Load power supply control circuit and alternating-current charge-discharge device

Abstract

The present application discloses a load power supply control circuit and an alternating-current charge-discharge device. The load power supply control circuit comprises a charge-discharge circuit, an electricity metering circuit, and a main control circuit. The charge-discharge circuit is connected to a power supply grid and a charge-discharge load, performs charging and discharging processing on the charge-discharge load, and outputs charge-discharge information. The electricity metering circuit is connected to the power supply grid and a power consumption load, and measures first power consumption information of the power supply grid and second power consumption information of the power consumption load. The main control circuit is connected to the power supply grid and the power consumption load, and is connected to the charge-discharge circuit and the electricity metering circuit, and, on the basis of the first power consumption information, the second power consumption information, and the charge-discharge information, controls the power supply grid or the charge-discharge circuit to supply power to the power consumption load, and / or controls the charge-discharge circuit to supply power to the charge-discharge load. The present technical solution enables dynamic adjustment of the usage of the power consumption load and the charging period, discharging period, and charge-discharge power of the charge-discharge load, thereby achieving reasonable and balanced allocation of power supply energy and improving energy utilization efficiency.

Description

Load power supply control circuit and AC charging and discharging equipment

[0001] This application is based on and claims priority to Chinese Invention Application No. 202410699448.0, filed on May 31, 2024, entitled "Load Power Supply Control Circuit and AC Charging and Discharging Device". Technical Field

[0002] This application relates to the field of charging and discharging equipment technology, and in particular to a load power supply control circuit and an AC charging and discharging device. Background Technology

[0003] With social development and technological progress, people's demand for energy, especially electricity, is constantly increasing. However, as people's electricity demand increases, how to improve energy efficiency and balance electricity load to meet people's needs for energy and environmental protection has become an urgent technical problem to be solved.

[0004] Application content

[0005] This application provides a load power supply control circuit and an AC charging and discharging device to solve the problems of low energy utilization and unbalanced power load in existing systems.

[0006] A load power supply control circuit includes a charging and discharging circuit, an electricity metering circuit, and a main control circuit;

[0007] The charging and discharging circuit is used to connect the power grid and the charging and discharging load, to perform charging and discharging processing on the charging and discharging load, and to output charging and discharging information.

[0008] The electricity metering circuit is used to connect the power grid and the electrical load, and is used to measure the first electricity consumption information of the power grid and the second electricity consumption information of the electrical load.

[0009] The main control circuit is used to connect the power grid and the electrical load, and is connected to the charging and discharging circuit and the electricity metering circuit. It is used to control the power grid or the charging and discharging circuit to supply power to the electrical load, and / or control the charging and discharging circuit to supply power to the charging and discharging load, based on the first electricity consumption information, the second electricity consumption information and the charging and discharging information.

[0010] Furthermore, the charging and discharging circuit is used to detect the interface signal corresponding to the charging and discharging load, and output charging and discharging information to the main control circuit according to the interface signal; and to perform charging and discharging processing on the charging and discharging load in response to the charging and discharging control signal output by the main control circuit.

[0011] Furthermore, the electricity metering circuit includes a first electricity metering circuit and a second electricity metering circuit;

[0012] The input terminal of the first electricity metering circuit is used to connect to the power grid, and the output terminal of the first electricity metering circuit is connected to the main control circuit to output the first electricity consumption information.

[0013] The input terminal of the second electricity metering circuit is used to connect to the electrical load, and the output terminal of the second electricity metering circuit is connected to the main control circuit to output the second electricity consumption information.

[0014] Furthermore, the main control circuit includes a first switching circuit, a second switching circuit, and a main control chip;

[0015] The first input terminal of the first switching circuit is used to connect to the power grid, the second input terminal of the first switching circuit is connected to the charging and discharging circuit, the output terminal of the first switching circuit is connected to the input terminal of the second switching circuit, and the output terminal of the second switching circuit is used to connect to the electrical load.

[0016] The main control chip is connected to the charging and discharging circuit, the electricity metering circuit, the first switching circuit, and the second switching circuit. It is used to control the power grid or the charging and discharging circuit to supply power to the electrical load based on the first electricity consumption information, the second electricity consumption information, and the charging and discharging information, and / or control the charging and discharging circuit to supply power to the charging and discharging load.

[0017] Furthermore, the main control chip is also used for,

[0018] Based on the first power consumption information and the discharge information, control the operation of the charging and discharging circuit and the first switching circuit;

[0019] Based on the discharge information and the second power consumption information, the charging and discharging circuit and the second switching circuit are controlled to operate.

[0020] Furthermore, the main control circuit includes at least two second switching circuits, the first terminal of each second switching circuit is connected to the output terminal of the first switching circuit, and the second terminal of each second switching circuit is connected to an electrical load.

[0021] The main control chip is used to control the operation of the charging and discharging circuit and the second switching circuit according to the discharge information, the second power consumption information and the preset load priority.

[0022] Furthermore, the main control chip is also used for,

[0023] Based on the first power consumption information and the discharge information, determine whether the power grid supply conditions are met;

[0024] If the power grid supply conditions are met, the first switching circuit is controlled to connect the power grid and the second switching circuit, and the charging and discharging circuit is controlled to charge the charging and discharging load according to the second power consumption information.

[0025] If the power supply conditions of the power grid are not met, the first switching circuit is controlled to turn on the charging and discharging circuit and the second switching circuit, and the second switching circuit is controlled to turn on or off the electrical load according to the discharge information and the second power consumption information. When the second switching circuit is turned on, the charging and discharging circuit is controlled to discharge the electrical load.

[0026] Furthermore, the first switching circuit includes a dual-power converter;

[0027] The first input terminal of the dual power converter is used to connect to the power grid, the second input terminal of the dual power converter is connected to the charging and discharging circuit, and the output terminal of the dual power converter is connected to the input terminal of the second switching circuit.

[0028] Furthermore, the second switching circuit includes a first transistor and a first relay; the first relay includes a normally closed moving contact, a normally closed stationary contact, and a coil;

[0029] The normally closed moving contact is used to connect to the power grid, and the normally closed stationary contact is used to connect to the electrical load; the first end of the coil is used to connect to the first power supply end, the second end of the coil is connected to the first end of the first transistor, the second end of the first transistor is grounded, and the third end of the first transistor is coupled to the main control chip.

[0030] An AC charging and discharging device includes the aforementioned load power supply control circuit.

[0031] The aforementioned load power supply control circuit and AC charging / discharging equipment include a charging / discharging circuit, an electricity metering circuit, and a main control circuit. The charging / discharging circuit connects to the power grid and the charging / discharging load, performs charging / discharging processing on the load, and outputs charging / discharging information. The electricity metering circuit connects to the power grid and the load, and measures the first electricity consumption information of the power grid and the second electricity consumption information of the load. The main control circuit connects to the power grid and the load, and is also connected to the charging / discharging circuit and the electricity metering circuit. Based on the first electricity consumption information, the second electricity consumption information, and the charging / discharging information, the main control circuit controls the power grid or the charging / discharging circuit to supply power to the load, and / or controls the charging / discharging circuit to supply power to the load. This allows for dynamic adjustment of the load's usage and the charging / discharging period, charging / discharging period, and charging / discharging power, achieving a reasonable and balanced distribution of power supply energy to the load and improving energy utilization. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application 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.

[0033] Figure 1 is a circuit diagram of a load power supply control circuit in one embodiment of this application;

[0034] Figure 2 is a circuit diagram of a voltage metering circuit in one embodiment of this application;

[0035] Figure 3 is a circuit diagram of a current metering circuit in one embodiment of this application;

[0036] Figure 4 is a circuit diagram of a second switching circuit in one embodiment of this application.

[0037] In the diagram: 10, charging and discharging circuit; 20, electricity metering circuit; 21, first electricity metering circuit; 22, second electricity metering circuit; 30, main control circuit; 31, first switching circuit; 32, second switching circuit; 33, main control chip; 40, charging and discharging load; 50, electricity load. Detailed Implementation

[0038] 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] It should be understood that this application can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this application to those skilled in the art.

[0040] To fully understand this application, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed in this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0041] This embodiment provides a load power supply control circuit applied in a load power supply system, which includes a charging / discharging load 40, an electrical load 50, and an AC charging / discharging device. Exemplarily, the load power supply control circuit is applied in the AC charging / discharging device. Exemplarily, the AC charging / discharging device is connected to the power grid, the charging / discharging load 40, and the electrical load 50, and is used to dynamically adjust the usage of the electrical load 50 and the charging / discharging period, discharging period, and charging / discharging power of the charging / discharging load 40 according to the actual power supply conditions of the power grid and the charging / discharging load 40, and the actual power consumption conditions of the electrical load 50, thereby achieving a reasonable and balanced distribution of power supply energy to the electrical load 50 and the charging / discharging load 40, and improving energy utilization efficiency.

[0042] For example, the charge / discharge load 40 is a load capable of charging and discharging, such as new energy vehicles or energy storage batteries. The electrical load 50 includes household appliances, such as televisions, air conditioners, and refrigerators.

[0043] This embodiment provides a load power supply control circuit, including a charging / discharging circuit 10, an electricity metering circuit 20, and a main control circuit 30. The charging / discharging circuit 10 is used to connect the power grid and the charging / discharging load 40, and is used to perform charging / discharging processing on the charging / discharging load 40 and output charging / discharging information. The electricity metering circuit 20 is used to connect the power grid and the electricity load 50, and is used to measure the first electricity consumption information of the power grid and the second electricity consumption information of the electricity load 50. The main control circuit 30 is used to connect the power grid and the electricity load 50, and is connected to the charging / discharging circuit 10 and the electricity metering circuit 20, and is used to control the power grid or the charging / discharging circuit 10 to supply power to the electricity load 50, and / or control the charging / discharging circuit 10 to supply power to the charging / discharging load 40, according to the first electricity consumption information, the second electricity consumption information, and the charging / discharging information.

[0044] As an example, the charging / discharging circuit 10 is used to connect the power grid and the charging / discharging load 40, and to perform charging / discharging processing on the charging / discharging load 40, outputting charging / discharging information. This charging / discharging information includes charging information and discharging information. The power grid is generally the national power grid. The charging / discharging circuit 10 can utilize a first AC signal provided by the power grid to output a first DC signal to charge the charging / discharging load 40, and detect charging information during the charging process. Exemplarily, this charging information includes, but is not limited to, charging current, charging voltage, and charging power. Exemplarily, the charging / discharging circuit 10 can also utilize a second DC signal provided by the charging / discharging load 40 to output a second AC signal, which is used to supply power to household loads. It should be noted that the charging / discharging circuit 10 performs charging / discharging processing on the charging / discharging load 40 according to the control of the main control circuit 30. In this embodiment, when the main control circuit 30 determines that the power grid is in a peak electricity consumption period, it controls the charging / discharging circuit 10 to discharge the charging / discharging load 40, so as to supply power to the electrical load 50 based on the charging / discharging load 40. When the main control circuit 30 determines that the power grid is not in the peak electricity consumption period, it controls the charging and discharging circuit 10 to charge the charging and discharging load 40 to improve energy utilization.

[0045] As an example, the electricity metering circuit 20 is used to connect the power grid and the electrical load 50, and to measure first electricity consumption information of the power grid and second electricity consumption information of the electrical load 50. The first electricity consumption information is the total electricity consumption information of all electrical loads 50 measured from the power grid. The second electricity consumption information is the electricity consumption information corresponding to a single electrical load 50. It can be understood that there can be one or more electrical loads 50. When there is only one electrical load 50, the first and second electricity consumption information are the same. When there are multiple electrical loads 50, the sum of the second electricity consumption information corresponding to each electrical load 50 is the first electricity consumption information. Exemplarily, the electricity consumption information includes, but is not limited to, information such as voltage, current, and power. In this embodiment, the electricity metering circuit 20 measures the first electricity consumption information of the power grid and the second electricity consumption information of the electrical load 50, so that the main control circuit 30 can analyze the first electricity consumption information, the second electricity consumption information and the charging and discharging information, and control the power grid or the charging and discharging circuit 10 to supply power to the electrical load 50, and / or control the charging and discharging circuit 10 to supply power to the charging and discharging load 40. This enables dynamic adjustment of the usage of the electrical load 50 and the charging and discharging period and charging and discharging power of the charging and discharging load 40, so as to achieve a reasonable and balanced distribution of power supply energy to the electrical load 50 and the charging and discharging load 40, and improve energy utilization.

[0046] In one embodiment, the charging and discharging circuit 10 is used to detect the interface signal corresponding to the charging and discharging load, and output charging and discharging information to the main control circuit 30 according to the interface signal; and to perform charging and discharging processing on the charging and discharging load in response to the charging and discharging control signal output by the main control circuit 30.

[0047] As an example, the charging / discharging circuit 10 is connected to the charging / discharging load via a charging / discharging interface. For example, the charging / discharging load is a new energy vehicle, which is connected to the charging / discharging interface of the charging / discharging circuit 10 via a charging gun. The interface signal is the signal detected by the charging / discharging interface. Exemplarily, different charging detection resistors and discharging detection resistors are set on the charging / discharging interface. When the circuit containing the charging detection resistor is closed, the charging / discharging load is detected to need to enter charging mode, and charging information is output to the main control circuit 30. The main control circuit 30 outputs a charging control signal to the charging / discharging circuit 10 based on the charging information. The charging / discharging circuit 10 controls the charging / discharging load to charge according to the charging control signal. Exemplarily, the charging information includes the current voltage of the charging / discharging load and the model parameters of the charging / discharging load. The charging control signal includes the charging power. Exemplarily, when the circuit containing the discharging detection resistor is closed, the charging / discharging load is detected to need to enter discharging mode, and discharging information is output to the main control circuit 30. The main control circuit 30 outputs a discharging control signal to the charging / discharging circuit 10 based on the discharging information. The charging / discharging circuit 10 controls the charging / discharging load to discharge according to the discharging control signal. For example, the discharge information includes the current voltage of the charging / discharging load and the model parameters of the charging / discharging load. The charging control signal includes the discharge power. It should be noted that the charging / discharging circuit 10 also provides real-time feedback of relevant charging / discharging parameters such as charging current, discharging current, charging voltage, discharging voltage, charging power, and discharging power based on the charging / discharging information. For example, by setting corresponding voltage detection circuits and current detection circuits in the charging / discharging circuit 10, relevant charging / discharging parameters such as charging current, discharging current, charging voltage, discharging voltage, charging power, and discharging power can be fed back in real time to ensure the safety of the charging / discharging load during the charging / discharging process.

[0048] In one embodiment, the electricity metering circuit 20 includes a first electricity metering circuit 21 and a second electricity metering circuit 22; the input terminal of the first electricity metering circuit 21 is connected to the power grid, and the output terminal of the first electricity metering circuit 21 is connected to the main control circuit 30 to output first electricity consumption information; the input terminal of the second electricity metering circuit 22 is connected to the electrical load 50, and the output terminal of the second electricity metering circuit 22 is connected to the main control circuit 30 to output second electricity consumption information.

[0049] As an example, the input terminal of the first electricity metering circuit 21 is connected to the power grid, and the output terminal of the first electricity metering circuit 21 is connected to the main control circuit 30 to output the first electricity consumption information. Exemplarily, the input terminal of the first electricity metering circuit 21 is located on the connection path between the power grid and all electrical loads 50, ensuring that the first electricity metering circuit 21 can measure the electricity consumption information of all electrical loads 50. Since the electricity price will increase accordingly when the power consumption exceeds a specific threshold, by outputting the first electricity consumption information to the main control circuit 30, the main control circuit 30 can combine it with the second electricity consumption information to cut off power to the electrical loads 50 with higher power consumption or those with lower priority, ensuring that the power consumption does not exceed the specific threshold. Understandably, this specific threshold refers to the power consumption threshold used to determine whether the current power consumption will increase the electricity price.

[0050] As an example, the input terminal of the second power metering circuit 22 is connected to the power load 50, and the output terminal of the second power metering circuit 22 is connected to the main control circuit 30 to output second power consumption information. Understandably, the number of second power metering circuits 22 can be one or more, depending on the actual number of power loads 50. When there are multiple power loads 50, such as at least two, each power load 50 is equipped with a second power metering circuit 22, so that the main control circuit 30 dynamically adjusts the usage of the power loads 50 based on the second power consumption information output by each second power metering circuit 22. For example, when the total power consumption of all power loads 50 is too high, the power load 50 with higher power consumption is shut down, or the power load 50 with lower priority is used.

[0051] Furthermore, both the first power metering circuit 21 and the second power metering circuit 22 include a voltage metering circuit and a current metering circuit. The voltage metering circuit is used to measure the voltage signal, and the current metering circuit is used to measure the current signal. The main control chip 33 can measure the power consumption based on the voltage and current signals.

[0052] For example, the voltage metering circuit includes capacitors C1, C2, C3, C4, C5, and C6, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11, and an operational amplifier U1A. The live wire L_IN_Power of the power grid is connected to one end of capacitor C1. The other end of capacitor C1, along with capacitor C2, resistors R3, R4, R5, and R6, is connected in series to the non-inverting input of operational amplifier U1A. The non-inverting input of operational amplifier U1A is connected to one end of resistor R1, and the other end of resistor R1 is connected to ground DGND. The neutral wire N_IN_Power of the power grid is connected to one end of capacitor C4. The other end of capacitor C4, along with capacitor C5, resistors R7, R8, R9, and R10, is connected in series to the inverting input of operational amplifier U1A. The inverting input of operational amplifier U1A is connected to one end of resistor R11 and capacitor C6. The other ends of resistor R11 and capacitor C6 are connected to the output of operational amplifier U1A. The output of operational amplifier U1A is connected to one end of resistor R2, and the other end of resistor R2 is connected to the voltage detection terminal Vol_MCU of the main control chip 33 to realize the acquisition of voltage signals.

[0053] For example, the current metering circuit includes a current transformer CT1, a surge suppression diode TVS1, a resistor R12, a resistor R13, an operational amplifier U1B, a resistor R14, and a resistor R15.

[0054] Current transformer CT1 is installed on the power supply line of the power grid or the power supply line of the electrical load 50. The first terminal of current transformer CT1 is connected to the first terminals of resistors R12 and R13. The second terminal of current transformer CT1 is grounded. The second terminal of resistor R12 is connected to the non-inverting input terminal of operational amplifier U1B, and the second terminal of resistor R13 is grounded. Surge suppression diode TVS1 is connected in parallel to the first and second terminals of current transformer CT1. The inverting input terminal of operational amplifier U1B is connected to the first terminals of resistors R14 and R15. The second terminal of resistor R14 is connected to the output terminal of operational amplifier U1B, and the second terminal of resistor R15 is grounded. The output terminal of operational amplifier U1B is connected to the current detection terminal IP_MCU of the main control chip 33 to realize the acquisition of current signal.

[0055] In this embodiment, the electricity metering circuit 20 includes a first electricity metering circuit 21 and a second electricity metering circuit 22. The input terminal of the first electricity metering circuit 21 is connected to the power grid, and the output terminal of the first electricity metering circuit 21 is connected to the main control circuit 30 to output first electricity consumption information. The input terminal of the second electricity metering circuit 22 is connected to the electrical load 50, and the output terminal of the second electricity metering circuit 22 is connected to the main control circuit 30 to output second electricity consumption information, so as to facilitate monitoring the electricity consumption information of each electrical load 50.

[0056] In one embodiment, the main control circuit 30 includes a first switching circuit 31, a second switching circuit 32, and a main control chip 33. The first input terminal of the first switching circuit 31 is connected to the power grid, the second input terminal of the first switching circuit 31 is connected to the charging and discharging circuit 10, the output terminal of the first switching circuit 31 is connected to the input terminal of the second switching circuit 32, and the output terminal of the second switching circuit 32 is connected to the electrical load 50. The main control chip 33 is connected to the charging and discharging circuit 10, the electricity metering circuit 20, the first switching circuit 31, and the second switching circuit 32, and is used to control the power grid or the charging and discharging circuit 10 to supply power to the electrical load 50, and / or control the charging and discharging circuit 10 to supply power to the charging and discharging load 40, according to the first electricity consumption information, the second electricity consumption information, and the charging and discharging information.

[0057] In this embodiment, the main control chip 33 controls the operation of the first switching circuit 31 and the second switching circuit 32 based on the first power consumption information, the second power consumption information, and the charging and discharging information, thereby switching the power supply circuit and controlling either the power grid or the charging and discharging circuit 10 to supply power to the electrical load 50, and / or controlling the charging and discharging circuit 10 to supply power to the charging and discharging load 40, so as to dynamically adjust the use of the electrical load 50 and the charging and discharging process of the charging and discharging load 40, realize the reasonable and balanced distribution of power supply energy to the electrical load 50 and the charging and discharging load 40, and improve energy utilization.

[0058] In one embodiment, the main control chip 33 is further configured to control the operation of the charging and discharging circuit 10 and the first switching circuit 31 based on the first power consumption information and the discharge information; and to control the operation of the charging and discharging circuit 10 and the second switching circuit 32 based on the discharge information and the second power consumption information.

[0059] As an example, the main control chip 33 determines whether the power grid and the charging / discharging load 40 can supply power normally based on the first power consumption information and discharge information. For example, if it determines that the power grid is abnormal or that the current power consumption is at its peak, it controls the first switching circuit 31 to conduct the charging / discharging circuit 10 and the second switching circuit 32, and controls the charging / discharging load 40 to discharge through the charging / discharging circuit 10 to supply power to the power load 50. When it determines that the power grid is normal or that the current power consumption is at its low peak based on the first power consumption information and discharge information, it controls the first switching circuit 31 to conduct the power grid and the second switching circuit 32 to supply power to the power load 50 through the power grid, and controls the charging / discharging circuit 10 to charge the charging / discharging load 40 using the power grid. Furthermore, in order to ensure the normal power consumption of the power load 50, the charging / discharging circuit 10 can be controlled to adjust the charging power of the charging / discharging load 40 according to the second power consumption information corresponding to the power load 50, so as not to affect the power consumption of the power load 50, thereby achieving a reasonable and balanced distribution of power supply energy to the power load 50 and the charging / discharging load 40. Furthermore, the second power consumption information also includes voltage, current, and temperature information, used to determine whether the power load 50 has abnormalities such as overcurrent, short circuit, overvoltage, undervoltage, and overtemperature. The main control chip 33 determines whether the power load 50 is working normally based on this second power consumption information. If the power load 50 is determined to be malfunctioning based on the second power consumption information, the main control chip 33 controls the corresponding second switching circuit 32 to disconnect, ensuring safety during power consumption. Furthermore, the charging and discharging information may also include voltage, current, and temperature information, used to determine whether the charging and discharging load 40 has abnormalities such as overcurrent, short circuit, overvoltage, undervoltage, and overtemperature during the charging or discharging process. The main control chip 33 determines whether the charging and discharging circuit 10 is malfunctioning during the charging or discharging process based on the charging and discharging information sent by the charging and discharging circuit 10. If an abnormality is determined in the charging or discharging process, the main control chip 33 controls the charging and discharging circuit 10 to stop charging or discharging, ensuring the safety of the charging and discharging load 40.

[0060] In one embodiment, the main control circuit 30 includes at least two second switch circuits 32, the first end of each second switch circuit 32 is connected to the output end of the first switch circuit 31, and the second end of each second switch circuit 32 is connected to an electrical load 50; the main control chip 33 is used to control the operation of the charging and discharging circuit 10 and the second switch circuit 32 according to the discharge information, the second power consumption information and the preset load priority.

[0061] In this embodiment, when there are at least two electrical loads 50, there are also at least two second switching circuits 32. Each electrical load 50 is connected in series with a second switching circuit 32 to the output terminal of the first switching circuit 31. The main control chip 33 determines whether the charging / discharging load 40 is capable of supplying power to each electrical load 50 based on the discharge information corresponding to the charging / discharging load 40 and the second power consumption information corresponding to each electrical load 50. When it is determined that the charging / discharging load 40 is not capable of supplying power to each electrical load 50, the charging / discharging circuit 10 and the second switching circuit 32 are controlled to work according to the preset load priority. The second switching circuit 32 corresponding to the electrical load 50 with higher priority is turned on, and the second switching circuit 32 corresponding to the electrical load 50 with lower priority is turned off, thereby ensuring that the charging / discharging load 40 can be supplied with power safely and reliably. The preset load priority can be set according to actual experience and is not limited here. Preferably, the discharge information includes the discharge power of the charging / discharging load 40, and the second power consumption information includes the power consumption of the power-consuming load 50. The charging / discharging load 40 is determined to be capable of supplying power to each power-consuming load 50 based on the discharge power of the charging / discharging load 40 and the power consumption of the power-consuming load 50. For example, if the discharge power is greater than the sum of the power consumption of all power-consuming loads 50, it is determined that the charging / discharging load 40 is capable of supplying power to each power-consuming load 50; conversely, if the discharge power is not greater than the sum of the power consumption of all power-consuming loads 50, it is determined that the charging / discharging load 40 is not capable of supplying power to each power-consuming load 50.

[0062] In one embodiment, the main control chip 33 is further configured to determine whether the grid power supply conditions are met based on the first power consumption information and the discharge information; if the grid power supply conditions are met, control the first switching circuit 31 to turn on the power grid and the second switching circuit 32, and control the charging and discharging circuit 10 to charge the charging and discharging load 40 based on the second power consumption information; if the grid power supply conditions are not met, control the first switching circuit 31 to turn on the charging and discharging circuit 10 and the second switching circuit 32, and control the second switching circuit 32 to turn on or off the power load 50 based on the discharge information and the second power consumption information; when the second switching circuit 32 is turned on, control the charging and discharging circuit 10 to discharge the power load 50.

[0063] As an example, the main control chip 33 is also used to determine whether the grid power supply conditions are met based on the first power consumption information and discharge information. For example, the first power consumption information includes the grid voltage and the power supply time period, etc.; the discharge information includes the voltage and discharge power of the charging and discharging load 40, etc. The main control chip 33 determines whether the current grid is stable based on the grid voltage. If the current grid is stable, it determines whether the power supply time period is the peak power supply period. If the power supply time period is not the peak power supply period, it determines that the grid power supply conditions are met. Alternatively, if the current grid is stable and the power supply time period is the peak power supply period, and the voltage and discharge power of the charging and discharging load 40 are low, it determines that the grid power supply conditions are met, controls the first switching circuit 31 to conduct the grid power supply and the second switching circuit 32, and controls the charging and discharging circuit 10 to charge the charging and discharging load 40 based on the second power consumption information. According to the second power consumption information, the charging and discharging circuit 10 is controlled to charge the charging and discharging load 40. For example, when the power consumption in the second power consumption information is large, the charging and discharging circuit 10 is controlled to reduce the charging power of the charging and discharging load 40, thereby ensuring that the power load 50 can use power normally, realizing a reasonable and balanced distribution of power supply energy to the power load 50 and the charging and discharging load 40, and improving energy utilization.

[0064] As an example, if the power supply conditions are not met, such as an unstable power grid, or a stable power grid during peak supply periods, and the voltage and discharge power of the charging / discharging load 40 can supply power normally, then the first switching circuit 31 is controlled to turn on the charging / discharging circuit 10 and the second switching circuit 32. Based on the discharge information and the second power consumption information, the second switching circuit 32 is controlled to turn on or off the power load 50. When the second switching circuit 32 is on, the charging / discharging circuit 10 discharges to the power load 50. For example, based on the discharge power and the power consumption corresponding to each power load 50, it is determined whether the discharge capacity of the charging / discharging circuit 10 meets the power consumption requirements of the power load 50. If the discharge capacity of the charging / discharging circuit 10 does not meet the power consumption requirements of the power load 50, then according to the preset load priority, the second switching circuit 32 corresponding to the higher-priority power load 50 is turned on, and the second switching circuit 32 corresponding to the lower-priority power load 50 is turned off, thereby ensuring that the charging / discharging load 40 can be supplied with power safely and reliably.

[0065] In one embodiment, the first switching circuit 31 includes a dual power converter; the first input terminal of the dual power converter is connected to the power grid, the second input terminal of the dual power converter is connected to the charging and discharging circuit 10, and the output terminal of the dual power converter is connected to the input terminal of the second switching circuit 32.

[0066] In this embodiment, the first input terminal of the dual power converter is used to connect to the power grid, the second input terminal of the dual power converter is connected to the charging and discharging circuit 10, and the output terminal of the dual power converter is connected to the input terminal of the second switching circuit 32, so that only the power grid or the charging and discharging circuit 10 supplies power at the same time. The switching speed is fast, generally less than 100 milliseconds, ensuring that the power load 50 will not lose power during the switching process between the power grid and the charging and discharging circuit 10.

[0067] In one embodiment, as shown in FIG4, the second switching circuit 32 includes a first transistor Q1 and a first relay K1; the first relay K1 includes a normally closed moving contact, a normally closed stationary contact, and a coil; the normally closed moving contact is used to connect to the power grid, and the normally closed stationary contact is used to connect to the electrical load 50; the first end of the coil is used to connect to the first power supply terminal VCC+5V, the second end of the coil is connected to the first end of the first transistor Q1, the second end of the first transistor Q1 is grounded, and the third end of the first transistor Q1 is coupled to the first control terminal Relay_Col_02 of the main control chip 33. L_OUT_Power and N_OUT_Power are used to connect to the electrical load 50.

[0068] As an example, the first transistor Q1 can be a bipolar transistor or a field-effect transistor. The first terminal of the first transistor Q1 is the collector or source, the second terminal of the first transistor Q1 is the emitter or drain, and the third terminal of the first transistor Q1 is the base or gate.

[0069] In this embodiment, when the main control chip 33 needs to control the second switching circuit 32 to disconnect, it outputs a switch control signal to the third terminal of the first transistor Q1. The first transistor Q1 is turned on, and the coil of the first relay K1 is energized, thereby controlling the normally closed moving contact and the normally closed stationary contact to open, thus disconnecting the second switching circuit 32. When the main control chip 33 needs to control the second switching circuit 32 to turn on, it stops outputting the switch control signal to the third terminal of the first transistor Q1. The first transistor Q1 is turned off, the coil is de-energized, and the normally closed moving contact and the normally closed stationary contact are reset and turned on, thereby turning on the second switching circuit 32.

[0070] The second switching circuit 32 also includes resistors R16 and R17 and a protection diode D1.

[0071] For example, resistors R16 and R17 are connected in series between the main control chip 33 and ground, and the connection node of resistors R16 and R17 is connected to the third terminal of the first transistor Q1. The anode of the protection diode D1 is connected to the first terminal of the first transistor Q1, and the cathode of the protection diode D1 is connected to the first power supply terminal VCC+5V.

[0072] In this embodiment, a second switching circuit 32 is formed by the first relay K1 and the first transistor Q1, ensuring that the second switching circuit 32 has a fast response speed and high safety during the conduction and disconnection process.

[0073] This embodiment provides an AC charging and discharging device, including the load power supply control circuit as described above.

[0074] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A load supply control circuit, wherein, Includes charging and discharging circuits, power metering circuits, and main control circuits; The charging and discharging circuit is used to connect the power grid and the charging and discharging load, to perform charging and discharging processing on the charging and discharging load, and to output charging and discharging information. The electricity metering circuit is used to connect the power grid and the electrical load, and is used to measure the first electricity consumption information of the power grid and the second electricity consumption information of the electrical load. The main control circuit is used to connect the power grid and the electrical load, and is connected to the charging and discharging circuit and the electricity metering circuit. It is used to control the power grid or the charging and discharging circuit to supply power to the electrical load, and / or control the charging and discharging circuit to supply power to the charging and discharging load, based on the first electricity consumption information, the second electricity consumption information and the charging and discharging information.

2. The load fed control circuit of claim 1, wherein, The charging and discharging circuit is used for, The interface signal corresponding to the charging / discharging load is detected, and charging / discharging information is output to the main control circuit according to the interface signal; in response to the charging / discharging control signal output by the main control circuit, the charging / discharging load is charged / discharged.

3. The load fed control circuit of claim 1, wherein, The electricity metering circuit includes a first electricity metering circuit and a second electricity metering circuit; The input terminal of the first electricity metering circuit is used to connect to the power grid, and the output terminal of the first electricity metering circuit is connected to the main control circuit to output the first electricity consumption information. The input terminal of the second electricity metering circuit is used to connect to the electrical load, and the output terminal of the second electricity metering circuit is connected to the main control circuit to output the second electricity consumption information.

4. The load fed control circuit of claim 1, wherein, The main control circuit includes a first switching circuit, a second switching circuit, and a main control chip; The first input terminal of the first switching circuit is used to connect to the power grid, the second input terminal of the first switching circuit is connected to the charging and discharging circuit, the output terminal of the first switching circuit is connected to the input terminal of the second switching circuit, and the output terminal of the second switching circuit is used to connect to the electrical load. The main control chip is connected to the charging and discharging circuit, the electricity metering circuit, the first switching circuit, and the second switching circuit. It is used to control the power grid or the charging and discharging circuit to supply power to the electrical load based on the first electricity consumption information, the second electricity consumption information, and the charging and discharging information, and / or control the charging and discharging circuit to supply power to the charging and discharging load.

5. The load power supply control circuit as described in claim 4, wherein, The main control chip is also used for, Based on the first power consumption information and the discharge information, control the operation of the charging and discharging circuit and the first switching circuit; Based on the discharge information and the second power consumption information, the charging and discharging circuit and the second switching circuit are controlled to operate.

6. The load power supply control circuit as described in claim 5, wherein, The main control circuit includes at least two second switching circuits, the first end of each second switching circuit is connected to the output end of the first switching circuit, and the second end of each second switching circuit is connected to an electrical load. The main control chip is used to control the operation of the charging and discharging circuit and the second switching circuit according to the discharge information, the second power consumption information and the preset load priority.

7. The load power supply control circuit as described in claim 5, wherein, The main control chip is also used for, Based on the first power consumption information and the discharge information, determine whether the power grid supply conditions are met; If the power grid supply conditions are met, the first switching circuit is controlled to connect the power grid and the second switching circuit, and the charging and discharging circuit is controlled to charge the charging and discharging load according to the second power consumption information. If the power supply conditions of the power grid are not met, the first switching circuit is controlled to turn on the charging and discharging circuit and the second switching circuit, and the second switching circuit is controlled to turn on or off the electrical load according to the discharge information and the second power consumption information. When the second switching circuit is turned on, the charging and discharging circuit is controlled to discharge the electrical load.

8. The load power supply control circuit as described in claim 4, wherein, The first switching circuit includes a dual-power converter; The first input terminal of the dual power converter is used to connect to the power grid, the second input terminal of the dual power converter is connected to the charging and discharging circuit, and the output terminal of the dual power converter is connected to the input terminal of the second switching circuit.

9. The load power supply control circuit as described in claim 4, wherein, The second switching circuit includes a first transistor and a first relay; the first relay includes a normally closed moving contact, a normally closed stationary contact, and a coil; The normally closed moving contact is used to connect to the power grid, and the normally closed stationary contact is used to connect to the electrical load; the first end of the coil is used to connect to the first power supply end, the second end of the coil is connected to the first end of the first transistor, the second end of the first transistor is grounded, and the third end of the first transistor is coupled to the main control chip.

10. An AC charging and discharging device, wherein, Includes the load power supply control circuit as described in any one of claims 1 to 9.

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