coupling chip UI1
Electrode connects pwm control circuit, the emitter ground connection of phototriode in opto-coupler chip UI1, photosensitive two in opto-coupler chip UI1
The collector of the cathode connection transistor Q1 of pole pipe, the base stage of transistor Q1 is grounded by resistance R3, and the base stage of transistor Q1
It is connected with indicator light circuit (resistance R2), the emitter ground connection of transistor Q1.
Preferred diode D1 is using light emitting diode, and the anode of diode D1 connects the output of amplifier chip UI2
End.
When in use, it when the output circuit at output circuit current-limiting protection monitoring point is excessive, is arranged at monitoring point
The voltage at the both ends of manganese-copper filament will rise, and the voltage is loaded into through resistance R7 on the in-phase input end of amplifier chip UI2 at this time,
So that the in-phase input end power supply of amplifier chip UI2 rises, the voltage high pressure that will lead to amplifier chip UI2 in-phase input ends at this time
Output HIGH voltage is caused transistor Q1 to be connected, optocoupler core by the voltage of amplifier chip UI2 inverting inputs, amplifier chip UI2
Photoelectric effect occurs for piece UI1, and a triggering level will be provided to pwm control circuit so that pwm control circuit carries out duty ratio
The adjustment to become smaller, so as to achieve the purpose that overload current limliting.
Embodiment 4：
The present embodiment is advanced optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The utility model is better achieved, especially using following set-up modes：Interconnection is provided in the pre-error input circuitry
Transformer circuit, the first current rectifying and wave filtering circuit, temperature sensor, overheating protection circuit and fan circuit, transformer electricity
Road connects the first current rectifying and wave filtering circuit, the first current rectifying and wave filtering circuit connection power conversion circuit, and the temperature sensor is arranged on
It is connected on transformer circuit and with overheating protection circuit, overheating protection circuit connection fan circuit, the independent air feed of fan circuit
To transformer circuit, temperature sensor detects the state of temperature of transformer in transformer circuit.
First current rectifying and wave filtering circuit, when alternating current will be filtered after transformer circuit decompression processing by the first rectification
The rectification of wave device and filtering process then obtain direct current output and pass through energy conversion of the power conversion circuit by DC power supply
For the signal power needed for loading, then will rectifying and wave-filtering processing be carried out by the second current rectifying and wave filtering circuit.
When in use, temperature sensor monitors the temperature change value of transformer in real time, and gathered data is transmitted to overheat
It protects in circuit, when there is temperature value of the detected value more than setting, driving fan circuit is started to work, fan circuit is independent
Air feed is to transformer circuit so that transformer temperature declines, and temperature sensor continues to monitor, and model is automatically turned off when temperature drops to
After enclosing, power supply that overheating protection circuit will block fan circuit so that fan circuit is stopped, so as to reach the confession of automation
Wind, and energy-efficient purpose can be played.
Embodiment 5：
The present embodiment is advanced optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The utility model is better achieved, especially using following set-up modes：Further include input over under-voltage protection circuit and power factor
Correcting circuit, first current rectifying and wave filtering circuit connects input over under-voltage protection circuit and circuit of power factor correction respectively, defeated
Enter over under-voltage protection circuit connection circuit of power factor correction, circuit of power factor correction and input over under-voltage protection circuit all with
Power conversion circuit is connected.
The input over under-voltage protection circuit, is used from the first current rectifying and wave filtering circuit, over-pressed or under-voltage when occurring
During situation, by outputs level signals to pwm control circuit, pwm control circuit will be off after receiving signal, and power supply will be without defeated
Go out.
The circuit of power factor correction, for improving the transfer efficiency of entire power supply.
Embodiment 6：
The present embodiment is advanced optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The utility model is better achieved, especially using following set-up modes：Also connect between the output circuit and pwm control circuit
Sampling comparison system is connected to, the sampling comparison system includes sample circuit and regulator circuit, the output circuit connection sampling
Circuit, sample circuit regulator circuit, regulator circuit connection pwm control circuit.
The sample circuit will be sampled the output of output circuit, then feed back to PWM controls using regulator circuit
In circuit, pwm control circuit will make corresponding duty ratio adjustment according to the feedback voltage, and it is steady to be finally reached output circuit output
Fixed DC voltage.
Embodiment 7：
The present embodiment is advanced optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The utility model is better achieved, especially using following set-up modes：Further include short-circuit protection circuit, the sample circuit connection
Short-circuit protection circuit, short-circuit protection circuit connection pwm control circuit；When there are short-circuit conditions, short-circuit protection circuit will be sent
On one gasket to pwm control circuit, pwm control circuit shutdown so that entire power supply plays the mesh of short-circuit protection without output
's.
Embodiment 8：
The present embodiment is advanced optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The utility model is better achieved, especially using following set-up modes：Output overvoltage protection circuit is further included, and output circuit connects
Connect output overvoltage protection circuit, output overvoltage protection circuit connection pwm control circuit；It is more than setting value when there is output voltage
When, output overvoltage protection circuit work, and on output level to pwm control circuit so that the duty ratio of pwm control circuit obtains
Corresponding adjustment, so as to when output circuit output drop in setting value.
Embodiment 9：
The present embodiment is advanced optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The utility model is better achieved, especially using following set-up modes：The PWM main control chips of the pwm control circuit use
UC3842。
The above, is only the preferred embodiment of the utility model, and limit in any form is not done to the utility model
System, every any simple modification made according to the technical essence of the utility model to above example, equivalent variations, each falls within
Within the scope of protection of the utility model.
Claims (9)
1. a kind of strong switching power supply of job stability, it is characterised in that：It is provided with pre-error input circuitry, power conversion electricity
Road, the second current rectifying and wave filtering circuit, output circuit, postposition output circuit, current-limiting protection circuit and pwm control circuit, it is described preposition
Input circuit connects power conversion circuit, and power conversion circuit connects the second current rectifying and wave filtering circuit, and the second current rectifying and wave filtering circuit connects
Connect output circuit, output circuit connection current-limiting protection circuit, current-limiting protection circuit connection pwm control circuit；The current-limiting protection
Circuit includes photoelectric coupled circuit, transistor circuit, indicator light circuit and comparator circuit, the output circuit connection comparator electricity
Road, comparator circuit connect transistor circuit by indicator light circuit, and transistor circuit is connected with pwm control circuit.
2. a kind of strong switching power supply of job stability according to claim 1, it is characterised in that：The comparator
Resistance R4, resistance R5, resistance R6, capacitance C1, capacitance C2, capacitance C3, diode D2 and amplifier chip UI2 are provided in circuit,
The current-limiting protection monitoring point of output circuit is connected to by resistance R7 on the in-phase input end of amplifier chip UI2, capacitance C3 and two
Pole pipe D2 is parallel with one another, and diode D2 after parallel connection and capacitance C3 are connected to output circuit current-limiting protection monitoring point and ground
Between, the inverting input of amplifier chip UI2 is grounded by the resistance R5 and resistance R6 being serially connected, and resistance R6 and resistance R5
Connects end altogether connection reference voltage Vref；The inverting input of amplifier chip UI2 is connected by the capacitance C1 and resistance R4 being serially connected
The output terminal of amplifier chip UI2 is connect, capacitance C2 is connected in parallel between the inverting input and output terminal of amplifier chip UI2, amplifier core
Piece UI2 connects transistor circuit by indicator light circuit.
3. a kind of strong switching power supply of job stability according to claim 2, it is characterised in that：In the instruction
The diode D1 being serially connected and resistance R2 is provided in circuit for lamp, and the output signal of amplifier chip UI2 passes through diode D1
Anode enter after be transported in transistor circuit；The transistor circuit includes resistance R3 and transistor Q1, photoelectric coupled circuit packet
Include opto-coupler chip UI1 and resistance R1, the anode of photodiode passes through resistance R1 connection power supply VCC, optocoupler in opto-coupler chip UI1
The collector connection pwm control circuit of phototriode in chip UI1, the emitter of phototriode connects in opto-coupler chip UI1
Ground, the collector of the cathode connection transistor Q1 of photodiode, the base stage of transistor Q1 pass through resistance R3 in opto-coupler chip UI1
Ground connection, and the base stage of transistor Q1 is connected with indicator light circuit, the emitter ground connection of transistor Q1.
4. a kind of strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：Described
Transformer circuit, the first current rectifying and wave filtering circuit, temperature sensor, the overheating protection of interconnection are provided in pre-error input circuitry
Circuit and fan circuit, the transformer circuit connect the first current rectifying and wave filtering circuit, and the first current rectifying and wave filtering circuit connection power becomes
Circuit is changed, the temperature sensor is arranged on transformer circuit and is connected with overheating protection circuit, and overheating protection circuit connects
Wind-receiving fan circuit, the independent air feed of fan circuit detect the temperature of transformer in transformer circuit to transformer circuit, temperature sensor
Degree state.
5. a kind of strong switching power supply of job stability according to claim 4, it is characterised in that：Further include input
Over under-voltage protection circuit and circuit of power factor correction, first current rectifying and wave filtering circuit connect input overvoltage/undervoltage protection electricity respectively
Road and circuit of power factor correction, input over under-voltage protection circuit connection circuit of power factor correction, circuit of power factor correction
All it is connected with input over under-voltage protection circuit with power conversion circuit.
6. a kind of strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：Described
Be also associated between output circuit and pwm control circuit sampling comparison system, it is described sampling comparison system include sample circuit and
Regulator circuit, the output circuit connect sample circuit, sample circuit regulator circuit, regulator circuit connection pwm control circuit.
7. a kind of strong switching power supply of job stability according to claim 6, it is characterised in that：Further include short circuit
Circuit is protected, the sample circuit connects short-circuit protection circuit, short-circuit protection circuit connection pwm control circuit.
8. a kind of strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：It further includes
Output overvoltage protection circuit, and output circuit connection output overvoltage protection circuit, output overvoltage protection circuit connection PWM control electricity
Road.
9. a kind of strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：The PWM
The PWM main control chips of control circuit use UC3842.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721711686.0U CN207603469U (en) | 2017-12-11 | 2017-12-11 | A kind of strong switching power supply of job stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721711686.0U CN207603469U (en) | 2017-12-11 | 2017-12-11 | A kind of strong switching power supply of job stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207603469U true CN207603469U (en) | 2018-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721711686.0U Expired - Fee Related CN207603469U (en) | 2017-12-11 | 2017-12-11 | A kind of strong switching power supply of job stability |
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| Country | Link |
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| CN (1) | CN207603469U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN109980928A (en) * | 2019-04-24 | 2019-07-05 | 北京无线电测量研究所 | A kind of the channel power source Fault Isolation circuit and device of high input voltage T/R component |
-
2017
- 2017-12-11 CN CN201721711686.0U patent/CN207603469U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN109980928A (en) * | 2019-04-24 | 2019-07-05 | 北京无线电测量研究所 | A kind of the channel power source Fault Isolation circuit and device of high input voltage T/R component |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A switching regulated power supply with strong working stability Effective date of registration: 20210915 Granted publication date: 20180710 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: SHAANXI YILIAN ELECTRICAL EQUIPMENT Co.,Ltd. Registration number: Y2021990000830 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180710 Termination date: 20211211 |