CN1692544A

CN1692544A - Green switch power supply with standby function and its IC

Info

Publication number: CN1692544A
Application number: CN03808179.2A
Authority: CN
Inventors: 陈卫斌
Original assignee: Individual
Current assignee: Nanjing Tonghuaxin Electronic Co ltd
Priority date: 2002-04-18
Filing date: 2003-01-27
Publication date: 2005-11-02
Anticipated expiration: 2023-01-27
Also published as: CN100505493C

Abstract

A switch power supply with standby function is disclosed. The power supply can satisfy the need of the green environment protection. And a single ended green switch power supply IC or thick film or modular circuit design with standby function is disclosed, too. It comprises a standby power supply, a main power supply, a PFC device, and a supplemental circuit, wherein a remote control signal is transmitted to main control circuit in response to a main error signal to control main power supply. A method for preventing switch power current from overload and saturation is disclosed too. Finally, the present invention also provides a green power supply with standby function as well as its IC associated with digital processing highly qualified PFC, and a PC standard (such as ATX, ATX12, SSI) computer switch power supply.

Description

Green switch power supply with standby function and its IC

Environment protection switch power supply and its IC technical fields containing idle function：

It is more particularly to a kind of to meet the environment protection switch power supply containing idle function of environment protection requirement the invention belongs to Switching Power Supply design field（Hereinafter referred to as environment protection switch power supply）, by standby power,（Remote control machine open/close）(PFC refers to APFC below by main power source, PFC）Device and auxiliary circuit composition, are designed using monolithic environment protection switch power supply IC or thick film circuit or modular circuit, remote signal with main error signal remote-controlled mains power；And more preferably to implement what the present invention was developed, a kind of single-ended mixed switch power source translation circuit, it is a kind of to prevent the method and its Switching Power Supply, IC of switch power supply current overload and saturation, a kind of digital processing high-quality PFC methods and its device, IC, a kind of PC standards（Such as ATX, ATX12, SSI）Computer switching power supply.Background technology：

On Switching Power Supply, there is DC-DC (to refer to dc source all the way and be transformed to another road or all the way above dc source）Or AC-DC (refers to AC power and is transformed to all the way or all the way above dc source）Conversion, isolated or non-isolated translation circuit, boosting（Boost type）Or decompression（Buck types）Translation circuit, CCM (continuous current modes）Or DCM (discontinuous current modes）, etc. classification or define；Its isolated translation circuit has monofocal（Inverse-excitation type, positive activation type）, double-end type（Push-pull type, semibridge system and full-bridge type）Structure；Converter technique has hard switching conversion, Sofe Switch（Or resonant switch or zero switch）Conversion；Control technology has PFM, and (pulse frequency is adjusted）Mode and PWM (pulse width modulations）Mode, voltage-type and current mode；Etc..No matter how above-mentioned known technology is classified and defined, how using various translation circuits and control technology, various switching power circuits can be reduced to：Translation circuit, including power tube, transformer or inductance, all the way or all the way above rectifying and wave-filtering output circuit, wherein, power tube, monofocal has a power tube, and double-end type has many power tubes, there are one or more than one auxiliary power pipe using soft switch conversion, inductance, for simple non-isolation DC-DC conversion, the determination meaning of translation circuit Taste the Switching Power Supply using inductance or monofocal or double-end type, hard switching or Sofe Switch etc.；（Voltage or electric current etc.）Feedback circuit, including sample circuit, error amplifier, also feedback isolation circuit sometimes, the signal such as the voltage or electric current of sampling circuit samples output circuit send error amplifier to compare and amplify, error amplifier output error signal；Circuit, including pulse modulated circuit and drive circuit are controlled, pulse modulated circuit there are PFM modes（There are PFM circuits and pulse width shaping circuit, be of little use）, PWM mode（There are pwm circuit and oscillator, commonly use）Basic pulse is generated with other manner and according to error signal, there is the complementary dipulse generative circuit of frequency dividing using double-end type, there is Sofe Switch multiple-pulse generative circuit using soft switch conversion, basic pulse or dipulse or multiple-pulse send drive circuit driving power pipe, usually, error signal is bigger, and pulse duty factor is bigger, power tube peak point current is higher, and transformer is more easily saturated；Auxiliary circuit, chooses, wherein protection circuit has the protection circuits such as low-voltage, high voltage, upper limit current as needed in the auxiliary circuits such as start-up circuit, protection circuit, reference circuits, EMC circuits, AC rectification filter circuit.When Switching Power Supply starts or overloads, transformer or the easy saturation of inductance, the easy overcurrent of power tube；Therefore, known technology is Switching Power Supply IC (such as UCx842, TOP210）Using upper limit current protection circuit, i.e., immediately turn off power tube when up to upper limit current, it is desirable to control circuit to there is quick-reaction capability and power tube to rapidly switch off ability, otherwise can still exist and damage the potential safety hazard such as transformer or power tube.On start-up circuit, known technology has resistance starting circuit and can turn off constant-current source start-up circuit.

On monofocal translation circuit, there are single-ended flyback translation circuit and single-ended forward type translation circuit, wherein single-ended forward type translation circuit needs magnetic reset circuit, suitable for the larger Switching Power Supply of power.

On PFC (APFCs）, there is Single-phase PFC and three-phase PFC, CCM

(continuous current mode）Or DCM (discontinuous current modes）Boosting, boosting+decompression and inverse-excitation type conversion, what is matched with DCM has the technologies such as constant frequency control, constant on-time control and homalographic control, what is matched with CCM has the technologies such as peak value comparison method, Average Current Control and hysteretic loop current control, hard switching and soft switch technique, etc..No matter how above-mentioned known technology is classified and defined, how using various translation circuits and control technology, various PFC devices can be reduced to：Translation circuit, including power tube, transformer or inductance, output circuit, wherein, There are one or more than one auxiliary power pipe and its soft switch conversion circuit using soft switch conversion, inverse-excitation type conversion uses transformer；Feedback circuit, including sample circuit, error amplifier, the voltage signal of sampling circuit samples output circuit send error amplifier（Its frequency bandwidth typically takes

1 0-20HZ) output error signal；Control circuit, including pulse modulated circuit and drive circuit, error signal send pulse modulated circuit, drive circuit driving power pipe, have a different pulse modulated circuits using different translation circuit and control technology, but be commonly used there is constant on-time to control circuit（Such as UC3852, specific control method：When power tube is turned on, inductive current rises, and the error signal that ON time is exported by error amplifier is determined；When power tube is turned off, inductive current declines；When inductive current drops to zero, power tube is turned on again, and circuit is operated in DCM and CCM critical point）, Average Current Control circuit（Such as UC3854, there are multiplier, current error amplifier, PWM and oscillator）With inverse-excitation type conversion control circuit（It is identical with single-ended DC-DC conversion control circuits）, such as also have soft switch control circuit using soft switch conversion；Auxiliary circuit, in the auxiliary circuits such as start-up circuit, protection circuit, reference circuits, EMC circuits, ac rectifier according to PFC devices the need for choose.In order to prevent PFC devices output voltage from bringing potential safety hazard more than the upper limit, known technology is in design of feedback loop characteristic, balance has been done in terms of the capacity of selection output capacitance, power factor (PF), total harmonic distortion or has been sacrificed, this to reduce power factor (PF) in heavy duty, adds total harmonic distortion；Even so, when input voltage exceedes design load or output switchs to underloading by heavy duty suddenly, due to the reason such as voltage error feedback characteristics or input voltage filtering, control circuit may be not aware that output voltage exceedes the upper limit（Such as UCx852, UCx854, ML4803 Reference Design）, there is potential safety hazard.

On environment protection switch power supply, including standby power（Or Industrial Frequency Transformer rectification standby power, general to require output within several watts to more than ten watts, power consumption is more low better under immunization with gD DNA vaccine, and current advanced level is less than 0.2W for 220VAC), main power source（Usually, main power source can export more than tens watts under normal condition, and main power source is closed under holding state）, PFC (or passive PFC) device, EMC circuits etc. are also needed for the larger environment protection switch power supply of power output；Current design is that standby power, main power source are separated design；Meanwhile, people increasingly focus on standby power design and the design of single Switching Power Supply, are made one without obvious motivation The characteristics of consider environment protection switch power supply, take Synthesized design method thus more effectively reduce cost.On standby power, common design is to use civil power transformer linear stabilized power supply, but is difficult in adapt to require higher and higher environmental protection index；Or another preferable scheme is to use independent standby switches power supply, such as using the design of TOP series IC Switching Power Supplies, but cost is higher than linear stabilized power supply.On main power source, currently without special main power source IC (more without special environment protection switch power supply IC), but single Switching Power Supply IC designs are used.According to current optional device（Such as TOP series, TNY series, TL494, UCx842, ML4803, MC44608, UCx854, UCx852 IC) and design, designed environment protection switch power supply is not that cost is higher, can not exactly meet the design objective of environment protection switch power supply（Mainly stand-by power consumption is larger）.The content of the invention：

Present invention aims to overcome that the weak point of known technology, propose it is a kind of can meet environment protection requirement, it is more inexpensive or high-quality, by standby power or unit,（Remote control machine open/close）The environment protection switch power supply and its IC of main power source or unit, PFC devices or unit and auxiliary circuit composition;A kind of single-ended mixed switch power source translation circuit；It is a kind of to prevent the method and its Switching Power Supply, IC of switch power supply current overload and saturation;A kind of digital processing high-quality PFC methods and its device, IC;A kind of PC standards（Such as ATX, ATX12, SSI）Computer switching power supply.Environment protection switch power supply proposed by the present invention, including standby power,（Remote control machine open/close）Main power source and auxiliary circuit, or including PFC devices, standby power, main power source and auxiliary circuit, wherein, there is a remote signal to send main power source remote-controlled mains power machine open/close, standby power is at least main power source start and provides working power, and the direct-flow input end of standby power and the direct-flow input end of main power source are altogether；The standby power, including standby translation circuit, standby feedback circuit, readiness control circuit and standby auxiliary circuit, wherein readiness control circuit and standby power direct-flow input end are altogether；Or the standby power uses RCC Switching Power Supplies or Industrial Frequency Transformer dc source；The main power source, including primary transform circuit, primary feedback circuit, main control circuit and main auxiliary electricity Road, wherein main control circuit and main power source direct-flow input end are altogether；The auxiliary circuit, chooses as needed in the circuits such as electrifying startup circuit, AC rectification filter circuit, reference circuits, EMC circuits；The PFC devices, including PFC translation circuits, PFC feedback circuits, PFC control circuit and PFC auxiliary circuits, or passive PFC devices are used, at least export the direct-flow input end as main power source all the way if using PFC devices；

The standby power, standby translation circuit, at least including standby power pipe, standby transformer, all the way or all the way more than standby rectifying and wave-filtering output circuit（Referred to as standby output, standby output circuit）In order to reduce cost, it is general to use single-ended flyback translation circuit, need standby power during relatively high power to use single-ended forward type or single-ended hybrid translation circuit, directly drive standby power pipe by readiness control circuit, and seldom using Sofe Switch and the translation circuit of double-end type；Standby feedback circuit, using standby isolation feedback circuit or standby not isolation feedback circuit；Standby isolation feedback circuit includes standby sample circuit, standby error amplifier and standby isolation circuit（Light-coupled isolation typically is used, also can be using other manner isolation）, the voltage signal of the standby standby output of sampling circuit samples, standby error amplifier is sent, standby optocoupler electric current is produced and exports standby error signal through standby isolation circuit, and the smaller then standby error signal of standby optocoupler electric current is bigger；Standby not isolation feedback circuit includes standby sample circuit, standby error amplifier, standby sampling circuit samples after standby Transformer Winding rectifying and wave-filtering can as the working power of readiness control circuit the voltage signal proportional to standby output voltage, send standby error amplifier to export standby error signal, standby not isolation feedback circuit is applied to require the not high occasion of standby output voltage precision and have lower cost；Readiness control circuit, at least include standby pulse modulated circuit and treat drive circuit, standby pulse modulated circuit produces standby pulse according to standby error signal, directly sent using the standby pulse of the standby translation circuit of monofocal and treat drive circuit, treat that drive circuit drives standby power pipe, standby pulse modulated circuit has PFM modes, PWM mode or other manner, there are standby pulse frequency regulation circuit and standby pulse width shaping circuit using PFM modes, have standby pulse width regulating circuit and standby oscillator using PWM modes；Standby auxiliary circuit, chooses as needed in the circuits such as idle protection circuit, standby voltage monitoring circuit；

The main power source, primary transform circuit, at least including main power tube, main transformer, one Road or all the way main rectifying and wave-filtering output circuit of the above（Referred to as main output, main output circuit）, it is general to directly drive main power tube using monofocal primary transform circuit, by main control circuit in order to reduce cost, monofocal Sofe Switch primary transform circuit can be used when requiring conversion efficiency；Primary feedback circuit, using main isolation feedback circuit, at least including main sample circuit, main error amplifier, main isolation circuit（Light-coupled isolation typically is used, also can be using other manner isolation）, remote control circuit, the voltage signal of the main main output of sampling circuit samples, send main error amplifier, generation key light coupling electric current to export main error signal through main isolation circuit, remote control circuit uses light-coupled isolation（Also can be using other manner isolation）Main control circuit is sent by remote signal；Main control circuit, at least forbids circuit including main pulse modulation circuit, main drive circuit and main power source（Other circuits are also such as needed using double-end type and/or soft switch conversion circuit）Main power source forbids circuit to force main drive circuit output low level to turn off main power tube if remote signal is closes, and otherwise main pulse modulation circuit produces main pulse according to main error signal, directly send main drive circuit, main drive circuit driven main power tube using monofocal primary transform circuit main pulse（Usual monofocal is using direct drive）, main pulse modulation circuit has PFM modes, PWM mode or other manner, has main pulse frequency to adjust circuit and main pulse width shaping circuit using PFM modes, has main pulse adjustment circuit and master oscillator using PWM mode；Main auxiliary circuit, chooses as needed in the circuits such as main protection circuit, principal voltage monitoring circuit；

The PFC devices, PFC translation circuits, at least including PFC power tubes, PFC transformers or PFC inductance, all the way or all the way above PFC output circuits, wherein, inverse-excitation type conversion uses PFC transformers；PFC feedback circuits, including PFC sample circuits, PFC error amplifiers, the voltage signal of PFC sampling circuit samples PFC output circuits, send PFC error amplifiers export PFC error signals；PFC control circuit, at least including PFC pulse modulated circuits and PFC drive circuits, PFC error signals send PFC pulse modulated circuits, PFC drive circuits driving PFC power tubes；PFC auxiliary circuits, choose as needed in the circuits such as PFC start-up circuits, PFC protection circuits, ac rectifier.

Or the main power source, send main control circuit remote-controlled mains power to open or close with main error signal using remote signal；Main control circuit have a working power and primary feedback circuit without working power when main error signal be less than threshold value（Generally minimum value）；Main error is forced when remote signal is pass Signal is less than threshold value（Or minimum value）, when remote signal is to open to main error signal without effect, it is that pass and main control circuit close main power source that remote signal is thought if main error signal is less than threshold value；The threshold value is main error signal minimum value（Usually 0) and maximum（Usually 100%) between arbitrary value, generally maximum part, the conversion efficiency of main power source when main power source opens or closes machine and is conducive to improving underloading is easily judged when threshold value is desired value, it is that 25% and main power source load are less than 25% such as to set threshold value, then machine open/close is circulated work by main power source；Therefore above-mentioned main power source partial circuit is changed into：Remote control circuit forces main error signal to be less than threshold value without independent isolation circuit when remote signal is pass（Such as force to adjust the voltage signal of main output or force adjustment key light coupling electric current or directly the working power method of cut-out primary feedback circuit）, and remote signal does not work for remote control circuit when opening, and the voltage signal of the main main output of sampling circuit samples, send main error amplifier, generation key light coupling electric current to export main error signal through main isolation circuit；Preferably, when the voltage signal of main output is more than setting value, key light coupling no current, main error signal are minimum, and otherwise the more big then key light coupling electric current of the voltage signal error of main output is bigger, main error signal is also bigger；Main power source forbids circuit, monitor the main error signal from primary feedback circuit, remote signal is thought if main error signal is less than threshold value to close, forcing main pulse modulation circuit not export pulse and main drive circuit output low level or the method for other positive closing main power sources, otherwise main pulse modulation circuit produces main pulse, main drive circuit driven main power tube according to main error signal（Usual monofocal is using direct drive）；To ensure that main error signal is less than threshold value when primary feedback circuit is without working power, can be in main control circuit using resistance or the main error signal of constant-current source drop-down input.

Environment protection switch power supply of the present invention, it is characterised in that use a piece of environment protection switch power supply IC, at least integrated readiness control circuits of the IC, main control circuit and auxiliary circuit；The auxiliary circuit, including reference voltage source, start-up circuit, biasing circuit etc., reference voltage source provides reference voltage for internal circuit, and start-up circuit is that internal circuit sets up initial operation conditions, and biasing circuit is that internal circuit sets up biasing；When standby pulse modulated circuit and main pulse modulation circuit all use PWM mode and identical working frequency, standby pulse modulated circuit and main pulse modulation circuit share PWM oscillators, there is lower cost；The IC is also integrated with PFC error amplifiers and PFC control circuit；The standby of operating voltage that the IC is also integrated with the IC that samples is adopted Sample circuit and standby error amplifier, generally provided using the environment protection switch power supply of the IC, by standby power maximum operating voltage that working power, the standby feedback circuit in set inside limit the IC, still can using standby isolation feedback circuit and internal standby feedback circuit and use but the restricted standby output voltage of internal standby feedback circuit effect, the IC be particularly suitable for use in it is not high to standby output voltage required precision, without standby isolation circuit, more inexpensive environment protection switch power supply.

Environment protection switch power supply of the present invention, it is characterised in that remote signal send main control circuit with main error signal, using a piece of main power source IC, at least integrated main control circuits of the IC.

Environment protection switch power supply of the present invention, it is characterised in that use a kind of green powered-down source thick film circuits of Jian, the thick film circuit at least includes readiness control circuit, main control circuit；The thick film circuit preferably also includes standby feedback circuit, primary feedback circuit；The thick film circuit also includes PFC feedback circuits and PFC control circuit.

Environment protection switch power supply of the present invention, it is characterised in that use a kind of environment protection switch power supply modular circuit, the modular circuit at least includes readiness control circuit, standby feedback circuit, main control circuit, primary feedback circuit；The modular circuit preferably also includes standby translation circuit；The modular circuit also has PFC feedback circuits and PFC control circuit.

A kind of PC standards（Such as ATX, ATX12, SSI）Green computer Switching Power Supply, using environment protection switch power supply of the present invention, at least including standby power, main power source；The standby translation circuit of the standby power uses monofocal translation circuit；The primary transform circuit of the main power source uses single-ended hybrid or single-ended forward type translation circuit；The green computer Switching Power Supply also includes PFC devices.

The present invention proposes a kind of single-ended mixed switch power source translation circuit, is at least all the way single-ended forward type output and is at least single-ended flyback output all the way, arbitrarily all the way single-ended forward type output can with certain all the way single-ended flyback output go the same way；It is above-mentioned it is understood that single-ended forward type pulse current is exported, exciting current do not return to direct-flow input end（Winding magnetic reset）But the output end of Switching Power Supply is released to by secondary windings（The process of releasing is equal to single-ended flyback）；The secondary windings is independent secondary winding or shared with other normal shocks output winding, because the energy of exciting current may be designed as the energy changed much smaller than normal shock, therefore the larger output end of optional power output all the way is released exciting current when needing multiple-channel output；It is typically designed single-ended hybrid conversion During circuit, its input equivalent magnetic resetting voltage, which is less than highest, allows DC input voitage and output end umber of turn less, therefore, advantageously reduce switching power tube it is pressure-resistant, suitable for broader input voltage and simplify the manufacture of switch transformer.

The present invention proposes a kind of method for preventing switch power supply current overload and saturation, it is characterised in that comprise the following steps：

1) whether detection primary or inductance or power tube current exceed upper limit current；

If 2) exceed upper limit current, the adjustment of adjustment signal or Indirect method error signal are produced so that within next or several impulse modulation cycles, dutycycle diminishes, and primary or inductance or power tube peak point current diminish.The error signal is the output signal of error amplifier or the input signal of pulse modulated circuit；The alignment error signal is direct alignment error signal；The Indirect method error signal is to use the input signal of alignment error amplifier or adjust the Indirect method methods such as the output signal of sample circuit, reaches the purpose of alignment error signal.

Above-mentioned step 2) specific method can be；When detecting super upper limit current, by error signal adjustment once, adjustment amount is a fixed value.

Above-mentioned step 2) specific method can also be；When detecting super upper limit current, current and in multiple impulse modulation cycles continuously adjust error signal below, adjustment amount is by greatly to zero;During the continuously adjustable, if detect super upper limit current again, adjustment process restarts, and adjustment amount is again by greatly to zero.

Described step 2) specific method, preferably alignment error signal, error amplifier output preferably open circuit, which pulls up to export, simultaneously a load capacitance, and pressure is adjusted to capacitance charge of releasing.

The present invention proposes a kind of Switching Power Supply using the above method, is the anti-saturation Switching Power Supply of antioverloading, including：Translation circuit（Including power tube, transformer or inductance, all the way or all the way above rectifying and wave-filtering output circuit, also soft switch circuit etc., is known all kinds of translation circuits sometimes）, feedback circuit（Including sample circuit, error amplifier, there is feedback isolation circuit sometimes）, control circuit（Including pulse modulated circuit and drive circuit, pulse modulated circuit has PFM modes and PWM mode or other manner, there is pulse frequency to adjust circuit and pulse width shaping circuit using PFM modes, have pulse width regulating circuit and oscillator using PWM mode, use Double-end type also has the complementary dipulse generative circuit of frequency dividing, also has Sofe Switch multiple-pulse generative circuit using soft switch technique）And auxiliary circuit（Start-up circuit, protection circuit, reference circuits,

Chosen in the auxiliary circuits such as EMC circuits, AC rectification filter circuit according to the need for Switching Power Supply）；Characterized in that, the protection circuit of the auxiliary circuit at least includes current sampling circuit, primary or the inductance of primary or inductance or the power tube being sequentially connected or the upper limit current detection circuit of power tube and the adjustment circuit that adjustment or Indirect method error signal are performed according to the output signal of the detection circuit.The adjustment circuit can using trailing edge triggering with the preset d type flip flop of high level, the clock signal of the d type flip flop for the control circuit pulse modulated circuit according to the basic pulse of the error signal generation for carrying out self-feedback ciucuit（The unique power pipe or certain power tube that basic pulse has described translation circuit when being high level are opened）, the data port input low level of the d type flip flop, the preset input port input of the d type flip flop is the output signal for detecting circuit（High level is exported when detecting electric circuit inspection to super upper limit current）, open circuit output performs adjustment or Indirect method error signal during d type flip flop high level；Therefore, when detecting super upper limit current, the adjustment circuit adjusts error signal once, and adjustment amount is a fixed value.

Switching Power Supply of the present invention, its translation circuit uses monofocal translation circuit, and the power tube uses triode, the drive circuit at least two-way output signal, wherein it is connected all the way with the base stage of the triode, another road is connected with the emitter stage of the triode '；The base stage of the triode is connected by the resistance of a high value with high voltage power supply.The translation circuit is under the cooperation of corresponding circuit, the resistance and triode of high value can as the electrifying startup circuit of described auxiliary circuit a part, the pressure-resistant of triode is improved simultaneously, there will be further description with reference to accompanying drawing in the narration below.

Switching Power Supply of the present invention, using a piece of Switching Power Supply IC, the IC is at least integrated with member control circuit and part protection circuit.

A kind of digital processing high-quality active power factor correcting method proposed by the present invention, it is characterised in that：Using reference circuit and PFC reference signals, instead of the feedback circuit and error signal of known technology, described reference circuit at least includes voltage signal sampling circuit, voltage signal detection or the analog to digital conversion for the output circuit being sequentially connected（A/D) circuit, reference logic circuit and benchmark output circuit；Described reference logic circuit carries out numeral to the voltage signal after digitlization and patrolled Collect to handle and produce digitlization reference signal, and each end cycle point to reference signal in setting is adjusted, and holding reference signal is constant as far as possible within each cycle of setting；The described cycle is the integral multiple of civil power half period, the end point in each cycle and the edge synchronization of civil power half period（Need civil power synchronously input）；Or the described cycle is much larger than the half period of civil power（The internal clocking cycle can be used）；Or edge synchronization of the described cycle neither with the civil power half period is not much larger than the half period of civil power again, but require smaller to adjustment amount of reference signal（The internal clocking cycle can be used）, to meet the indices of IEC1000-3-2 and IEC1000-3-4 standards.

A kind of power factor correcting using the power factor correcting method proposed by the present invention, including：Translation circuit, including power tube, transformer or inductance, output circuit；Reference circuit；Circuit, including pulse modulated circuit and drive circuit are controlled, reference signal send pulse modulated circuit to control pulse generation；Auxiliary circuit, including ac rectifier, and in the auxiliary circuits such as start-up circuit, protection circuit, reference circuits, EMC circuits according to PFC devices the need for choose.

' power factor correcting of the present invention, it is characterised in that described pulse modulated circuit includes proportional current circuit, timing circuit, pulsewidth modulation logic circuit, current amplifier and oscillator, and its annexation is：The input of proportional current circuit is PFC reference signals, it is output as two-way proportional current and sends into the timing circuit, a pair of data signals of timing circuit give the pulsewidth modulation logic circuit, pulsewidth modulation logic circuit returns to a pair of data signals to the timing circuit, the output signal of current amplifier send timing circuit, oscillator output signal is to pulsewidth modulation logic circuit, finally by pulsewidth modulation logic circuit output pulse signal.Described pulse modulated circuit each several part will be further described in the narration below with reference to accompanying drawing.

Power factor correcting of the present invention, part reference circuit is at least integrated with using PFC IC, the IC；The IC is also integrated with member control circuit.

Environment protection switch power supply best-of-breed technology scheme of the present invention：Monolithic environment protection switch power supply IC is designed, and standby power uses single-ended flyback or single-ended hybrid, PWM mode, treats the anti-saturation design of drive circuit direct drive standby power pipe, antioverloading（Ensureing to reach peak value 5V 2.5A fan-out capabilities simultaneously, stand-by power consumption is smaller than 0.2W or lower during without standby output, and this is smaller than 0.5W or lower for stand-by power consumptions such as television sets, can support harsher green Power standard）；Main power source is shared PWM oscillators, main drive circuit direct drive main power tube, remote signal using single-ended flyback or single-ended hybrid, PWM mode, with standby power and controls the anti-saturation of main power source machine open/close, antioverloading to design with main error signal；PFC devices are designed using digital processing high-quality PFC.Beneficial effect：

Environment protection switch power supply is designed using monolithic environment protection switch power supply IC, circuit can not only be simplified, and can effectively reduce cost and improve quality；Using monolithic environment protection switch power supply thick film circuit or modular circuit, with dependable performance and it is easy to maintain the characteristics of；Master control circuit controls main power source machine open/close is sent with main error signal using remote signal, with more inexpensive, and has the effect of false action-proof；Using single-ended hybrid replacement single-ended forward type, the pressure-resistant of power tube is reduced, it is safer；Using the anti-saturation of antioverloading, digital processing high-quality PFC, with prominent technical advantage and high-quality；Above-mentioned technology is used for PC standards（Such as ATX, ATX12, SSI）Computer switching power supply, can effectively reduce cost and improve quality.It is described in detail：

Elaborated with reference to accompanying drawing of the present invention and non-limiting examples.

Fig. 1 is the anti-saturation of antioverloading, the non-limiting PWM Switching Power Supplies principle schematic of tape starting circuit.

Fig. 2 is the anti-saturation of another antioverloading, the non-limiting PWM Switching Power Supplies principle schematic of tape starting circuit.

Fig. 3 is preferred, the non-limiting PWM main power sources embodiment principle schematic of the anti-saturation of antioverloading. '

Fig. 4 is preferred, the non-limiting PFC principle schematics of digital processing high-quality.

Fig. 5 is another preferred, the non-limiting PFC principle schematics of digital processing high-quality.Fig. 6 is the non-limiting PFC principle schematics of preferred, simplified digital processing high-quality.

Fig. 7 is preferred non-limiting environment protection switch power supply embodiment schematic diagram.

Fig. 8 is preferred non-limiting environment protection switch power supply embodiment schematic diagram. Fig. 9 is preferred non-limiting environment protection switch power supply embodiment schematic diagram.

Figure 10 is non-limiting PC ATX standard greens Switching Power Supply application examples schematic diagram.

Figure 11 is another non-limiting PC ATX standard greens Switching Power Supply application examples schematic diagram.Figure 12 is preferably without the non-limiting PC ATX standard greens Switching Power Supply application examples schematic diagrames of PFC.

Figure 13 is single-ended mixed switch power source principle schematic diagram.

Figure 14 is single-ended mixed switch power source principle schematic diagram.

The magnitude of voltage and resistance value of above-mentioned all accompanying drawing marks are non-limiting values, can be set as other values according to design object and demand；Metal-oxide-semiconductor or triode can typically change driving and be exchanged with triode or metal-oxide-semiconductor.

Fig. 1 and Fig. 2, can be used as the Switching Power Supply independently used（Such as charger, environment protection switch power supply IC standby powers unit or Universal Switching Power Supply）, Q1 is preferred economical pliotron（Such as 13003, BUX87）；Qd is preferably molded-in power tube or external power tube；It is IC parts in dotted line frame, but Rb and Qa can be integrated in or beyond IC according to semiconductor technology and put, Rb can be also integrated in IC by the requirement optimization resistance of typically small power output, when need to such as be more than built-in power output can external parallel resistance meet requirement.Fig. 3 can as environment protection switch power supply IC main power source, be IC circuit parts in dotted line frame, high-power pipe Q2 can be external or is integrated in IC.La, lb current source.

SO, Schmidt's comparator, IC supply voltage monitoring circuits（Or a part for start-up circuit）, it is starting state if SO low levels, is normal condition if SO high level.Fig. 1, starting state, Qa shut-offs, PCL.QC high resistants（Or it is output-controlled）High-voltage high resistance value R1, which provides base stage micro-current, makes power tube Q1 be turned on smaller collector current, charged through diode Da to IC power capacitors CO, constitute start-up circuit, for Q1 startup safety, detectable charging current, control PCL.QC outputs, change Q1 base currents, it is safety value (such as 3mA to make Q1 electric currents）；Normal condition, PCL.QC, Qa are normal output, and R1 is ineffective；Accordingly, it is considered to Q1 amplification, compared with resistance current-limited startup circuit, what the start-up circuit was kept during normal condition is lost to when young an order of magnitude.Fig. 2, starting state, high-voltage current source is opened as electric capacity C0 chargings, composition PWMs start-up circuits；Normal condition, PWMs Recover normal condition, high-voltage current source is closed.Fig. 3, because main power source can share IC supply voltage monitoring circuits with standby power, therefore can make SO also have effect to PWM2（It is not drawn into figure）, starting state, PWM2 closings.

Fig. 1, during normal condition, PCL.QC is identical with PCL.Q outputs, such as output high level, Q1 and Qa conductings, Rb detection Q1 transient currents；As output switchs to low level by high level, Qa ends, but due to storage effect, Q1 will not end immediately, diode Da afterflows or design delay circuit make Qa delays Q1 emitter stages is clamped about 1 .5V to closing after Q1 cut-offs or Qa, and (this value can improve the pressure-resistant of Q1, IC is had relatively low power consumption again）, Q1 base voltages 0V is thus reverse-biased, therefore it is pressure-resistant to improve Q1 colelctor electrode.Fig. 2, during normal condition, PCLs.Q such as exports high level, Qd conductings, Rb detection Qd transient currents；Such as export low level, Qd cut-offs.Fig. 3, during normal condition, PCL2.Q such as exports high level, Q2 conductings, R2 detection Q2 transient currents；Such as export low level, Q2 cut-offs.

S2, PWM comparator（Or pwm circuit, it is illustrated that current-mode is used, voltage mode can be also used）Principle is, oscillator Q rising edge power tube is begun to turn on, transformer primary current increase, Rb or R2 pressure drop also increases, when the pressure drop is equal to or more than error signal (being reflected in the voltage UC1 or UC2 on C1 or C2), S2 output low levels, power tube is closed；But oscillator determines maximum duty cycle, and principle is that S2 still exports high level, and oscillator Q is changed into low level, then power tube is closed；S1, Schmidt's comparator（Or forbid circuit as main power source）, principle is that error signal is less than setting value（Threshold value）Then power tube PWM cycle positive closing, is opened as higher than power tube PWM cycle if setting value, therefore conversion efficiency when improving Switching Power Supply underloading.

S3, upper limit current comparator（Or upper limit current detection circuit）If primary or power tube reach upper limit current, and S3 is starting the anti-saturation control logic S5 (adjustment circuits of antioverloading）Simultaneously close off power tube（Optional, reason is to close power tube by S2 to be responsible for）.S5 has many solutions, it is considered herein that most easy scheme is, S5 is activated once, and S4 then turns on a cycle oscillator；But following condition must be met, S4 is in a PWM (or oscillators）Average current in cycle（Referred to as 14) be more than current source la (Fig. 1 and Fig. 2) or principal voltage feedback current subtracts current source lb (Fig. 3, difference is lc);14 and la or lc is in a PWM cycle UC1 or UC2 joint contributions can be selected within 2.8V* (- 10%), and maximum output current now should be more than 95%, such as la is 2.8V * 3.3% to UC1 contributions, then 14 be chosen as 3-4 times of la it is relatively good；Therefore, error signal is reduced（Force alignment error signal）, next or several PWM cycles, dutycycle diminishes, and the peak point current of primary or power tube will reduce；For the sufficient transformer of fast power pipe, capacity and the faster control circuit of response, during overload, error signal is near maximum；For slower power tube or the transformer of off-capacity（Once transformer saturation, its primary current rises rapidly, reach or more than upper limit current）Or the slower control circuit of response, in overload, error signal will be less than theoretical calculation maximum, control circuit by advanced switch-off power pipe；Although still having the super upper limit current of power tube or transformer saturation, the time is extremely short, it is ensured that the safety of power tube and transformer, improves reliability.

S5 another program is that S5 is activated once, I4=la (or lc) * 1.2_;Follow-up PWM cycles S5, then I4=la (or lc) * 0.8 stopped S5 as without being activated;The above-mentioned .2 of multiple 1 and 0.8 can be it is other be more than 1 and the value less than 1, it is contemplated that the transient response of Switching Power Supply；This scheme can further improve to power tube and tranformer protection, increase maximum output current.S5 can also use digital processing logic scheme, 14 during adaptive convergence overload.For the ease of monitoring in use, the best output overloading monitoring signals of S5（Principle is that S5 is activated once to produce and once exported, and can directly be indicated, is not drawn into figure by LED）.

Fig. 1, Fig. 2 and Fig. 3 use monofocal continuous current mode, then should be PCL, PCLs, PCL2 and S5 design delay circuit, prevent that opening spike makes power tube shut-off or S5 error startings by mistake.

The above-mentioned anti-saturation Switching Power Supply PWM control technologies of antioverloading are also applied for the structures such as push-pull type, semibridge system and full-bridge type, and such as addition anti-saturation protection circuit of antioverloading detects power tube or the super upper limit current of primary, then forces alignment error signal（S3, S5 such as are added for TL494, S5 forces 3 pin of adjustment or 4 pin level）So that in next or several PWM cycles, dutycycle diminishes, and the peak point current of power tube or primary will reduce, therefore protect power tube and transformer, improve the safety and reliability of Switching Power Supply.

The above-mentioned discussion to Fig. 1 can partly rephrase as follows：One kind is using single only economical switch work( Rate triode, the pwm control circuit suitable for monofocal（Or IC), there are two-way input and output to connect the base stage and emitter stage of power tube respectively, the base stage of power tube has high-voltage high resistance value resistance to connect the colelctor electrode of high-voltage power supply or power tube（High-voltage power supply is connect by primary）.During starting state, the high-impedance state all the way of base stage is connect（Or it is output-controlled）, high-voltage high resistance value resistance provide power tube base stage micro-current, power tube emitter stage low current by diode give IC power filtering capacitors charge（Or current-limiting charge）, complete to start.During normal condition, PWM positive periods, power tube base stage positively biased is made all the way, power tube emitter stage, power tube conducting are pulled down all the way；PWM negative cycles, power tube base stage is pulled down all the way, due to storage effect, power tube will not end immediately, can be to be closed when the afterflow of power tube emitter stage or the delay of drop-down emitter stage end to power tube or power tube emitter stage clamp by diode, but after power tube cut-off, its base stage is reverse-biased, therefore it is pressure-resistant to improve the colelctor electrode of power tube.

Fig. 4, Fig. 5, Fig. 6, can be as the PFC independently used, and interior dotted line frame is IC circuits.R3 detects PFC inductance Lp electric currents, PFC electric currents（That is Lp electric currents）Benchmark output filter capacitor Cir and high-power pipe Qp can be external or are integrated in IC.UD, commercial power rectification is synchronously inputted, RV, high-voltage high resistance current-limiting resistance.Rh, Rl, PFC output voltage signal sample circuits do not filter or filtered off greater than about thousands of Hz high-frequency noise；VA, voltage signal detection exports high pressure Vhh, high pressure Vh, low pressure VI, low pressure VII signals, or an A/D (analog using four voltage comparators）Converter.IR0, PFC current reference export accumulator（Electric capacity Cir voltages are converted to according to output is overflowed, benchmark is provided for PFC electric currents, is a kind of D/A (D/As）Conversion；But electric capacity Cir voltages multiply inverse ratio with IR1）；IR1, current PFC current references output register；IR2, PFC current reference output register；IR3, large period PFC average current benchmark output registers；II, current PFC current references output register（IR1) large period accumulator；CT, large period counter；IR0, IR1, IR2, IR3 are (according to accuracy requirement）It is preferred that 8 or 9, (large period should be greater than the civil power cycle to CT, can be chosen in relative broad range）It is preferred that 12, then II preferably 20 or 21.

Fig. 4, PFC current reference produce logic（That is digital processing element, IR Logic):It should be delayed after electrification reset some, PFC Logic put permission signal, complete PFC soft-start features, while putting the half that IR2 and IR3 is its maximum, II and CT reset；It is one big Cycle completes, and obtaining large period current reference output average value by II loads IR3, starts new large period；Voltage detecting 0000 (refer to Vhh=0, Vh=0, Vl=0, Vll=0, only 0000,0001,0011,0111,1,111 5 kind of state）, IR1 puts maximum（Stf), prevent PFC output voltages from falling too much；Voltage detecting 1111, IR1 is set to 0 (clO), and PFC Logic put disable signal, prevents PFC output voltages from exceeding the upper limit, after voltage detecting returns to 0011, PFC Logic put permission signal；Voltage detecting non-zero 000 or non-1111, and PFC Logic is allow, IR2 loads IR1;Voltage detecting 0000 to 0001 or 1111 to 0111, IR3 loads IR2, uses large period average current benchmark；Voltage detecting 0111 to 0011 is lowered to 0111, IR2 again, searches for actual IR2 values；Voltage detecting 0011 to 0001 is raised to 0011, IR2 again, searches for actual IR2 values；For relatively stable load, IR2 is lowered or raised, and is subtracted one or Jia one；, can be using an adjustment equivalent register, if IR2 is lowered or continuous up-regulation to be continuous for the load changed greatly, then adjustment equivalent register increase, otherwise adjusts equivalent register and reduces, therefore, IR2 is lowered or raised, and is that IR2 subtracts or adds adjustment equivalent register；Restriction can be taken to ensure that IR2 is more than designated value, PFC is operated in continuous current mode.

Fig. 5, PFC current reference produce logic（IR1 Logic):It is substantially similar to above-mentioned IR Logic principles, except that, IR2 change（Lower or up-regulation or loading）, it is synchronous with UD rising edge or trailing edge（Hereinafter referred to as UD is synchronous, i.e. the civil power half period is synchronous）；Voltage detecting 0000 to 0001 or 1111 to 0111, UD synchronizations IR3 loads IR2;Voltage detecting 0111, UD synchronizations IR2 is lowered；Voltage detecting 0001, UD synchronizations IR2 up-regulations；Voltage detecting 0011 is failure to actuate, therefore Vh, VI can merge into a signal, only 0000,0001,0111,1,111 4 kind of state, but nonjoinder IR2 will reduce and changes frequency；Therefore, PFC current references are constant within the half period of civil power.

Fig. 6, PFC current reference produce logic（IR2 Logic):It should be delayed after electrification reset some, putting PFC Logic allows signal, completes PFC soft-start features；Voltage detecting 1111, PFC Logic put disable signal；UD synchronizing voltages detection 0111, PFC current references put Ri1;UD synchronizing voltages detection 0011, PFC Logic put permission signal, and PFC current references put Ri2;UD synchronizing voltages detection 0001, PFC current references put Ri3;UD is same Voltage detecting 0000 is walked, PFC current references put Ri4;Ri1, Ri2, Ri3, Ri4 current reference（Ascending arrangement, scheme 1: 25%, 50%, 75%, 100%；Scheme 2: 40%, 60%, 80%, 100%；Different schemes, VA need to be adjusted accordingly）, can be considered that D/A is converted, therefore, may be designed as 4 D/A conversion, IR2 Logic are then designed as more complicated logic, calculate more accurate PFC current references according to voltage detecting, but should ensure that the change of PFC current references is synchronous with UD.

Above-mentioned Fig. 4, Fig. 5, Fig. 6 PFC current references produce logic unit, can directly substitute UC3854 (or similar IC) error amplifier, constitute new safer, more reliable, high-quality continuous current mode control IC;Or UC3852 (or similar IC) error amplifier is directly substituted, constitute new safer, more reliable, high-quality discontinuous current mode constant turn-on time control IC.

Fig. 4, Fig. 5, Fig. 6 PFC can be average-current modes, and being operated in CCM or DCM, (but to DCM, R3 detection PFC electric currents send -4 amplifiers after must filtering）；- 4 be PFC current amplifiers, and timing circuit is sent in the output of PFC current amplifiers；Imk is proportional current circuit, is made up of three triodes or metal-oxide-semiconductor, a current reference input, two proportional current outputs；Timing circuit, by two ratio electric capacity（To be put in or beyond 30PF and 15PF, IC in figure, hereinafter referred to as Ct2 and Ct1), two triodes or metal-oxide-semiconductor that are discharged for ratio electric capacity（Ta, Tb), two monitoring ratio capacitance voltage amplifier（Aa, Ab) constitute, a pair of data signals inputs control Ta, Tb ON/OFF respectively, and Aa, Ab export a pair of data signals；PFC benchmark output circuit by Cir, Ri (or directly）Output current benchmark, it is that two Capacity Ratios are 2 to produce equal current stabilization by Imk:1 capacity current charging；PFC Logic (pulsewidth modulation logic circuits）Principle is：Worked with oscillator synchronization, but allowed signal to control by PFC Logic；Oscillator rising edge, PFC enters the shut-off cycle, i.e. PFC power tubes Qp is closed, PFC inductance Lp electric currents decline, and Ct2 discharge tubes Ta is closed and current stabilization charging, and Ct1 discharge tubes Tb is kept it turned on and Ct1 voltages remain 0;When the electric current represented by Ct2 voltage is equal to PFC inductive currents, i.e. comparator Aa rising edges, Ct1 discharge tubes Tb is closed and current stabilization charging；When Ct1 voltages catch up with Ct2 voltage, i.e. comparator Ab rising edges are opened the cycle into PFC, and PFC power tubes Qp is opened, the increase of PFC inductance Lp electric currents, Ct2 discharge tubes Ta and Ct1 Discharge tube Tb is opened, Ct2 and Ct1 are discharged as 0 voltage, is terminated until next oscillator rising edge, is started the new PFC cycles；It can prove, this control principle is in the case where continuous current mode and R3 detections are without filtering, and PFC is preferable average-current mode, and Lp electric currents are average current in Aa rising edges.

VA voltage signals shown in Fig. 4, Fig. 5, Fig. 6 is detected, can also use the detection output signal not for four, or A/D converter（Such as one bit A/D）Output voltage values, it can therefore be understood that VA is finally produced as D/A converters for A/D conversion, PFC current references（Or benchmark output circuit）, but PFC current references produce logic（Or reference logic circuit）Following principles should be met：VA inputs do not filter or filtered off high-frequency noise；Vhh logics are preferably formed with, when PFC is in Vhh=1, PFC forbids, and prevents PFC output voltages from exceeding the upper limit；VII logics are preferably formed with, when PFC is in Vll=0, PFC puts larger or maximum current benchmark, prevent PFC output voltages from falling too much, for the ease of the monitoring during use, preferably exported VII and monitor signal（Principle is to be not drawn into Vll=0 in output monitoring signal, figure）；Although Vhh and VII are optional, there are Vhh and VII PFC will be safer more reasonable；When non-Vhh=1 or non-Vll=0, PFC is keeping PFC current references constant compared with large period, i.e. start compared with large period or at the end of adjust primary current benchmark, and, edge synchronization compared with large period preferably with the half period integral multiple of civil power, or it is smaller much larger than the half period of civil power, or the adjustment of PFC current references；A/D and PFC current references are inputted according to VA and produce the complexity that D/A is converted, logic can be produced using more accurate PFC current references.Therefore, the current reference of above-mentioned PFC technologies produces logic can the IC implementations of digital processing capabilities with single-chip microcomputer etc..

Therefore, digital processing PFC control circuit of the present invention, with preferable power factor (PF)（It can be equal to 1), and preferably total harmonic distortion（It can be equal to 0), be the PFC control circuit of high-quality.

The environment protection switch power supply that Fig. 7, Fig. 8, Fig. 9 are designed using the anti-saturation of antioverloading, digital processing high-quality PFC, monolithic environment protection switch power supply IC is designed, standby error amplifier, main error amplifier use TL431, there are standby isolation circuit and main isolation circuit,-Pm remote signals send main control circuit with main error signal, remote control circuit uses triode for the working power of switch directly control primary feedback circuit, (is needed for three sections of preferred environment protection switch power supply IC in its dotted line frame Quote circuit in Fig. 1 to Fig. 6 dotted line frames）, for the ease of monitoring in use, preferably output standby power overload monitoring signal, main power source overload monitor signal, PFC VII monitoring signals or merge into a monitoring signal respectively（It is not drawn into figure）；Such as it is not required to include PFC, then constitutes the other two preferred environment protection switch power supply IC without PFC functions.Above-mentioned IC, main power source, standby power and PFC devices can share the oscillator of same fully integrated or external timing element, and each required changeable frequency is exchanged for.

A kind of PC standards that Figure 10, Figure 11, Figure 12 are designed using the anti-saturation of antioverloading, digital processing high-quality PFC（Such as ATX, ATX12, SSI）Green computer Switching Power Supply, monolithic environment protection switch power supply IC is designed, standby error amplifier, main error amplifier use TL431, there are standby isolation circuit and main isolation circuit,-PS-on remote signals send main control circuit with main error signal, and remote control circuit uses triode for the working power of switch directly control primary feedback circuit；Standby power uses monofocal；Main power source is using single-ended hybrid, and exciting current is released by diode Dfb and gives main output 5V (or 12V or 3.3V or combinations thereof）.

It is single-ended hybrid, wherein Uo2 power outputs should be greater than Uo1 shown in Figure 13 and 14.

Claims

Claims

1st, a kind of environment protection switch power supply containing idle function, at least including standby power, main power source；The standby power, at least including standby translation circuit, standby feedback circuit, readiness control circuit；The main power source, at least including primary transform circuit, primary feedback circuit, main control circuit；Standby power direct-flow input end, readiness control circuit, main power source direct-flow input end, main control circuit are altogether；It is characterized in that：1) environment protection switch power supply i c of the Qin Caiyong monolithics containing idle function, at least integrated readiness control circuit, main control circuit and auxiliary circuit, the startup of the IC is completed by unique electrifying startup circuit, working power is provided for the IC by standby power；Books or, using environment protection switch power supply thick film circuit of the monolithic containing idle function, at least include readiness control circuit, main control circuit, the startup of the thick film circuit is completed by unique electrifying startup circuit, working power is provided for the thick film circuit by standby power；The Qin or, using environment protection switch power supply modular circuit of the monolithic containing idle function, at least include standby feedback circuit, readiness control circuit, primary feedback circuit, main control circuit, the startup of the modular circuit is completed by unique electrifying startup circuit, working power is provided for the modular circuit by standby power；2) the primary feedback circuit, including main sample circuit, main error amplifier, main isolation circuit, remote control circuit；The main control circuit at least forbids circuit including main pulse modulation circuit, main drive circuit and main power source；Why not send master control circuit controls main power source machine open/close using remote signal isolation, in primary feedback circuit, the voltage signal of the main main output of sampling circuit samples, send main error amplifier, export main error signal through main isolation circuit, remote signal isolation is sent main control circuit by remote control circuit, in main control circuit, main power source forbids circuit to force main drive circuit output low level to turn off main power tube if remote signal is closes, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported；▲ or use remote signal to send master control circuit controls main power source machine open/close with main error signal, in primary feedback circuit, remote control circuit forces main error signal to be less than threshold value if when remote signal is closes, and remote signal for open when then remote control circuit it is ineffective, the voltage signal of the main main output of sampling circuit samples, send main error amplifier, produce key light Coupling electric current exports main error signal through main isolation circuit, in main control circuit, main power source forbids the main error signal of circuit monitors, it is that pass and main power source forbid circuit to force main drive circuit output low level that remote signal is thought if main error signal is less than threshold value, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported.

2nd, a kind of environment protection switch power supply IC as claimed in claim 1 containing idle function, it is characterised in that the IC is at least integrated with readiness control circuit, main control circuit and auxiliary circuit；1) readiness control circuit at least includes standby pulse modulated circuit and treats drive circuit, and standby pulse modulated circuit produces standby pulse according to standby error signal；2) main control circuit at least forbids circuit including main pulse modulation circuit, main drive circuit and main power source；Attack send main power source to forbid circuit using remote signal, and main power source forbids circuit to force main drive circuit output low level if remote signal is closes, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported；Books send main control circuit using remote signal with main error signal, main power source forbids the main error signal of circuit monitors, it is that pass and main power source forbid circuit to force main drive circuit output low level that remote signal is thought if main error signal is less than threshold value, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported；3) auxiliary circuit, at least including reference voltage source, start-up circuit, biasing circuit.

3rd, the environment protection switch power supply IC containing idle function as described in claim 2, it is characterised in that the standby pulse modulated circuit and the main pulse modulation circuit use pwm circuit, identical working frequency and shared oscillator.

4th, the environment protection switch power supply IC containing idle function as described in claim 2, it is characterised in that the IC is also integrated with PFC error amplifiers and PFC control circuit；The PFC control circuit, at least including PFC pulse modulated circuits and PFC drive circuits.

5th, a kind of main power source IC, it is characterised in that at least integrated main pulse modulation circuits of the IC, main drive circuit and main power source forbid circuit；Remote signal gives the IC with main error signal;Main power source forbids the main error signal of circuit monitors, and such as main error signal is less than threshold value It is that pass and main power source forbid circuit to force main drive circuit output low level then to think remote signal, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported.

6th, a kind of environment protection switch power supply thick film circuit as claimed in claim 1 containing idle function, it is characterised in that the thick film circuit at least includes readiness control circuit, main control circuit；Wherein, the main control circuit at least forbids circuit including main pulse modulation circuit, main drive circuit and main power source；Qin Caiyong remote signals send main power source to forbid circuit, and main power source forbids circuit to force main drive circuit output low level if remote signal is closes, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported；Father-in-law send main control circuit using remote signal with main error signal, main power source forbids the main error signal of circuit monitors, it is that pass and main power source forbid circuit to force main drive circuit output low level that remote signal is thought if main error signal is less than threshold value, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported.

7th, a kind of environment protection switch power supply modular circuit as claimed in claim 1 containing idle function, it is characterised in that the modular circuit at least includes readiness control circuit, standby feedback circuit, main control circuit, primary feedback circuit；Wherein, the primary feedback circuit, including main sample circuit, main error amplifier, main isolation circuit, remote control circuit；The main control circuit at least forbids circuit including main pulse modulation circuit, main drive circuit and main power source；▲ send master control circuit controls main power source machine open/close using remote signal isolation, in primary feedback circuit, the voltage signal of the main main output of sampling circuit samples, send main error amplifier, export main error signal through main isolation circuit, remote signal isolation is sent main control circuits by remote control circuit, in main control circuit, main power source forbids circuit to force main drive circuit output low level to turn off main power tube if remote signal is closes, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported；▲ or use remote signal to send master control circuit controls main power source machine open/close with main error signal, in primary feedback circuit, remote control circuit forces main error signal to be less than threshold value if when remote signal is closes, and remote signal is that then remote control circuit is ineffective when opening, and main sample circuit is adopted The voltage signal of the main output of sample, main error amplifier, generation key light coupling electric current is sent to export main error signal through main isolation circuit, in main control circuit, main power source forbids the main error signal of circuit monitors, it is that pass and main power source forbid circuit to force main drive circuit output low level that remote signal is thought if main error signal is less than threshold value, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported.

8th, a kind of environment protection switch power supply containing idle function, at least include standby power, main power source and auxiliary circuit, wherein main power source at least includes primary transform circuit, primary feedback circuit and main control circuit, and main control circuit and main power source direct-flow input end are altogether；Characterized in that, there is a remote signal to send main control circuit remote-controlled mains power machine open/close with main error signal；Standby power is at least main power source start and provides working power；The primary feedback circuit, including main sample circuit, main error amplifier, main isolation circuit, remote control circuit, remote control circuit forces main error signal to be less than threshold value if when remote signal is closes, and remote signal is then remote control circuit is ineffective when opening, the voltage signal of the main main output of sampling circuit samples, main error amplifier, generation key light coupling electric current is sent to export main error signal through main isolation circuit；The main control circuit, at least forbid circuit including main pulse modulation circuit, main drive circuit and main power source, main power source forbids the main error signal of circuit monitors, it is that pass and main power source forbid circuit to force main drive circuit output low level that remote signal is thought if main error signal is less than threshold value, and otherwise main pulse modulation circuit produces main pulse, main drive circuit according to main error signal and normally exported.

9th, a kind of environment protection switch power supply containing idle function as claimed in claim 8, it is characterized in that, the primary feedback circuit, when the voltage signal of main output is more than setting value, key light coupling no current, main error signal are minimum, and otherwise the more big then key light coupling electric current of the voltage signal error of main output is bigger, main error signal is also bigger；The main control circuit, main error signal is inputted using resistance or constant-current source drop-down.

10th, a kind of monofocal Switching Power Supply translation circuit, it is characterised in that be at least all the way single-ended forward type output and be at least all the way single-ended flyback output, arbitrarily all the way single-ended forward type output can with certain all the way single-ended flyback output go the same way. 11st, the green computer Switching Power Supply such as a kind of PC ATX standards, it is characterised in that using the environment protection switch power supply containing idle function as described in claim 1,8 or 9；Wherein, the standby translation circuit uses monofocal translation circuit；The primary transform circuit uses single-ended hybrid or single-ended forward type translation circuit.

12nd, a kind of method for preventing switch power supply current overload and saturation, it is characterised in that comprise the following steps-detect primary or inductance or whether power tube current exceedes upper limit current；If more than upper limit current, producing the adjustment of adjustment signal or Indirect method error signal so that within next or several impulse modulation cycles, dutycycle diminishes.

13rd, a kind of Switching Power Supply using method as claimed in claim 12, including：Translation circuit, feedback circuit, control circuit and auxiliary circuit；Characterized in that, the protection circuit of the auxiliary circuit at least includes current sampling circuit, primary or the inductance of primary or inductance or the power tube being sequentially connected or the upper limit current detection circuit of power tube, performs adjustment or Indirect method error signal according to the output signal of the detection circuit

14th, a kind of Switching Power Supply IC using method as claimed in claim 12, it is characterised in that be at least integrated with control circuit and protection circuit；The protection circuit at least includes the upper limit current detection circuit for primary or inductance or the power tube being sequentially connected, the adjustment circuit of adjustment or Indirect method error signal is performed according to the output signal of the detection circuit.

15th, Switching Power Supply IC as claimed in claim 14, it is characterized in that, the control circuit includes pwm circuit, oscillator and drive circuit, drive circuit is sent in pwm circuit output pulse, drive circuit has two-way output, the wherein base stage of driving power triode, the emitter stage of another road driving power triode all the way.

16th, a kind of digital processing high-quality active power factor correcting method, its feature exists In：PFC reference signals are adjusted in each end cycle point of setting；The described cycle is the integral multiple of civil power half period, the end point in each cycle and the edge synchronization of civil power half period；Or the described cycle is much larger than the half period of civil power；Or edge synchronization of the described cycle neither with the civil power half period is not much larger than the half period of civil power again, but adjustment amount of reference signal is smaller, to meet the indices of IEC1000-3-2 and IEC1000-3-4 standards.

17th, a kind of power factor correcting using method as claimed in claim 16, including：Translation circuit, reference circuit, control circuit and auxiliary circuit；Characterized in that, described reference circuit at least includes voltage signal sampling circuit, voltage signal detection or A/D circuits, reference logic circuit and the benchmark output circuit for the output circuit being sequentially connected；Described reference signal send control circuit evolving pulse.

18th, a kind of PFC IC using such as claim 16 methods described, it is characterized in that, part reference circuit is at least integrated with, described reference circuit at least includes the voltage signal detection being sequentially connected or A/D circuits, reference logic circuit and benchmark output circuit；Described reference signal send control circuit evolving pulse.

19th, PFC IC as claimed in claim 18, it is characterized in that, also it is integrated with the pulse modulated circuit of control circuit, the pulse modulated circuit includes proportional current circuit, timing circuit, pulsewidth modulation logic circuit, current amplifier and oscillator, and its annexation is：The input of proportional current circuit is PFC reference signals, it is output as two-way proportional current and sends into the timing circuit, a pair of data signals of timing circuit give the pulsewidth modulation logic circuit, pulsewidth modulation logic circuit returns to a pair of data signals to the timing circuit, the output signal of current amplifier send timing circuit, oscillator output signal is to pulsewidth modulation logic circuit, finally by pulsewidth modulation logic circuit output pulse signal.