CN101888166A - Power conversion method and device with adjustable pulse width control - Google Patents
Power conversion method and device with adjustable pulse width control Download PDFInfo
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Abstract
一种可调适脉宽控制的电源转换方法及装置，其中所述装置包括一可调适脉宽PFM控制电路、一PWM控制电路、一PWM/PFM切换单元、一开关电路及一负载状态检测电路，是在由PWM模式切换操作为PFM模式前，以一预定的脉宽递增级数，循序由低至高逐级调节一序列的PFM控制信号的脉宽至一最适脉宽值后，再以PFM模式供应输出电压至负载，以改善PFM模式时的输出电压波形，使电源转换装置的输出稳定度较佳。
A power conversion method and device with adjustable pulse width control, wherein the device includes an adjustable pulse width PFM control circuit, a PWM control circuit, a PWM/PFM switching unit, a switch circuit and a load state detection circuit. Before switching from PWM mode to PFM mode, the pulse width of a sequence of PFM control signals is adjusted step by step from low to high with a predetermined pulse width increment level to an optimal pulse width value, and then the output voltage is supplied to the load in the PFM mode to improve the output voltage waveform in the PFM mode, so that the output stability of the power conversion device is better.
Description
Technical field
The invention relates to a kind of design of power supply change-over device, particularly power conversion method and the device of controlling about a kind of adjustable pulse width.
Background technology
In increasingly sophisticated electronics, computer system device, power supply change-over device has been played the part of a very important role.Consult shown in Figure 1ly, it is the control circuit figure that shows the known power source conversion equipment.Known power source conversion equipment 100 is mainly produced the pulse control signal Pout1 control switch circuit 2 of a sequence by a control logic circuit 1, make semiconductor element (for example MOSFET) conducting in the switching circuit 2 or close, by a filter circuit 21 input voltage source Vin is converted to the required output voltage V out1 of load 3 again.
Except PWM control, power supply change-over device also often adopts pulse frequency modulation, and (Pulse FrequencyModulation, PFM) Kong Zhi mode is carried out power source conversion.The characteristic of PFM control is to control at the switching frequency of switching circuit, and the switching frequency of switching circuit is adjusted according to the difference or the load size of changeing pressure reduction (Voltage ConversionRatio).During at less commentaries on classics pressure reduction and than heavy load, the switching frequency of switching circuit can be heightened, and when bigger commentaries on classics pressure reduction and less load, the switching circuit switching frequency can be turned down.But no matter PFM control changes pressure reduction, load size, outer member (for example: inductance L, capacitor C) size for PWM control, the pulsewidth of its pulse control signal is fixed value.
Generally speaking, power supply change-over device is as operating with PFM, and the efficient of power source conversion is higher when underloading.Because in the loss of switch power switched is under the situation of certain value, the loss of switch power switched is inversely proportional to the load size to the ratio of power output, power loss is mostly in the switching of switching circuit during underloading, so can reduce the switch switching frequency when the underloading with PFM operation, thereby reduce the loss of switch power switched, so comparatively speaking, efficient can be high more many than the PWM operation when operating in underloading with PFM, and is low relatively more with PWM operation meeting conversion efficiency when load is light more.So the exemplary of power supply change-over device mode of operation now is in conjunction with PWM and PFM, and when underloading, turn to the PFM pattern from the PWM pattern, and inductive current iL11, output voltage V out11 and the pulse control signal Pout11 of the power supply change-over device of this type under the PWM pattern, and inductive current iL12, output voltage V out12 under the PFM pattern and pulse control signal Pout12, its waveform is shown by Fig. 2 and Fig. 3 respectively.
Yet, the known power supply change-over device that when underloading, turns to the PFM pattern from the PWM pattern, change pressure reduction, load size, outer member (inductance, electric capacity) size owing to ignore when working in the PFM pattern, the pulsewidth of its pulse control signal is fixed value, so when the PFM pattern, it is big that output voltage waveforms (consulting Fig. 3) comparatively speaking can the output voltage waveforms (consulting Fig. 2) when being operated in the PWM pattern comes, and output voltage waveforms also can become big with changeing the pressure reduction increase, becomes the power supply change-over device problem place of this type.
Summary of the invention
Purpose of the present invention promptly provides a kind of power conversion method and device of adjustable pulse width control, and the output voltage waveforms during in order to reduction PFM pattern makes output stability preferable.
The present invention is when detecting a mode switch event signal for the technological means that problem adopted that solves known technology, produce the PFM control signal of a sequence with a predetermined pulse width, and the pulsewidth of comparison PFM control signal and pwm control signal, pulsewidth the greater is output as a pulse control signal, in order to the control switch circuit, export an output voltage by filter circuit again and be supplied to load.The pulsewidth of this PFM control signal is according to a predetermined pulsewidth increasing series, regulate step by step from low to high in proper order, and the feedback states signal of the foundation load that detects, the pulsewidth of adjusting the PFM control signal is supplied output voltage to this load with the PFM pattern to the suitableeest pwm value.
Circuit of the present invention comprises adjustable pulse width PFM control circuit in order to the PFM control signal that produces a sequence, in order to the pwm control circuit of the pwm control signal that produces a sequence, be connected in PWM/PFM switch unit between adjustable pulse width PFM control circuit and pwm control circuit, connect the switching circuit of input voltage source and adjustable pulse width PFM control circuit and the load condition testing circuit that detects the feedback states signal of load.
The technology used in the present invention means, by making power supply change-over device before entering the work of PFM pattern by the PWM pattern, cooperate different commentaries on classics pressure reduction and outer member, inductive current, output voltage according to load ... wait the feedback states signal, the pulsewidth of PFM control signal is adapted to the suitableeest pulsewidth, when making power supply change-over device be operated in the PFM pattern, the waveform of its output voltage improves, can not make output voltage waveforms become big because of changeing the pressure reduction increase yet, reduce the loss of switch power switched, make output stability preferable.
Description of drawings
Fig. 1 is the control circuit figure that shows the known power source conversion equipment;
Fig. 2 shows when the known power source conversion equipment operates in the PWM pattern oscillogram of each circuit signal;
Fig. 3 shows when the known power source conversion equipment operates in the PFM pattern oscillogram of each circuit signal;
Fig. 4 is the control circuit figure that shows preferred embodiment of the present invention;
Fig. 5 is the control circuit figure that shows preferred embodiment adjustable pulse width PFM control circuit of the present invention;
Fig. 6 is the oscillogram that shows each circuit signal of the present invention;
Fig. 7 is the flow chart of steps that shows preferred embodiment of the present invention;
Fig. 8 shows the present invention when the PWM pattern, the oscillogram of each circuit signal;
Fig. 9 shows the present invention when the PFM pattern, the oscillogram of each circuit signal.
Drawing reference numeral
100 known power source conversion equipments
The power supply change-over device of 100a adjustable pulse width control
1 control logic circuit
11 adjustable pulse width PFM control circuits
111 control logic unit
112 memory cell
113 counters
114 digital/analog converters
115 pulse generators
116 pulsewidth comparison circuits
12 pwm control circuits
13 PWM/PFM switch units
2 switching circuits
21 filter circuits
3 loads
41 inductive current detection circuits
42 error amplifying circuits
43 comparators
5 load condition testing circuits
51 inductive current detection circuits
52 feedback circuits
53 error amplifying circuits
54 phase compensating circuits
55 error comparison circuits
C electric capacity
The CLK clock signal
The discontinuous current-mode signal of DCM
Enable mode switch event signal
Ecout feedback states signal
The Fb feedback signal
IL1, iL11, iL12, iL2, inductive current
iL21、iL22
The L inductance
M1 PWM pattern
M2 PFM pattern
The M3 transition stage
N revises the multiplying power parameter
PFM_Enable PFM mode switch event signal
Pout1, Pout11, Pout12, pulse control signal
Pout2、Pout21、Pout22
The PWM0 pwm control signal
PWMF PFM control signal
The Vin input voltage source
Vout1, Vout11, Vout12, output voltage
Vout2、Vout21、Vout22
The Vref reference voltage
The Vs slope compensation
The initial pwm value of W
DW pulsewidth increasing series
Embodiment
Specific embodiment of the present invention will be further described by following embodiment and accompanying drawing.
Please consult Fig. 4 and Fig. 5 simultaneously, the control circuit of the power supply change-over device 100a of adjustable pulse width control of the present invention comprises an adjustable pulse width PFM control circuit 11, a pwm control circuit 12, a PWM/PFM switch unit 13, a switching circuit 2 and a load condition testing circuit 5.
Adjustable pulse width PFM control circuit 11 is connected in pwm control circuit 12 by a PWM/PFM switch unit 13.Shown in Figure 5, adjustable pulse width PFM control circuit 11 mainly comprises a control logic unit 111, it is connected with a memory cell 112, store an initial pwm value W, a pulsewidth increasing series dW and one in the memory cell 112 and revise the multiplying power parameter N, make control logic unit 111 in order to produce PFM control signal PWMF to the pulsewidth comparison circuit 116 of a sequence in regular turn by a counter 113, a digital/analog converter 114 controls one pulse generator 115.It will be appreciated by those skilled in the art that and utilize counter 113 to produce PFM control signal PWMF, can be implemented by other modes naturally during practical application only for better embodiment of the present invention.
Switching circuit 2 connects input voltage source Vin and adjustable pulse width PFM control circuit 11, by pulse control signal Pout2 control switch circuit 2, is supplied to load 3 by a filter circuit 21 outputs one output voltage V out2 again.
Load condition testing circuit 5 can detect voltage and the current status that is supplied to load 3, and produces a feedback states signal Ecout and be transmitted back to pwm control circuit 12 and PWM/PFM switch unit 13.In the present embodiment, load condition testing circuit 5 comprises an inductive current detection circuit 51, a feedback circuit 52, an error amplifying circuit 53, a phase compensating circuit 54 and an error comparison circuit 55.
Inductive current detection circuit 51 is connected between switching circuit 2 and the filter circuit 21, is supplied in the inductive current iL2 of load 3 in order to detection; Feedback circuit 52 is connected between filter circuit 21 and the load 3, is supplied in the output voltage V out2 of load 3 in order to detection; A wherein input of error amplifying circuit 53 provides a reference voltage Vref, another input is connected in feedback circuit 52, output then is connected in the input of error comparison circuit 55 by phase compensating circuit 54, and another input of error comparison circuit 55 is connected in inductive current detection circuit 51, and output then exports pwm control circuit 12 to and exports adjustable pulse width PFM control circuit 11 to by PWM/PFM switch unit 13.
Consult shown in Figure 6 simultaneously, it is the oscillogram of each circuit signal of the present invention, includes the oscillogram of pwm control signal PWM0, PFM control signal PWMF, pulse control signal Pout2, clock signal clk, mode switch event signal Enable, PFM mode switch event signal PFM_Enable, discontinuous current-mode signal DCM, each signal of inductive current iL2.Variation when showing that each signal enters PFM pattern M2 by PWM pattern M1.
Fig. 7 shows the flow chart of steps of preferred embodiment of the present invention, and please cooperate Fig. 4 to Fig. 6, the steps flow chart of preferred embodiment of the present invention is done one be described as follows.A changeable PWM pattern M1 or the PFM pattern M2 of operating in of power supply change-over device 100a of adjustable pulse width control of the present invention, before the power supply change-over device 100a of adjustable pulse width control is PFM pattern M2 by PWM pattern M1 handover operation, can adjust the suitableeest pwm value of pulsewidth to of PFM control signal PWMF in a transition stage M3.
When actual operation, at first judge whether to detect a mode switch event signal Enable (step 101) by adjustable pulse width PFM control circuit 11, mode switch event signal Enable judges during for underloading in load 3 to produce.Affiliated technical field technical staff is to be understood that, underloading can be utilized and detect electric current, voltage, the pulsewidth of pulse control signal, frequency ... etc. variety of way in order to do the judgement of underloading, this mode switch event signal Enable then can be produced by outside or internal control.When load on ordinary circumstance (for example: in carry, heavy duty) time, then the power supply change-over device 100a of adjustable pulse width control operates in PWM pattern M1 (step 102), by pwm control circuit 12 according to the required output voltage V out2 of input voltage source Vin and load 3, produce the pwm control signal PWM0 of a sequence, export as pulse control signal Pout2.
When detecting mode switch event signal Enable, also be load when transferring underloading to, it is PFM pattern M2 that the power supply change-over device 100a of adjustable pulse width control prepares by PWM pattern M1 handover operation.At this moment, set initial pwm value W and the pulsewidth increasing series dW (step 103) of PFM control signal PWMF by adjustable pulse width PFM control circuit 11.In the present embodiment, initial pwm value W and pulsewidth increasing series dW are stored in the memory cell 112 in advance, certainly, can be implemented to set by outside input or other known technology means.
At the same time, PWM control unit 12 is still with the pwm control signal PWM0 input adjustable pulse width PFM control circuit 11 that is produced, the control logic unit 111 of adjustable pulse width PFM control circuit 11 is according to initial pwm value W, produce the PFM control signal PWMF (step 104) of a sequence by pulse generator, PFM control signal PWMF triggers with pwm control signal PWM0 leading edge, make itself and pwm control signal PWM0 synchronous, input pulsewidth comparison circuit 116.
Behind PFM control signal PWMF and the pwm control signal PWM0 input pulsewidth comparison circuit 116, by pulsewidth comparison circuit 116 pulsewidth (step 105) of PFM control signal PWMF and pwm control signal PWM0 relatively, and pulsewidth the greater of PFM control signal PWMF and pwm control signal PWM0 is output as pulse control signal Pout2 (step 106).Is thin portion flow process on it is implemented to judge earlier the pulsewidth of the pulsewidth of PFM control signal PWMF greater than pwm control signal PWM0? (step 106a).When the pulsewidth of PFM control signal PWMF is big, then PFM control signal PWMF is output as pulse control signal Pout2 (step 106b); When the pulsewidth of pwm control signal PWM0 is big, then pwm control signal PWM0 is output as pulse control signal Pout2 (step 106c).Though in preferred embodiment of the present invention, be in order to output pulse control signal Pout2 by above-mentioned steps, but also changing with pwm control signal PWM0, constantly expand, still can on output pulse control signal Pout2, be effective with certain increment value as benchmark.
Adjustable pulse width PFM control circuit 11 is supplied to load 3 (step 107) by filter circuit 21 output output voltage V out2 again with the pulse control signal Pout2 control switch circuit 2 of output.Promptly detected load 3 this moment by load condition testing circuit 5 feedback states signal Ecout (step 108) passes adjustable pulse width PFM control circuit 11 and pwm control circuit 12 back.In the present embodiment, feedback states signal Ecout mainly comprises inductive current iL2 and the output voltage V out2 that is supplied in load 3.
The feedback states signal Ecout that is passed back by load condition testing circuit 5 is the usefulness of adjusting as the pulsewidth of PFM control signal PWMF and pwm control signal PWM0, as shown in Figure 6, PWM control unit 12 reduces the pulsewidth of pwm control signal PWM0 gradually according to feedback states signal Ecout when load transfers underloading to.The pulsewidth increasing series dW that adjustable pulse width PFM control circuit 11 is set according to preceding elder generation, the pulsewidth of regulating PFM control signal PWMF in proper order from low to high step by step, and, determine the suitableeest pwm value (step 109) according to feedback states signal Ecout.In the implementing procedure of thin portion, do you earlier judge that the pulsewidth of PFM control signal PWMF arrives the suitableeest pwm value? (step 109a), if the pulsewidth of PFM control signal PWMF is the suitableeest pwm value of no show still, 111 pulsewidths (step 109b) of regulating PFM control signal PWMF according to pulsewidth increasing series dW in proper order from low to high step by step in control logic unit, make the pulsewidth of PFM control signal PWMF switch and constantly increase progressively with clock signal clk, by the circulation process that repeats to export, detect, regulate, till arriving the suitableeest pwm value.
Whether the pulsewidth of PFM control signal PWMF arrives the suitableeest pwm value, can be by detecting inductive current iL2, output voltage V out2, the variation of load 3 is judged, can comprise following several method in the enforcement: (1) is detected and whether is supplied in the inductive current of load by discontinuous current-mode (Discontinuous CurrentMode, DCM) change into continuous current pattern (Continuous Current Mode, CCM), when detection time point can be the clock signal clk end cycle or 1/10～1 clock signal clk cycle, the twice of judging the electric current when electric current also can be for the continuous current pattern is to zero; (2) detect the output voltage waveforms output voltage waveforms when being operated in discontinuous current-mode and continuous current pattern and having a common boundary whether be supplied in load; (3) detect the inductive current mean value inductive current mean value when being operated in discontinuous current-mode and continuous current pattern and having a common boundary whether be supplied in load.So, along with the difference of changeing pressure reduction, the difference of outer member, can calculate the suitableeest suitable separately pwm value.
After calculating the suitableeest pwm value, still can regulate the suitableeest pwm value (step 110) with a predetermined correction multiplying power parameter N, the suitableeest pwm value is increased or reduces in response to the considering of different loads and circuit.If the suitableeest pwm value is increased, then can increase output voltage waveforms, and promote efficient; The suitableeest pwm value is dwindled, then can reduce output voltage waveforms, and lower efficiency.After the suitableeest pwm value decision, then lock this suitableeest pwm value, and send PFM mode switch event signal PFM_Enable by adjustable pulse width PFM control circuit 11 and give PWM/PFM switch unit 13, switch to the PFM pattern.After this then to adjust the suitableeest pwm value after the pulsewidth, to load 3 (step 111), feedback states signal Ecout is as the usefulness of the arteries and veins frequency of regulating PFM control signal PWMF with PFM pattern M2 supply output voltage V out2.
Consult Fig. 8 and shown in Figure 9, Fig. 8 shows inductive current iL21, the output voltage V out21 of the present invention under the PWM pattern and the oscillogram of pulse control signal Pout21; Fig. 9 shows inductive current iL22, the output voltage V out22 of the present invention under the PFM pattern and the oscillogram of pulse control signal Pout22.The present invention compares with known technology (please cooperate and consult Fig. 2 and Fig. 3), because before entering the PFM pattern, carrying out the pulsewidth of PFM control signal PWMF adjusts, make it have the suitableeest pwm value, so when the PFM pattern, output voltage V out22 waveform not can than the output voltage V out21 waveform when the PWM pattern come big, improve the disappearance of known technology.
By above embodiment as can be known, the power conversion method of adjustable pulse width provided by the present invention control and install value on the true tool industry was so the present invention had accorded with the requirement of patent already.But above narration only is preferred embodiment explanation of the present invention, and any those skilled in the art can do other all improvement according to above-mentioned explanation, but these changes still belong in invention spirit of the present invention and above claims that defined.
Claims (12)
1. the power conversion method of adjustable pulse width control, it is characterized in that, described power conversion method is to be converted to the output voltage that is supplied to a load in order to the power-switching circuit that an input voltage source is controlled by an adjustable pulse width, described power-switching circuit is changeable to be operated in-a PFM pattern or a PWM pattern, and described method comprises the following steps:
(a) detect a mode switch event signal;
(b) when detecting described mode switch event signal, produce the PFM control signal of a sequence by described power-switching circuit with a predetermined pulse width, in order to export a pulse control signal;
(c) control described switching circuit by described pulse control signal, export an output voltage by described filter circuit again and be supplied to described load;
(d) the feedback states signal of the described load of detection;
(e), regulate the pulsewidth of described PFM control signal in proper order from low to high step by step, and, determine the suitableeest pwm value according to described feedback states signal according to a predetermined pulsewidth increasing series;
(f) with described the suitableeest pwm value of adjusting after the pulsewidth, with PFM pattern supply output voltage to described load.
2. the power conversion method of adjustable pulse width as claimed in claim 1 control is characterized in that, in the step (a), described mode switch event signal is to produce during for underloading in described load.
3. the power conversion method of adjustable pulse width control as claimed in claim 1 is characterized in that, in the step (e), is whether to change into the continuous current pattern by discontinuous current-mode according to the inductive current that is supplied in described load, determines the suitableeest described pwm value.
4. the power conversion method of adjustable pulse width control as claimed in claim 1, it is characterized in that, in the step (e), be according to the output voltage waveforms that is supplied in described load output voltage waveforms when being operated in discontinuous current-mode and continuous current pattern and having a common boundary whether, determine the suitableeest described pwm value.
5. the power conversion method of adjustable pulse width control as claimed in claim 1, it is characterized in that, in the step (e), be according to the inductive current mean value that the is supplied in described load inductive current mean value when being operated in discontinuous current-mode and continuous current pattern and having a common boundary whether, determine the suitableeest described pwm value.
6. the power conversion method of adjustable pulse width control as claimed in claim 1 is characterized in that, step (e) also comprises afterwards with the predetermined correction multiplying power parameter regulation the suitableeest described pwm value.
7. the power conversion method of adjustable pulse width control as claimed in claim 1 is characterized in that step (b) also comprises the following steps: afterwards
(b1) pulsewidth of more described PFM control signal and the pwm control signal that described power-switching circuit produced;
(b2) the pulsewidth the greater with described PFM control signal and described pwm control signal is output as described pulse control signal.
8. the power supply change-over device of adjustable pulse width control is characterized in that described power supply change-over device comprises in order to an input voltage source is supplied to a load after power source conversion:
One adjustable pulse width PFM control circuit is in order to produce the PFM control signal of a sequence;
One pwm control circuit is in order to produce the pwm control signal of a sequence;
One PWM/PFM switch unit connects described adjustable pulse width PFM control circuit and described pwm control circuit;
One switching circuit, connect described input voltage source and described adjustable pulse width PFM control circuit, be output as a pulse control signal by one of described PFM control signal and described pwm control signal and control described switching circuit, export an output voltage by a filter circuit again and be supplied to described load;
One load condition testing circuit in order to detect the feedback states signal of described load, is transmitted back to described adjustable pulse width PFM control circuit and described pwm control circuit;
Before described power supply change-over device is operating as the PFM pattern by the PWM mode switch, produce the PFM control signal of a sequence with a predetermined pulse width by described adjustable pulse width PFM control circuit, and with a predetermined pulsewidth increasing series, regulate the pulsewidth of described PFM control signal in proper order from low to high step by step, until the described feedback states signal of foundation, after determining the suitableeest pwm value, again with described the suitableeest pwm value of adjusting after the pulsewidth, with PFM pattern supply output voltage to described load.
9. the power supply change-over device of adjustable pulse width control as claimed in claim 8 is characterized in that described adjustable pulse width PFM control circuit comprises:
One control unit;
One memory cell connects described control unit, stores described pulsewidth increasing series in the described memory cell;
One pulse generator connects described control unit, under the control of described control unit, produces described PFM control signal;
One pulsewidth comparison circuit is connected in described pulse generator, is output as described pulse control signal in order to the pulsewidth the greater with described PFM control signal and described pwm control signal.
10. the power supply change-over device of adjustable pulse width control as claimed in claim 9, it is characterized in that, described adjustable pulse width PFM control circuit also comprises a counter and a digital/analog converter, described counter connects described control unit, described digital/analog converter connects described counter, and described control unit is controlled described pulse generator by described counter and described digital/analog converter.
11. the power supply change-over device of adjustable pulse width control as claimed in claim 8, it is characterized in that, described load condition testing circuit comprises an inductive current detection circuit, is connected between described switching circuit and the described filter circuit, is supplied in the inductive current of described load in order to detection.
12. the power supply change-over device of adjustable pulse width control as claimed in claim 8, it is characterized in that, described load condition testing circuit comprises a feedback circuit, is connected between described filter circuit and the described load, is supplied in the output voltage of described load in order to detection.
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| DE60029800T2 (en) * | 2000-12-05 | 2007-02-22 | Infineon Technologies Ag | Frequency limiting and overload detection in a voltage regulator |
| JP3994942B2 (en) * | 2003-07-24 | 2007-10-24 | ソニー株式会社 | Power supply circuit and electronic equipment |
| TWI371672B (en) * | 2004-08-30 | 2012-09-01 | Monolithic Power Systems Inc | Voltage regulation system |
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| CN103312163A (en) * | 2012-03-13 | 2013-09-18 | 上海华虹集成电路有限责任公司 | PFM (Pulse Frequency Modulation) switching circuit of switch power supply |
| CN103312163B (en) * | 2012-03-13 | 2016-11-23 | 上海华虹集成电路有限责任公司 | The PFM switching circuit of Switching Power Supply |
| CN104052277B (en) * | 2013-03-15 | 2018-07-10 | 马克西姆综合产品公司 | The system and method for controlling DC/DC multiphase switching regulaors |
| CN104052277A (en) * | 2013-03-15 | 2014-09-17 | 马克西姆综合产品公司 | Systems and Methods to Control DC/DC Multiphase Switching Regulators |
| CN104102262A (en) * | 2013-04-10 | 2014-10-15 | 凌力尔特公司 | System And Method For Providing Fast Transient Response With Dynamic Switching Frequency Adjustment |
| CN104102262B (en) * | 2013-04-10 | 2017-07-18 | 凌力尔特公司 | The system and method that fast transient response is provided are adjusted using dynamic switch frequency |
| CN104181380B (en) * | 2013-05-23 | 2017-03-01 | 远翔科技股份有限公司 | Light load current detection system |
| CN106053920A (en) * | 2016-07-20 | 2016-10-26 | 浙江大华技术股份有限公司 | Load loss detection circuit and power supply system |
| CN106053920B (en) * | 2016-07-20 | 2019-07-16 | 浙江大华技术股份有限公司 | A kind of load missing detecting circuit and power supply system |
| CN111030448A (en) * | 2019-12-30 | 2020-04-17 | 上海南芯半导体科技有限公司 | Light-load frequency reduction circuit of charge pump based on voltage difference control |
| CN111030448B (en) * | 2019-12-30 | 2020-12-29 | 上海南芯半导体科技有限公司 | Light-load frequency reduction circuit of charge pump based on voltage difference control |
| WO2021139629A1 (en) * | 2020-01-06 | 2021-07-15 | Shenzhen GOODIX Technology Co., Ltd. | Current load based mode control for converter circuit |
| US11139738B2 (en) | 2020-01-06 | 2021-10-05 | Shenzhen GOODIX Technology Co., Ltd. | Current load based mode control for converter circuit |
| CN117792017A (en) * | 2023-12-27 | 2024-03-29 | 山东大学 | Method and system for smoothing junction temperature fluctuation of IGBT module of grid-connected converter |
| CN117792017B (en) * | 2023-12-27 | 2025-04-04 | 山东大学 | Method and system for smoothing junction temperature fluctuation of IGBT module of grid-connected converter |
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Effective date of registration: 20180820 Address after: 1, 7 yuan, 2 yuan 1 Street, Hsinchu, Taiwan, China Patentee after: Advanced Analog Technology, Inc. Address before: Hsinchu County, Taiwan, China Patentee before: Yuanxiang Technology Co., Ltd. |