CN107911037A - A kind of strong switching power supply of job stability - Google Patents
A kind of strong switching power supply of job stability Download PDFInfo
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- CN107911037A CN107911037A CN201711310951.9A CN201711310951A CN107911037A CN 107911037 A CN107911037 A CN 107911037A CN 201711310951 A CN201711310951 A CN 201711310951A CN 107911037 A CN107911037 A CN 107911037A
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Classifications
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- 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
- 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
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of strong switching power supply of job stability,It is provided with pre-error input circuitry,Power conversion circuit,Second current rectifying and wave filtering circuit,Output circuit,Postposition output circuit,Current-limiting protection circuit and pwm control circuit,The current-limiting protection circuit includes photoelectric coupled circuit,Transistor circuit,Indicator light circuit and comparator circuit,The output circuit connects comparator circuit,Comparator circuit connects transistor circuit by indicator light circuit,Transistor circuit is connected with pwm control circuit,Using comparator circuit to the sampled signal of output circuit collected compared with reference voltage,Then it is output to by indicator light circuit in transistor circuit,Acted on again by transistor circuit in photoelectric coupled circuit,So that optocoupler works,So as to provide a triggering level for pwm control circuit,So that pwm control circuit carries out duty cycle adjustment.
Description
Technical field
The present invention relates to the fields such as power technology, PWM technologies, are that a kind of strong switch of job stability is steady specifically
Voltage source.
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 a kind of strong switching power supply of job stability, it is provided with output circuit
For detecting whether there are output current to exceed design load, and it is that can carry out the current-limiting protection of protection act when exceeding design load
Circuit, when detecting that the output current at output circuit is higher than design load, starts current-limiting protection circuit work, and load one
On trigger signal to pwm control circuit, so that the duty cycle of pwm control circuit diminishes, so that whole power supply is defeated
Go out voltage reduction, achieve the purpose that output overloading current limliting, avoid the output power supply instability because output circuit（Electric current is excessive,
Magnitude of voltage is too high or too low etc.）Situation occur, avoid load cause the situation of operation irregularity to be sent out due to unstable power supply
It is raw, using comparator circuit to the sampled signal of output circuit collected compared with reference voltage, then pass through instruction
Circuit for lamp is output in transistor circuit, then is acted on by transistor circuit in photoelectric coupled circuit so that optocoupler works, so as to be
Pwm control circuit provides a triggering level so that pwm control circuit carries out duty cycle adjustment（Duty cycle diminishes）.
The present invention is achieved through the following technical solutions：A kind of strong switching power supply of job stability, is provided with preposition
Input circuit, power conversion circuit, the second current rectifying and wave filtering circuit, output circuit, postposition output circuit, current-limiting protection circuit and
Pwm control circuit, the pre-error input circuitry connect power conversion circuit, and power conversion circuit connects the second rectifying and wave-filtering electricity
Road, the second current rectifying and wave filtering circuit connection output circuit, output circuit connection current-limiting protection circuit, current-limiting protection circuit connection PWM
Control circuit；The current-limiting protection circuit includes photoelectric coupled circuit, transistor circuit, indicator light circuit and comparator circuit, described
Output circuit connects comparator circuit, and comparator circuit connects transistor circuit, transistor circuit and PWM by indicator light circuit
Control circuit is connected.
Further is that the present invention is better achieved, especially using following set-up modes：Set in the comparator circuit
There are resistance R4, resistance R5, resistance R6, capacitance C1, capacitance C2, capacitance C3, diode D2 and amplifier chip UI2, output circuit
Current-limiting protection monitoring point is connected to by resistance R7 on the in-phase input end of amplifier chip UI2, and capacitance C3 and diode D2 are mutual
Parallel connection, and diode D2 after parallel connection and capacitance C3 are connected between output circuit current-limiting protection monitoring point and ground, amplifier chip
The inverting input of UI2 is grounded by the resistance R5 and resistance R6 being serially connected, and resistance R6 is connected with the connects end altogether of resistance R5
Reference voltage V ref；The inverting input of amplifier chip UI2 connects amplifier chip by the capacitance C1 being serially connected with resistance R4
The output terminal of UI2, capacitance C2 are connected in parallel between the inverting input and output terminal of amplifier chip UI2, and amplifier chip UI2 passes through finger
Indication lamp circuit connects transistor circuit.
The plus earth of preferable diode D2, one end of capacitance C1 is connected with the output terminal of amplifier chip UI2.
Further is that the present invention is better achieved, especially using following set-up modes：Set in the indicator light circuit
The diode D1 and resistance R2 being serially connected are equipped with, and the output signal of amplifier chip UI2 is entered by the cathode of diode D1
After be transported in transistor circuit；The transistor circuit includes resistance R3 and transistor Q1, and photoelectric coupled circuit includes opto-coupler chip
The cathode of photodiode passes through in resistance R1 connections power supply VCC, opto-coupler chip UI1 in UI1 and resistance R1, opto-coupler chip UI1
The collector connection pwm control circuit of phototriode, the emitter ground connection of phototriode, optocoupler core in opto-coupler chip UI1
The collector of the anode connection transistor Q1 of photodiode, the base stage of transistor Q1 are grounded by resistance R3 in piece UI1, and brilliant
The base stage and indicator light circuit of body pipe Q1（Resistance R2）It is connected, the emitter ground connection of transistor Q1.
Preferable diode D1 uses light emitting diode, and the output terminal of the cathode connection amplifier chip UI2 of diode D1.
Further is that the present invention is better achieved, especially using following set-up modes：In the pre-error input circuitry
It is provided with transformer circuit, the first current rectifying and wave filtering circuit, temperature sensor, overheating protection circuit and the fan electricity of interconnection
Road, the transformer circuit connect the first current rectifying and wave filtering circuit, the first current rectifying and wave filtering circuit connection power conversion circuit, the temperature
Degree sensor is arranged on transformer circuit and is connected with overheating protection circuit, overheating protection circuit connection fan circuit, wind
Fan the independent air feed of circuit and detect the state of temperature of transformer in transformer circuit to transformer circuit, temperature sensor.
Further is that the present invention is better achieved, especially using following set-up modes：Further include input overvoltage/undervoltage protection
Circuit and circuit of power factor correction, first current rectifying and wave filtering circuit connect respectively input over under-voltage protection circuit and power because
Number correcting circuit, input over under-voltage protection circuit connection circuit of power factor correction, circuit of power factor correction and inputted owe
Voltage protection circuit is all connected with power conversion circuit.
Further is that the present invention is better achieved, especially using following set-up modes：Controlled in the output circuit and PWM
Sampling comparison system is also associated between circuit processed, the sampling comparison system includes sample circuit and regulator circuit, described defeated
Go out circuit connection sample circuit, sample circuit regulator circuit, regulator circuit connection connection pwm control circuit.
Further is that the present invention is better achieved, especially using following set-up modes：Short-circuit protection circuit is further included, institute
State sample circuit connection short-circuit protection circuit, short-circuit protection circuit connection pwm control circuit.
Further is that the present invention is better achieved, especially using following set-up modes：Further include output over-voltage protection electricity
Road, and output circuit connection output overvoltage protection circuit, output overvoltage protection circuit connection pwm control circuit.
Further is that the present invention is better achieved, especially using following set-up modes：The PWM of the pwm control circuit
Main control chip uses UC3842.
Compared with prior art, the present invention haing the following advantages and beneficial effect：
The present invention is provided with output circuit for detecting whether there are output current to exceed design load, and works as and exceed design load
It is the current-limiting protection circuit that can carry out protection act, when detecting that the output current at output circuit is higher than design load, opens
Dynamic current-limiting protection circuit work, and load on trigger signal a to pwm control circuit, so that pwm control circuit accounts for
Empty ratio diminishes, so that the output voltage of whole power supply reduces, achievees the purpose that output overloading current limliting, avoids because output electricity
The output power supply instability on road（Electric current is excessive, magnitude of voltage is too high or too low etc.）Situation occur, avoid load due to unstable
Power supply and cause the situation of operation irregularity to occur, utilize sampled signal and base of the comparator circuit to the output circuit collected
Quasi- voltage is compared, and is then output to by indicator light circuit in transistor circuit, then acts on light by transistor circuit
On coupling circuit so that optocoupler works, so as to provide a triggering level for pwm control circuit so that pwm control circuit is accounted for
Sky is than adjustment（Duty cycle diminishes）.
Indicator light circuit set by the present invention not only acts as the effect of signal transmission, additionally it is possible to plays the work of indicator light
With, when output circuit is there are during overcurrent condition, power conversion circuit work, it indicates that lamp is lit so that user can and
There is a situation where overcurrent in Shi Zhixiao circuits.
The present invention realizes that overcurrent protection drive signal is transferred to PWM control circuits using optocoupler, can reach transmission
The purpose of signal, while can also realize isolating between pwm control circuit and current foldback circuit, avoid being formed between the two
Signal interference and the even running for influencing whole circuit.
The present invention is designed using various kinds of protective circuit, can be when there is short circuit, overvoltage or under-voltage condition, all can be steady
Fixed operation, has the features such as working stability, safe to use.
Overheat protecting system set by the present invention in real time can be monitored the temperature of transformer, and utilize overheat
Circuit control fan circuit is protected to carry out automatic air feed, so that the temperature at transformer circuit reduces, reaching reduces the mould
The purpose of block fever, and after permission temperature range is appeared in, overheating protection circuit will send shut-off instruction and arrives fan circuit again
On so that fan circuit is automatically stopped operation, plays energy saving purpose.
Brief description of the drawings
Fig. 1 is principle of the invention block diagram.
Fig. 2 is current foldback circuit figure 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.
To make the purpose, technical scheme and advantage of embodiment of the present invention clearer, implement below in conjunction with the present invention
Attached drawing in mode, is clearly and completely described the technical solution in embodiment of the present invention, it is clear that described reality
The mode of applying is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained without creative efforts, belongs to the present invention
The scope of protection.Therefore, below the detailed description of the embodiments of the present invention to providing in the accompanying drawings be not intended to limit will
The scope of the present invention of protection is sought, but is merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained without creative efforts, belongs to this
Invent the scope of protection.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ",
The orientation or position relationship of the instructions such as " clockwise ", " counterclockwise " be based on orientation shown in the drawings or position relationship, be only for
Easy to the description present invention and simplify description, rather than instruction or imply that signified equipment or element there must be specific side
Position, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, " multiple " are meant that two or more,
Unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be machinery
Connection or electrical connection；It can be directly connected, can also be indirectly connected by intermediary, can be two elements
Internal connection or the interaction relationship of two elements.For the ordinary skill in the art, can be according to specific
Situation understands the concrete meaning of above-mentioned term in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or it " under "
Can directly it be contacted including the first and second features, it is not directly to contact but pass through it that can also include the first and second features
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " to include first special
Sign is directly over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " fisrt feature that includes are immediately below second feature and obliquely downward, or be merely representative of
Fisrt feature level height is less than second feature.
Embodiment 1：
A kind of strong switching power supply of job stability, is provided with output circuit for detecting whether there are output current
That can carry out the current-limiting protection circuit of protection act more than design load, and when exceeding design load, when detecting at output circuit
Output current when being higher than design load, start current-limiting protection circuit work, and load a trigger signal to pwm control circuit
On, so that the duty cycle of pwm control circuit diminishes, so that the output voltage of whole power supply reduces, reach and exported
The purpose of current limliting is carried, avoids the output power supply instability because output circuit（Electric current is excessive, magnitude of voltage is too high or too low etc.）'s
Situation occurs, and avoids load from causing the situation of operation irregularity to occur due to unstable power supply, using comparator circuit to adopting
The sampled signal of the output circuit collected is then output to transistor circuit compared with reference voltage by indicator light circuit
In, then acted in photoelectric coupled circuit by transistor circuit so that optocoupler works, and is touched so as to provide one for pwm control circuit
Power generation is flat so that pwm control circuit carries out duty cycle adjustment（Duty cycle diminishes）, as shown in Figure 1 and Figure 2, especially set using following
Put structure：It is provided with pre-error input circuitry, power conversion circuit, the second current rectifying and wave filtering circuit, output circuit, postposition output electricity
Road, current-limiting protection circuit and pwm control circuit, the pre-error input circuitry connect power conversion circuit, and power conversion circuit connects
Connect the second current rectifying and wave filtering circuit, the second current rectifying and wave filtering circuit connection output circuit, output circuit connection current-limiting protection circuit, current limliting
Protect circuit connection pwm control circuit；The current-limiting protection circuit include photoelectric coupled circuit, transistor circuit, indicator light circuit and
Comparator circuit, the output circuit connect comparator circuit, and comparator circuit connects transistor circuit by indicator light circuit,
Transistor circuit is connected with pwm control circuit.
After the processing such as alternating current is depressured in pre-error input circuitry, rectification, filtering, incited somebody to action by power conversion circuit
The energy of DC power supply is converted to the signal power needed for load, and it is whole to be then loaded into progress in the second current rectifying and wave filtering circuit
Stream, filtering operation, and the various regulated power supplies needed for by output circuit output；The current-limiting protection circuit, to output circuit
Output current be detected, when detecting that the output current at output circuit is higher than design load, start current-limiting protection circuit
Work, and load on trigger signal a to pwm control circuit, so that the duty cycle of pwm control circuit diminishes, so that
Obtaining the output voltage of whole power supply reduces, and achievees the purpose that output overloading current limliting, avoids because the output of output circuit is powered not
Stablize（Electric current is excessive, magnitude of voltage is too high or too low etc.）Situation occur, avoid load from due to unstable power supply causing work
Make abnormal situation to occur；Specifically designing in use, utilizing sampled signal of the comparator circuit to the output circuit collected
Compared with reference voltage, then it is output in transistor circuit by indicator light circuit, then is acted on by transistor circuit
In photoelectric coupled circuit so that optocoupler works, so as to provide a triggering level for pwm control circuit so that pwm control circuit into
Row duty cycle adjusts（Duty cycle diminishes）.
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 set-up modes：Resistance R4, resistance R5, resistance R6, capacitance are provided with the comparator circuit
C1, capacitance C2, capacitance C3, diode D2 and amplifier chip UI2, the current-limiting protection monitoring point of output circuit are connected by resistance R7
On the in-phase input end of amplifier chip UI2, capacitance C3 and diode D2 are parallel with one another, and diode D2 and capacitance after parallel connection
C3 is connected between output circuit current-limiting protection monitoring point and ground, and the inverting input of amplifier chip UI2 is by being serially connected
Resistance R5 and resistance R6 is grounded, and resistance R6 connects reference voltage Vref with the connects end altogether of resistance R5；Amplifier chip UI2's is anti-phase
Input terminal connects the output terminal of amplifier chip UI2 by the capacitance C1 that is serially connected with resistance R4, and capacitance C2 is connected in parallel on amplifier core
Between the inverting input and output terminal of piece UI2, amplifier chip UI2 connects transistor circuit by indicator light circuit.
The plus earth of preferable diode D2, one end of capacitance C1 is connected with the output terminal of amplifier chip UI2.
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 set-up modes：The diode D1 being serially connected is provided with the indicator light circuit
With resistance R2, and the output signal of amplifier chip UI2 entered by the cathode of diode D1 after be transported in transistor circuit；Institute
Stating transistor circuit includes resistance R3 and transistor Q1, and photoelectric coupled circuit includes opto-coupler chip UI1 and resistance R1, opto-coupler chip UI1
The cathode of interior photodiode is connected by the collector of phototriode in resistance R1 connections power supply VCC, opto-coupler chip UI1
Pwm control circuit, the emitter ground connection of phototriode in opto-coupler chip UI1, the anode of photodiode in opto-coupler chip UI1
The collector of transistor Q1 is connected, the base stage of transistor Q1 is grounded by resistance R3, and the base stage of transistor Q1 and indicator light electricity
Road（Resistance R2）It is connected, the emitter ground connection of transistor Q1.
Preferable diode D1 uses light emitting diode, and the output terminal of the cathode connection amplifier chip UI2 of diode D1.
When in use, when the output circuit at output circuit current-limiting protection monitoring point is excessive, it is arranged at monitoring point
The voltage at the both ends of manganese-copper filament will rise, and the voltage is loaded into through resistance R7 on the in-phase input end of amplifier chip UI2 at this time, is made
The in-phase input end power supply for obtaining amplifier chip UI2 rises, and at this time transports the voltage high pressure for causing amplifier chip UI2 in-phase input ends
Put the voltage of chip UI2 inverting inputs, output HIGH voltage is caused transistor Q1 to turn on, opto-coupler chip by amplifier chip UI2
Photoelectric effect occurs for UI1, and a triggering level will be provided to pwm control circuit so that pwm control circuit carries out duty cycle and diminishes
Adjustment so that achieve the purpose that overload current limliting.
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 set-up modes：The transformer of interconnection is provided with the pre-error input circuitry
Circuit, the first current rectifying and wave filtering circuit, temperature sensor, overheating protection circuit and fan circuit, transformer circuit connection the
One current rectifying and wave filtering circuit, the first current rectifying and wave filtering circuit connection power conversion circuit, the temperature sensor are arranged on transformer electricity
It is connected on road and with overheating protection circuit, overheating protection circuit connection fan circuit, the independent air feed of fan circuit is to transformer
Circuit, temperature sensor detect the state of temperature of transformer in transformer circuit.
First current rectifying and wave filtering circuit, when alternating current will be filtered after transformer circuit decompression processing by the first rectification
The rectification of ripple device and filtering process, then obtain direct current output and are changed the energy of DC power supply by power conversion circuit
For the signal power needed for loading, then rectifying and wave-filtering processing will be carried out by the second current rectifying and wave filtering circuit.
When in use, temperature sensor monitors the temperature change value of transformer in real time, and gathered data is transmitted to overheat
Protect in circuit, when there is detected value more than the temperature value set, driving fan circuit is started to work, fan circuit is independent
Air feed is to transformer circuit so that transformer temperature declines, and temperature sensor continues to monitor, and model is automatically turned off when temperature drops to
After enclosing, overheating protection circuit will block the power supply of fan circuit so that fan circuit is stopped, so as to reach the confession of automation
Wind, and energy saving purpose can be played.
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 set-up modes：Input over under-voltage protection circuit and circuit of power factor correction are further included,
First current rectifying and wave filtering circuit connects input over under-voltage protection circuit and circuit of power factor correction respectively, and input overvoltage/undervoltage is protected
Protection circuit connects circuit of power factor correction, and circuit of power factor correction and input over under-voltage protection circuit are all electric with power conversion
Road is connected.
The input over under-voltage protection circuit, is used from the first current rectifying and wave filtering circuit, over-pressed or under-voltage when occurring
During situation, by outputs level signals to pwm control circuit, pwm control circuit will be off after receiving signal, and power supply will be without defeated
Go out.
The circuit of power factor correction, for improving the transfer efficiency of whole power supply.
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 set-up modes：It is also associated with sampling between the output circuit and pwm control circuit
Comparison system, the sampling comparison system include sample circuit and regulator circuit, and the output circuit connects sample circuit, sampling
Circuit regulator circuit, regulator circuit connection connection pwm control circuit.
The sample circuit will be sampled the output of output circuit, then feed back to PWM controls using regulator circuit
In circuit, pwm control circuit will make corresponding duty cycle adjustment according to the feedback voltage, and it is steady to be finally reached output circuit output
Fixed DC voltage.
Embodiment 7：
The present embodiment is 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 set-up modes：Short-circuit protection circuit is further included, the sample circuit connects short-circuit protection
Circuit, short-circuit protection circuit connection pwm control circuit；When there are short-circuit conditions, short-circuit protection circuit will send a gasket
To pwm control circuit, pwm control circuit shut-off so that whole power supply plays the purpose of short-circuit protection without output.
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 set-up modes：Output overvoltage protection circuit is further included, and output circuit connection exported
Voltage protection circuit, output overvoltage protection circuit connection pwm control circuit；When output voltage occur and exceeding setting value, exported
Voltage protection circuit works, and on output level to pwm control circuit so that the duty cycle of pwm control circuit is adjusted accordingly
It is whole, thus when output circuit output drop in setting value.
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 set-up modes：The PWM main control chips of the pwm control circuit use UC3842.
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 (9)
- A kind of 1. strong switching power supply of job stability, it is characterised in that：It is provided with pre-error input circuitry, power conversion electricity Road, the second current rectifying and wave filtering circuit, output circuit, postposition output circuit, current-limiting protection circuit and pwm control circuit, it is described preposition Input circuit connects power conversion circuit, and power conversion circuit connects the second current rectifying and wave filtering circuit, and the second current rectifying and wave filtering circuit connects Connect output circuit, output circuit connection current-limiting protection circuit, current-limiting protection circuit connection pwm control circuit；The current-limiting protection Circuit includes photoelectric coupled circuit, transistor circuit, indicator light circuit and comparator circuit, the output circuit connection comparator electricity Road, comparator circuit connect transistor circuit by indicator light circuit, and transistor circuit is connected with pwm control circuit.
- A kind of 2. strong switching power supply of job stability according to claim 1, it is characterised in that：The comparator Resistance R4, resistance R5, resistance R6, capacitance C1, capacitance C2, capacitance C3, diode D2 and amplifier chip UI2 are provided with circuit, The current-limiting protection monitoring point of output circuit is connected to by resistance R7 on the in-phase input end of amplifier chip UI2, capacitance C3 and two Pole pipe D2 is parallel with one another, and diode D2 after parallel connection and capacitance C3 are connected to output circuit current-limiting protection monitoring point and ground Between, the inverting input of amplifier chip UI2 is grounded by the resistance R5 and resistance R6 being serially connected, and resistance R6 and resistance R5 Connects end altogether connection reference voltage Vref；The inverting input of amplifier chip UI2 is connected by the capacitance C1 and resistance R4 being serially connected The output terminal of amplifier chip UI2 is connect, capacitance C2 is connected in parallel between the inverting input and output terminal of amplifier chip UI2, amplifier core Piece UI2 connects transistor circuit by indicator light circuit.
- A kind of 3. strong switching power supply of job stability according to claim 2, it is characterised in that：In the instruction The diode D1 and resistance R2 being serially connected are provided with circuit for lamp, and the output signal of amplifier chip UI2 passes through diode D1 Cathode enter after be transported in transistor circuit；The transistor circuit includes resistance R3 and transistor Q1, photoelectric coupled circuit bag Include opto-coupler chip UI1 and resistance R1, the cathode of photodiode passes through resistance R1 connection power supply VCC, optocoupler in opto-coupler chip UI1 The collector connection pwm control circuit of phototriode in chip UI1, the emitter of phototriode connects in opto-coupler chip UI1 Ground, the collector of the anode connection transistor Q1 of photodiode, the base stage of transistor Q1 pass through resistance R3 in opto-coupler chip UI1 Ground connection, and the base stage of transistor Q1 is connected with indicator light circuit, the emitter ground connection of transistor Q1.
- A kind of 4. strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：Described The transformer circuit of interconnection, the first current rectifying and wave filtering circuit, temperature sensor, overtemperature protection are provided with pre-error input circuitry Circuit and fan circuit, the transformer circuit connect the first current rectifying and wave filtering circuit, and the first current rectifying and wave filtering circuit connection power becomes Circuit is changed, the temperature sensor is arranged on transformer circuit and is connected with overheating protection circuit, and overheating protection circuit connects Wind-receiving fan circuit, the independent air feed of fan circuit detect the temperature of transformer in transformer circuit to transformer circuit, temperature sensor Degree state.
- A kind of 5. strong switching power supply of job stability according to claim 4, it is characterised in that：Further include input Over under-voltage protection circuit and circuit of power factor correction, first current rectifying and wave filtering circuit connect input overvoltage/undervoltage protection electricity respectively Road and circuit of power factor correction, input over under-voltage protection circuit connection circuit of power factor correction, circuit of power factor correction All it is connected with input over under-voltage protection circuit with power conversion circuit.
- A kind of 6. strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：Described Be also associated between output circuit and pwm control circuit sampling comparison system, it is described sampling comparison system include sample circuit and Regulator circuit, the output circuit connect sample circuit, sample circuit regulator circuit, regulator circuit connection connection PWM control electricity Road.
- A kind of 7. strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：Further include Short-circuit protection circuit, the sample circuit connect short-circuit protection circuit, short-circuit protection circuit connection pwm control circuit.
- A kind of 8. strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：Further include Output overvoltage protection circuit, and output circuit connection output overvoltage protection circuit, output overvoltage protection circuit connection PWM control electricity Road.
- A kind of 9. strong switching power supply of job stability according to Claims 2 or 3, it is characterised in that：The PWM The PWM main control chips of control circuit use UC3842.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310951.9A CN107911037A (en) | 2017-12-11 | 2017-12-11 | A kind of strong switching power supply of job stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310951.9A CN107911037A (en) | 2017-12-11 | 2017-12-11 | A kind of strong switching power supply of job stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107911037A true CN107911037A (en) | 2018-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711310951.9A Withdrawn CN107911037A (en) | 2017-12-11 | 2017-12-11 | A kind of strong switching power supply of job stability |
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| Country | Link |
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| CN (1) | CN107911037A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847832A (en) * | 2018-07-13 | 2018-11-20 | 温州德力汽摩部件有限公司 | The output comparison circuit of electric pressure converter |
| CN113436586A (en) * | 2021-08-04 | 2021-09-24 | 上海商米科技集团股份有限公司 | PWM voltage control circuit and method |
| CN114039479A (en) * | 2021-11-12 | 2022-02-11 | 天津航空机电有限公司 | 270V direct current ground power supply voltage ripple protection circuit |
| CN114257225A (en) * | 2020-09-23 | 2022-03-29 | 圣邦微电子（北京）股份有限公司 | Protection circuit and load switch circuit of power switch tube |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860185A (en) * | 2010-06-25 | 2010-10-13 | 深圳市四方电气技术有限公司 | Frequency converter drive protecting circuit |
| CN202309053U (en) * | 2011-09-06 | 2012-07-04 | 北京迪赛奇正科技有限公司 | Over-current protection circuit of voltage-type PWM circuit |
| CN202331243U (en) * | 2011-10-08 | 2012-07-11 | 滕敏亮 | Novel full-automatic contactless alternating current stabilized-voltage power supply |
| CN102709882A (en) * | 2012-05-05 | 2012-10-03 | 安徽力高新能源技术有限公司 | Short circuit protection circuit of direct current power supply provided with precharging function |
| 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 |
| CN203942687U (en) * | 2014-07-03 | 2014-11-12 | 苏州鸿益丰光电有限公司 | A kind of isolated form constant-current dimming circuit |
| CN204538973U (en) * | 2015-01-23 | 2015-08-05 | 山东艾诺仪器有限公司 | A kind of reverse exciting switching voltage regulator with protective circuit |
| CN104917152A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Open-phase protection circuit in three-phase high-power switching power supply |
| CN205319797U (en) * | 2015-12-02 | 2016-06-15 | 新余学院 | Industrial automation produces monitored control system |
| CN106535390A (en) * | 2016-10-09 | 2017-03-22 | 深圳创维－Rgb电子有限公司 | Constant current driving power supply and display equipment |
| CN207603469U (en) * | 2017-12-11 | 2018-07-10 | 陕西意联电气设备有限公司 | A kind of strong switching power supply of job stability |
-
2017
- 2017-12-11 CN CN201711310951.9A patent/CN107911037A/en not_active Withdrawn
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860185A (en) * | 2010-06-25 | 2010-10-13 | 深圳市四方电气技术有限公司 | Frequency converter drive protecting circuit |
| CN202309053U (en) * | 2011-09-06 | 2012-07-04 | 北京迪赛奇正科技有限公司 | Over-current protection circuit of voltage-type PWM circuit |
| CN202331243U (en) * | 2011-10-08 | 2012-07-11 | 滕敏亮 | Novel full-automatic contactless alternating current stabilized-voltage power supply |
| 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 |
| CN102709882A (en) * | 2012-05-05 | 2012-10-03 | 安徽力高新能源技术有限公司 | Short circuit protection circuit of direct current power supply provided with precharging function |
| CN203942687U (en) * | 2014-07-03 | 2014-11-12 | 苏州鸿益丰光电有限公司 | A kind of isolated form constant-current dimming circuit |
| CN204538973U (en) * | 2015-01-23 | 2015-08-05 | 山东艾诺仪器有限公司 | A kind of reverse exciting switching voltage regulator with protective circuit |
| CN104917152A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Open-phase protection circuit in three-phase high-power switching power supply |
| CN205319797U (en) * | 2015-12-02 | 2016-06-15 | 新余学院 | Industrial automation produces monitored control system |
| CN106535390A (en) * | 2016-10-09 | 2017-03-22 | 深圳创维－Rgb电子有限公司 | Constant current driving power supply and display equipment |
| CN207603469U (en) * | 2017-12-11 | 2018-07-10 | 陕西意联电气设备有限公司 | A kind of strong switching power supply of job stability |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847832A (en) * | 2018-07-13 | 2018-11-20 | 温州德力汽摩部件有限公司 | The output comparison circuit of electric pressure converter |
| CN114257225A (en) * | 2020-09-23 | 2022-03-29 | 圣邦微电子（北京）股份有限公司 | Protection circuit and load switch circuit of power switch tube |
| CN113436586A (en) * | 2021-08-04 | 2021-09-24 | 上海商米科技集团股份有限公司 | PWM voltage control circuit and method |
| CN113436586B (en) * | 2021-08-04 | 2023-04-25 | 上海商米科技集团股份有限公司 | PWM voltage control circuit and method |
| CN114039479A (en) * | 2021-11-12 | 2022-02-11 | 天津航空机电有限公司 | 270V direct current ground power supply voltage ripple protection circuit |
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