CN204615631U - A kind of busbar voltage ripple compensation control circuit of circuit of power factor correction - Google Patents

A kind of busbar voltage ripple compensation control circuit of circuit of power factor correction Download PDF

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CN204615631U
CN204615631U CN201520079541.8U CN201520079541U CN204615631U CN 204615631 U CN204615631 U CN 204615631U CN 201520079541 U CN201520079541 U CN 201520079541U CN 204615631 U CN204615631 U CN 204615631U
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voltage
input
module
circuit
sampling module
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陈志刚
孟令杰
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Shanghai Kostal Huayang Automotive Electric Co Ltd
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Shanghai Kostal Huayang Automotive Electric Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The utility model relates to a kind of busbar voltage ripple compensation control circuit of circuit of power factor correction, comprises and does not control rectifier bridge, inductance, full-control type semiconductor device, diode, electric capacity; The adjuster of input voltage sampling module, inductive current sampling module, output voltage sampling module, output voltage control loop, the adjuster of input current control loop, PWM drive singal generation module, ripple generator, computing module one and computing module two; Input voltage sampling module and inductive current sampling module are installed between the input voltage after rectification and inductance, and ripple generator is connected on output voltage sampling module; Computing module one is connected with input voltage sampling module, and computing module two is all connected with the adjuster of computing module one, input voltage sampling module, output voltage control loop.The fluctuation signal of PFC output voltage removes by the utility model in control loop, and then can improve the bandwidth of Voltage loop, ensures input waveform quality simultaneously.

Description

A kind of busbar voltage ripple compensation control circuit of circuit of power factor correction
Technical field
The utility model belongs to rectify control technical field, is specifically related to a kind of busbar voltage ripple compensation control circuit of circuit of power factor correction.
Background technology
Power factor refers to the relation between active power and total power consumption (apparent power), and namely active power is divided by the ratio of total power consumption (apparent power).Substantially power factor can weigh the degree that electric power is used effectively, and power factor value is larger, represents its electric power utilance higher.
Needed for a lot of electric equipment, the form of electric energy is direct current at present, needs the AC energy on electrical network to be converted into direct current energy.This just needs rectification circuit to be direct current by AC conversion.Although early stage uncontrollable rectifier circuit has simply, lower-cost feature can bring a lot of harmonic wave, and power factor is very low, brings interference also can to other power consumption equipment.At present propose certain requirement with the domestic harmonic wave that all produces power consumption equipment and power factor in the world.Therefore, power factor correction (PFC:Power Factor Correction) circuit obtains universal.
The most general Single-phase PFC circuit topology of current application is Boost, is input as grid alternating current.Export direct current, basic circuit topology as shown in Figure 1: in FIG, L and N is ac input end, DC+ and DC-is DC output end, and controlling object is be controlled to the sine wave consistent with input voltage waveform phase place by exchanging the input current of input side.Because input voltage is sinusoidal wave, input current is also sinusoidal wave, and the instantaneous power waveform so inputted also is sinusoidal form.At input voltage zero crossing place, input instantaneous power is zero, and when input voltage reaches peak value, input power also reaches peak value.But output voltage is direct current, the power therefore exported is also DC form, and therefore will produce the unequal state of instantaneous input and output power, the difference on this power balances by output capacitance.When inputting instantaneous power and being less than power output, electric capacity releases energy, and output voltage can reduce.When input power exceedes power output, capacitive absorption energy, output voltage can raise.The operating state of Here it is Single-phase PFC circuit, the factors such as therefore its output voltage will inevitably exist fluctuation, the capacitance of amplitude of its fluctuation and power output and electric capacity are relevant, and briefly, power is larger, fluctuates larger, and electric capacity is larger, fluctuates less.Fig. 2 and Fig. 3 is Single-phase PFC circuit input voltage electric current common at present and the typical waveform figure of output voltage.
Utility model content
For the problems referred to above, main purpose of the present utility model is under the prerequisite of guarantee input current waveform quality, improves the bandwidth of Voltage loop, and then improves the dynamic property of Voltage loop.Reduce the fluctuating range that PFC output voltage causes by load variations, and then reduce design difficulty and the cost of whole product.
The utility model solves above-mentioned technical problem by following technical proposals: a kind of busbar voltage ripple compensation control circuit of circuit of power factor correction, and the busbar voltage ripple compensation control circuit of described circuit of power factor correction comprises and do not control rectifier bridge BD1, inductance L 1, full-control type semiconductor device Q1, diode D1, electric capacity C1; The adjuster Gcv of input voltage sampling module, inductive current sampling module, output voltage sampling module, output voltage control loop, adjuster Gci, PWM drive singal generation module PWM of input current control loop, computing module one and computing module two;
Input voltage sampling module and inductive current sampling module are installed between the input voltage after rectification and inductance L 1, the adjuster Gci of input current control loop is connected to the control signal receiving pole of full-control type semiconductor device Q1 by PWM drive singal generation module, the busbar voltage ripple compensation control circuit of described circuit of power factor correction also comprises ripple generator, and described ripple generator is connected on output voltage sampling module;
Computing module one is connected with input voltage sampling module, and computing module two is all connected with the adjuster Gcv of computing module one, input voltage sampling module, output voltage control loop.
In preferred embodiment of the present utility model, described computing module one calculates the product of input voltage effective value and input voltage downsampling factor.
In preferred embodiment of the present utility model, described computing module two has three input signals, be respectively A, B and C, the result of this module calculating K m*A*B/C, Km is a fixing coefficient, A is the output valve of the adjuster Gcv of output voltage control loop, and B is the input voltage sampled value recorded in input voltage sampling module, and C is the calculating output valve of computing module one.
Positive progressive effect of the present utility model is: the busbar voltage ripple compensation control circuit of the circuit of power factor correction that the utility model provides has the following advantages: the fluctuation signal of PFC output voltage removes by the utility model in control loop, and then the bandwidth of Voltage loop can be improved, ensure input waveform quality simultaneously.
Accompanying drawing explanation
Fig. 1 is Single-phase PFC circuit common at present.
Fig. 2 is Single-phase PFC circuit input voltage common at present and the typical waveform figure of electric current.
Fig. 3 is the typical waveform figure of Single-phase PFC circuit output voltage common at present.
Fig. 4 is the control principle drawing of Single-phase PFC circuit common at present.
Fig. 5 is the control principle drawing of the Single-phase PFC circuit adopting busbar voltage ripple compensation.
Fig. 6 is the figure of the stable state waveform of the input current of the circuit simulation that have employed in Fig. 5.
Fig. 7 is the figure of the stable state waveform of the output voltage of the circuit simulation that have employed in Fig. 5.
Fig. 8 is the stable state oscillogram of the input current of the circuit simulation that have employed in Fig. 4.
Fig. 9 is the stable state oscillogram of the output voltage of the circuit simulation that have employed in Fig. 4.
Figure 10 is the figure of the waveform of output voltage in the load changing situation of the circuit simulation that have employed in Fig. 5.
Figure 11 is the figure of the waveform of input current in the load changing situation of the circuit simulation that have employed in Fig. 5.
Figure 12 is the figure of the waveform of output voltage in the load changing situation of the circuit simulation that have employed in Fig. 4.
Figure 13 is the figure of the waveform of input current in the load changing situation of the circuit simulation that have employed in Fig. 4.
Embodiment
The utility model preferred embodiment is provided, to describe the technical solution of the utility model in detail below in conjunction with accompanying drawing.
Make input current follow the wave form varies of input voltage, key is that the method by controlling realizes.Fig. 4 is a kind of PFC control principle drawing generally adopted at present.Pfc circuit needs the variable controlled to have two, and an output voltage Vdc, another is input current.The control objectives of Vdc makes the mean value of Vdc reach output loading required voltage value.The control objectives of input current makes the waveform of input current become the synchronous sine wave with input voltage.Its amplitude size is determined by output loading.Controlling object to reach these two, needing two control loops: output voltage control loop, input current control loop.The adjuster of output voltage control loop is Gcv, and the adjuster of input current control loop is Gci.The instruction of Voltage loop is Vref, namely wishes the output voltage values of circuit.The formation of the instruction of electric current loop is more complicated, is by the output signal A of voltage regulator, input voltage sampled signal B, and input voltage sampled signal effective value C, and a constant Km, produced according to diagram formula.Wherein the effect of input voltage sampled signal B makes the shape of current-order consistent with input voltage with phase place, and the effect of A is for regulating the amplitude of current-order, and control inputs power and power output balance.When power output increases, Vdc can reduce, and Voltage loop adjuster can receive a positive error signal, and it exports A and can increase, and then electric current loop instruction Iref amplitude is increased.And then input current is increased, increase input power, make output voltage come back to set point, vice versa.The object of input voltage effective value C is mainly subject to the response speed of input voltage fluctuation impact in order to accelerate current-order.If power output is constant, input voltage is little suddenly, and C also reduces thereupon, and the formula now according to diagram, current-order can corresponding increase.Maintenance input power is constant, and changes without the need to the output A of voltage regulator, and vice versa.Therefore, the power factor of input current is improved, must make the shape of the shape of current command signal and phase place and B and phase place consistent.Therefore, just must ensure that the waveform of C and A is direct current, can not have fluctuation, C is effective value, is DC quantity naturally.But the output A of voltage regulator is that direct current is but not easy, and according to analysis above, output voltage certainly exists the sinusoidal fluctuation that doubles input voltage frequency, but the command signal of Voltage loop is but a direct current signal.Therefore the input error signal of a voltage regulator necessarily fluctuation signal that there is twice input voltage frequency.Suppose that input voltage frequency is 50Hz, so the vibration frequency of error signal is 100Hz, for common PID adjuster, if want to allow the output signal of adjuster can ignore this fluctuation, only the mean value of output voltage is worked, so the bandwidth of Voltage loop just must far below 100Hz, and only have bandwidth enough low, control loop can ignore the impact of the fluctuation signal of this 100Hz.If bandwidth is higher, voltage regulator will identify this fluctuation, makes the waveform of current-order be no longer sinusoidal wave, towards the waveform of the direction adjustment input current making output voltage fluctuate as far as possible little.Therefore, the sinusoidal degree of input current waveform and the fluctuation size of output voltage are conflicts.
Can see from analysis above, in traditional PFC control strategy, the bandwidth of Voltage loop is subject to very large restriction, improve the approach of input current waveform mainly: 1. increase output capacitance, the fluctuation of output voltage is reduced, thus the fluctuation of the input error signal of voltage regulator is reduced, reach the object improving current command signal waveform; 2. reduce the control bandwidth of Voltage loop, what the output signal of voltage regulator was become is more straight, reaches the object improving current command signal.These two measures all can have a negative impact to product. and increase electric capacity, product cost and volume can be increased.Reduce Voltage loop and control the dynamic adjustments ability that bandwidth can reduce output voltage.Such as, when output loading suddenlys change, the fluctuation of output voltage can be very large, can not be adjusted to the magnitude of voltage of hope very soon.Amplitude and the time of this dynamic adjustment process acquire a certain degree, concerning what can not accept often client.Those products higher to load dynamic change adjustment performance requirement, often adopt two-layer configuration, prime is PFC, is mainly used in control inputs current shaping, and rear class is DCDC, the converter that a direct current input direct-current exports.The effect of rear class mainly contains two, and one is when product needed insulate, and provides insulation: two is the dynamic adjustment capability improving output of products, the control bandwidth of rear class is higher, when making load changing, or when the fluctuation of PFC output voltage is larger, maintain the final output voltage of product steady.
If PFC output voltage dynamic adjustment capability is poor, its exporting change scope is just very large, and this selects device withstand voltage and the design of circuit working scope of rear class all can bring a lot of challenges.Often cause the allowance of product design excessive, bring the raising of cost.
Single-phase PFC circuit, when input current perfection follows input voltage ideally, its output dc voltage certainly exists the fluctuation that doubles input voltage frequency.It is very low that this existence of fluctuating forces the bandwidth of Voltage loop to be fallen, thus obtain the Current Control instruction of a standard.Therefore, the fluctuation of output voltage is the key factor of dealing with problems.
The waveform of this voltage fluctuation can push over out according to electricity general principles such as input-output power conservations, and formula is as follows:
V bus _ ripple ( t ) = P in · sin ( 4 · π · F line · t ) 4 · π · F line · C bus · V bus
Pin: input power; Fline: input voltage frequency; Cbus:PFC output capacitance capacitance; Vbus:PFC output voltage average value.
If this fluctuometer calculates by we, in voltage feedback signal, cut this fluctuation, or on voltage command signal, add that this fluctuates, all can reach the effect of the fluctuation eliminating voltage regulator error originated from input.Like this, under voltage regulator can be arranged in higher bandwidth, export a direct current signal relatively stably, so just can obtain the current command signal of a standard, thus ensure that the waveform quality of input current.
What this fluctuated obtains also to be obtained by the mode of filtering.But effect is good not as the method calculated above.
Fig. 4 is the control principle drawing of Single-phase PFC circuit common at present, and Fig. 5 is the control principle drawing of the Single-phase PFC circuit adopting busbar voltage ripple compensation.Many ripple generator modules in Fig. 5 are from Fig. 4 different.The utility model cuts this fluctuation in voltage signal feedback, also can add that on voltage command signal this fluctuates, also can obtain identical effect.
In circuit shown in Fig. 5, Kf is input voltage downsampling factor, and Ks is inductive current downsampling factor, and Kv is output voltage downsampling factor, and Gci is electric current loop adjuster.The busbar voltage ripple compensation control circuit of the circuit of power factor correction that the utility model provides comprises and does not control rectifier bridge BD1, inductance L 1, full-control type semiconductor device Q1, diode D1, electric capacity C1, input voltage sampling module; Inductive current sampling module; Output voltage sampling module; The adjuster Gcv of output voltage control loop, adjuster Gci, PWM drive singal generation module PWM of input current control loop, computing module one and computing module two.
Input voltage sampling module and inductive current sampling module are installed between the input voltage after rectification and inductance L 1, the adjuster Gci of input current control loop is connected to the control signal receiving pole of full-control type semiconductor device Q1 by PWM drive singal generation module, the busbar voltage ripple compensation control circuit of this circuit of power factor correction also comprises ripple generator, and ripple generator is connected on output voltage sampling module;
Computing module one: computing module one is connected with input voltage sampling module, computing module two: computing module two is all connected with the adjuster (Gcv) of computing module one, input voltage sampling module, output voltage control loop.
Computing module one calculates the product of input voltage effective value (Vinrms) and input voltage downsampling factor (Kf).
In circuit shown in Fig. 5, Kf is input voltage downsampling factor, and Ks is inductive current downsampling factor, and Kv is output voltage downsampling factor, and Gci is electric current loop adjuster.
Cal is the abbreviation calculated, and Vinrms represents input voltage effective value, and Kf represents downsampling factor.
The input of whole module is through sampling element and amplifies Kf input voltage doubly, and Kf input voltage effective value is doubly amplified in output, and the effect of this module is the effective value calculating input signal.
Computing module two has three input signals, be respectively A, B and C, the result of this module calculating K m*A*B/C, Km is a fixing coefficient, A is the output valve of the adjuster (Gcv) of output voltage control loop, B is the input voltage sampled value recorded in input voltage sampling module, and C is the calculating output valve of computing module one.
Km is a fixing coefficient, and this module has three input signals, and the effect being respectively this module of A, B, C is the result calculating Km*A*B/C.
In computing module one, Cal is the abbreviation calculated, and Vinrms represents input voltage effective value, and Kf represents downsampling factor.
The input of whole module is through sampling element and amplifies Kf input voltage doubly, and Kf input voltage effective value is doubly amplified in output, and the effect of this module is the effective value calculating input signal.
Fig. 6 is the figure of the stable state waveform of the input current of the circuit simulation that have employed in Fig. 5, now Voltage loop bandwidth arrange higher.Wherein transverse axis is chronomere is second, and the longitudinal axis is electric current, and unit is A.Fig. 7 is the figure of the stable state waveform of the output voltage of the circuit simulation that have employed in Fig. 5.Wherein transverse axis is chronomere is second, and the longitudinal axis is voltage, and unit is V.Fig. 8 is the stable state oscillogram of the input current of the circuit simulation that have employed in Fig. 4, and now the bandwidth of Voltage loop is set to the high bandwidth identical with Fig. 5 circuit.
Wherein the chronomere of transverse axis is second, and the longitudinal axis is electric current, and unit is A.Waveform in Fig. 8 is compared with the waveform in Fig. 6, and current waveform becomes very not sinusoidal.Fig. 9 is the stable state oscillogram of the output voltage of the circuit simulation that have employed in Fig. 4.Wherein the chronomere of transverse axis is second, and the longitudinal axis is voltage, and unit is V.Compare with Fig. 7, voltage fluctuation is little a lot, and this causes because Voltage loop bandwidth is high.
Figure 10-13 is the waveforms when undergoing mutation of load.Figure 10 is the figure of the waveform of output voltage in the load changing situation of the circuit simulation that have employed in Fig. 5.Wherein the chronomere of transverse axis is second, and the longitudinal axis is voltage, and unit is V.
Figure 11 is the figure of the waveform of input current in the load changing situation of the circuit simulation that have employed in Fig. 5.Wherein the chronomere of transverse axis is second, and the longitudinal axis is electric current, and unit is A.Figure 12 is the figure of the waveform of output voltage in the load changing situation of the circuit simulation that have employed in Fig. 4, and now the bandwidth of Voltage loop is very low in order to what reach that the current sinusoidal degree identical with Fig. 5 circuit arrange.Wherein transverse axis is chronomere is second, and the longitudinal axis is voltage, and unit is V.Compare with Figure 10, voltage response speed is obviously slack-off.
Figure 13 is the figure of the waveform of input current in the load changing situation of the circuit simulation that have employed in Fig. 4.Wherein the chronomere of transverse axis is second, and the longitudinal axis is electric current, and unit is A.Compare with Figure 11, current response rate is obviously slack-off.
Can see, same ensure the prerequisite of current quality under, when not adopting Fig. 5 method, have to reduce the bandwidth of Voltage loop, make output voltage when load dump, rising a lot, regulation time is also very long.
After adopting the method for Fig. 5, Voltage loop bandwidth can keep very fast.After load changing, very little on the impact of output voltage.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall within the scope of claimed the utility model, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (3)

1. a busbar voltage ripple compensation control circuit for circuit of power factor correction, is characterized in that: the busbar voltage ripple compensation control circuit of described circuit of power factor correction comprises and do not control rectifier bridge BD1, inductance L 1, full-control type semiconductor device Q1, diode D1, electric capacity C1; The adjuster Gcv of input voltage sampling module, inductive current sampling module, output voltage sampling module, output voltage control loop, adjuster Gci, PWM drive singal generation module PWM of input current control loop, computing module one and computing module two;
Input voltage sampling module and inductive current sampling module are installed between the input voltage after rectification and inductance L 1, the adjuster Gci of input current control loop is connected to the control signal receiving pole of full-control type semiconductor device Q1 by PWM drive singal generation module, the busbar voltage ripple compensation control circuit of described circuit of power factor correction also comprises ripple generator, and described ripple generator is connected on output voltage sampling module;
Computing module one is connected with input voltage sampling module, and computing module two is all connected with the adjuster Gcv of computing module one, input voltage sampling module, output voltage control loop.
2. the busbar voltage ripple compensation control circuit of circuit of power factor correction according to claim 1, is characterized in that: described computing module one calculates the product of input voltage effective value and input voltage downsampling factor.
3. the busbar voltage ripple compensation control circuit of circuit of power factor correction according to claim 1, it is characterized in that: described computing module two has three input signals, be respectively A, B and C, the result of this module calculating K m*A*B/C, Km is a fixing coefficient, A is the output valve of the adjuster Gcv of output voltage control loop, and B is the input voltage sampled value recorded in input voltage sampling module, and C is the calculating output valve of computing module one.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108631578A (en) * 2017-03-21 2018-10-09 意法半导体股份有限公司 Operate in the control unit of the switch converters of continuous conduction and Peak Current-Mode Controlled Circuit
CN109039214A (en) * 2018-08-08 2018-12-18 浙江鲲悟科技有限公司 Adjust the method and system of DC bus-bar voltage
CN111030501A (en) * 2020-01-03 2020-04-17 西南交通大学 Control method and control device of capacitor charging power supply
CN111697812A (en) * 2019-03-13 2020-09-22 青岛海尔智能技术研发有限公司 Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium
CN111697813A (en) * 2019-03-13 2020-09-22 青岛海尔智能技术研发有限公司 Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium
CN112737292A (en) * 2020-12-25 2021-04-30 杭州中恒电气股份有限公司 Control method, device, equipment and medium for improving current harmonic total distortion rate
CN113315394A (en) * 2021-06-15 2021-08-27 矽力杰半导体技术(杭州)有限公司 Control circuit and AC/DC power supply using same
WO2021184626A1 (en) * 2020-03-20 2021-09-23 苏州浪潮智能科技有限公司 Power factor correction control method, apparatus and device, and storage medium

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US10727734B2 (en) 2017-03-21 2020-07-28 Stmicroelectronics S.R.L. Control unit of a switching converter operating in continuous-conduction and peak-current-control mode
CN108631578B (en) * 2017-03-21 2022-05-13 意法半导体股份有限公司 Control unit for switching converter operating in continuous conduction and peak current control mode
CN108631578A (en) * 2017-03-21 2018-10-09 意法半导体股份有限公司 Operate in the control unit of the switch converters of continuous conduction and Peak Current-Mode Controlled Circuit
US11336172B2 (en) 2017-03-21 2022-05-17 Stmicroelectronics S.R.L. Control unit of a switching converter operating in continuous-conduction and peak-current-control mode
CN109039214A (en) * 2018-08-08 2018-12-18 浙江鲲悟科技有限公司 Adjust the method and system of DC bus-bar voltage
CN111697812A (en) * 2019-03-13 2020-09-22 青岛海尔智能技术研发有限公司 Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium
CN111697813A (en) * 2019-03-13 2020-09-22 青岛海尔智能技术研发有限公司 Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium
CN111697812B (en) * 2019-03-13 2022-03-04 青岛海尔智能技术研发有限公司 Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium
CN111697813B (en) * 2019-03-13 2022-03-04 青岛海尔智能技术研发有限公司 Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium
CN111030501A (en) * 2020-01-03 2020-04-17 西南交通大学 Control method and control device of capacitor charging power supply
CN111030501B (en) * 2020-01-03 2021-09-07 西南交通大学 Control method and control device of capacitor charging power supply
WO2021184626A1 (en) * 2020-03-20 2021-09-23 苏州浪潮智能科技有限公司 Power factor correction control method, apparatus and device, and storage medium
CN112737292A (en) * 2020-12-25 2021-04-30 杭州中恒电气股份有限公司 Control method, device, equipment and medium for improving current harmonic total distortion rate
CN113315394A (en) * 2021-06-15 2021-08-27 矽力杰半导体技术(杭州)有限公司 Control circuit and AC/DC power supply using same

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