PFC circuit

Abstract

The utility model discloses a PFC circuit including a power supply module, a main power module and a control module, the control module is respectively connected with the power supply module and the main power module, the control module is used for collecting voltage and current of the PFC circuit, the power supply module includes a voltage stabilizing circuit, the voltage stabilizing circuit is connected with the control module, and the control module is connected with the main power module. The voltage stabilizing circuit is used for stabilizing input voltage, the main power module comprises an overcurrent and overvoltage protection circuit, a switching circuit and a PFC bridgeless totem-pole circuit which are electrically connected in sequence, and input current of the PFC circuit sequentially flows through the overcurrent and overvoltage protection circuit, the switching circuit and the PFC bridgeless totem-pole circuit. When a certain module in the PFC circuit goes wrong, the whole PFC board card does not need to be replaced, and the maintenance and replacement cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of household energy storage inversion, in particular to a PFC circuit. Background Art

[0002] PFC stands for Power Factor Correction. Power factor refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power divided by total power consumption (apparent power). Basically, power factor can measure the degree to which electricity is effectively utilized. The larger the power factor value, the higher the power utilization rate.

[0003] Currently, most PFC boards for AC power are integrated boards, which are not convenient for later maintenance and problem finding. Existing PFC boards have electromagnetic interference (EMI) and electromagnetic compatibility (EMC) problems caused by severe distortion of the current waveform due to capacitive loads, and will run in reverse to output 220V AC power. The integrated PFC board is not convenient to repair after being damaged, and the replacement cost is high. Utility Model Content

[0004] The main purpose of the utility model is to provide a PFC circuit, aiming to provide a PFC circuit with low replacement cost.

[0005] To achieve the above-mentioned purpose, the utility model proposes a PFC circuit, including a power supply module, a main power module, and a control module, wherein the control module is connected to the power supply module and the main power module respectively, the control module is used to collect the voltage and current of the PFC circuit, the power supply module includes a voltage stabilizing circuit, the voltage stabilizing circuit is connected to the control module, the voltage stabilizing circuit is used to stabilize the input voltage, the main power module includes an overcurrent and overvoltage protection circuit, a switching circuit, and a PFC bridgeless totem pole circuit that are electrically connected in sequence, and the input current of the PFC circuit flows through the overcurrent and overvoltage protection circuit, the switching circuit, and the PFC bridgeless totem pole circuit in sequence.

[0006] In one embodiment, the PFC circuit is connected to a neutral line and a live line, the PFC bridgeless totem pole circuit includes a first IGBT tube, a second IGBT tube, a third IGBT tube, and a fourth IGBT tube, the emitter of the first IGBT tube is electrically connected to the live line, the collector of the first IGBT tube is electrically connected to the collector of the second IGBT tube, the emitter of the second IGBT tube is electrically connected to the neutral line and the collector of the third IGBT tube, and the emitter of the third IGBT tube is electrically connected to the emitter of the fourth IGBT tube and the neutral line.

[0007] In one embodiment, the PFC circuit further includes an IGBT drive circuit, which is connected to the main power module and the control module, and is used to provide a gate voltage to the main power module.

[0008] In one embodiment, the PFC circuit further includes a temperature acquisition circuit, which is connected to the main power module and is used to acquire the temperature of the main power module.

[0009] In one embodiment, the PFC circuit further includes a cooling fan control circuit, the cooling fan control circuit is connected to the temperature acquisition circuit and the fan, and the temperature acquisition circuit acquires the fan temperature.

[0010] In one embodiment, the main power module is provided with a control interface circuit, the control interface circuit is electrically connected to the power module, and the control interface circuit is used to supply power to the power module.

[0011] In one embodiment, the PFC circuit further includes an isolation circuit, which is connected to the control module and is used to protect the control module.

[0012] In one embodiment, the isolation circuit is an optocoupler isolation circuit.

[0013] In one embodiment, the switching circuit includes a first MOS tube, a first switch, a first diode, and a second diode, the drain of the first MOS tube is connected to the cathode of the first diode and the first end of the first switch, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is connected to the second end of the first switch.

[0014] In one embodiment, at least one switching circuit is disposed in the PFC circuit.

[0015] The utility model adopts modular setting of the PFC circuit to divide the entire PFC circuit into a power module, a main power module, and a control module. The functions of each module are relatively independent and can be combined according to the required functions. The module is reusable and can be reused in different projects. When a problem occurs in a module in the PFC circuit, there is no need to replace the entire PFC board, and the maintenance and replacement cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is the schematic diagram of the PFC circuit;

[0018] Figure 2 A topological circuit diagram of part of the main power module;

[0019] Figure 3 Another part of the topology circuit diagram of the main power module;

[0020] Figure 4 It is an IGBT driving circuit;

[0021] Figure 5 For switching circuits;

[0022] Figure 6 This is the temperature acquisition circuit diagram;

[0023] Figure 7 It is the cooling fan control circuit;

[0024] Figure 8 To control the interface circuit;

[0025] Fig. 9 For isolation circuit.

[0026] Description of Figure Numbers:

[0027] 1-control module, 2-main power module, 21-PFC bridgeless totem pole circuit, 22-switching circuit, 23-overcurrent and overvoltage protection circuit, 3-power module, 31-voltage stabilizing circuit.

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] The utility model proposes a PFC circuit, comprising a power module 3, a main power module 2, and a control module 1. The control module 1 is connected to the power module 3 and the main power module 2 respectively. The control module 1 is used to collect the voltage and current of the PFC circuit. The power module 3 comprises a voltage stabilizing circuit 31. The voltage stabilizing circuit 31 is connected to the control module 1. The voltage stabilizing circuit 31 is used to stabilize the input voltage. The main power module 2 comprises an overcurrent and overvoltage protection circuit 23, a switching circuit 22, and a PFC bridgeless totem pole circuit 21 which are electrically connected in sequence. The input current of the PFC circuit flows through the overcurrent and overvoltage protection circuit 23, the switching circuit 22, and the PFC bridgeless totem pole circuit 21 in sequence.

[0033] In the embodiment of the present utility model, Figure 1 As shown, the PFC circuit adopts a modular setting of the PFC circuit, dividing the entire PFC circuit into a power module 3, a main power module 2, and a control module 1. The functions of each module are relatively independent and can be combined according to the required functions. It is reusable and can be reused in different projects. When a module in the PFC circuit has a problem, there is no need to replace the entire PFC board, and the maintenance and replacement cost is low.

[0034] The PFC circuit has relatively independent functions and a modular design. It can be combined according to the required functions and is reusable and can be reused in different projects. Some tasks can be carried out in parallel, which effectively shortens the design cycle. It simplifies the complexity of the main power board, reduces the difficulty of routing, and reduces interference in signal routing and power routing. It is convenient for post-debugging and maintenance to quickly locate problems, is easy to repair, and has a low replacement cost. It makes the entire system structure three-dimensional, which helps to reduce the size of the entire system and make the system more compact. It is convenient for layout, and the connection method can be adjusted according to the structure to simplify the structural design.

[0035] F2800137 is used as the main control module, which is electrically connected to the main power module 2. The main control module has low cost and complete library functions, which can effectively reduce the workload of understanding, reading and programming the software. The functional pins are all brought out, so it can be used as a main control board for devices with different functions.

[0036] like Figure 2 and Figure 3 As shown, the PFC circuit is connected to the neutral line and the live line, and the AC power is connected from the neutral line and the live line. The PFC bridgeless totem-pole circuit 21 includes a first IGBT tube Q24, a second IGBT tube Q25, a third IGBT tube Q26, and a fourth IGBT tube Q27. The emitter of the first IGBT tube Q24 is electrically connected to the live line, the collector of the first IGBT tube Q24 is electrically connected to the collector of the second IGBT tube Q25, the emitter of the second IGBT tube Q25 is electrically connected to the neutral line and the collector of the third IGBT tube Q26, and the emitter of the third IGBT tube Q26 is electrically connected to the emitter of the fourth IGBT tube Q27 and the neutral line. The PFC bridgeless totem-pole circuit is a circuit topology for power factor correction (PFC). The PFC bridgeless totem-pole circuit 21 improves the power factor of the power supply by improving the input current waveform of the power supply. Traditional bridge rectifier circuits may introduce large harmonics, resulting in a low power factor. However, the PFC bridgeless totem pole circuit 21 can effectively reduce harmonics and improve the power factor of the power supply to make it close to 1. This helps to reduce pollution to the power grid and improve the utilization rate of electric energy.

[0037] The PFC bridgeless totem pole circuit 21 can reduce the loss of the power switch. This circuit structure can realize zero voltage switching (Zero Voltage Switching, ZVS), reduce switching losses during switching operations, and improve the efficiency and reliability of the circuit. Compared with the traditional bridge rectifier circuit, the PFC bridgeless totem pole circuit 21 can achieve a higher power density. This means that a power supply design with a higher power output can be achieved at the same volume and weight. The PFC bridgeless totem pole circuit 21 can also reduce the electromagnetic interference (EMI) generated by the power supply. By reducing harmonics and voltage peaks during the switching process, the occurrence of electromagnetic interference can be reduced, meeting the requirements of electromagnetic compatibility (EMC).

[0038] like Figure 4 As shown, the PFC circuit also includes an IGBT drive circuit, which is connected to the main power module 2 and the control module 1, and is used to provide a gate voltage to the main power module 2. The IGBT (Insulated Gate Bipolar Transistor) drive circuit is used to control and drive the switching operation of the IGBT device. The IGBT drive circuit usually includes signal amplification and isolation functions, which are used to transfer the control signal from the control circuit to the IGBT device, and realize electrical isolation to ensure safety. This isolation can prevent potential electrical noise and interference from affecting the control signal, while protecting the control circuit from high voltage and high current.

[0039] The IGBT drive circuit can control the switching speed of the IGBT device to ensure fast switching when needed to achieve effective power conversion and power control. Through precise switching control, system efficiency can be maximized and energy loss can be reduced.

[0040] IGBT drive circuits usually integrate over-current and over-temperature protection functions to monitor and protect IGBT devices from damage caused by overload and overheating. When an abnormal situation is detected, the drive circuit will cut off the power supply of the device in time, thereby protecting the safe operation of the entire system.

[0041] Through appropriate design and filtering measures, the IGBT drive circuit can effectively suppress noise and electromagnetic interference, ensuring that the system does not generate excessive electromagnetic radiation or interfere with other surrounding equipment when working.

[0042] like Figure 6As shown, the PFC circuit also includes a temperature acquisition circuit, which is connected to the main power module 2 and is used to collect the temperature of the main power module 2. The temperature acquisition circuit is used to measure the temperature of the environment or equipment and convert it into an electrical signal for processing and monitoring by a digital or analog system. The temperature acquisition circuit can monitor the temperature changes of the environment or equipment in real time and convert it into a digital or analog signal output. These signals can be used to control the temperature of the system, such as automatically adjusting the fan speed or controlling the power of the heating element in a thermal management system to maintain the temperature of the system within a safe range. By monitoring the temperature and comparing it with a preset threshold, the temperature acquisition circuit can detect abnormal temperature conditions and issue an alarm or trigger a protection mechanism. This helps to promptly identify possible faults or overheating problems in the system, thereby reducing damage and improving the reliability of the system.

[0043] like Figure 7 As shown, the PFC circuit also includes a cooling fan control circuit, which is connected to the temperature acquisition circuit and the fan. The temperature acquisition circuit acquires the fan temperature to control the fan cooling, perform temperature warnings, reduce power, shut down, and other processing. The cooling fan control circuit is used to control the operation of the cooling fan to effectively adjust the temperature of the device or system and keep it within a safe range. The cooling fan control circuit monitors the temperature of the environment or the device through the temperature acquisition circuit, and automatically adjusts the fan speed according to the preset temperature threshold. When the temperature exceeds the set threshold, the circuit will increase the fan speed to enhance the cooling effect; when the temperature drops to a safe range, the circuit will reduce the fan speed or turn it off to save energy and reduce noise.

[0044] The cooling fan control circuit usually has an overheat protection function, which can detect the overheating of the system or equipment and start the fan in time to accelerate the heat dissipation to prevent equipment damage or safety hazards caused by overheating.

[0045] like Figure 8 As shown, the main power module 2 is provided with a control interface circuit, the control interface circuit is electrically connected to the power supply module 3, the control interface circuit is used to supply power to the power supply module 3, and the main power module 2 also includes a voltage divider sampling circuit, a filter current sampling circuit, a power supply, a PWM and a GPIO control interface circuit that are electrically connected to each other.

[0046] like Fig. 9 As shown, the PFC circuit further includes an isolation circuit, which is connected to the control module 1 and is used to protect the control module 1. The isolation circuit is an optocoupler isolation circuit.

[0047] The utility model adopts an AC-DC control voltage regulator of model UCC28711 through a voltage stabilizing circuit 31. The voltage stabilizing circuit 31 can provide isolated constant voltage (CV) output and constant current (CC) output regulation without using an optical coupler, can process information from the main power module 3 and the auxiliary flyback winding, and accurately control the output voltage and current. It mainly realizes providing auxiliary power for the entire PFC circuit when connected to the main power supply, including a control module 1, a driving circuit on the main power module 2, a sampling circuit (including an operational amplifier circuit), etc. The main power module 2 adopts a bridgeless totem pole topology, including a switching circuit 22, a voltage and current sampling circuit, a driving circuit, and various power supply circuits. The control module 1 mainly adopts a DSP chip of model TMS320F2800137 to realize the voltage and current acquisition and data calculation of the entire circuit, calculate the control data through an algorithm, perform output control through a PWM pin, and perform heat dissipation and function switching through a GPIO pin.

[0048] like Figure 5 As shown, the switching circuit 22 includes a first MOS transistor Q28, a first switch K1B, a first diode D62, and a second diode D63. The drain of the first MOS transistor Q28 is connected to the cathode of the first diode D62 and the first end of the first switch K1B, the anode of the first diode D62 is connected to the anode of the second diode D63, and the cathode of the second diode D63 is connected to the second end of the first switch K1B.

[0049] At least one switching circuit 22 is disposed in the PFC circuit.

[0050] The function of the switching circuit 22 is to switch circuits between different circuits or devices to achieve specific functions or meet specific requirements.

[0051] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A PFC circuit, characterized in that: It includes a power module, a main power module, and a control module. The control module is connected to the power module and the main power module respectively. The control module is used to collect the voltage and current of the PFC circuit. The power module includes a voltage stabilizing circuit. The voltage stabilizing circuit is connected to the control module. The voltage stabilizing circuit is used to stabilize the input voltage. The main power module includes an overcurrent and overvoltage protection circuit, a switching circuit, and a PFC bridgeless totem pole circuit that are electrically connected in sequence. The input current of the PFC circuit flows through the overcurrent and overvoltage protection circuit, the switching circuit, and the PFC bridgeless totem pole circuit in sequence.

2. The PFC circuit according to claim 1, characterized in that: The PFC circuit is connected to the neutral line and the live line, and the PFC bridgeless totem pole circuit includes a first IGBT tube, a second IGBT tube, a third IGBT tube, and a fourth IGBT tube. The emitter of the first IGBT tube is electrically connected to the live line, the collector of the first IGBT tube is electrically connected to the collector of the second IGBT tube, the emitter of the second IGBT tube is electrically connected to the neutral line and the collector of the third IGBT tube, and the emitter of the third IGBT tube is electrically connected to the emitter of the fourth IGBT tube and the neutral line.

3. The PFC circuit according to claim 1, characterized in that: The PFC circuit further includes an IGBT drive circuit, which is connected to the main power module and the control module, and is used to provide a gate voltage to the main power module.

4. The PFC circuit according to claim 1, characterized in that: The PFC circuit further includes a temperature acquisition circuit, which is connected to the main power module and is used to acquire the temperature of the main power module.

5. The PFC circuit according to claim 4, characterized in that: The PFC circuit also includes a heat dissipation fan control circuit, which is connected to the temperature acquisition circuit and the fan, and the temperature acquisition circuit acquires the fan temperature.

6. The PFC circuit according to claim 1, wherein: The main power module is provided with a control interface circuit, the control interface circuit is electrically connected to the power module, and the control interface circuit is used to supply power to the power module.

7. The PFC circuit according to claim 1, wherein: The PFC circuit further includes an isolation circuit, which is connected to the control module and is used to protect the control module.

8. The PFC circuit according to claim 7, characterized in that: The isolation circuit is an optocoupler isolation circuit.

9. The PFC circuit according to claim 1, wherein: The switching circuit includes a first MOS tube, a first switch, a first diode, and a second diode. The drain of the first MOS tube is connected to the cathode of the first diode and the first end of the first switch, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is connected to the second end of the first switch.

10. The PFC circuit according to claim 9, characterized in that: At least one switching circuit is provided in the PFC circuit.

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