TWI650923B - Power-factor correction circuit structure - Google Patents

Abstract

The invention provides a power factor correction circuit structure for an AC-DC power converter, comprising a first boost circuit, a second boost circuit, a sustain capacitor, a component voltage resistor and a controller. The first boosting circuit and the second boosting circuit are used to receive an input signal. The sustain capacitor is used to connect the first boosting circuit and the second boosting circuit to output an output signal to a load. The controller is configured to control the first boosting circuit and the second boosting circuit to alternately receive and process the input signal. The invention avoids the frequent opening/closing of the diode by the alternating action of the two sets of boosting circuits, thereby reducing the power loss caused by the diode.

Description

Power factor correction circuit structure

The present invention relates to a power factor correction circuit structure, and more particularly to a power supply for AC-DC conversion.

Energy conservation and environmental protection are regarded as one of the important policies in the world. The Energy Efficiency Alliance (80PLUS) has established specifications that require off-line AC-to-DC (AC-DC) power converters with power factor correction (PFC). Function, the power factor and efficiency must be reached at different loads such as 10%, 20%, 50% and 100%. Increasing the overall efficiency by the power factor correction technology enables the power supply to have higher efficiency and lower electromagnetic interference (EMI).

Referring to Figure 1, a schematic diagram of a power factor correction circuit structure 10 of a prior art power converter. The power factor correction circuit structure 10 includes a bridge diode rectifier 13, a sustain capacitor 17, a boost diode 16, an inductor 14, a power switch 15, and a controller 20. The controller 20 controls the power switch 15 and the bridge diode rectifier 13. Power factor correction and load regulation are achieved by detecting a change in voltage across the bridge diode rectifier 13, controlling the output voltage by the controller 20, and tracking changes in the instantaneous current of the inductor 14. The switching frequency of the controller 20 produces pulse wave modulation to control the power switch 15 whereby power factor correction is performed. During operation, when current flows through the inductor 14, the power switch 15, and the boost diode 16, conduction loss and switching loss occur; therefore, generally only lower loss power switches and boost diodes can be used. To increase conversion efficiency.

The power factor correction circuit of the prior art power converter has a complete operation process: an AC voltage source 11 generates an input signal and is processed by an electromagnetic filter 12, and then processed by the power factor correction circuit structure 10; when the voltage passes through the The power factor correction circuit structure 10 is converted into a DC signal by an AC signal, and then processed by the DC-DC converter 18 to be used by a load 19.

It should be noted that the bridge diode rectifier 13 is composed of a plurality of diodes. In addition to the losses caused by the frequent opening/closing of the diode, current is continuously applied to the inductor 14, the power switch 15, and the boosting diode 16, causing a temperature rise and a loss of thermal power.

The existing controller frequency control can only operate with a fixed load, and it is impossible to perform frequency control under different factors such as 10% 20% 50% 100% for power factor and efficiency. The frequency control of the controller has the following modes: 1. Fixed frequency control mode: controlled by a fixed frequency generated by an oscillator; 2. Programming fixed frequency control mode: by external resistor, external capacitor or combination of external capacitor and resistor, Frequency setting; 3. Synchronous frequency control mode: A frequency is provided externally for the controller to use.

In summary, the power factor correction circuit structure 10 of the prior art power converter has conduction loss, switching loss, and thermal power loss. The prior art can only improve different conduction losses, different switching losses, and different thermal power losses under different power loads, and cannot simultaneously improve the power factor and efficiency under different loads.

Therefore, how to effectively reduce the frequent opening/closing of the diode and lower the operating temperature is an urgent problem to be solved.

Referring to FIG. 2, a schematic diagram of a two-phase current detecting circuit 30 of a power factor correction circuit of a prior art power converter includes three capacitors, two resistors, two diodes, and two sets of inductive inductors. The sheer number of components creates an unavoidable power loss. The two sets of inductive inductors are indispensable components for sensing the current of the input line in order to obtain the current of the input line.

Referring to Fig. 3, there is shown a schematic diagram of an input signal voltage detecting circuit 40 of a power factor correction circuit of a prior art power converter. The power factor correction circuit of the power converter is connected to the controller 20 and requires two resistors together with a capacitor to measure the input signal voltage value. As with the current detecting circuit 30 described above, excessive use of parts causes unnecessary impedance loss, which is a problem to be solved.

Therefore, how to effectively reduce the number of components is also an urgent problem to be solved.

The invention provides a power factor correction circuit structure, which avoids the frequent opening/closing of the diode by the alternating action of the two sets of boost circuits, thereby reducing the power loss caused by the diode; The resistance can be used to obtain current information. By reducing the number of components, the operating temperature is reduced, the volume is reduced, and the cost is reduced. Further, the required power factor and efficiency must be achieved at different loads such as 10%, 20%, 50%, and 100%.

To solve the above technical problem, the present invention provides a power factor correction circuit structure for an AC-DC power converter, including a first boost circuit, a second boost circuit, a sustain capacitor, a component voltage resistor, and A controller.

The first boosting circuit and the second boosting circuit are used to receive an input signal. The sustain capacitor is used to connect the first boosting circuit and the second boosting circuit to output an output signal to a load. The component voltage resistor is connected in parallel with the sustain capacitor. The controller includes an integrated voltage sensing module and a programmable frequency control module. The controller is configured to control the first booster circuit and the second booster circuit to receive and process the input signal in turn; the integrated voltage sensing module generates a voltage signal of the input signal according to the current message of the input signal; The programming frequency control module is connected to a frequency changing unit to change the operating frequency of the controller.

In a preferred embodiment, the first boosting circuit includes a first inductor, a first boosting diode, a first loop diode, and a first power switch, and the second boosting circuit includes a second inductor, a second boost diode, a second loop diode, and a second power switch.

In a preferred embodiment, the first end of the first inductor receives the input signal, and the second end of the first inductor is connected to the first end of the first step-up diode and the first end of the first power switch The second end of the first boosting diode is connected to the first end of the sustaining capacitor, and the second end of the first power switch is connected to the second end of the sustaining capacitor and the first loop diode The first end of the first circuit diode is connected to the first end of the first inductor.

The first end of the second inductor receives the input signal, and the second end of the second inductor is connected to the first end of the second step-up diode and the first end of the second power switch, the second boost a second end of the diode is connected to the first end of the sustain capacitor, and a second end of the second power switch is connected to the second end of the sustain capacitor and the first end of the second loop diode, the second loop a second end of the diode is connected to the first end of the second inductor, and the second end of the first step-up diode is connected to the second end of the second step-up diode, the first power The second end of the switch is coupled to the second end of the second power switch.

In a preferred embodiment, the first inductor and the second inductor are independent core inductors or shared core integrated inductors.

In a preferred embodiment, the first end of the first loop diode is connected to the first pin of the controller by a current detecting resistor to measure the current information of the output signal.

In a preferred embodiment, the first power switch includes a first switch and a first backstop diode, the second power switch includes a second switch and a second backstop diode, the control The second pin of the device is connected to the first switch and the second switch to control the opening and closing of the first switch and the second switch.

In a preferred embodiment, the first power switch includes a first field effect transistor and a first backstop diode, and the second power switch includes a second field effect transistor and a second backstop. a diode, the controller connecting the first field effect transistor and the second field effect transistor to control on/off of the first field effect transistor and the second field effect transistor.

In a preferred embodiment, the power factor correction circuit structure further includes a third a boost circuit, the third boost circuit is configured to receive the input signal. The sustain capacitor is also used to connect the third boost circuit to output the output signal. The controller is further configured to control the first boosting circuit, the second boosting circuit, and the third boosting circuit to receive and process the input signal in turn.

In a preferred embodiment, the third boosting circuit includes a third inductor, a third boosting diode, a third loop diode, and a third power switch. The first end of the third inductor receives the input signal, and the second end of the third inductor is connected to the first end of the third step-up diode and the first end of the third power switch. The second end of the third boost diode is connected to the first end of the sustain capacitor. The second end of the third power switch is connected to the second end of the sustain capacitor and the first end of the third loop diode. The second end of the third loop diode is connected to the first end of the third inductor. The second end of the third step-up diode is connected to the second end of the second step-up diode. The second end of the third power switch is coupled to the second end of the second power switch.

In a preferred embodiment, the third power switch includes a third switch and a third backstop diode. The second pin of the controller is connected to the third switch and the second switch to control the opening/closing of the third switch.

In a preferred embodiment, the third power switch includes a third field effect transistor and a third backstop diode. The controller is coupled to the third field effect transistor to control the opening/closing of the third field effect transistor.

In a preferred embodiment, the controller is a programmable frequency controller.

In a preferred embodiment, the frequency varying unit comprises at least one frequency control resistor or at least one frequency control capacitor or a combination of one or more of a resistor and capacitor combination (RC).

In a preferred embodiment, the frequency changing unit further includes at least one switch for controlling the at least one frequency control resistor or the at least one frequency control capacitor or the at least one resistor and capacitor combination.

In a preferred embodiment, the at least one switch is electrically connected to the load.

Compared with the prior art, the present invention avoids the alternating action of two sets of boost circuits. The frequent opening/closing of the diode is avoided, thereby reducing the power loss caused by the diode; the current can be obtained by a current detecting resistor, and the operating temperature is lowered by reducing the number of components. Volume reduction and cost reduction. Further, the required power factor and efficiency must be achieved at different loads such as 10%, 20%, 50%, and 100%.

10, 100, 200, 300, 400, 500, 600‧‧‧ power factor correction circuit structure

11, 160‧‧‧ AC voltage source

12, 170‧‧ ‧ electromagnetic filter

13‧‧‧Bridge diode rectifier

14‧‧‧Inductance

15‧‧‧Power switch

16‧‧‧Boost diode

17, 140‧‧‧ Maintain Capacitance

18‧‧‧DC-DC converter

19, 150‧‧‧ load

20, 130‧‧ ‧ controller

30‧‧‧Two-phase current detection circuit

40‧‧‧Input signal voltage detection circuit

110‧‧‧First booster circuit

111‧‧‧First inductance

112‧‧‧First booster diode

113‧‧‧First power switch

114‧‧‧First loop diode

115‧‧‧First switch

116‧‧‧First backstop diode

120‧‧‧second boost circuit

121‧‧‧second inductance

122‧‧‧second booster diode

123‧‧‧second power switch

124‧‧‧Second circuit diode

125‧‧‧second switch

126‧‧‧second backstop diode

131‧‧‧ Current Sense Resistor

132‧‧‧First pin

133‧‧‧second pin

134‧‧‧Integrated voltage sensing module

135‧‧‧Programmable Frequency Control Module

171‧‧‧voltage resistor

172‧‧‧frequency change unit

173‧‧‧First frequency control resistor

174‧‧‧Second frequency control resistor

Va‧‧‧ voltage at the first end of the first inductor

Vb‧‧‧ voltage at the first end of the second inductor

180‧‧‧ Third booster circuit

181‧‧‧ Third inductance

182‧‧‧ Third booster diode

183‧‧‧ Third power switch

184‧‧‧ Third loop diode

185‧‧‧ third switch

186‧‧‧ Third backstop diode

1 is a schematic diagram showing a structure of a power factor correction circuit of a power converter of the prior art; FIG. 2 is a schematic diagram showing a two-phase current detecting circuit of a power factor correction circuit of a power converter of the prior art; and FIG. 3 is a view showing a prior art Schematic diagram of an input signal voltage detecting circuit of a power factor correction circuit of a power converter; FIG. 4 is a view showing a structure of a power factor correction circuit of a power converter of a first preferred embodiment of the present invention; FIG. 6 is a schematic diagram showing the structure of a power factor correction circuit of a power converter of a third preferred embodiment of the present invention; FIG. 7 is a view showing the structure of a power factor correction circuit of a power converter according to a third preferred embodiment of the present invention; A schematic diagram of a power factor correction circuit structure of a power converter of a fourth preferred embodiment of the invention; FIG. 8 is a diagram showing a structure of a power factor correction circuit of a power converter of a fifth preferred embodiment of the present invention; and The figure shows a schematic diagram of the power factor correction circuit configuration of the power converter of the sixth preferred embodiment of the present invention.

Referring to Fig. 4, there is shown a schematic diagram of a power factor correction circuit structure 100 of a power converter of a first preferred embodiment of the present invention. The power factor correction circuit structure 100 is used for The DC-DC power converter includes a first boost circuit 110, a second boost circuit 120, a sustain capacitor 140, a component voltage resistor 171, and a controller 130.

The first boosting circuit 110 and the second boosting circuit 120 are used to receive an input signal. In detail, the input signal is generated by an AC voltage source 160 processed by an electromagnetic filter 170. The sustain capacitor 140 is configured to connect the first booster circuit 110 and the second booster circuit 120 to output an output signal to a load 150. The component voltage resistor 171 is connected in parallel with the sustain capacitor 140. The controller 130 is configured to control the first boosting circuit 110 and the second boosting circuit 120 to alternately receive and process the input signal. In detail, the output signal is used for a load 150. The controller 130 includes an integrated voltage sensing module 134 and a programmable frequency control module 135. The integrated voltage sensing module 134 generates a voltage message of the input signal according to the current message of the input signal. In detail, the component voltage resistor 171 includes two resistors, wherein a signal line is pulled from the connection of the two resistors to the integrated voltage sensing module 134 to know the voltage signal and the boosting circuit of the input signal. Voltage message. Compared with the prior art, an extra pin is needed, and a resistor is used together with a set of resistance-capacitance (RC) impedance. After calculation, the voltage information of the input signal can be known, and the invention uses a large reduction of components (only one required) The pin) makes the cost drop drastically, and it is not necessary to use the two pins of the controller as in the prior art to separately know the voltage information of the input signal and the boost circuit. The programmable frequency control module 135 is coupled to a frequency changing unit 172 to change the operating frequency of the controller 130.

Referring to Fig. 5, there is shown a schematic diagram of a power factor correction circuit structure 200 of a power converter of a second preferred embodiment of the present invention. The difference between the preferred embodiment and the first preferred embodiment is that the detailed connection manners of the first boosting circuit 110 and the first boosting circuit 110 are described one by one. The first boosting circuit 110 includes a first inductor 111, a first boosting diode 112, a first loop diode 114, and a first power switch 113. The second boosting circuit 120 includes a second inductor 121 , a second boosting diode 122 , a second loop diode 124 , and a second power switch 123 .

The first end of the first inductor 111 receives the input signal, and the first inductor 111 The second end of the first boosting diode 112 is connected to the first end of the first boosting diode 112 and the first end of the first power switch 113; the second end of the first boosting diode 112 is connected to the first of the sustaining capacitors 140 One end of the first power switch 113 is connected to the second end of the first capacitor diode 114 and the second end of the first circuit diode 114; The first end of the first inductor 111.

The first end of the second inductor 121 receives the input signal, and the second end of the second inductor 121 is connected to the first end of the second step-up diode 122 and the first end of the second power switch 123; The second end of the second boosting diode 122 is connected to the first end of the sustaining capacitor 140; the second end of the second power switch 123 is connected to the second end of the sustaining capacitor 140 and the second loop diode 124 The first end of the second loop diode 124 is connected to the first end of the second inductor 121; the second end of the first boost diode 112 is connected to the second booster The second end of the first power switch 113 is connected to the second end of the second power switch 123.

In detail, the controller 130 includes at least a first pin 132. The first end of the first circuit diode 114 is connected to the first pin 132 of the controller 130 by the current detecting resistor 131 to measure the current information of the output signal. In other words, the first pin 132 is a current sense pin. Compared with the prior art, it is necessary to use the inductor to detect the current, so that the current information can be calculated. The invention can greatly reduce the cost because the components used are greatly reduced (only one resistor is needed).

In detail, the first power switch 113 includes a first switch 115 and a first backstop diode 116. The second power switch 123 includes a second switch 125 and a second backstop diode 126. The second pin 133 of the controller 130 is connected to the first switch 115 and the second switch 125 to control the opening/closing of the first switch 115 and the second switch 125.

During the actual operation, the AC voltage source 160 continuously outputs a sine wave (positive and negative alternate), that is, the voltage Va at the first end of the first inductor 111 subtracts the voltage Vb at the first end of the second inductor 121. Positive and negative alternate. There are several situations:

1. When the voltage Va of the first end of the first inductor 111 subtracts the second inductor 121 When the voltage Vb of the first end is greater than zero and the first power switch 113 and the second power switch 123 are both turned on, the current is processed by the first boosting circuit 110, sequentially passing through the first inductor 111, The first switch 115 and the second loop diode 124 are simultaneously in a non-conducting state. Because of the arrangement of the second step-up diode 122 and the second loop diode 124, the first booster circuit 110 operates normally. When the voltage Va of the first end of the first inductor 111 minus the voltage Vb of the first end of the second inductor 121 is less than zero, and the first power switch 113 and the second power switch 123 are both turned on, the current will be The second boosting circuit 120 performs processing to sequentially pass through the second inductor 121, the second switch 125, and the first loop diode 114, and the second loop diode 124 is in a non-conducting state. Because the first boosting diode 112 and the first loop diode 114 are disposed, the second boosting circuit 120 operates normally.

2. When the voltage Va at the first end of the first inductor 111 minus the voltage Vb at the first end of the second inductor 121 is greater than zero and the first power switch 113 and the second power switch 123 are both off, the current The first booster circuit 110 processes the first inductor 111, the first boost diode 112, the sustain capacitor 140, and the second loop diode 124 to provide boosting. The power is used by the load 150 while the first return diode 114 is in a non-conducting state. Because of the arrangement of the second step-up diode 122 and the second loop diode 124, the first booster circuit 110 operates normally. When the voltage Va of the first end of the first inductor 111 minus the voltage Vb of the first end of the second inductor 121 is less than zero, and the first power switch 113 and the second power switch 123 are both turned off, the current will be The second boosting circuit 120 performs processing to sequentially pass the second inductor 121, the second boosting diode 122, the sustaining capacitor 140, and the first loop diode 114 to provide boosted power. The load 150 is used while the second loop diode 124 is in a non-conducting state. Because the first boosting diode 112 and the first loop diode 114 are disposed, the second boosting circuit 120 operates normally.

In summary, by setting the first circuit diode 114 and the second circuit diode 124, the power factor correction circuit structure 200 can be in the first power switch 113 and the second power switch 123. It works normally when turned on/off.

In detail, the first inductor 111 and the second inductor 121 are independent core inductors or shared core integrated inductors, and different types of magnetic flux densities may be adopted according to different magnetic permeability, core loss, and temperature stability requirements. Iron core. Therefore, it can be used depending on the design in terms of component size, cost, and efficiency.

Referring to Fig. 6, there is shown a schematic diagram of a power factor correction circuit structure 300 of a power converter of a third preferred embodiment of the present invention. The difference between the preferred embodiment and the second preferred embodiment is that the first switch 115 is a first field effect transistor, the second switch 125 is a second field effect transistor, and the controller 130 is connected to the first A potent crystal and the second field effect transistor. In detail, the second pin 133 of the controller 130 is connected to the gate of the first field effect transistor and the gate of the second field effect transistor to control the first field effect transistor and the second field effect. The transistor is turned on/off. Further, in order to enhance the driving capability of the controller 130, there are several ways: 1. plus an NPN transistor and a PNP transistor, or an N-channel field effect transistor (N CHANNEL MOSFET) and a A P-channel field effect transistor (P CHANNEL MOSFET) drive circuit, or the same as the above-mentioned driver chip (IC); 2. Add a drive circuit with a single-channel or multi-channel gate drive chip (IC). The driving capability is enhanced or driven when a plurality of field effect transistors are connected in parallel to effectively lower the temperature, and the driving manner is the same as that of the second pin 133 of the controller 130.

In the present invention, the controller 130 can be a programmable frequency controller, and can adopt various power switches such as MOSFET, GaN, SiC, IGBT, etc., to provide various types of product applications to meet various power requirements.

Figure 7 is a diagram showing a power factor correction circuit structure 400 of a power converter of a fourth preferred embodiment of the present invention. The difference between the preferred embodiment and the second preferred embodiment is that a third boosting circuit 180 is further included. The third boosting circuit 180 includes a third inductor 181, a third boosting diode 182, a third loop diode 184, and a third power switch 183.

The first end of the third inductor 181 receives the input signal, and the second end of the third inductor 181 is connected to the first end of the third step-up diode 182 and the third end of the third power switch 183 The second end of the third boosting diode 182 is connected to the first end of the sustain capacitor 140; the second end of the third power switch 183 is connected to the second end of the sustain capacitor 140 and the third loop a first end of the third body diode 184 is connected to the first end of the third inductor 181; the second end of the third step-up diode 182 is connected to the second end The second end of the second power switch 183 is connected to the second end of the second power switch 123.

Similarly, the first end of the third circuit diode 184 is connected to the first pin 132 of the controller 130 by the current detecting resistor 131 to measure the current information of the output signal.

In detail, the third power switch 183 includes a third switch 185 and a third backstop diode 186. The second pin 133 of the controller 130 is also connected to the third switch 185 to control the opening/closing of the third switch 185.

However, in other preferred embodiments, there may be more than three sets of booster circuits, and are not limited thereto.

Referring to Fig. 8, there is shown a schematic diagram of a power factor correction circuit structure 500 of a power converter of a fifth preferred embodiment of the present invention. The difference between the preferred embodiment and the fourth preferred embodiment is that the first switch 115 is a first field effect transistor, the second switch 125 is a second field effect transistor, and the third switch 185 is a a third field effect transistor; the controller 130 is coupled to the first field effect transistor, the second field effect transistor, and the third field effect transistor. For the rest of the description, please refer to the fourth preferred embodiment, and details are not described herein again.

Referring to Fig. 9, there is shown a schematic diagram of a power factor correction circuit structure 600 of a power converter of a sixth preferred embodiment of the present invention. The difference between the preferred embodiment and the first preferred embodiment is that the programmable frequency control module 135 can be controlled by the frequency control unit 172 without the setting switch and the second frequency control resistor 174, and the first frequency control resistor is separately used. The operating frequency of the controller 130 can be changed by using a temperature coefficient resistor for program variable frequency control. Or by the voltage change feedback of the load 150, selecting the increase setting switch and the second frequency control resistor 174 to perform program modulation frequency control, the frequency changing unit 172 further includes a first frequency control resistor 173 and a second The frequency control resistor 174 changes the resistance through the switch control. It is possible to change the operating frequency of the controller accordingly. Similarly, the first frequency control resistor 173 and the second frequency control resistor 174 may also be frequency control capacitors. When the switch control capacitance changes, the operating frequency of the controller can be changed accordingly. Similarly, the first frequency control resistor 173 and the second frequency control resistor 174 may also be a combination of a resistor and a capacitor (RC). Similarly, through multiple switch control, multi-stage programming frequency control can be performed to control multiple frequency resistors, multiple frequency capacitors or multiple resistors and capacitor combinations (RC) to change the operating frequency of the controller. For example, if there is only one switch in this embodiment, there can be two different sets of frequencies. The first frequency control resistor 173 and the second frequency control resistor 174 of the frequency changing unit 172 may be various types of resistors such as temperature coefficient resistors and resistors, and are combined to form a plurality of programmable modulation variable frequency control modes.

Compared with the prior art, the present invention avoids the frequent opening/closing of the diode by the alternating action of the two boosting circuits, thereby reducing the power loss caused by the diode; and a current detecting resistor The current information can be obtained, and by reducing the number of components, the operating temperature is reduced, the volume is reduced, and the cost is reduced. There is no need to detect the input line voltage, and the integrated voltage sensing module 134 can convert the voltage information of the input signal according to the information of the current of the input signal, thereby reducing the number of pins. At the same time, the programmable frequency control module 135 is controlled by the frequency changing unit 172, and can be controlled by the first frequency control resistor 173 using a temperature coefficient resistor without the setting switch and the second frequency control resistor 174. . Alternatively, by the voltage change feedbacked by the load 150, the increase setting switch and the second frequency control resistor 174 are selected to perform resistance modulation, capacitance modulation or resistance and capacitance combination (RC) modulation, and programmable variable frequency conversion is performed. Rate control mode; in addition, it is also possible to program the variable frequency control mode in multiple stages, and use various types of resistors to form a plurality of programmable modulation and variable frequency control modes. Therefore, the frequency of operation can be changed according to different loads, and the required power factor and efficiency must be achieved at different loads such as 10%, 20%, 50%, and 100%.

While the invention has been described above by way of a preferred embodiment, the invention is not intended to be limited thereto, and the invention may be modified and modified without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is attached to the application The scope defined by the patent scope shall prevail.

Claims (12)

A power factor correction circuit structure for an AC-DC power converter includes: a first booster circuit and a second booster circuit, each for receiving an input signal, wherein the first booster circuit includes a first An inductor, a first booster diode, a first loop diode, and a first power switch, the first end of the first inductor receives the input signal, and the second end of the first inductor is connected to the first a first end of the boost diode and a first end of the first power switch, the second end of the first boost diode is connected to the first end of the sustain capacitor, and the second end of the first power switch The second end of the first circuit diode is connected to the first end of the first circuit diode, and the second end of the first circuit diode is connected to the first end of the first inductor, the second boost circuit The second inductor includes a second inductor, a second boost diode, a second loop diode, and a second power switch. The first end of the second inductor receives the input signal, and the second end of the second inductor Connecting the first end of the second step-up diode and the second power switch a first end, a second end of the second boost diode is connected to the first end of the sustain capacitor, and a second end of the second power switch is connected to the second end of the sustain capacitor and the second loop diode The first end of the second loop diode is connected to the first end of the second inductor, and the second end of the first boost diode is connected to the second boost diode The second end of the first power switch is connected to the second end of the second power switch; a sustaining capacitor is configured to connect the first boosting circuit and the second boosting circuit to output An output signal to a load; a voltage resistor connected in parallel with the sustain capacitor; and a controller including an integrated voltage sensing module and a programmable frequency control module for controlling the first liter The voltage circuit and the second boosting circuit receive and process the input signal in turn, and the programmable frequency control module is connected to a frequency changing unit to change the operating frequency of the controller. The first end of the first circuit diode is connected to the first pin of the controller by a current detecting resistor to measure current information of the output signal, wherein only a single point passes through the current detecting resistor Obtaining the current information of the output signal, the voltage information of the output signal is obtained by the integrated voltage sensing module through the voltage dividing resistor, and the voltage information of the output signal is processed by the integrated voltage sensing module. The integrated voltage sensing module generates a voltage message of the input signal according to the current message of the input signal. The power factor correction circuit structure of claim 1, wherein the first inductor and the second inductor are independent core inductors or shared core integrated inductors. The power factor correction circuit structure of claim 1, wherein the first power switch comprises a first switch and a first backstop diode, and the second power switch comprises a second switch and a first Secondly, the second pin of the controller is connected to the first switch and the second switch to control the opening and closing of the first switch and the second switch. The power factor correction circuit structure of claim 1, wherein the first power switch comprises a first field effect transistor and a first backstop diode, and the second power switch comprises a second field An effect transistor and a second backstop diode, the controller connecting the first field effect transistor and the second field effect transistor to control the first field effect transistor and the second field effect transistor On/off. The power factor correction circuit structure of claim 1-4, further comprising a third boosting circuit, wherein the third boosting circuit is configured to receive the input signal, and the maintaining capacitor is also used to connect the third The boosting circuit outputs the output signal, and the controller is further configured to control the first boosting circuit, the second boosting circuit, and the third boosting circuit to receive and process the input signal in turn. The power factor correction circuit structure according to claim 5, wherein the third boosting circuit comprises a third inductor, a third boosting diode, and a third loop diode And a third power switch, the first end of the third inductor receives the input signal, and the second end of the third inductor is connected to the first end of the third step-up diode and the third end of the third power switch The second end of the third boosting diode is connected to the first end of the sustaining capacitor, and the second end of the third power switch is connected to the second end of the sustaining capacitor and the third loop diode a first end, the second end of the third loop diode is connected to the first end of the third inductor, and the second end of the third boost diode is connected to the second boost diode The second end of the third power switch is connected to the second end of the second power switch. The power factor correction circuit structure according to claim 6, wherein the third power switch comprises a third switch and a third backstop diode, and the second pin of the controller is connected to the third The switch and the second switch control the opening/closing of the third switch. The power factor correction circuit structure according to claim 6, wherein the third power switch comprises a third field effect transistor and a third backstop diode, and the controller is connected to the third field power a crystal to control the on/off of the third field effect transistor. The power factor correction circuit structure of claim 1, wherein the controller is a programmable frequency controller. The power factor correction circuit structure according to claim 1, wherein the frequency change unit comprises at least one frequency control resistor or at least one frequency control capacitor or a combination of one or more of a resistor and capacitor combination (RC) . The power factor correction circuit structure of claim 10, wherein the frequency changing unit further comprises at least one switch for controlling the at least one frequency control resistor or the at least one frequency control capacitor or the at least one resistor and capacitor combination. The power factor correction circuit structure of claim 11, wherein the at least one switch is electrically connected to the load.