Current detection device of totem pole power factor correction circuit, control device, power supply and electronic equipment
The current detection system in PFC circuits uses a current transformer and detection resistor with controlled switches to address the inefficiencies and safety issues of traditional methods, offering cost-effective and reliable short-circuit protection.
Patent Information
- Application Number
- CN202421401993.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-06-18
AI Technical Summary
Traditional PFC controllers cannot detect the through current of the upper and lower tubes of the power stage, cannot achieve bridge arm short circuit protection, and Hall sensors and resistance sampling solutions are costly and complex in circuits.
The current transformer and sense resistor are combined with a controlled switch, and the inductor current is detected through the current transformer and combined with the sense resistor to detect the current of the upper and lower bridge arm, which is compatible with the existing PFC controller definition.
Reduces costs, realizes short-circuit protection of bridge arm, and improves system reliability and debugging convenience.
Smart Images
Figure CN223107900U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of integrated circuits, and particularly to a current detection device, a control device, a power supply and an electronic device for a totem-pole power factor correction circuit. Background Art
[0002] The totem-pole power factor correction (PFC) controller can provide more optimized efficiency and is being used more and more. However, since its current is bidirectional and the current is only continuous at the inductor, traditional PFC controllers use Hall sensors or resistors to sample the inductor current. Generally, the cost of Hall sensors is relatively high, and the resistor sampling scheme usually requires isolated power supply for driving, and the circuit cost is also relatively high. Moreover, both of these methods only sample the inductor current and cannot detect the through-current of the upper and lower transistors of the power stage. If there is a short circuit in the bridge arm, protection cannot be achieved. Summary of the Utility Model
[0003] According to one aspect of the utility model, a current detection device for a totem-pole power factor correction circuit is provided. The current detection device includes a current transformer, a first switch, a second switch, a detection resistor and a current output unit. The totem-pole power factor correction circuit includes an inductor, a first transistor and a second transistor. Among them,
[0004] The first end of the inductor is connected to a preset voltage through the first transistor, and the first end of the inductor is grounded through the second transistor.
[0005] The primary winding of the current transformer is coupled to the first transistor, and the secondary winding of the current transformer is coupled to the first end of the first switch.
[0006] The detection resistor is coupled to the second transistor and the first end of the second switch.
[0007] The second end of the first switch and the second end of the second switch are both connected to the current output unit.
[0008] The current output unit is used to output a detection current signal.
[0009] In a possible implementation manner, the primary winding is coupled between the first end of the inductor and the first transistor, or the primary winding is coupled between the preset voltage and the first transistor.
[0010] In a possible implementation manner, the detection resistor is coupled between the first end of the inductor and the second transistor, or the detection resistor is coupled between the second transistor and the ground.
[0011] In a possible implementation, the first switch and the first transistor are both controlled by a first switch signal, and the second switch and the second transistor are both controlled by a second switch signal.
[0012] In a possible implementation, the first switch and the second switch each include a first switching transistor, a second switching transistor, and a first switching resistor, where
[0013] A first end of the first switching transistor serves as a first end of the switch.
[0014] A second end of the first switching transistor is connected to a first end of the second switching transistor and a first end of the first switching resistor.
[0015] A gate of the first switching transistor, a gate of the second switching transistor, and a second end of the first switching resistor are connected together and serve as a control end of the switch.
[0016] A second end of the second switching transistor serves as a second end of the switch.
[0017] The switch includes a first switch and a second switch.
[0018] In a possible implementation, the current output unit includes a current output resistor and a current output capacitor.
[0019] A first end of the current output resistor and a first end of the current output capacitor are both connected to a second end of the first switch and a second end of the second switch and are used to output the detection current signal.
[0020] A second end of the current output resistor and a second end of the current output capacitor are both grounded or connected to a fixed level.
[0021] In a possible implementation, the secondary winding is further connected to a current limiting resistor and a voltage stabilizing diode.
[0022] A first end of the secondary winding, a first end of the current limiting resistor, and a first end of the voltage stabilizing diode are all grounded.
[0023] A second end of the secondary winding, a second end of the current limiting resistor, and a second end of the voltage stabilizing diode are all connected to a first end of the first switch.
[0024] In a possible implementation, the power factor correction circuit further includes a first capacitor, a third transistor, and a fourth transistor, where
[0025] A source of the third transistor is connected to a drain of the fourth transistor and a first end of an AC power supply, and the AC power supply is used to output alternating current.
[0026] The drain of the third transistor is connected to the drain of the first transistor and the first end of the first capacitor, and is used to output a target voltage.
[0027] The second end of the inductor is connected to the second end of the AC power supply.
[0028] The gates of the first transistor, the second transistor, the third transistor, and the fourth transistor are used to receive corresponding control signals.
[0029] The source of the fourth transistor, the source of the second transistor, and the second end of the first capacitor are grounded.
[0030] According to one aspect of the present invention, a control device for a totem-pole power factor correction circuit is provided, and the control device includes the current detection device of the totem-pole power factor correction circuit.
[0031] According to one aspect of the present invention, a power supply is provided, and the power supply includes the current detection device of the totem-pole power factor correction circuit, or the control device of the totem-pole power factor correction circuit.
[0032] According to one aspect of the present invention, an electronic device is provided, and the electronic device includes the power supply.
[0033] The current detection device of the totem-pole power factor correction circuit according to the embodiment of the present invention combines a current transformer and a detection resistor to implement a current detection circuit, and processes and combines the current detection signals through controlled first and second switches, which can be compatible with the current totem-pole PFC controller definition, reduce costs, and at the same time detect the currents of the upper and lower bridge arms of the totem-pole fast switch, and can implement bridge arm short-circuit protection.
[0034] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present invention. According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present invention and are used together with the specification to explain the technical solutions of the present invention.
[0036] Figure 1 A schematic diagram of the current detection device of the totem-pole power factor correction circuit according to the embodiment of the present invention is shown.
[0037] Figure 2Shows a schematic diagram of a current detection device for a totem-pole power factor correction circuit according to an embodiment of the present invention.
[0038] Figure 3 Shows a schematic diagram of a current detection device for a totem-pole power factor correction circuit according to an embodiment of the present invention.
[0039] Figure 4 Shows a partial schematic diagram of a current detection device for a totem-pole power factor correction circuit according to an embodiment of the present invention.
[0040] Figure 5 Shows a schematic diagram of a power factor correction circuit according to an embodiment of the present invention.
[0041] Figure 6a Shows a schematic diagram of a preset current waveform and a detected current signal when the current detection device according to an embodiment of the present invention is in the positive half-cycle of the AC input. Figure 6b Shows a schematic diagram of a preset current waveform and a detected current signal when the current detection device according to an embodiment of the present invention is in the negative half-cycle of the AC input. Detailed implementation manners
[0042] The following will describe various exemplary embodiments, features, and aspects of the present invention in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.
[0043] In the description of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.
[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.
[0045] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0046] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" herein is not necessarily to be construed as superior to or better than other embodiments.
[0047] As used herein, the term "and / or" merely describes an association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" as used herein means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set composed of A, B, and C.
[0048] In addition, for better illustration of the present utility model, numerous specific details are given in the following specific implementation manners. Those skilled in the art should understand that the present utility model can also be implemented without certain specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail so as to highlight the gist of the present utility model.
[0049] Please refer to Figure 1 , Figure 1 which shows a schematic diagram of a current detection device of a totem-pole power factor correction (PFC) circuit according to an embodiment of the present utility model.
[0050] As Figure 1 shown, the current detection device includes a current transformer 10, a first switch SW1, a second switch SW2, a detection resistor R, and a current output unit CSO. The totem-pole power factor correction circuit includes an inductor L, a first transistor Q1, and a second transistor Q2. Among them,
[0051] a first end of the inductor L is connected to a preset voltage VBUS through the first transistor Q1, and the first end of the inductor L is grounded through the second transistor Q2.
[0052] The primary winding of the current transformer 10 is coupled to the first transistor Q1, and the secondary winding of the current transformer 10 is coupled to the first end of the first switch SW1.
[0053] The detection resistor R is coupled to the first end of the second transistor Q2 and the second switch SW2.
[0054] The second ends of the first switch SW1 and the second switch SW2 are both connected to the current output unit CSO.
[0055] The current output unit CSO is used to output a detection current signal Iout.
[0056] The current detection device of the totem pole power factor correction circuit according to the embodiment of the present invention combines the current transformer 10 and the detection resistor R to implement a current detection circuit, and processes and combines the current detection signals through the controlled first switch SW1 and second switch SW2, which can be compatible with the current definition of the totem pole PFC controller, reduce costs, and at the same time detect the currents of the upper and lower bridge arms of the totem pole fast tube, and can implement bridge arm short circuit protection.
[0057] The embodiment of the present invention does not limit the specific circuit structure of the totem pole power factor correction circuit, and those skilled in the art can perform current detection on the required totem pole power factor correction circuit according to the actual situation and needs.
[0058] The embodiment of the present invention does not limit the specific magnitude of the preset voltage, and those skilled in the art can set it according to the actual situation and needs. Exemplarily, the preset voltage can be the BUS voltage.
[0059] The embodiment of the present invention does not limit the specific implementation manners of the current transformer 10, the first switch SW1, the second switch SW2, and the current output unit CSO, and those skilled in the art can adopt appropriate devices or implementation manners according to the actual situation and needs.
[0060] The embodiment of the present invention does not limit the specific positional relationship between the current transformer 10 and the first transistor Q1, and the specific positional relationship between the detection resistor R and the second transistor Q2, and those skilled in the art can set them according to the actual situation and needs.
[0061] Please refer to Figure 2 , Figure 2 which shows a schematic diagram of the current detection device of the totem pole power factor correction circuit according to the embodiment of the present invention.
[0062] In a possible implementation manner, as Figure 2As shown, the primary winding is coupled between the first end of the inductor L and the first transistor Q1. Of course, the primary winding can also be coupled between the preset voltage VBUS and the first transistor Q1.
[0063] In a possible implementation, as Figure 2 shown, the detection resistor R is coupled between the second transistor Q2 and ground. Of course, the detection resistor R can also be coupled between the first end of the inductor L and the second transistor Q2.
[0064] It should be understood that the "ground" in the embodiments of the present invention can also be other preset fixed levels.
[0065] As a preferred implementation, as Figure 2 shown, the primary winding is coupled between the first end of the inductor L and the first transistor Q1, and the detection resistor R is coupled between the second transistor Q2 and ground. In this way, the embodiments of the present invention can reduce the interference generated by the rapid change of the dv / dt at the midpoint of the fast switch in the totem-pole power factor correction circuit on the sampling circuit, streamline the circuit, and save costs.
[0066] In a possible implementation, the first switch SW1 and the first transistor Q1 are both controlled by the first switch signal A, and the second switch SW2 and the second transistor Q2 are both controlled by the second switch signal B. The embodiments of the present invention do not limit the specific forms and generation methods of the first switch signal A and the second switch signal B, and those skilled in the art can refer to related technologies to implement them.
[0067] In a possible implementation, as Figure 2 shown, the secondary winding is also connected to the current-limiting resistor R1 and the voltage-regulating diode D1.
[0068] The first end of the secondary winding, the first end of the current-limiting resistor R1, and the first end of the voltage-regulating diode D1 are all grounded.
[0069] The second end of the secondary winding, the second end of the current-limiting resistor R1, and the second end of the voltage-regulating diode D1 are all connected to the first end of the first switch SW1.
[0070] In an example, as Figure 2 shown, during the positive half-cycle of the AC input, the current IL on the inductor L flows from left to right. In this case, the second transistor Q2 (lower transistor) is the main transistor (i.e., the fast transistor), and the first transistor Q1 (upper transistor) is the freewheeling transistor. During the conduction of the second transistor Q2, the current IB increases and flows through the sampling resistor R. At the same time, the second switch SW2 conducts, and the current output unit CSO detects the current, and the detected current IBS rises.
[0071] In one example, as Figure 2 shown, during the positive half-cycle of the AC input and when the first transistor Q1 is conducting, the current IL on the inductor L decreases and flows through the current transformer 10. At the same time, when the first transistor Q1 is conducting, the current output unit CSO detects the current, and the detected current IAS decreases.
[0072] Please refer to Figure 3 , Figure 3 which shows a schematic diagram of the current detection device of the totem-pole power factor correction circuit according to an embodiment of the present invention.
[0073] In one example, as Figure 3 shown, during the negative half-cycle of the AC input, the current on the inductor L flows from right to left. The first transistor Q1 is the main transistor, and the second transistor Q2 is the freewheeling transistor. During the conduction period of the first transistor Q1, the current IL increases negatively and flows through the CT. At the same time, when the first switch SW1 is conducting, the current output unit CSO detects the current, and the detected current IAS increases negatively.
[0074] In one example, as Figure 3 shown, during the negative half-cycle of the AC input and when the freewheeling transistor, the second transistor Q2, is conducting, the current on the inductor L decreases and flows through the detection resistor R. At the same time, when the second switch SW2 is conducting, the current output unit CSO detects the current, and the detected current IBS decreases negatively.
[0075] In a possible implementation manner, the first switch SW1 and the second switch SW2 may both include a first switch transistor, a second switch transistor, and a first switch resistor, where
[0076] the first end of the first switch transistor serves as the first end of the switch,
[0077] the second end of the first switch transistor is connected to the first end of the second switch transistor and the first end of the first switch resistor,
[0078] the gates of the first switch transistor, the second switch transistor, and the second end of the first switch resistor are connected together and serve as the control end of the switch,
[0079] the second end of the second switch transistor serves as the second end of the switch,
[0080] The switch includes the first switch SW1 and the second switch SW2.
[0081] Please refer to Figure 4 , Figure 4 which shows a partial schematic diagram of the current detection device of the totem-pole power factor correction circuit according to an embodiment of the present invention.
[0082] Exemplarily, as Figure 4 shown, the second switch SW2 may include an eleventh transistor Q11 (the first switching transistor of the second switch SW2), a twelfth transistor Q12 (the second switching transistor of the second switch SW2), and a third resistor R3 (the first switching resistor of the second switch SW2). The first switch SW1 may include a thirteenth transistor Q13 (the first switching transistor of the first switch SW1), a fourteenth transistor Q14 (the second switching transistor of the first switch SW1), and a fourth resistor R4 (the first switching resistor of the first switch SW1). Among them, the eleventh transistor Q11, the twelfth transistor Q12, the thirteenth transistor Q13, and the fourteenth transistor Q14 may all be NMOS transistors.
[0083] In a possible implementation, as Figure 4 shown, the current output unit CSO may include a current output resistor R5 and a current output capacitor C3.
[0084] The first end of the current output resistor R5 and the first end of the current output capacitor C3 are both connected to the second end of the first switch SW1 and the second end of the second switch SW2, and are used to output the detection current signal Iout.
[0085] The second end of the current output resistor R5 and the second end of the current output capacitor C3 are both grounded or connected to a fixed level.
[0086] The second end of the current output capacitor C3 and the second end of the current output resistor R5 are grounded or connected to a fixed level. By grounding or connecting the second end of the current output capacitor C3 and the second end of the current output resistor R5 to other fixed levels, the embodiments of the present invention can realize signals with relative changes in the output levels of the output ends of the two current output units CSO, achieving level shift. Of course, the embodiments of the present invention do not limit the specific levels to which the second end of the current output capacitor C3 and the second end of the current output resistor R5 are connected, and those skilled in the art can set them according to actual situations and needs.
[0087] It should be understood that the above introduction to the first switch SW1 and the second switch SW2 is exemplary and should not be regarded as a limitation on the embodiments of the present invention. Those skilled in the art can set the implementation manners of the first switch SW1 and the second switch SW2 according to actual situations and needs. For example, the first switch SW1 and the second switch SW2 can also be implemented by a mature bidirectional switch module.
[0088] Moreover, the above introduction to the current output unit CSO is exemplary and should not be regarded as a limitation of the embodiments of the present invention. Those skilled in the art can set the implementation manner of the current output unit CSO according to the actual situation and needs. For example, the current output unit CSO can also be implemented by a mature integration circuit. For example, an integration circuit is formed by an input resistor, a feedback capacitor, and an operational amplifier. The input resistor is arranged at the negative input terminal of the operational amplifier to receive current. The positive input terminal of the operational amplifier can be grounded. The feedback capacitor is connected across the negative input terminal and the output terminal of the operational amplifier. Of course, the integration circuit can also have other implementation manners, and those skilled in the art can set it according to the actual situation and needs.
[0089] Please refer to Figure 5 , Figure 5 which shows a schematic diagram of a power factor correction circuit according to an embodiment of the present invention.
[0090] In a possible implementation manner, as Figure 5 shown, the power factor correction circuit may further include a first capacitor C1, a third transistor Q3, and a fourth transistor Q4, where
[0091] the source of the third transistor Q3 is connected to the drain of the fourth transistor Q4 and the first end of the AC power supply AC, and the AC power supply AC is used to output alternating current,
[0092] the drain of the third transistor Q3 is connected to the drain of the first transistor Q1 and the first end of the first capacitor C1, and is used to output the target voltage Vo,
[0093] the second end of the inductor L is connected to the second end of the AC power supply AC,
[0094] the gates of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are used to receive corresponding control signals,
[0095] the source of the fourth transistor Q4, the source of the second transistor Q2, and the second end of the first capacitor C1 are grounded.
[0096] The above description of the bridgeless PFC is exemplary and should not be regarded as a limitation of the embodiments of the present invention. In other embodiments, the bridgeless PFC may also include other implementation manners.
[0097] Please refer to Figure 6a , Figure 6b , Figure 6a which shows a schematic diagram of the waveforms of the preset current waveform and the detected current signal Iout when the current detection device according to the embodiment of the present invention is in the positive half cycle of the AC input.Figure 6b It shows a schematic diagram of the waveforms of a preset current waveform and a detected current signal Iout when the current detection device according to an embodiment of the present invention is in the negative half cycle of an AC input.
[0098] As Figure 6a 、 Figure 6b shown, the embodiments of the present invention can detect the currents of the upper and lower bridge arms of a totem pole fast switch, and have high accuracy.
[0099] In summary, the current detection device of the totem pole power factor correction circuit according to the embodiments of the present invention has the following advantages:
[0100] It does not require a Hall sensor or an isolation amplifier;
[0101] Compared with the dual CT scheme, the current detection using CT combined with a resistor is more widely used and has a lower cost, which is conducive to mass production in the supply chain;
[0102] It reduces the overall cost and application difficulty of the totem pole PFC, and is convenient for popularization;
[0103] It simultaneously detects the currents of the upper and lower bridge arms, prevents short circuits, improves the reliability of the system, and is easy to debug.
[0104] According to one aspect of the present invention, there is provided a control device for a totem pole power factor correction circuit, and the control device includes the current detection device of the totem pole power factor correction circuit.
[0105] Of course, the control device may further include a control component to output control signals for each switch. In one example, the control component includes, but is not limited to, a separate processor, or discrete components, or a combination of a processor and discrete components. The processor may include a controller in an electronic device having an instruction execution function, and the processor may be implemented in any suitable manner. For example, it is implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components. Inside the processor, the executable instructions may be executed by hardware circuits such as logic gates, switches, application specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers.
[0106] According to one aspect of the present invention, there is provided a power supply, and the power supply includes the current detection device of the totem pole power factor correction circuit, or, the control device of the totem pole power factor correction circuit.
[0107] According to one aspect of the present utility model, there is provided an electronic device, and the electronic device includes the power supply described above.
[0108] The embodiments of the present utility model have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application or the improvement of the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.
Claims
1. A current detection device for a totem-pole power factor correction circuit, characterized in that The current detection device includes a current transformer, a first switch, a second switch, a detection resistor, and a current output unit. The totem-pole power factor correction circuit includes an inductor, a first transistor, and a second transistor. Among them, The first end of the inductor is connected to a preset voltage through the first transistor, and the first end of the inductor is grounded through the second transistor. The primary winding of the current transformer is coupled to the first transistor, and the secondary winding of the current transformer is coupled to the first end of the first switch. The detection resistor is coupled to the second transistor and the first end of the second switch. The second end of the first switch and the second end of the second switch are both connected to the current output unit. The current output unit is used to output a detection current signal.
2. The current detection device of the totem-pole power factor correction circuit according to claim 1, wherein The primary winding is coupled between the first end of the inductor and the first transistor, or the primary winding is coupled between the preset voltage and the first transistor; The detection resistor is coupled between the first end of the inductor and the second transistor, or the detection resistor is coupled between the second transistor and the ground.
3. The current detection device of the totem pole power factor correction circuit according to claim 1 or 2, characterized in that, The first switch and the first transistor are both controlled by a first switch signal, and the second switch and the second transistor are both controlled by a second switch signal.
4. The current detection device of the totem pole power factor correction circuit according to claim 1, wherein The first switch and the second switch both include a first switch transistor, a second switch transistor, and a first switch resistor. Among them, The first end of the first switch transistor serves as the first end of the switch. The second end of the first switch transistor is connected to the first end of the second switch transistor and the first end of the first switch resistor. The gates of the first switch transistor, the second switch transistor, and the second end of the first switch resistor are connected together and serve as the control end of the switch. The second end of the second switch transistor serves as the second end of the switch. The switch includes a first switch and a second switch.
5. The current detection device of the totem pole power factor correction circuit according to claim 1, characterized in that, The current output unit includes a current output resistor and a current output capacitor. The first end of the current output resistor and the first end of the current output capacitor are both connected to the second end of the first switch and the second end of the second switch and are used to output the detection current signal. The second end of the current output resistor and the second end of the current output capacitor are both grounded or connected to a fixed level.
6. The current detection device of the totem-pole power factor correction circuit according to claim 1, characterized in that, The secondary winding is also connected to a current-limiting resistor and a voltage-regulating diode. The first end of the secondary winding, the first end of the current-limiting resistor, and the first end of the voltage-regulating diode are all grounded. The second end of the secondary winding, the second end of the current-limiting resistor, and the second end of the voltage-regulating diode are all connected to the first end of the first switch.
7. The current detection device of the totem-pole power factor correction circuit according to claim 1, characterized in that, The power factor correction circuit further includes a first capacitor, a third transistor, and a fourth transistor. Among them, The source of the third transistor is connected to the drain of the fourth transistor and the first end of an AC power supply, and the AC power supply is used to output alternating current. The drain of the third transistor is connected to the drain of the first transistor and the first end of the first capacitor and is used to output a target voltage. The second terminal of the inductor is connected to the second terminal of the AC power supply. The gates of the first transistor, the second transistor, the third transistor, and the fourth transistor are used to receive corresponding control signals. The source of the fourth transistor, the source of the second transistor, and the second terminal of the first capacitor are grounded.
8. A control device for a totem-pole power factor correction circuit, characterized in that, The control device includes the current detection device of the totem pole power factor correction circuit according to any one of claims 1 to 7.
9. A power supply, characterized in that, The power supply includes the current detection device of the totem pole power factor correction circuit according to any one of claims 1 to 8, or the control device of the totem pole power factor correction circuit according to claim 8.
10. An electronic device, characterized in that, The electronic device includes the power supply according to claim 9.