CN107846139A - A kind of Switching Power Supply of the preposition current-limiting protection function of band - Google Patents
A kind of Switching Power Supply of the preposition current-limiting protection function of band Download PDFInfo
- Publication number
- CN107846139A CN107846139A CN201711308350.4A CN201711308350A CN107846139A CN 107846139 A CN107846139 A CN 107846139A CN 201711308350 A CN201711308350 A CN 201711308350A CN 107846139 A CN107846139 A CN 107846139A
- Authority
- CN
- China
- Prior art keywords
- circuit
- current
- limiting protection
- output
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
Abstract
The invention discloses a kind of Switching Power Supply of the preposition current-limiting protection function of band, in input, current-limiting protection circuit is set, when the output current for detecting the first current rectifying and wave filtering circuit is too high, current-limiting protection circuit work can be started, trigger signal is loaded to pwm control circuit, power conversion circuit is adjusted pwm control circuit, so that the output voltage of rearmounted output circuit reduces, it is provided with pre-error input circuitry, power conversion circuit, rearmounted output circuit, current-limiting protection circuit and pwm control circuit, the pre-error input circuitry connects power conversion circuit, power conversion circuit connects rearmounted output circuit, pre-error input circuitry connects current-limiting protection circuit, current-limiting protection circuit connects pwm control circuit；The anti-lightning system being sequentially connected, electromagnetic interference filter circuit and the first current rectifying and wave filtering circuit are provided with pre-error input circuitry, the first current rectifying and wave filtering circuit connects power conversion circuit and current-limiting protection circuit respectively.
Description
Technical field
The present invention relates to the fields such as power technology, PWM technologies, are a kind of preposition current-limiting protection functions of band specifically
Switching Power Supply.
Background technology
Power supply is the device that power is provided to electronic equipment, also referred to as power supply unit, and it provides all parts in computer
Required electric energy.Whether the size of power, electric current and voltage are stablized, and by the service behaviour for directly affecting computer and make
Use the life-span.
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 typically 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 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, it 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 realize switching power supply output
Change.This mode can make the output voltage of power supply keep constant in operation conditions change, be the numeral using microprocessor
A kind of very effective technology that signal is controlled to analog circuit.
The advantages of PWM control technologies are simple with its control, and flexibly and dynamic response is good and to turn into Power Electronic Technique most wide
The control mode of general application, and the focus of people's research.Because 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 turn into 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 realize the change of switching power supply output.This mode can make the output electricity of power supply
Keep constant when being pressed in operation conditions change, be analog circuit is controlled using the data 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 equal spike train of each pulse width as PWM waveform, arteries and veins can be changed with frequency modulation by the cycle for changing spike train
The width or dutycycle of punching can be such that voltage changes with frequency coordination with pressure regulation using suitable control method.Tune can be passed through
Whole PWM cycle, PWM dutycycle and reach control charging current purpose.
Pulsewidth modulation（PWM）General principle：Control mode is exactly that the break-make of inverter circuit switching device is controlled, and is made
Output end 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, it can also change output frequency.
The content of the invention
It is an object of the invention to provide a kind of Switching Power Supply of the preposition current-limiting protection function of band, and current limliting is set in input
Protection circuit, when the output current for detecting the first current rectifying and wave filtering circuit is too high, current-limiting protection circuit work can be started, and
Load on trigger signal a to pwm control circuit, so that power conversion circuit is adjusted pwm control circuit, make
Obtaining the output voltage of rearmounted output circuit reduces, so as to avoid because the output of pre-error input circuitry increases and influences rear end suddenly
The unstable situation of output voltage occurs, and avoids load from causing the situation of operation irregularity to occur due to unstable power supply.
The present invention is achieved through the following technical solutions：A kind of Switching Power Supply of the preposition current-limiting protection function of band, before being provided with
Put input circuit, power conversion circuit, rearmounted output circuit, current-limiting protection circuit and pwm control circuit, the preposition input electricity
Road connects power conversion circuit, and power conversion circuit connects rearmounted output circuit, and pre-error input circuitry connects current-limiting protection circuit,
Current-limiting protection circuit connects pwm control circuit；The anti-lightning system being sequentially connected is provided with pre-error input circuitry, electromagnetism is done
Filter circuit and the first current rectifying and wave filtering circuit are disturbed, the first current rectifying and wave filtering circuit connects power conversion circuit and current-limiting protection electricity respectively
Road.
Further is that the present invention is better achieved, especially using following setting structures：In first rectifying and wave-filtering electricity
It is also associated with inputting over under-voltage protection circuit on road, and inputs over under-voltage protection circuit connection pwm control circuit.
Further is that the present invention is better achieved, especially using following setting structures：Also include PFC electricity
Road, first current rectifying and wave filtering circuit connect circuit of power factor correction, input over under-voltage protection circuit connection power factor school
Positive circuit, circuit of power factor correction connection power conversion circuit.
Further is that the present invention is better achieved, especially using following setting structures：Put in the rear in output circuit
The second current rectifying and wave filtering circuit, sample circuit, mu balanced circuit and output circuit are provided with, the power conversion circuit connection second is whole
Flow filter circuit, the second current rectifying and wave filtering circuit connection output circuit, output circuit connection sample circuit, sample circuit connection voltage stabilizing
Circuit, mu balanced circuit connection pwm control circuit.
Further is that the present invention is better achieved, especially using following setting structures：Also include short-circuit protection circuit, 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 setting structures：Also 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 setting structures：The master control of the pwm control circuit
Chip uses SG3525.
The present invention compared with prior art, has advantages below and beneficial effect：
The present invention sets current-limiting protection circuit in input, when the output current for detecting the first current rectifying and wave filtering circuit is too high,
Current-limiting protection circuit work can be started, and loaded on trigger signal a to pwm control circuit, so that PWM control electricity
Power conversion circuit is adjusted on road so that the output voltage of rearmounted output circuit reduces, so as to avoid because preposition input
The output of circuit increases and influences the unstable situation of rear end output voltage and occur suddenly, avoids load due to unstable power supply
And the situation of operation irregularity is caused to occur.
The present invention is designed using various kinds of protective circuit, can be when short circuit occur, crossing tooth or under-voltage condition, all can be steady
Fixed operation, there is the features such as working stability, safe to use.
Brief description of the drawings
Fig. 1 is principle of the invention block diagram.
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：
A kind of Switching Power Supply of the preposition current-limiting protection function of band, current-limiting protection circuit is set in input, when detecting that first is whole
When the output current of stream filter circuit is too high, current-limiting protection circuit work can be started, and load a trigger signal to PWM controls
On circuit processed, so that power conversion circuit is adjusted pwm control circuit so that the output voltage of rearmounted output circuit
Reduce, so as to avoid influenceing the unstable situation hair of rear end output voltage because the output of pre-error input circuitry increases suddenly
It is raw, avoid load from causing the situation of operation irregularity to occur due to unstable power supply, as shown in figure 1, especially being set using following
Put structure：It is provided with pre-error input circuitry, power conversion circuit, rearmounted output circuit, current-limiting protection circuit and PWM control electricity
Road, the pre-error input circuitry connect power conversion circuit, and power conversion circuit connects rearmounted output circuit, pre-error input circuitry
Connect current-limiting protection circuit, current-limiting protection circuit connection pwm control circuit；It is provided with what is be sequentially connected in pre-error input circuitry
Anti-lightning system, electromagnetic interference filter circuit and the first current rectifying and wave filtering circuit, the first current rectifying and wave filtering circuit connect power change respectively
Change circuit and current-limiting protection circuit.
The anti-lightning system, when alternating current is accessed by anti-lightning system, in thunderstorm weather, thunderbolt can be produced
Raw high intensity transient voltage imports ground end, avoids whole power supply from being damaged；The electromagnetic interference filter circuit, can avoid by
Occur in the unstable situation of out-put supply caused by electromagnetic interference；First current rectifying and wave filtering circuit, when alternating current passes through
It will then be obtained direct current output by the first rectifier filter rectification and filtering process and pass through after EMI FILTER processing
The energy conversion of DC power supply is the signal power needed for load by power conversion circuit；The current-limiting protection circuit, when
When detecting that the output current of the first current rectifying and wave filtering circuit is too high, current-limiting protection circuit work can be started, and load one and touch
Signal to pwm control circuit, so that power conversion circuit is adjusted pwm control circuit so that rearmounted output
The output voltage of circuit reduces, so as to avoid because the output of pre-error input circuitry increases and influences rear end output voltage not suddenly
Stable situation occurs, and avoids load from causing the situation of operation irregularity to occur due to unstable power supply.
Embodiment 2：
The present embodiment is further optimized on the basis of above-described embodiment, as shown in figure 1, further is that this is better achieved
Invention, especially using following setting structures：It is also associated with inputting over under-voltage protection circuit on first current rectifying and wave filtering circuit,
And input over under-voltage protection circuit connection pwm control circuit.
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.
Embodiment 3：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in figure 1, further to be preferably real
The existing present invention, especially using following setting structures：Also include circuit of power factor correction, the first current rectifying and wave filtering circuit connection
Circuit of power factor correction, input over under-voltage protection circuit connection circuit of power factor correction, circuit of power factor correction connection
Power conversion circuit.
The circuit of power factor correction, for improving the conversion efficiency of whole power supply.
Embodiment 4：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in figure 1, further to be preferably real
The existing present invention, especially using following setting structures：Put in the rear in output circuit and be provided with the second current rectifying and wave filtering circuit, sampling
Circuit, mu balanced circuit and output circuit, the power conversion circuit connect the second current rectifying and wave filtering circuit, the second current rectifying and wave filtering circuit
Connect output circuit, output circuit connection sample circuit, sample circuit connection mu balanced circuit, mu balanced circuit connection PWM control electricity
Road.
Rectifying and wave-filtering processing will be carried out using the second current rectifying and wave filtering circuit after power conversion circuit is handled, then same mistake
The voltage-stabilized power supply of various magnitudes of voltage needed for output circuit output, while sample circuit will be sampled, and then utilize voltage stabilizing electricity
Road is fed back in pwm control circuit, and pwm control circuit will make corresponding dutycycle adjustment according to the feedback voltage, finally reach
Steady dc voltage is exported to output circuit.
Embodiment 5：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in figure 1, further to be preferably real
The existing present invention, especially using following setting structures：Also include short-circuit protection circuit, the sample circuit connection short-circuit protection electricity
Road, short-circuit protection circuit connection pwm control circuit；When there are short-circuit conditions, short-circuit protection circuit will send a pad extremely
On pwm control circuit, pwm control circuit shut-off so that whole power supply plays the purpose of short-circuit protection without output.
Embodiment 6：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in figure 1, further to be preferably real
The existing present invention, especially using following setting structures：Also include output overvoltage protection circuit, and output circuit connection output overvoltage is protected
Protection circuit, output overvoltage protection circuit connection pwm control circuit；When output voltage occur and exceeding setting value, output overvoltage is protected
Protection circuit works, and on output level to pwm control circuit so that the dutycycle of pwm control circuit is adjusted accordingly, from
And when output circuit output drop in setting value.
Embodiment 7：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in figure 1, further to be preferably real
The existing present invention, especially using following setting structures：The main control chip of the pwm control circuit uses SG3525.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done 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 (7)
- A kind of 1. Switching Power Supply of the preposition current-limiting protection function of band, it is characterised in that：It is provided with pre-error input circuitry, power conversion Circuit, rearmounted output circuit, current-limiting protection circuit and pwm control circuit, the pre-error input circuitry connect power conversion circuit, Power conversion circuit connects rearmounted output circuit, pre-error input circuitry connection current-limiting protection circuit, current-limiting protection circuit connection PWM Control circuit；It is whole that the anti-lightning system being sequentially connected, electromagnetic interference filter circuit and first are provided with pre-error input circuitry Filter circuit is flowed, the first current rectifying and wave filtering circuit connects power conversion circuit and current-limiting protection circuit respectively.
- A kind of 2. Switching Power Supply of the preposition current-limiting protection function of band according to claim 1, it is characterised in that：Described It is also associated with inputting over under-voltage protection circuit on one current rectifying and wave filtering circuit, and inputs over under-voltage protection circuit connection PWM control electricity Road.
- A kind of 3. Switching Power Supply of the preposition current-limiting protection function of band according to claim 2, it is characterised in that：Also include work( Rate factor correcting circuit, first current rectifying and wave filtering circuit connect circuit of power factor correction, and input over under-voltage protection circuit connects Connect circuit of power factor correction, circuit of power factor correction connection power conversion circuit.
- A kind of 4. Switching Power Supply of the preposition current-limiting protection function of band according to claim 1-3, it is characterised in that：Described The second current rectifying and wave filtering circuit, sample circuit, mu balanced circuit and output circuit, the power conversion are provided with rearmounted output circuit Circuit connects the second current rectifying and wave filtering circuit, the second current rectifying and wave filtering circuit connection output circuit, output circuit connection sample circuit, takes Sample circuit connects mu balanced circuit, mu balanced circuit connection pwm control circuit.
- A kind of 5. Switching Power Supply of the preposition current-limiting protection function of band according to claim 4, it is characterised in that：Also include short Road protection circuit, the sample circuit connect short-circuit protection circuit, short-circuit protection circuit connection pwm control circuit.
- A kind of 6. Switching Power Supply of the preposition current-limiting protection function of band according to claim 4, it is characterised in that：Also include defeated Go out overvoltage crowbar, and output circuit connection output overvoltage protection circuit, output overvoltage protection circuit connection PWM control electricity Road.
- A kind of 7. Switching Power Supply of the preposition current-limiting protection function of band according to claim 5, it is characterised in that：The PWM The main control chip of control circuit uses SG3525.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711308350.4A CN107846139A (en) | 2017-12-11 | 2017-12-11 | A kind of Switching Power Supply of the preposition current-limiting protection function of band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711308350.4A CN107846139A (en) | 2017-12-11 | 2017-12-11 | A kind of Switching Power Supply of the preposition current-limiting protection function of band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107846139A true CN107846139A (en) | 2018-03-27 |
Family
ID=61664223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711308350.4A Withdrawn CN107846139A (en) | 2017-12-11 | 2017-12-11 | A kind of Switching Power Supply of the preposition current-limiting protection function of band |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107846139A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166482A (en) * | 2011-12-17 | 2013-06-19 | 西安恒飞电子科技有限公司 | Communication power source with multiple protection functions |
| CN204131410U (en) * | 2014-09-23 | 2015-01-28 | 甘肃电保姆电力工程服务有限公司 | A kind of novel high-frequency and high-voltage power supply |
| CN205792229U (en) * | 2016-05-21 | 2016-12-07 | 武汉杭久电气有限公司 | Large-power occasions high-power factor DC power supply in one |
-
2017
- 2017-12-11 CN CN201711308350.4A patent/CN107846139A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166482A (en) * | 2011-12-17 | 2013-06-19 | 西安恒飞电子科技有限公司 | Communication power source with multiple protection functions |
| CN204131410U (en) * | 2014-09-23 | 2015-01-28 | 甘肃电保姆电力工程服务有限公司 | A kind of novel high-frequency and high-voltage power supply |
| CN205792229U (en) * | 2016-05-21 | 2016-12-07 | 武汉杭久电气有限公司 | Large-power occasions high-power factor DC power supply in one |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180327 |
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| WW01 | Invention patent application withdrawn after publication |