Direct current charging control circuit and charging equipment

Abstract

The utility model is suitable for the technical field of direct current charging, and provides a direct current charging control circuit and charging equipment. The DC charging control circuit comprises a switch unit, a signal processing unit, a load voltage detection unit, a power supply anode output contact, a power supply cathode output contact, a load anode input contact and a load cathode input contact. The switch unit is electrically connected with the signal processing unit, the power supply anode output contact and the load anode input contact, and the signal processing unit is electrically connected with the load voltage detection unit, the power supply cathode output contact and the load cathode input contact. The load voltage detection unit is electrically connected with the power supply anode output contact, the power supply cathode output contact, the load anode input contact and the load cathode input contact. According to the direct current charging control circuit provided by the embodiment of the invention, the possibility of ignition can be greatly reduced at the moment when the load is connected to the load anode input contact and the load cathode input contact, and the power supply stability and safety are improved.

Description

Technical Field

[0001] This application belongs to the field of DC charging technology, and in particular relates to a DC charging control circuit and charging equipment. Background Technology

[0002] During DC charging, the metal connection terminals between the DC charging base and the load are prone to wear due to poor contact and arcing over long-term use, which can affect the normal power-carrying function of the charging base. This problem not only reduces the lifespan of the charging base but may also pose a safety risk. Existing technologies typically use pre-charge resistors and delay circuits to mitigate arcing of the charging contacts. However, when the charging load experiences a short circuit or has a large internal capacitance, the pre-charge resistor is easily burned out, resulting in a still relatively high possibility of arcing when the DC charging base is connected to the load. Utility Model Content

[0003] This application provides a DC charging control circuit and charging device, which can solve the problem that the existing DC charging dock still has a high possibility of arcing when a load is connected.

[0004] In a first aspect, embodiments of this application provide a DC charging control circuit, including a switching unit, a signal processing unit, a load voltage detection unit, a power supply positive output contact, a power supply negative output contact, a load positive input contact, and a load negative input contact.

[0005] The switching unit is electrically connected to the signal processing unit, the positive power supply output contact, and the positive load input contact, respectively. The signal processing unit is electrically connected to the load voltage detection unit, the negative power supply output contact, and the negative load input contact, respectively. The load voltage detection unit is electrically connected to the positive power supply output contact, the negative power supply output contact, the positive load input contact, and the negative load input contact, respectively. The positive power supply output contact is used to connect to the positive terminal of the power supply equipment, the negative power supply output contact is used to connect to the negative terminal of the power supply equipment, the positive load input contact is used to connect to the positive terminal of the load, and the negative load input contact is used to connect to the negative terminal of the load.

[0006] In one possible implementation of the first aspect, the switching unit includes a first switching transistor, the control terminal of the first switching transistor being electrically connected to the signal processing unit, the first conducting terminal of the first switching transistor being electrically connected to the positive output contact of the power supply, and the second conducting terminal of the first switching transistor being electrically connected to the positive input contact of the load.

[0007] In one possible implementation of the first aspect, the first switch is a PMOS transistor or an NMOS transistor.

[0008] In one possible implementation of the first aspect, the switching unit is further electrically connected to the negative input contact of the load. The switching unit includes a relay, a first end of the control coil of the relay is electrically connected to the signal processing unit, a second end of the control coil of the relay is electrically connected to the negative input contact of the load, a first conducting end of the relay is electrically connected to the positive output contact of the power supply, and a second conducting end of the relay is electrically connected to the positive input contact of the load.

[0009] In one possible implementation of the first aspect, the signal processing unit includes a signal processor, which is electrically connected to the switching unit, the load voltage detection unit, the power supply negative output contact, and the load negative input contact, respectively.

[0010] In one possible implementation of the first aspect, the signal processing unit includes a voltage comparator, a first input terminal of which is electrically connected to the load voltage detection unit, a second input terminal of which is used to receive a reference voltage signal, and an output terminal of which is electrically connected to the switching unit.

[0011] In one possible implementation of the first aspect, the load voltage detection unit includes a first resistor and a second resistor. A first end of the first resistor is electrically connected to the positive output contact of the power supply. A second end of the first resistor is electrically connected to the first end of the second resistor, the signal processing unit, and the positive input contact of the load, respectively. A second end of the second resistor is electrically connected to the negative output contact of the power supply and the negative input contact of the load, respectively.

[0012] In one possible implementation of the first aspect, the DC charging control circuit further includes a current detection unit, which is electrically connected to the switching unit, the signal processing unit, and the positive input contact of the load, respectively. The current detection unit is used to detect the charging current transmitted to the load and output a feedback current signal to the signal processing unit.

[0013] In one possible implementation of the first aspect, the current detection unit includes a third resistor, the first end of which is electrically connected to the switching unit and the signal processing unit, and the second end of which is electrically connected to the positive input contact of the load.

[0014] Secondly, embodiments of this application provide a charging device, including the DC charging control circuit described in any one of the first aspects.

[0015] The beneficial effects of the embodiments in this application compared with the prior art are:

[0016] The DC charging control circuit provided in this application includes a switching unit, a signal processing unit, a load voltage detection unit, a positive power supply output contact, a negative power supply output contact, a positive load input contact, and a negative load input contact. When the positive power supply output contact is connected to the positive terminal of the power supply device, and the negative power supply output contact is connected to the negative terminal of the power supply device, at the instant the load is connected (i.e., the positive terminal of the load connects to the positive load input contact and the negative load input contact), the load voltage detection unit can detect the voltage between the positive and negative terminals of the load and output a feedback voltage signal to the signal processing unit. The signal processing unit outputs a control signal to the switching unit based on the feedback voltage signal to control the switching unit to conduct. Therefore, the DC charging control circuit provided in this application can determine whether the connection between the power supply device and the load is stable and reliable by detecting voltage changes at the instant the load is connected to the positive and negative load input contacts. After determining that the connection between the power supply device and the load is stable and reliable, it controls the switching unit to conduct, thereby enabling the power supply device to charge the load. This design greatly reduces the possibility of arcing when the DC charging dock is connected to a load, thus improving power supply stability and safety.

[0017] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0019] Figure 1 This is a schematic block diagram of a DC charging control circuit provided in one embodiment of this application;

[0020] Figure 2 This is a circuit connection diagram of a DC charging control circuit provided in an embodiment of this application;

[0021] Figure 3 This is a circuit connection diagram of a DC charging control circuit provided in another embodiment of this application;

[0022] Figure 4 This is a circuit connection diagram of a DC charging control circuit provided in another embodiment of this application;

[0023] Figure 5 This is a schematic block diagram of a DC charging control circuit provided in another embodiment of this application;

[0024] Figure 6 This is a circuit connection diagram of a DC charging control circuit provided in another embodiment of this application.

[0025] In the diagram, 101 is the switching unit; 102 is the signal processing unit; 103 is the load voltage detection unit; 104 is the positive power supply output contact; 105 is the negative power supply output contact; 106 is the positive load input contact; 107 is the negative load input contact; and 108 is the current detection unit. Detailed Implementation

[0026] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0027] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0028] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0029] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0030] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0032] During DC charging, the metal connection terminals between the DC charging base and the load are prone to wear due to poor contact and arcing over long-term use, which can affect the normal power-carrying function of the charging base. This problem not only reduces the lifespan of the charging base but may also pose a safety risk. Existing technologies typically use pre-charge resistors and delay circuits to mitigate arcing of the charging contacts. However, when the charging load experiences a short circuit or has a large internal capacitance, the pre-charge resistor is easily burned out, resulting in a still relatively high possibility of arcing when the DC charging base is connected to the load.

[0033] To address the aforementioned issues, the DC charging control circuit provided in this application includes a switching unit, a signal processing unit, a load voltage detection unit, a positive power supply output contact, a negative power supply output contact, a positive load input contact, and a negative load input contact. When the positive power supply output contact is connected to the positive terminal of the power supply device, and the negative power supply output contact is connected to the negative terminal of the power supply device, at the instant the load is connected (i.e., the positive terminal of the load connects to the positive load input contact and the negative load input contact), the load voltage detection unit can detect the voltage between the positive and negative terminals of the load and output a feedback voltage signal to the signal processing unit. The signal processing unit outputs a control signal to the switching unit based on the feedback voltage signal to control the switching unit to conduct. Therefore, the DC charging control circuit provided in this application can determine whether the connection between the power supply device and the load is stable and reliable by detecting voltage changes at the instant the load is connected to the positive and negative load input contacts. After determining that the connection between the power supply device and the load is stable and reliable, it controls the switching unit to conduct, thereby enabling the power supply device to charge the load. This design greatly reduces the possibility of arcing when the DC charging dock is connected to a load, thus improving power supply stability and safety.

[0034] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0035] Figure 1A schematic block diagram of a DC charging control circuit according to an embodiment of this application is shown. See also... Figure 1 As shown, the DC charging control circuit includes a switching unit 101, a signal processing unit 102, a load voltage detection unit 103, a power supply positive output contact 104, a power supply negative output contact 105, a load positive input contact 106, and a load negative input contact 107. The switching unit 101 is electrically connected to the signal processing unit 102, the power supply positive output contact 104, and the load positive input contact 106, respectively. The signal processing unit 102 is electrically connected to the load voltage detection unit 103, the power supply negative output contact 105, and the load negative input contact 107, respectively. The load voltage detection unit 103 is electrically connected to the power supply positive output contact 104, the power supply negative output contact 105, the load positive input contact 106, and the load negative input contact 107, respectively. The power supply positive output contact 104 is used to connect to the positive terminal of the power supply equipment, the power supply negative output contact 105 is used to connect to the negative terminal of the power supply equipment, the load positive input contact 106 is used to connect to the positive terminal of the load, and the load negative input contact 107 is used to connect to the negative terminal of the load.

[0036] Specifically, when the positive output contact 104 is connected to the positive terminal of the power supply device and the negative output contact 105 is connected to the negative terminal of the power supply device, at the instant the load is connected—that is, at the instant the positive terminal of the load connects to the positive input contact 106 and the negative terminal of the load connects to the negative input contact 107—the load voltage detection unit 103 can detect the voltage between the positive and negative terminals of the load and output a feedback voltage signal to the signal processing unit 102. The signal processing unit 102 outputs a control signal to the switching unit 101 based on the feedback voltage signal to control the switching unit 101 to conduct. Therefore, the DC charging control circuit provided in this embodiment can determine whether the connection between the power supply device and the load is stable and reliable by detecting voltage changes at the instant the load is connected to the positive input contact 106 and the negative input contact 107. After determining that the connection between the power supply device and the load is stable and reliable, it controls the switching unit 101 to conduct, realizing the charging of the load by the power supply device. This design can greatly reduce the possibility of arcing of the DC charging socket at the instant the load is connected, improving power supply stability and safety.

[0037] For example, the positive power supply output contact 104 and the negative power supply output contact 105 can be integrated into a single socket, allowing the user to complete the connection simply by plugging the power supply device into the socket. Similarly, the positive load input contact 106 and the negative load input contact 107 can be integrated into a single socket, allowing the user to complete the connection simply by plugging the load into the socket. This design simplifies user operation, reduces wiring complexity, and improves the reliability and safety of connections to the power supply device and load. The power supply device can be a power source, generator, etc., and the load can be any electrical appliance, energy storage device, etc.

[0038] It should be noted that the signal processing unit 102 can detect voltage changes based on the received feedback voltage signal and determine whether the voltage change is within a preset range (e.g., higher than the lower limit of the preset value but lower than the upper limit of the preset value). If the detected voltage change is within the preset range, it indicates that the connection between the power supply equipment and the load is stable and reliable. At this time, the signal processing unit 102 controls the switch unit 101 to conduct, realizing the charging of the load by the power supply equipment. If the detected voltage change exceeds the preset range, it indicates that there may be poor contact or other faults in the connection. The signal processing unit 102 will keep the control switch unit 101 disconnected to prevent the occurrence of high current arcing. The preset voltage change range is not limited in this respect, but is set according to the normal operating voltage of the load and the possible voltage fluctuation range to ensure that the voltage change is within a reasonable range under normal connection conditions. In addition, the control signal output by the signal processing unit 102 can also be a PWM signal. By adjusting the duty cycle of the PWM signal, the conduction degree of the switch unit 101 can be controlled to adjust the charging current of the power supply equipment to the load. The PWM signal can achieve precise control of the charging current, ensuring that the load is charged within a safe range. Furthermore, the PWM signal can dynamically adjust the charging current to improve the system's adaptability and stability when the load changes or system parameters fluctuate. Simultaneously, by gradually increasing the charging current, arcing during high-current instantaneous connection can be effectively reduced, further enhancing the safety and reliability of the charging system.

[0039] In one embodiment of this application, the DC charging control circuit further includes a temperature sensor, and the signal processing unit 102 can be connected to the temperature sensor. The temperature sensor is used to monitor the temperature of each unit in the DC charging control circuit in real time and transmits the collected temperature value of each unit to the signal processing unit 102. Specifically, when the signal processing unit 102 detects that any temperature value exceeds a preset temperature, the signal processing unit 102 can control the switching unit 101 to open to prevent overheating and damage to the device. In addition, the DC charging control circuit also includes an alarm unit, and the signal processing unit 102 can also be connected to the alarm unit. The alarm unit is used to output an alarm signal according to the alarm control signal output by the signal processing unit 102. Specifically, when the signal processing unit 102 detects a circuit fault or abnormal current and voltage parameters, the signal processing unit 102 can output an alarm control signal to the alarm unit so that the alarm unit can notify the user or monitoring center through an indicator light, a buzzer, or a communication interface.

[0040] In one embodiment of this application, such as Figure 2 As shown, the switching unit 101 includes a first switching transistor Q1. The control terminal of the first switching transistor Q1 is electrically connected to the signal processing unit 102. The first conducting terminal of the first switching transistor Q1 is electrically connected to the positive output contact 104 of the power supply. The second conducting terminal of the first switching transistor Q1 is electrically connected to the positive input contact 106 of the load.

[0041] Specifically, the first switching transistor Q1, as an electronic switching device, can be turned on or off according to the control signal output by the signal processing unit 102, thereby connecting or disconnecting the power supply equipment and the load. When the first switching transistor Q1 is turned on, the power supply equipment can charge the load; when the first switching transistor Q1 is turned off, the power supply equipment cannot charge the load.

[0042] For example, designers can select the type of the first switching transistor Q1 according to the actual situation, and can use fully controllable power devices such as metal-oxide-semiconductor field-effect transistors or insulated-gate bipolar transistors. For example, Figure 2 The first switch Q1 shown is an NMOS transistor. In this case, the gate of the NMOS transistor serves as the control terminal of Q1, receiving the control signal. The drain of the NMOS transistor serves as the first conducting terminal of Q1, and the source of the NMOS transistor serves as the second conducting terminal. When the control signal received at the gate of the NMOS transistor is a high-level signal, it indicates that the power supply and load are stably and reliably connected. The NMOS transistor turns on according to the high-level signal, meaning that the drain and source of the NMOS transistor are connected, thereby enabling the power supply to charge the load. For example, Figure 3The first switch Q1 shown is a PMOS transistor. In this configuration, the gate of the PMOS transistor serves as the control terminal of Q1, receiving the control signal. The source of the PMOS transistor serves as the first conducting terminal of Q1, and the drain of the PMOS transistor serves as the second conducting terminal. When the control signal received by the gate of the PMOS transistor is a low-level signal, it indicates that the power supply and load are stably and reliably connected. The PMOS transistor turns on according to the low-level signal, meaning that the source and drain of the PMOS transistor are connected, thereby enabling the power supply to charge the load.

[0043] In one embodiment of this application, such as Figure 4 As shown, the switching unit 101 is also electrically connected to the load negative input contact 107. The switching unit 101 includes a relay K1. The first end of the control coil of the relay K1 is electrically connected to the signal processing unit 102. The second end of the control coil of the relay K1 is electrically connected to the load negative input contact 107. The first conducting end of the relay K1 is electrically connected to the power supply positive output contact 104. The second conducting end of the relay K1 is electrically connected to the load positive input contact 106.

[0044] Specifically, relay K1, as an electromagnetic switch used to control the on / off state of the circuit, can connect or disconnect between its first and second conducting terminals after its control coil is energized. If relay K1 is a normally open relay, the corresponding control signal is the current signal flowing through the control coil. When current flows through the control coil of relay K1, the first and second conducting terminals of relay K1 are connected, thereby enabling the power supply equipment to charge the load. If relay K1 is a normally closed relay, the corresponding control signal is the current signal flowing through the control coil. When no current flows through the control coil of relay K1, the first and second conducting terminals of relay K1 are connected, thereby enabling the power supply equipment to charge the load.

[0045] In one embodiment of this application, such as Figure 2 , Figure 3 and Figure 4 As shown, the signal processing unit 102 includes a signal processor, which is electrically connected to the switching unit 101, the load voltage detection unit 103, the power supply negative output contact 105, and the load negative input contact 107.

[0046] Specifically, the signal processor can receive the feedback voltage signal from the load voltage detection unit 103, detect voltage changes based on the feedback voltage signal, and determine whether the voltage change is within a preset range. When the detected voltage change is within the preset range, the signal processor outputs a control signal to the switching unit 101 to turn on the switching unit 101, enabling the power supply equipment to charge the load. Conversely, it controls the switching unit 101 to turn off, preventing the power supply equipment from charging the load.

[0047] It should be noted that the signal processor can be equipped with various communication interfaces, such as SPI (Serial Peripheral Interface), I2C (Inter-Integrated Circuit), and CAN (Controller Area Network). Through these communication interfaces, the signal processor can send parameter information and status data of the DC charging control circuit to a remote monitoring center, enabling remote monitoring and control. The signal processor can identify different load types by detecting load characteristics (such as impedance and current). Based on the load characteristics, the signal processor can adjust the power supply parameters to ensure the load operates under optimal conditions.

[0048] In one embodiment of this application, the signal processing unit 102 may further include a voltage comparator, the first input terminal of which is electrically connected to the load voltage detection unit 103, the second input terminal of which is used to receive a reference voltage signal, and the output terminal of which is electrically connected to the switching unit 101.

[0049] Specifically, the voltage comparator compares the received feedback voltage signal with the reference voltage signal and outputs a control signal to the switching unit 101 based on the comparison result. The reference voltage signal can be a preset voltage value or a preset voltage range. When the feedback voltage signal is greater than or equal to the reference voltage signal, it indicates that the connection between the power supply equipment and the load is stable and reliable. In this case, the voltage comparator outputs a control signal to control the switching unit 101 to conduct, enabling the power supply equipment to charge the load. When the feedback voltage signal is less than the reference voltage signal, it indicates that there may be poor contact or other faults in the connection. The voltage comparator outputs a control signal to control the switching unit 101 to disconnect, preventing high-current arcing.

[0050] It should be noted that the embodiments provided in this application only show one element as a signal processing unit 102, and do not mean that only this one element can realize the function of the signal processing unit 102. Other elements that can realize this function can also be substituted, and are not limited to this.

[0051] In one embodiment of this application, such as Figure 2 , Figure 3 and Figure 4 As shown, the load voltage detection unit 103 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected to the positive power supply output contact 104. The second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, the signal processing unit 102, and the positive load input contact 106, respectively. The second end of the second resistor R2 is electrically connected to the negative power supply output contact 105 and the negative load input contact 107, respectively.

[0052] Specifically, both the first resistor R1 and the second resistor R2 are used to divide the initial voltage output by the power supply equipment and transmit the divided voltage to the signal processing unit 102. When the load is connected to both the positive input terminal 106 and the negative input terminal 107, the load is connected in parallel with the second resistor R2, causing a change in the feedback voltage signal transmitted to the signal processing unit 102. At this time, the signal processing unit 102 can detect the voltage change by detecting the feedback voltage signal, thus knowing that the load has been connected to the circuit.

[0053] It should be noted that the resistance values ​​and number of the first resistor R1 and the second resistor R2 are not limited here. For example, the resistance values ​​of the first resistor R1 and the second resistor R2 can both be fixed or variable, and the number of the first resistor R1 and the second resistor R2 can both be one or more. Figure 2 , Figure 3 and Figure 4 The circuit structure of the load voltage detection unit 103, which includes a first resistor R1 with a fixed resistance value and a second resistor R2 with a fixed resistance value, is shown only. Different numbers or types of resistors can be used to replace the first resistor R1 and the second resistor R2. Their basic working principle is similar, so they will not be described in detail here.

[0054] In one embodiment of this application, such as Figure 5 As shown, the DC charging control circuit also includes a current detection unit 108, which is electrically connected to the switching unit 101, the signal processing unit 102, and the load positive input contact 106.

[0055] Specifically, the current detection unit 108 is used to detect the power supply current of the power supply equipment charging the load, that is, the charging current transmitted to the load, and outputs a feedback current signal to the signal processing unit 102. The signal processing unit 102 can determine whether the connection between the power supply equipment and the load is stable and reliable based on the feedback current signal. When the detected charging current is greater than the first preset current or less than the second preset current, it indicates that there may be a connection abnormality such as poor contact between the power supply equipment and the load. The signal processing unit 102 controls the switch unit 101 to disconnect, thereby improving the reliability of power supply.

[0056] It should be noted that the first preset current is greater than the second preset current. The specific current values ​​of the first and second preset currents are not limited and can be set according to the working characteristics and safety requirements of the load to ensure the stable and safe operation of the system.

[0057] In one embodiment of this application, such as Figure 6 As shown, the current detection unit 108 includes a third resistor R3. The first end of the third resistor R3 is electrically connected to the switching unit 101 and the signal processing unit 102, respectively, and the second end of the third resistor R3 is electrically connected to the positive input contact 106 of the load.

[0058] Specifically, the third resistor R3 is used to convert voltage to current. The current flowing through the third resistor R3, i.e. the charging current, can be determined by the supply voltage and the resistance value of the third resistor R3, and a feedback current signal is generated at the first end of the third resistor R3.

[0059] It should be noted that the resistance value and number of the third resistor R3 are not limited here. For example, the resistance value of the third resistor R3 can be a fixed value or a variable value, and the number of third resistors R3 can be one or more. Figure 6 Only the circuit structure of the current detection unit 108 including a third resistor R3 with a fixed resistance value is shown. The third resistor R3 can be replaced with different numbers or different types of resistors. The basic working principle is similar, so it will not be described in detail here.

[0060] This application also discloses a charging device, including the aforementioned DC charging control circuit. By using the aforementioned DC charging control circuit, the charging device can greatly reduce the possibility of arcing when the DC charging socket is connected to a load, thereby improving the power supply stability and safety of the charging device.

[0061] Since the processing and functions implemented by the charging device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned DC charging control circuit, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0062] 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 DC charging control circuit, characterized in that, It includes a switching unit, a signal processing unit, a load voltage detection unit, a positive power supply output contact, a negative power supply output contact, a positive load input contact, and a negative load input contact; The switching unit is electrically connected to the signal processing unit, the positive power supply output contact, and the positive load input contact, respectively. The signal processing unit is electrically connected to the load voltage detection unit, the negative power supply output contact, and the negative load input contact, respectively. The load voltage detection unit is electrically connected to the positive power supply output contact, the negative power supply output contact, the positive load input contact, and the negative load input contact, respectively. The positive power supply output contact is used to connect to the positive terminal of the power supply equipment, the negative power supply output contact is used to connect to the negative terminal of the power supply equipment, the positive load input contact is used to connect to the positive terminal of the load, and the negative load input contact is used to connect to the negative terminal of the load.

2. The DC charging control circuit according to claim 1, characterized in that, The switching unit includes a first switching transistor, the control terminal of the first switching transistor is electrically connected to the signal processing unit, the first conducting terminal of the first switching transistor is electrically connected to the positive output contact of the power supply, and the second conducting terminal of the first switching transistor is electrically connected to the positive input contact of the load.

3. The DC charging control circuit according to claim 2, characterized in that, The first switching transistor is a PMOS transistor or an NMOS transistor.

4. The DC charging control circuit according to claim 1, characterized in that, The switching unit is also electrically connected to the negative input contact of the load. The switching unit includes a relay. The first end of the control coil of the relay is electrically connected to the signal processing unit. The second end of the control coil of the relay is electrically connected to the negative input contact of the load. The first conducting end of the relay is electrically connected to the positive output contact of the power supply. The second conducting end of the relay is electrically connected to the positive input contact of the load.

5. The DC charging control circuit according to claim 1, characterized in that, The signal processing unit includes a signal processor, which is electrically connected to the switching unit, the load voltage detection unit, the power supply negative output contact, and the load negative input contact.

6. The DC charging control circuit according to claim 1, characterized in that, The signal processing unit includes a voltage comparator. The first input terminal of the voltage comparator is electrically connected to the load voltage detection unit, the second input terminal of the voltage comparator is used to receive a reference voltage signal, and the output terminal of the voltage comparator is electrically connected to the switching unit.

7. The DC charging control circuit according to claim 1, characterized in that, The load voltage detection unit includes a first resistor and a second resistor. The first end of the first resistor is electrically connected to the positive output contact of the power supply. The second end of the first resistor is electrically connected to the first end of the second resistor, the signal processing unit, and the positive input contact of the load. The second end of the second resistor is electrically connected to the negative output contact of the power supply and the negative input contact of the load.

8. The DC charging control circuit according to any one of claims 1-7, characterized in that, The DC charging control circuit further includes a current detection unit, which is electrically connected to the switching unit, the signal processing unit, and the positive input contact of the load. The current detection unit is used to detect the charging current transmitted to the load and output a feedback current signal to the signal processing unit.

9. The DC charging control circuit according to claim 8, characterized in that, The current detection unit includes a third resistor. The first end of the third resistor is electrically connected to the switching unit and the signal processing unit, respectively, and the second end of the third resistor is electrically connected to the positive input contact of the load.

10. A charging device, characterized in that, Includes the DC charging control circuit according to any one of claims 1-9.

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