CN106877700A - A kind of novel switched voltage-stabilized power supply based on UC3842 - Google Patents
A kind of novel switched voltage-stabilized power supply based on UC3842 Download PDFInfo
- Publication number
- CN106877700A CN106877700A CN201510927277.3A CN201510927277A CN106877700A CN 106877700 A CN106877700 A CN 106877700A CN 201510927277 A CN201510927277 A CN 201510927277A CN 106877700 A CN106877700 A CN 106877700A
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- China
- Prior art keywords
- circuit
- power supply
- voltage
- stabilized power
- supply based
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
-
- 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
- H02M3/33523—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 with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of novel switched voltage-stabilized power supply based on UC3842 is made up of low-pass filter circuit, current rectifying and wave filtering circuit, pulsewidth modulation, feedback circuit and protection circuit.A kind of high frequency single-ended reverse exciting switching power supply with loop Current-type PWM Controller UC3842 chips as core.Divided based on signal flow and circuit function module; coordinate new device UC3842 to realize using three terminal regulator TL431 to export the control and voltage stabilizing of supply voltage; the Electro Magnetic Compatibility of power supply and security requirement; design has controlled Conduction Interference using LPF; isolation and the feedback of input/output are realized using optocoupler PC817, and adds the safeguard measures such as thermistor, piezo-resistance and overvoltage, overcurrent protection in a power.Have the advantages that voltage regulation performance is excellent, ripple is small, voltage regulation factor, load regulation it is high.
Description
Technical field
The present invention relates to a kind of novel switched voltage-stabilized power supply based on UC3842.
Background technology
Switching Power Supply design is core generally from PWM integrated chips.In recent years, PWM is controlled into the Switching Power Supply integrated manipulator that circuit, protection circuit be integrated on chip piece, its peripheral circuit is simple, reliability is high.
Common PWM controllers are divided into 2 kinds of voltage-controlled type and current-control type.Voltage type PWM controller is come adjusting pulsewidth by feedback voltage.Current type PWM controller is relatively to adjust dutycycle compared with error amplifier output signal by the current signal of outputting inductance coil, so that inductance peak point current changes with error change.Compared with voltage type PWM, the stability and dynamic characteristic that current type PWM has more preferable voltage regulation factor and load regulation, system are also obviously improved, particularly in it current limiting capacity and parallel current-sharing ability control circuit is become simple and reliable.Current type PWM
Integrated manipulator commercialization, its small-power power has been substituted voltage type PWM control small-power power.
The content of the invention
To solve the above problems, the present invention devises a kind of novel switched voltage-stabilized power supply based on UC3842.
The technical solution adopted for the present invention to solve the technical problems is：One kind is based on
The novel switched voltage-stabilized power supply of UC3842 is made up of low-pass filter circuit, current rectifying and wave filtering circuit, pulsewidth modulation, feedback circuit and protection circuit.
The low-pass filter circuit, controls common mode and the difference mode signal interference of the Conduction Interference and power network ecto-entad by Switching Power Supply from inside to outside.
The current rectifying and wave filtering circuit, high-frequency noise can also be reduced in importation with rectification and filtering.The filter inductance of output end can also filter High-frequency Interference.
The pulsewidth modulation, pulsewidth modulation produces circuit to be realized by UC3842 and peripheral circuit.Duty cycle of switching is changed by sampling feedback circuit, comes the conducting of controlling switch pipe and the pulsewidth closed, so that output voltage stabilization.
The feedback circuit is mainly made up of three terminal regulator TL431 and optocoupler PC817, constitutes error voltage amplifier using TL431 adjustable precises voltage-stablizer, then accurately adjusted by the symplectic output of linear light.
The protection circuit is main by constituting overvoltage crowbar, and when feedback winding voltage is raised, conducting is also switched on afterwards, the conducting degree increased after conducting, so as to play overvoltage protection effect.
The beneficial effects of the invention are as follows a kind of high frequency single-ended reverse exciting switching power supply with loop Current-type PWM Controller UC3842 chips as core.Divided based on signal flow and circuit function module; coordinate new device UC3842 to realize using three terminal regulator TL431 to export the control and voltage stabilizing of supply voltage; the Electro Magnetic Compatibility of power supply and security requirement; design has controlled Conduction Interference using LPF; isolation and the feedback of input/output are realized using optocoupler PC817, and adds the safeguard measures such as thermistor, piezo-resistance and overvoltage, overcurrent protection in a power.Have the advantages that voltage regulation performance is excellent, ripple is small, voltage regulation factor, load regulation it is high.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is the basic theory of constitution block diagram of switching power supply.
Fig. 2 is novel switched voltage-stabilized power supply design principle figure.
Specific embodiment
In Fig. 1, power circuit is mainly made up of several parts such as low-pass filter circuit, rectifying and wave-filtering, pulsewidth modulation, feedback, protection location circuits.
In fig. 2, it is the systematic schematic diagram of the high frequency single-end flyback switching power supply circuit of core design to use UC3842.Circuit input is 220 V alternating currents, after rectified bridge rectifying and wave-filtering, the DC voltage of about 300 V is reached in transformer inputs.Through UC3842 chips
After PWM pulse-width controlled voltage stabilizings, the output stablized.Must take measures, control the interference produced from power circuit, possess good antijamming capability again.So, the input in importation is powered up and held, inductance and, collectively constitute low-pass filter circuit, control common mode and difference mode signal by Switching Power Supply Conduction Interference from inside to outside and power network ecto-entad and disturb.In importation, rectifier bridge and electric capacity can also reduce high-frequency noise with rectification and filtering.The filter inductance of output end can also filter High-frequency Interference.In addition, in order to reduce common-mode noise, in output and input ground between adjunction electric capacity.Feedback circuit is mainly made up of three terminal regulator TL431 and optocoupler PC817, utilizes
TL431 adjustable precises voltage-stablizer constitutes error voltage amplifier, then is accurately adjusted by the symplectic output of linear light.Output voltage is compared when positive error occurs in output voltage, and sampling voltage is more than 2.5 V, TL431 by the sampling voltage obtained after partial pressure with 2.5 V reference voltages in TL431
The reduction of voltage stabilizing value, optocoupler PC817 control ends electric current increase, the feedback terminal voltage value increase of UC3842, the pulse signal dutycycle reduction of output end, the ON time of switching tube reduces, output voltage reduction., whereas if negative error occurs in output voltage, the output pulse duty factor increase of UC3842, output voltage increases, and reaches voltage stabilizing purpose.Meanwhile, the input of whole power-supply system, output are isolated, and the interference that UC3842 is subject to is reduced.Protection circuit is main by constituting overvoltage crowbar, and when feedback winding voltage is raised, conducting is also switched on afterwards, the conducting degree increased after conducting, so as to play overvoltage protection effect.In addition, fuse there will be pressure-resistant, impact resistance characteristic, once being short-circuited in machine, fuse, cut power supply, but this is intended only as the complementary salvo of one of which.Also strengthen the reliability of circuit and protectiveness in input plus thermistor and piezo-resistance.
Claims (6)
1. a kind of novel switched voltage-stabilized power supply based on UC3842 is made up of low-pass filter circuit, current rectifying and wave filtering circuit, pulsewidth modulation, feedback circuit and protection circuit.
2. a kind of novel switched voltage-stabilized power supply based on UC3842 according to claim 1, it is characterized in that the low-pass filter circuit is controlled being disturbed by the common mode and difference mode signal of Switching Power Supply Conduction Interference from inside to outside and power network ecto-entad.
3. a kind of novel switched voltage-stabilized power supply based on UC3842 according to claim 1, it is characterized in that the current rectifying and wave filtering circuit can also reduce high-frequency noise in importation with rectification and filtering；The filter inductance of output end can also filter High-frequency Interference.
4. a kind of novel switched voltage-stabilized power supply based on UC3842 according to claim 1, it is characterized in that the pulsewidth modulation produces circuit to be realized by UC3842 and peripheral circuit.
5. a kind of novel switched voltage-stabilized power supply based on UC3842 according to claim 1, it is characterized in that the feedback circuit is mainly made up of three terminal regulator TL431 and optocoupler PC817, error voltage amplifier is constituted using TL431 adjustable precises voltage-stablizer, then is accurately adjusted by the symplectic output of linear light.
6. a kind of novel switched voltage-stabilized power supply based on UC3842 according to claim 1; it is characterized in that the protection circuit mainly includes overvoltage crowbar; when feedback winding voltage is raised; Vt2 is turned on; Vt3 is also switched on afterwards; the conducting degree of Vt1 is increased after Vt3 conductings, so as to play overvoltage protection effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510927277.3A CN106877700A (en) | 2015-12-14 | 2015-12-14 | A kind of novel switched voltage-stabilized power supply based on UC3842 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510927277.3A CN106877700A (en) | 2015-12-14 | 2015-12-14 | A kind of novel switched voltage-stabilized power supply based on UC3842 |
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| Publication Number | Publication Date |
|---|---|
| CN106877700A true CN106877700A (en) | 2017-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510927277.3A Pending CN106877700A (en) | 2015-12-14 | 2015-12-14 | A kind of novel switched voltage-stabilized power supply based on UC3842 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365765A (en) * | 2018-03-30 | 2018-08-03 | 上海理工大学 | A kind of multiple-channel output single-end flyback switching power supply |
| CN109560704A (en) * | 2017-09-26 | 2019-04-02 | 南京淳泰控制设备有限公司 | A kind of orientation attitude measurement instrument battery module |
-
2015
- 2015-12-14 CN CN201510927277.3A patent/CN106877700A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560704A (en) * | 2017-09-26 | 2019-04-02 | 南京淳泰控制设备有限公司 | A kind of orientation attitude measurement instrument battery module |
| CN108365765A (en) * | 2018-03-30 | 2018-08-03 | 上海理工大学 | A kind of multiple-channel output single-end flyback switching power supply |
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Application publication date: 20170620 |