CN205319949U - Novel simple and easy switching power supply - Google Patents
Novel simple and easy switching power supply Download PDFInfo
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- CN205319949U CN205319949U CN201521135338.4U CN201521135338U CN205319949U CN 205319949 U CN205319949 U CN 205319949U CN 201521135338 U CN201521135338 U CN 201521135338U CN 205319949 U CN205319949 U CN 205319949U
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Abstract
The utility model discloses a novel simple and easy switching power supply, including the electromagnetic compatibility wave filter, D1 is piled to the rectifier bridge, current control type pulsewidth modulation chip and transformer circuit, the electromagnetic compatibility wave filter is connected the rectifier bridge and is piled D1, the rectifier bridge is piled D1 and is looped through resistance R1, R2 is connected to the feeder ear of current control type pulsewidth modulation chip, resistance R2 is connected to the elementary N1's of transformer one end, the feeder ear of the pulsewidth modulation chip zener diode VD1 through the series -opposing connection is connected to the elementary N3's of transformer one end, connect the output Rectifier filter circuit who constitutes by rectifier diode VD4 and filter capacitance C10 series connection between the secondary N2 both ends of transformer. The utility model discloses become by current mode, the single -ended flyback output formula PDM keyer and the N channel MOS nest of tubes, its peripheral circuit is simple, excellent performance, and the stability reaches 0.2%, voltage regulation and reaches 0.2%, load regulation and reach 0.3%.
Description
Technical field
The utility model relates to switch power technology field, particularly relates to a kind of novel simple switch power supply.
Background technology
The integrated voltage-stabilized power supply chip produced both at home and abroad at present nearly up to ten thousand kinds, is roughly divided into linear power supply and switch power supply. Switch power supply product is widely used in industrial automatic control, military industry equipment, research equipment, LED illumination, industrial control equipment, communication equipment, power equipment, instrument, medical facilities, semi-conductor cooling and warming, air purifier, electronics refrigerator, liquid-crystal display, LED lamp, communication equipment, audio-visual products, safety monitoring, LED bag, computer housing, the field such as digital product and instrument class.
Switch power supply utilizes modern power electronics technology, the time ratio that trip switch pipe turns on and off, and maintains a kind of power supply stablizing output voltage, and switch power supply generally controls IC and MOSFET by pulse-width modulation (PWM) and forms. Along with development and the innovation of Power Electronic Technique so that switch power technology is also innovated constantly. At present, switch power supply is widely used nearly all electronics with small-sized, light weight and high efficiency feature, is a kind of power mode that current electronics and information industry develop rapidly is indispensable.
Modern switch power supply has two kinds: one is direct-current switch power supply; Another kind is alternating-current switch power supply. Wherein alternating-current switch power supply is used for the isolation of power frequency 220v voltage of alternating current is converted to 5v voltage, for the IC of all types of industries self-service instrument inside provides working power. But, peripheral circuit is complicated mostly, cost is higher, performance is general, stability is good not for the alternating-current switch power supply of prior art, and relative regulation and load regulation are bad.
Practical novel content
Because the above-mentioned defect of prior art, technical problem to be solved in the utility model is to provide a kind of novel simple switch power supply, it is made up of current mode, single-ended reverse exciting output type pulse width modulation controlled device and N-channel MOSFET, its peripheral circuit is simple, excellent property, stability reaches 0.2%, and relative regulation reaches 0.2%, and load regulation reaches 0.3%.
For achieving the above object, the utility model provides a kind of novel simple switch power supply, it is characterized in that: comprise the electromagnetic compatibility wave filter ZYH-EO-3A for filtering external interference signals, rectification bridge heap D1, current-control type pulse width modulating chip UC3842 and transformer circuit, described electromagnetic compatibility wave filter ZYH-EO-3A input terminus connects 220V and exchanges city's electricity, described electromagnetic compatibility wave filter ZYH-EO-3A output terminal connects rectification bridge heap D1, described rectification bridge heap D1 DC output end is successively by resistance R1, R2 is connected to the power supply end of current-control type pulse width modulating chip UC3842, described resistance R2 is connected to one end of primary N1, the power supply end of described current-control type pulse width modulating chip UC3842 is connected to one end of primary N3 by the Zener diode VD1 oppositely connected, the other end of described primary N1 connects by C8, VD3, R11, R12, C9, the inverse electromotive force two-stage of VD2 composition absorbs circuit, the other end ground connection of described primary N3, connect between described transformer secondary output N2 two ends and it is connected in series, by rectification diode VD4 and filter capacitor C10, the output rectifier and filter formed, rectification diode VD4 and filter capacitor C10 coupling end are DC output end.
Above-mentioned a kind of novel simple switch power supply, it is characterised in that: described inverse electromotive force two-stage absorbs circuit and is respectively the second stage absorption circuit that the first step that be made up of electric capacity C8, Zener diode VD3, resistance R11 absorbs circuit and resistance R12, electric capacity C9, Zener diode VD2 form; Wherein VD3, R11 are in parallel, and VD3 positive pole is connected with electric capacity C8 one end, VD3 negative pole ground connection, the other end of the electric capacity C8 elementary N1 of the other end connection transformer; Described resistance R12, electric capacity C9 are in parallel, the resistance R12 of parallel connection, one end of electric capacity C9 one end elementary N1 of connection transformer, and the resistance R12 of parallel connection, the electric capacity C9 the other end pass through the other end of the oppositely Zener diode elementary N1 of VD2 connection transformer of serial connection.
Above-mentioned a kind of novel simple switch power supply, it is characterized in that: the pwm signal output terminal of described current-control type pulse width modulating chip UC3842 is connected to the grid of MOS pipe Q1 by resistance R7, the other end of the elementary N1 of drain electrode connection transformer of described MOS pipe Q1, source electrode contact resistance R10 one end of described MOS pipe Q1, described resistance R10 the other end ground connection, the source electrode of described MOS pipe Q1 is also connected to the current detecting end of current-control type pulse width modulating chip UC3842 by resistance R9.
Above-mentioned a kind of novel simple switch power supply, it is characterised in that: the votage reference pin of described current-control type pulse width modulating chip UC3842 connects the charge-discharge circuit being composed in series by resistance R6, electric capacity C6.
Above-mentioned a kind of novel simple switch power supply, it is characterized in that: the feedback pin of described current-control type pulse width modulating chip UC3842 connects the dividing potential drop circuit being made up of resistance R3, R4, wherein the junction of resistance R3 one end and R4 one end connects feedback pin, resistance R3 the other end ground connection, the direct current supply pin of resistance R4 another termination current-control type pulse width modulating chip UC3842.
Above-mentioned a kind of novel simple switch power supply, it is characterised in that: the power supply end of described current-control type pulse width modulating chip UC3842 also connects filter capacitor C2 positive pole, filter capacitor C2 negative pole ground connection.
Above-mentioned a kind of novel simple switch power supply, it is characterised in that: described MOS pipe Q1 adopts IRF-PG407 type N-channel MOS to manage.
Above-mentioned a kind of novel simple switch power supply, it is characterised in that: the power supply end trigger voltage of described current-control type pulse width modulating chip UC3842 is 16V.
The beneficial effects of the utility model are:
The utility model is made up of current mode, single-ended reverse exciting output type pulse width modulation controlled device and N-channel MOSFET, and its peripheral circuit is simple, and excellent property, stability reaches 0.2%, and relative regulation reaches 0.2%, and load regulation reaches 0.3%.
Below with reference to accompanying drawing, the technique effect of design of the present utility model, concrete structure and generation is described further, fully to understand the purpose of this utility model, characteristic sum effect.
Accompanying drawing explanation
Fig. 1 is schematic circuit diagram of the present utility model.
Fig. 2 is Real output waveform figure of the present utility model.
Embodiment
As shown in Figure 1, a kind of novel simple switch power supply, it is characterized in that: comprise the electromagnetic compatibility wave filter ZYH-EO-3A for filtering external interference signals, rectification bridge heap D1, current-control type pulse width modulating chip UC3842 and transformer circuit, described electromagnetic compatibility wave filter ZYH-EO-3A input terminus connects 220V and exchanges city's electricity, described electromagnetic compatibility wave filter ZYH-EO-3A output terminal connects rectification bridge heap D1, described rectification bridge heap D1 DC output end is successively by resistance R1, R2 is connected to the power supply end of current-control type pulse width modulating chip UC3842, described resistance R2 is connected to one end of primary N1, the power supply end of described current-control type pulse width modulating chip UC3842 is connected to one end of primary N3 by the Zener diode VD1 oppositely connected, the other end of described primary N1 connects by C8, VD3, R11, R12, C9, the inverse electromotive force two-stage of VD2 composition absorbs circuit, the other end ground connection of described primary N3, connect between described transformer secondary output N2 two ends and it is connected in series, by rectification diode VD4 and filter capacitor C10, the output rectifier and filter formed, rectification diode VD4 and filter capacitor C10 coupling end are DC output end.
In the present embodiment, described inverse electromotive force two-stage absorbs circuit and is respectively the second stage absorption circuit that the first step that be made up of electric capacity C8, Zener diode VD3, resistance R11 absorbs circuit and resistance R12, electric capacity C9, Zener diode VD2 form; Wherein VD3, R11 are in parallel, and VD3 positive pole is connected with electric capacity C8 one end, VD3 negative pole ground connection, the other end of the electric capacity C8 elementary N1 of the other end connection transformer; Described resistance R12, electric capacity C9 are in parallel, the resistance R12 of parallel connection, one end of electric capacity C9 one end elementary N1 of connection transformer, and the resistance R12 of parallel connection, the electric capacity C9 the other end pass through the other end of the oppositely Zener diode elementary N1 of VD2 connection transformer of serial connection.
In the present embodiment, the pwm signal output terminal of described current-control type pulse width modulating chip UC3842 is connected to the grid of MOS pipe Q1 by resistance R7, the other end of the elementary N1 of drain electrode connection transformer of described MOS pipe Q1, source electrode contact resistance R10 one end of described MOS pipe Q1, described resistance R10 the other end ground connection, the source electrode of described MOS pipe Q1 is also connected to the current detecting end of current-control type pulse width modulating chip UC3842 by resistance R9.
In the present embodiment, the votage reference pin of described current-control type pulse width modulating chip UC3842 connects the charge-discharge circuit being composed in series by resistance R6, electric capacity C6.
In the present embodiment, the feedback pin of described current-control type pulse width modulating chip UC3842 connects the dividing potential drop circuit being made up of resistance R3, R4, wherein the junction of resistance R3 one end and R4 one end connects feedback pin, resistance R3 the other end ground connection, the direct current supply pin of resistance R4 another termination current-control type pulse width modulating chip UC3842.
In the present embodiment, the power supply end of described current-control type pulse width modulating chip UC3842 also connects filter capacitor C2 positive pole, filter capacitor C2 negative pole ground connection.
In the present embodiment, described MOS pipe Q1 adopts IRF-PG407 type N-channel MOS to manage.
In the present embodiment, the power supply end trigger voltage of described current-control type pulse width modulating chip UC3842 is 16V.
Principle of work of the present utility model is: as shown in Figure 1, this switch power supply is by the compatible wave filter ZYH-EO-3A of major electromagnetic, rectification bridge heap D1, current-control type pulse width modulating chip UC3842 and transformer circuit are formed, universal design Uo=5V, Io=6A, Po=30W, switching power tube adopts IRF-PG407 type N-channel MOS to manage. Switching power tube circuit belongs to single-end flyback converters, and when switching power tube conducting, rectification diode VD4 ends, and electric energy is just stored in the first side winding N1 of high-frequency transformer T; When switching power tube turns off, VD4 conducting, the electric energy of the upper storage of N1 just passes to secondary side winding N2, and powers to the load after VD4, C10 rectifying and wave-filtering.
When just starting, the required+16V operating voltage of UC3842 is provided by R2, C2 circuit. 220v exchange obtains+300v high direct voltage through bridge rectifier filtering, then connects Vcc end after R2 step-down, utilizes the process of charging of C2 to make Vcc be raised to more than+16v, thus realizes starting. After switch power supply proceeds to normal operation, the high-frequency voltage on N3 through VD1 and C2 rectifying and wave-filtering, as the operating voltage of chip. UC3842 belongs to Current Control Mode PWM Switched, the voltage that electric current on N1 is set up on current sense resistor R10, add to the in-phase end that current detecting is stronger, compare with the error voltage Ur of end of oppisite phase, and then control exports the dutycycle of pulse, the peak inrush current flowing through switching power tube is controlled all the time by Ur. As long as the voltage on R10 reaches Ur value (Ur maximum value is 1v), stronger just upset, exports high level, by PWM latch zero setting, PWM is turned off. Owing to switching power tube is at shutdown moment, the leakage inductance of high-frequency transformer can produce point peak voltage, and N1 is upper can produce inverse electromotive force, C8, VD3, R11, R12, C9, VD2 can be utilized to form two-stage and absorb circuit, be shielded by switching power tube. VD1 ~ VD3 adopts fast recovery diode. Output rectifier and filter is VD4 and C10 composition again, and VD4 adopts low pressure schottky diode.
The cut-in voltage of input undervoltage locking circuit is 16v, and shutoff voltage is 10v, and time under-voltage, power tube turns off voluntarily. + 5.0v votage reference charges to C6 through R6, and C6 discharges through chip internal circuits again, so obtaining zigzag wave voltage at the 4th pin. Get R6=10K Ω, C6=4700PF, switching frequency=40KHz can be obtained. Voltage is compared in the output voltage UI of biased winding conduct after R3, R4 dividing potential drop. When the rising of electrical network voltage causes output voltage to raise, UI ↑ → Ur ↓ → Uo ↓, with reason, when the reduction of electrical network voltage causes output voltage to reduce, UI ↓ → Ur ↑ → Uo ↑, so just make output voltage Uo be stablized.
Real output waveform such as Fig. 2, passage 1 is 5v output voltage waveforms, and passage 2 is 5v output ripple, and peak peak value is about 200mv, and effect is better.
Below preferred embodiment of the present utility model is described in detail. It is to be understood that the those of ordinary skill of this area just can make many modifications and variations according to design of the present utility model without the need to creative work.Therefore, the technical scheme that all technician in the art can be obtained by logical analysis, reasoning, or a limited experiment on the basis of existing technology according to design of the present utility model, all should by the determined protection domain of claim book.
Claims (8)
1. a novel simple switch power supply, it is characterized in that: comprise the electromagnetic compatibility wave filter ZYH-EO-3A for filtering external interference signals, rectification bridge heap D1, current-control type pulse width modulating chip UC3842 and transformer circuit, described electromagnetic compatibility wave filter ZYH-EO-3A input terminus connects 220V and exchanges city's electricity, described electromagnetic compatibility wave filter ZYH-EO-3A output terminal connects rectification bridge heap D1, described rectification bridge heap D1 DC output end is successively by resistance R1, R2 is connected to the power supply end of current-control type pulse width modulating chip UC3842, described resistance R2 is connected to one end of primary N1, the power supply end of described current-control type pulse width modulating chip UC3842 is connected to one end of primary N3 by the Zener diode VD1 oppositely connected, the other end of described primary N1 connects by C8, VD3, R11, R12, C9, the inverse electromotive force two-stage of VD2 composition absorbs circuit, the other end ground connection of described primary N3, connect between described transformer secondary output N2 two ends and it is connected in series, by rectification diode VD4 and filter capacitor C10, the output rectifier and filter formed, rectification diode VD4 and filter capacitor C10 coupling end are DC output end.
2. novel simple switch power supply as claimed in claim 1 a kind of, it is characterised in that: described inverse electromotive force two-stage absorbs circuit and is respectively the second stage absorption circuit that first step be made up of electric capacity C8, Zener diode VD3, resistance R11 absorbs circuit and resistance R12, electric capacity C9, Zener diode VD2 form; Wherein VD3, R11 are in parallel, and VD3 positive pole is connected with electric capacity C8 one end, VD3 negative pole ground connection, the other end of the electric capacity C8 elementary N1 of the other end connection transformer; Described resistance R12, electric capacity C9 are in parallel, the resistance R12 of parallel connection, one end of electric capacity C9 one end elementary N1 of connection transformer, and the resistance R12 of parallel connection, the electric capacity C9 the other end pass through the other end of the oppositely Zener diode elementary N1 of VD2 connection transformer of serial connection.
3. a kind of novel simple switch power supply as claimed in claim 1, it is characterized in that: the pwm signal output terminal of described current-control type pulse width modulating chip UC3842 is connected to the grid of MOS pipe Q1 by resistance R7, the other end of the elementary N1 of drain electrode connection transformer of described MOS pipe Q1, source electrode contact resistance R10 one end of described MOS pipe Q1, described resistance R10 the other end ground connection, the source electrode of described MOS pipe Q1 is also connected to the current detecting end of current-control type pulse width modulating chip UC3842 by resistance R9.
4. a kind of novel simple switch power supply as claimed in claim 1, it is characterised in that: the votage reference pin of described current-control type pulse width modulating chip UC3842 connects the charge-discharge circuit being composed in series by resistance R6, electric capacity C6.
5. a kind of novel simple switch power supply as claimed in claim 1, it is characterized in that: the feedback pin of described current-control type pulse width modulating chip UC3842 connects the dividing potential drop circuit being made up of resistance R3, R4, wherein the junction of resistance R3 one end and R4 one end connects feedback pin, resistance R3 the other end ground connection, the direct current supply pin of resistance R4 another termination current-control type pulse width modulating chip UC3842.
6. a kind of novel simple switch power supply as claimed in claim 1, it is characterised in that: the power supply end of described current-control type pulse width modulating chip UC3842 also connects filter capacitor C2 positive pole, filter capacitor C2 negative pole ground connection.
7. a kind of novel simple switch power supply as claimed in claim 3, it is characterised in that: described MOS pipe Q1 adopts IRF-PG407 type N-channel MOS to manage.
8. a kind of novel simple switch power supply as claimed in claim 1, it is characterised in that: the power supply end trigger voltage of described current-control type pulse width modulating chip UC3842 is 16V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521135338.4U CN205319949U (en) | 2015-12-31 | 2015-12-31 | Novel simple and easy switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521135338.4U CN205319949U (en) | 2015-12-31 | 2015-12-31 | Novel simple and easy switching power supply |
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| CN205319949U true CN205319949U (en) | 2016-06-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100371A (en) * | 2016-06-22 | 2016-11-09 | 河海大学 | A kind of switching power circuit of pressure-stabilizing constant flow output |
| CN106604472A (en) * | 2016-12-30 | 2017-04-26 | 深圳Tcl数字技术有限公司 | Led drive circuit |
| CN107592007A (en) * | 2017-09-21 | 2018-01-16 | 深圳市华星光电技术有限公司 | Inverse-excitation type switch power-supply circuit |
| CN108322051A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of inverse-excitation type switch power-supply |
| CN110071642A (en) * | 2019-05-10 | 2019-07-30 | 佛山职业技术学院 | A kind of switching circuit and its control circuit, control method |
-
2015
- 2015-12-31 CN CN201521135338.4U patent/CN205319949U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100371A (en) * | 2016-06-22 | 2016-11-09 | 河海大学 | A kind of switching power circuit of pressure-stabilizing constant flow output |
| CN106604472A (en) * | 2016-12-30 | 2017-04-26 | 深圳Tcl数字技术有限公司 | Led drive circuit |
| CN106604472B (en) * | 2016-12-30 | 2019-05-31 | 深圳Tcl数字技术有限公司 | LED drive circuit |
| CN107592007A (en) * | 2017-09-21 | 2018-01-16 | 深圳市华星光电技术有限公司 | Inverse-excitation type switch power-supply circuit |
| CN108322051A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of inverse-excitation type switch power-supply |
| CN110071642A (en) * | 2019-05-10 | 2019-07-30 | 佛山职业技术学院 | A kind of switching circuit and its control circuit, control method |
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