A four-quadrant automatic calibrator and its calibration switching sampling module

Abstract

This utility model discloses a four-quadrant automatic calibrator and its calibration switching sampling module. The calibration switching sampling module includes channel access terminals, multimeter connection terminals, a power control unit, a resistor selection unit, an access switch unit, a first access switching unit, a second access switching unit, and a third access switching unit. The channel access terminals are connected to the power control unit, the resistor selection unit, and the multimeter connection terminals through the access switch unit, the first access switching unit, the second access switching unit, and the third access switching unit. This utility model's calibration switching sampling module features positive voltage charging calibration mode, positive voltage discharging calibration mode, negative voltage charging calibration mode, negative voltage discharging calibration mode, current charging calibration mode, and current discharging calibration mode, providing rich and comprehensive calibration functions.

Description

Technical Field

[0001] This utility model relates to the field of battery charging and discharging equipment calibration, and in particular to a four-quadrant automatic calibrator and its calibration switching sampling module. Background Technology

[0002] In the production process of existing batteries, battery charging and discharging equipment is required to charge and discharge the batteries, thereby activating them through formation and capacity testing. To ensure that the voltage and current of the battery charging and discharging equipment meet the required accuracy, it needs to be calibrated periodically.

[0003] Existing calibration systems for calibrating battery charging and discharging equipment generally include a host computer, an automatic calibrator, and a multimeter. The host computer is communicatively connected to the automatic calibrator and the digital multimeter. The automatic calibrator typically includes a calibration switching sampling module, a channel switching module, a control module, and multiple test channels. Each test channel is connected to the calibration switching sampling module via a channel switching module. The calibration switching sampling module is connected to the digital multimeter. The control module is connected to both the calibration switching sampling module and the channel switching module to control them respectively. Specifically, when calibrating battery charging and discharging equipment, each charging and discharging channel of the equipment is connected to its respective test channel of the automatic calibrator. The multimeter is connected to the calibration switching sampling module. The host computer is communicatively connected to the control module, the multimeter, and the battery charging and discharging equipment. The specific calibration process is as follows: The host computer controls the channel switching module through the control module, so that each test channel is connected to the calibration switching sampling module in sequence; After each test channel is connected to the calibration switching sampling module, the host computer controls the calibration switching sampling module through the control module, enabling the calibration switching sampling module to switch between positive voltage charging calibration mode, positive voltage discharging calibration mode, current charging calibration mode, and current discharging calibration mode. At the same time, the host computer controls the charging and discharging device to enter the corresponding positive voltage charging, positive voltage discharging, current charging, and current discharging states of the corresponding connected charging and discharging channels. The host computer also controls the digital multimeter to switch between the corresponding voltage and current ranges to perform voltage or current detection. The host computer calibrates the voltage and current of the battery charging and discharging device based on the detection values ​​of the digital multimeter, thereby performing positive voltage charging calibration, positive voltage discharging calibration, current charging calibration, and current discharging calibration on the charging and discharging channels of the battery charging and discharging device connected to the corresponding connected test channel.

[0004] As can be seen from the above, the existing automatic calibrator's calibration switching sampling module can only perform positive voltage charging calibration, positive voltage discharging calibration, current charging calibration, and current discharging calibration on battery charging and discharging equipment, which has certain limitations. It cannot perform negative voltage calibration on existing battery charging and discharging equipment that also has negative voltage discharging and negative voltage charging functions.

[0005] In view of the above problems, it is necessary to study a four-quadrant automatic calibrator and its calibration switching sampling module to overcome the shortcomings of the existing technology. Utility Model Content

[0006] The purpose of this invention is to provide a four-quadrant automatic calibrator and its calibration switching sampling module to overcome the shortcomings of the prior art.

[0007] To achieve the above objectives, the solution of this utility model is: A calibration switching sampling module includes channel access terminals, multimeter connection terminals, a power control unit, a resistor selection unit, an access switch unit, a first access switching unit, a second access switching unit, and a third access switching unit. The channel access terminals have V+, V-, I+, and I- terminals; the V+ and I+ terminals are connected, and the V- and I- terminals are connected. The multimeter connection terminals have HI, LO, and A1 terminals. The HI and LO terminals of the multimeter connection terminals are respectively connected to the V+ and V- terminals of the channel access terminals via the access switch units. The control unit controls whether the HI terminal of the multimeter connection terminal is connected to the V+ terminal of the channel access terminal. The connection switch unit also controls whether the LO terminal of the multimeter connection terminal is connected to the V- terminal of the channel access terminal. The power control unit includes a power supply unit, a first power control relay, a second power control relay, and a third power control relay. The power supply unit can output positive and negative voltages. The first normally closed contact of the first power control relay and the first normally open contact of the second power control relay are connected to the positive output terminal of the power supply unit. The first moving contact of the first power control relay is connected to the negative output terminal of the power supply unit, and the first normally open contact of the third power control relay is connected to the first power control relay. The first access switching unit includes a first access switching relay, the second access switching unit includes a second access switching relay, and the third access switching unit includes a third access switching relay. The resistor selection unit has multiple resistors with different resistance values ​​that can be selectively connected. The first end of the resistor selection unit is connected to the first normally closed contact of the first access switching relay, and the second end of the resistor selection unit is connected to the first normally closed contact of the second access switching relay. The first normally open contact of the first access switching relay is connected to the A1 terminal of the multimeter connection terminal, and the second normally closed contact of the second access switching relay is connected to the LO terminal of the multimeter connection terminal. The first moving contact of the first access switching relay is connected to the I+ terminal of the channel access terminal, and the first moving contact of the second access switching relay is connected to the first normally closed contact of the third access switching relay. The first normally closed contact of the third access switching relay is also connected to the first moving contact of the third power control relay, and the first normally open contact of the third access switching relay is connected to the first moving contact of the second power control relay. The first moving contact of the third access switching relay is connected to the V- terminal of the channel access terminal.

[0008] The multimeter connection terminal also has an A2 terminal. The first normally open contact of the first access switching relay and the first normally open contact of the second access switching relay are connected to the LO terminal, A1 terminal, and A2 terminal of the multimeter connection terminal through the current range selection unit. The current range selection unit includes a first current range relay, a second current range relay, a third current range relay, and a shunt interface. The first moving contact of the first range relay is connected to the first normally open contact of the first access switching relay, and the first normally closed contact of the first current range relay is connected to the first moving contact of the second current range relay. The first normally open and first normally closed contacts of the two current range relays are connected to terminals A1 and A2 of the multimeter connection terminals, respectively. The first moving contact of the third current range relay is connected to the first normally open contact of the second input switching relay. The first moving contact of the third current range relay is connected to the first normally closed contact of the second input switching relay. The first normally closed contact of the third current range relay is connected to the LO terminal of the multimeter connection terminals. The first end of the shunt interface is connected to the first normally open contact of the first current range relay, and the second end of the shunt interface is connected to the first normally open contact of the third current range relay.

[0009] The resistor selection unit includes a first resistor selection relay, a second resistor selection relay, a first resistor, a second resistor, and a third resistor, each with a different resistance value. The first moving contact of the first resistor selection relay is connected to the first terminal of the resistor selection unit; the first normally open contact of the first resistor selection relay is connected to the first moving contact of the second resistor selection relay; the first normally closed contact of the first resistor selection relay is connected to the first terminal of the first resistor; the second terminal of the first resistor is connected to the second normally open contact of the first resistor selection relay; the second moving contact of the first resistor selection relay is connected to the second terminal of the resistor selection unit; the second normally closed contact of the first resistor selection relay is connected to the second moving contact of the second resistor selection relay; the second normally open contact of the second resistor selection relay is connected to the first terminal of the second resistor; the second terminal of the second resistor is connected to the first normally open contact of the second resistor selection relay; the first normally closed contact of the second resistor selection relay is connected to the first terminal of the third resistor; and the second terminal of the third resistor is connected to the second normally closed contact of the second selection relay.

[0010] The power supply unit includes a first power supply, a second power supply, a first power switch relay, and a second power switch relay. The output currents of the first power supply and the second power supply are different. The positive and negative output terminals of the first power supply are respectively connected to the first normally closed contact of the first power switch relay and the first normally closed contact of the second power switch relay. The positive and negative output terminals of the second power supply are respectively connected to the first normally open contact of the first power switch relay and the first normally open contact of the second power switch relay. The first moving contact of the first power switch relay and the first moving contact of the second power switch relay are respectively connected to the positive and negative output terminals of the power supply unit.

[0011] The access switch unit includes a first access switch relay and a second access switch relay. The first moving contact of the first access switch relay is connected to the HI terminal of the multimeter connection terminal, the second moving contact of the first access switch relay is connected to the LO terminal of the multimeter connection terminal, the first normally open contact of the first access switch relay is connected to the moving contact of the second access switch relay, the second normally closed contact of the second access switch relay is connected to the V+ terminal of the channel access terminal, the second normally open contact of the first access switch relay is connected to the moving contact of the second access switch relay, and the second normally closed contact of the second access switch relay is connected to the V- terminal of the channel access terminal.

[0012] The calibration switching sampling module further includes a power selection unit and a grounding switch unit; the power selection unit is used to apply different voltages to the V+ terminal of the channel access terminal, and the grounding switch unit is used to control whether the V- terminal of the channel access terminal is grounded; the V+ and V- terminals of the channel access terminal are connected to the I+ and I- terminals of the channel access terminal through a connection switch unit, and the connection switch unit controls whether the V+ and I+ terminals of the channel access terminal are connected or not, and the connection switch unit controls whether the V- and I+ terminals of the channel access terminal are connected or not.

[0013] The connection switch unit includes a connection switch relay, the first moving contact of the connection switch relay is connected to the V+ terminal of the channel access terminal, the first normally closed contact of the connection switch relay is connected to the I+ terminal of the channel access terminal, the second moving contact of the connection switch relay is connected to the V- terminal of the channel access terminal, and the second normally closed contact of the connection switch relay is connected to the I- terminal of the channel access terminal.

[0014] The power selection unit includes a first power selection relay, a second power selection relay, and a multi-voltage power supply with multiple output voltages. The moving contact of the first power selection relay is connected to the first normally open contact of the connecting switch relay. The normally closed contact and normally open contact of the first power selection relay are respectively connected to the first moving contact and the second moving contact of the second power selection relay. The first normally closed contact, the first normally open contact, the second normally closed contact, and the second normally open contact of the second power selection relay are respectively connected to multiple output terminals of the multi-voltage power supply.

[0015] The grounding switch unit includes a grounding switch relay. The second moving contact of the grounding switch relay is connected to the second normally open contact of the connection switch relay, and the second normally closed contact of the grounding switch relay is grounded. The moving contact of the first power selection relay is connected to the first normally open contact of the connection switch relay through the grounding switch relay. The first moving contact of the grounding switch relay is connected to the first normally open contact of the connection switch relay, and the first normally closed contact of the grounding switch relay is connected to the moving contact of the first power selection relay.

[0016] A four-quadrant automatic calibrator having a calibration switching sampling module as described above.

[0017] After adopting the above scheme, the calibration switching sampling module of this utility model has positive voltage charging calibration mode, positive voltage discharging calibration mode, negative voltage charging calibration mode, negative voltage discharging calibration mode, current charging calibration mode and current discharging calibration mode, which can calibrate battery charging and discharging equipment with positive voltage charging state, positive voltage discharging state, negative voltage charging state, negative voltage discharging state, current charging state and current discharging state, thus overcoming the shortcomings of the prior art. Attached Figure Description

[0018] Figure 1 This is a block diagram illustrating the principle of the four-quadrant automatic calibrator of this utility model.

[0019] Figure 2 This is a circuit diagram of the calibration switching sampling module of this utility model when it is in positive voltage charging calibration mode and negative voltage discharging calibration mode (the control coils of each relay are hidden).

[0020] Figure 3 This is a circuit diagram of the calibration switching sampling module of this utility model when it is in positive voltage discharge calibration mode (the control coils of each relay are hidden).

[0021] Figure 4 This is a circuit diagram of the calibration switching sampling module of this utility model when it is in negative voltage charging calibration mode (the control coils of each relay are hidden).

[0022] Figure 5 This is a circuit diagram of the calibration switching sampling module of this utility model when it is in current charging calibration mode and current discharging calibration mode (the control coils of each relay are hidden).

[0023] Figure 6 This is a circuit diagram of the calibration switching sampling module of this utility model when it is in voltage calibration mode (the control coils of each relay are hidden).

[0024] Label Explanation: Calibration switching sampling module 1, channel switching module 2, control module 3, test channel 4. Channel access terminal A, Connect the multimeter to terminal B. Power control unit C, power unit C1, first power supply C11, second power supply C12, first power switch relay C13, second power switch relay C14, first power control relay C2, second power control relay C3, third power control relay C4. Resistor selection unit D, first resistor selection relay D1, second resistor selection relay D2, first resistor D3, second resistor D4, third resistor D5. Connect to switch unit E, first connect to switch relay E1, second connect to switch relay E2. First access switching unit F, first access switching relay F1 Second access switching unit G, second access switching relay G1 Third access switching unit H, third access switching relay H1 Current range selection unit J, first current range relay J1, second current range relay J2, third current range relay J3, shunt interface J4. Power selection unit K, first power selection relay K1, second power selection relay K2, multi-voltage power supply K3. Grounding switch unit L, grounding switch relay L1, Connect the switch unit M and the switch relay M1. Detailed Implementation

[0025] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0026] like Figures 1 to 6 As shown, this utility model discloses a four-quadrant automatic calibrator, which includes a calibration switching sampling module 1, a channel switching module 2, a control module 3, and multiple test channels 4. Each test channel 4 is connected to the calibration switching sampling module 1 through the channel switching module 2. The control module 3 is connected to the calibration switching sampling module 1 and the channel switching module 2 respectively to control the calibration switching sampling module 1 and the channel switching module 2 respectively.

[0027] The key difference between the four-quadrant automatic calibrator of this invention and existing automatic calibrators lies in the different calibration switching sampling module 1.

[0028] Specifically, in the embodiments of this utility model, the calibration switching sampling module 1 includes a channel access terminal A, a multimeter connection terminal B, a power control unit C, a resistor selection unit D, an access switch unit E, a first access switching unit F, a second access switching unit G, and a third access switching unit H. The channel access terminal A is used to connect to the channel switching module 2. The channel access terminal A has a V+ terminal, a V- terminal, an I+ terminal, and an I- terminal. The V+ terminal and the I+ terminal of the channel access terminal A are connected, and the V- terminal and the I- terminal of the channel access terminal A are connected. The multimeter connection terminal B is used to connect to a digital multimeter. The multimeter connection terminal B has an HI terminal, a LO terminal, and an A1 terminal. The HI terminal and the LO terminal of the multimeter connection terminal B are respectively connected to the V+ terminal and the V- terminal of the channel access terminal A through the access switch unit E. The access switch unit E is controlled by the control module 3, and the access switch unit E controls the HI terminal of the multimeter connection terminal B. The connection switch unit E controls whether the V+ terminal of the multimeter connection terminal B is connected to the V- terminal of the channel access terminal A. The power control unit C includes a power unit C1, a first power control relay C2, a second power control relay C3, and a third power control relay C4. The first power control relay C2, the second power control relay C3, and the third power control relay C4 are controlled by the control module 3. The power unit C1 can output positive and negative voltages. The first normally closed contact of the first power control relay C2 and the first normally open contact of the second power control relay C3 are connected to the positive output terminal of the power unit C1. The first normally open contact of the first power control relay C2 and the first normally closed contact of the second power control relay C3 are connected to the negative output terminal of the power unit C1. The first moving contact of the first power control relay C2 is connected to the first normally open contact of the third power control relay C4.The first access switching unit F includes a first access switching relay F1, the second access switching unit G includes a second access switching relay G1, the third access switching unit H includes a third access switching relay H1, and the resistor selection unit D has multiple selectable resistors with different resistance values. The first access switching relay F1, the second access switching relay G1, the third access switching relay H1, and the resistor selection unit D are controlled by the control module 3. The first terminal of the resistor selection unit D is connected to the first normally closed contact of the first access switching relay F1, and the second terminal of the resistor selection unit D is connected to the first normally closed contact of the second access switching relay G1. The open contact is connected to terminal A1 of multimeter connection terminal B; the second normally closed contact of the second access switching relay G1 is connected to terminal LO of multimeter connection terminal B; the first moving contact of the first access switching relay F1 is connected to terminal I+ of channel access terminal A; the first moving contact of the second access switching relay G1 is connected to the first normally closed contact of the third access switching relay H1; the first normally closed contact of the third access switching relay H1 is also connected to the first moving contact of the third power control relay C4; the first normally open contact of the third access switching relay H1 is connected to the first moving contact of the second power control relay C3; and the first moving contact of the third access switching relay H1 is connected to terminal V- of channel access terminal A.

[0029] The calibration switching sampling module 1 of this utility model has multiple calibration modes, and its specific working principle is as follows: Cooperate Figure 2 As shown, when the calibration switching sampling module 1 of this utility model enters the positive voltage charging calibration mode, the V+ and I+ terminals of channel access terminal A are connected, the V- and I- terminals of channel access terminal A are connected, and the access switch unit E is turned on, so that the HI and LO terminals of the multimeter connection terminal B are connected to the V+ and V- terminals of channel access terminal A respectively. The first moving contact and the first normally closed contact of the first access switching relay F1 are turned on, the first moving contact and the first normally closed contact of the second access switching relay G1 are turned on, and the first moving contact and the first normally closed contact of the third access switching relay H1 are turned on. The third power control relay... The first moving contact and the first normally closed contact of device C4 are turned on; thus, power supply unit C1 is not connected to channel access terminal A, and the HI and LO terminals of multimeter connection terminal B are connected to the V+ and V- terminals of channel access terminal A respectively, enabling the digital multimeter connected to multimeter connection terminal B to perform voltage measurement. Resistor selection unit D is connected to the V+ and V- terminals of channel access terminal A, and resistor selection unit D selects a resistor of appropriate resistance value according to the current voltage detection range to ensure accurate voltage measurement; while the battery charging and discharging equipment connected to channel access terminal A through channel switching module 2 and test channel 4 is in a positive voltage charging state. Cooperate Figure 3As shown, when the calibration switching sampling module 1 of this utility model enters the positive voltage discharge calibration mode, the V+ and I+ terminals of channel access terminal A are connected, the V- and I- terminals of channel access terminal A are connected, and the access switch unit E is turned on, so that the HI and LO terminals of the multimeter connection terminal B are connected to the V+ and V- terminals of channel access terminal A respectively. The first moving contact and the first normally closed contact of the first access switching relay F1 are turned on, the first moving contact and the first normally closed contact of the second access switching relay G1 are turned on, the first moving contact and the first normally open contact of the third access switching relay H1 are turned on, the first moving contact and the first normally open contact of the first power control relay C2 are turned on, and the first moving contact and the first normally open contact of the second power control relay C3 are turned on. When the circuit is open, the first moving contact and the first normally open contact of the third power control relay C4 are connected. This allows the multimeter connected to the digital multimeter connected to terminal B to perform voltage measurement. The negative output terminal of power supply unit C1 is connected to the V+ and I+ terminals of channel access terminal A via resistor selection unit D, and the positive output terminal of power supply unit C1 is connected to the V- and I- terminals of channel access terminal A. Resistor selection unit D selects a resistor of appropriate value based on the current voltage detection range to ensure accurate voltage measurement. Meanwhile, the battery charging / discharging equipment connected to channel access terminal A via channel switching module 2 and test channel 4 needs to be in a positive voltage discharge state at this time. Cooperate Figure 4As shown, when the calibration switching sampling module 1 of this utility model enters the negative voltage charging calibration mode, the V+ and I+ terminals of channel access terminal A are connected, the V- and I- terminals of channel access terminal A are connected, and the access switch unit E is turned on, so that the HI and LO terminals of the multimeter connection terminal B are connected to the V+ and V- terminals of channel access terminal A respectively. The first moving contact and the first normally closed contact of the first access switching relay F1 are turned on, the first moving contact and the first normally closed contact of the second access switching relay G1 are turned on, the first moving contact and the first normally open contact of the third access switching relay H1 are turned on, the first moving contact and the first normally closed contact of the first power control relay C2 are turned on, and the first moving contact and the first normally closed contact of the second power control relay C3 are turned on. When the circuit is open, the first moving contact and the first normally open contact of the third power control relay C4 are connected. This allows the HI and LO terminals of the multimeter connection terminal B to connect to the V+ and V- terminals of the channel access terminal A, respectively, enabling the digital multimeter connected to the multimeter connection terminal B to perform voltage measurement. The negative output terminal of the power supply unit C1 is connected to the V- and I- terminals of the channel access terminal A, and the positive output terminal of the power supply unit C1 is connected to the V+ and I+ terminals of the channel access terminal A through the resistor selection unit D. The resistor selection unit D selects a resistor of appropriate value according to the current voltage detection range to ensure accurate voltage measurement. Meanwhile, the battery charging / discharging equipment connected to the channel access terminal A through the channel switching module 2 and the test channel 4 needs to be in a negative voltage charging state at this time. Cooperate Figure 2 As shown, when the calibration switching sampling module 1 of this utility model enters the negative voltage discharge calibration mode, the V+ and I+ terminals of channel access terminal A are connected, the V- and I- terminals of channel access terminal A are connected, and the access switch unit E is turned on, so that the HI and LO terminals of the multimeter connection terminal B are connected to the V+ and V- terminals of channel access terminal A respectively. The first moving contact and the first normally closed contact of the first access switching relay F1 are turned on, the first moving contact and the first normally closed contact of the second access switching relay G1 are turned on, the first moving contact and the first normally closed contact of the third access switching relay H1 are turned on, and the third power control relay C... The first moving contact and the first normally closed contact of terminal 4 are connected; thus, the HI and LO terminals of the multimeter connection terminal B are connected to the V+ and V- terminals of the channel access terminal A, respectively, enabling the digital multimeter connected to the multimeter connection terminal B to perform voltage measurement. The power supply unit C1 is not connected to the channel access terminal A. The resistor selection unit D is connected to the V+ and V- terminals of the channel access terminal A. The resistor selection unit D selects the appropriate resistance value according to the current voltage detection range to ensure accurate voltage measurement. Meanwhile, the battery charging and discharging equipment connected to the channel access terminal A through the channel switching module 2 and the test channel 4 needs to be in a negative voltage discharge state at this time. Cooperate Figure 5As shown, when the calibration switching sampling module 1 of this utility model enters the current charging calibration mode, the V+ and I+ terminals of channel access terminal A are connected, the V- and I- terminals of channel access terminal A are connected, the access switch unit E is disconnected, the first moving contact and the first normally open contact of the first access switching relay F1 are connected, the first moving contact and the first normally open contact of the second access switching relay G1 are connected, the first moving contact and the first normally closed contact of the third access switching relay H1 are connected, and the first moving contact and the first normally closed contact of the third power control relay C4 are connected. In this way, the A1 and LO terminals of the multimeter connection terminal B are connected to the I+ and I- terminals of channel access terminal A, respectively, so that the digital multimeter connected to the multimeter connection terminal B can perform current measurement. The power supply unit C1 and the resistor selection unit D are not connected to channel access terminal A. The battery charging and discharging equipment connected to channel access terminal A through channel switching module 2 and test channel 4 needs to be in the current charging state at this time. Cooperate Figure 5 As shown, when the calibration switching sampling module 1 of this utility model enters the current discharge calibration mode, the V+ and I+ terminals of channel access terminal A are connected, the V- and I- terminals of channel access terminal A are connected, the access switch unit E is disconnected, the first moving contact and the first normally open contact of the first access switching relay F1 are connected, the first moving contact and the first normally open contact of the second access switching relay G1 are connected, the first moving contact and the first normally closed contact of the third access switching relay H1 are connected, and the first moving contact and the first normally closed contact of the third power control relay C4 are connected. In this way, the A1 and LO terminals of the multimeter connection terminal B are connected to the I+ and I- terminals of channel access terminal A, respectively, so that the digital multimeter connected to the multimeter connection terminal B can perform current measurement. The power supply unit C1 and the resistor selection unit D are not connected to the channel access terminal A. The battery charging and discharging equipment connected to the channel access terminal A through the channel switching module 2 and the test channel 4 needs to be in the current discharge state at this time.

[0030] As can be seen from the above, the calibration switching sampling module 1 of this utility model has positive voltage charging calibration mode, positive voltage discharging calibration mode, negative voltage charging calibration mode, negative voltage discharging calibration mode, current charging calibration mode and current discharging calibration mode, which can calibrate battery charging and discharging equipment with positive voltage charging state, positive voltage discharging state, negative voltage charging state, negative voltage discharging state, current charging state and current discharging state, thus overcoming the shortcomings of the prior art.

[0031] In an embodiment of this utility model, the multimeter connection terminal B further has an A2 terminal. Terminals A1 and A2 of the multimeter connection terminal B are used to connect to different current ranges of the digital multimeter. Specifically, terminal A1 of the multimeter connection terminal B can be used to connect to the 3A current range of the digital multimeter, and terminal A2 of the multimeter connection terminal B can be used to connect to the 10A current range of the digital multimeter. The first normally open contact of the first access switching relay F1 and the first normally open contact of the second access switching relay G1 are connected to terminals LO, A1, and A2 of the multimeter connection terminal B via the current range selection unit J. Thus, during current charging calibration or current discharging calibration, one of terminals A1 and A2 of the multimeter connection terminal B can be selected to connect to the V+ terminal of the channel access terminal A, adapting to battery charging and discharging devices with different currents. The current range selection unit J may include a first current range relay J1, a second current range relay J2, a third current range relay J3, and a shunt interface J4. The first current range relay J1, the second current range relay J2, and the third current range relay J3 are controlled by the control module 3. The first moving contact of the first current range relay J1 is connected to the first normally open contact of the first access switching relay F1, and the first normally closed contact of the first current range relay J1 is connected to the first moving contact of the second current range relay J2. The first normally open contact and the first normally closed contact of the second current range relay J2 are respectively connected to the multimeter connection terminals. Terminals A1 and A2 of sub-B are connected as follows: the first moving contact of the third current range relay J3 is connected to the first normally open contact of the second access switching relay G1; the first moving contact of the third current range relay J3 is connected to the first normally closed contact of the second access switching relay G1; the first normally closed contact of the third current range relay J3 is connected to the LO terminal of multimeter connection terminal B; the first end of shunt interface J4 is connected to the first normally open contact of the first current range relay J1; the second end of shunt interface J4 is connected to the first normally open contact of the third current range relay J3; shunt interface J4 is used to connect a shunt to adapt to the current range corresponding to terminal A2.When the current range selection unit J is in the low current range selection state, the first moving contact and the first normally closed contact of the first range relay are connected, the first moving contact and the first normally closed contact of the second range relay are connected, and the first moving contact and the first normally closed contact of the third range relay are connected. At this time, the A1 terminal of the multimeter connection terminal B is connected to the first normally open contact of the first access switching relay F1, and the LO terminal of the multimeter connection terminal B is connected to the first normally open contact of the second access switching relay G1. However, when the current range selection unit J is in the high current range selection state, the first moving contact and the first normally open contact of the first range relay are connected, and the second... When the first moving contact and the first normally open contact of the range relay are connected, and the first moving contact and the first normally open contact of the third range relay are connected, the A2 terminal of the multimeter connection terminal B and the first terminal of the shunt interface J4 are connected to the first normally open contact of the first access switching relay F1, and the LO terminal of the multimeter connection terminal B and the second terminal of the shunt interface J4 are connected to the first normally open contact of the second access switching relay G1. In this way, the shunt connected to the shunt interface J4 can be connected in parallel with the channel access terminal A to perform the function of shunt current, ensuring that the digital multimeter can accurately detect the current; the shunt connected to the shunt interface J4 can use a 10 milliohm resistor.

[0032] In an embodiment of this utility model, the power supply unit C1 includes a first power supply C11, a second power supply C12, a first power switch relay C13, and a second power switch relay C14. The output currents of the first power supply C11 and the second power supply C12 are different. The positive and negative output terminals of the first power supply C11 are respectively connected to the first normally closed contact of the first power switch relay C13 and the first normally closed contact of the second power switch relay C14. The positive and negative output terminals of the second power supply C12 are respectively connected to the first normally open contact of the first power switch relay C13 and the first normally open contact of the second power switch relay C14. The first moving contact of the first power switch relay C13 and the first moving contact of the second power switch relay C14 are respectively connected to the positive and negative output terminals of the power supply unit C1. The power supply unit C1 is configured in this way so that when performing positive voltage discharge calibration and negative voltage charging calibration, this utility model can select one of the first power supply C11 and the second power supply C12 to be connected according to the different needs of the battery charging and discharging equipment. When the first moving contact and the first normally closed contact of the first power switch relay C13 are connected, and the first moving contact and the first normally closed contact of the second power switch relay C14 are connected, the first power supply C11 is connected and the second power supply C12 is disconnected; when the first moving contact and the first normally open contact of the first power switch relay C13 are connected, and the first moving contact and the first normally open contact of the second power switch relay C14 are connected, the first power supply C11 is disconnected and the second power supply C12 is connected.

[0033] In an embodiment of this utility model, the first moving contact, the first normally open contact, and the first normally closed contact of the first power control relay C2 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the first power control relay C2; the first moving contact, the first normally open contact, and the first normally closed contact of the second power control relay C3 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the second power control relay C3; the first moving contact and the first normally open contact of the third power control relay C4 are respectively connected to the second moving contact and the second normally open contact of the third power control relay C4; the first moving contact, the first normally open contact of the first current range relay J1... The first normally closed contact and the first moving contact of the first current range relay J1 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the second current range relay J2. The first moving contact, the first normally open contact, and the first normally closed contact of the third current range relay J3 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the third current range relay J3. The first moving contact, the first normally open contact, and the first normally closed contact of the first access switching relay F1 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the first access switching relay F1. The second moving contact, the second normally open contact, and the second normally closed contact are respectively connected. The first moving contact, the first normally open contact, and the first normally closed contact of the second access switching relay G1 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the second access switching relay G1. The first moving contact, the first normally open contact, and the first normally closed contact of the third access switching relay H1 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the third access switching relay H1. The first moving contact, the first normally open contact, and the first normally closed contact of the first power switch relay C13 are respectively connected to the second moving contact, the second normally open contact, and the second normally closed contact of the first power switch relay C13. The first moving contact, first normally open contact, and first normally closed contact of the second power switch relay C14 are respectively connected to the second moving contact, second normally open contact, and second normally closed contact of the second power switch relay C14. This configuration effectively improves the current-carrying capacity of the first power control relay C2, second power control relay C3, third power control relay C4, first current range relay J1, second current range relay J2, third current range relay J3, first access switching relay F1, second access switching relay G1, third access switching relay H1, first power switch relay C13, and second power switch relay C14.

[0034] In an embodiment of this utility model, the resistor selection unit D includes a first resistor selection relay D1, a second resistor selection relay D2, a first resistor D3, a second resistor D4, and a third resistor D5. The first resistor selection relay D1 and the second resistor selection relay D2 are controlled by the control module 3. The resistance values ​​of the first resistor D3, the second resistor D4, and the third resistor D5 are all different; the resistance value of the first resistor D3 can be 5 ohms, the resistance value of the second resistor D4 can be 250 ohms, and the resistance value of the third resistor D5 can be 2 kilohms. The first moving contact of the first resistor selection relay D1 is connected to the first terminal of the resistor selection unit D, and the first normally open contact of the first resistor selection relay D1 is connected to the first moving contact of the second resistor selection relay D2. The first normally closed contact of a resistor selection relay D1 is connected to the first terminal of a first resistor D3. The second terminal of the first resistor D3 is connected to the second normally open contact of the first resistor selection relay D1. The second moving contact of the first resistor selection relay D1 is connected to the second terminal of the resistor selection unit D. The second normally closed contact of the first resistor selection relay D1 is connected to the second moving contact of the second resistor selection relay D2. The second normally open contact of the second resistor selection relay D2 is connected to the first terminal of the second resistor D4. The second terminal of the second resistor D4 is connected to the first normally open contact of the second resistor selection relay D2. The first normally closed contact of the second resistor selection relay D2 is connected to the first terminal of a third resistor D5. The second terminal of the third resistor D5 is connected to the second normally closed contact of the second selection relay. When the first moving contact and the first normally closed contact of the first resistor selection relay D1 are connected, the second moving contact and the second normally closed contact of the first resistor selection relay D1 are connected, the first moving contact and the first normally closed contact of the second resistor selection relay D2 are connected, and the second moving contact and the second normally closed contact of the second resistor selection relay D2 are connected, the third resistor D5 is connected, and the first resistor D3 and the second resistor D4 are disconnected; when the first moving contact and the first normally closed contact of the first resistor selection relay D1 are connected, the second moving contact and the second normally closed contact of the first resistor selection relay D1 are connected, the first moving contact and the first normally open contact of the second resistor selection relay D2 are connected, and the second moving contact and the second normally open contact of the second resistor selection relay D2 are connected, the second resistor D4 is connected, and the second resistor D4 and the third resistor D5 are disconnected.

[0035] In an embodiment of this utility model, the access switch unit E includes a first access switch relay E1 and a second access switch relay E2. The first moving contact of the first access switch relay E1 is connected to the HI terminal of the multimeter connection terminal B, the second moving contact of the first access switch relay E1 is connected to the LO terminal of the multimeter connection terminal B, the first normally open contact of the first access switch relay E1 is connected to the moving contact of the second access switch relay E2, the second normally closed contact of the second access switch relay E2 is connected to the V+ terminal of the channel access terminal A, the second normally open contact of the first access switch relay E1 is connected to the moving contact of the second access switch relay E2, and the second normally closed contact of the second access switch relay E2 is connected to the V- terminal of the channel access terminal A.

[0036] In an embodiment of this utility model, the calibration switching sampling module 1 further includes a power selection unit K and a grounding switch unit L. The power selection unit K is used to apply different voltages to the V+ terminal of the channel access terminal A, and the grounding switch unit L is used to control whether the V- terminal of the channel access terminal A is grounded. The V+ and V- terminals of the channel access terminal A are connected to the I+ and I- terminals of the channel access terminal A through a connection switch unit M. The connection switch unit M controls whether the V+ and I+ terminals of the channel access terminal A are connected, and the connection switch unit M controls whether the V- and I+ terminals of the channel access terminal A are connected. This utility model uses the power selection unit K, the grounding switch unit L, and the connection switch unit M to connect with the channel access terminal A, enabling the utility model to also perform voltage calibration on the auxiliary power supply and temperature sensor; specifically, in conjunction with... Figure 6 As shown, when this invention performs voltage calibration on the auxiliary power supply and temperature sensor (i.e., the calibration switching sampling module 1 of this invention is in voltage calibration mode), the connection switch unit M disconnects the V+ and I+ terminals of the channel access terminal A and disconnects the V- and I- terminals of the channel access terminal A. The power selection unit K connects different voltages to the V+ terminal of the channel access terminal A according to the device that needs to be calibrated. The grounding switch unit L controls the V- terminal of the channel access terminal A to be grounded. The access switch unit E is turned on so that the HI and LO terminals of the multimeter connection terminal B are connected to the V+ and V- terminals of the channel access terminal A, respectively, so that the digital multimeter connected to the multimeter connection terminal B can perform voltage measurement.

[0037] In an embodiment of this utility model, the connection switch unit M includes a connection switch relay M1. The first moving contact of the connection switch relay M1 is connected to the V+ terminal of the channel access terminal A, the first normally closed contact of the connection switch relay M1 is connected to the I+ terminal of the channel access terminal A, the second moving contact of the connection switch relay M1 is connected to the V- terminal of the channel access terminal A, and the second normally closed contact of the connection switch relay M1 is connected to the I- terminal of the channel access terminal A. When the first moving contact and the first normally closed contact of the connection switch relay M1 are connected, and the second moving contact and the second normally closed contact of the connection switch relay M1 are connected, the V+ terminal and the I+ terminal of the channel access terminal A are disconnected, and the V- terminal and the I- terminal of the channel access terminal A are disconnected.

[0038] In an embodiment of this utility model, the power selection unit K includes a first power selection relay K1, a second power selection relay K2, and a multi-voltage power supply K3 with multiple output voltages; the multi-voltage power supply can output 6mV, 24mV, 1V, and 4V output voltages; the first power selection relay K1 and the second power selection relay K2 are controlled by the control module 3; the moving contact of the first power selection relay K1 is connected to the first normally open contact of the connecting switch relay M1; the normally closed contact and normally open contact of the first power selection relay K1 are respectively connected to the first moving contact and the second moving contact of the second power selection relay K2; the first normally closed contact, the first normally open contact, the second normally closed contact, and the second normally open contact of the second power selection relay K2 are respectively connected to multiple output terminals of the multi-voltage power supply K3; this utility model allows different output voltages to be selected and output to the channel access terminal A through the first power selection relay K1 and the second power selection relay K2.

[0039] The grounding switch unit L includes a grounding switch relay L1. The second moving contact of the grounding switch relay L1 is connected to the second normally open contact of the connection switch relay M1, and the second normally closed contact of the grounding switch relay L1 is grounded. The moving contact of the first power selection relay K1 is connected to the first normally open contact of the connection switch relay M1 through the grounding switch relay L1. The first moving contact of the grounding switch relay L1 is connected to the first normally open contact of the connection switch relay M1, and the first normally closed contact of the grounding switch relay L1 is connected to the moving contact of the first power selection relay K1. When the first moving contact and the first normally closed contact of the grounding switch relay L1 are connected, and the second moving contact and the second normally closed contact of the grounding switch relay L1 are connected, the moving contact of the first power selection relay K1 is connected to the first normally open contact of the connection switch relay M1, and the V- terminal of the channel access terminal A is grounded.

[0040] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A calibration switching sampling module, characterized in that: It includes channel access terminals, multimeter connection terminals, power control unit, resistor selection unit, access switch unit, first access switching unit, second access switching unit and third access switching unit; The channel access terminal has a V+ terminal, a V- terminal, an I+ terminal, and an I- terminal. The V+ terminal and the I+ terminal of the channel access terminal are connected, and the V- terminal and the I- terminal of the channel access terminal are connected. The multimeter connection terminals have HI, LO and A1 terminals; the HI and LO terminals of the multimeter connection terminals are connected to the V+ and V- terminals of the channel access terminals respectively through the access switch unit. The access switch unit controls whether the HI terminal of the multimeter connection terminal is connected to the V+ terminal of the channel access terminal, and the access switch unit also controls whether the LO terminal of the multimeter connection terminal is connected to the V- terminal of the channel access terminal. The power control unit includes a power unit, a first power control relay, a second power control relay, and a third power control relay. The power unit can output positive and negative voltages. The first normally closed contact of the first power control relay and the first normally open contact of the second power control relay are connected to the positive output terminal of the power unit. The first normally open contact of the first power control relay and the first normally closed contact of the second power control relay are connected to the negative output terminal of the power unit. The first moving contact of the first power control relay is connected to the first normally open contact of the third power control relay. The first access switching unit includes a first access switching relay, the second access switching unit includes a second access switching relay, and the third access switching unit includes a third access switching relay. A resistor selection unit has multiple selectable resistors with different resistance values. The first terminal of the resistor selection unit is connected to the first normally closed contact of the first access switching relay, and the second terminal of the resistor selection unit is connected to the first normally closed contact of the second access switching relay. The first normally open contact of the first access switching relay is connected to the A1 terminal of a multimeter connection terminal, and the second normally closed contact of the second access switching relay is connected to the LO terminal of the multimeter connection terminal. The first moving contact of the first access switching relay is connected to the I+ terminal of the channel access terminal, and the first moving contact of the second access switching relay is connected to the first normally closed contact of the third access switching relay. The first normally closed contact of the third access switching relay is also connected to the first moving contact of a third power control relay, and the first normally open contact of the third access switching relay is connected to the first moving contact of the second power control relay. The first moving contact of the third access switching relay is connected to the V- terminal of the channel access terminal.

2. The calibration switching sampling module as described in claim 1, characterized in that: The multimeter connection terminal also has an A2 terminal. The first normally open contact of the first access switching relay and the first normally open contact of the second access switching relay are connected to the LO terminal, A1 terminal and A2 terminal of the multimeter connection terminal through the current range selection unit. The current range selection unit includes a first current range relay, a second current range relay, a third current range relay, and a shunt interface. The first moving contact of the first current range relay is connected to the first normally open contact of the first access switching relay, and the first normally closed contact of the first current range relay is connected to the first moving contact of the second current range relay. The first normally open contact and the first normally closed contact of the second current range relay are respectively connected to terminals A1 and A2 of the multimeter connection terminal. The first moving contact of the third current range relay is connected to the first normally open contact of the second access switching relay, and the first normally closed contact of the third current range relay is connected to the LO terminal of the multimeter connection terminal. The first end of the shunt interface is connected to the first normally open contact of the first current range relay, and the second end of the shunt interface is connected to the first normally open contact of the third current range relay.

3. The calibration switching sampling module as described in claim 1, characterized in that: The resistor selection unit includes a first resistor selection relay, a second resistor selection relay, a first resistor, a second resistor, and a third resistor, the resistance values ​​of the first resistor, the second resistor, and the third resistor are all different; The first moving contact of the first resistor selection relay is connected to the first terminal of the resistor selection unit. The first normally open contact of the first resistor selection relay is connected to the first moving contact of the second resistor selection relay. The first normally closed contact of the first resistor selection relay is connected to the first terminal of the first resistor. The second terminal of the first resistor is connected to the second normally open contact of the first resistor selection relay. The second moving contact of the first resistor selection relay is connected to the second terminal of the resistor selection unit. The second normally closed contact of the first resistor selection relay is connected to the second moving contact of the second resistor selection relay. The second normally open contact of the second resistor selection relay is connected to the first terminal of the second resistor. The second terminal of the second resistor is connected to the first normally open contact of the second resistor selection relay. The first normally closed contact of the second resistor selection relay is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the second normally closed contact of the second selection relay.

4. The calibration switching sampling module as described in claim 1, characterized in that: The power supply unit includes a first power supply, a second power supply, a first power switch relay, and a second power switch relay. The output currents of the first power supply and the second power supply are different. The positive and negative output terminals of the first power supply are respectively connected to the first normally closed contact of the first power switch relay and the first normally closed contact of the second power switch relay. The positive and negative output terminals of the second power supply are respectively connected to the first normally open contact of the first power switch relay and the first normally open contact of the second power switch relay. The first moving contact of the first power switch relay and the first moving contact of the second power switch relay are respectively connected to the positive and negative output terminals of the power supply unit.

5. The calibration switching sampling module as described in claim 1, characterized in that: The access switch unit includes a first access switch relay and a second access switch relay. The first moving contact of the first access switch relay is connected to the HI terminal of the multimeter connection terminal, the second moving contact of the first access switch relay is connected to the LO terminal of the multimeter connection terminal, the first normally open contact of the first access switch relay is connected to the moving contact of the second access switch relay, the second normally closed contact of the second access switch relay is connected to the V+ terminal of the channel access terminal, the second normally open contact of the first access switch relay is connected to the moving contact of the second access switch relay, and the second normally closed contact of the second access switch relay is connected to the V- terminal of the channel access terminal.

6. The calibration switching sampling module as described in claim 1, characterized in that: It also includes a power selection unit and a grounding switch unit; the power selection unit is used to apply different voltages to the V+ terminal of the channel access terminal, and the grounding switch unit is used to control whether the V- terminal of the channel access terminal is grounded. The V+ and V- terminals of the channel access terminal are connected to the I+ and I- terminals of the channel access terminal through a connection switch unit. The connection switch unit controls whether the V+ and I+ terminals of the channel access terminal are connected or not, and controls whether the V- and I+ terminals of the channel access terminal are connected or not.

7. The calibration switching sampling module as described in claim 6, characterized in that: The connection switch unit includes a connection switch relay, the first moving contact of the connection switch relay is connected to the V+ terminal of the channel access terminal, the first normally closed contact of the connection switch relay is connected to the I+ terminal of the channel access terminal, the second moving contact of the connection switch relay is connected to the V- terminal of the channel access terminal, and the second normally closed contact of the connection switch relay is connected to the I- terminal of the channel access terminal.

8. The calibration switching sampling module as described in claim 7, characterized in that: The power selection unit includes a first power selection relay, a second power selection relay, and a multi-voltage power supply with multiple output voltages. The moving contact of the first power selection relay is connected to the first normally open contact of the connecting switch relay. The normally closed contact and normally open contact of the first power selection relay are respectively connected to the first moving contact and the second moving contact of the second power selection relay. The first normally closed contact, the first normally open contact, the second normally closed contact, and the second normally open contact of the second power selection relay are respectively connected to multiple output terminals of the multi-voltage power supply.

9. The calibration switching sampling module as described in claim 8, characterized in that: The grounding switch unit includes a grounding switch relay, the second moving contact of the grounding switch relay is connected to the second normally open contact of the connection switch relay, and the second normally closed contact of the grounding switch relay is grounded; The moving contact of the first power selection relay is connected to the first normally open contact of the connection switch relay through the grounding switch relay. The first moving contact of the grounding switch relay is connected to the first normally open contact of the connection switch relay. The first normally closed contact of the grounding switch relay is connected to the moving contact of the first power selection relay.

10. A four-quadrant automatic calibrator, characterized in that: The four-quadrant automatic calibrator has the calibration switching sampling module as described in claim 1.

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