CN102983750A - Switching power-conversion circuit and applicable power supply unit of same - Google Patents

Abstract

The invention discloses a switching power-conversion circuit and an applicable power supply unit of the same. The switching power-conversion circuit is used for receiving electricity energy of input voltages to generate output voltages to a system circuit and comprises a power circuit, a feedback circuit and a control unit. The power circuit is provided with a first switching circuit and generates output voltages and first boosting voltages through the connection or disconnection of the first switching circuit respectively; the feedback circuit is used for generating feedback signals according to the output voltages; and the control unit is connected with the first switching circuit and the feedback circuit and controls the first switching circuit to stop operation or operate at intervals when the power state of the system circuit is off, so that the normal output voltages and the first auxiliary voltages are lower than nominal voltages or are zero voltages.

Description

Exchange type power conversion circuit and the power supply unit that is suitable for thereof

The present invention is one and divides an application that the applying date of original application is on July 23rd, 2009, and application number is 200910160470.3, and denomination of invention is: exchange type power conversion circuit and the power supply unit that is suitable for thereof.

Technical field

The present invention relates to a kind of power-switching circuit, the power supply unit that relates in particular to a kind of exchange type power conversion circuit and be suitable for.

Background technology

In recent years along with the progress of science and technology, electronic product with difference in functionality of all kinds is developed gradually, these electronic products with difference in functionality of all kinds have not only satisfied people's various different demands, more incorporate everyone daily life, so that people's life is more convenient.

The electronic product of these difference in functionalitys of all kinds is comprised of various electronic component, and the required supply voltage of each electronic component is not quite similar, and therefore, the AC power that electric power system now provides also is not suitable for directly offering the electronic product use.In order to provide suitable voltage to make its normal operation to each electronic component, these electronic products need to be by power-switching circuit with AC power, and for example general civil power is converted to suitable voltage and uses to each electronic component.

Power-switching circuit is according to the difference of its circuit structure, can divide into roughly two kinds of linear formula and exchange type power conversion circuits approximately, simple linear formula power-switching circuit is comprised of transformer, diode rectifier and capacitive filter, its advantage is that circuit is simple and cost is low, but because using larger transformer and conversion efficiency low, so can't use in small volume or the long-time electronic product that uses.Compared to linear formula power-switching circuit, exchange type power conversion circuit has higher conversion efficiency and less volume, and therefore, the electronic product of use or miniaturization can use exchange type power conversion circuit mostly for a long time.

Although, exchange type power conversion circuit has higher conversion efficiency, still, no matter whether traditional exchange type power conversion circuit needs to provide electric energy to load or electronic product, this exchange type power conversion circuit is continuous service always still, makes output voltage keep load voltage value.Therefore, even exchange type power conversion circuit does not provide electric energy to load or electronic product, this exchange type power conversion circuit still can continuous service and is consumed electric energy, causes exchange type power conversion circuit to have higher power consumption when electric energy is not provided to load or electronic product.

From the above, when the tradition exchange type power conversion circuit does not use the electric energy that this exchange type power conversion circuit provides in load or electronic product, when for example load or electronic product are out of service, the tradition exchange type power conversion circuit still can continuous service, cause integrated circuit to have higher power consumption, do not meet the energy saving characteristic.If when using the power supply unit of traditional exchange type power conversion circuit that electric energy is provided to electronic product, even if the user does not use electronic product, power supply unit still can continuous service and is consumed unnecessary electric energy.

Therefore, how to develop a kind of exchange type power conversion circuit that improves above-mentioned known technology defective, be in fact the present problem in the urgent need to address in this area.

Summary of the invention

The object of the present invention is to provide a kind of exchange type power conversion circuit, when not needing to provide electric energy to load or electronic product, when for example load or electronic product were out of service, integrated circuit had lower power consumption, to meet the energy saving characteristic.This exchange type power conversion circuit is used in power supply unit and provides electric energy to electronic product, can when the user does not use electronic product, make power supply unit have lower power consumption.

For reaching above-mentioned purpose, of the present invention one than the broad sense execution mode for a kind of exchange type power conversion circuit is provided, produce output voltage to circuit system in order to the electric energy that receives input voltage, exchange type power conversion circuit comprises: power circuit, it comprises the first switching circuit, in order to the electric energy that receives input voltage and by the first switching circuit conducting or cut-off and produce respectively output voltage and the first boost voltage in the first power output end and second source output; Feedback circuit is connected in power circuit, produces feedback signal in order to power state signal and output voltage according to circuit system; Control circuit is connected in the first switching circuit and feedback circuit, in order to control the first switching circuit conducting or cut-off according to feedback signal, makes the energy of this power circuit reception input voltage and is converted to output voltage and the first boost voltage; And start-up circuit, be connected in circuit system and control circuit, in order to will produce starting resistor to control circuit according to power state signal; Wherein, when power state signal was closed condition, the ratio value of feedback signal and output voltage was the first feedback proportional value, and made the first boost voltage be lower than the working voltage value, and then made control circuit out of service.

For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of exchange type power conversion circuit is provided, produce output voltage in order to the electric energy that receives input voltage, and output voltage is sent to the circuit system of electronic product via the out-put supply connector, exchange type power conversion circuit comprises: power circuit, it comprises the first switching circuit, in order to the electric energy that receives input voltage and by the first switching circuit conducting or cut-off and produce respectively output voltage and the first boost voltage in the first power output end and second source output; Feedback circuit is connected in power circuit, in order to produce feedback signal according to output voltage; And the power state detection circuit, be connected in the first power output end of power circuit, whether need exchange type power conversion circuit that electric energy is provided in order to the detection system circuit, and produce corresponding power state detection signal; Control circuit, be connected in the first switching circuit, feedback circuit and power state detection circuit, control the first switching circuit conducting or cut-off in order to produce pulse width modulation control signal according to power state detection signal and feedback signal, make power circuit receive the energy of this input voltage and be converted to output voltage and the first boost voltage; Wherein, when the power state detection signal was closed condition, control circuit was controlled the out of service or intermittent operation of the first switching circuit, made the magnitude of voltage normality of output voltage and the first boost voltage be lower than load voltage value or be zero voltage value.

For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of exchange type power conversion circuit is provided, produce output voltage to circuit system in order to the electric energy that receives input voltage, exchange type power conversion circuit comprises: power circuit, it comprises the first switching circuit, in order to the electric energy that receives input voltage and by the first switching circuit conducting or cut-off and produce respectively output voltage and the first boost voltage in the first power output end and second source output; Feedback circuit is connected in power circuit, in order to produce feedback signal according to output voltage; And control unit, be connected in the first switching circuit and feedback circuit, control the first switching circuit conducting or cut-off in order to closed condition and running status according to feedback signal and circuit system, make the energy of power circuit reception input voltage and be converted to output voltage and the first boost voltage; Wherein, when the power supply status of circuit system was closed condition, control unit was controlled the out of service or intermittent operation of the first switching circuit, made the magnitude of voltage normality of output voltage and the first boost voltage be lower than load voltage value or be zero voltage value.

For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of power supply unit is provided, it comprises exchange type power conversion circuit, produce output voltage in order to the electric energy that receives input voltage, and output voltage is sent to the circuit system of electronic product via the out-put supply connector, exchange type power conversion circuit comprises: a power circuit, it comprises the first switching circuit, in order to the electric energy that receives input voltage and by the first switching circuit conducting or cut-off and produce respectively output voltage and the first boost voltage in the first power output end and second source output; Feedback circuit is connected in power circuit, in order to produce feedback signal according to output voltage; And control unit, be connected in the first switching circuit, circuit system and feedback circuit, control the first switching circuit conducting or cut-off in order to closed condition and running status according to feedback signal and circuit system, make the energy of power circuit reception input voltage and be converted to output voltage and the first boost voltage; Wherein, when the power supply status of circuit system was closed condition, this control unit was controlled the out of service or intermittent operation of the first switching circuit, made the magnitude of voltage normality of output voltage and the first boost voltage be lower than load voltage value or be zero voltage value.

Exchange type power conversion circuit of the present invention, when the circuit system that do not need to provide electric energy to load or electronic product, when for example load or electronic product are out of service, can make the control circuit of control unit out of service by the start-up circuit of feedback circuit and control unit, and then make exchange type power conversion circuit out of service.More can utilize the power state detection circuit of control unit according to the power state detection signal of the power supply status generation of electronic product, the control circuit of control unit is intermittently moved, so that the magnitude of voltage of the output voltage of exchange type power conversion circuit does not continue to maintain load voltage value, or it is zero voltage value.Therefore, integrated circuit has lower power consumption, and input voltage need not be adjusted into zero voltage value or interruption, and exchange type power conversion circuit of the present invention will be out of service, to meet the energy saving characteristic.In addition, exchange type power conversion circuit of the present invention can be applicable to power supply unit and the circuit system of electric energy to electronic product is provided, and can be when the user use electronic product, make power supply unit out of service, therefore will do not removed and interrupting input voltage by socket by power supply unit, get final product so that power supply unit is out of service, and have lower power consumption.

Description of drawings

Fig. 1: be the circuit block diagram of the exchange type power conversion circuit of preferred embodiment of the present invention.

Fig. 2: be the signal sequence schematic diagram of preferred embodiment of the present invention.

Fig. 3: be the detailed circuit schematic of the exchange type power conversion circuit of preferred embodiment of the present invention.

Fig. 4: be the circuit block diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Fig. 5: be the detailed circuit schematic of the exchange type power conversion circuit of the another preferred embodiment of the present invention.

Fig. 6 A: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Fig. 6 B: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Fig. 7: be the signal sequence schematic diagram of Fig. 6 A of the present invention and Fig. 6 B.

Fig. 8 A: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Fig. 8 B: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Fig. 9 A: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Fig. 9 B: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Figure 10: be the signal sequence schematic diagram of Fig. 9 A of the present invention and Fig. 9 B.

Figure 11 A: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Figure 11 B: be the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.

Figure 12: be the detailed circuit schematic of the feedback circuit of another preferred embodiment of the present invention.

Description of reference numerals in the above-mentioned accompanying drawing is as follows:

1: exchange type power conversion circuit 2: circuit system

11: power circuit 11a: the first power output end

11b: 111: the first switching circuits of second source output

113: the second current rectifying and wave filtering circuits of 112: the first current rectifying and wave filtering circuits

114: current detection circuit 12a, 12b: feedback circuit

121: three adjustable voltage stabilizing element 121a of end: anode tap

121r: reference edge 121c: cathode terminal

122: the first isolated component 13a, 13b, 13c: control unit

13a1,13b1,13c1: control circuit 13a2: start-up circuit

13b2,13c2,13d2,13e2: power state detection circuit

13a3: 131: the second isolated components of accelerating circuit

133: the first coupled switchs of 132: the three isolated components

134: holding circuit 14: input rectification circuit

1a: out-put supply connector

Q ₁~ Q ₄: the first switch element ~ the 4th switch element

Q _1a~ Q _4a: first end Q _1b~ Q _4b: the second end

COM1: the first common end COM2: second holds jointly

T _r: transformer N _p: armature winding

N _s: secondary winding N _a: auxiliary winding

R ₁~ R ₁₅: the first resistance ~ the 15 resistance I ₁: the first electric current

I ₂: the second electric current R _s: detect resistance

C _In: input capacitance C _T: Detection capacitance

C ₁~ C ₅: the first electric capacity ~ the 5th electric capacity D ₁: the first diode

D ₂: the second diode D ₃: the 3rd diode

K ₁: the first link K ₂: the second link

V _o: output voltage V _Cc: the first boost voltage

V _H: starting resistor V _Fb: feedback signal

V _St: power state signal V ₁: the first voltage division signal

V _PWM: pulse width modulation control signal V _1a: the first critical voltage value

V _2b: the second critical voltage value V _a: the power state detection signal

Embodiment

Some exemplary embodiments that embody feature ﹠ benefits of the present invention will be described in detail in the explanation of back segment.Be understood that the present invention can have in different modes various variations, its neither departing from the scope of the present invention, and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to limit the present invention.

See also Fig. 1, it is the circuit block diagram of the exchange type power conversion circuit of preferred embodiment of the present invention.As shown in Figure 1, exchange type power conversion circuit 1 of the present invention is in order to receive input voltage V _InElectric energy and produce specified output voltage V _o, this exchange type power conversion circuit 1 comprises: power circuit 11, feedback circuit 12a and control unit 13a in the present embodiment, comprise control circuit 13a1 and start-up circuit 13a2.Wherein, power circuit 11 comprises the first switching circuit 111, in order to receive input voltage V _InElectric energy and by 111 conductings of the first switching circuit or cut-off and produce respectively output voltage V in the first power output end 11a and second source output 11b _oWith the first boost voltage V _CcFeedback circuit 12a is connected in the first power output end 11a and the control circuit 13a1 of power circuit 11, the power state signal V that provides in order to the circuit system 2 according to electronic product _StWith output voltage V _oProduce feedback signal V _FbControl circuit 13a1 is connected in the control end of the first switching circuit 111 and the output of feedback circuit 12a, in order to according to feedback signal V _FbProduce pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, with input voltage V _InPower conversion be output voltage V _oWith the first boost voltage V _CcStart-up circuit 13a2 is connected in the power input, circuit system 2 and control circuit 13a1 of power circuit 11, in order to according to power state signal V _StUse input voltage V _InElectric energy produce starting resistor V _HAnd be sent to control circuit 13a1 control circuit 13a1 is brought into operation.

See also Fig. 2 and cooperate Fig. 1, Fig. 2 is the signal sequence schematic diagram of preferred embodiment of the present invention.As shown in Figure 1, in very first time t ₁Before, power state signal V _StBe the running status of high potential, expression circuit system 2 needs exchange type power conversion circuit 1 that electric energy is provided.At this moment, feedback circuit 12a is according to output voltage V _oThe corresponding feedback signal V that produces _FbWith output voltage V _oRatio value can make control circuit 13a1 according to feedback signal V _FbThe output voltage V of control power circuit 11 outputs _oWith the first boost voltage V _CcMaintain load voltage value, to provide respectively electric energy to circuit system 2 and control circuit 13a1.Because, the first boost voltage V to control circuit 13a1 is provided _CcMagnitude of voltage greater than the required working voltage value V of the normal operation of control circuit 13a1 _On, therefore, control circuit 13a1 understands continuous service and produces pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, with input voltage V _InPower conversion be output voltage V _oWith the first boost voltage V _Cc

In very first time t ₁The time, power state signal V _StChange the closed condition of zero potential or electronegative potential into by the running status of high potential, expression circuit system 2 does not need exchange type power conversion circuit 1 that electric energy is provided.At this moment, feedback circuit 12a is according to output voltage V _oThe corresponding feedback signal V that produces _FbWith output voltage V _oRatio value can make control circuit 13a1 according to feedback signal V _FbThe first boost voltage V of control power circuit 11 outputs _CcBe lower than working voltage value V _On, and then make control circuit 13a1 out of service, continuing makes output voltage V _oWith the first boost voltage V _CcBe zero voltage value.Because this moment, start-up circuit 13a2 can basis be the power state signal V of closed condition _StMake starting resistor V _HMagnitude of voltage be zero voltage value, even therefore input voltage V _InCan continue to provide electric energy to start-up circuit 13a2, start-up circuit 13a2 can not use input voltage V yet _InElectric energy produce the starting resistor V of non-zero voltage value _HStart control circuit 13a1.Therefore, in very first time t ₁To the second time t ₂Between, control circuit 13a1 can be out of service, output voltage V _oWith the first boost voltage V _CcBe zero voltage value, exchange type power conversion circuit 1 stops to provide electric energy to circuit system 2.

In the second time t ₂The time, power state signal V _StChange the running status of high potential into by the closed condition of zero potential or electronegative potential, at this moment, start-up circuit 13a2 can be according to being the power state signal V of running status _StMake input voltage V _InElectric energy be sent to control circuit 13a1, also be starting resistor V _HBe the non-zero voltage value, again via control circuit 13a1 with starting resistor V _HElectric energy be sent to the electric capacity (not shown) of power circuit 11 inside, make the first boost voltage V _CcMagnitude of voltage rise to working voltage value V _OnMore than, and start control circuit 13a1 operation, and after control circuit 13a1 starts operation, can begin to produce pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off.At this moment, power state signal V _StBe the running status of high potential, feedback circuit 12a is according to output voltage V _oThe corresponding feedback signal V that produces _FbWith output voltage V _oRatio value can make control circuit 13a1 according to feedback signal V _FbThe output voltage V of control power circuit 11 outputs _oWith the first boost voltage V _CcMaintain load voltage value, to provide respectively electric energy to circuit system 2 and control circuit 13a1.

Because power circuit 11, feedback circuit 12a, control circuit 13a1 and start-up circuit 13a2 kind are numerous, below will exemplify explanation.See also Fig. 3, it is the detailed circuit schematic of the exchange type power conversion circuit of preferred embodiment of the present invention.As shown in Figure 3, power circuit 11 comprises the first switching circuit 111, the first current rectifying and wave filtering circuit 112, the second current rectifying and wave filtering circuit 113 and transformer T _r, in the present embodiment, transformer T _rComprise armature winding N _p(primary winding), secondary winding N _s(secondarywinding) with auxiliary winding N _a(auxiliary winding), and the first switching circuit 111 is by the first switch element Q ₁Realize.Wherein, transformer T _rArmature winding N _pAn end be connected in the first switch element Q ₁First end Q _1a, and the first switch element Q ₁The second end Q _1bBe connected to the first common end COM1 and control circuit 13a1 with control end, by the pulse width modulation control signal V of control circuit 13a1 generation _PWMMake the first switch element Q ₁Conducting or cut-off, and then with input voltage V _InElectric energy via transformer T _rArmature winding N _pBe sent to secondary winding N _sWith auxiliary winding N _a, more respectively by the first current rectifying and wave filtering circuit 112 and the second current rectifying and wave filtering circuit 113 rectifying and wave-filterings to produce output voltage V _oWith the first boost voltage V _Cc

The first current rectifying and wave filtering circuit 112 is connected in transformer T _rSecondary winding N _sAnd between the circuit system 2 of electronic product, and comprise the first diode D ₁With the first capacitor C ₁The first diode D ₁Anode tap and transformer T _rSecondary winding N _sConnect the first diode D ₁Cathode terminal be connected in circuit system 2 and the first capacitor C ₁An end, the first capacitor C ₁Be connected between the first power output end 11a and the second common end COM2 of power circuit 11.The second current rectifying and wave filtering circuit 113 is connected in transformer T _rAuxiliary winding Na and control circuit 13a1 between, and comprise the second diode D ₂With the second capacitor C ₂The second diode D ₂Anode tap and transformer T _rAuxiliary winding N _aConnect the second diode D ₂Cathode terminal be connected in control circuit 13a1 and the second capacitor C ₂An end, the second capacitor C ₂Be connected between the second source output 11b and the first common end COM1 of power circuit 11.

In the present embodiment, feedback circuit 12a comprises the first resistance R ₁, the second resistance R ₂, the 3rd resistance R ₃, the 4th resistance R ₄, second switch element Q ₂, the first isolated component 122 and the adjustable voltage stabilizing element 121 of three ends (3-Terminal Adjustable Regulator), wherein, the first resistance R ₁Be connected in the first power output end 11a and the first link K of power circuit 11 ₁Between, the second resistance R ₂Be connected in the first link K ₁And between the second common end COM2, and the first resistance R ₁With the second resistance R ₂Consist of the first bleeder circuit, in order to output voltage V _oIn the reference edge 121r dividing potential drop of the adjustable voltage stabilizing element 121 of three ends and produce the first voltage division signal V ₁

The first isolated component 122 can be but not be defined as optical coupling isolated component (photoelectriccoupling isolation), the outlet side of this first isolated component 122 is connected in control circuit 13a1, can be according to the first electric current I that flows into the first isolated component 122 input sides ₁Size of current produce corresponding feedback signal V _FbThe input side of the first isolated component 122 and the 4th resistance R ₄Be connected in series between the first power output end 11a of the cathode terminal 121c (cathode) of the adjustable voltage stabilizing element 121 of three ends and power circuit 11, flow into the cathode terminal 121c of the adjustable voltage stabilizing element 121 of three ends or the first electric current I of the first isolated component 122 input sides in order to restriction ₁Size of current, the 4th resistance R ₄Just can reach restriction the first electric current I with the input side of the first isolated component 122 for being connected in series ₁The effect of size of current.In some embodiment, the 4th resistance R ₄The priority position that is connected in series with the input side of the first isolated component 122 can exchange, with opposite (not shown) shown in Figure 3.

Voltage stabilizing element 121 optional usefulness that three ends are adjustable for example National Semiconductor (NationalSemiconductor) model are the IC realization of LM317, but not as limit.The anode tap 121a (Anode) of three ends are adjustable voltage stabilizing element 121 and reference edge 121r are connected to the second common end COM2 and the first link K ₁, in order to according to the first voltage division signal V ₁With the first reference voltage in the adjustable voltage stabilizing element 121 of three ends, for example 1.25 volts (V), automatically the corresponding size of current of adjusting the first electric current I 1 makes the outlet side of the first isolated component 122 according to output voltage V _oVariation produce feedback signal V _FbThe 3rd resistance R ₃With second switch element Q ₂Be connected in series in the second resistance R ₂Between the two ends, and second switch element Q ₂Control end be connected in circuit system 2, and in power state signal V _StFor the running status of high potential makes second switch element Q ₂During conducting, the 3rd resistance R ₃Meeting and the second resistance R ₂Be connected in parallel, in the present embodiment, the 3rd resistance R ₃An end be connected in second switch element Q ₂First end Q _2a, the 3rd resistance R ₃The other end be connected in the first link K ₁, second switch element Q ₂The second end Q _2bBe connected in the second common end COM2.

In the present embodiment, start-up circuit 13a2 comprises the 7th resistance R ₇, the 8th resistance R ₈, the 9th resistance R ₉, the second isolated component 131 and the 3rd switch element Q ₃, wherein, the 7th resistance R ₇Be connected in power input and the second link K of power circuit 11 ₂Between, the 8th resistance R ₈Be connected in the second link K ₂And between the first common end COM1, wherein, the 7th resistance R ₇With the 8th resistance R ₈Can consist of the second bleeder circuit, in order to utilize input voltage V _InElectric energy produce the second voltage division signal V at the second link K2 ₂The 3rd switch element Q ₃First end Q _3aWith the second end Q _3bBe connected to power input and the control circuit 13a1 of power circuit 11, the outlet side of the second isolated component 131 is connected in the 3rd switch element Q ₃Control end and the second link K ₂Between, the input side of the second isolated component 131 and the 9th resistance R ₉Be connected in series between circuit system 2 and the second common end COM2.Similarly, the second isolated component 131 can be but not be defined as the optical coupling isolated component.

As power state signal V _StDuring for the running status of high potential, the second voltage division signal V ₂Can be sent to the 3rd switch element Q via the outlet side of the second isolated component 131 ₃Control end, make input voltage V _InElectric energy be sent to control circuit 13a1, at this moment, starting resistor V _HElectric energy can be sent to via control circuit 13a1 the second capacitor C of power circuit 11 inside ₂, make the first boost voltage V _CcMagnitude of voltage rise to working voltage value V _OnMore than, and start control circuit 13a1 operation.On the contrary, as power state signal V _StDuring for the closed condition of zero potential or electronegative potential, the second voltage division signal V ₂Then can't be sent to via the outlet side of the second isolated component 131 the 3rd switch element Q ₃Control end, at this moment, starting resistor V _HBe zero voltage value, starting resistor V _HCan't start control circuit 13a1 operation.

As for feedback circuit 12a, as power state signal V _StDuring for the closed condition of zero potential or electronegative potential, second switch element Q ₂Cut-off, the 3rd resistance R ₃Not can with the second resistance R ₂Be connected in parallel, at this moment, feedback signal V _FbWith output voltage V _oRatio be the first feedback proportional value, the first voltage division signal V ₁With output voltage V _oRatio be the first dividing potential drop ratio value A ₁, the first voltage division signal V ₁With output voltage V _oRelational expression (formula 1) be:

${\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HDA00002457784400161.png"\; state="\{\{state\}\}">V</figure-callout>}}_1=\frac{R_2}{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA00002457784400161.png"\; state="\{\{state\}\}">R</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002457784400011.png,HDA00002457784400031.png"\; state="\{\{state\}\}">R</figure-callout>}}_2}\&CenterDot;V_o=A_1\&CenterDot;V_o.$

As power state signal V _StDuring for the running status of high potential, the running status of high potential can make second switch element Q ₂Conducting, the 3rd resistance R ₃With the second resistance R ₂Be connected in parallel, at this moment, feedback signal V _FbWith output voltage V _oRatio be the second feedback proportional value, the first voltage division signal V ₁With output voltage V _oRatio be the second dividing potential drop ratio value A ₂, the first voltage division signal V ₁With output voltage V _oRelational expression (formula 2) be:

${\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HDA00002457784400161.png"\; state="\{\{state\}\}">V</figure-callout>}}_1=\frac{({\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002457784400011.png,HDA00002457784400031.png"\; state="\{\{state\}\}">R</figure-callout>}}_2//R_3)}{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA00002457784400161.png"\; state="\{\{state\}\}">R</figure-callout>}}_1+({\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002457784400011.png,HDA00002457784400031.png"\; state="\{\{state\}\}">R</figure-callout>}}_2//R_3)}\&CenterDot;V_o=A_2\&CenterDot;V_o.$

From the above, the first dividing potential drop ratio value A ₁Greater than the second dividing potential drop ratio value A ₂So the first feedback proportional value is greater than the second feedback proportional value.In other words, as power state signal V _StDuring for the running status of high potential, feedback signal V _FbWith output voltage V _oRatio be that the second feedback proportional value can make control circuit 13a1 according to feedback signal V _FbThe output voltage V of control power circuit 11 outputs _oWith the first boost voltage V _CcMaintain load voltage value.As power state signal V _StWhen changing the closed condition of zero potential or electronegative potential into, feedback signal V _FbWith output voltage V _oRatio be that the first feedback proportional value can make control circuit 13a1 according to feedback signal V _FbThe first boost voltage V of control power circuit 11 outputs _CcBe lower than load voltage value and working voltage value V _On, and then make control circuit 13a1 out of service.

Fig. 4 is the circuit block diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.Such as Fig. 1 and shown in Figure 4, in this embodiment, exchange type power conversion circuit 1 is similar to principle to structure shown in Figure 1, repeats no more in this.Exchange type power conversion circuit 1 shown in Figure 4 is that with structure difference shown in Figure 1 the exchange type power conversion circuit 1 of Fig. 4 also comprises: input rectification circuit 14 and input capacitance C _In, wherein, input rectification circuit 14 is connected in the power input of power circuit 11, in order to the input voltage V to alternating current _InRectification, and input capacitance C _InThen be connected between the power input and the first common end COM1 of power circuit 11.

Fig. 5 is the detailed circuit schematic of the exchange type power conversion circuit of the another preferred embodiment of the present invention.Such as Fig. 3 and shown in Figure 5, in this embodiment, exchange type power conversion circuit 1 is similar to principle to structure shown in Figure 3, repeats no more in this.Difference is that exchange type power conversion circuit shown in Figure 51 also comprises: current detection circuit 114, input rectification circuit 14, accelerating circuit 13a3, input capacitance C _In, the 5th resistance R ₅, the 6th resistance R ₆, the tenth resistance R ₁₀, the 11 resistance R ₁₁, the 3rd capacitor C ₃And the 4th capacitor C ₄In present embodiment, current detection circuit 114 inclusion test resistance R _s, be connected in the first switch element Q ₁The second end Q _1bAnd between the first common end COM1, be used to the first switch element Q ₁Detect during conducting and flow through the first switch element Q ₁Size of current, and produce corresponding current detection signal V _IsTo control circuit 13a1.Input rectification circuit 14 is connected in the power input of power circuit 11, in order to the input voltage V to alternating current _InRectification, and input capacitance C _InThen be connected between the power input and the first common end COM1 of power circuit 11.

The control unit 13a of Fig. 5 (not label) also comprises accelerating circuit 13a3 and the 11 resistance R except comprising control circuit 13a1 and start-up circuit 13a2 ₁₁, wherein, accelerating circuit 13a3 is connected in the first switch element Q ₁Control end and control circuit 13a1 between, in order to accelerate the first switch element Q ₁Operation.In the present embodiment, accelerating circuit 13a3 comprises the 4th switch element Q ₄, the 12 resistance R ₁₂, the 13 resistance R ₁₃And the 14 resistance R ₁₄, wherein, the 4th switch element Q ₄First end Q _4aBe connected in the first switch element Q ₁Control end, the 12 resistance R ₁₂Be connected in the first switch element Q ₁Control end and control circuit 13a1 between, the 13 resistance R ₁₃Be connected in the 4th switch element Q ₄Control end and first end Q _4aBetween, the 14 resistance R ₁₄Be connected in the 4th switch element Q ₄The second end Q _4bAnd between the first common end COM1.In pulse width modulation control signal V _PWMWhen changing zero potential or low-potential state into by high potential state, discharge path can be via the 4th switch element Q of conducting ₄With the 14 resistance R ₁₄, and accelerate the velocity of discharge.

In the present embodiment, feedback circuit 12a also comprises the 5th resistance R ₅, the 6th resistance R ₆, the 3rd capacitor C ₃And the 4th capacitor C ₄, wherein, the 5th resistance R ₅Be connected in second switch element Q ₂Control end and circuit system 2 between, the 6th resistance R ₆Be connected in second switch element Q ₂Control end and the second common end COM2 between, and the 5th resistance R ₅With the 6th resistance R ₆Consist of the input bleeder circuit, in order to power state signal V _StAt second switch element Q ₂The control end dividing potential drop.The 3rd capacitor C ₃Be connected in second switch element Q ₂Control end and the second common end COM2 between, in order to eliminate noise.The 4th capacitor C ₄Be connected between the reference edge 121r and cathode terminal 121c of the adjustable voltage stabilizing element 121 of three ends, in order to compensate the operation characteristic of the adjustable voltage stabilizing element 121 of three ends.

In the present embodiment, start-up circuit 13a2 also comprises the tenth resistance R ₁₀Be connected in the 3rd switch element Q ₃The second end Q _3bAnd between the control end, in order to prevent because of the 3rd switch element Q ₃Control end noise is arranged and makes the 3rd switch element Q ₃The mistake start.Similarly, the 11 resistance R ₁₁Be connected in the first switch element Q ₁Control end and the first common end COM1 between, in order to prevent because of the first switch element Q ₁Control end noise is arranged and makes the first switch element Q ₁The mistake start.

See also Fig. 6 A and cooperate Fig. 1, Fig. 6 A is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.As shown in Figure 6A, control unit 13b and the feedback circuit 12b of the exchange type power conversion circuit 1 of Fig. 6 A are different from Fig. 1, and exchange type power conversion circuit 1 is connected with the circuit system 2 of electronic product by out-put supply connector 1a, and wherein, feedback circuit 12b is only according to output voltage V _oProduce feedback signal V _FbSo, feedback signal V _FbWith output voltage V _oRatio value for fixing, can be according to power state signal V _StAnd change.

In the present embodiment, control unit 13b comprises control circuit 13b1 and power state detection circuit 13b2, wherein, power state detection circuit 13b2 is connected in the first power output end 11a, control circuit 13b1 and the out-put supply connector 1a of power circuit 11, whether need exchange type power conversion circuit 1 that electric energy is provided in order to detection system circuit 2, and produce corresponding power state detection signal V _aControl unit 13b then is connected in control end and the feedback circuit 12b of power circuit 11, the first switching circuit 111, in order to according to power state detection signal V _aWith feedback signal V _FbProduce pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, with input voltage V _InPower conversion be output voltage V _oWith the first boost voltage V _Cc

In the present embodiment, power state detection circuit 13b2 comprises the 3rd isolated component and the 15 resistance R ₁₅, wherein the outlet side of the 3rd isolated component 132 is connected in control circuit 13b1, and the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Be connected in series input side and the 15 resistance R of the 3rd isolated component 132 after being connected in series ₁₅An end be connected in the first power output end 11a of power circuit 11, the other end then is connected with the circuit system 2 of electronic product by out-put supply connector 1a.

In the present embodiment, when the user is connected out-put supply connector 1a with the circuit system 2 of electronic product, the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Can by circuit system 2 inner formation loops, make the second electric current I of the input side that flows into the 3rd isolated component 132 ₂Non-vanishing current value, correspondence make power state detection signal V _aRunning status for zero potential or electronegative potential.On the contrary, when the user separates out-put supply connector 1a with the circuit system 2 of electronic product, the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Just can't be by circuit system 2 inner formation loops, at this moment the second electric current I ₂Be zero current value, correspondence makes power state detection signal V _aClosed condition for high potential.

See also Fig. 6 B and cooperate Fig. 6 A, Fig. 6 B is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.Fig. 6 B and Fig. 6 A difference are that the power state detection circuit 13c2 of Fig. 6 B also comprises the first coupled switch 133, in order to according to the annexation of out-put supply connector 1a and circuit system 2 and conducting or cut-off.In the present embodiment, the input side of the 3rd isolated component 132, the 15 resistance R ₁₅Be connected in series input side, the 15 resistance R of the 3rd isolated component 132 after being connected in series with the first coupled switch 133 ₁₅Be connected in the first power output end 11a of power circuit 11 with an end of the first coupled switch 133, the other end then is connected in the second common end COM2.

Similarly, when the user is connected out-put supply connector 1a with the circuit system 2 of electronic product, the corresponding conducting of the first coupled switch 133 meetings, the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Can consist of the loop by the first coupled switch 133, make the second electric current I of the input side that flows into the 3rd isolated component 132 ₂Non-vanishing current value, correspondence make power state detection signal V _aRunning status for zero potential or electronegative potential.On the contrary, when the user separated out-put supply connector 1a with the circuit system 2 of electronic product, the first coupled switch 133 can correspondingly end the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Just can't consist of the loop, at this moment the second electric current I ₂Be zero current value, correspondence makes power state detection signal V _aClosed condition for high potential.

See also Fig. 7 and cooperate Fig. 6 A and Fig. 6 B, Fig. 7 is the signal sequence schematic diagram of Fig. 6 A of the present invention and Fig. 6 B.As shown in Figure 7, in the 3rd time t ₃Before, out-put supply connector 1a is connected with the circuit system 2 of electronic product, flows into the second electric current I of the input side of the 3rd isolated component 132 ₂Non-vanishing current value, correspondence make power state detection signal V _aRunning status for zero potential or electronegative potential.At this moment, the power state detection signal V of running status _aCan make control circuit 13b1 according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, with output voltage V _oWith the first boost voltage V _CcMaintain load voltage value.

In the 3rd time t3, out-put supply connector 1a separates the second electric current I with the circuit system 2 of electronic product ₂Can change into zero current value, correspondence makes power state detection signal V _aChange into the closed condition of high potential.At this moment, the power state detection signal V of closed condition _aControl circuit 13b1 is stopped according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off.In like manner, in the 3rd time t ₃To the 6th time t ₆Between, power state detection signal V _aBe closed condition, control circuit 13b1 can stop according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, correspondence makes output voltage V _oWith the first boost voltage V _CcCan't maintain load voltage value.

In the 3rd time t ₃To the 4th time t ₄Between, control circuit 13b1 can stop to produce pulse width modulation control signal V _PWMTo the first switching circuit 111, correspondence makes output voltage V _oThe magnitude of voltage continuous decrease be lower than load voltage value, still, control circuit 13b1 can be intermittently directly with input voltage V _InElectric energy be sent to the second source output 11b of power circuit 11 via control circuit 13b1 so that the first boost voltage V _CcMagnitude of voltage can change up and down.In power state detection signal V _aThe 4th time t for closed condition ₄With the 5th time t ₅, control circuit 13b1 can produce pulse width modulation control signal V momently _PWMControl the first switching circuit 111 and move momently, correspondence makes output voltage V _oWith the first boost voltage V _CcRise to momently load voltage value.

In the 6th time t ₆, exchange type power conversion circuit 1 is connected with the circuit system 2 of electronic product by out-put supply connector 1a, flows into the second electric current I of the input side of the 3rd isolated component 132 ₂Change into the non-zero current value, correspondence makes power state detection signal V _aChange into running status.At this moment, the power state detection signal V of running status _aCan make control circuit 13b1 according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, with output voltage V _oWith the first boost voltage V _CcMaintain load voltage value.

In the 3rd time t ₃To the 6th time t ₆Between, do not need exchange type power conversion circuit 1 to provide load voltage value to circuit system 2, control circuit 13b1 can stop according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, the output voltage V of exchange type power conversion circuit 1 _oWith the first boost voltage V _CcCan not maintain load voltage value, correspondence makes exchange type power conversion circuit 1 of the present invention than the operation of power saving ground.In the present embodiment, at power state detection signal V _aThe 3rd time t for closed condition ₃To the 6th time t ₆Between, power state detection signal V _aMagnitude of voltage can keep fixed voltage value and can not change up and down.In certain embodiments, at power state detection signal V _aThe 3rd time t for closed condition ₃To the 6th time t ₆Between, power state detection signal V _aMagnitude of voltage can change up and down (not shown), but power state detection signal V _aMagnitude of voltage can be greater than the first critical voltage value (not shown), control circuit 13b1 still can judge power state detection signal V _aClosed condition for high potential.

See also Fig. 8 A and cooperate Fig. 6 A, Fig. 8 A is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.Circuit structure shown in the exchange type power conversion circuit 1 of Fig. 8 A and Fig. 6 A is similar to principle, repeats no more in this.Exchange type power conversion circuit 1 shown in Fig. 8 A is that with circuit structure difference shown in Fig. 6 A the exchange type power conversion circuit 1 of Fig. 8 A also comprises: input rectification circuit 14 and input capacitance C _In, wherein, input rectification circuit 14 is connected in the power input of power circuit 11, in order to the input voltage V to alternating current _InRectification, and input capacitance C _InThen be connected between the power input and the first common end COM1 of power circuit 11.

See also Fig. 8 B and cooperate Fig. 6 B, Fig. 8 B is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.Circuit structure shown in the exchange type power conversion circuit 1 of Fig. 8 B and Fig. 6 B is similar to principle, repeats no more in this.Exchange type power conversion circuit 1 shown in Fig. 8 B is that with circuit structure difference shown in Fig. 6 B the exchange type power conversion circuit 1 of Fig. 8 B also comprises: input rectification circuit 14 and input capacitance C _In, wherein, input rectification circuit 14 is connected in the power input of power circuit 11, in order to the input voltage V to alternating current _InRectification, and input capacitance C _InThen be connected between the power input and the first common end COM1 of power circuit 11.

See also Fig. 9 A and cooperate Fig. 6 A, Fig. 9 A is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.The control unit 13c of the exchange type power conversion circuit 1 of Fig. 9 A is different from Fig. 6 A, in Fig. 9 A, control unit 13c also comprises holding circuit 134, and be connected in the first power output end 11a, second common end COM2 and the power state detection circuit 13d2 of power circuit 11, produce the second boost voltage V in order to the electric energy that receives power circuit 11 outputs _bProvide to power state detection circuit 13d2.

In the present embodiment, holding circuit 134 comprises the 3rd diode D ₃With the 5th capacitor C ₅, wherein, the 5th capacitor C ₅An end and the second common end COM2 be connected the 5th capacitor C ₅The other end and the 3rd diode D ₃Cathode terminal connect and the 3rd diode D ₃Anode tap be connected with the first power output end 11a of power circuit 11.The power output end of holding circuit 134 is the 3rd diode D ₃Cathode terminal, be connected in power state detection circuit 13d2.Power state detection circuit 13d2 is except comprising the 3rd isolated component and the 15 resistance R ₁₅Go back the inclusion test capacitor C outward, _TBe connected between control circuit 13c1 and the first common end COM1.Similarly, the outlet side of the 3rd isolated component 132 is connected in control circuit 13c1, and the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Be connected in series input side and the 15 resistance R of the 3rd isolated component 132 after being connected in series ₁₅An end be connected in the power output end of holding circuit 134, the other end then is connected with the circuit system 2 of electronic product by out-put supply connector 1a.

Similarly, when the user is connected out-put supply connector 1a with the circuit system 2 of electronic product, the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Can by circuit system 2 inner formation loops, make the second electric current I of the input side that flows into the 3rd isolated component 132 ₂Non-vanishing current value, correspondence make power state detection signal V _aRunning status for zero potential or electronegative potential.On the contrary, when the user separates out-put supply connector 1a with the circuit system 2 of electronic product, the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Just can't be by circuit system 2 inner formation loops, at this moment the second electric current I ₂Be zero current value, correspondence makes power state detection signal V _aClosed condition for high potential.

See also Fig. 9 B and cooperate Fig. 9 A, Fig. 9 B is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.Fig. 9 B and Fig. 9 A difference are that the power state detection circuit 13e2 of Fig. 9 B also comprises the first coupled switch 133, in order to according to the annexation of out-put supply connector 1a and circuit system 2 and conducting or cut-off.In the present embodiment, the input side of the 3rd isolated component 132, the 15 resistance R ₁₅Be connected in series input side, the 15 resistance R of the 3rd isolated component 132 after being connected in series with the first coupled switch 133 ₁₅Be connected in the power output end of holding circuit 134 with an end of the first coupled switch 133, the other end then is connected in the second common end COM2.

Similarly, when the user is connected out-put supply connector 1a with the circuit system 2 of electronic product, the corresponding conducting of the first coupled switch 133 meetings, the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Can consist of the loop by the first coupled switch 133, make the second electric current I of the input side that flows into the 3rd isolated component 132 ₂Non-vanishing current value, correspondence make power state detection signal V _aRunning status for zero potential or electronegative potential.On the contrary, when the user separated out-put supply connector 1a with the circuit system 2 of electronic product, the first coupled switch 133 can correspondingly end the input side of the 3rd isolated component 132 and the 15 resistance R ₁₅Just can't consist of the loop, at this moment the second electric current I ₂Be zero current value, correspondence makes power state detection signal V _aClosed condition for high potential.

Please consult Figure 10 again and cooperate Fig. 9 A and Fig. 9 B, Figure 10 is the signal sequence schematic diagram of Fig. 9 A of the present invention and Fig. 9 B.As shown in figure 10, in the 7th time t ₇Before, out-put supply connector 1a is connected with the circuit system 2 of electronic product, flows into the second electric current I of the input side of the 3rd isolated component 132 ₂Non-vanishing current value, correspondence make power state detection signal V _aRunning status for zero potential or electronegative potential.At this moment, the power state detection signal V of running status _aCan make control circuit 13c1 according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, with output voltage V _o, the first boost voltage V _CcAnd the second boost voltage V _bMaintain load voltage value.

In the 7th time t ₇, out-put supply connector 1a separates the second electric current I with the circuit system 2 of electronic product ₂Can change into zero current value, correspondence makes power state detection signal V _aChange into the closed condition of high potential.At this moment, the power state detection signal V of closed condition _aControl circuit 13c1 is stopped according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off.In like manner, in the 7th time t ₇Between the tenth time t10, power state detection signal V _aBe closed condition, control circuit 13c1 can stop according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, correspondence makes output voltage V _oWith the first boost voltage V _CcCan't maintain load voltage value.

In the present embodiment, in the 7th time t ₇To the tenth time t ₁₀Between, power state detection signal V _aBe the closed condition of non-zero voltage value, control circuit 13c1 can be intermittently directly with input voltage V _InElectric energy be sent to Detection capacitance C via control circuit 13c1 _T, make power state detection signal V _aMagnitude of voltage greater than the first critical voltage value V _1aAlthough, Detection capacitance C _TWhen charge and discharge, can make power state detection signal V _aMagnitude of voltage change up and down, still, power state detection signal V _aMagnitude of voltage still can be greater than the first critical voltage value V _1a, control circuit 13c1 can judge power state detection signal V _aClosed condition for high potential.

In the 7th time t ₇To the 8th time t ₈Between, control circuit 13c1 can stop to produce pulse width modulation control signal V _PWMTo the first switching circuit 111, correspondence makes output voltage V _oThe magnitude of voltage continuous decrease be lower than load voltage value, still, holding circuit 134 can continue the second boost voltage V _bMagnitude of voltage keep greater than the second critical voltage value V _2bMore than.When out-put supply connector 1a was connected with the circuit system 2 of electronic product, holding circuit 134 can provide the second boost voltage V of enough magnitudes of voltage _bTo power state detection circuit 13d2,13e2 makes power state detection signal V _aCorrespondence is changed into the running status of zero potential or electronegative potential.

In order to make the second boost voltage V _bMagnitude of voltage keep greater than the second critical voltage value V _2bMore than, in power state detection signal V _aThe 8th time t for closed condition ₈With the 9th time t ₉, control circuit 13c1 can produce pulse width modulation control signal V momently _PWMControl the first switching circuit 111 and move momently, correspondence makes output voltage V _o, the first boost voltage V _CcAnd the first boost voltage V _CcRise to momently load voltage value, and to the 5th capacitor C of holding circuit 134 ₅So electric energy supplement is the second boost voltage V _bMagnitude of voltage can keep greater than the second critical voltage value V _2bMore than.Because the 7th time t ₇, the 8th time t ₈, the 9th time t ₉And the tenth time t ₁₀Between time difference longer, therefore, output voltage V _oWith the first boost voltage V _CcThe magnitude of voltage normality can drop to zero voltage value.

In the tenth time t ₁₀, exchange type power conversion circuit 1 is connected with the circuit system 2 of electronic product by out-put supply connector 1a, flows into the second electric current I of the input side of the 3rd isolated component 132 ₂Change into the non-zero current value, correspondence makes power state detection signal V _aChange into running status.At this moment, the power state detection signal V of running status _aCan make control circuit 13b1 according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, with output voltage V _o, the first boost voltage V _CcAnd the second boost voltage V _bMaintain load voltage value.

In the 7th time t ₇To the tenth time t ₁₀Between, do not need exchange type power conversion circuit 1 to provide load voltage value to circuit system 2, control circuit 13c1 can stop according to feedback signal V _FbProduce constantly pulse width modulation control signal V _PWMControl 111 conductings of the first switching circuit or cut-off, the output voltage V of exchange type power conversion circuit 1 _oWith the first boost voltage V _CcNormality can drop to zero voltage value, and correspondence makes exchange type power conversion circuit 1 of the present invention than the operation of power saving ground.

See also Figure 11 A and cooperate Fig. 9 A, Figure 11 A is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.Circuit structure shown in the exchange type power conversion circuit 1 of Figure 11 A and Fig. 9 A is similar to principle, repeats no more in this.Exchange type power conversion circuit 1 shown in Figure 11 A is that with circuit structure difference shown in Fig. 9 A the exchange type power conversion circuit 1 of Figure 11 A also comprises: input rectification circuit 14 and input capacitance C _In, wherein, input rectification circuit 14 is connected in the power input of power circuit 11, in order to the input voltage V to alternating current _InRectification, and input capacitance C _InThen be connected between the power input and the first common end COM1 of power circuit 11.

See also Figure 11 B and cooperate Fig. 9 B, Figure 11 B is the local circuit schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.Circuit structure shown in the exchange type power conversion circuit 1 of Figure 11 B and Fig. 9 B is similar to principle, repeats no more in this.Exchange type power conversion circuit 1 shown in Figure 11 B is that with circuit structure difference shown in Fig. 9 B the exchange type power conversion circuit 1 of Figure 11 B also comprises: input rectification circuit 14 and input capacitance C _In, wherein, input rectification circuit 14 is connected in the power input of power circuit 11, in order to the input voltage V to alternating current _InRectification, and input capacitance C _InThen be connected between the power input and the first common end COM1 of power circuit 11.

See also Figure 12 and cooperate Fig. 3, Figure 12 is the detailed circuit schematic of the feedback circuit of another preferred embodiment of the present invention.The feedback circuit 12b of Figure 12 is similar to the feedback circuit 12a of Fig. 3, and difference is that the feedback circuit 12b of Figure 12 does not comprise the 3rd resistance R ₃With second switch element Q ₂, the annexation of other elements is same as the feedback circuit 12a of Fig. 3, does not repeat them here.

Control circuit 13a1 of the present invention, 13b1,13c1 can be but not be defined as Pwm controller (pulse width modulation controller, PWM controller), pulse frequency modulated controller (pulse frequency modulation controller, PFM controller) or digital signal processor (digital signal processor, DSP).Switch element of the present invention can be but not be defined as bipolar junction transistor (Bipolar Junction Transistor, BJT) or mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET).

In sum, exchange type power conversion circuit of the present invention, when the circuit system that do not need to provide electric energy to load or electronic product, when for example load or electronic product are out of service, can make the control circuit of control unit out of service by the start-up circuit of feedback circuit and control unit, and then make exchange type power conversion circuit out of service.More can utilize the power state detection circuit of control unit according to the power state detection signal of the power supply status generation of electronic product, the control circuit of control unit is intermittently moved, so that the magnitude of voltage of the output voltage of exchange type power conversion circuit does not continue to maintain load voltage value, or it is zero voltage value.Therefore, integrated circuit has lower power consumption, and input voltage vin need not be adjusted into zero voltage value or interruption, and exchange type power conversion circuit of the present invention will be out of service, to meet the energy saving characteristic.In addition, exchange type power conversion circuit of the present invention can be applicable to power supply unit and the circuit system of electric energy to electronic product is provided, and can when the user does not use electronic product, make power supply unit out of service, therefore will do not removed and interrupting input voltage V by socket by power supply unit _In, get final product so that power supply unit is out of service, and have lower power consumption.

The present invention must be appointed by those of ordinary skills and executes that the craftsman thinks and be to modify as all, right neither scope of taking off such as the wish protection of attached claim institute.

Claims (39)

1. an exchange type power conversion circuit produces an output voltage in order to the electric energy that receives an input voltage, and this output voltage is sent to a circuit system of an electronic product via an out-put supply connector, and this exchange type power conversion circuit comprises:

One power circuit, it comprises one first switching circuit, in order to the electric energy that receives this input voltage and by this first switching circuit conducting or cut-off and produce respectively this output voltage and one first boost voltage in one first power output end and a second source output;

One feedback circuit is connected in this power circuit, in order to produce a feedback signal according to this output voltage; And

Whether one power state detection circuit is connected in this first power output end of this power circuit, need this exchange type power conversion circuit that electric energy is provided in order to detect this circuit system, and produces a corresponding power state detection signal;

One control circuit, be connected in this first switching circuit, this feedback circuit and this power state detection circuit, control this conducting of the first switching circuit or cut-off in order to produce a pulse width modulation control signal according to this power state detection signal and this feedback signal, make this power circuit receive the energy of this input voltage and be converted to this output voltage and this first boost voltage;

Wherein, when this power state detection signal was a closed condition, this control circuit was controlled the out of service or intermittent operation of this first switching circuit, made the magnitude of voltage normality of this output voltage and this first boost voltage be lower than load voltage value or be zero voltage value.

2. exchange type power conversion circuit as claimed in claim 1, wherein when this out-put supply connector was connected with this circuit system, this power state detection signal was a running status; When this out-put supply connector separated with this circuit system, this power state detection signal was this closed condition.

3. exchange type power conversion circuit as claimed in claim 2, wherein when this power state detection signal is this closed condition, this control circuit stops to produce constantly this pulse width modulation control signal according to this feedback signal and controls this conducting of the first switching circuit or cut-off, makes this output voltage and this first boost voltage not maintain load voltage value.

4. exchange type power conversion circuit as claimed in claim 2, wherein when this power state detection signal is this closed condition, this control circuit produces momently this pulse width modulation control signal and controls this first switching circuit and move momently, and correspondence makes this output voltage and this first boost voltage rise to momently load voltage value.

5. exchange type power conversion circuit as claimed in claim 2, wherein when this power state detection signal is this closed condition, this control circuit intermittently directly is sent to this second source output of this power circuit with the electric energy of this input voltage via this control circuit, and the magnitude of voltage of this first boost voltage is changed up and down.

6. exchange type power conversion circuit as claimed in claim 2, wherein when this power state detection signal was this closed condition, the magnitude of voltage normality of this output voltage and this first boost voltage was zero voltage value.

7. exchange type power conversion circuit as claimed in claim 2, also comprise and keep circuit, be connected between this first power output end and this power state detection circuit of this power circuit, producing one second boost voltage in order to the electric energy that receives this power circuit output provides to this power state detection circuit; Wherein, when this power state detection signal is this closed condition, this control circuit produces momently this pulse width modulation control signal and controls this first switching circuit and move momently, and to this holding circuit electric energy supplement, the magnitude of voltage of this second boost voltage is kept greater than more than one second critical voltage value.

8. exchange type power conversion circuit as claimed in claim 7, wherein this holding circuit comprises:

One the 3rd diode, the anode tap of the 3rd diode is connected with this first power output end of this power circuit, and the cathode terminal of the 3rd diode is connected with this power state detection circuit; And

One the 5th electric capacity is connected with the cathode terminal of the 3rd diode.

9. exchange type power conversion circuit as claimed in claim 1, wherein this power state detection circuit comprises:

One the 3rd isolated component, the outlet side of the 3rd isolated component is connected in this control circuit;

1 the 15 resistance is connected in series with the input side of the 3rd isolated component.

10. exchange type power conversion circuit as claimed in claim 1 also comprises:

One input rectification circuit is connected in the power input of this power circuit, in order to this input voltage rectification; And

One input capacitance is connected in the power input of power circuit.

11. an exchange type power conversion circuit produces output voltage to a circuit system in order to the electric energy that receives an input voltage, this exchange type power conversion circuit comprises:

One power circuit, it comprises one first switching circuit, in order to the electric energy that receives this input voltage and by this first switching circuit conducting or cut-off and produce respectively this output voltage and one first boost voltage in one first power output end and a second source output;

One feedback circuit is connected in this power circuit, in order to produce a feedback signal according to this output voltage; And

One control unit, be connected in this first switching circuit and this feedback circuit, control this conducting of the first switching circuit or cut-off in order to a closed condition and a running status according to this feedback signal and this circuit system, make this power circuit receive the energy of this input voltage and be converted to this output voltage and this first boost voltage;

Wherein, when the power supply status of this circuit system was this closed condition, this control unit was controlled the out of service or intermittent operation of this first switching circuit, made the magnitude of voltage normality of this output voltage and this first boost voltage be lower than load voltage value or be zero voltage value.

12. exchange type power conversion circuit as claimed in claim 11, wherein this control unit comprises a control circuit, be connected in this first switching circuit and this feedback circuit, in order to control this conducting of the first switching circuit or cut-off according to this feedback signal, make this power circuit receive the energy of this input voltage and be converted to this output voltage and this first boost voltage.

13. exchange type power conversion circuit as claimed in claim 12, wherein this feedback circuit more is connected with this circuit system, and produces this feedback signal according to a power state signal and this output voltage of this circuit system.

14. exchange type power conversion circuit as claimed in claim 13, wherein this control unit also comprises:

One start-up circuit is connected in this circuit system and this control circuit, produces a starting resistor to this control circuit in order to this power state signal according to this circuit system;

Wherein, when this power state signal was this closed condition, the ratio value of this feedback signal and this output voltage was one first feedback proportional value, made this first boost voltage be lower than a working voltage value, and then made this control circuit out of service.

15. exchange type power conversion circuit as claimed in claim 14, when wherein this power state signal was this closed condition, this starting resistor was zero voltage value.

16. exchange type power conversion circuit as claimed in claim 14, when wherein this power state signal is this running status, this start-up circuit starts this control circuit operation by the electric energy of this starting resistor, and the ratio value of this feedback signal and this output voltage is that one second feedback proportional value makes this output voltage and this first boost voltage maintain load voltage value.

17. exchange type power conversion circuit as claimed in claim 12 is connected with this circuit system by an out-put supply connector.

18. exchange type power conversion circuit as claimed in claim 17, wherein this control unit also comprises a power state detection circuit, be connected in this first power output end and this control circuit of this power circuit, whether need this exchange type power conversion circuit that electric energy is provided in order to detect this circuit system, and produce a corresponding power state detection signal; Wherein, this control circuit produces a pulse width modulation control signal according to this power state detection signal and this feedback signal and controls this conducting of the first switching circuit or cut-off, makes the power conversion of this input voltage be this output voltage and this first boost voltage.

19. exchange type power conversion circuit as claimed in claim 18, wherein when this out-put supply connector was connected with this circuit system, this power state detection signal was this running status; When this out-put supply connector separated with this circuit system, this power state detection signal was this closed condition.

20. exchange type power conversion circuit as claimed in claim 19, wherein when this power state detection signal is this closed condition, this control circuit stops to produce constantly this pulse width modulation control signal according to this feedback signal and controls this conducting of the first switching circuit or cut-off, makes this output voltage and this first boost voltage not maintain load voltage value.

21. exchange type power conversion circuit as claimed in claim 19, wherein when this power state detection signal is this closed condition, this control circuit produces momently this pulse width modulation control signal and controls this first switching circuit and move momently, and correspondence makes this output voltage and this first boost voltage rise to momently load voltage value.

22. exchange type power conversion circuit as claimed in claim 19, wherein when this power state detection signal is this closed condition, this control circuit intermittently directly is sent to this second source output of this power circuit with the electric energy of this input voltage via this control circuit, and the magnitude of voltage of this first boost voltage is changed up and down.

23. exchange type power conversion circuit as claimed in claim 19, wherein when this power state detection signal was this closed condition, the magnitude of voltage normality of this output voltage and this first boost voltage was zero voltage value.

24. exchange type power conversion circuit as claimed in claim 19, wherein this control unit also comprises and keeps circuit, be connected between this first power output end and this power state detection circuit of this power circuit, producing one second boost voltage in order to the electric energy that receives this power circuit output provides to this power state detection circuit; Wherein, when this power state detection signal is this closed condition, this control circuit produces momently this pulse width modulation control signal and controls this first switching circuit and move momently, and to this holding circuit electric energy supplement, the magnitude of voltage of this second boost voltage is kept greater than more than one second critical voltage value.

25. exchange type power conversion circuit as claimed in claim 11 also comprises:

One input rectification circuit is connected in the power input of this power circuit, in order to this input voltage rectification; And

One input capacitance is connected in the power input of power circuit.

26. power supply unit, it comprises an exchange type power conversion circuit, produce an output voltage in order to the electric energy that receives an input voltage, and this output voltage is sent to a circuit system of an electronic product via an out-put supply connector, this exchange type power conversion circuit comprises:

One power circuit, it comprises one first switching circuit, in order to the electric energy that receives this input voltage and by this first switching circuit conducting or cut-off and produce respectively this output voltage and one first boost voltage in one first power output end and a second source output;

One feedback circuit is connected in this power circuit, in order to produce a feedback signal according to this output voltage; And

One control unit, be connected in this first switching circuit, this circuit system and this feedback circuit, control this conducting of the first switching circuit or cut-off in order to a closed condition and a running status according to this feedback signal and this circuit system, make this power circuit receive the energy of this input voltage and be converted to this output voltage and this first boost voltage;

Wherein, when the power supply status of this circuit system was this closed condition, this control unit was controlled the out of service or intermittent operation of this first switching circuit, made the magnitude of voltage normality of this output voltage and this first boost voltage be lower than load voltage value or be zero voltage value.

27. power supply unit as claimed in claim 26, wherein this control unit comprises a control circuit, be connected in this first switching circuit and this feedback circuit, in order to control this conducting of the first switching circuit or cut-off according to this feedback signal, make this power circuit receive the energy of this input voltage and be converted to this output voltage and this first boost voltage.

28. power supply unit as claimed in claim 27, wherein this feedback circuit more is connected with this circuit system, and produces this feedback signal according to a power state signal and this output voltage of this circuit system.

29. power supply unit as claimed in claim 28, wherein this control unit also comprises:

One start-up circuit is connected in this circuit system and this control circuit, produces a starting resistor to this control circuit in order to this power state signal according to this circuit system;

Wherein, when this power state signal was this closed condition, the ratio value of this feedback signal and this output voltage was one first feedback proportional value, made this first boost voltage be lower than a working voltage value, and then made this control circuit out of service.

30. power supply unit as claimed in claim 29, when wherein this power state signal was this closed condition, this starting resistor was zero voltage value.

31. power supply unit as claimed in claim 29, when wherein this power state signal is this running status, this start-up circuit starts this control circuit operation by the electric energy of this starting resistor, and the ratio value of this feedback signal and this output voltage is that one second feedback proportional value makes this output voltage and this first boost voltage maintain load voltage value.

32. power supply unit as claimed in claim 27, wherein this control unit also comprises a power state detection circuit, be connected in this first power output end and this control circuit of this power circuit, whether need this exchange type power conversion circuit that electric energy is provided in order to detect this circuit system, and produce a corresponding power state detection signal; Wherein, this control circuit produces a pulse width modulation control signal according to this power state detection signal and this feedback signal and controls this conducting of the first switching circuit or cut-off, makes the power conversion of this input voltage be this output voltage and this first boost voltage.

33. power supply unit as claimed in claim 32, wherein when this out-put supply connector was connected with this circuit system, this power state detection signal was this running status; When this out-put supply connector separated with this circuit system, this power state detection signal was this closed condition.

34. power supply unit as claimed in claim 33, wherein when this power state detection signal is this closed condition, this control circuit stops to produce constantly this pulse width modulation control signal according to this feedback signal and controls this conducting of the first switching circuit or cut-off, makes this output voltage and this first boost voltage not maintain load voltage value.

35. power supply unit as claimed in claim 33, wherein when this power state detection signal is this closed condition, this control circuit produces momently this pulse width modulation control signal and controls this first switching circuit and move momently, and correspondence makes this output voltage and this first boost voltage rise to momently load voltage value.

36. power supply unit as claimed in claim 33, wherein when this power state detection signal is this closed condition, this control circuit intermittently directly is sent to this second source output of this power circuit with the electric energy of this input voltage via this control circuit, and the magnitude of voltage of this first boost voltage is changed up and down.

37. power supply unit as claimed in claim 33, wherein when this power state detection signal was this closed condition, the magnitude of voltage normality of this output voltage and this first boost voltage was zero voltage value.

38. power supply unit as claimed in claim 33, wherein this control unit also comprises and keeps circuit, be connected between this first power output end and this power state detection circuit of this power circuit, producing one second boost voltage in order to the electric energy that receives this power circuit output provides to this power state detection circuit; Wherein, when this power state detection signal is this closed condition, this control circuit produces momently this pulse width modulation control signal and controls this first switching circuit and move momently, and to this holding circuit electric energy supplement, the magnitude of voltage of this second boost voltage is kept greater than more than one second critical voltage value.

39. power supply unit as claimed in claim 26 also comprises:

One input rectification circuit is connected in the power input of this power circuit, in order to this input voltage rectification; And

One input capacitance is connected in the power input of power circuit.

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