CN102761256A - Power supplying circuit for improving instantaneous change response, control circuit and control method of power supplying circuit - Google Patents
Power supplying circuit for improving instantaneous change response, control circuit and control method of power supplying circuit Download PDFInfo
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- CN102761256A CN102761256A CN2012102138464A CN201210213846A CN102761256A CN 102761256 A CN102761256 A CN 102761256A CN 2012102138464 A CN2012102138464 A CN 2012102138464A CN 201210213846 A CN201210213846 A CN 201210213846A CN 102761256 A CN102761256 A CN 102761256A
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Abstract
The invention relates to a power supplying circuit for improving instantaneous change response, a control circuit and a control method of the power supplying circuit. The power supplying circuit for improving instantaneous change reaction comprises a power-stage circuit, an error amplifier, an input voltage instantaneous change extraction circuit and a pulse-width modulation (PWM) comparator, wherein the power-stage switch comprises at least one power transistor switch; an input voltage is converted into an output voltage through the switching of the power transistor switch; the error amplifier is used for comparing a feedback signal associated with the output voltage with a reference signal to generate an error amplification signal; the input voltage instantaneous change extraction circuit is used for extracting the instantaneous change of the input voltage and generating a signal associated with the instantaneous change quantity; and the pulse-width modulation comparator is used for generating a pulse-width modulation signal at least according to a sawtooth wave signal, the error amplification signal and the signal associated with the instantaneous change quantity so as to control the power transistor switch in the power-stage circuit.
Description
The application be submitted on March 17th, 2009, application number be 200910128947.X, denomination of invention divides an application for the application of " improving power supply circuit and the control circuit and the method for transient variation reaction ".
Technical field
The present invention relates to a kind of power supply circuit and control circuit and method of improving transient variation reaction.
Background technology
Power supply circuit has multiple pattern, for example voltage-dropping type (Buck Converter), booster type (Boost Converter), back-pressure type (Inverter Converter), buck-boost type (Buck-Boost Converter) and return type of speeding (Fly Back Converter) or the like.Be that example is explained with the voltage-dropping type power supply circuit at first, its circuit structure is roughly as shown in Figure 1, and voltage-dropping type power supply circuit 1 includes two power transistor switch Q1, Q2,10 controls of controlled circuit; Control circuit 10 produces the Push And Release of switch controlling signal oxide-semiconductor control transistors Q1, Q2, to send electric energy to output OUT from input IN according to the feedback voltage signal FB that extracts from output.Fig. 2 marks booster type power supply circuit 2; Fig. 3 marks back-pressure type power supply circuit 3; Fig. 4 marks buck-boost type power supply circuit 4, and Fig. 5 marks and returns the type power supply circuit 5 of speeding, though above circuit circuit framework and power transistor switch number are different; But all be by control circuit 10 according to feedback voltage signal FB, and produce switch controlling signal power controlling transistor switch.(return the type power supply circuit 5 of speeding and obtain feedback voltage signal FB through optically coupled circuit 19, its details is known by present technique field personage, will not give unnecessary details.）
In the above-mentioned various prior art; The internal structure of its control circuit 10 is roughly like Fig. 6; Wherein feedback voltage signal FB and reference voltage Vref are relatively produced error and amplify signal VEA in the back by error amplifier (EA) 12, and by PWM comparator 14 with this error amplify signal VEA and sawtooth waveforms signal relatively after, the generation pulse width modulation signal; Produce the accurate position of enough driving voltages through overdrive circuit 16 again, with the grid of driving power transistor switch Q.
The shortcoming of above-mentioned prior art is, when input voltage for example when supplying power shakiness or other reason generation transient change, the reaction time of integrated circuit is rapid inadequately; This transient change must be reflected at earlier on the output voltage; Again after the delay of feedback through error amplifier EA 12, PWM comparator 14 etc.; Just react to power transistor switch Q, and after power transistor switch Q need pass through a plurality of switching cycles, could be with the output voltage balance to desired accurate position.
A kind of practice of predicting terminal point is proposed in No. 2007/0013354 case of United States Patent (USP); As shown in Figure 7; It when reference voltage Vref changes, directly adds to reference voltage Vref the output of error amplifier EA 12 in the voltage-dropping type power supply circuit; With fast reaction in advance, accelerating circuit equilibration time.This case is not to the problem that solves the input voltage transient change; Its purpose mainly is under reference voltage Vref is variable circuit framework; Circuit reaction efficiency problem when changing to the solution reference voltage Vref; Its practice can not be useful under the immutable framework of reference voltage Vref, and directly the superpose practice of reference voltage Vref of this case only can apply to the voltage-dropping type power supply circuit, and can not apply in the power supply circuit of other patterns such as booster type, back-pressure type.
In view of this, the present invention promptly to the deficiency of above-mentioned prior art, proposes a kind of power supply circuit and method of improving transient variation reaction efficient.
Summary of the invention
One of the object of the invention is to propose a kind of power supply circuit that improves transient variation reaction.
Another purpose of the present invention is to propose a kind of control circuit of power supply circuit.
A purpose more of the present invention is to propose a kind of method of improving the power supply circuit transient variation reaction.
For reaching above-mentioned purpose,, the invention provides a kind of power supply circuit that improves transient variation reaction with regard to one of them viewpoint speech; Comprise: power stage circuit; Comprise at least one power transistor switch,, and convert input voltage into output voltage through the switching of this power transistor switch; Error amplifier is compared first feedback signal relevant with output voltage with a reference signal, produce error and amplify signal; Input voltage instantaneous variation extraction circuit; Its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related, and this input voltage instantaneous variation extraction circuit comprises: first bleeder circuit, and it comprises first resistance and second resistance of series connection; And first electric capacity parallelly connected with first resistance; One end of this first resistance is electrically connected with input voltage, and the other end is electrically connected with an end of this second resistance, the other end ground connection of this second resistance; Second bleeder circuit, it comprises the 3rd resistance and the 4th resistance of series connection, and second electric capacity parallelly connected with the 4th resistance, and an end of the 3rd resistance is electrically connected with input voltage, and the other end is electrically connected with an end of the 4th resistance, the other end ground connection of the 4th resistance; And operational amplifier, its input respectively with the connected node of first resistance and second resistance, and the connected node of the 3rd resistance and the 4th resistance be electrically connected; PWM (PWM) comparator, it amplifies signal, reaches and this instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces the PWM signal, with this power transistor switch in the power controlling level circuit.
The present invention also provides a kind of power supply circuit that improves transient variation reaction, comprises: power stage circuit, comprise at least one power transistor switch, and through the switching of this power transistor switch, and convert input voltage into output voltage; Error amplifier is compared first feedback signal relevant with output voltage with a reference signal, produce error and amplify signal; Input voltage instantaneous variation extraction circuit, its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related; PWM (PWM) comparator, it amplifies signal, reaches and be somebody's turn to do and instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces the PWM signal, with this power transistor switch in the power controlling level circuit; Wherein, Also comprise the output voltage feedback circuit; Produce second feedback signal relevant with output voltage, and this PWM comparator according to said sawtooth waveforms signal, error amplify signal, with instantaneous variation amount signal related, and this second feedback signal produce said PWM signal; This second feedback signal and error amplify signal and should with this PWM comparator of input after the addition of instantaneous variation amount signal related sum.
With regard to another viewpoint speech; The invention provides a kind of control circuit of power supply circuit, this power supply circuit comprises at least one power transistor switch, through the switching of this power transistor switch; And convert input voltage into output voltage; Said control circuit comprises: error amplifier, first feedback signal relevant with output voltage compared with a reference signal, and produce error and amplify signal; Input voltage instantaneous variation extraction circuit; Its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related, and this input voltage instantaneous variation extraction circuit comprises: first bleeder circuit, and it comprises first resistance and second resistance of series connection; And first electric capacity parallelly connected with first resistance; One end of this first resistance is electrically connected with input voltage, and the other end is electrically connected with an end of this second resistance, the other end ground connection of this second resistance; Second bleeder circuit, it comprises the 3rd resistance and the 4th resistance of series connection, and second electric capacity parallelly connected with the 4th resistance, and an end of the 3rd resistance is electrically connected with input voltage, and the other end is electrically connected with an end of the 4th resistance, the other end ground connection of the 4th resistance; And operational amplifier, its input respectively with the connected node of first resistance and second resistance, and the connected node of the 3rd resistance and the 4th resistance be electrically connected; PWM (PWM) comparator, it amplifies signal, reaches and be somebody's turn to do and instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces the PWM signal, to control the power transistor switch in this power supply circuit.
Among a kind of therein embodiment; Input voltage instantaneous variation extraction circuit in this power supply circuit and this control circuit comprises: first bleeder circuit; It comprises first resistance and second resistance of series connection, and first electric capacity parallelly connected with first resistance, and an end of this first resistance is electrically connected with input voltage; The other end is electrically connected with an end of this second resistance, the other end ground connection of this second resistance; Second bleeder circuit, it comprises the 3rd resistance and the 4th resistance of series connection, and second electric capacity parallelly connected with the 4th resistance, and an end of the 3rd resistance is electrically connected with input voltage, and the other end is electrically connected with an end of the 4th resistance, the other end ground connection of the 4th resistance; And operational amplifier, its input respectively with the connected node of first resistance and second resistance, and the connected node of the 3rd resistance and the 4th resistance be electrically connected.
Just another viewpoint is sayed again; The invention provides a kind of method of improving the power supply circuit transient variation reaction, this power supply circuit comprises a power stage circuit, and this power stage circuit comprises at least one power transistor switch; Switching through this power transistor switch; And converting input voltage into output voltage, said method comprises: first feedback signal relevant with output voltage compared with a reference signal, and producing error amplifies signal; Extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related, and the step of this extraction input voltage instantaneous variation amount comprises: flashy first partial pressure value before the maintenance input voltage; Obtain input voltage second partial pressure value of present moment; And the difference that obtains first partial pressure value and second partial pressure value; Obtain a sawtooth waveforms signal; At least amplify signal, reach and this instantaneous variation amount signal related according to this sawtooth waveforms signal, this error, and produce PWM (PWM) signal; And according to this power transistor switch in this PWM signal power controlling level circuit.
In the said method, preferable the comprising of step of this extraction input voltage instantaneous variation: flashy first partial pressure value before the maintenance input voltage; Obtain input voltage second partial pressure value of present moment; And the difference that obtains first partial pressure value and second partial pressure value.And the difference of this first partial pressure value and second partial pressure value is exported after can multiply by a ratio multiple again.
The present invention provides a kind of control circuit of power supply circuit in addition; This power supply circuit comprises at least one power transistor switch; Through the switching of this power transistor switch, and convert input voltage into output voltage, said control circuit comprises: error amplifier; First feedback signal relevant with output voltage compared with a reference signal, produce error and amplify signal; Input voltage instantaneous variation extraction circuit, its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related; And the PWM comparator, it amplifies signal, reaches and this instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces pulse width modulation signal, to control the power transistor switch in this power supply circuit; Wherein, this control circuit is more obtained second feedback signal relevant with output voltage, and this second feedback signal and error are amplified signal and this and instantaneous variation amount signal related with addition after import this PWM comparator.
The present invention provides a kind of control circuit of power supply circuit again; This power supply circuit comprises at least one power transistor switch; Through the switching of this power transistor switch, and convert input voltage into output voltage, said control circuit comprises: error amplifier; First feedback signal relevant with output voltage compared with a reference signal, produce error and amplify signal; Input voltage instantaneous variation extraction circuit, its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related; And the PWM comparator, it amplifies signal, reaches and be somebody's turn to do and instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces pulse width modulation signal, to control the power transistor switch in this power supply circuit; Wherein, also comprise one drive circuit, receive this pulse width modulation signal, and the corresponding voltage quasi position of generation drives said power transistor switch.
The present invention can apply to step-down, boosts, back-pressure, buck and return in the type power supply circuit of speeding.
Explain in detail through specific embodiment below, when the effect that is easier to understand the object of the invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 to Fig. 5 illustrates voltage-dropping type, booster type, back-pressure type, the buck-boost type of prior art respectively and returns the type power supply circuit of speeding;
Fig. 6 marks the internal circuit diagram of the control circuit in Fig. 1 to Fig. 5 power supply circuit;
Fig. 7 marks the United States Patent (USP) circuit framework that No. 2007/0013354 case proposed;
Fig. 8 marks first embodiment of the present invention;
Fig. 9 A-9G marks several embodiment of power stage 28;
When Figure 10 explains the input voltage instantaneous variation, the how fast reaction of PWM signal;
Figure 11 marks an embodiment of input voltage instantaneous variation extraction circuit 21;
Figure 12 and Figure 13 mark two embodiment of the present invention.
Symbol description among the figure
1 voltage-dropping type power supply circuit
2 booster type power supply circuits
3 back-pressure type power supply circuits
4 buck-boost type power supply circuits
5 return the type power supply circuit of speeding
10 control circuits
12 error amplifiers
14 PWMs (PWM) comparator
16 drive circuits
19 optically coupled circuits
20 control circuits
21 input voltage instantaneous variation extraction circuit
23 adders
25 operational amplifiers
28 power stages
29 output voltage feedback circuits
C1, C2 electric capacity
The IN input voltage
The OUT output voltage
Q, Q1, Q2 power transistor
R1-R4 resistance
Embodiment
Please refer to Fig. 8, wherein show first embodiment of the present invention.Among the present invention; Obtain the instantaneous variation value Δ V of input voltage IN through input voltage instantaneous variation extraction circuit (Δ VK) 21; And convert into its proper proportion (K doubly, K can be any positive and negative real number, its absolute value can greater than, be equal to or less than 1) after; Directly be superimposed to the output of error amplifier EA 22, with the variation of fast reaction input voltage.
In detail; As shown in Figure 8; Comprise error amplifier (EA) 12, PWM comparator 14, drive circuit 16, input voltage instantaneous variation extraction circuit 21, power stage 28 in the power supply circuit that improves transient variation reaction of present embodiment, wherein the circuit except that power stage 28 constitutes control circuit 20.Power stage 28 is passed through the switching of its internal power transistor switch, and converts input voltage IN into output voltage OUT; It for example can be any form that is shown among (but being not limited to) Fig. 9 A-9G.When input voltage IN no change; Input voltage instantaneous variation extraction circuit 21 is output as zero; The output VEA of error amplifier 12 directly is sent to the positive input terminal of PWM comparator 14; Compare with the sawtooth waveforms signal, with generation PWM signal, and through the power transistor switch in the drive circuit 16 driving power levels 28.On the other hand; When input voltage changed, input voltage instantaneous variation extraction circuit 21 was promptly obtained the instantaneous variation value Δ V of input voltage IN, and converts K into doubly; To cooperate the relation between feedback signal FB, reference signal Vref and the output voltage OUT; Voltage (Δ VK) after this conversion is compared with the sawtooth waveforms signal in PWM comparator 14, to produce the PWM signal after amplifying signal VEA addition with error.Show among the figure that (Δ VK) and the addition of VEA reach through adder 23, this adder 23 must not comprise any circuit element, and its simple form can be merely a node.
The above is according to the operation of input voltage instantaneous variation; For example see also Figure 10; Suppose that power stage 28 is boost conversion, and the output signal of PWM comparator 14 was PWM-1 originally, when input voltage IN moment descends; Because of producing the output of (Δ VK) rapidly and be superimposed to error, amplifies on the signal VEA in input voltage instantaneous variation extraction circuit 21; Therefore PWM comparator 14 will be compared with the sawtooth waveforms signal with VEA+ (Δ VK), and its output signal will be changed into PWM-2 rapidly, in order to power stage 28 acceleration boost conversion.After input voltage IN balance, (Δ VK) promptly goes to zero, and error amplification signal VEA also will be equilibrated at new accurate position, shown in dotted line among the figure.
Input voltage instantaneous variation extraction circuit 21 has various execution modes; Lift an example and see also Figure 11; Wherein respectively input voltage IN is got dividing potential drop, and resistance R 1 is parallelly connected with C2 with capacitor C 1 respectively with resistance R 4 by resistance R 1, R2 and resistance R 3, bleeder circuit that R4 constituted.When input voltage generation instantaneous variation; Cross-pressure on the capacitor C 2 will remain flashy voltage before it; But because the coupling effect of capacitor C 1; Cross-pressure on the resistance R 2 will react the voltage for its present moment rapidly, and difference between the two is the ratio value of input voltage IN variation delta V, and this ratio value is exported after can producing suitable multiplying power via operational amplifier OP 25 computings.
According to this case inventor's experiment, when the instantaneous variation of about 50 microseconds took place input voltage IN, Fig. 6 prior art needed 60 microseconds to react approximately and arrives poised state, but the present invention promptly can arrive poised state by antedating response about about 10 microseconds.
Figure 12 shows an alternative embodiment of the invention.The difference of present embodiment and Fig. 8 embodiment is, Fig. 8 embodiment is for opening circuit controls, and present embodiment is loop circuit control.As shown in the figure, output voltage feedback circuit 29 is obtained the signal related with output voltage OUT, and feedback and the addition of sawtooth waveforms signal, its result is imported the negative input end of PWM comparator 14 again.The for example available resistor voltage divider circuit of output voltage feedback circuit 29 is reached.Figure 13 shows an alternative embodiment of the invention, and the difference of present embodiment and Figure 12 embodiment is that the output of output voltage feedback circuit 29 is to amplify signal VEA addition with error.Above Figure 12 and Figure 13 embodiment can reach the purpose of loop circuit control, and be then similar with Fig. 8 as for other circuit details, not with give unnecessary details.Certainly, among Figure 12 and Figure 13 embodiment, desire to obtain suitable results, the output of output voltage feedback circuit 29 must get correct sign again with other signal addition (or subtracting each other).
Below to preferred embodiment the present invention being described, is the above, be merely to make those skilled in the art be easy to understand content of the present invention, and be not to be used for limiting interest field of the present invention.Under same spirit of the present invention, those skilled in the art can think and various equivalence changes.For example, the input of each comparator, error amplifier, operational amplifier is positive and negative can be exchanged, and only needs the corresponding signal processing mode of revising late-class circuit to get final product.And for example, shown between direct-connected two circuit units, can insert the circuit that does not influence major function.For another example, the present invention is variable circuit framework applicable to reference voltage Vref also.More than all, and other various equivalence changes, and all should be included within the scope of the present invention.
Claims (5)
1. a power supply circuit that improves transient variation reaction is characterized in that, comprises:
Power stage circuit comprises at least one power transistor switch, through the switching of this power transistor switch, and converts input voltage into output voltage;
Error amplifier is compared first feedback signal relevant with output voltage with a reference signal, produce error and amplify signal;
Input voltage instantaneous variation extraction circuit, its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related;
The PWM comparator, it amplifies signal, reaches and be somebody's turn to do and instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces pulse width modulation signal, with this power transistor switch in the power controlling level circuit; Wherein, Also comprise the output voltage feedback circuit; Produce second feedback signal relevant with output voltage, and this PWM comparator according to said sawtooth waveforms signal, error amplify signal, with instantaneous variation amount signal related, and this second feedback signal produce said pulse width modulation signal;
This second feedback signal and error amplify signal and should with this PWM comparator of input after the addition of instantaneous variation amount signal related sum.
2. the power supply circuit that improves transient variation reaction as claimed in claim 1, wherein, this PWM comparator of input after this second feedback signal and this sawtooth waveforms signal addition.
3. the power supply circuit that improves transient variation reaction as claimed in claim 1 wherein, also comprises one drive circuit, receives this pulse width modulation signal, and the corresponding voltage quasi position of generation drives said power transistor switch.
4. the control circuit of a power supply circuit, this power supply circuit comprises at least one power transistor switch, through the switching of this power transistor switch, and converts input voltage into output voltage, it is characterized in that said control circuit comprises:
Error amplifier is compared first feedback signal relevant with output voltage with a reference signal, produce error and amplify signal;
Input voltage instantaneous variation extraction circuit, its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related; And
The PWM comparator, it amplifies signal, reaches and be somebody's turn to do and instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces pulse width modulation signal, to control the power transistor switch in this power supply circuit;
Wherein, this control circuit is more obtained second feedback signal relevant with output voltage, and with this second feedback signal with amplify signal and this and instantaneous variation amount signal related with error with addition after import this PWM comparator.
5. the control circuit of a power supply circuit, this power supply circuit comprises at least one power transistor switch, through the switching of this power transistor switch, and converts input voltage into output voltage, it is characterized in that said control circuit comprises:
Error amplifier is compared first feedback signal relevant with output voltage with a reference signal, produce error and amplify signal;
Input voltage instantaneous variation extraction circuit, its extraction input voltage instantaneous variation amount also produces and this instantaneous variation amount signal related; And
The PWM comparator, it amplifies signal, reaches and be somebody's turn to do and instantaneous variation amount signal related according to a sawtooth waveforms signal, this error at least, and produces pulse width modulation signal, to control the power transistor switch in this power supply circuit;
Wherein, also comprise one drive circuit, receive this pulse width modulation signal, and the corresponding voltage quasi position of generation drives said power transistor switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102138464A CN102761256A (en) | 2009-03-17 | 2009-03-17 | Power supplying circuit for improving instantaneous change response, control circuit and control method of power supplying circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102138464A CN102761256A (en) | 2009-03-17 | 2009-03-17 | Power supplying circuit for improving instantaneous change response, control circuit and control method of power supplying circuit |
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| CN200910128947A Division CN101841226B (en) | 2009-03-17 | 2009-03-17 | Power supply circuit for improving transient variation reaction, control circuit and method thereof |
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| CN102761256A true CN102761256A (en) | 2012-10-31 |
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| CN2012102138464A Pending CN102761256A (en) | 2009-03-17 | 2009-03-17 | Power supplying circuit for improving instantaneous change response, control circuit and control method of power supplying circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767362A (en) * | 2015-03-27 | 2015-07-08 | 绵阳豪迈电子科技有限公司 | Parking lot management system drive circuit |
| CN104868718A (en) * | 2015-05-07 | 2015-08-26 | 潍柴动力股份有限公司 | Voltage boosting circuit |
| CN112803759A (en) * | 2019-11-13 | 2021-05-14 | 奇源科技有限公司 | Power supply conversion device |
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| WO1997033213A1 (en) * | 1996-03-06 | 1997-09-12 | Litton Systems Canada Limited | Transient suppressor |
| US7019503B1 (en) * | 2005-02-07 | 2006-03-28 | Raytheon Company | Active power filter with input voltage feedforward, output load feedforward, and output voltage feedforward |
| CN1897440A (en) * | 2006-06-30 | 2007-01-17 | 北京中星微电子有限公司 | Circuit for controlling switch power supply |
| US20080084196A1 (en) * | 2006-10-04 | 2008-04-10 | Microsemi Corporation | Method and apparatus to compensate for supply voltage variations in a pwm-based voltage regulator |
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| WO1997033213A1 (en) * | 1996-03-06 | 1997-09-12 | Litton Systems Canada Limited | Transient suppressor |
| US7019503B1 (en) * | 2005-02-07 | 2006-03-28 | Raytheon Company | Active power filter with input voltage feedforward, output load feedforward, and output voltage feedforward |
| CN1897440A (en) * | 2006-06-30 | 2007-01-17 | 北京中星微电子有限公司 | Circuit for controlling switch power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767362A (en) * | 2015-03-27 | 2015-07-08 | 绵阳豪迈电子科技有限公司 | Parking lot management system drive circuit |
| CN104868718A (en) * | 2015-05-07 | 2015-08-26 | 潍柴动力股份有限公司 | Voltage boosting circuit |
| CN104868718B (en) * | 2015-05-07 | 2017-11-10 | 潍柴动力股份有限公司 | A kind of booster circuit |
| CN112803759A (en) * | 2019-11-13 | 2021-05-14 | 奇源科技有限公司 | Power supply conversion device |
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Application publication date: 20121031 |