CN2859610Y - Switching voltage stabilization device with energy-saving circuit - Google Patents

Switching voltage stabilization device with energy-saving circuit Download PDF

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Publication number
CN2859610Y
CN2859610Y CN 200520105173 CN200520105173U CN2859610Y CN 2859610 Y CN2859610 Y CN 2859610Y CN 200520105173 CN200520105173 CN 200520105173 CN 200520105173 U CN200520105173 U CN 200520105173U CN 2859610 Y CN2859610 Y CN 2859610Y
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China
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signal
order
switch
export
current
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Expired - Fee Related
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CN 200520105173
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Chinese (zh)
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杨大勇
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Fairchild Taiwan Corp
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Fairchild Taiwan Corp
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Abstract

The utility model is a switching voltage stabilization device with energy-saving circuit used for improving system effect with a light load. The first control unit outputs an oscillation signal and a power saving signal according to the change of feedback signal. The second control unit receives the feedback signal and the oscillation signal and outputs a switch signal in order to control the switch. The deadline of the switch signal increases with the reduction of load. Before the deadline of the switch signal, the power saving signal is used to end the switching switch and close the non-working circuits of the switching voltage stabilization device, which can save energy with a light-load.

Description

Switching type voltage stabilizing device with energy-saving circuit
Technical field
The utility model is switching type voltage stabilizer, power supply unit and the power supply changeover device about a kind of province energy.
Background technology
Switching type voltage stabilizer is to utilize the control switching signal, so that adjustable output voltage and electric current to be provided.Based on the demand of economizing energy, the power utilization rate in the electronic product must meet power management and economize the energy standard.
Please refer to Fig. 1, is to be an existing switching type voltage stabilizer synoptic diagram, and a switching switch Q1 is an input end VIN who is coupled to this switching type voltage stabilizer.See through a magnet assembly T1, this change-over switch Q1 delivering power is to an output terminal VO of this switching type voltage stabilizer.One auxiliary change-over switch Q2 is in order to synchronous rectification or semi-bridge type circuit framework to be provided, and this auxiliary change-over switch Q2 may be selected to be to enable or stop using.One coupler (coupler) the 50th is coupled between this output terminal VO and a control circuit 10 of this switching type voltage stabilizer, and this coupler 50 is auxiliary winding, photo-coupler or resistance of can be by transformer or the like, so that an output signal V to be provided FBThis control circuit 10 is to be coupled to this coupler 50, to receive this output signal V FB, switch signal S in order to export one W1With an auxiliary switching signal S W2, this auxiliary switching signal S W2Be to may be selected to be to enable or stop using.This switching signal S W1Be control its switch Q 1Conducting or end, in order to output terminal V at this switching type voltage stabilizer OObtain the output of a stable regulation.And should auxiliary switching signal S W2Then being used for control should auxiliary change-over switch Q 2
The main power loss of this switching type voltage stabilizer has the iron loss (core loss) of this magnet assembly T1 and the switch cost of this change-over switch Q1.When underloading, the main power loss of this switching type voltage stabilizer is to be proportional to one of this switching signal SW1 to switch frequency FS.In addition, other power loss of this switching type voltage stabilizer comes from the power attenuation of this control circuit 10.One of this switching signal SW1 switches period T S and is inversely proportional to TS=1/FS=TON+TOFF with its switching frequency FS.Wherein TON is the ON time for this switching signal SW1, and TOFF is the closing time for this switching signal SW1.By losing by increasing this switching cycle TS cpable of lowering power.Yet in order to dwindle the volume of this magnet assembly T1, this switching type voltage stabilizer still must carry out change action in a very short switching cycle TS, thereby switching frequency FS can not unrestrictedly reduce, and also must be subjected to suitably limiting.Saturated for fear of this magnet assembly T1 generation, maximum ON time TON will be restricted.Therefore, under underloading and unloaded condition, by can prolonging this switching cycle TS of switching signal SW1, and can reduce the power attenuation of this switching type voltage stabilizer by increasing closing time TOFF.Yet when this switching frequency FS reduced and falls into voiced band, this switching type voltage stabilizer may produce audio-frequency noise.
The utility model content
The purpose of this utility model is to provide a kind of switching type voltage stabilizer, power supply unit and power supply changeover device, under underloading and no-load, close partly circuit with reach province can with improve system effectiveness.
One switching type voltage stabilizer comprises one and switches switch, is sent to an output terminal of this switching type voltage stabilizer in order to power controlling.One back coupling unit is to export a feedback signal according to load state; For be issued in underloading province can with the system effectiveness of improving switching type voltage stabilizer, one first control module is can signal in order to export an oscillator signal and a province according to the change of this feedback signal.One second control module is to receive this feedback signal and this oscillator signal, comes control its switch in order to export a switching signal.Along with the reduction of load makes increase the closing time of this switching signal.Economizing signal to be the circuit that does not need work in this switching type voltage stabilizer between the off period in this switching signal in order to close, and therefore can be issued to province in underloading can effect.Before the switching frequency of this switching signal falls into voiced band, make this switching signal for stopping using, to avoid audio-frequency noise.When output load increases, make the switching frequency of this switching signal surpass voiced band, see through this feedback signal and make this switching signal for enabling.The utility model proposes switching type voltage stabilizer, under underloading and no-load, reach province's energy effect and make the power attenuation optimization, and can reduce the audio-frequency noise of this switching type voltage stabilizer with energy-saving circuit.
Description of drawings
Fig. 1 is existing switching type voltage stabilizer synoptic diagram;
Fig. 2 is the control circuit synoptic diagram of switching type voltage stabilizer of the present utility model;
Fig. 3 is the bias unit synoptic diagram of the utility model preferred embodiment of Fig. 2;
Fig. 4 is the second control module synoptic diagram of the utility model preferred embodiment of Fig. 2;
Fig. 5 is the utility model switching signal and province's energy signal waveforms of Fig. 2;
Fig. 6 is the back coupling cell schematics of the utility model preferred embodiment of Fig. 2;
Fig. 7 is the first control module synoptic diagram of the utility model preferred embodiment of Fig. 2;
Fig. 8 is the modulator synoptic diagram of the present utility model of Fig. 7.
Embodiment
With reference to figure 2, be control module 10 synoptic diagram for switching type voltage stabilizer of the present utility model.One bias unit 60 produces one first reference voltage V REF1, one second reference voltage V REF2With bias current I 0I NCooperate Fig. 1, a back coupling unit 80 sees through the output terminal V that a coupler 50 is coupled to this switching type voltage stabilizer O, to receive an output signal V FB, and export a feedback signal V according to the output load situation BOne first control module 90 is to receive this second reference voltage V REF2With this feedback signal V B, in order to export an oscillator signal PLS, a sawtooth signal V SAW, a province can signal V GWith an auxiliary control signal V S2One second control module 70 is according to this feedback signal V B, this sawtooth signal V SAW, this auxiliary control signal V S2, this province can signal V GWith this oscillator signal PLS, switch signal S in order to export one W1With an auxiliary switching signal S W2, switch switch Q to control one 1With an auxiliary change-over switch Q 2This change-over switch Q 1Be an input end V who is coupled to this switching type voltage stabilizer IN, be sent to this output terminal V of this switching type voltage stabilizer in order to power controlling O
This switching signal S W1One closing time T OFFBe to increase along with the reduction of load., this province can signal V GBe in order to close in this switching type voltage stabilizer at this switching signal S W1Closing time T OFFDo not need the circuit of work during this time, in order to be issued in underloading and no-load province can purpose.That is to say that under underloading and no-load, it is to be in standby and the state that do not need work that many circuit are arranged in this switching type voltage stabilizer.As T closing time OFFWhen extending to a certain degree, in order to meet power management and to economize the energy standard, switching type voltage stabilizer of the present utility model just begins to close the circuit that some do not need work, and power supply just is not provided, to reach the purpose of province's energy.When output load reduces switching frequency F SFall into before the voiced band, make switching signal S W1For stopping using, to avoid audio-frequency noise.When the output load increase, and make switching frequency F SWhen surpassing voiced band, by by this feedback signal V BMake this switching signal S W1Enable.In case this switching signal S W1T closing time OFFIncrease, along with the reduction of output load, this auxiliary control signal V S2Be to be used for by auxiliary change-over switch Q 2
Please refer to Fig. 3, cooperate Fig. 2, is bias unit 60 synoptic diagram for the utility model preferred embodiment.This bias unit 60 produces this first reference voltage V REF1, this second reference voltage V REF2With bias current I 0I NOne reference voltage circuit 110 is to produce this first reference voltage V REF1With this second reference voltage V REF2This first reference voltage V REF1Be to be coupled to one first voltage to current converter, this first voltage is made up of an operational amplifier 112, a resistance 113 and a transistor 114 current converter.This first voltage is to receive this first reference voltage V to current converter REF1, in order to export certain electric current I 114One first current mirroring circuit is made up of transistor 115,116,117,118,119 or the like, is to receive to decide electric current I 114, in order to the output bias electric current I 0I N, this first current mirroring circuit is for power supply each built-up circuit to this switching type voltage stabilizer is provided.Bias current I 0, I 1Be to be coupled to the circuit that all needs work under some various loads, bias current I N, I N+1Be to be coupled to the circuit that does not need work under some underloadings and the no-load.Bias current I N, I N+1Enable with stopping using and controlled by switch 123,124 or the like respectively, in order to reach the purpose of province's energy.The conducting of switch 123,124 or the like or by being can signal V by economizing GControl.Therefore, under underloading and no-load, economizing can signal V GBe electronegative potential, can close the circuit that does not need work in this switching type voltage stabilizer.
Please refer to Fig. 4, is these second control module, 70 synoptic diagram for the utility model preferred embodiment.One input end of one flip-flop 78 is coupled to a supply voltage V CC, this oscillator signal PLS is this input that is supplied to this flip-flop 78 via a phase inverter 71.One with door 79 input end be an output terminal that is coupled to this flip-flop 78 respectively, an output terminal and this province energy signal V of this phase inverter 71 GShould be to produce switching signal S with an output terminal of door 79 W1According to the drop edge (changeing electronegative potential) of this oscillator signal PLS, this switching signal S by noble potential W1Be for enabling (noble potential).Enable (noble potential) according to this oscillator signal PLS can signal V with this province GEnable (electronegative potential) make switching signal S W1Be for stopping using.One input end of one rejection gate 76 is to be coupled to this and door this output terminal of 79, should auxiliary switching signal S in order to the output terminal output at this rejection gate 76 W2Should auxiliary switching signal S W2Phase place thereby with this switching signal S W1On the contrary.Another input end of this rejection gate 76 is to be coupled to this auxiliary control signal V S2Should auxiliary switching signal S W2Be according to this auxiliary control signal V S2Enable (noble potential) and end, in order to reduce power attenuation with reach province can purpose.One negative terminal of one comparer 72 is to be coupled to this sawtooth signal V SAW, an anode of this comparer 72 is to be coupled to this feedback signal V B, in order to realize feedback loop control.One with a door input end of 73 be an output terminal that is coupled to this comparer 72, should be an output terminal that is coupled to a holding circuit 75 with another input end of door 73, should be to be coupled to one of this flip-flop 78 end of resetting with an output terminal of door 73.This holding circuit 75 has superpotential, excess current and over-temperature protection mechanism, in order to protect this switching type voltage stabilizer and its peripheral circuit.Therefore, by by holding circuit 75 or feedback signal V BCan end this switching signal S W1
Multiple with reference to figure 4, this bias current I N+1Provide power supply to this comparer 72, bias current I N+2Provide power supply to this holding circuit 75.During underloading and no-load, this province can signal V GBe electronegative potential, make this bias current I N+1With this bias current I N+2End, under underloading, do not need the circuit (as this comparer 72 and this holding circuit 75) of work to close this switching type voltage stabilizer, in order to reduce power attenuation with reach province can purpose.
Please refer to Fig. 5, is to be this switching signal S of the present utility model W1With this province energy signal V GWaveform.S W1 (F)Switching signal under the expression heavy duty, S W1 (L)Switching signal under the expression underloading.When this oscillator signal PLS enables (noble potential), this switching signal S W1Be for ending, so that to be provided the closing time that can plan.T OFF (F)Closing time under the expression heavy duty, T OFF (L)Closing time under the expression underloading.Switching signal S W1Maximum ON time T ONBe to be definite value, saturated to avoid magnet assembly to take place.
Please refer to Fig. 6, is to be single 80 synoptic diagram of this back coupling of the utility model preferred embodiment.This back coupling unit 80 comprises an error amplifier 81, and this error amplifier 81 is to be transduction (trans-conductance) amplifier, and the one anode is to be coupled to this first reference voltage V REF1, the one negative terminal is to be coupled to this to couple this output signal V of 50 FBOne resistance 82 and an electric capacity 83 are connected in series and are coupled to an output terminal COMV of this error amplifier 81, in order to as frequency compensation.Surely the gate of Bit Shift transistor 85 is coupled to this output terminal COMV of this error amplifier 81, and its source electrode is coupled to an attenuator that is composed in series by resistance 86 and 87, in order to export this feedback signal V BAs this output signal V FBBecome big, this feedback signal V BWill with diminish this bias current I 2With I N+3Provide power supply to this error amplifier 81, during underloading and no-load, this province can signal V GBe to be electronegative potential, by this bias current I N+3, in order to save the power attenuation of this error amplifier 81.
Please refer to Fig. 7, cooperate Fig. 2, is these first control module, 90 synoptic diagram for the utility model preferred embodiment.This first control module 90 comprises a modulator 100, an oscillatory circuit and an energy-saving circuit.This modulator 100 is to receive this second reference voltage V REF2With this feedback signal V B, in order to produce a discharge current I D, a underloading signal V DWith this auxiliary control signal V S2This oscillatory circuit comprises a charging current source 150, a switch 153, a switch 154, an electric capacity 155, a discharge current source 160 and an oscillation control circuit, in order to produce this oscillator signal PLS and sawtooth signal V SAWThis energy-saving circuit can be implemented by a Sheffer stroke gate 167, and this Sheffer stroke gate 167 is to receive this oscillator signal PLS and this underloading signal V D, can signal V in order to produce this province GOne second current mirroring circuit that this discharge current source 160 is made up of transistor 151 and 152 is implemented, this discharge current I DIt is an input end that is coupled to this second current mirroring circuit.This switch 153 is to be coupled between this charging current source 150 and this electric capacity 155.This switch 154 is to be coupled between the output terminal of this electric capacity 155 and this second current mirroring circuit.
This oscillation control circuit comprises a comparer 161, a comparer 162, a Sheffer stroke gate 163, a Sheffer stroke gate 164 and a phase inverter 165.This comparer 161 has a high critical voltage V H, this comparer 162 has a low critical voltage V L, this comparison 161 and 162 is to be coupled to this electric capacity 155.This comparer 161 and 162 output terminal are to be coupled to a latch circuit of being made up of this Sheffer stroke gate 163 and 164, in order to export this oscillator signal PLS.The conducting of this oscillator signal PLS gauge tap 154 or end.One input end of this phase inverter 165 is to be coupled to this oscillator signal PLS.One output terminal of this phase inverter 165 is conductings of this switch 153 of control or ends, to reach oscillation action.Along with the reduction of load makes discharge current I DReduce, and make the enabling time of this oscillator signal PLS increase.In case load is lower than a critical value, this underloading signal V DBe for enabling.According to this underloading signal V DWith enabling of this oscillator signal PLS, can signal V in order to produce this province GThe charging current I that this charging current source 150 is provided ADetermine this switching signal S with a capacitance of this electric capacity 155 W1Maximum ON time T ONThis discharge current I DWith this electric capacity 155 this switching signal of decision S W1T closing time OFFThis charging current I ABe to be the definite value electric current, this discharge current I DIt is the change that is directly proportional according to the variation of load.
With reference to figure 8, be these modulator 100 synoptic diagram for the utility model preferred embodiment.This modulator 100 comprises one second voltage to current converter, one the 3rd current mirroring circuit, one the 4th current mirroring circuit, one the 5th current mirroring circuit, an impact damper 205, an inverter buffer 207 and a phase inverter 206.This second voltage is made up of a transistor 185, a resistance 183, an operational amplifier 181 and an operational amplifier 182 current converter, and wherein this operational amplifier 182 is to be coupled to this feedback signal V B, this operational amplifier 181 is to be coupled to this second reference voltage V REF2This second voltage produces an electric current I to current converter 185When load reduces, make output signal V FBIncrease also causes feedback signal V BReduce, in case feedback signal V BBe lower than the second reference voltage V REF2, along with feedback signal V BMinimizing make this electric current I 185Increase.The 3rd current mirroring circuit is made up of transistor 186 and 187, and the 3rd current mirroring circuit is to be coupled to this electric current I 185, in order to export an electric current I 187One constant current source is by bias current I 1Supply, this constant current source is an input end that is coupled to the 4th current mirroring circuit, the 4th current mirroring circuit is made up of 188,189,190 and 196 in transistor, in order to produce an electric current I respectively 189, an electric current I 190With an electric current I 196The 5th current mirroring circuit is made up of transistor 191,192,193,194 and 195, and an input end of the 5th current mirroring circuit is to be coupled between a drain of a drain of this transistor 187 and this transistor 189 to draw this electric current I 187With electric current I 189A spill current I 191, a drain that is used to this transistor 192 produces an electric current I 192, produce an electric current I in a drain of this transistor 193 193, produce an electric current I in a drain of this transistor 194 194Produce an electric current I with a drain in this transistor 195 195Wherein this drain of this transistor 192 is that this drain with this transistor 190 couples, and this drain of this transistor 193 is that the drain with this transistor 196 couples.One input end of this inverter buffer 207 is to be coupled between the drain of a drain of this transistor 193 and this transistor 196.When this electric current I 192Less than this electric current I 190The time, its voltage of an input end of this impact damper 205 will be low level, this phase inverter 206 will receive this low level voltage and export a high levle underloading signal V D, economize energy signal V in order to export a low level G, the circuit that part must not act under underloading is turned off to save the energy.When this electric current I 193Less than this electric current I 196The time, its voltage of an input end of inverter buffer 207 is to be low level, so an output terminal of this inverter buffer 207 produces this auxiliary control signal V of a high levle S2, thereby make this auxiliary switching signal S W2For stopping using, close this auxiliary switch Q 2One switch 201 is to be coupled between this input end of a drain of this transistor 194 and this impact damper 205.One switch 202 is to be coupled to a drain of this transistor 195 in order to this discharge current I to be provided D, this discharge current I wherein DBe by this electric current I 195Institute provides.
One output terminal of this buffer circuit 205 is controlled the conducting of this switch 201 and 202 or is ended.This phase inverter 206 is these output terminals that are coupled to this buffer circuit 205, in order to export this underloading signal V DThis underloading signal V DCritical accurate position be for adjustable, in order to avoid audio-frequency noise.This discharge current I DDetermine this switching signal S W1Switching frequency.As this switching signal S W1Switching frequency when falling into voiced band, switch 202 is for ending, thereby this discharge current I that stops using DWith this switching signal S W1, to avoid audio-frequency noise.In case load increases, and makes this switching signal S W1Switching frequency when surpassing voiced band, by by this feedback signal V BMake this switch 202 conductings, in order to enable this discharge current I D

Claims (8)

1. the switching type voltage stabilizing device with energy-saving circuit is characterized in that, includes:
One switches switch, is coupled to an input end of this switching type voltage stabilizing device, is sent to an output terminal of this switching type voltage stabilizing device in order to power controlling;
One feedbacks the unit, is coupled to this output terminal of this switching type voltage stabilizing device, is in order to export a feedback signal according to loading condition;
One first control module is to receive this feedback signal, in order to export an oscillator signal and province energy signal; And
One second control module is to receive this feedback signal and this oscillator signal, switches signal in order to export one, to control this change-over switch; Wherein be to increase according to the reduction of load the closing time of this switching signal; Between the off period of switching signal, this province's energy signal is closed the partial circuit of this switching type voltage stabilizing device under underloading and no-load.
2. switching type voltage stabilizing device as claimed in claim 1 is characterized in that, described this first control module includes:
One modulator is to receive this feedback signal, in order to export a discharge current and a underloading signal;
One oscillatory circuit comprises a charging current source, a discharge current source, a charge switch, a discharge switch, an electric capacity and an oscillation control circuit, in order to export this oscillator signal; Wherein this discharge current source is that this discharge current of mirror is in order to discharge to this electric capacity;
One energy-saving circuit is to receive this oscillator signal and this underloading signal, in order to export this province's energy signal; Wherein this discharge current is to reduce according to the reduction of load; According to the minimizing of this discharge current, the enabling time of this oscillator signal is for increasing; In case load is lower than a critical value, this underloading signal is for enabling, and according to enabling of this underloading signal and this oscillator signal, this energy-saving circuit is that this province of output can signal.
3. this switching type voltage stabilizing device as claimed in claim 2 is characterized in that, described this modulator comprises:
One first operational amplifier is to receive this feedback signal;
One second operational amplifier is coupled to a critical voltage;
One voltage is to current converter, and it is made up of a transistor, a resistance, this first operational amplifier and this second operational amplifier, in order to export one first electric current; When this feedback signal is lower than this critical voltage, according to the minimizing of this feedback signal, this first electric current is for increasing;
One first current mirroring circuit is to receive this first electric current, in order to export one second electric current;
One constant current source;
One second current mirroring circuit is coupled to this constant current source, in order to produce one the 3rd electric current and one the 4th electric current;
One the 3rd current mirroring circuit is coupled to this first current mirroring circuit and this second current mirroring circuit, and the 3rd current mirroring circuit is the difference that receives this second electric current and the 3rd electric current, in order to export one the 5th electric current, one the 6th electric current and one the 7th electric current;
One first switch, one first end is supplied by the 6th electric current;
One second switch, one first end is supplied by the 7th electric current, and one second end is in order to export this discharge current;
One buffer circuit, one input end are one second ends that receives the difference electric current while of the 5th electric current and the 4th electric current and be coupled to this first switch; The one output terminal is the conducting of this first switch of control and this second switch or ends; And
One phase inverter is coupled to this output terminal of this buffer circuit, in order to export this underloading signal.
4. this switching type voltage stabilizing device as claimed in claim 1 is characterized in that, further comprises: an auxiliary change-over switch is coupled to this change-over switch.
5. this switching type voltage stabilizing device as claimed in claim 1 is characterized in that, is buck-converter, direction flyback converter or half-bridge power supply unit topology framework.
6. the switching type voltage stabilizing device with energy-saving circuit is characterized in that, includes:
One feedbacks the unit, is coupled to the load of this power supply changeover device, and according to the change of load in order to export a feedback signal;
One first control module is to receive this feedback signal, in order to output one province energy signal under the underloading condition; And
One second control module is to receive this feedback signal, comes power controlling to be sent to the load of this power supply changeover device in order to export a switching signal; Wherein this province can signal be to transmit in order to end power, and closes the partial circuit of this power supply changeover device.
7. switching type voltage stabilizing device as claimed in claim 6 is characterized in that, described this switching signal is to switch switch in order to control one, and this change-over switch is coupled to an input end of this power supply changeover device.
8. switching type voltage stabilizing device as claimed in claim 6 is characterized in that, described this first control module includes:
One modulator is to receive this feedback signal, in order to export a underloading signal;
One oscillatory circuit comprises a charging current source, and puts discharge current source, a charge switch, a discharge switch, an electric capacity and an oscillation control circuit, in order to export an oscillator signal; And
One energy-saving circuit is to receive this oscillator signal and this underloading signal, in order to export this province's energy signal; Wherein when load was lower than a critical value, this underloading signal was for enabling, and according to enabling of this underloading signal and this oscillator signal, and output economizes the energy signal.
CN 200520105173 2005-08-23 2005-08-23 Switching voltage stabilization device with energy-saving circuit Expired - Fee Related CN2859610Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200520105173 CN2859610Y (en) 2005-08-23 2005-08-23 Switching voltage stabilization device with energy-saving circuit

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Application Number Priority Date Filing Date Title
CN 200520105173 CN2859610Y (en) 2005-08-23 2005-08-23 Switching voltage stabilization device with energy-saving circuit

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CN2859610Y true CN2859610Y (en) 2007-01-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1920726B (en) * 2005-08-23 2010-11-03 崇贸科技股份有限公司 Switching mode voltage-regulated device with energy-saving circuit and energy-saving control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1920726B (en) * 2005-08-23 2010-11-03 崇贸科技股份有限公司 Switching mode voltage-regulated device with energy-saving circuit and energy-saving control method

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