A channel sampling switching device

Abstract

This utility model relates to the field of battery charging and discharging technology, specifically a channel sampling switching device. It includes at least two charging and discharging channels, each containing a positive and a negative wire. One end of the positive wire has a positive input port, and the other end has a positive output port; one end of the negative wire has a negative input port, and the other end has a negative output port. Connecting lines exist between the positive wires of different charging and discharging channels and between the negative wires of different charging and discharging channels. Switches are present on the positive wires, negative wires, and connecting lines. The key feature is that both the positive and negative input ports are connected to the control module of the charging and discharging equipment via a sampling switching circuit. This sampling switching circuit enables the control module to collect the voltage between the positive input port or negative output port and the positive and negative output ports. This switching device features a high degree of automation and high sampling accuracy.

Description

Technical Field

[0001] This utility model relates to the field of battery charging and discharging technology, specifically a channel sampling switching device. Background Technology

[0002] Battery charging and discharging equipment typically contains multiple charging and discharging channels. During operation, these channels require voltage monitoring. Traditionally, the voltage sampling port of the control module is connected to test leads, with clamps at the outer ends. To monitor the voltage of a specific channel, the clamps are manually attached to the corresponding channel end. This manual operation has low automation; furthermore, inconsistent clamping positions and varying distances from the connection point to the clamps lead to different conductor lengths and resistances, resulting in sampling errors and low accuracy. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a channel sampling switching device with a high degree of automation and high sampling accuracy.

[0004] To solve the above problems, the following technical solutions are provided: This utility model's channel sampling switching device includes at least two charging / discharging channels, each containing a positive and a negative wire. One end of the positive wire has a positive input port, and the other end has a positive output port; one end of the negative wire has a negative input port, and the other end has a negative output port. Connecting lines exist between the positive wires of different charging / discharging channels and between the negative wires of different charging / discharging channels. Switches are present on the positive wires, negative wires, and connecting lines. The key feature is that both the positive and negative input ports are connected to the control module of the charging / discharging device via a sampling switching circuit. This sampling switching circuit enables the control module to collect the voltage between the positive input port or negative output port and the positive and negative output ports.

[0005] The circuit comprises two charging / discharging channels, namely charging / discharging channel one and charging / discharging channel two. The sampling switching circuit includes a first control unit, a second control unit, and a switching unit. The first control unit is located between charging / discharging channel one and the control module, and is used to enable the control module to collect the voltage between the positive input port CH1-IN+ and the positive output port CH1-OUT+, and the voltage between the negative input port CH1-IN- and the negative output port CH1-OUT- of charging / discharging channel one. The second control unit is located between charging / discharging channel two and the control module, and is used to enable the control module to collect the voltage between charging / discharging channel one and the positive input port CH1-IN+ and the negative output port CH1-OUT-. The voltage between the positive input port CH2-IN+ and the positive output port CH2-OUT+ of discharge channel two, and the voltage between the negative input port CH2-IN- and the negative output port CH2-OUT-; the switching unit is adapted to be connected between the first control unit and the second control unit, and is used to enable the control module to collect the voltage between the positive input port CH1-IN+ of charge / discharge channel one and the positive output port CH2-OUT+ of charge / discharge channel two, and to collect the voltage between the negative input port CH1-IN- of charge / discharge channel one and the negative output port CH2-OUT- of charge / discharge channel two.

[0006] The first control unit includes a two-on, two-off relay JD01, a single-on, single-off relay U1, and a single-on, single-off relay U2. The positive terminal of the coil of the two-off relay JD01 is connected to one end of resistor R7 and the negative terminal of diode D12, respectively. The other end of resistor R7 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD01 is adapted and connected to the control module to control the energization or de-energization of the coil of the two-off relay JD01. The anode of diode D12 is connected to the negative terminal of the coil of the two-off relay JD01. One end of the coil of the single-on, single-off relay U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to a 12V power supply and the cathode of diode D12. The other end of the coil of the single-on, single-off relay U1 is connected to the anode of diode D5 and the negative terminal of the two-off relay U2. The first common terminal of the closed relay JD01 is connected; one end of the switch terminal of the single-open single-closed relay U1 is connected to the positive input port CH1-IN+, and the other end of the switch terminal of the single-open single-closed relay U1 is connected to the positive output port CH1-OUT+; one end of the coil terminal of the single-open single-closed relay U2 is connected to one end of resistor R2, the other end of resistor R2 is connected to the 12V power supply and the cathode of diode D6, and the other end of the coil terminal of the single-open single-closed relay U2 is connected to the anode of diode D6 and the second common terminal of the two closed relays JD01; one end of the switch terminal of the single-open single-closed relay U2 is connected to the negative input port CH1-IN-, and the other end of the switch terminal of the single-open single-closed relay U2 is connected to the negative output port CH1-OUT-.

[0007] The second control unit includes a two-on, two-off relay JD02, a single-on, single-off relay U5, and a single-on, single-off relay U6. The positive terminal of the coil of the two-off relay JD02 is connected to one end of resistor R9 and the negative terminal of diode D13, respectively. The other end of resistor R9 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD02 is adapted and connected to the control module to control the energization or de-energization of the coil of the two-off relay JD02. The anode of diode D13 is connected to the negative terminal of the coil of the two-off relay JD02. One end of the coil of the single-on, single-off relay U5 is connected to one end of resistor R5. The other end of resistor R5 is connected to a 12V power supply and the cathode of diode D9. The other end of the coil of the single-on, single-off relay U6 is connected to the anode of diode D9 and the negative terminal of diode D13. The first common terminal of the closed relay JD01 is connected; one end of the switch terminal of the single-open single-closed relay U5 is connected to the positive input port CH2-IN+, and the other end of the switch terminal of the single-open single-closed relay U5 is connected to the positive output port CH2-OUT+; one end of the coil terminal of the single-open single-closed relay U6 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the 12V power supply and the cathode of the diode D6, and the other end of the coil terminal of the single-open single-closed relay U6 is connected to the anode of the diode D10 and the second common terminal of the two closed relays JD02; one end of the switch terminal of the single-open single-closed relay U6 is connected to the negative input port CH2-IN-, and the other end of the switch terminal of the single-open single-closed relay U6 is connected to the negative output port CH2-OUT-.

[0008] The switching unit includes a two-on, two-off relay JD03, a single-on, single-off relay U3, and a single-on, single-off relay U4. The positive terminal of the coil of the two-off relay JD03 is connected to one end of resistor R8 and the negative terminal of diode D11, respectively. The other end of resistor R8 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD03 is adapted and connected to the control module to control the energization or de-energization of the coil of the two-off relay JD03. The anode of diode D11 is connected to the negative terminal of the coil of the two-off relay JD03. One end of the coil of the single-on, single-off relay U4 is connected to one end of resistor R3. The other end of resistor R3 is connected to a 12V power supply and the cathode of diode D7. The other end of the coil of the single-on, single-off relay U4 is connected to the anode of diode D7 and the negative terminal of diode D11. The first common terminal of the two closed relays JD03 is connected; one end of the switch terminal of the single open / closed relay U3 is connected to the positive input port CH1-IN+, and the other end of the switch terminal of the single open / closed relay U3 is connected to the positive input port CH2-IN+; one end of the coil terminal of the single open / closed relay U4 is connected to one end of resistor R4, the other end of resistor R4 is connected to the 12V power supply and the cathode of diode D8, and the other end of the coil terminal of the single open / closed relay U4 is connected to the anode of diode D8 and the second common terminal of the two closed relays JD03; one end of the switch terminal of the single open / closed relay U4 is connected to the negative input port CH1-IN-, and the other end of the switch terminal of the single open / closed relay U4 is connected to the negative input port CH2-IN-.

[0009] The above approach has the following advantages: 1. Because the positive and negative input ports of the channel sampling switching device of this utility model are both connected to the control module of the charging and discharging equipment through a sampling switching circuit, the sampling switching circuit is used to enable the control module to collect the voltage between the positive input port or negative output port and between the positive and negative output ports. This sampling switching device is directly and fixedly connected to the terminals of the charging and discharging channel, and the sampling of different working channels is achieved by automatic switching controlled by the control module, without manual operation, resulting in a high degree of automation. Moreover, because this sampling switching device is directly and fixedly connected to the terminals of the charging and discharging channel, the sampling position will not change, avoiding sampling errors caused by different resistances and improving sampling accuracy.

[0010] 2. The sampling switching unit of the channel sampling switching device of this utility model connects different charging and discharging channels, thereby enabling automatic sampling after different sampling channels are connected in parallel. Attached Figure Description

[0011] Figure 1 This is a structural topology diagram of the channel sampling switching device of this utility model; Figure 2 This is a schematic diagram of the sampling circuit in the channel sampling switching device of this utility model. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings.

[0013] like Figure 1 As shown, the channel sampling switching device of this utility model includes at least two charging and discharging channels. Each charging and discharging channel contains a positive wire and a negative wire. One end of the positive wire has a positive input port and the other end has a positive output port, and one end of the negative wire has a negative input port and the other end has a negative output port. There are connecting lines between the positive wires of different charging and discharging channels and between the negative wires of different charging and discharging channels. There are switches on the positive wires, negative wires, and connecting lines. Both the positive input port and the negative input port are connected to the control module 104 of the charging and discharging device through a sampling switching circuit 103. The sampling switching circuit 103 is used to enable the control module 104 to collect the voltage between the positive input port or the negative output port and between the positive output port and the negative output port.

[0014] like Figure 1As shown, in this embodiment, there are two charging and discharging channels, namely charging and discharging channel one 101 and charging and discharging channel two 102. The positive input port CH1-IN+ and the positive output port CH1-OUT+ of the positive line of charging and discharging channel one 101 are the same as those of charging and discharging channel one 101. The negative input port CH1-IN- and the negative output port CH1-OUT- of the negative line of charging and discharging channel two 102 are the same as those of charging and discharging channel two 102. There is a switch 1K1 between the positive input port CH1-IN+ and the positive output port CH1-OUT+; a switch 1K2 between the negative input port CH1-IN- and the negative output port CH1-OUT-; a switch 2K1 between the positive input port CH2-IN+ and the positive output port CH2-OUT+; a switch 2K2 between the negative input port CH2-IN- and the negative output port CH2-OUT-; a switch 3K1 between the positive input ports CH1-IN+ and CH2-IN+; and a switch 3K2 between the negative input ports CH1-IN- and CH2-IN-. During normal operation, switches 3K1 and 3K2 are open, and switches 1K1, 1K2, 2K1, and 2K2 are closed, allowing the two channels to operate independently. In parallel operation, the positive input port CH1-IN+ and the negative input port CH1-IN- are connected to the positive and negative terminals of one power supply, respectively, and the positive input port CH2-IN+ and the negative input port CH2-IN- are connected to the positive and negative terminals of the other power supply, respectively. Switches 1K1 and 1K2 are open, while switches 2K1, 2K2, 3K1, and 3K2 are closed. The negative input port CH2-OUT+ and the negative output port CH2-OUT- are connected to the load, thus enabling dual-channel simultaneous power supply to the load to meet high power requirements. The control module 104 can be a microcontroller; its specific model can be selected by those skilled in the art according to their needs, and is existing technology, so it will not be described in detail here.

[0015] In this embodiment, the sampling switching circuit 103 includes a first control unit, a second control unit, and a switching unit. The first control unit is located between the charging / discharging channel 101 and the control module 104, and is used to enable the control module 104 to collect the voltage between the positive input port CH1-IN+ and the positive output port CH1-OUT+, and the voltage between the negative input port CH1-IN- and the negative output port CH1-OUT- of the charging / discharging channel 101. The second control unit is located between the charging / discharging channel 2 102 and the control module 104, and is used to enable the control module 104 to collect the voltage between the positive input port CH2-IN+ and the positive output port CH2-OUT+, and the voltage between the negative input port CH2-IN- and the negative output port CH2-OUT- of the charging / discharging channel 2 102. The switching unit is adapted to be connected between the first control unit and the second control unit, and is used to enable the control module 104 to collect the voltage between the positive input port CH1-IN+ of the charging and discharging channel one 101 and the positive output port CH2-OUT+ of the charging and discharging channel two 102, and to collect the voltage between the negative input port CH1-IN- of the charging and discharging channel one 101 and the negative output port CH2-OUT- of the charging and discharging channel two 102.

[0016] In this embodiment, as Figure 2 As shown, the first control unit includes a two-on, two-off relay JD01, a single-on, single-off relay U1, and a single-on, single-off relay U2. The positive terminal of the coil of the two-off relay JD01 is connected to one end of resistor R7 and the negative terminal of diode D12, respectively. The other end of resistor R7 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD01 is adapted and connected to control module 104 to control the energization or de-energization of the coil of the two-off relay JD01. The anode of diode D12 is connected to the negative terminal of the coil of the two-off relay JD01. One end of the coil of the single-on, single-off relay U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to a 12V power supply and the cathode of diode D5. The other end of the coil of the single-on, single-off relay U1 is connected to the anode of diode D5 and the first common terminal of the two-off relay JD01, respectively. One end of the switch terminal of the single-open, single-closed relay U1 is connected to the positive input port CH1-IN+, and the other end is connected to the positive output port CH1-OUT+. One end of the coil terminal of the single-open, single-closed relay U2 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the 12V power supply and the cathode of diode D6. The other end of the coil terminal of the single-open, single-closed relay U2 is connected to the anode of diode D6 and the second common terminal of the two-closed relay JD01. One end of the switch terminal of the single-open, single-closed relay U2 is connected to the negative input port CH1-IN-, and the other end is connected to the negative output port CH1-OUT-.

[0017] In this embodiment, as Figure 2As shown, the second control unit includes a two-on, two-off relay JD02, a single-on, single-off relay U5, and a single-on, single-off relay U6. The positive terminal of the coil of the two-off relay JD02 is connected to one end of resistor R9 and the negative terminal of diode D13, respectively. The other end of resistor R9 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD02 is adapted and connected to control module 104 to control the energization or de-energization of the coil of the two-off relay JD02. The anode of diode D13 is connected to the negative terminal of the coil of the two-off relay JD02. One end of the coil of the single-on, single-off relay U5 is connected to one end of resistor R5. The other end of resistor R5 is connected to a 12V power supply and the cathode of diode D9. The other end of the coil of the single-on, single-off relay U5 is connected to the anode of diode D9 and the first common terminal of the two-off relay JD01, respectively. One end of the switch terminal of the single-open, single-closed relay U5 is connected to the positive input port CH2-IN+, and the other end is connected to the positive output port CH2-OUT+. One end of the coil terminal of the single-open, single-closed relay U6 is connected to one end of resistor R6, the other end of resistor R6 is connected to the 12V power supply and the cathode of diode D6, and the other end of the coil terminal of the single-open, single-closed relay U6 is connected to the anode of diode D10 and the second common terminal of the two-closed relay JD02. One end of the switch terminal of the single-open, single-closed relay U6 is connected to the negative input port CH2-IN-, and the other end is connected to the negative output port CH2-OUT-.

[0018] In this embodiment, as Figure 2As shown, the switching unit includes a two-on, two-off relay JD03, a single-on, single-off relay U3, and a single-on, single-off relay U4. The positive terminal of the coil of the two-off relay JD03 is connected to one end of resistor R8 and the negative terminal of diode D11, respectively. The other end of resistor R8 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD03 is adapted and connected to control module 104 to control the energization or de-energization of the coil of the two-off relay JD03. The anode of diode D11 is connected to the negative terminal of the coil of the two-off relay JD03. One end of the coil of the single-on, single-off relay U3 is connected to one end of resistor R3. The other end of resistor R3 is connected to a 12V power supply and the cathode of diode D7. The other end of the coil of the single-on, single-off relay U3 is connected to the anode of diode D7 and the first common terminal of the two-off relay JD03, respectively. One end of the switch terminal of the single-open, single-closed relay U3 is connected to the positive input port CH1-IN+, and the other end is connected to the positive input port CH2-IN+. One end of the coil terminal of the single-open, single-closed relay U4 is connected to one end of resistor R4, the other end of resistor R4 is connected to the 12V power supply and the cathode of diode D8, and the other end of the coil terminal of the single-open, single-closed relay U4 is connected to the anode of diode D8 and the second common terminal of the double-closed relay JD03. One end of the switch terminal of the single-open, single-closed relay U4 is connected to the negative input port CH1-IN-, and the other end is connected to the negative input port CH2-IN-.

[0019] In this embodiment, the negative terminals of the coils of the two-on-two-off relays JD01, JD02, and JD03 can be connected to the ground terminal through a MOS transistor switch, respectively. The control module 104 is connected to the gate of the three MOS transistor switches to control the MOS transistors to turn on or off, thereby energizing or de-energizing the coils and realizing sampling switching. The specific circuit structure is existing technology and will not be described in detail here.

[0020] During operation, when charge / discharge channel 101 is working normally, switches 1K1 and 1K2 are closed, energizing the coil of the two-on-two-off relay JD01. The coils of the single-off relay U1 and the single-on-single-off relay U2 are also energized, closing their switches and enabling voltage sampling between the positive input port CH1-IN+ and the positive output port CH1-OUT+, and between the negative input port CH1-IN- and the positive output port CH1-OUT-. The process of charge / discharge channel 102 during normal operation is the same as that of charge / discharge channel 101.

[0021] When operating in parallel, the positive input port CH1-IN+ and the negative input port CH1-IN- are connected to the positive and negative terminals of one power source, respectively, and the positive input port CH2-IN+ and the negative input port CH2-IN- are connected to the positive and negative terminals of another power source, respectively. Switches 1K1 and 1K2 are open, and switches 2K1, 2K2, 3K1, and 3K2 are closed. The negative input port CH2-OUT+ and the negative output port CH2-OUT- are connected to the load. At this time, the coil of the two-on-two-off relay JD01 is not energized, while the coils of the two-on-two-off relays JD02 and JD03 are energized. The switches of the single-off relays U3, U4, U5, and U5 are closed, realizing voltage sampling from the positive input terminal CH1-IN+ to the positive input terminal CH2-IN+ and then to the positive output terminal CH2-OUT+. At the same time, voltage sampling is realized from the negative input terminal CH1-IN- to the negative input terminal CH2-IN- and then to the negative output terminal CH2-OUT-.

[0022] This utility model's channel sampling switching device is directly and fixedly connected to the terminals of the charging and discharging channels. The control module automatically switches between different working channels to achieve sampling, eliminating the need for manual operation and achieving a high degree of automation. Furthermore, this sampling switching device's direct and fixed connection to the terminals of the charging and discharging channels prevents changes in the sampling position, avoiding sampling errors caused by varying resistances and improving sampling accuracy. Moreover, this channel sampling switching device utilizes a sampling switching unit to connect different charging and discharging channels, enabling automatic sampling after parallel operation of different sampling channels.

Claims

1. A channel sampling switching device, comprising at least two charging / discharging channels, each channel containing a positive wire and a negative wire, the positive wire having a positive input port at one end and a positive output port at the other end, and the negative wire having a negative input port at one end and a negative output port at the other end; connecting lines exist between the positive wires of different charging / discharging channels and between the negative wires of different charging / discharging channels; each of the positive wire, negative wire, and connecting lines has a switch; characterized in that, Both the positive input port and the negative input port are connected to the control module of the charging and discharging device through a sampling switching circuit. The sampling switching circuit is used to enable the control module to collect the voltage between the positive input port or the negative output port and the positive output port and the negative output port.

2. The channel sampling switch device of claim 1, wherein, There are two charging / discharging channels, namely charging / discharging channel one and charging / discharging channel two. The sampling switching circuit includes a first control unit, a second control unit, and a switching unit. The first control unit is located between charging / discharging channel one and the control module, and is used to enable the control module to collect the voltage between the positive input port CH1-IN+ and the positive output port CH1-OUT+, and the voltage between the negative input port CH1-IN- and the negative output port CH1-OUT- of charging / discharging channel one. The second control unit is located between charging / discharging channel two and the control module, and is used to enable the control module to collect the charging / discharging voltage. The voltage between the positive input port CH2-IN+ and the positive output port CH2-OUT+ of channel two, and the voltage between the negative input port CH2-IN- and the negative output port CH2-OUT-; the switching unit is adapted to be connected between the first control unit and the second control unit, and is used to enable the control module to collect the voltage between the positive input port CH1-IN+ of charging and discharging channel one and the positive output port CH2-OUT+ of charging and discharging channel two, and to collect the voltage between the negative input port CH1-IN- of charging and discharging channel one and the negative output port CH2-OUT- of charging and discharging channel two.

3. The channel sampling switch device of claim 2, wherein, The first control unit includes a two-on, two-off relay JD01, a single-on, single-off relay U1, and a single-on, single-off relay U2. The positive terminal of the coil of the two-off relay JD01 is connected to one end of resistor R7 and the negative terminal of diode D12, respectively. The other end of resistor R7 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD01 is adapted and connected to the control module to control the energization or de-energization of the coil of the two-off relay JD01. The anode of diode D12 is connected to the negative terminal of the coil of the two-off relay JD01. One end of the coil of the single-on, single-off relay U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to a 12V power supply and the cathode of diode D12. The other end of the coil of the single-on, single-off relay U1 is connected to the anode of diode D5 and the negative terminal of the two-off relay U2. The first common terminal of the closed relay JD01 is connected; one end of the switch terminal of the single-open single-closed relay U1 is connected to the positive input port CH1-IN+, and the other end of the switch terminal of the single-open single-closed relay U1 is connected to the positive output port CH1-OUT+; one end of the coil terminal of the single-open single-closed relay U2 is connected to one end of resistor R2, the other end of resistor R2 is connected to the 12V power supply and the cathode of diode D6, and the other end of the coil terminal of the single-open single-closed relay U2 is connected to the anode of diode D6 and the second common terminal of the two closed relays JD01; one end of the switch terminal of the single-open single-closed relay U2 is connected to the negative input port CH1-IN-, and the other end of the switch terminal of the single-open single-closed relay U2 is connected to the negative output port CH1-OUT-.

4. The channel sampling switching device as described in claim 3, characterized in that, The second control unit includes a two-on, two-off relay JD02, a single-on, single-off relay U5, and a single-on, single-off relay U6. The positive terminal of the coil of the two-off relay JD02 is connected to one end of resistor R9 and the negative terminal of diode D13, respectively. The other end of resistor R9 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD02 is adapted and connected to the control module to control the energization or de-energization of the coil of the two-off relay JD02. The anode of diode D13 is connected to the negative terminal of the coil of the two-off relay JD02. One end of the coil of the single-on, single-off relay U5 is connected to one end of resistor R5. The other end of resistor R5 is connected to a 12V power supply and the cathode of diode D9. The other end of the coil of the single-on, single-off relay U6 is connected to the anode of diode D9 and the negative terminal of diode D13. The first common terminal of the closed relay JD01 is connected; one end of the switch terminal of the single-open single-closed relay U5 is connected to the positive input port CH2-IN+, and the other end of the switch terminal of the single-open single-closed relay U5 is connected to the positive output port CH2-OUT+; one end of the coil terminal of the single-open single-closed relay U6 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the 12V power supply and the cathode of the diode D6, and the other end of the coil terminal of the single-open single-closed relay U6 is connected to the anode of the diode D10 and the second common terminal of the two closed relays JD02; one end of the switch terminal of the single-open single-closed relay U6 is connected to the negative input port CH2-IN-, and the other end of the switch terminal of the single-open single-closed relay U6 is connected to the negative output port CH2-OUT-.

5. The channel sampling switching device as described in claim 4, characterized in that, The switching unit includes a two-on, two-off relay JD03, a single-on, single-off relay U3, and a single-on, single-off relay U4. The positive terminal of the coil of the two-off relay JD03 is connected to one end of resistor R8 and the negative terminal of diode D11, respectively. The other end of resistor R8 is connected to a 15V power supply. The negative terminal of the coil of the two-off relay JD03 is adapted and connected to the control module to control the coil of the two-off relay JD03 to be energized or de-energized. The anode of diode D11 is connected to the negative terminal of the coil of the two-off relay JD03. One end of the coil of the single-open, single-closed relay U3 is connected to one end of resistor R3, and the other end of resistor R3 is connected to a 12V power supply and the cathode of diode D7. The other end of the coil of the single-open, single-closed relay U3 is connected to the anode of diode D7 and the first common terminal of the double-closed relay JD03. One end of the switch of the single-open, single-closed relay U3 is connected to the positive input port CH1-IN+, and the other end of the switch of the single-open, single-closed relay U3 is connected to the positive input port CH2-IN+. One end of the coil of the single-open, single-closed relay U4 is connected to one end of resistor R4, and the other end of resistor R4 is connected to a 12V power supply and the cathode of diode D8. The other end of the coil of the single-open, single-closed relay U4 is connected to the anode of diode D8 and the second common terminal of the double-closed relay JD03. One end of the switch of the single-open, single-closed relay U4 is connected to the negative input port CH1-IN-, and the other end of the switch of the single-open, single-closed relay U4 is connected to the negative input port CH2-IN-.

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