CN207559872U - Power-supply system based on over-and under-voltage design protection - Google Patents
Power-supply system based on over-and under-voltage design protection Download PDFInfo
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Abstract
The utility model discloses the power-supply systems based on over-and under-voltage design protection; it is provided with prime protection circuit, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage protection system; over-and under-voltage protection circuit is further included, reference voltage circuit, overvoltage crowbar, under-voltage protecting circuit are provided in over-and under-voltage protection circuit；Amplifier chip U1A is provided in overvoltage crowbar, overvoltage detection input circuit, over-pressed benchmark input circuit, circuit is protected by prime, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage protection system match, obtain required regulated power supply, over-and under-voltage is set to protect circuit, when there is overvoltage or undervoltage condition, overvoltage crowbar or under-voltage protecting circuit are started to work, it will be in outputs level signals to PWM controller, PWM controller will be off after receiving signal, entire power supply is without output, realize the purpose of overvoltage or under-voltage protection.
Description
Technical field
The utility model is related to the fields such as power technology, PWM technologies, are based on over-and under-voltage design protection specifically
Power-supply system.
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 by pulse width（PWM）IC and MOSFET is controlled to form.With electricity
The development and innovation of power electronic technology so that switch power technology is also innovated constantly.At present, Switching Power Supply is with small-sized, light
Amount and efficient feature are widely used almost all of electronic equipment, are that current electronics and information industry rapid development is indispensable
A kind of few power mode.
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 is modulated（PWM）It 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 waveform, arteries and veins can be changed with frequency modulation by the period for changing spike train
The width or duty ratio of punching can be such that voltage changes with frequency coordination with pressure regulation using suitable control method.Tune can be passed through
The period of whole PWM, the duty ratio of PWM 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 the power-supply systems based on over-and under-voltage design protection, and electricity is protected by prime
Road, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage protection system match
It closes, obtains required regulated power supply, while setting can carry out Switching Power Supply overvoltage or deficient on prime current rectifying and wave filtering circuit
The over-and under-voltage protection circuit of pressure protection, when there is overvoltage or undervoltage condition, overvoltage crowbar or under-voltage protecting circuit are opened
Beginning work, by outputs level signals to PWM controller, PWM controller will be off after receiving signal, and entire power supply is without defeated
Go out, realize the purpose of overvoltage or under-voltage protection, there is reasonable design, easy to use.
The utility model is achieved through the following technical solutions：Based on the power-supply system of over-and under-voltage design protection, it is provided with
Prime protection circuit, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage are protected
Protecting system, prime protection circuit connection prime current rectifying and wave filtering circuit, prime current rectifying and wave filtering circuit connection power conversion system, power
Transformation system is connected with rear class output circuit, rear class output circuit connection PWM controller, PWM controller connection power conversion
System；Over-and under-voltage protection circuit is further included, reference voltage circuit, overvoltage protection electricity are provided in over-and under-voltage protection circuit
Road, under-voltage protecting circuit, input terminal of the reference voltage circuit respectively with under-voltage protecting circuit and overvoltage crowbar are connected
It connects, overvoltage crowbar connects prime current rectifying and wave filtering circuit, overvoltage crowbar and under-voltage protecting circuit with under-voltage protecting circuit
All it is connected with PWM controller；Amplifier chip U1A, overvoltage detection input circuit, over-pressed base are provided in overvoltage crowbar
Quasi- input circuit, prime current rectifying and wave filtering circuit detect the in-phase input end of input circuit connection amplifier chip U1A, base by overvoltage
The quasi- over-pressed benchmark input circuit of potential circuit connection, the inverting input of over-pressed benchmark input circuit connection amplifier chip U1A, fortune
The output terminal for putting chip U1A is connected by diode D1 with PWM controller.
Further is that the utility model is better achieved, especially using following setting structures：The overvoltage detection input
Circuit includes resistance R1, resistance R2, resistance R3, resistance R4 and capacitance C1, the first end connection prime rectifying and wave-filtering electricity of resistance R1
Road, the first end of the second end of resistance R1 respectively with the first end of resistance R2, the first end of capacitance C1 and resistance R3 are connected, electricity
The second end of resistance R2 is connected and is grounded with the second end of the second end of capacitance C1 and resistance R4 respectively, the second end point of resistance R3
In-phase input end not with the first end of resistance R4 and amplifier chip U1A is connected；The overvoltage benchmark input circuit includes electricity
R6 and resistance R5 is hindered, resistance R5 and resistance R6 are serially connected, and the resistance R5 to connect connects amplifier core with the connects end altogether of resistance R6
The inverting input of piece U1A, the non-connects end altogether ground connection of resistance R5, the output of the non-connects end altogether connection reference voltage circuit of resistance R6
End.
Further is that the utility model is better achieved, especially using following setting structures：The under-voltage protecting circuit
Including amplifier chip U1B, under-voltage detection input circuit, under-voltage benchmark input circuit, the prime current rectifying and wave filtering circuit is by owing
The inverting input of pressure detection input circuit connection amplifier chip U1B, reference voltage circuit connect under-voltage benchmark input circuit, owe
Press the in-phase input end of benchmark input circuit connection amplifier chip U1B, the output terminal of amplifier chip U1B by diode D2 with
PWM controller is connected.
Further is that the utility model is better achieved, especially using following setting structures：The under-voltage detection input
Circuit includes resistance R7, resistance R8, resistance R9, resistance R4 and capacitance C2, the first end connection prime rectifying and wave-filtering electricity of resistance R7
Road, the first end of the second end of resistance R7 respectively with the first end of resistance R8, the first end of capacitance C2 and resistance R9 are connected, electricity
The second end of resistance R8 is connected and is grounded with the second end of the second end of capacitance C2 and resistance R10 respectively, the second end of resistance R9
The inverting input with the first end of resistance R10 and amplifier chip U1B is connected respectively；The under-voltage benchmark input circuit includes
Resistance R12 and resistance R11, resistance R12 and resistance R11 are serially connected, and the resistance R11 and the connects end altogether of resistance R12 that connect connect
Connect the in-phase input end of amplifier chip U1B, the non-connects end altogether ground connection of resistance R11, the non-connects end altogether connection reference voltage of resistance R12
The output terminal of circuit.
Further is that the utility model is better achieved, especially using following setting structures：The reference voltage circuit
Including reference voltage source and the zener diode Z1 being serially connected and resistance R13, and the output terminal connection of reference voltage source is over-pressed
Circuit and under-voltage protecting circuit are protected, reference voltage source is grounded by the zener diode Z1 and resistance R13 being serially connected.It is preferred that
The zener diode Z1 anode connection resistance R13, zener diode DZ1 cathode connection reference voltage source output
End.
Further is that the utility model is better achieved, especially using following setting structures：It is protected in the Current Voltage
Reference signal circuit, voltage stabilization and current stabilization selection circuit, current feedback circuit, current-limiting circuit, electric current display electricity are provided in protecting system
Road, voltage feedback circuit, pressure limiting circuit and voltage display circuit, the rear class output circuit connect respectively current feedback circuit and
Voltage feedback circuit, current feedback circuit and voltage feedback circuit all connect voltage stabilization and current stabilization selection circuit, voltage stabilization and current stabilization selection electricity
Road is connected with PWM controller, reference signal circuit connection voltage stabilization and current stabilization selection circuit, current display circuit and current feedback electricity
Road is connected, and voltage display circuit is connected with voltage feedback circuit, current feedback circuit connection current-limiting circuit, Voltage Feedback electricity
Road connects pressure limiting circuit, and current-limiting circuit and pressure limiting circuit all connect PWM controller.Preferably, output circuit connects voltage respectively
Feedback circuit and current feedback circuit.
Further is that the utility model is better achieved, especially using following setting structures：The power conversion system
Driving circuit, full-bridge converter and transformer circuit are inside provided with, rear class rectifying and wave-filtering is provided in the rear class output circuit
Circuit and output circuit, PWM controller connection driving circuit, driving circuit connection full-bridge converter, full-bridge converter connection become
Transformer circuits, transformer circuit connection rear class current rectifying, rear class current rectifying connection output circuit.
Further is that the utility model is better achieved, especially using following setting structures：It further includes and PWM controller
The thermal-shutdown circuit being connected, temperature sensor Simultaneous Monitoring driving circuit, the full-bridge converter of the thermal-shutdown circuit
And the temperature change of transformer circuit.
Further is that the utility model is better achieved, especially using following setting structures：It is filtered in the prime rectification
Auxiliary power circuit is also associated on wave circuit, and auxiliary power circuit is for electrical connection PWM controller.
Further is that the utility model is better achieved, especially using following setting structures：The prime protects circuit
Including lightning prevention circuit, surge restraint circuit and power-supply filter, the lightning prevention circuit connects surge restraint circuit, surge suppression
Circuit processed connects power-supply filter, and power-supply filter is connected with the input terminal of prime current rectifying and wave filtering circuit.
The utility model compared with prior art, has the following advantages and advantageous effect：
The utility model by prime protect circuit, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, after
Grade output circuit and Current Voltage protection system match, and obtain required regulated power supply, while in prime current rectifying and wave filtering circuit
Upper setting can carry out Switching Power Supply overvoltage or the over-and under-voltage of under-voltage protection protects circuit, when appearance overvoltage or undervoltage condition
When, overvoltage crowbar or under-voltage protecting circuit are started to work, and by outputs level signals to PWM controller, PWM controller is received
It will be off after to signal, entire power supply realizes the purpose of overvoltage or under-voltage protection, have reasonable design, user without output
Just the features such as.
The utility model sets the Current Voltage protection system with defencive function on power output end, can be when appearance
In the case of output overcurrent or/and overvoltage, automatic protection is carried out so that output current or voltage in allowed limits, avoid
Since overcurrent or overvoltage cause what circuit to be powered was burned out to happen.
The utility model sets current display circuit in Current Voltage protection system, can show output current in real time
Value, so as to user can real-time awareness whether in allowed limits supply the current value of DC power supply, with reasonable design,
The features such as easy to use.
Surge restraint circuit set by the utility model can effectively inhibit the surge voltage in alternating current, avoid wave
Voltage is gushed to damage entire circuit.
Various protection circuits set by the utility model can be by changing the duty ratio of PWM controller, so as to reach
To the purpose for changing output voltage.
The utility model uses voltage-stabiliser tube and the matched pattern of reference voltage source as overvoltage crowbar or under-voltage protection
Circuit is by reference voltage, so that the stability of the two and precision higher, can effectively realize overvoltage protection or/and owe
Press the purpose of protection.
The thermal-shutdown circuit of the utility model setting can work as driving circuit or/and full-bridge converter or/and transformer
When temperature anomaly occurs in circuit, overheat protector is carried out so that the duty ratio of PWM controller becomes smaller, so that entire power supply
Output reduces, and revert in the range of permission.
The voltage display circuit that the utility model is set in Current Voltage protection system can show output electricity in real time
Pressure value, so as to user can real-time awareness whether in allowed limits supply the electric current pressure value of DC power supply.
The data that the utility model is carried out using light emitting diode between overvoltage protection or under-voltage protection and PWM controller pass
It is defeated, it can allow user that can understand and know that protection circuit is starting to act.
The utility model individually directly takes electricity using an auxiliary power circuit and is converted out of prime current rectifying and wave filtering circuit
For the required working power of PWM controller, can avoid the working power of PWM controller is influenced by output circuit so that
PWM controller can be steady in a long-term work, improve the work validity of entire power supply.
The utility model carries out signal acquisition by the outlet side in prime current rectifying and wave filtering circuit so that entire circuit structure
Stability higher.
The utility model is designed using various kinds of protective circuit, can all can when there is overvoltage, overcurrent or under-voltage condition
Enough stable operations have the features such as the operation is stable, safe to use.
Description of the drawings
Fig. 1 is the utility model principle block diagram.
Fig. 2 protects circuit diagram for over-and under-voltage 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.
Embodiment 1：
Based on the power-supply system of over-and under-voltage design protection, circuit, prime current rectifying and wave filtering circuit, PWM are protected by prime
Controller, power conversion system, rear class output circuit and Current Voltage protection system match, and obtain required regulated power supply,
Setting can carry out Switching Power Supply overvoltage on prime current rectifying and wave filtering circuit simultaneously or the over-and under-voltage of under-voltage protection protects electricity
Road, when there is overvoltage or undervoltage condition, overvoltage crowbar or under-voltage protecting circuit are started to work, by outputs level signals extremely
In PWM controller, PWM controller will be off after receiving signal, and entire power supply realizes the mesh of overvoltage or under-voltage protection without output
, there is reasonable design, easy to use, as shown in Figure 1 and Figure 2, especially using following setting structures：It is provided with prime
Protect circuit, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage protection system
System, prime protection circuit connection prime current rectifying and wave filtering circuit, prime current rectifying and wave filtering circuit connection power conversion system, power conversion
System is connected with rear class output circuit, rear class output circuit connection PWM controller, PWM controller connection power conversion system；
Over-and under-voltage protection circuit is further included, reference voltage circuit, overvoltage crowbar, under-voltage is provided in over-and under-voltage protection circuit
Circuit is protected, input terminal of the reference voltage circuit respectively with under-voltage protecting circuit and overvoltage crowbar is connected, overvoltage
Protection circuit connects prime current rectifying and wave filtering circuit with under-voltage protecting circuit, overvoltage crowbar and under-voltage protecting circuit all with PWM
Controller is connected；Amplifier chip U1A, overvoltage detection input circuit, over-pressed benchmark input are provided in overvoltage crowbar
Circuit, prime current rectifying and wave filtering circuit detect the in-phase input end of input circuit connection amplifier chip U1A, reference voltage by overvoltage
The over-pressed benchmark input circuit of circuit connection, the inverting input of over-pressed benchmark input circuit connection amplifier chip U1A, amplifier chip
The output terminal of U1A is connected by diode D1 with PWM controller.Preferred diode D1 uses light emitting diode, and two poles
The output terminal of the anode connection amplifier chip U1A of pipe D1；Overvoltage protection or under-voltage protection are carried out using light emitting diode to control with PWM
Data transmission between device processed can allow user that can understand and know that protection circuit is starting to act.
In design in use, alternating current will be transmitted to after prime protects processing of circuit in prime current rectifying and wave filtering circuit
Rectification and filtering process are carried out, ripple voltage direct current output as few as possible is then obtained, is then existed by power conversion system
The conversion of energy part is carried out under the cooperation of PWM controller, signal power is converted to, is then exported by rear class output circuit, be
Circuit power supply to be powered；On prime current rectifying and wave filtering circuit set over-and under-voltage protect circuit, and pass through its to PWM controller into
Row control, when there is overvoltage or undervoltage condition, overvoltage crowbar or under-voltage protecting circuit are started to work, and output level is believed
Number in PWM controller, PWM controller will be off after receiving signal, realize the purpose of overvoltage or under-voltage protection.
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 setting structures：It is described overvoltage detection input circuit include resistance R1, resistance R2,
Resistance R3, resistance R4 and capacitance C1, the first end connection prime current rectifying and wave filtering circuit of resistance R1, the second end of resistance R1 respectively with
The first end of the first end of resistance R2, the first end of capacitance C1 and resistance R3 is connected, the second end of resistance R2 respectively with capacitance
The second end of C1 and the second end of resistance R4 are connected and are grounded, the second end of resistance R3 respectively with the first end and fortune of resistance R4
The in-phase input end for putting chip U1A is connected；The overvoltage benchmark input circuit includes resistance R6 and resistance R5, resistance R5 and electricity
Resistance R6 is serially connected, and the resistance R5 to connect connects the inverting input of amplifier chip U1A, resistance R5 with the connects end altogether of resistance R6
Non- connects end altogether ground connection, the output terminal of the non-connects end altogether connection reference voltage circuit of resistance R6, preferred reference voltage source passes through
The inverting input of resistance R6 connection amplifier chips U1A.
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 setting structures：The under-voltage protecting circuit includes amplifier chip U1B, owes
Pressure detection input circuit, under-voltage benchmark input circuit, the prime current rectifying and wave filtering circuit are connected by under-voltage detection input circuit
The inverting input of amplifier chip U1B, reference voltage circuit connect under-voltage benchmark input circuit, under-voltage benchmark input circuit connection
The in-phase input end of amplifier chip U1B, the output terminal of amplifier chip U1B are connected by diode D2 with PWM controller；It is preferred that
Diode D2 using light emitting diode, and the output terminal of the anode connection amplifier chip U1B of diode D2, using light-emitting diodes
Pipe carries out the data transmission between overvoltage protection or under-voltage protection and PWM controller, can allow user can understand know be
Any protection circuit is starting to act.
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 setting structures：The under-voltage detection input circuit includes resistance R7, resistance
R8, resistance R9, resistance R4 and capacitance C2, the first end connection prime current rectifying and wave filtering circuit of resistance R7, the second end point of resistance R7
First end not with the first end of resistance R8, the first end of capacitance C2 and resistance R9 is connected, the second end of resistance R8 respectively with
The second end of capacitance C2 and the second end of resistance R10 are connected and are grounded, the second end of resistance R9 respectively with resistance R10 first
End is connected with the inverting input of amplifier chip U1B；The under-voltage benchmark input circuit includes resistance R12 and resistance R11, electricity
Resistance R12 and resistance R11 is serially connected, and the resistance R11 to connect connects the same phase of amplifier chip U1B with the connects end altogether of resistance R12
Input terminal, the non-connects end altogether ground connection of resistance R11, the output terminal of the non-connects end altogether connection reference voltage circuit of resistance R12；Preferably
The in-phase input end that reference voltage source passes through resistance R12 connection amplifier chips U1B.
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 setting structures：The reference voltage circuit includes reference voltage source and phase
The zener diode Z1 and resistance R13 mutually to connect, and the output terminal connection overvoltage crowbar of reference voltage source and under-voltage protection
Circuit, reference voltage source are grounded by the zener diode Z1 and resistance R13 being serially connected.The preferred zener diode Z1
Anode connection resistance R13, zener diode DZ1 cathode connection reference voltage source output terminal, using voltage-stabiliser tube and benchmark
The matched pattern of voltage source is overvoltage crowbar or under-voltage protecting circuit by reference voltage, so that the stabilization of the two
Property and precision higher can effectively realize the purpose of overvoltage protection or/and under-voltage protection.
In setting, preferred amplifier chip U1A and amplifier chip U1B are all double using same using single amplifier or both
Two amplifier units in amplifier are realized.
When in use, the sampling voltage of overvoltage crowbar and under-voltage protecting circuit is all from the filter of prime current rectifying and wave filtering circuit
Voltage after wave；Sampling voltage is divided into two-way, is inputted after resistance R1, resistance R2, resistance R3, resistance R4 partial pressures all the way（Amplifier
Chip）The in-phase input end of comparator U1A, as sampling voltage is higher than the reference voltage of comparator U1A inverting inputs, comparator
The output terminal output high level of U1A goes control PWM controller to turn it off, and power supply achievees the purpose that overvoltage protection without output.Separately
It is inputted after resistance R7, resistance R8, resistance R9, resistance R10 partial pressures all the way（Amplifier chip）The inverting input of comparator U1B,
If sampling voltage is higher than the reference voltage of comparator U1B in-phase input ends, the output terminal output high level of comparator U1B goes to control
PWM controller turns it off, and power supply achievees the purpose that under-voltage protection without output.
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 setting structures：Benchmark is provided in the Current Voltage protection system
Signal circuit, voltage stabilization and current stabilization selection circuit, current feedback circuit, current-limiting circuit, current display circuit, voltage feedback circuit, limit
Volt circuit and voltage display circuit, the rear class output circuit connect current feedback circuit and voltage feedback circuit, electric current respectively
Feedback circuit and voltage feedback circuit all connect voltage stabilization and current stabilization selection circuit, and voltage stabilization and current stabilization selection circuit is connected with PWM controller
It connects, reference signal circuit connection voltage stabilization and current stabilization selection circuit, current display circuit is connected with current feedback circuit, and voltage is shown
Circuit is connected with voltage feedback circuit, current feedback circuit connection current-limiting circuit, voltage feedback circuit connection pressure limiting circuit, limit
Current circuit and pressure limiting circuit all connect PWM controller.Preferably, output circuit connects voltage feedback circuit and current feedback respectively
Circuit.
The voltage/current display circuit set in Current Voltage protection system can show output voltage/electricity in real time
Flow valuve, so as to user can real-time awareness whether in allowed limits supply the current/voltage value of DC power supply.
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 setting structures：Driving circuit, complete is provided in the power conversion system
Bridging parallel operation and transformer circuit are provided with rear class current rectifying and output circuit, PWM controls in the rear class output circuit
Device processed connects driving circuit, driving circuit connection full-bridge converter, full-bridge converter connection transformer circuit, transformer circuit company
Connect rear class current rectifying, rear class current rectifying connection output circuit.
In design in use, alternating current will be transmitted to after prime protects processing of circuit in prime current rectifying and wave filtering circuit
Rectification and filtering process are carried out, then obtains ripple voltage direct current output as few as possible, it then will be straight using full-bridge converter
The energy of stream power supply is converted to the signal power needed for load, and full-bridge converter at work, is carried out by driving circuit
Driving, realizes the conversion of power；The transformer circuit, is built using high frequency transformer, can be lost as far as possible it is small will be through
Progress rectification post filtering processing in the transformed power delivery to rear class current rectifying of energy is crossed, ripple voltage is obtained and to the greatest extent may be used
The few direct current output of energy then passes through the D.C. regulated power supply needed for output circuit output；Collection point is set on output circuit,
And the current value of acquisition and/or voltage value are transmitted on current feedback circuit or/and voltage feedback circuit, current feedback circuit
Current-limiting circuit and pressure limiting circuit will be delivered to respectively all the way with voltage feedback circuit, be delivered to voltage stabilization and current stabilization selection circuit all the way,
The voltage regulation signal value and current stabilization signal value that voltage stabilization and current stabilization selection circuit combination reference signal circuit is provided are so as to convey signal extremely
In PWM controller, PWM controller will drive corresponding current-limiting circuit or pressure limiting circuit to work, will when further the two works
The duty ratio of PWM controller is adjusted, the final voltage for realizing output or/and electric current in allowed limits, avoid defeated
Go out voltage or/and electric current is excessively high and damage circuit to be powered or damage the high frequency switch power in itself.
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 setting structures：Further include the overheat protector electricity being connected with PWM controller
Road, the temperature of the temperature sensor Simultaneous Monitoring driving circuit of the thermal-shutdown circuit, full-bridge converter and transformer circuit
Variation.
The thermal-shutdown circuit, in temperature sensor be arranged on driving circuit, full-bridge converter and transformer electricity
In the installing zone on road, the temperature information in the region can be monitored, when there is temperature anomaly, overheat protector can be carried out,
So that the duty ratio of PWM controller becomes smaller, so that the output of entire power supply reduces, it revert in the range of permission.
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 setting structures：It is also associated on the prime current rectifying and wave filtering circuit auxiliary
Power circuit is helped, and auxiliary power circuit, for electrical connection PWM controller, the reference voltage source also can be that auxiliary power circuit is defeated
The voltage gone out.
Individually electricity is directly taken out of prime current rectifying and wave filtering circuit using an auxiliary power circuit and is converted to PWM controller
Required working power, can avoid the working power of PWM controller is influenced by output circuit so that PWM controller energy
Enough work steady in a long-term improves the work validity of entire power supply.
Embodiment 10：
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 setting structures：The prime protection circuit includes lightning prevention circuit, surge
Suppression circuit and power-supply filter, the lightning prevention circuit connect surge restraint circuit, surge restraint circuit connection power filter
Device, power-supply filter are connected with the input terminal of prime current rectifying and wave filtering circuit.
The anti-lightning system when alternating current is accessed by anti-lightning system, in thunderstorm weather, can be produced lightning stroke
Raw high intensity transient voltage imports ground end, and entire power supply is avoided to be damaged；
The surge restraint circuit, when alternating current is in transmission, when the surge voltage in power grid is transferred on the circuit, energy
It is enough to remove various surge spikes so that the alternating current of sine wave state only to be transmitted in circuit, so as to avoid Hou Xiang electricity
It route and is damaged in surge effect；
The power-supply filter can avoid out-put supply is unstable caused by electromagnetic interference from happening.
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 (10)
1. the power-supply system based on over-and under-voltage design protection, it is characterised in that：It is provided with prime protection circuit, prime rectification filter
Wave circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage protection system, prime protection circuit connection
Prime current rectifying and wave filtering circuit, prime current rectifying and wave filtering circuit connection power conversion system, power conversion system and rear class output circuit
It is connected, rear class output circuit connection PWM controller, PWM controller connection power conversion system；Further include over-and under-voltage protection
Circuit, over-and under-voltage are protected in circuit and are provided with reference voltage circuit, overvoltage crowbar, under-voltage protecting circuit, the benchmark
Input terminal of the potential circuit respectively with under-voltage protecting circuit and overvoltage crowbar is connected, overvoltage crowbar and under-voltage protection
Circuit connects prime current rectifying and wave filtering circuit, and overvoltage crowbar and under-voltage protecting circuit are all connected with PWM controller；In overvoltage
Amplifier chip U1A, overvoltage detection input circuit, over-pressed benchmark input circuit, prime rectifying and wave-filtering electricity are provided in protection circuit
The in-phase input end of input circuit connection amplifier chip U1A is detected on road by overvoltage, and the over-pressed benchmark of reference voltage circuit connection is defeated
Enter circuit, the inverting input of over-pressed benchmark input circuit connection amplifier chip U1A, the output terminal of amplifier chip U1A passes through two
Pole pipe D1 is connected with PWM controller.
2. the power-supply system according to claim 1 based on over-and under-voltage design protection, it is characterised in that：The overvoltage inspection
It surveys input circuit and includes resistance R1, resistance R2, resistance R3, resistance R4 and capacitance C1, the first end connection prime rectification of resistance R1
Filter circuit, the second end of the resistance R1 first end phase with the first end of resistance R2, the first end of capacitance C1 and resistance R3 respectively
Connection, the second end of resistance R2 are connected and are grounded with the second end of the second end of capacitance C1 and resistance R4 respectively, resistance R3's
In-phase input end of the second end respectively with the first end of resistance R4 and amplifier chip U1A is connected；The overvoltage benchmark input electricity
Road includes resistance R6 and resistance R5, and resistance R5 and resistance R6 are serially connected, and the resistance R5 and the connects end altogether of resistance R6 that connect connect
Connect the inverting input of amplifier chip U1A, the non-connects end altogether ground connection of resistance R5, the non-connects end altogether connection reference voltage electricity of resistance R6
The output terminal on road.
3. the power-supply system according to claim 1 or 2 based on over-and under-voltage design protection, it is characterised in that：It is described to owe
Voltage protection circuit includes amplifier chip U1B, under-voltage detection input circuit, under-voltage benchmark input circuit, the prime rectifying and wave-filtering
Circuit connects the inverting input of amplifier chip U1B by under-voltage detection input circuit, and reference voltage circuit connects under-voltage benchmark
Input circuit, the in-phase input end of under-voltage benchmark input circuit connection amplifier chip U1B, the output terminal of amplifier chip U1B pass through
Diode D2 is connected with PWM controller.
4. the power-supply system according to claim 3 based on over-and under-voltage design protection, it is characterised in that：The under-voltage inspection
It surveys input circuit and includes resistance R7, resistance R8, resistance R9, resistance R4 and capacitance C2, the first end connection prime rectification of resistance R7
Filter circuit, the second end of the resistance R7 first end phase with the first end of resistance R8, the first end of capacitance C2 and resistance R9 respectively
Connection, the second end of resistance R8 are connected and are grounded with the second end of the second end of capacitance C2 and resistance R10 respectively, resistance R9's
Inverting input of the second end respectively with the first end of resistance R10 and amplifier chip U1B is connected；The under-voltage benchmark input electricity
Road includes resistance R12 and resistance R11, and resistance R12 and resistance R11 be serially connected, and the resistance R11 that connects and resistance R12 is total to
Connect the in-phase input end of end connection amplifier chip U1B, the non-connects end altogether ground connection of resistance R11, the non-connects end altogether linker of resistance R12
The output terminal of quasi- potential circuit.
5. the power-supply system based on over-and under-voltage design protection according to claims 1 or 2 or 4, it is characterised in that：It is described
Reference voltage circuit includes reference voltage source and the zener diode Z1 and resistance R13 that are serially connected, and reference voltage source is defeated
Outlet connects overvoltage crowbar and under-voltage protecting circuit, and reference voltage source passes through the zener diode Z1 and resistance that are serially connected
R13 is grounded.
6. the power-supply system based on over-and under-voltage design protection according to claims 1 or 2 or 4, it is characterised in that：Institute
It states and reference signal circuit, voltage stabilization and current stabilization selection circuit, current feedback circuit, current limliting electricity is provided in Current Voltage protection system
Road, current display circuit, voltage feedback circuit, pressure limiting circuit and voltage display circuit, the rear class output circuit connect respectively
Current feedback circuit and voltage feedback circuit, current feedback circuit and voltage feedback circuit all connect voltage stabilization and current stabilization selection circuit,
Voltage stabilization and current stabilization selection circuit is connected with PWM controller, reference signal circuit connection voltage stabilization and current stabilization selection circuit, electric current display electricity
Road is connected with current feedback circuit, and voltage display circuit is connected with voltage feedback circuit, current feedback circuit connection current limliting
Circuit, voltage feedback circuit connection pressure limiting circuit, current-limiting circuit and pressure limiting circuit all connect PWM controller.
7. the power-supply system based on over-and under-voltage design protection according to claims 1 or 2 or 4, it is characterised in that：It is described
Driving circuit, full-bridge converter and transformer circuit are provided in power conversion system, is provided in the rear class output circuit
Rear class current rectifying and output circuit, PWM controller connection driving circuit, driving circuit connection full-bridge converter, full-bridge
Converter connects transformer circuit, transformer circuit connection rear class current rectifying, rear class current rectifying connection output
Circuit.
8. the power-supply system according to claim 7 based on over-and under-voltage design protection, it is characterised in that：Further include with
The thermal-shutdown circuit that PWM controller is connected is the temperature sensor Simultaneous Monitoring driving circuit of the thermal-shutdown circuit, complete
The temperature change of bridging parallel operation and transformer circuit.
9. the power-supply system based on over-and under-voltage design protection according to claims 1 or 2 or 4 or 8, it is characterised in that：
Auxiliary power circuit is also associated on the prime current rectifying and wave filtering circuit, and auxiliary power circuit is for electrical connection PWM controller.
10. the power-supply system based on over-and under-voltage design protection according to claims 1 or 2 or 4 or 8, it is characterised in that：
The prime protection circuit includes lightning prevention circuit, surge restraint circuit and power-supply filter, the lightning prevention circuit connection wave
Gush suppression circuit, surge restraint circuit connection power-supply filter, the input terminal phase of power-supply filter and prime current rectifying and wave filtering circuit
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721720089.4U CN207559872U (en) | 2017-12-12 | 2017-12-12 | Power-supply system based on over-and under-voltage design protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721720089.4U CN207559872U (en) | 2017-12-12 | 2017-12-12 | Power-supply system based on over-and under-voltage design protection |
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| Publication Number | Publication Date |
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| CN207559872U true CN207559872U (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911038A (en) * | 2017-12-12 | 2018-04-13 | 成都爱特联科技有限公司 | Power-supply system based on over-and under-voltage design protection |
| CN112350281A (en) * | 2020-11-24 | 2021-02-09 | 西安军陶科技有限公司 | Anti-current surge power supply circuit and power supply equipment |
| CN113206494A (en) * | 2021-03-19 | 2021-08-03 | 成都市菱奇半导体有限公司 | Input voltage's detection circuitry and charger |
-
2017
- 2017-12-12 CN CN201721720089.4U patent/CN207559872U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911038A (en) * | 2017-12-12 | 2018-04-13 | 成都爱特联科技有限公司 | Power-supply system based on over-and under-voltage design protection |
| CN112350281A (en) * | 2020-11-24 | 2021-02-09 | 西安军陶科技有限公司 | Anti-current surge power supply circuit and power supply equipment |
| CN113206494A (en) * | 2021-03-19 | 2021-08-03 | 成都市菱奇半导体有限公司 | Input voltage's detection circuitry and charger |
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