CN107911038A - 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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- CN107911038A CN107911038A CN201711315832.2A CN201711315832A CN107911038A CN 107911038 A CN107911038 A CN 107911038A CN 201711315832 A CN201711315832 A CN 201711315832A CN 107911038 A CN107911038 A CN 107911038A
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The invention discloses the power-supply system 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 with over-and under-voltage protection circuit；Amplifier chip U1A is provided with 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 are engaged, 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, by in outputs level signals to PWM controller, PWM controller will be off after receiving signal, whole power supply is without output, realize the purpose of overvoltage or under-voltage protection.
Description
Technical field
The present invention relates to the fields such as power technology, PWM technologies, are the electricity based on over-and under-voltage design protection specifically
Source 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 to utilize modern power electronics technology, the time ratio that controlling switch pipe turns on and off, and remains steady
Determine a kind of power supply of output voltage, Switching Power Supply is generally by pulse width modulation（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
Deng field.
Pulse width modulation（PWM）It is a kind of non-come what is be controlled to analog circuit using the numeral output of microprocessor
Normal effective technology, is widely used in from measurement, many fields to communicate to Power Control with conversion.
Pulse width modulation is a kind of analog control mode, its according to the change 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 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 numeral using microprocessor
A kind of very effective technology that signal is controlled 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 resonance free ripple switching technique will become PWM control technologies develop master
Want one of direction.Its according to the change of respective loads come the biasing of modulation transistor base stage or metal-oxide-semiconductor grid, to realize transistor
Or the change of metal-oxide-semiconductor 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 analog circuit is controlled using the digital signal of microprocessor it is a kind of 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 varying the cycle of spike train
The width or duty cycle of punching can be such that voltage changes with frequency coordination with pressure regulation using suitable control method.Tune can be passed through
The cycle of whole PWM, the duty cycle 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 produced in the half period of output waveform, the threshold voltage that waits for making each pulse is 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
Size, can also change output frequency.
The content of the invention
It is an object of the invention to provide the power-supply system based on over-and under-voltage design protection, by prime protect circuit,
Prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage protection system are engaged,
Required regulated power supply is obtained, while setting can carry out Switching Power Supply over-pressed or under-voltage guarantor on prime current rectifying and wave filtering circuit
The over-and under-voltage protection circuit of shield, when there is overvoltage or undervoltage condition, overvoltage crowbar or under-voltage protecting circuit start work
Make, by outputs level signals to PWM controller, PWM controller will be off after receiving signal, and whole power supply is real without output
The purpose of existing overvoltage or under-voltage protection, has the characteristics that design is reasonable, easy to use.
The present invention is achieved through the following technical solutions：Based on the power-supply system of over-and under-voltage design protection, prime is provided with
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 with 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 with overvoltage crowbar
Circuit, prime current rectifying and wave filtering circuit connect the in-phase input end of amplifier chip U1A, reference voltage by overvoltage detection input circuit
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.
Further is that the present invention is better achieved, especially using following setting structures：The overvoltage detection input circuit
Including 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, electricity
The first end for hindering the second end first end with resistance R2, the first end of capacitance C1 and resistance R3 respectively of R1 is connected, resistance R2
Second end be connected and be grounded with the second end of capacitance C1 and the second end of resistance R4 respectively, the second end of resistance R3 respectively with
The first end of resistance R4 is connected with the in-phase input end of amplifier chip U1A；The overvoltage benchmark input circuit includes resistance R6
And resistance R5, resistance R5 and resistance R6 are serially connected, and the resistance R5 to connect connects amplifier chip U1A with the connects end altogether of resistance R6
Inverting input, resistance R5 non-connects end altogether ground connection, resistance R6 non-connects end altogether connection reference voltage circuit output terminal.
Further is that the present invention is better achieved, especially using following setting structures：The under-voltage protecting circuit includes
Amplifier chip U1B, under-voltage detection input circuit, under-voltage benchmark input circuit, the prime current rectifying and wave filtering circuit pass through under-voltage inspection
The inverting input of input circuit connection amplifier chip U1B is surveyed, reference voltage circuit connects under-voltage benchmark input circuit, under-voltage base
The in-phase input end of quasi- input circuit connection amplifier chip U1B, the output terminal of amplifier chip U1B are controlled by diode D2 and PWM
Device processed is connected.
Further is that the present invention is better achieved, especially using following setting structures：The under-voltage detection input circuit
Including 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, electricity
The first end for hindering the second end first end with resistance R8, the first end of capacitance C2 and resistance R9 respectively of R7 is connected, resistance R8
Second end be connected and be grounded with the second end of capacitance C2 and the second end of resistance R10 respectively, the second end of resistance R9 difference
It is connected with the first end of resistance R10 and the inverting input of amplifier chip U1B；The under-voltage benchmark input circuit includes resistance
R12 and resistance R11, resistance R12 and resistance R11 are serially connected, and the resistance R11 to connect connects fortune with the connects end altogether of resistance R12
Put the in-phase input end of chip U1B, the non-connects end altogether ground connection of resistance R11, the non-connects end altogether connection reference voltage circuit of resistance R12
Output terminal.
Further is that the present invention is better achieved, especially using following setting structures：The reference voltage circuit includes
Reference voltage source and the zener diode Z1 and resistance R13 being serially connected, and the output terminal connection overvoltage protection of reference voltage source
Circuit and under-voltage protecting circuit, reference voltage source are grounded by the zener diode Z1 and resistance R13 being serially connected.Preferable institute
State the output terminal of the anode connection reference voltage source of cathode connection the resistance R13, zener diode DZ1 of zener diode Z1.
Further is that the present invention is better achieved, especially using following setting structures：Protected in the Current Voltage and be
Reference signal circuit, voltage stabilization and current stabilization selection circuit, current feedback circuit, current-limiting circuit, current display circuit, electricity are provided with system
Pressure feedback circuit, pressure limiting circuit and voltage display circuit, the rear class output circuit connect current feedback circuit and voltage respectively
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 with
PWM controller is connected, reference signal circuit connection voltage stabilization and current stabilization selection circuit, current display circuit and current feedback circuit phase
Connection, voltage display circuit are connected with voltage feedback circuit, and current feedback circuit connection current-limiting circuit, voltage feedback circuit connects
Pressure limiting circuit is connect, current-limiting circuit and pressure limiting circuit all connect PWM controller.Preferably, output circuit connects Voltage Feedback respectively
Circuit and current feedback circuit.
Further is that the present invention is better achieved, especially using following setting structures：Set in the power conversion system
Drive circuit, full-bridge converter and transformer circuit are equipped with, rear class current rectifying is provided with the rear class output circuit
And output circuit, PWM controller connection drive circuit, drive circuit connection full-bridge converter, full-bridge converter connection transformer
Circuit, transformer circuit connection rear class current rectifying, rear class current rectifying connection output circuit.
Further is that the present invention is better achieved, especially using following setting structures：Further include and be connected with PWM controller
The thermal-shutdown circuit connect, temperature sensor Simultaneous Monitoring drive circuit, full-bridge converter and the change of the thermal-shutdown circuit
The temperature change of transformer circuits.
Further is that the present invention is better achieved, especially using following setting structures：In prime rectifying and wave-filtering electricity
Auxiliary power circuit is also associated with road, and auxiliary power circuit is for being electrically connected PWM controller.
Further is that the present invention is better achieved, especially using following setting structures：The prime protection circuit includes
Lightning prevention circuit, surge restraint circuit and power-supply filter, the lightning prevention circuit connect surge restraint circuit, Surge suppression electricity
Road connects power-supply filter, and power-supply filter is connected with the input terminal of prime current rectifying and wave filtering circuit.
Compared with prior art, the present invention haing the following advantages and beneficial effect：
The present invention protects circuit, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class to export electricity by prime
Road and Current Voltage protection system are engaged, and obtain required regulated power supply, while set energy on prime current rectifying and wave filtering circuit
Enough over-and under-voltage protection circuits that overvoltage or under-voltage protection are carried out to Switching Power Supply, when there is overvoltage or undervoltage condition, overvoltage
Circuit or under-voltage protecting circuit is protected to start to work, by outputs level signals to PWM controller, PWM controller receives signal
After will be off, whole power supply realizes the purpose of overvoltage or under-voltage protection without output, has and designs the spy such as reasonable, easy to use
Point.
The present invention sets the Current Voltage protection system with defencive function on power output end, can be when exporting
In the case of overcurrent or/and overvoltage, carry out automatic protection so that output current or voltage in allowed limits, avoid due to
The situation that overcurrent or overvoltage cause circuit to be powered to be burned out occurs.
The present invention sets current display circuit in Current Voltage protection system, can display output current value in real time,
So as to user can real-time awareness whether in allowed limits supply the current value of DC power supply, have design rationally, make
The features such as with facilitating.
Surge restraint circuit set by the present invention can effectively suppress the surge voltage in alternating current, avoid surge electric
Pressure causes to damage to whole circuit.
Various protection circuits set by the present invention can change by varying the duty cycle of PWM controller so as to reach
Become the purpose of output voltage.
The present invention uses voltage-stabiliser tube and the matched pattern of reference voltage source as overvoltage crowbar or under-voltage protecting circuit
By reference voltage, so that both stability and precision higher, can effectively realize overvoltage protection or/and under-voltage guarantor
The purpose of shield.
The thermal-shutdown circuit that the present invention is set can work as drive circuit or/and full-bridge converter or/and transformer circuit
When there is temperature anomaly, overheat protector is carried out so that the duty cycle of PWM controller diminishes, so that the output of whole power supply
Reduce, revert in the range of permission.
The voltage display circuit that is set in Current Voltage protection system of the present invention, being capable of display output voltage in real time
Value, so as to user can real-time awareness whether in allowed limits supply the electric current pressure value of DC power supply.
The present invention carries out the data transfer between overvoltage protection or under-voltage protection and PWM controller using light emitting diode,
User can be allowed to understand and know that what protection circuit is starting to act.
The present invention individually directly takes electricity using an auxiliary power circuit out of prime current rectifying and wave filtering circuit and is converted to PWM
The required working power of controller, can avoid the working power of PWM controller is influenced by output circuit so that PWM is controlled
Device processed can be steady in a long-term work, improve the work validity of whole power supply.
The present invention carries out signal acquisition by the outlet side in prime current rectifying and wave filtering circuit so that entirely circuit structure is steady
Qualitative higher.
The present invention is designed using various kinds of protective circuit, can be when there is overvoltage, overcurrent or under-voltage condition, all can be steady
Fixed operation, has the features such as working stability, safe to use.
Brief description of the drawings
Fig. 1 is principle of the invention block diagram.
Fig. 2 protects circuit diagram for over-and under-voltage of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not 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 is protected to control by prime
Device, power conversion system, rear class output circuit and Current Voltage protection system are engaged, and obtain required regulated power supply, at the same time
Switching Power Supply can be carried out in the over-and under-voltage protection circuit of overvoltage or under-voltage protection by being set on prime current rectifying and wave filtering circuit, when
When there is overvoltage or undervoltage condition, overvoltage crowbar or under-voltage protecting circuit are started to work, and outputs level signals to PWM are controlled
On device processed, PWM controller will be off after receiving signal, and whole power supply is realized the purpose of overvoltage or under-voltage protection, had without output
There is the features such as design is reasonable, easy to use, as shown in Figure 1 and Figure 2, especially using following setting structures：It is provided with prime protection electricity
Road, prime current rectifying and wave filtering circuit, PWM controller, power conversion system, rear class output circuit and Current Voltage protection system, it is preceding
Level protection circuit connection prime current rectifying and wave filtering circuit, prime current rectifying and wave filtering circuit connection power conversion system, power conversion system
It is connected with rear class output circuit, rear class output circuit connection PWM controller, PWM controller connection power conversion system；Also wrap
Over-and under-voltage protection circuit is included, reference voltage circuit, overvoltage crowbar, under-voltage protection are provided with over-and under-voltage protection circuit
Circuit, input terminal of the reference voltage circuit respectively with under-voltage protecting circuit and overvoltage crowbar are connected, overvoltage protection
Circuit connects prime current rectifying and wave filtering circuit with under-voltage protecting circuit, and overvoltage crowbar and under-voltage protecting circuit are all controlled with PWM
Device is connected；Amplifier chip U1A, overvoltage detection input circuit, over-pressed benchmark input circuit are provided with overvoltage crowbar,
Prime current rectifying and wave filtering circuit connects the in-phase input end of amplifier chip U1A, reference voltage circuit by overvoltage detection input circuit
The over-pressed benchmark input circuit of connection, the inverting input of over-pressed benchmark input circuit connection amplifier chip U1A, amplifier chip U1A
Output terminal be connected by diode D1 with PWM controller.Preferable diode D1 uses light emitting diode, and diode D1
Cathode connection amplifier chip U1A output terminal；Overvoltage protection or under-voltage protection and PWM controller are carried out using light emitting diode
Between data transfer, can allow user can understand know what protection circuit starting to act.
In design in use, alternating current will be transmitted in prime current rectifying and wave filtering circuit after prime protects processing of 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 by 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, as shown in Figure 1 and Figure 2, further to be preferably real
The existing present invention, especially using following setting structures：The overvoltage detection input circuit includes resistance R1, resistance R2, resistance R3, electricity
R4 and capacitance C1 is hindered, the first end connection prime current rectifying and wave filtering circuit of resistance R1, the second end of resistance R1 is respectively with resistance R2's
The first end of first end, the first end of capacitance C1 and resistance R3 is connected, the second end of resistance R2 respectively with capacitance C1 second
End and the second end of resistance R4 are connected and are grounded, the second end of the resistance R3 first end and amplifier chip with resistance R4 respectively
The in-phase input end of U1A is connected；The overvoltage benchmark input circuit includes resistance R6 and resistance R5, resistance R5 and resistance R6 phases
Mutually series connection, and the resistance R5 to connect connects the inverting input of amplifier chip U1A with the connects end altogether of resistance R6, resistance R5's is non-common
End ground connection, the output terminal of the non-connects end altogether connection reference voltage circuit of resistance R6 are connect, preferable reference voltage source passes through resistance R6
Connect the inverting input of amplifier chip U1A.
Embodiment 3：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：The under-voltage protecting circuit is defeated including amplifier chip U1B, under-voltage detection
Enter circuit, under-voltage benchmark input circuit, the prime current rectifying and wave filtering circuit connects amplifier chip by under-voltage detection input circuit
The inverting input of U1B, reference voltage circuit connect under-voltage benchmark input circuit, and under-voltage benchmark input circuit connects amplifier chip
The in-phase input end of U1B, the output terminal of amplifier chip U1B are connected by diode D2 with PWM controller；Preferable diode
D2 uses light emitting diode, and the output terminal of the cathode connection amplifier chip U1B of diode D2, is carried out using light emitting diode
Pressure protection or the data transfer between under-voltage protection and PWM controller, can allow user to understand what protection knows is
Circuit is starting to act.
Embodiment 4：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, 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 of resistance R7 respectively with resistance
The first end of the first end of R8, the first end of capacitance C2 and resistance R9 is connected, and the second end of resistance R8 is respectively with capacitance C2's
Second end and the second end of resistance R10 are connected and are grounded, the second end of the resistance R9 first end and amplifier with resistance R10 respectively
The inverting input of chip U1B is connected；The under-voltage benchmark input circuit includes resistance R12 and resistance R11, resistance R12 and
Resistance R11 is serially connected, and the resistance R11 to connect connects the in-phase input end of amplifier chip U1B with the connects end altogether of resistance R12,
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；Preferable benchmark electricity
The in-phase input end that potential source passes through resistance R12 connection amplifier chips U1B.
Embodiment 5：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：The reference voltage circuit includes reference voltage source and is serially connected
Zener diode Z1 and resistance R13, and the output terminal connection overvoltage crowbar and under-voltage protecting circuit of reference voltage source, benchmark
Voltage source is grounded by the zener diode Z1 and resistance R13 being serially connected.The cathode of the preferable zener diode Z1 connects
The output terminal of the anode connection reference voltage source of connecting resistance R13, zener diode DZ1, using voltage-stabiliser tube and reference voltage source phase
The pattern of cooperation is overvoltage crowbar or under-voltage protecting circuit by reference voltage, so that both stability and precision
Higher, can effectively realize the purpose of overvoltage protection or/and under-voltage protection.
When setting, preferable 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 ripple；Sampling voltage is divided into two-way, is inputted all the way after resistance R1, resistance R2, resistance R3, resistance R4 partial pressures（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
Inputted all the way after resistance R7, resistance R8, resistance R9, resistance R10 partial pressures（Amplifier chip）The inverting input of comparator U1B,
Such as reference voltage of the sampling voltage higher than 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 further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：Be provided with the Current Voltage protection system reference signal circuit,
Voltage stabilization and current stabilization selection circuit, current feedback circuit, current-limiting circuit, current display circuit, voltage feedback circuit, pressure limiting circuit and electricity
Press display circuit, the rear class output circuit connects current feedback circuit and voltage feedback circuit respectively, current feedback circuit and
Voltage feedback circuit all connects voltage stabilization and current stabilization selection circuit, and voltage stabilization and current stabilization selection circuit is connected with PWM controller, reference signal
Circuit connects voltage stabilization and current stabilization selection circuit, and current display circuit is connected with current feedback circuit, voltage display circuit and voltage
Feedback circuit is connected, current feedback circuit connection current-limiting circuit, voltage feedback circuit connection pressure limiting circuit, current-limiting circuit and limit
Volt circuit all connects PWM controller.Preferably, output circuit connects voltage feedback circuit and current feedback circuit respectively.
The voltage/current display circuit set in Current Voltage protection system, being capable of display 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 further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：Drive circuit, full-bridge converter are provided with the power conversion system
And transformer circuit, rear class current rectifying and output circuit, PWM controller connection are provided with the rear class output circuit
Drive circuit, drive circuit connection full-bridge converter, full-bridge converter connection transformer circuit, transformer circuit connection rear class are whole
Flow filter circuit, rear class current rectifying connection output circuit.
In design in use, alternating current will be transmitted in prime current rectifying and wave filtering circuit after prime protects processing of circuit
Rectification and filtering process are carried out, then obtains ripple voltage direct current output as few as possible, 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 drive 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 of energy to rear class current rectifying 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 collection and/or magnitude of voltage 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 further during both work
The duty cycle 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 excessive and damage circuit to be powered or damage the high frequency switch power in itself.
Embodiment 8：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：The thermal-shutdown circuit being connected with PWM controller is further included, it is described
The temperature change of the temperature sensor Simultaneous Monitoring drive circuit of thermal-shutdown circuit, full-bridge converter and transformer circuit.
The thermal-shutdown circuit, the temperature sensor in it are arranged on drive 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 cycle of PWM controller diminishes, so that the output of whole power supply reduces, it revert in the range of permission.
Embodiment 9：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：Accessory power supply electricity is also associated with the prime current rectifying and wave filtering circuit
Road, and auxiliary power circuit also can be the electricity of auxiliary power circuit output for being electrically connected PWM controller, the reference voltage source
Pressure.
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 whole power supply.
Embodiment 10：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：The prime protection circuit includes lightning prevention circuit, surge restraint circuit
And power-supply filter, the lightning prevention circuit connect surge restraint circuit, surge restraint circuit connection power-supply filter, power supply filter
Ripple device is 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, avoids whole power supply from being damaged；
The surge restraint circuit, when alternating current is in transmission, when the surge voltage in power grid is transferred on the circuit, can incite somebody to action
Various surge spikes remove so that the alternating current of sine wave state is simply transmitted in circuit so that avoid Hou Xiang circuits by
Damaged in surge effect；
The power-supply filter, can avoid the situation that out-put supply is unstable caused by electromagnetic interference from occurring.
The above, is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is every according to
Any simply modification, the equivalent variations made according to the technical spirit of the present invention to above example, each fall within the protection of the present invention
Within the scope of.
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 with protection circuit
Road connects the in-phase input end of amplifier chip U1A by overvoltage detection input circuit, 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
Surveying input circuit includes resistance R1, resistance R2, resistance R3, resistance R4 and capacitance C1, the first end connection prime rectification of resistance R1
Filter circuit, the first end phase of the second end of resistance the R1 first end with 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 capacitance C1 and the second end of resistance R4 respectively, resistance R3's
Second end is connected with the first end of resistance R4 and the in-phase input end of amplifier chip U1A respectively；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
Surveying input circuit includes resistance R7, resistance R8, resistance R9, resistance R4 and capacitance C2, the first end connection prime rectification of resistance R7
Filter circuit, the first end phase of the second end of resistance the R7 first end with 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 capacitance C2 and the second end of resistance R10 respectively, resistance R9's
Second end is connected with the first end of resistance R10 and the inverting input of amplifier chip U1B respectively；The under-voltage benchmark input electricity
Road includes resistance R12 and resistance R11, resistance R12 and resistance R11 are serially connected, and the resistance R11 and resistance R12 that connect are 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. according to the power-supply system based on over-and under-voltage design protection described in claim 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. according to the power-supply system based on over-and under-voltage design protection described in claim 1 or 2 or 4, it is characterised in that：Institute
State and reference signal circuit, voltage stabilization and current stabilization selection circuit, current feedback circuit, current limliting electricity are provided with 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. according to the power-supply system based on over-and under-voltage design protection described in claim 1 or 2 or 4, it is characterised in that：It is described
Drive circuit, full-bridge converter and transformer circuit are provided with power conversion system, is provided with the rear class output circuit
Rear class current rectifying and output circuit, PWM controller connection drive circuit, drive 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 drive circuit of the thermal-shutdown circuit, complete
The temperature change of bridging parallel operation and transformer circuit.
9. according to the power-supply system based on over-and under-voltage design protection described in claim 1 or 2 or 4 or 8, it is characterised in that：
Auxiliary power circuit is also associated with the prime current rectifying and wave filtering circuit, and auxiliary power circuit is for being electrically connected PWM controller.
10. according to the power-supply system based on over-and under-voltage design protection described in claim 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 |
|---|---|---|---|
| CN201711315832.2A CN107911038A (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 |
|---|---|---|---|
| CN201711315832.2A CN107911038A (en) | 2017-12-12 | 2017-12-12 | Power-supply system based on over-and under-voltage design protection |
Publications (1)
| Publication Number | Publication Date |
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| CN107911038A true CN107911038A (en) | 2018-04-13 |
Family
ID=61865494
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711315832.2A Withdrawn CN107911038A (en) | 2017-12-12 | 2017-12-12 | Power-supply system based on over-and under-voltage design protection |
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| CN (1) | CN107911038A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544946A (en) * | 2019-09-27 | 2019-12-06 | 国网山东省电力公司济南市历城区供电公司 | Constant voltage power supply remote end power supply compensating system |
| CN111245210A (en) * | 2019-12-31 | 2020-06-05 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Construction method of high-power high-efficiency direct-current power supply |
| CN112290893A (en) * | 2020-11-07 | 2021-01-29 | 山西大学 | Low-noise broadband high-voltage amplifier |
| CN112865273A (en) * | 2021-01-20 | 2021-05-28 | 高鸣源 | Turnout connecting pin vibration energy collecting circuit, module and system |
| CN113141104A (en) * | 2020-01-17 | 2021-07-20 | 中车株洲电力机车研究所有限公司 | Power panel |
| CN113783458A (en) * | 2021-11-10 | 2021-12-10 | 国网江苏省电力有限公司营销服务中心 | Constant-voltage PWM (pulse-width modulation) direct-current high-voltage generating device and method based on PID (proportion integration differentiation) control |
| CN114035637A (en) * | 2021-11-16 | 2022-02-11 | 中国电子科技集团公司第二十四研究所 | Starting power supply circuit, power supply method of starting power supply circuit and starting power supply device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166194A (en) * | 2011-12-17 | 2013-06-19 | 西安恒飞电子科技有限公司 | Input overvoltage and under-voltage protection circuit of communication power supply module |
| CN104216456A (en) * | 2014-09-16 | 2014-12-17 | 黄通领 | Highly-efficient linear energy-saving DC stabilized power supply |
| CN104638608A (en) * | 2013-11-06 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN105305797A (en) * | 2015-10-15 | 2016-02-03 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage and undervoltage protection circuit for output of DC/DC power supply |
| CN205565678U (en) * | 2016-04-27 | 2016-09-07 | 卢芃翰 | Overvoltage protector |
| CN206272334U (en) * | 2016-11-15 | 2017-06-20 | 江西华伍制动器股份有限公司 | Automatically switch and circuit is set in railway traffic vehicle source |
| CN207559872U (en) * | 2017-12-12 | 2018-06-29 | 成都爱特联科技有限公司 | Power-supply system based on over-and under-voltage design protection |
-
2017
- 2017-12-12 CN CN201711315832.2A patent/CN107911038A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166194A (en) * | 2011-12-17 | 2013-06-19 | 西安恒飞电子科技有限公司 | Input overvoltage and under-voltage protection circuit of communication power supply module |
| CN104638608A (en) * | 2013-11-06 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN104216456A (en) * | 2014-09-16 | 2014-12-17 | 黄通领 | Highly-efficient linear energy-saving DC stabilized power supply |
| CN105305797A (en) * | 2015-10-15 | 2016-02-03 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage and undervoltage protection circuit for output of DC/DC power supply |
| CN205565678U (en) * | 2016-04-27 | 2016-09-07 | 卢芃翰 | Overvoltage protector |
| CN206272334U (en) * | 2016-11-15 | 2017-06-20 | 江西华伍制动器股份有限公司 | Automatically switch and circuit is set in railway traffic vehicle source |
| CN207559872U (en) * | 2017-12-12 | 2018-06-29 | 成都爱特联科技有限公司 | Power-supply system based on over-and under-voltage design protection |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544946A (en) * | 2019-09-27 | 2019-12-06 | 国网山东省电力公司济南市历城区供电公司 | Constant voltage power supply remote end power supply compensating system |
| CN111245210A (en) * | 2019-12-31 | 2020-06-05 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Construction method of high-power high-efficiency direct-current power supply |
| CN113141104A (en) * | 2020-01-17 | 2021-07-20 | 中车株洲电力机车研究所有限公司 | Power panel |
| CN112290893A (en) * | 2020-11-07 | 2021-01-29 | 山西大学 | Low-noise broadband high-voltage amplifier |
| CN112865273A (en) * | 2021-01-20 | 2021-05-28 | 高鸣源 | Turnout connecting pin vibration energy collecting circuit, module and system |
| CN112865273B (en) * | 2021-01-20 | 2023-09-12 | 成都铁工科技有限公司 | Switch connecting pin vibration energy collection circuit, module and system |
| CN113783458A (en) * | 2021-11-10 | 2021-12-10 | 国网江苏省电力有限公司营销服务中心 | Constant-voltage PWM (pulse-width modulation) direct-current high-voltage generating device and method based on PID (proportion integration differentiation) control |
| CN114035637A (en) * | 2021-11-16 | 2022-02-11 | 中国电子科技集团公司第二十四研究所 | Starting power supply circuit, power supply method of starting power supply circuit and starting power supply device |
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