CN101510103A - Secondary voltage relief switch stable voltage power source - Google Patents
Secondary voltage relief switch stable voltage power source Download PDFInfo
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- CN101510103A CN101510103A CNA2008102170529A CN200810217052A CN101510103A CN 101510103 A CN101510103 A CN 101510103A CN A2008102170529 A CNA2008102170529 A CN A2008102170529A CN 200810217052 A CN200810217052 A CN 200810217052A CN 101510103 A CN101510103 A CN 101510103A
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Abstract
The invention relates to electrics and electron, in particular to the technical field of the power supply. After the public terminal G6 of a series inductive resistance choke L6 secondary multi-winding rectifying circuit in an isolation transformer secondary later voltage-reducing switch voltage-stabilizing power supply is superimposed on the high-voltage end of the main output end capacitor C6 of a series switch power supply for forming a bootstrapping output end, the fundamental characteristics for the multi-winding voltage-stabilizing output is formed. The innovation of the invention optimizes the optimal economic efficiency and overall power efficiency of a front-grade isolation transformer coil, reduces the front-grade isolation transformer T secondary multi-winding phenomenon, and significantly reduces the overall cost.
Description
Technical field
The present invention relates to electrician, electronic technology field.Particularly relate to relevant switching power supply technical field and in TV or computer technology, use.
Background technology
Is the prior art switching power supply (called for short: Switching Power Supply), according to flowing through Switching Power Supply adjustment pipe direct current composition be/not short-circuit loss? Switching Power Supply can be divided into: series connection (transferring the sense buck) Switching Power Supply and (magnetic coupling) pressure swing type Switching Power Supply.
According to switch transformer primary coil and secondary each coil be/not allowance conducting simultaneously? Switching Power Supply can be divided into: recommend (AC transformation formula) Switching Power Supply and inverse-excitation type switch power-supply (that is: pure self-induction energy storage Switching Power Supply).
Inverse-excitation type switch power-supply: the conducting of secondary coil commutator tube, must close to have no progeny at primary coil and Switching Power Supply adjustment pipe and just can carry out, can only pure self-induction storage magnetic energy when guaranteeing the primary coil conducting, both conductings simultaneously of primary and secondary winding.This is with to recommend (AC mutual induction) pressure swing type power supply opposite.
Inverse-excitation type switch power-supply is the DC-DC transducer.Can be divided into: series connection inverse-excitation type and transformation inverse-excitation type two class Switching Power Supplies.But the tandem tap power supply is when the self-induction energy storage, and increasing has the direct current composition through to main output terminal load, can be as pressure swing type, and the whole short-circuit losses of direct current composition.So tandem tap power supply advantage is very outstanding.
Anti-violent change pusher-type switch power supply is divided into again: booster switcher power supply and lift Switching Power Supply two classes.
Booster switcher power supply, modal utilization are passive power factor corrective (PFC) circuit.The lift Switching Power Supply (is commonly called as: the paralleling switch power supply), can accomplish the advantage of isolating fully.Therefore utilization is the most extensive.
Magnetize behind the energy because inverse-excitation type switch power-supply all is elementary first self-induction, turn-off elementaryly again, emit energy by secondary commutation at last.There is not the mutual inductance problem in this process.In this class DC-DC transducer, the shortcoming of anti-violent change pusher-type switch power supply maximum: there is constant direction dc magnetization problem in switch transformer, therefore must strengthen the magnetic core air gap and just can overcome; It is very high that switching tube and commutator tube require to bear inverse peak voltage, so this pressure swing type Switching Power Supply design, can only apply to this low-power load occasion.Have the tandem tap power supply only and recommend the pressure swing type Switching Power Supply and can use large-power occasions.
Push-pull type Switching Power Supply body feature: (that is: at the DC-AC inverter, or: form the DC-AC-DC transducer on its basis).Half-bridge, bridge-type circuit are arranged, roughly the same push-pull power amplifier OTL, BTL circuit, only the power amplifier power tube is a magnifying state, and the push-pull type power adjustment pipe is an on off state.Though still have the flip-flop short-circuit loss when recommending the pipe conducting, but switch transformer is the alternating current that back and forth changes owing to flow through, so there is not the dc magnetization problem, withstand voltage lower when particularly switching tube turn-offs than anti-violent change pusher-type switch power requirement, and the push-pull type Switching Power Supply is made resonance (soft switch) state easily.Therefore recommend the pressure swing type Switching Power Supply is the research and development focuses always.
The tandem tap power supply can only connect by inverse-excitation type.And the pressure swing type Switching Power Supply can inverse-excitation type connects or recommends AC system and connects.All inverse-excitation type switch power-supply adjustment pipes and secondary power rectification pipe, conducting simultaneously, otherwise can't discharge behind the self-induction energy storage.
Is Switching Power Supply different with frequency by voltage stabilizing by-pass cock power adjustment pipe conducting/periodic ratio? can be divided into: wide switch power supply and frequency modulation (transferring wide simultaneously) Switching Power Supply are transferred in (pulse) of stabilized frequency.
The frequency modulation switch power supply uses the widest.Can be divided into the self-excitation free oscillation, (as: RCC) and integrated pure independent-excited quasi-resonance [that is: quasi-resonance] are (QR).[QR：quasi?resonant]。
Switching tube and secondary commutation pipe enter resonant condition after conducting finishes successively respectively, between this moment switching tube and secondary commutation Guan Youyi section turn off delay time after, just can enter next cycle switch pipe conducting state.
Transfer the wide switch power supply, the most common is the PWM mode.Fixing pattern of conducting phase is also arranged, fixing pattern (as: PRC vibration) of shutoff phase is also arranged.[PRC：pulse?ratio?control]。
After frequency modulation and the wide mutual set of accent, constitute Bottom-skip quasi-resonance pattern.Can ingenious restriction quasi-resonance (QR) maximum operation frequency and minimum working frequency fluctuation range during utilization.
Optimal mode is during standby: intermittently PRC vibration.
Is Switching Power Supply in the on off state different in kind that should need by the energizing switch power adjustment pipe? can be divided into self-activated switch power supply and pure independent-excited Switching Power Supply.
The present age integrated circuit driving switch pipe all be pure independent-excited Switching Power Supply.The discrete component Switching Power Supply nearly all is an auto-excitation type.
" power supply source " notion, not necessarily a power supply can be formed system by a plurality of power supplys.Relation also not necessarily in parallel.The Switching Power Supply master's load end that has may be powered to another Switching Power Supply.(such as: the elementary horizontal output stage of tv flyback transformer, liquid crystal backlight etc. belong to the secondary Switching Power Supply, and its preceding level power supply can be described as power supply first).The inventor is any tube device that is on off state, general term switching tube.
The tandem tap power supply is as electrical network Switching Power Supply first, and custom still is called the tandem tap power supply.Be used for by isolating transformer secondary after load, custom is called secondary step down switching regulator again, non-isolated buck formula (BUCK) Switching Power Supply.All be the same characteristic in fact.Referring to [Figure 1A example]: the shortcoming of tandem tap power supply maximum is: main output terminal is a wherein part of input end loop, can not separate input and main output terminal implicated relationship forever.Because during tandem tap power supply pipe V conducting, input end loop string is through the dual energy storage device of LC LC, must Automatic off switch pipe V after being full of the electric charge zero load every straight main output capacitor C, this peculiar " unloaded from closing " characteristic has limited the induction reactance choking coil L switch transformer T transmit power capabilities of holding concurrently.[" series connection induction reactance choking coil " error understanding is become " switch transformer ", must cause underloading or zero load can not " transformation " through-put power phenomenon].The why long-term hot movement root of colour TV tandem tap power supply that Here it is.(inventor is relating to series connection induction reactance choking coil secondary winding, also general term: the transformer secondary output winding, but to simple, strictness is called series connection induction reactance choking coil).
Switching mode power supply transformer is secondary first that the output of a plurality of winding channelings might be arranged for prior art.But only to wherein one the tunnel normally the maximum power load end carry out voltage stabilizing.It is the maximum load variable power as a result, might bring other winding voltage stabilizing fluctuation.Such as than the high-power backlight variable power of liquid crystal, must bring and unify other windings of transformer secondary output from this and export unstable phenomenon.So by load after the isolating transformer, also often will use step down switching regulator and replace traditional series amplification rheostatic voltage stabilizer, the low-voltage, high-current load is given in power supply after the voltage stabilizing.Prior art, except that anti-currentless partially high-frequency tuner tunable varactor diode 30V was given in power supply, any secondary step down switching regulator all was single output terminal.So run into the load circuit of different output voltages, corresponding step down switching regulator that just need be different.In recent years, the DC/DC technical development of non-isolation is rapid.Because a present cover electronic equipment or electronic system because of the load difference, can require power-supply system that a plurality of voltage retaining levels are provided.For example desktop PC has just required+12V, + 5V, + 3.3V, four kinds of voltages of-12V and standby+5V voltage. arrived on the motherboard, just require 2.5V, 1.8V, 1.5V even 1V etc. for this reason, can not provide many like this voltage output among the one cover AC/DC, and most of low-voltage power supply electric current is all very big.Therefore after switching mode power supply transformer secondary winding output first, often need a lot of step down switching regulators to export more low-voltage again.Can reduce cost and be improved to a total step down switching regulator multipath voltage regulation output? this is a problem to be solved in the present invention.For this reason:
Summary of the invention
If realize step down switching regulator is changed into many group winding voltage stabilizing outputs.At first must how to overcome step down switching regulator " unloaded " characteristic from closing?
Strictness says that " tandem tap power supply induction reactance choking coil " is to be misunderstood to be: " switching mode power supply transformer "." tandem tap power supply induction reactance choking coil " wants to have concurrently transformer transmitted power function pacing items:
Referring to [Figure 1A example]: because during tandem tap power adjustment pipe V conducting, input end loop string is through the dual energy storage device of LC LC, principle according to the series connection dividing potential drop: series connection induction reactance choking coil L secondary maximum transmission (voltage stabilizing) output power=UXL ~/Uc.Pc (MIN) promptly: behind series connection induction reactance choking coil L AC voltage drop (UXL ~)/tandem tap power supply master output capacitor C output dc voltage (Uc) ratio, multiply by tandem tap power supply master output capacitor C output minimum power Pc (MIN) again.The series connection induction reactance choking coil L voltage drop (UXL ~)=input terminal voltage-main output end voltage poor.
If L level of series connection induction reactance choking coil actual needs power is attempted greater than maximum transmitted (voltage stabilizing) the output power limit, the induction reactance of connecting so choking coil L secondary output voltage, so the rapid drop of maximum transmitted (voltage stabilizing) output power restriction phenomenon.Main afterflow rectifier U can not get the commutated current phenomenon.
Because series connection induction reactance choking coil L voltage drop (UXL ~)=input terminal voltage-main output end voltage is poor, so if want to improve series connection induction reactance choking coil L secondary winding maximum transmitted output power.Must strengthen the difference of input terminal voltage-main output end voltage and improve main output terminal output power.How to improve main output terminal output power? in input end and main output terminal voltage stabilizing value one regularly, uniquely can only improve main output terminal output current.For this reason, referring to [Fig. 1] example: the inventor: behind a public buck (BUCK) Switching Power Supply voltage stabilizing master output terminal, power supplys such as the output of energy multipath voltage regulation 5V, 12V, 20V need.It is characterized in that: L6 level of tandem tap power supply induction reactance choking coil increased a plurality of windings, the secondary winding that is increased, respectively by with reversed polarity commutating circuit that originally coil P on/off is opposite after common port G6 be superimposed upon the hot end of tandem tap power supply master output capacitor C6, behind the main output capacitor C6 of formation bootstrapping stack, formation to be organized over the ground (
) output terminal of different voltage stabilizing values, the load of different demands is given in corresponding power supply, makes main output terminal load current each the output terminal load current sum behind the above-mentioned winding rectifying and wave-filtering that increases that superposes again respectively.The essential characteristic of total step down switching regulator multipath voltage regulation output that Here it is.Driving circuit and terminal control circuit thereof that this Switching Power Supply adjustment pipe V6 is relevant can be that integrated circuit (IC) is formed or with reference to circuit [Fig. 5] example: form with the auto-excitation type voltage stabilizing control Driver Circuit (62) that discrete component is formed.
Can realize after the improvement according to as follows: after supposing a public buck (BUCK) Switching Power Supply voltage stabilizing master output terminal, can export 5V, 12V, 20V power supply by multipath voltage regulation.Because during tandem tap power supply pipe V conducting, go here and there through the dual energy storage device of LC LC in the input end loop, main output capacitor C6 maximum load current is exactly the most common 5V of being load.If this 5V load maximum current is 5A.The 12V load is got and is come from choking coil L6 secondary winding S4 by after the diode U11 reversed polarity commutation capacitor C4 filtering, is 2A along string stack back power supply to load current with main output capacitor C6 again.20V (18V) load (to audio power amplifier etc.), get and come from choking coil L6 secondary winding S5+S4 by after the diode U19 reversed polarity commutation capacitor C20 filtering, be 1A along string stack back power supply to load current with main output capacitor C6 again.By behind inventor's scheme implementation, tandem tap power supply master output end current is 5A+2A+1A=8A, meet tandem tap power supply induction reactance choking coil and want to have concurrently transformer transmitted power function pacing items: series connection induction reactance choking coil L secondary maximum transmission (voltage stabilizing) output power=UXL ~/Uc.Pc (MIN) promptly: behind series connection induction reactance choking coil L AC voltage drop (UXL ~)/tandem tap power supply master output capacitor C output dc voltage (Uc) ratio, multiply by tandem tap power supply master output capacitor C output minimum power Pc (MIN) again.
The outstanding advantage of the innovation is:
Reduce cost.Only use one (or two) total buck (BUCK) switching power supply multipath voltage regulation output, can satisfy the complete machine needs.Such as one of them total buck (BUCK) switching power supply, multipath voltage regulation output 20V, 12V, 5V.Another total buck (BUCK) switching power supply, multipath voltage regulation output 3.3V, 1.8V, 1V etc. again.For flat panel TVs such as liquid crystal, audio power amplifier, 12V, 5V power supply, conventional art all are from the many windings difference of isolating transformer rectification 20V, 12V, 5V.Referring to transformer L among Fig. 4 and T secondary winding.Can change into and increase a total buck of [Fig. 1] example (BUCK) switching power supply, multipath voltage regulation output 20V, 12V, 5V.Can improve the former isolating transformer coil optimal economic utilization factor.Reduce the secondary many windings phenomenon of the former isolating transformer.After the improvement specifically referring to [Fig. 4].
The innovation overcomes the conventional art step down switching regulator, and one tunnel output prejudice is only arranged.
The concrete detailed embodiment of advantage illustrates respectively.
Description of drawings
Figure of description has 2 page of 7 width of cloth.(comprising offset information Figure 1A).Accompanying drawing derives from and truly can be embodied as criterion.Figure 1A is a tandem tap power supply body feature.[Fig. 1] is character of innovation figure of the present invention.[Fig. 2], [Fig. 3] are that can to adopt the synchronous rectification scheme to power rectifier be good specific embodiment for the innovation of being correlated with.[Fig. 4] with the pairing schematic diagram of printed circuit board (pcb) in the concrete utilization of colour TV machine product, from slightly gradually thin, adopt and locally amplify that subitem is special to be described.[Fig. 5] is local relevant voltage stabilizing control Driver Circuit (62) among Fig. 1 Fig. 4.[Fig. 6] is the soft start function of relevant the innovation in [Fig. 4], brings each output end voltage change procedure, with the difference oscillogram of prior art.12V, different power supply marks such as 20V, 5V can be the different electrical power voltage values, in the same accompanying drawing except that VCC and primary coil P, identical accompanying drawing port label, can be connected.Each figure effect sees hereinafter explanation for details.(particularly element and the item thereof) that instructions and accompanying drawing are not explained is by legal or currently pass through that example is explained or with reference to explaining among other patents of inventor group." ф ", ": ", the variable or removable end of light symbolic representation.
Embodiment
Describe realization the innovation best way in detail below in conjunction with the accompanying drawing example.Preamble has been stated or has no longer been repeated in conjunction with continue to use prior art or in like manner should change etc.
In Fig. 1, Fig. 2, Fig. 4, Fig. 5 example, contain useful discrete component auto-excitation type driving circuit, can replace with any pure independent-excited integrated circuit (IC).
[Fig. 1] example: multichannel output 5V, 12V, 20V power supply after the voltage stabilizing of a public buck (BUCK) Switching Power Supply.Driving circuit and terminal control circuit thereof that this Switching Power Supply adjustment pipe V6 is relevant can be the auto-excitation type driving circuits that integrated circuit (IC) is formed or reference [Fig. 5] circuit (62) is formed with discrete component.This this voltage relief switch stable voltage power source input end: from Switching Power Supply first (preferably containing tandem type) transformer L level, with T level of other any isolation pressure swing type switching mode power supply transformers, respectively increase a winding, respectively separately by carrying out dual being used in combination after rectifier U25, the rectification of U24 reversed polarity.The independent rectifier U24 of rectifier U25 reversed polarity commutating ratio reversed polarity rectification output peak electricity kinetic potential wants high separately.When electrical network industrial frequency rectifying half-wave instantaneous voltage closes on the power frequency peak value, by switching mode power supply transformer L time level first after the electrical network rectification, through rectifier U25 rectification or circuit of synchronous rectification (25U) output power supply; When electrical network industrial frequency rectifying half-wave instantaneous voltage closed on the power frequency trough, another isolation pressure swing type switching mode power supply transformer (T) that automatic switchover is served as reasons stable was secondary, through rectifier U24 rectification or circuit of synchronous rectification (24U) output continued access power supply.The innovation adopts the preceding level power supply of this voltage relief switch stable voltage power source input end dual transformer secondary output winding alternating expression to distinguish the commutation supply voltage technical scheme separately, its advantage: can reduce total filter capacitance.
In addition, it is good the electromagnetic wire of transformer secondary output winding low-voltage, high-current being changed into the bandlet shape.
Synchronous rectification is to adopt the low special power metal-oxide-semiconductor of conduction voltage drop, replaces single commutation diode function, to reduce a new technology of rectifier loss.Be particularly suitable for low-voltage, high current load occasion.When making rectifier with power MOSFET, require grid voltage must with kept just finishing rectification function synchronously by the phase place of commutating voltage, so be referred to as synchronous rectification.Power rectifier U series, it is good can adopting the synchronous rectification scheme, particularly rectifier U6 among Fig. 1 can be replaced by circuit of synchronous rectification (6U) with reference in [Fig. 2] example.Can reduce the commutator tube conduction voltage drop and bring thermal losses.Getting L level of source prime power transformer reversed polarity commutator tube U25 in above-mentioned can be replaced by circuit of synchronous rectification (25U) by in [Fig. 3] example.Getting T level of source prime power transformer reversed polarity commutator tube U24 in above-mentioned can also can be replaced by circuit of synchronous rectification (24U) by in [Fig. 3] example.Synchronous rectification MOS switching tube UK25 or the preposition driven in synchronism of UK24 can be connected in corresponding transformer L or T the level other end by selecting light J25 or J24.After former filter capacitor C62 also can remove, increase impedor L25 choked flow step-down after, again by capacitor C 62 filtering.After the impedor L25 that is increased also passes through circuit of synchronous rectification (25L), the fly-wheel diode U25L function that replaces traditional.MOS switching tube in above-mentioned in the circuit of synchronous rectification all adopts transformer-coupled auto-excitation type synchronous rectification mode, realizes synchronous rectification.Can save the advantage of synchronous rectification integrated circuit special chip.
Because any electronic product commutator tubes at different levels or the parallel connection of series amplification rheostatic voltage stabilizer back be the high capacity filter capacitor very, the start dash current is very big to commutator tube harm, the present inventor was benchmark voltage stabilizing value in any stabilized voltage supply a fixed value originally, was improved to: rise to the voltage stabilizing output valve from zero output magnitude of voltage gradual slow.Owing to only need increase an electrochemical capacitor in parallel or capacitance-resistance charge circuit scheme again at the voltage-reference diode two ends.As: [Fig. 4] example: direct sample is compared amplifying circuit (431) middle resistance R 32T, C32T or is increased resistance R 31T capacitor C 31T, enter about 6 to 8 milliseconds of stable state voltage stabilizing output valve time during prior art stabilized voltage supply soft start, and the innovation is extended for more than 60 milliseconds, and making flows through commutator tube or adjust the pipe peak point current reduces by more than 50.Owing to just start shooting moment, microprocessing systems does not participate in, is switching power supply in normal operating conditions or holding state? for this reason: the innovation need not microprocessing systems participations such as CPU in each master switch process, be forced to holding state without exception.Because this technology is synchronized with microprocessing systems master switch and reseting period thereof just.So can be used to prevent that microprocessing systems is soft, hardware damage is favourable.It is characterized in that: Switching Power Supply operate as normal/standby commutation circuit (5B) input end without exception not connecting resistance and be directly connected in cpu power command end PR after the input end series resistor removed (or being 470 Europe after reducing) over the ground; Increased a biasing resistor R902H of TongYuan, the biasing resistor R902H of this TongYuan branch road is got the required preposition input end power supply of stabilized voltage supply VCC-SY such as coming from micro controller.That is: standby continued access power supply (10) output terminal.Therefore, can save intermediate circuit between standby commutation circuit input end and the cpu power command end.[Fig. 6] is the soft start function of relevant the innovation in [Fig. 4], brings main steady load end+B voltage change process, with the difference oscillogram of prior art.(thick line is the innovation waveform, and non-overlapped fine rule is a prior art different wave shape part).
[Fig. 1] example: self-activated switch power supply adjustment pipe V6 also is an oscillating tube, by a transformer-coupled winding N2, by serial connection capacitance-resistance timing element RB5, CB5, constitutes the positive feedback network identical with the primary coil on/off again.Switching tube V6 input end is given in power supply.Under starting resistance R16 effect, produce self-sustained oscillation.Therefore, self-excited switching power supply converter is very reliably succinct.This self-activated switch power supply voltage stabilizing loop is also very simple.Form than amplifying circuit (431) and terminal pulse modulator tube (that is: whole keyholed back plate) VP5 by sample circuit and error ratio.Whole keyholed back plate VP5 is parallel to switching tube V6 input end, is controlling the positive feedback network and is discharging and recharging the time.Can make switch adjust pipe and be in the wide or modulating frequency and width on off state of frequency stabilization accent.Detailed local figure is referring to [Fig. 5] example.By diode VH13 resistance R H13 branch road, be connected in operate as normal/standby commutation circuit (5B) collector JW12 during standby.Make this secondary step down switching regulator (BUCK), when standby, be in by off state.Referring to [Fig. 4] example.Sample circuit and error ratio are JW6, W3T, W31T than amplifying circuit (431) voltage-reference diode item, can choose one of them wantonly.If selecting W31T, WHL is reference voltage, then item W3T, JW6 are light; If selecting JW6 is reference voltage, then item W31T, WHL are light, and W3T is resistance or light; If selecting W3T is reference voltage, then item W31T, JW6, WHL are light.Relevant with transformer T can adopt inverse-excitation type or recommend the AC system body feature.
Instructions and accompanying drawing parameter are only done reference for example, use former adjustable variable element.Many for the scheme of appointing variable selection in the accompanying drawing, circuit board has versatility and compatibility, can change flexibly on demand.The element that need not can be removed or short circuit.Audio power amplifier can change into from step-down switching power input power supply again.The innovation scheme can directly apply to integrated circuit and make and implement, particularly unusual shutdown unit (15), switching tube etc.The innovation can directly or be expanded utilization other any electrician or electronic technology fields.The innovation also can directly be used for the Switching Power Supply first that electrical network must implication.
The preferred embodiment that the above is only created for the present invention; be not limited to the present invention's creation; all in the present invention creation spirit and principle within done any modification, be equal to and replace and improvement etc., all should be included within the protection domain of the present invention's creation.
Claims (8)
- A kind of secondary voltage relief switch stable voltage power source, after its input end is got and is come from the rectification of any disconnector transformer secondary output, this voltage relief switch stable voltage power source, also comprise tandem tap power supply induction reactance choking coil L6, main output capacitor C6, Switching Power Supply adjustment pipe V6, main fly-wheel diode U6 and surely control relevant circuit such as loop (431) and form, it is characterized in that:1. L6 level of tandem tap power supply induction reactance choking coil increased a plurality of windings, the secondary winding that is increased, respectively by with reversed polarity commutating circuit that originally coil P on/off is opposite after common port G6 be superimposed upon the hot end of tandem tap power supply master output capacitor C6, after forming the main output capacitor C6 of bootstrapping stack, constitute many groups output terminal of (⊥) different voltage stabilizing values over the ground, the load of different demands is given in corresponding power supply, makes main output terminal load current each the output terminal load current sum behind the above-mentioned winding rectifying and wave-filtering that increases that superposes again respectively.
- 2. secondary voltage relief switch stable voltage power source is characterized in that:This secondary voltage relief switch stable voltage power source input end is when electrical network industrial frequency rectifying half-wave instantaneous voltage closes on the power frequency peak value, by switching mode power supply transformer L time level first after the electrical network rectification, through rectifierU25 or circuit of synchronous rectification (25U) output power supply; When its input end closed on power frequency trough value at electrical network industrial frequency rectifying half-wave instantaneous voltage, another isolation pressure swing type switching mode power supply transformer (T) that automatic switchover is served as reasons stable was secondary, through rectifier U24 or circuit of synchronous rectification (24U) output continued access power supply.
- 3. a kind of secondary voltage relief switch stable voltage power source according to claim 1 is characterized in that: main fly-wheel diode U6, and can be by circuit of synchronous rectification (6U) replacement mutually.
- 4. a kind of secondary voltage relief switch stable voltage power source according to claim 2 is characterized in that:Get L level of source prime power transformer reversed polarity rectifier U25, can be by circuit of synchronous rectification (25U) replacement mutually.
- 5. a kind of secondary voltage relief switch stable voltage power source according to claim 2 is characterized in that: get T level of source prime power transformer reversed polarity commutator tube U24, and can be by circuit of synchronous rectification (24U) replacement mutually.
- 6. a kind of secondary voltage relief switch stable voltage power source according to claim 1 is characterized in that:Self-activated switch power supply adjustment pipe V6 also is an oscillating tube, by a winding N2 of transformer L6 coupling, by serial connection capacitance-resistance timing element RB5, CB5, constitutes the positive feedback network power supply identical with the primary coil on/off and gives switching tube V6 input end again; Under starting resistance R16 effect, produce self-sustained oscillation;This self-activated switch power supply regulation loop route sample circuit and error ratio are formed than amplifying circuit (431) and whole keyholed back plate VP5; Whole keyholed back plate VP5 is parallel to switching tube V6 input end, is controlling the positive feedback network and is discharging and recharging the time, can make switch adjust pipe and be in the wide or modulating frequency and width on off state of frequency stabilization accent; By diode VH13 resistance R H13 branch road, be connected in operate as normal/standby commutation circuit (5B) collector JW12 during standby, make this step down switching regulator (BUCK) again, when standby, be in by off state;Sample circuit and error ratio are JW6, W3T, W31T than amplifying circuit (431) voltage-reference diode item, can choose one of them wantonly; If selecting W31T, WHL is reference voltage, then item W3T, JW6 are light; If selecting JW6 is reference voltage, then item W31T, WHL are light, and W3T is resistance or light; If selecting W3T is reference voltage, then item W31T, JW6, WHL are light.
- 7. a kind of secondary voltage relief switch stable voltage power source according to claim 1 is characterized in that:Direct sample is compared in the amplifying circuit (431), increase resistance R 32T, capacitor C 32T, or increase resistance R 31T capacitor C 31T and constitute soft starting circuit, make each output end voltage rise to the voltage stabilizing output valve, thereby the contrast peak current value reduce by more than 50 before making flow through commutator tube U11, U19 or the improvement of Switching Power Supply adjustment pipe V6 peak point current ratio from zero output magnitude of voltage gradual slow.
- 8. a kind of secondary voltage relief switch stable voltage power source according to claim 1 and 2, it is characterized in that: when described circuit of synchronous rectification replaces pure diode rectifier, MOS switching tube in its circuit of synchronous rectification adopts transformer coupled self-excitation synchronous driving mode to realize synchronous rectification, can save relevant synchronous rectification integrated circuit special chip and drive.
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| CN106487081A (en) * | 2016-12-21 | 2017-03-08 | 江西佰仕通电子科技有限公司 | Mains charger circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082501A (en) * | 2010-12-20 | 2011-06-01 | 华为技术有限公司 | Circuit for starting power supply units and a power module circuit employing same |
| CN102082501B (en) * | 2010-12-20 | 2013-03-27 | 华为技术有限公司 | Circuit for starting power supply units and a power module circuit employing same |
| CN102368813A (en) * | 2011-10-25 | 2012-03-07 | 深圳麦格米特电气股份有限公司 | Voltage-stabilizing circuit |
| CN102832834A (en) * | 2012-08-31 | 2012-12-19 | 长城汽车股份有限公司 | Efficient linear adjustable transformer |
| CN102832834B (en) * | 2012-08-31 | 2015-04-22 | 长城汽车股份有限公司 | Efficient linear adjustable transformer |
| CN104953847A (en) * | 2015-06-29 | 2015-09-30 | 航天长峰朝阳电源有限公司 | Isolated DC/DC (direct current/direct current) power supply module adopting ultra-wide input range and ultra-low output voltage |
| CN106487081A (en) * | 2016-12-21 | 2017-03-08 | 江西佰仕通电子科技有限公司 | Mains charger circuit |
| TWI789786B (en) * | 2020-06-30 | 2023-01-11 | 加拿大商萬國半導體國際有限合夥公司 | Power stage |
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Application publication date: 20090819 |