Power factor correction circuit, control method, charging device, system and vehicle

Abstract

The invention relates to a power factor correction circuit, a control method, a charging device, a charging system and a vehicle. The power factor correction circuit comprises a first switch, a second switch, a third switch and a power bridge unit, the first switch is electrically connected with a first phase bridge arm in the power bridge unit and used for being electrically connected with a first phase line, the second switch is electrically connected with a second phase bridge arm in the power bridge unit and used for being electrically connected with a second phase line, and the third switch is electrically connected with a third phase bridge arm in the power bridge unit and used for being electrically connected with a third phase line. And a fourth-phase bridge arm in the power bridge unit is used for being electrically connected with a neutral line. According to the power factor correction circuit, the corresponding switches are arranged for the three phase lines of the power grid respectively, so that the unused phase lines can be controlled to be reliably cut off from the power grid through the corresponding switches when the power factor correction circuit works in the single-phase mode, the hidden danger of misconnection does not exist, and the failure risk caused by fluctuation of the power grid is reduced.

Description

Technical Field

[0001] This application relates to the field of power supply management technology, and in particular to a power factor correction circuit, control method, charging device, system and vehicle. Background Technology

[0002] Electric vehicle onboard chargers or external charging stations typically draw energy from the AC power grid and convert it to DC power to charge the battery. Without power factor correction, the onboard charger may generate significant reactive power during this process, reducing grid efficiency. Therefore, current onboard chargers typically include corresponding power factor correction circuits.

[0003] Current power factor correction circuits can operate in both single-phase and three-phase modes simultaneously. However, they have some drawbacks. For example, when operating in single-phase mode, unused phase wires cannot be disconnected from the power grid, posing a risk of misconnection and increasing the risk of failure due to power grid fluctuations. Summary of the Invention

[0004] This application provides a power factor correction circuit, control method, charging device, system, and vehicle. Corresponding switches are set for the three phase lines of the power grid, so that when operating in single-phase mode, the unused phase line can be reliably disconnected from the power grid by the corresponding switch, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a power factor correction circuit is provided, including a first switch, a second switch, a third switch, and a power bridge unit.

[0006] The first switch is electrically connected to the first phase arm of the power bridge unit and is used for electrical connection to the first phase line. The second switch is electrically connected to the second phase arm of the power bridge unit and is used for electrical connection to the second phase line. The third switch is electrically connected to the third phase arm of the power bridge unit and is used for electrical connection to the third phase line. The fourth phase arm of the power bridge unit is used for electrical connection to the neutral line.

[0007] Optionally, the power factor correction circuit may also include a first pre-charge resistor connected in parallel with the first switch.

[0008] Optionally, the power factor correction circuit may also include a second pre-charge resistor connected in parallel with the third switch.

[0009] Optionally, the power factor correction circuit may also include a fourth switch;

[0010] The first access terminal of the fourth switch is electrically connected to the first access terminal of the first switch and is used to electrically connect to the first phase line. The second access terminal of the fourth switch is electrically connected to the second access terminal of the second switch and the second phase bridge arm in the power bridge unit.

[0011] Optionally, the power factor correction circuit may also include a switch control unit;

[0012] The switch control unit is electrically connected to the controlled terminals of the first switch, the second switch, the third switch, and the fourth switch, respectively, and is used to receive control signals. Based on the received control signals, it controls the switching states of the first switch, the second switch, the third switch, and the fourth switch, respectively. At most one of the second and fourth switches can be in the on state.

[0013] Optionally, the switch control unit includes a first AND gate, a second AND gate, a third AND gate, a fourth AND gate, and a NOT gate;

[0014] The first input terminal of the first AND gate is electrically connected to the first input terminals of the second AND gate, the third AND gate, and the fourth AND gate, respectively, and is used to receive the first control signal.

[0015] The output of the first AND gate is electrically connected to the controlled terminal of the first switch; the output of the second AND gate is electrically connected to the controlled terminal of the second switch; the output of the third AND gate is electrically connected to the controlled terminal of the third switch; and the output of the fourth AND gate is electrically connected to the controlled terminal of the fourth switch.

[0016] The second input of the first logic AND gate is used to receive the second control signal;

[0017] The second input of the second AND gate is electrically connected to the input of the NOT gate and is used to receive the third control signal. The output of the NOT gate is electrically connected to the second input of the fourth AND gate.

[0018] The second input of the third AND gate is used to connect the fourth control signal.

[0019] According to a second aspect of this application, a control method is provided, applied to the power factor correction circuit in any of the above embodiments; the control method includes:

[0020] The switching states of the first, second, and third switches are controlled respectively, so that the power factor correction circuit can operate in single-phase or three-phase mode.

[0021] Optionally, the power factor correction circuit further includes a first pre-charge resistor connected in parallel with the first switch; controlling the switching states of the first switch, the second switch, and the third switch respectively, so that the power factor correction circuit operates in single-phase mode or three-phase mode, including:

[0022] The switching states of the first switch, the second switch, and the third switch are respectively controlled to be in the off state, so that the operation of the power factor correction circuit in the pre-charge stage of single-phase mode is controlled by the first pre-charge resistor, the first phase bridge arm and the fourth phase bridge arm in the power bridge unit.

[0023] Optionally, the power factor correction circuit further includes a fourth switch, the first terminal of which is electrically connected to the first terminal of the first switch and is used for electrical connection to the first phase line, and the second terminal of the fourth switch is electrically connected to the second terminal of the second switch and the second phase bridge arm in the power bridge unit, respectively; controlling the switching states of the first switch, the second switch, and the third switch respectively, so that the power factor correction circuit operates in single-phase mode or three-phase mode, including:

[0024] The first and fourth switches are controlled to be in the on state, while the second and third switches are controlled to be in the off state, so as to control the operation of the power factor correction circuit in the positive charging stage of single-phase mode through the first phase bridge arm, the second phase bridge arm and the fourth phase bridge arm in the power bridge unit.

[0025] In this power bridge unit, the first phase bridge arm and the second phase bridge arm work alternately.

[0026] Optionally, the power factor correction circuit further includes a first pre-charge resistor connected in parallel with the first switch and a second pre-charge resistor connected in parallel with the third switch; controlling the switching states of the first switch, the second switch, and the third switch respectively, so that the power factor correction circuit operates in single-phase mode or three-phase mode, including:

[0027] The switching states of the first switch, the second switch, and the third switch are respectively controlled to be in the off state, so that the power factor correction circuit can be controlled to operate in the pre-charge stage of the three-phase mode through the first pre-charge resistor, the second pre-charge resistor, the first phase bridge arm and the third phase bridge arm in the power bridge unit.

[0028] Optionally, the switching states of the first switch, the second switch, and the third switch are controlled respectively to enable the power factor correction circuit to operate in single-phase mode or three-phase mode, including:

[0029] The switching states of the first, second, and third switches are respectively controlled to be in the on state, so that the power factor correction circuit can be controlled to operate in the positive charging stage of the three-phase mode through the first phase bridge arm, the second phase bridge arm, the third phase bridge arm, and the fourth phase bridge arm in the power bridge unit.

[0030] According to a third aspect of this application, a charging device is provided, including a resonant circuit and a power factor correction circuit in any of the above embodiments.

[0031] The power bridge unit in the power factor correction circuit is used to electrically connect to the power battery through a resonant circuit.

[0032] According to a fourth aspect of this application, a power system is provided, including a power battery and a charging device as described in any of the above embodiments.

[0033] According to a fifth aspect of this application, a vehicle is provided, including a power factor correction circuit as described in any of the above embodiments, or including a charging device as described in any of the above embodiments, or including a power system as described in any of the above embodiments.

[0034] The power factor correction circuit in this application sets corresponding switches for each of the three phase lines of the power grid, so that when operating in single-phase mode, the unused phase line can be reliably disconnected from the power grid through the corresponding switch, eliminating the risk of misconnection and reducing the risk of failure caused by power grid fluctuations.

[0035] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0038] Figure 1 This is a schematic diagram of the power factor correction circuit provided in an exemplary embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the power factor correction circuit provided in the exemplary embodiment of this application, which further includes a first pre-charge resistor, a second pre-charge resistor, and a fourth switch.

[0040] Figure 3 This is a schematic diagram of the structure of the switch control unit provided in an exemplary embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the pre-charge stage in a single-phase mode provided in an exemplary embodiment of this application;

[0042] Figure 5 This is a schematic diagram of the positive charge phase in a single-phase mode provided in an exemplary embodiment of this application;

[0043] Figure 6This is a schematic diagram of the pre-charge stage in the three-phase mode provided in the exemplary embodiment of this application;

[0044] Figure 7 This is a schematic diagram of the positive charge stage in the three-phase mode provided in an exemplary embodiment of this application;

[0045] Figure 8 This is a schematic diagram of the structure of the charging device provided in an exemplary embodiment of this application;

[0046] Figure 9 This is a schematic diagram of the power system provided in an exemplary embodiment of this application. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0048] According to a first aspect of this application, a power factor correction circuit is provided, including a first switch, a second switch, a third switch, and a power bridge unit.

[0049] Among them, such as Figure 1 As shown, the first switch includes a relay RL1, the second switch includes a relay RL2, the third switch includes a relay RL3, and the power bridge unit includes a first phase bridge arm composed of switching transistors Q1 and Q2, a second phase bridge arm composed of switching transistors Q3 and Q4, a third phase bridge arm composed of switching transistors Q5 and Q6, and a fourth phase bridge arm composed of switching transistors Q7 and Q8.

[0050] The first terminal of relay RL1 is used to be electrically connected to the first phase line A, the second terminal of relay RL1 is electrically connected to the midpoint of the first phase bridge arm in the power bridge unit (i.e., the common terminal of switch Q1 and switch Q2), and the controlled terminal of relay RL1 is used to connect to the first drive signal KL1.

[0051] The first terminal of relay RL2 is used to be electrically connected to the second phase line B. The second terminal of relay RL2 is electrically connected to the midpoint of the second phase bridge arm in the power bridge unit (i.e., the common terminal of switch Q3 and switch Q4). The controlled terminal of relay RL2 is used to connect to the second drive signal KL2.

[0052] The first terminal of relay RL3 is used to connect to the third phase line C. The second terminal of relay RL3 is connected to the midpoint of the third phase bridge arm in the power bridge unit (i.e., the common terminal of switch Q5 and switch Q6). The controlled terminal of relay RL3 is used to connect to the third drive signal KL3.

[0053] The midpoint of the fourth phase arm in the power bridge unit (i.e., the common terminal of switch Q7 and switch Q8) is used for electrical connection with the neutral line N.

[0054] Since the first phase line A, the second phase line B, and the third phase line C are electrically connected to the power bridge unit through corresponding relays, when operating in single-phase mode, the relay corresponding to the used phase line can be turned on while the other relays are turned off, thus ensuring that the unused phase line is reliably disconnected from the power grid.

[0055] Specifically, refer to Figure 1 If the first phase line A is used to implement the single-phase mode, then control relay RL1 is turned on and relays RL2 and RL3 are turned off; if the second phase line B is used to implement the single-phase mode, then control relay RL2 is turned on and relays RL1 and RL3 are turned off; if the third phase line C is used to implement the single-phase mode, then control relay RL3 is turned on and relays RL1 and RL2 are turned off.

[0056] It is understood that in other embodiments, the first switch, the second switch, and the third switch may also be other types of switching devices, such as contactors.

[0057] As a supplement, in this embodiment, relays RL1, RL2 and RL3 are of the same model and specifications, which can effectively balance the impedance of each phase line and minimize the error caused by the impedance difference of the phase line in voltage and current sampling.

[0058] The power factor correction circuit in this application sets corresponding switches for each of the three phase lines of the power grid, so that when operating in single-phase mode, the unused phase line can be reliably disconnected from the power grid through the corresponding switch, eliminating the risk of misconnection and reducing the risk of failure caused by power grid fluctuations.

[0059] like Figure 2 As shown, optionally, the power factor correction circuit also includes a first switch (such as...). Figure 2 The first pre-charge resistor PTC1 is connected in parallel with the relay RL2 in the middle.

[0060] The first pre-charge resistor PTC1 is used to limit the current in its current loop, typically during the charging start-up phase. Specifically, when using the first phase line A to implement single-phase mode, relay RL1 is initially kept off, allowing current to flow through the first pre-charge resistor PTC1. Due to the current-limiting effect of PTC1, the charging current is small, ultimately allowing the energy storage capacitor CE1 to charge with a small current, preventing damage from sudden current changes. Once the energy storage capacitor CE1 is fully charged, relay RL1 is then turned on, allowing current to flow through it. Because the first pre-charge resistor PTC1 is short-circuited, the charging current is larger, enabling more efficient power supply to subsequent stages.

[0061] like Figure 2 As shown, optionally, the power factor correction circuit also includes a third switch (such as...). Figure 2 The second pre-charge resistor PTC2 is connected in parallel with the relay RL3 in the middle.

[0062] Similarly, the second pre-charge resistor PTC2 is also used to limit the current in its current loop.

[0063] Specifically, when using the third phase line C to implement single-phase mode, relay RL3 is first kept off, allowing current to flow through the second pre-charge resistor PTC2. Due to the current-limiting effect of PTC2, the charging current is small, ultimately allowing the energy storage capacitor CE1 to charge with a small current, avoiding damage due to sudden current changes. This process can be understood as the pre-charge stage. Once the energy storage capacitor CE1 is fully charged (i.e., the pre-charge stage is complete), relay RL3 is then turned on, allowing current to flow through it. Because PTC2 is short-circuited, the charging current is larger, enabling more efficient power supply to subsequent stages. This process can be understood as the positive charge stage.

[0064] Furthermore, when both the first pre-charge resistor PTC1 and the second pre-charge resistor PTC2 are present, the pre-charge stage in three-phase mode can be reliably implemented. When using the first phase line A and the third phase line C to implement the pre-charge stage in three-phase mode, relays RL1 and RL3 are kept off first, allowing current to flow through the first pre-charge resistor PTC1 and the second pre-charge resistor PTC2. Due to the current limiting effect of the first and second pre-charge resistors PTC1 and PTC2, the charging current is small, ultimately allowing the energy storage capacitor CE1 to be charged with a small current, avoiding damage due to sudden current changes. After the energy storage capacitor CE1 is fully charged, relays RL1 and RL3 are turned on, allowing current to flow through them. Because the first and second pre-charge resistors PTC1 and PTC2 are short-circuited, the charging current is larger, thus enabling higher efficiency power supply to subsequent stages.

[0065] like Figure 2 As shown, optionally, the power factor correction circuit also includes a fourth switch (such as...). Figure 2 (Relay RL4 in the middle).

[0066] The first access terminal of relay RL4 is electrically connected to the first access terminal of relay RL1 and is used to electrically connect to the first phase line A. The second access terminal of relay RL4 is electrically connected to the second access terminal of relay RL2 and the midpoint of the second phase bridge arm in the power bridge unit (such as the common terminal of switch Q3 and switch Q4). The controlled terminal of relay RL4 is used to access the fourth drive signal KL4.

[0067] When the first phase line A is used to implement the single-phase mode, if the relay RL4 is turned on, the current output by the first phase line A can pass through the relays RL1 and RL2 respectively, so that the first phase bridge arm and the second phase bridge arm in the power bridge unit can be used at the same time. This allows the first phase bridge arm and the second phase bridge arm to reduce the load by shunting, thereby improving the reliability of the power bridge unit.

[0068] In addition to the first, second, and third switches mentioned above, in other embodiments, the fourth switch may also be other specific types of switching devices, such as contactors.

[0069] As a supplement, the type and specifications of relay RL4 are the same as those of relays RL1, RL2 and RL3 mentioned above, so that the impedance of the two circuits is the same when the first phase bridge arm and the second phase bridge arm work alternately in single-phase mode.

[0070] It should be noted that when the first phase bridge arm and the second phase bridge arm work alternately, the current on the neutral line N is the sum of the current of the first phase bridge arm and the second phase bridge arm. If a corresponding relay is to be installed on the neutral line N, the current carrying capacity of the relay needs to be twice that of relay RL1 and relay RL2, which leads to complicated selection.

[0071] Optionally, the power factor correction circuit may also include a switching control unit.

[0072] Among them, reference Figure 2 Switch control unit ( Figure 2 (Not shown) is electrically connected to the controlled terminals of relays RL1, RL2, RL3, and RL4 respectively and is used to receive control signals. According to the received control signals, it outputs a first drive signal KL1, a second drive signal KL2, a third drive signal KL3, and a fourth drive signal KL4 to relays RL1, RL2, RL3, and RL4 respectively to control the switching states of relays RL1, RL2, RL3, and RL4.

[0073] It is important to note that the switching states of relays RL2 and RL4 are mutually exclusive; that is, at most one of relays RL2 and RL4 can be in the on state. Understandably, if relays RL2 and RL4 are both on, it would cause a short circuit between the first phase line A and the second phase line B, posing a significant safety hazard. Therefore, in this embodiment, the switch control unit can use the output second drive signal KL2 and the fourth drive signal KL4 to ensure that only one of relays RL2 or RL4 is on, or both are off. When relay RL2 is on, relay RL4 is off; when relay RL4 is on, relay RL2 is off.

[0074] like Figure 3 As shown, optionally, the switch control unit includes a first AND gate U1, a second AND gate U2, a third AND gate U3, a fourth AND gate U4, and a NOT gate U5.

[0075] The first input terminal of the first logic AND gate U1 is electrically connected to the first input terminals of the second logic AND gate U2, the third logic AND gate U3, and the fourth logic AND gate U4, respectively, and is used to receive the first control signal CL1.

[0076] The output of the first logic AND gate U1 is connected to the first switch (e.g., ...). Figure 2 The controlled terminal of the relay RL1 is electrically connected to output the first drive signal KL1. The output terminal of the second logic AND gate U2 is connected to the second switch (such as...). Figure 2 The controlled terminal of the relay RL2 is electrically connected to output the second drive signal KL2. The output of the third logic AND gate U3 is connected to the third switch (such as...). Figure 2 The controlled terminal of the relay RL3 is electrically connected to output the third drive signal KL3. The output of the fourth logic AND gate U4 is connected to the fourth switch (such as...). Figure 2 The controlled terminal of the relay RL4 is electrically connected to output the fourth drive signal KL4.

[0077] The second input of the first logic AND gate U1 is used to receive the second control signal CL2.

[0078] Specifically, when the first control signal CL1 is high and the second control signal CL2 is high, the first logic AND gate U1 outputs a high-level first drive signal KL1; otherwise, the first logic AND gate U1 outputs a low-level first drive signal KL1.

[0079] The second input of the second AND gate U2 is electrically connected to the input of the NOT gate U5 and is used to receive the third control signal CL3. The output of the NOT gate U5 is electrically connected to the second input of the fourth AND gate U4.

[0080] Specifically, when the first control signal CL1 is high and the third control signal CL3 is high, the second AND gate U2 outputs a high-level second drive signal KL2 and the fourth AND gate U4 outputs a low-level fourth drive signal KL4; when the first control signal CL1 is high and the third control signal CL3 is low, the second AND gate U2 outputs a low-level second drive signal KL2 and the fourth AND gate U4 outputs a high-level fourth drive signal KL4; when the first control signal CL1 is low, the second AND gate U2 outputs a low-level second drive signal KL2 and the fourth AND gate U4 outputs a low-level fourth drive signal KL4.

[0081] The second input of the third logic AND gate U3 is used to connect the fourth control signal CL4.

[0082] Specifically, when the first control signal CL1 is high and the fourth control signal CL4 is high, the third logic AND gate U3 outputs a high-level third drive signal KL3; otherwise, the third logic AND gate U3 outputs a low-level third drive signal KL3.

[0083] This embodiment achieves more reliable mutual exclusion control by using AND gates and NOT gates on the basis of using four control signals.

[0084] According to a second aspect of this application, a control method is provided, applied to the power factor correction circuit in any of the above embodiments; the control method includes:

[0085] The switching states of the first, second, and third switches are controlled respectively, so that the power factor correction circuit can operate in single-phase or three-phase mode.

[0086] The power factor correction circuit used in the control method of this application sets corresponding switches for the three phase lines of the power grid, so that when operating in single-phase mode, the unused phase line can be reliably disconnected from the power grid through the corresponding switch, eliminating the risk of misconnection and reducing the risk of failure caused by power grid fluctuations.

[0087] like Figure 4 As shown, optionally, the switching states of the first switch, the second switch, and the third switch are controlled respectively to make the power factor correction circuit operate in single-phase mode or three-phase mode, including:

[0088] Taking relays as an example, the switching states of relays RL1, RL2, RL3 and RL4 are controlled to be off, so that the power factor correction circuit can be controlled to operate in the pre-charge stage of single-phase mode through the first pre-charge resistor PTC1, the first phase bridge arm and the fourth phase bridge arm in the power bridge unit.

[0089] Among them, the current loop is as follows Figure 4 The red line in the diagram originates from the first phase line A, passes sequentially through the first pre-charge resistor PTC1, the switch Q1, the energy storage capacitor CE1, and the switch Q8, and returns to the neutral line N.

[0090] like Figure 5 As shown, optionally, the switching states of the first switch, the second switch, and the third switch are controlled respectively to make the power factor correction circuit operate in single-phase mode or three-phase mode, including:

[0091] Taking relays as an example, the switching states of relays RL1 and RL4 are controlled to be in the on state, while the switching states of relays RL2 and RL3 are controlled to be in the off state, so that the power factor correction circuit can be controlled to operate in the positive charging stage of single-phase mode through the first phase bridge arm, the second phase bridge arm and the fourth phase bridge arm in the power bridge unit.

[0092] In this power bridge unit, the first phase bridge arm and the second phase bridge arm work alternately.

[0093] Among them, the current loop is as follows Figure 5 The red line in the diagram starts from the first phase line A, passes through relays RL1 and RL4, switching transistors Q1 and Q3, energy storage capacitor CE1 and switching transistor Q8, and returns to the neutral line N.

[0094] In this embodiment, the first phase bridge arm and the second phase bridge arm work alternately, which can achieve current diversion, reduce their respective loads, and thus improve reliability.

[0095] like Figure 6 As shown, optionally, the switching states of the first switch, the second switch, and the third switch are controlled respectively to make the power factor correction circuit operate in single-phase mode or three-phase mode, including:

[0096] Taking relays as an example, the switching states of relays RL1, RL2, RL3 and RL4 are controlled to be off, so that the power factor correction circuit can be controlled to operate in the pre-charge stage of three-phase mode through the first pre-charge resistor PTC1, the second pre-charge resistor PTC2, the first phase bridge arm and the third phase bridge arm in the power bridge unit.

[0097] Among them, the current loop is as follows Figure 6 The red line in the diagram originates from the first phase line A, passes sequentially through the first pre-charge resistor PTC1, the switch Q1, the energy storage capacitor CE1, and the switch Q6, and returns to the third phase line C.

[0098] like Figure 7 As shown, optionally, the switching states of the first switch, the second switch, and the third switch are controlled respectively to make the power factor correction circuit operate in single-phase mode or three-phase mode, including:

[0099] Taking relays as an example, the switching states of relays RL1, RL2, and RL3 are controlled to be in the on state, while the switching state of relay RL4 is controlled to be in the off state. This allows the power factor correction circuit to operate in the positive charging phase of the three-phase mode through the first phase bridge arm, the second phase bridge arm, the third phase bridge arm, and the fourth phase bridge arm in the power bridge unit.

[0100] In the three-phase mode, it is equivalent to the first phase line A, the second phase line B, and the third phase line C simultaneously realizing the corresponding single-phase mode. For specific details, please refer to the above embodiment, which will not be repeated here.

[0101] According to the third aspect of this application, such as Figure 8 As shown, a charging device is provided, including a resonant circuit and a power factor correction circuit in any of the above embodiments;

[0102] The power bridge unit in the power factor correction circuit is used to electrically connect to the power battery through a resonant circuit.

[0103] The power factor correction circuit included in the charging device of this application sets corresponding switches for the three phase lines of the power grid, so that when operating in single-phase mode, the unused phase line can be reliably disconnected from the power grid through the corresponding switch, eliminating the risk of misconnection and reducing the risk of failure caused by power grid fluctuations.

[0104] According to the fourth aspect of this application, such as Figure 9 As shown, a power system is provided, including a power battery and a charging device in any of the above embodiments.

[0105] The power factor correction circuit included in the power system of this application sets corresponding switches for the three phase lines of the power grid, so that when operating in single-phase mode, the unused phase line can be reliably disconnected from the power grid through the corresponding switch, eliminating the risk of misconnection and reducing the risk of failure caused by power grid fluctuations.

[0106] According to a fifth aspect of this application, a vehicle is provided, including a power factor correction circuit as described in any of the above embodiments, or including a charging device as described in any of the above embodiments, or including a power system as described in any of the above embodiments.

[0107] The power factor correction circuit included in the vehicle of this application sets corresponding switches for the three phase lines of the power grid, so that when operating in single-phase mode, the unused phase line can be reliably disconnected from the power grid through the corresponding switch, eliminating the risk of misconnection and reducing the risk of failure caused by power grid fluctuations.

[0108] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0109] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0110] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0111] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. In the embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant content of other embodiments. Any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power factor correction circuit, characterized in that, It includes a first switch, a second switch, a third switch, and a power bridge unit; The first switch is electrically connected to the first phase arm of the power bridge unit and is used for electrical connection to the first phase line; the second switch is electrically connected to the second phase arm of the power bridge unit and is used for electrical connection to the second phase line; the third switch is electrically connected to the third phase arm of the power bridge unit and is used for electrical connection to the third phase line; and the fourth phase arm of the power bridge unit is used for electrical connection to the neutral line.

2. The power factor correction circuit according to claim 1, characterized in that, The power factor correction circuit also includes a first pre-charge resistor connected in parallel with the first switch.

3. The power factor correction circuit according to claim 2, characterized in that, The power factor correction circuit also includes a second pre-charge resistor connected in parallel with the third switch.

4. The power factor correction circuit according to claim 1, characterized in that, The power factor correction circuit also includes a fourth switch; The first access terminal of the fourth switch is electrically connected to the first access terminal of the first switch and is used to electrically connect to the first phase line. The second access terminal of the fourth switch is electrically connected to the second access terminal of the second switch and the second phase bridge arm in the power bridge unit.

5. The power factor correction circuit according to claim 4, characterized in that, The power factor correction circuit also includes a switch control unit; The switch control unit is electrically connected to the controlled terminals of the first switch, the second switch, the third switch, and the fourth switch, respectively, and is used to receive control signals. Based on the received control signals, it controls the switching states of the first switch, the second switch, the third switch, and the fourth switch, respectively. At most one of the second switch and the fourth switch is in the on state.

6. The power factor correction circuit according to claim 5, characterized in that, The switch control unit includes a first AND gate, a second AND gate, a third AND gate, a fourth AND gate, and a NOT gate; The first input terminal of the first AND gate is electrically connected to the first input terminal of the second AND gate, the first input terminal of the third AND gate, and the first input terminal of the fourth AND gate, respectively, and is used to receive the first control signal; The output of the first AND gate is electrically connected to the controlled terminal of the first switch, the output of the second AND gate is electrically connected to the controlled terminal of the second switch, the output of the third AND gate is electrically connected to the controlled terminal of the third switch, and the output of the fourth AND gate is electrically connected to the controlled terminal of the fourth switch. The second input terminal of the first logical AND gate is used to receive the second control signal; The second input terminal of the second AND gate is electrically connected to the input terminal of the NOT gate and is used to receive the third control signal; the output terminal of the NOT gate is electrically connected to the second input terminal of the fourth AND gate. The second input of the third logical AND gate is used to receive the fourth control signal.

7. A control method, characterized in that, The control method is applied to the power factor correction circuit according to any one of claims 1 to 6; the control method includes: The switching states of the first switch, the second switch, and the third switch are controlled respectively to enable the power factor correction circuit to operate in single-phase mode or three-phase mode.

8. The control method according to claim 7, characterized in that, The power factor correction circuit further includes a first pre-charge resistor connected in parallel with the first switch; the step of controlling the switching states of the first switch, the second switch, and the third switch respectively, so that the power factor correction circuit operates in single-phase mode or three-phase mode, includes: The first switch, the second switch, and the third switch are respectively controlled to be in the off state, so that the power factor correction circuit can be controlled to operate in the pre-charge stage of single-phase mode through the first pre-charge resistor, the first phase bridge arm and the fourth phase bridge arm in the power bridge unit.

9. The control method according to claim 7, characterized in that, The power factor correction circuit further includes a fourth switch, the first access terminal of the fourth switch is electrically connected to the first access terminal of the first switch and is used to electrically connect to the first phase line, and the second access terminal of the fourth switch is electrically connected to the second access terminal of the second switch and the second phase bridge arm in the power bridge unit, respectively. The step of controlling the switching states of the first switch, the second switch, and the third switch respectively, so that the power factor correction circuit operates in single-phase mode or three-phase mode, includes: The first switch and the fourth switch are respectively controlled to be in the on state and the second switch and the third switch are in the off state, so as to control the power factor correction circuit to operate in the positive charging stage of single-phase mode through the first phase bridge arm, the second phase bridge arm and the fourth phase bridge arm in the power bridge unit. In this power bridge unit, the first phase bridge arm and the second phase bridge arm work alternately.

10. The control method according to claim 7, characterized in that, The power factor correction circuit further includes a first pre-charge resistor connected in parallel with the first switch and a second pre-charge resistor connected in parallel with the third switch; the step of controlling the switching states of the first switch, the second switch, and the third switch respectively, so that the power factor correction circuit operates in single-phase mode or three-phase mode, includes: The first switch, the second switch, and the third switch are respectively controlled to be in the off state, so that the power factor correction circuit can be controlled to operate in the pre-charge stage of three-phase mode through the first pre-charge resistor, the second pre-charge resistor, the first phase bridge arm and the third phase bridge arm in the power bridge unit.

11. The control method according to claim 7, characterized in that, The step of controlling the switching states of the first switch, the second switch, and the third switch respectively, so that the power factor correction circuit operates in single-phase mode or three-phase mode, includes: The first switch, the second switch, and the third switch are respectively controlled to be in the on state, so that the power factor correction circuit can be controlled to operate in the positive charging stage of the three-phase mode through the first phase bridge arm, the second phase bridge arm, the third phase bridge arm, and the fourth phase bridge arm in the power bridge unit.

12. A charging device, characterized in that, Includes a resonant circuit and a power factor correction circuit as described in any one of claims 1 to 6; The power bridge unit in the power factor correction circuit is used to be electrically connected to the power battery through the resonant circuit.

13. A power system, characterized in that, It includes a power battery and the charging device as described in claim 12.

14. A vehicle, characterized in that, It includes the power factor correction circuit according to any one of claims 1 to 6, or the charging device according to claim 12, or the power system according to claim 13.

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