CN102983750B - Switching power-conversion circuit and applicable power supply unit of same - Google Patents

Switching power-conversion circuit and applicable power supply unit of same Download PDF

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CN102983750B
CN102983750B CN201210482950.3A CN201210482950A CN102983750B CN 102983750 B CN102983750 B CN 102983750B CN 201210482950 A CN201210482950 A CN 201210482950A CN 102983750 B CN102983750 B CN 102983750B
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circuit
power
voltage
state detection
exchange type
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CN102983750A (en
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蒋进财
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Delta Electronics Inc
Delta Optoelectronics Inc
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Delta Optoelectronics Inc
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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
The present invention is a divisional application, and the applying date of original application is on July 23rd, 2009, and application number is 200910160470.3, denomination of invention for: exchange type power conversion circuit and the power supply unit that is suitable for.
Technical field
The present invention relates to a kind of power-switching circuit, particularly relate to a kind of exchange type power conversion circuit and the power supply unit that is suitable for.
Background technology
In recent years along with the progress of science and technology, the electronic product with difference in functionality of all kinds is developed gradually, these electronic products with difference in functionality of all kinds not only meet the various different demand of people, more incorporate everyone daily life, people are lived more convenient.
The electronic product of these difference in functionalitys of all kinds is made up of various electronic component, and the supply voltage needed for each electronic component is not quite similar, and therefore, the AC power that electric power system now provides also is not suitable for directly being supplied to electronic product use.In order to provide suitable voltage to make it normally run to each electronic component, these electronic products need by power-switching circuit by AC power, such as general civil power, are converted to suitable voltage and use to each electronic component.
Power-switching circuit is according to the difference of its circuit structure, about can divide into linear formula and exchange type power conversion circuit two kinds roughly, simple linear formula power-switching circuit is made up 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 is low, so cannot be used in small volume or the long-time electronic product used.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 long-time use or miniaturization can use exchange type power conversion circuit mostly.
Although, exchange type power conversion circuit has higher conversion efficiency, but, no matter traditional exchange type power conversion circuit is the need of providing electric energy to load or electronic product, this exchange type power conversion circuit still can continuous service always, makes output voltage maintain load voltage value.Therefore, even if 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 consume electric energy, causes exchange type power conversion circuit in not providing electric energy to having higher power consumption when load or electronic product.
From the above, tradition exchange type power conversion circuit is when the electric energy that load or electronic product do not use this exchange type power conversion circuit to provide, such as, when load or electronic product are out of service, tradition exchange type power conversion circuit still can continuous service, cause integrated circuit to have higher power consumption, do not meet energy saving characteristic.If when using the power supply unit of traditional exchange type power conversion circuit to provide electric energy to electronic product, even if user does not use electronic product, power supply unit still can continuous service and consume unnecessary electric energy.
Therefore, how to develop a kind of exchange type power conversion circuit improving above-mentioned known technology defect, real is the current 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, in time not needing to provide electric energy to load or electronic product, such as, when load or electronic product are out of service, integrated circuit has lower power consumption, to meet energy saving characteristic.This exchange type power conversion circuit is used in power supply unit and provides electric energy to electronic product, can, when user does not use electronic product, make power supply unit have lower power consumption.
For reaching above-mentioned purpose, of the present invention one comparatively broad embodiment for providing a kind of exchange type power conversion circuit, output voltage is produced to circuit system in order to receive the electric energy of input voltage, exchange type power conversion circuit comprises: power circuit, it comprises the first switching circuit, in order to receive the electric energy of input voltage and to produce output voltage and the first boost voltage by the first switching circuit conducting or cut-off respectively in the first power output end and second source output; Feedback circuit, is connected to power circuit, in order to produce feedback signal according to the power state signal of circuit system and output voltage; Control circuit, is connected to the first switching circuit and feedback circuit, in order to control the first switching circuit conducting or cut-off according to feedback signal, makes this power circuit receive the energy of input voltage and be converted to output voltage and the first boost voltage; And start-up circuit, be connected to circuit system and control circuit, in order to starting resistor will be produced to control circuit according to power state signal; Wherein, when power state signal is closed condition, the ratio value of feedback signal and output voltage is the first feedback proportional value, and makes the first boost voltage lower than working voltage value, and then makes control circuit out of service.
For reaching above-mentioned purpose, of the present invention another comparatively broad embodiment for providing a kind of exchange type power conversion circuit, output voltage is produced in order to receive the electric energy of input voltage, and output voltage is sent to the circuit system of electronic product via out-put supply connector, exchange type power conversion circuit comprises: power circuit, it comprises the first switching circuit, in order to receive the electric energy of input voltage and to produce output voltage and the first boost voltage by the first switching circuit conducting or cut-off respectively in the first power output end and second source output; Feedback circuit, is connected to power circuit, in order to produce feedback signal according to output voltage; And power state detection circuit, be connected to the first power output end of power circuit, provide electric energy in order to detection system circuit the need of exchange type power conversion circuit, and produce corresponding power state detection signal; Control circuit, be connected to 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 power state detection signal is closed condition, control circuit controls the out of service or intermittent operation of the first switching circuit, makes the magnitude of voltage normality of output voltage and the first boost voltage lower than load voltage value or is zero voltage value.
For reaching above-mentioned purpose, of the present invention another comparatively broad embodiment for providing a kind of exchange type power conversion circuit, output voltage is produced to circuit system in order to receive the electric energy of input voltage, exchange type power conversion circuit comprises: power circuit, it comprises the first switching circuit, in order to receive the electric energy of input voltage and to produce output voltage and the first boost voltage by the first switching circuit conducting or cut-off respectively in the first power output end and second source output; Feedback circuit, is connected to power circuit, in order to produce feedback signal according to output voltage; And control unit, be connected to the first switching circuit and feedback circuit, in order to control the first switching circuit conducting or cut-off according to the closed condition of feedback signal and circuit system and running status, power circuit is made to receive the energy of input voltage and be converted to output voltage and the first boost voltage; Wherein, when the power supply status of circuit system is closed condition, control unit controls the out of service or intermittent operation of the first switching circuit, makes the magnitude of voltage normality of output voltage and the first boost voltage lower than load voltage value or is zero voltage value.
For reaching above-mentioned purpose, of the present invention another comparatively broad embodiment for providing a kind of power supply unit, it comprises exchange type power conversion circuit, output voltage is produced in order to receive the electric energy of input voltage, and output voltage is sent to the circuit system of electronic product via out-put supply connector, exchange type power conversion circuit comprises: a power circuit, it comprises the first switching circuit, in order to receive the electric energy of input voltage and to produce output voltage and the first boost voltage by the first switching circuit conducting or cut-off respectively in the first power output end and second source output, feedback circuit, is connected to power circuit, in order to produce feedback signal according to output voltage, and control unit, be connected to the first switching circuit, circuit system and feedback circuit, in order to control the first switching circuit conducting or cut-off according to the closed condition of feedback signal and circuit system and running status, power circuit is made to receive the energy of input voltage and be converted to output voltage and the first boost voltage, wherein, when the power supply status of circuit system is closed condition, this control unit controls the out of service or intermittent operation of the first switching circuit, makes the magnitude of voltage normality of output voltage and the first boost voltage lower than load voltage value or is zero voltage value.
Exchange type power conversion circuit of the present invention, when the circuit system not needing to provide electric energy to load or electronic product, such as, when load or electronic product are out of service, start-up circuit by feedback circuit and control unit makes the control circuit of control unit out of service, and then makes exchange type power conversion circuit out of service.More can utilize the power state detection signal that the power state detection circuit of control unit produces according to the power supply status of electronic product, the control circuit of control unit is intermittently run, do not continue to make the magnitude of voltage of the output voltage of exchange type power conversion circuit to maintain load voltage value, or be zero voltage value.Therefore, integrated circuit has lower power consumption, and input voltage need not be adjusted to zero voltage value or interruption, and exchange type power conversion circuit of the present invention will be out of service, to meet energy saving characteristic.In addition, exchange type power conversion circuit of the present invention can be applicable to power supply unit and provides electric energy to the circuit system of electronic product, and can when user does not 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, namely power supply unit can be made out of service, and there is lower power consumption.
Accompanying drawing explanation
Fig. 1: be the circuitry block schematic diagram of the exchange type power conversion circuit of present pre-ferred embodiments.
Fig. 2: be the signal sequence schematic diagram of present pre-ferred embodiments.
Fig. 3: be the detailed circuit schematic of the exchange type power conversion circuit of present pre-ferred embodiments.
Fig. 4: be the circuitry block schematic 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 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: second source output 111: the first switching circuit
112: the first current rectifying and wave filtering circuit 113: the second current rectifying and wave filtering circuits
114: current detection circuit 12a, 12b: feedback circuit
The adjustable voltage stabilizing element 121a of 121: three 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: accelerating circuit 131: the second isolated component
132: the three isolated component 133: the first coupled switchs
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 holds COM2: the second jointly to hold 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: power state detection signal
Embodiment
Some exemplary embodiments embodying feature & benefits of the present invention describe in detail in the explanation of back segment.Be understood that the present invention can have various changes in different modes, it neither departs from the scope of the present invention, and explanation wherein and accompanying drawing are in itself when the use explained, and is not used to limit the present invention.
Refer to Fig. 1, it is the circuitry block schematic diagram of the exchange type power conversion circuit of present pre-ferred embodiments.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, comprises 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 produce output voltage V by the first switching circuit 111 conducting or cut-off respectively in the first power output end 11a and second source output 11b owith the first boost voltage V cc.Feedback circuit 12a is connected to the first power output end 11a and the control circuit 13a1 of power circuit 11, in order to the power state signal V provided according to the circuit system 2 of electronic product stwith output voltage V oproduce feedback signal V fb.Control circuit 13a1 is connected to 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 the first switching circuit 111 conducting or cut-off, with by input voltage V inpower conversion be output voltage V owith the first boost voltage V cc.Start-up circuit 13a2 is connected to the power input of power circuit 11, circuit system 2 and control circuit 13a1, 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.
Refer to Fig. 2 and coordinate Fig. 1, Fig. 2 is the signal sequence schematic diagram of present pre-ferred embodiments.As shown in Figure 1, in very first time t 1before, power state signal V stfor the running status of high potential, represent that circuit system 2 needs exchange type power conversion circuit 1 to provide electric energy.Now, feedback circuit 12a is according to output voltage V othe corresponding feedback signal V produced fbwith output voltage V oratio value control circuit 13a1 can be made according to feedback signal V fbcontrol the output voltage V that power circuit 11 exports owith the first boost voltage V ccmaintain load voltage value, to provide electric energy to circuit system 2 and control circuit 13a1 respectively.Due to, be provided to the first boost voltage V of control circuit 13a1 ccmagnitude of voltage be greater than control circuit 13a1 and normally run required working voltage value V on, therefore, control circuit 13a1 understands continuous service and produces pulse width modulation control signal V pWMcontrol the first switching circuit 111 conducting or cut-off, with by input voltage V inpower conversion be output voltage V owith the first boost voltage V cc.
In very first time t 1time, power state signal V stchanged into the closed condition of zero potential or electronegative potential by the running status of high potential, represent that circuit system 2 does not need exchange type power conversion circuit 1 to provide electric energy.Now, feedback circuit 12a is according to output voltage V othe corresponding feedback signal V produced fbwith output voltage V oratio value control circuit 13a1 can be made according to feedback signal V fbcontrol the first boost voltage V that power circuit 11 exports cclower than working voltage value V on, and then make control circuit 13a1 out of service, continue and make output voltage V owith the first boost voltage V ccfor zero voltage value.Because now start-up circuit 13a2 can according to the power state signal V being closed condition stmake starting resistor V hmagnitude of voltage be zero voltage value, even if therefore input voltage V incan continue to provide electric energy to start-up circuit 13a2, start-up circuit 13a2 also can not use input voltage V 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 ccfor zero voltage value, exchange type power conversion circuit 1 stops providing electric energy to circuit system 2.
In the second time t 2time, power state signal V stchanged into the running status of high potential by the closed condition of zero potential or electronegative potential, now, start-up circuit 13a2 can according to the power state signal V being running status stmake input voltage V inelectric energy be sent to control circuit 13a1, also i.e. starting resistor V hfor non-zero voltage value, then via control circuit 13a1 by 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 onabove, and start control circuit 13a1 and run, and can start to produce pulse width modulation control signal V after control circuit 13a1 startup optimization pWMcontrol the first switching circuit 111 conducting or cut-off.Now, power state signal V stfor the running status of high potential, feedback circuit 12a is according to output voltage V othe corresponding feedback signal V produced fbwith output voltage V oratio value control circuit 13a1 can be made according to feedback signal V fbcontrol the output voltage V that power circuit 11 exports owith the first boost voltage V ccmaintain load voltage value, to provide electric energy to circuit system 2 and control circuit 13a1 respectively.
Due to power circuit 11, feedback circuit 12a, control circuit 13a1 and start-up circuit 13a2 huge number, below explanation will be exemplified.Refer to Fig. 3, it is the detailed circuit schematic of the exchange type power conversion circuit of present pre-ferred embodiments.As shown in Figure 3, power circuit 11 comprises the first switching circuit 111, first current rectifying and wave filtering circuit 112, 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 pone end be connected to the first switch element Q 1first end Q 1a, and the first switch element Q 1the second end Q 1bbe connected to first with control end and jointly hold COM1 and control circuit 13a1, the pulse width modulation control signal V produced by control circuit 13a1 pWMmake the first switch element Q 1conducting or cut-off, and then by 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-filtering to produce output voltage V owith the first boost voltage V cc.
First current rectifying and wave filtering circuit 112 is connected to transformer T rsecondary winding N sand between the circuit system 2 of electronic product, and comprise the first diode D 1with the first electric capacity C 1.First diode D 1anode tap and transformer T rsecondary winding N sconnect, the first diode D 1cathode terminal be connected to circuit system 2 and the first electric capacity C 1one end, the first electric capacity C 1the the first power output end 11a and second being connected to power circuit 11 holds between COM2 jointly.Second current rectifying and wave filtering circuit 113 is connected to transformer T rauxiliary winding Na and control circuit 13a1 between, and comprise the second diode D 2with the second electric capacity C 2.Second diode D 2anode tap and transformer T rauxiliary winding N aconnect, the second diode D 2cathode terminal be connected to control circuit 13a1 and the second electric capacity C 2one end, the second electric capacity C 2the second source output 11b and first being connected to power circuit 11 holds between COM1 jointly.
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 (3-Terminal Adjustable Regulator) of three ends, wherein, the first resistance R 1be connected to the first power output end 11a and the first link K of power circuit 11 1between, the second resistance R 2be connected to the first link K 1and second holds between COM2 jointly, and the first resistance R 1with the second resistance R 2form the first bleeder circuit, in order to by output voltage V othe adjustable voltage stabilizing element 121 of three ends reference edge 121r dividing potential drop and produce the first voltage division signal V 1.
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 to control circuit 13a1, can according to the first electric current I of inflow first isolated component 122 input side 1size of current produce corresponding feedback signal V fb.The input side of the first isolated component 122 and the 4th resistance R 4between the cathode terminal 121c (cathode) being connected in series in the adjustable voltage stabilizing element 121 of three ends and the first power output end 11a of power circuit 11, in order to first electric current I of the cathode terminal 121c or the first isolated component 122 input side that limit the adjustable voltage stabilizing element 121 of inflow three end 1size of current, the 4th resistance R 4restriction first electric current I just can be reached for being connected in series with the input side of the first isolated component 122 1effect of size of current.In some embodiments, the 4th resistance R 4the priority position be connected in series with the input side of the first isolated component 122 can exchange, contrary with shown in Fig. 3 (not shown).
The optional use of three ends adjustable voltage stabilizing element 121 such as National Semiconductor (NationalSemiconductor) model is that the IC of LM317 realizes, but not as limit.Anode tap 121a (Anode) and the reference edge 121r of the adjustable voltage stabilizing element 121 of three ends are connected to second and jointly hold 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, such as 1.25 volts (V), the automatically size of current of corresponding adjustment the first electric current I 1, make the outlet side of the first isolated component 122 according to output voltage V ochange produce feedback signal V fb.3rd resistance R 3with second switch element Q 2be connected in series in the second resistance R 2between two ends, and second switch element Q 2control end be connected to circuit system 2, and in power state signal V strunning status for 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 3one end be connected to second switch element Q 2first end Q 2a, the 3rd resistance R 3the other end be connected to the first link K 1, second switch element Q 2the second end Q 2bbe connected to second and jointly hold 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 to power input and the second link K of power circuit 11 2between, the 8th resistance R 8be connected to the second link K 2and first holds between COM1 jointly, wherein, the 7th resistance R 7with the 8th resistance R 8the second bleeder circuit can be formed, in order to utilize input voltage V inelectric energy produce the second voltage division signal V at the second link K2 2.3rd 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 to 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 in circuit system 2 and second jointly to hold between COM2.Similarly, the second isolated component 131 can be but not be defined as optical coupling isolated component.
As power state signal V stduring running status for high potential, the second voltage division signal V 2the 3rd switch element Q can be sent to via the outlet side of the second isolated component 131 3control end, make input voltage V inelectric energy be sent to control circuit 13a1, now, starting resistor V helectric energy can be sent to the second electric capacity C of power circuit 11 inside via control circuit 13a1 2, make the first boost voltage V ccmagnitude of voltage rise to working voltage value V onabove, start control circuit 13a1 to run.On the contrary, as power state signal V stduring closed condition for zero potential or electronegative potential, the second voltage division signal V 2then cannot be sent to the 3rd switch element Q via the outlet side of the second isolated component 131 3control end, now, starting resistor V hfor zero voltage value, starting resistor V hcontrol circuit 13a1 cannot be started run.
As for feedback circuit 12a, as power state signal V stduring closed condition for zero potential or electronegative potential, second switch element Q 2cut-off, the 3rd resistance R 3can not with the second resistance R 2be connected in parallel, now, 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 ratios value A 1, the first voltage division signal V 1with output voltage V orelational expression (formula 1) be:
V 1 = R 2 R 1 + R 2 · V o = A 1 · V o .
As power state signal V stduring running status for 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, now, 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 ratios value A 2, the first voltage division signal V 1with output voltage V orelational expression (formula 2) be:
V 1 = ( R 2 / / R 3 ) R 1 + ( R 2 / / R 3 ) · V o = A 2 · V o .
From the above, the first dividing ratios value A 1be greater than the second dividing ratios value A 2, so the first feedback proportional value is greater than the second feedback proportional value.In other words, as power state signal V stduring running status for 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 fbcontrol the output voltage V that power circuit 11 exports 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 fbcontrol the first boost voltage V that power circuit 11 exports cclower than load voltage value and working voltage value V on, and then make control circuit 13a1 out of service.
Fig. 4 is the circuitry block schematic diagram of the exchange type power conversion circuit of another preferred embodiment of the present invention.As best shown in figs. 1 and 4, in this embodiment, exchange type power conversion circuit 1 is similar to the configuration and principle shown in Fig. 1, repeats no more in this.With structure difference shown in Fig. 1, exchange type power conversion circuit 1 shown in Fig. 4 is that 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 to the power input of power circuit 11, in order to the input voltage V to alternating current inrectification, and input capacitance C inthe power input and first being then connected to power circuit 11 is held between COM1 jointly.
Fig. 5 is the detailed circuit schematic of the exchange type power conversion circuit of the another preferred embodiment of the present invention.As shown in Fig. 3 and Fig. 5, in this embodiment, exchange type power conversion circuit 1 is similar to the configuration and principle shown in Fig. 3, repeats no more in this.Difference is that the exchange type power conversion circuit 1 shown in Fig. 5 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 electric capacity C 3and the 4th electric capacity C 4.In the present embodiment, current detection circuit 114 comprises detection resistance R s, be connected to the first switch element Q 1the second end Q 1band first holds between COM1 jointly, is 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 to the power input of power circuit 11, in order to the input voltage V to alternating current inrectification, and input capacitance C inthe power input and first being then connected to power circuit 11 is held between COM1 jointly.
The control unit 13a (non-label) of Fig. 5, except comprising control circuit 13a1 and start-up circuit 13a2, also comprises accelerating circuit 13a3 and the 11 resistance R 11, wherein, accelerating circuit 13a3 is connected to the first switch element Q 1control end and control circuit 13a1 between, in order to accelerate the first switch element Q 1run.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 to the first switch element Q 1control end, the 12 resistance R 12be connected to the first switch element Q 1control end and control circuit 13a1 between, the 13 resistance R 13be connected to the 4th switch element Q 4control end and first end Q 4abetween, the 14 resistance R 14be connected to the 4th switch element Q 4the second end Q 4band first holds between COM1 jointly.In pulse width modulation control signal V pWMwhen changing zero potential or low-potential state into by high potential state, discharge path can 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 electric capacity C 3and the 4th electric capacity C 4, wherein, the 5th resistance R 5be connected to second switch element Q 2control end and circuit system 2 between, the 6th resistance R 6be connected to second switch element Q 2control end and second jointly hold between COM2, and the 5th resistance R 5with the 6th resistance R 6form input bleeder circuit, in order to by power state signal V stat second switch element Q 2control end dividing potential drop.3rd electric capacity C 3be connected to second switch element Q 2control end and second jointly hold between COM2, in order to stress release treatment.4th electric capacity C 4between the reference edge 121r being connected to the adjustable voltage stabilizing element 121 of three ends and cathode terminal 121c, 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 to the 3rd switch element Q 3the second end Q 3band between control end, in order to prevent because of the 3rd switch element Q 3control end have noise and make the 3rd switch element Q 3mistake start.Similarly, the 11 resistance R 11be connected to the first switch element Q 1control end and first jointly hold between COM1, in order to prevent because of the first switch element Q 1control end have noise and make the first switch element Q 1mistake start.
Refer to Fig. 6 A and coordinate 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, wherein, feedback circuit 12b is only according to output voltage V oproduce feedback signal V fb, so feedback signal V fbwith output voltage V oratio value be fixing, can not 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 to the first power output end 11a, control circuit 13b1 and the out-put supply connector 1a of power circuit 11, there is provided electric energy in order to detection system circuit 2 the need of exchange type power conversion circuit 1, and produce corresponding power state detection signal V a.Control unit 13b is then connected to control end and the feedback circuit 12b of power circuit 11, 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 the first switching circuit 111 conducting or cut-off, with by 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 to control circuit 13b1, and the input side of the 3rd isolated component 132 and the 15 resistance R 15be connected in series, the input side of the 3rd isolated component 132 after being connected in series and the 15 resistance R 15one end be connected to the first power output end 11a of power circuit 11, the other end is then connected with the circuit system 2 of electronic product by out-put supply connector 1a.
In the present embodiment, when out-put supply connector 1a is connected with the circuit system 2 of electronic product by user, the input side of the 3rd isolated component 132 and the 15 resistance R 15by circuit system 2 Inner Constitution loop, the second electric current I of the input side of inflow the 3rd isolated component 132 can be made 2non-vanishing current value, correspondence makes power state detection signal V afor the running status of zero potential or electronegative potential.On the contrary, when out-put supply connector 1a is separated with the circuit system 2 of electronic product by user, the input side of the 3rd isolated component 132 and the 15 resistance R 15just circuit system 2 Inner Constitution loop, now the second electric current I cannot be passed through 2for zero current value, correspondence makes power state detection signal V afor the closed condition of high potential.
Refer to Fig. 6 B and coordinate 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, conducting or cut-off in order to the annexation according to out-put supply connector 1a and circuit system 2.In the present embodiment, input side, the 15 resistance R of the 3rd isolated component 132 15be connected in series with the first coupled switch 133, input side, the 15 resistance R of the 3rd isolated component 132 after being connected in series 15be connected to the first power output end 11a of power circuit 11 with one end of the first coupled switch 133, the other end is then connected to second and jointly holds COM2.
Similarly, when out-put supply connector 1a is connected with the circuit system 2 of electronic product by user, the corresponding conducting of the first coupled switch 133 meeting, the input side of the 3rd isolated component 132 and the 15 resistance R 15loop can be formed by the first coupled switch 133, make the second electric current I of the input side of inflow the 3rd isolated component 132 2non-vanishing current value, correspondence makes power state detection signal V afor the running status of zero potential or electronegative potential.On the contrary, when out-put supply connector 1a is separated with the circuit system 2 of electronic product by user, the first coupled switch 133 can correspondingly end, the input side of the 3rd isolated component 132 and the 15 resistance R 15just loop cannot be formed, now the second electric current I 2for zero current value, correspondence makes power state detection signal V afor the closed condition of high potential.
Refer to Fig. 7 and coordinate Fig. 6 A and Fig. 6 B, Fig. 7 to be 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 makes power state detection signal V afor the running status of zero potential or electronegative potential.Now, the power state detection signal V of running status acontrol circuit 13b1 can be made according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off, with by output voltage V owith the first boost voltage V ccmaintain load voltage value.
In the 3rd time t3, out-put supply connector 1a is separated with the circuit system 2 of electronic product, the second electric current I 2can change into zero current value, correspondence makes power state detection signal V achange into the closed condition of high potential.Now, the power state detection signal V of closed condition acontrol circuit 13b1 can be made to stop according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off.In like manner, in the 3rd time t 3to the 6th time t 6between, power state detection signal V afor closed condition, control circuit 13b1 can stop according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off, correspondence makes output voltage V owith the first boost voltage V ccload voltage value cannot be maintained.
In the 3rd time t 3to the 4th time t 4between, control circuit 13b1 can stop producing pulse width modulation control signal V pWMto the first switching circuit 111, correspondence makes output voltage V omagnitude of voltage continuous decrease lower than load voltage value, but control circuit 13b1 can be intermittently direct by input voltage V inthe electric energy second source output 11b that is sent to power circuit 11 via control circuit 13b1, make the first boost voltage V ccmagnitude of voltage can change up and down.In power state detection signal V afor the 4th time t of 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 to run momently, correspondence makes output voltage V owith the first boost voltage V ccrise to load voltage value momently.
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 non-zero current value, correspondence makes power state detection signal V achange into running status.Now, the power state detection signal V of running status acontrol circuit 13b1 can be made according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off, with by 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 pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting 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 comparatively run to power saving.In the present embodiment, at power state detection signal V afor the 3rd time t of closed condition 3to the 6th time t 6between, power state detection signal V amagnitude of voltage can maintain fixed voltage value and can not change up and down.In certain embodiments, at power state detection signal V afor the 3rd time t of 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 afor the closed condition of high potential.
Refer to Fig. 8 A and coordinate 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.With circuit structure difference shown in Fig. 6 A, exchange type power conversion circuit 1 shown in Fig. 8 A is that 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 to the power input of power circuit 11, in order to the input voltage V to alternating current inrectification, and input capacitance C inthe power input and first being then connected to power circuit 11 is held between COM1 jointly.
Refer to Fig. 8 B and coordinate 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.With circuit structure difference shown in Fig. 6 B, exchange type power conversion circuit 1 shown in Fig. 8 B is that 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 to the power input of power circuit 11, in order to the input voltage V to alternating current inrectification, and input capacitance C inthe power input and first being then connected to power circuit 11 is held between COM1 jointly.
Refer to Fig. 9 A and coordinate 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 to the first power output end 11a, second end COM2 and power state detection circuit 13d2 jointly of power circuit 11, produce the second boost voltage V in order to receive the electric energy of power circuit 11 output bbe provided to power state detection circuit 13d2.
In the present embodiment, holding circuit 134 comprises the 3rd diode D 3with the 5th electric capacity C 5, wherein, the 5th electric capacity C 5one end jointly hold COM2 to be connected with second, the 5th electric capacity 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 to power state detection circuit 13d2.Power state detection circuit 13d2 is except comprising the 3rd isolated component and the 15 resistance R 15outward, Detection capacitance C is also comprised tbe connected to control circuit 13c1 and first jointly to hold between COM1.Similarly, the outlet side of the 3rd isolated component 132 is connected to control circuit 13c1, and the input side of the 3rd isolated component 132 and the 15 resistance R 15be connected in series, the input side of the 3rd isolated component 132 after being connected in series and the 15 resistance R 15one end be connected to the power output end of holding circuit 134, the other end is then connected with the circuit system 2 of electronic product by out-put supply connector 1a.
Similarly, when out-put supply connector 1a is connected with the circuit system 2 of electronic product by user, the input side of the 3rd isolated component 132 and the 15 resistance R 15by circuit system 2 Inner Constitution loop, the second electric current I of the input side of inflow the 3rd isolated component 132 can be made 2non-vanishing current value, correspondence makes power state detection signal V afor the running status of zero potential or electronegative potential.On the contrary, when out-put supply connector 1a is separated with the circuit system 2 of electronic product by user, the input side of the 3rd isolated component 132 and the 15 resistance R 15just circuit system 2 Inner Constitution loop, now the second electric current I cannot be passed through 2for zero current value, correspondence makes power state detection signal V afor the closed condition of high potential.
Refer to Fig. 9 B and coordinate 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, conducting or cut-off in order to the annexation according to out-put supply connector 1a and circuit system 2.In the present embodiment, input side, the 15 resistance R of the 3rd isolated component 132 15be connected in series with the first coupled switch 133, input side, the 15 resistance R of the 3rd isolated component 132 after being connected in series 15be connected to the power output end of holding circuit 134 with one end of the first coupled switch 133, the other end is then connected to second and jointly holds COM2.
Similarly, when out-put supply connector 1a is connected with the circuit system 2 of electronic product by user, the corresponding conducting of the first coupled switch 133 meeting, the input side of the 3rd isolated component 132 and the 15 resistance R 15loop can be formed by the first coupled switch 133, make the second electric current I of the input side of inflow the 3rd isolated component 132 2non-vanishing current value, correspondence makes power state detection signal V afor the running status of zero potential or electronegative potential.On the contrary, when out-put supply connector 1a is separated with the circuit system 2 of electronic product by user, the first coupled switch 133 can correspondingly end, the input side of the 3rd isolated component 132 and the 15 resistance R 15just loop cannot be formed, now the second electric current I 2for zero current value, correspondence makes power state detection signal V afor the closed condition of high potential.
Fig. 9 A and Fig. 9 B, Figure 10 is coordinated to be the signal sequence schematic diagram of Fig. 9 A of the present invention and Fig. 9 B referring again to Figure 10.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 makes power state detection signal V afor the running status of zero potential or electronegative potential.Now, the power state detection signal V of running status acontrol circuit 13c1 can be made according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off, with by 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 is separated with the circuit system 2 of electronic product, the second electric current I 2can change into zero current value, correspondence makes power state detection signal V achange into the closed condition of high potential.Now, the power state detection signal V of closed condition acontrol circuit 13c1 can be made to stop according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off.In like manner, in the 7th time t 7between the tenth time t10, power state detection signal V afor closed condition, control circuit 13c1 can stop according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off, correspondence makes output voltage V owith the first boost voltage V ccload voltage value cannot be maintained.
In the present embodiment, in the 7th time t 7to the tenth time t 10between, power state detection signal V afor the closed condition of non-zero voltage value, control circuit 13c1 can be intermittently direct by 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 be greater than the first critical voltage value V 1a.Although, Detection capacitance C tpower state detection signal V can be made when charge and discharge amagnitude of voltage change up and down, but, 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 afor the closed condition of high potential.
In the 7th time t 7to the 8th time t 8between, control circuit 13c1 can stop producing pulse width modulation control signal V pWMto the first switching circuit 111, correspondence makes output voltage V omagnitude of voltage continuous decrease lower than load voltage value, but holding circuit 134 can continue the second boost voltage V bmagnitude of voltage maintain be greater than the second critical voltage value V 2babove.When out-put supply connector 1a is 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, make power state detection signal V acorrespondence changes into the running status of zero potential or electronegative potential.
In order to make the second boost voltage V bmagnitude of voltage maintain be greater than the second critical voltage value V 2babove, in power state detection signal V afor the 8th time t of 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 to run momently, correspondence makes output voltage V o, the first boost voltage V ccand the first boost voltage V ccrise to load voltage value momently, and the 5th electric capacity C to holding circuit 134 5electric energy supplement, so the second boost voltage V bmagnitude of voltage can maintain and be greater than the second critical voltage value V 2babove.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 ccmagnitude 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 non-zero current value, correspondence makes power state detection signal V achange into running status.Now, the power state detection signal V of running status acontrol circuit 13b1 can be made according to feedback signal V fbproduce pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting or cut-off, with by 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 pulse width modulation control signal V constantly pWMcontrol the first switching circuit 111 conducting 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 comparatively run to power saving.
Refer to Figure 11 A and coordinate 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.With circuit structure difference shown in Fig. 9 A, exchange type power conversion circuit 1 shown in Figure 11 A is that 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 to the power input of power circuit 11, in order to the input voltage V to alternating current inrectification, and input capacitance C inthe power input and first being then connected to power circuit 11 is held between COM1 jointly.
Refer to Figure 11 B and coordinate 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.With circuit structure difference shown in Fig. 9 B, exchange type power conversion circuit 1 shown in Figure 11 B is that 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 to the power input of power circuit 11, in order to the input voltage V to alternating current inrectification, and input capacitance C inthe power input and first being then connected to power circuit 11 is held between COM1 jointly.
Refer to Figure 12 and coordinate Fig. 3, Figure 12 is the detailed circuit schematic of the feedback circuit of another preferred embodiment of the present invention.The feedback circuit 12a of feedback circuit 12b and Fig. 3 of Figure 12 is similar, 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, or mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) BJT).
In sum, exchange type power conversion circuit of the present invention, when the circuit system not needing to provide electric energy to load or electronic product, such as, when load or electronic product are out of service, start-up circuit by feedback circuit and control unit makes the control circuit of control unit out of service, and then makes exchange type power conversion circuit out of service.More can utilize the power state detection signal that the power state detection circuit of control unit produces according to the power supply status of electronic product, the control circuit of control unit is intermittently run, do not continue to make the magnitude of voltage of the output voltage of exchange type power conversion circuit to maintain load voltage value, or be zero voltage value.Therefore, integrated circuit has lower power consumption, and input voltage vin need not be adjusted to zero voltage value or interruption, and exchange type power conversion circuit of the present invention will be out of service, to meet energy saving characteristic.In addition, exchange type power conversion circuit of the present invention can be applicable to power supply unit and provides electric energy to the circuit system of electronic product, and when user does not use electronic product, power supply unit can be made out of service, therefore will do not removed and interrupting input voltage V by socket by power supply unit in, power supply unit namely can be made out of service, and there is lower power consumption.
The present invention must be appointed by those of ordinary skill in the art and executes craftsman and to think and for modifying as all, so neither de-as the scope of attached claim institute for protecting.

Claims (39)

1. an exchange type power conversion circuit, produces an output voltage in order to receive the electric energy of 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 receive the electric energy of this input voltage and to produce this output voltage and one first boost voltage by this first switching circuit conducting or cut-off respectively in one first power output end and a second source output;
One feedback circuit, is connected to this power circuit, in order to produce a feedback signal according to this output voltage; And
One power state detection circuit, is connected to this first power output end of this power circuit, provides electric energy in order to detect this circuit system the need of this exchange type power conversion circuit, and produces a corresponding power state detection signal;
One control circuit, be connected to 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 is a closed condition, this control circuit controls the out of service or intermittent operation of this first switching circuit, makes the magnitude of voltage normality of this output voltage and this first boost voltage lower than load voltage value or is zero voltage value.
2. exchange type power conversion circuit as claimed in claim 1, wherein when this out-put supply connector is connected with this circuit system, this power state detection signal is a running status; When this out-put supply connector is separated with this circuit system, this power state detection signal is 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 producing this pulse width modulation control signal constantly 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 this pulse width modulation control signal momently and controls this first switching circuit and run momently, and correspondence makes this output voltage and this first boost voltage rise to load voltage value momently.
5. exchange type power conversion circuit as claimed in claim 2, wherein when this power state detection signal is this closed condition, intermittently direct this second source output electric energy of this input voltage being sent to this power circuit via this control circuit of this control circuit, makes the magnitude of voltage of this first boost voltage change up and down.
6. exchange type power conversion circuit as claimed in claim 2, wherein when this power state detection signal is this closed condition, the magnitude of voltage normality of this output voltage and this first boost voltage is zero voltage value.
7. exchange type power conversion circuit as claimed in claim 2, also comprise a holding circuit, be connected between this first power output end of this power circuit and this power state detection circuit, produce one second boost voltage be provided to this power state detection circuit in order to receive electric energy that this power circuit exports; Wherein, when this power state detection signal is this closed condition, this control circuit produces this pulse width modulation control signal momently and controls this first switching circuit and run momently, and to this holding circuit electric energy supplement, the magnitude of voltage of this second boost voltage is maintained and is 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 to 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 to the power input of this power circuit, in order to this input voltage rectification; And
One input capacitance, is connected to the power input of power circuit.
11. 1 kinds of exchange type power conversion circuits, produce output voltage to circuit system in order to receive the electric energy of an input voltage, this exchange type power conversion circuit comprises:
One power circuit, it comprises one first switching circuit, in order to receive the electric energy of this input voltage and to produce this output voltage and one first boost voltage by this first switching circuit conducting or cut-off respectively in one first power output end and a second source output;
One feedback circuit, is connected to this power circuit, in order to produce a feedback signal according to this output voltage; And
One control unit, be connected to this first switching circuit and this feedback circuit, in order to control this conducting of the first switching circuit or cut-off according to the closed condition of this feedback signal and this circuit system and a running status, this power circuit is made to 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 is this closed condition, this control unit controls the out of service or intermittent operation of this first switching circuit, makes the magnitude of voltage normality of this output voltage and this first boost voltage lower than load voltage value or is zero voltage value.
12. exchange type power conversion circuits as claimed in claim 11, wherein this control unit comprises a control circuit, be connected to 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, this power circuit is made to receive the energy of this input voltage and be converted to this output voltage and this first boost voltage.
13. exchange type power conversion circuits as claimed in claim 12, wherein this feedback circuit is more connected with this circuit system, and produces this feedback signal according to a power state signal of this circuit system and this output voltage.
14. exchange type power conversion circuits as claimed in claim 13, wherein this control unit also comprises:
One start-up circuit, is connected to this circuit system and this control circuit, in order to produce a starting resistor to this control circuit according to this power state signal of this circuit system;
Wherein, when this power state signal is this closed condition, the ratio value of this feedback signal and this output voltage is one first feedback proportional value, makes this first boost voltage lower than a working voltage value, and then makes this control circuit out of service.
15. exchange type power conversion circuits as claimed in claim 14, when wherein this power state signal is this closed condition, this starting resistor is zero voltage value.
16. exchange type power conversion circuits as claimed in claim 14, when wherein this power state signal is this running status, this start-up circuit starts this control circuit by the electric energy of this starting resistor and runs, and the ratio value of this feedback signal and this output voltage is one second feedback proportional value makes this output voltage and this first boost voltage maintain load voltage value.
17. exchange type power conversion circuits as claimed in claim 12, are connected with this circuit system by an out-put supply connector.
18. exchange type power conversion circuits as claimed in claim 17, wherein this control unit also comprises a power state detection circuit, be connected to this first power output end and this control circuit of this power circuit, there is provided electric energy in order to detect this circuit system the need of this exchange type power conversion circuit, 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 for this output voltage and this first boost voltage.
19. exchange type power conversion circuits as claimed in claim 18, wherein when this out-put supply connector is connected with this circuit system, this power state detection signal is this running status; When this out-put supply connector is separated with this circuit system, this power state detection signal is this closed condition.
20. exchange type power conversion circuits as claimed in claim 19, wherein when this power state detection signal is this closed condition, this control circuit stops producing this pulse width modulation control signal constantly 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 circuits as claimed in claim 19, wherein when this power state detection signal is this closed condition, this control circuit produces this pulse width modulation control signal momently and controls this first switching circuit and run momently, and correspondence makes this output voltage and this first boost voltage rise to load voltage value momently.
22. exchange type power conversion circuits as claimed in claim 19, wherein when this power state detection signal is this closed condition, intermittently direct this second source output electric energy of this input voltage being sent to this power circuit via this control circuit of this control circuit, makes the magnitude of voltage of this first boost voltage change up and down.
23. exchange type power conversion circuits as claimed in claim 19, wherein when this power state detection signal is this closed condition, the magnitude of voltage normality of this output voltage and this first boost voltage is zero voltage value.
24. exchange type power conversion circuits as claimed in claim 19, wherein this control unit also comprises a holding circuit, be connected between this first power output end of this power circuit and this power state detection circuit, produce one second boost voltage be provided to this power state detection circuit in order to receive electric energy that this power circuit exports; Wherein, when this power state detection signal is this closed condition, this control circuit produces this pulse width modulation control signal momently and controls this first switching circuit and run momently, and to this holding circuit electric energy supplement, the magnitude of voltage of this second boost voltage is maintained and is greater than more than one second critical voltage value.
25. exchange type power conversion circuits as claimed in claim 11, also comprise:
One input rectification circuit, is connected to the power input of this power circuit, in order to this input voltage rectification; And
One input capacitance, is connected to the power input of power circuit.
26. 1 kinds of power supply units, it comprises an exchange type power conversion circuit, produce an output voltage in order to receive the electric energy of 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 receive the electric energy of this input voltage and to produce this output voltage and one first boost voltage by this first switching circuit conducting or cut-off respectively in one first power output end and a second source output;
One feedback circuit, is connected to this power circuit, in order to produce a feedback signal according to this output voltage; And
One control unit, be connected to this first switching circuit, this circuit system and this feedback circuit, in order to control this conducting of the first switching circuit or cut-off according to the closed condition of this feedback signal and this circuit system and a running status, this power circuit is made to 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 is this closed condition, this control unit controls the out of service or intermittent operation of this first switching circuit, makes the magnitude of voltage normality of this output voltage and this first boost voltage lower than load voltage value or is zero voltage value.
27. power supply units as claimed in claim 26, wherein this control unit comprises a control circuit, be connected to 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, this power circuit is made to receive the energy of this input voltage and be converted to this output voltage and this first boost voltage.
28. power supply units as claimed in claim 27, wherein this feedback circuit is more connected with this circuit system, and produces this feedback signal according to a power state signal of this circuit system and this output voltage.
29. power supply units as claimed in claim 28, wherein this control unit also comprises:
One start-up circuit, is connected to this circuit system and this control circuit, in order to produce a starting resistor to this control circuit according to this power state signal of this circuit system;
Wherein, when this power state signal is this closed condition, the ratio value of this feedback signal and this output voltage is one first feedback proportional value, makes this first boost voltage lower than a working voltage value, and then makes this control circuit out of service.
30. power supply units as claimed in claim 29, when wherein this power state signal is this closed condition, this starting resistor is zero voltage value.
31. power supply units as claimed in claim 29, when wherein this power state signal is this running status, this start-up circuit starts this control circuit by the electric energy of this starting resistor and runs, and the ratio value of this feedback signal and this output voltage is one second feedback proportional value makes this output voltage and this first boost voltage maintain load voltage value.
32. power supply units as claimed in claim 27, wherein this control unit also comprises a power state detection circuit, be connected to this first power output end and this control circuit of this power circuit, there is provided electric energy in order to detect this circuit system the need of this exchange type power conversion circuit, 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 for this output voltage and this first boost voltage.
33. power supply units as claimed in claim 32, wherein when this out-put supply connector is connected with this circuit system, this power state detection signal is this running status; When this out-put supply connector is separated with this circuit system, this power state detection signal is this closed condition.
34. power supply units as claimed in claim 33, wherein when this power state detection signal is this closed condition, this control circuit stops producing this pulse width modulation control signal constantly 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 units as claimed in claim 33, wherein when this power state detection signal is this closed condition, this control circuit produces this pulse width modulation control signal momently and controls this first switching circuit and run momently, and correspondence makes this output voltage and this first boost voltage rise to load voltage value momently.
36. power supply units as claimed in claim 33, wherein when this power state detection signal is this closed condition, intermittently direct this second source output electric energy of this input voltage being sent to this power circuit via this control circuit of this control circuit, makes the magnitude of voltage of this first boost voltage change up and down.
37. power supply units as claimed in claim 33, wherein when this power state detection signal is this closed condition, the magnitude of voltage normality of this output voltage and this first boost voltage is zero voltage value.
38. power supply units as claimed in claim 33, wherein this control unit also comprises a holding circuit, be connected between this first power output end of this power circuit and this power state detection circuit, produce one second boost voltage be provided to this power state detection circuit in order to receive electric energy that this power circuit exports; Wherein, when this power state detection signal is this closed condition, this control circuit produces this pulse width modulation control signal momently and controls this first switching circuit and run momently, and to this holding circuit electric energy supplement, the magnitude of voltage of this second boost voltage is maintained and is greater than more than one second critical voltage value.
39. power supply units as claimed in claim 26, also comprise:
One input rectification circuit, is connected to the power input of this power circuit, in order to this input voltage rectification; And
One input capacitance, is connected to the power input of power circuit.
CN201210482950.3A 2009-07-23 2009-07-23 Switching power-conversion circuit and applicable power supply unit of same Active CN102983750B (en)

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CN101207333A (en) * 2006-12-21 2008-06-25 辉芒微电子（深圳）有限公司 Switch power supply and control method with awaiting orders mode thereof
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CN1319940A (en) * 2000-01-31 2001-10-31 索尼株式会社 Switch type power source unit
CN101090238A (en) * 2006-06-16 2007-12-19 罗姆股份有限公司 Power supply device and electric appliance provided therewith
TW200824250A (en) * 2006-11-24 2008-06-01 Leadtrend Tech Corp Loading variation compensation circuit for a switching-mode power converter, and switching-mode power converter and conversion using the same
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