Power supply calibration tool and calibration system

Abstract

The utility model discloses a power supply calibration tool and a calibration system, the power supply calibration tool is applied to a charging and discharging device with a plurality of channels, each channel is used for accessing a corresponding electronic load, the power supply calibration tool comprises a main control circuit, a channel switching trimming circuit and a plurality of switching circuits, the main control circuit is connected with the channel switching trimming circuit, and the channel switching trimming circuit is connected with the plurality of switching circuits. And the channel switching trimming circuit is respectively connected with electronic loads arranged in the corresponding channels through a plurality of switching circuits. In the calibration process, the main control circuit is used for sending a control signal to the channel switching and trimming circuit and sequentially switching the corresponding switching circuits, so that the channel switching and trimming circuit sequentially detects and calibrates the current value and the voltage value of the electronic load in each channel during charging and discharging, and then multi-channel current and voltage calibration can be carried out. The calibration efficiency is improved, and the actual voltage value and the actual current value of the electronic load are equal to the set voltage value and the set current value respectively, or the difference value is within the preset error range.

Description

Technical Field

[0001] The utility model relates to the technical field of battery charging and discharging, in particular to a power calibration tooling and a calibration system. Background Art

[0002] During the production process of batteries, battery charging and discharging equipment is required to charge and discharge the batteries to achieve the formation and grading of the batteries, so as to complete the initialization of the batteries and activate the active substances of the battery cells. Before entering production, it is necessary to ensure that all performance indicators of the battery charging and discharging equipment meet the requirements, including the current accuracy and voltage accuracy of the battery charging and discharging equipment.

[0003] By regularly calibrating the current accuracy and voltage accuracy of the battery charging and discharging equipment, the charging and discharging equipment can stably output during operation, ensuring the accuracy and stability of parameters and reducing the failure rate. At present, the common detection method is to detect and correct each channel of the battery charging and discharging equipment one by one through a shunt. Its non-integrated calibration requires manual operation and has low calibration efficiency. Summary of the Utility Model

[0004] In view of the deficiencies of the above-mentioned prior art, the present application provides a power calibration tooling that can perform multi-channel current and voltage calibration to improve the calibration efficiency.

[0005] The following technical solutions are adopted in this embodiment:

[0006] A power calibration tooling is applied to a charging and discharging equipment with multiple channels, and each channel is used to connect to a corresponding electronic load. The power calibration tooling includes a main control circuit, a channel switching and trimming circuit, and multiple switching circuits. The main control circuit is connected to the channel switching and trimming circuit, and the channel switching and trimming circuit is respectively connected to the electronic loads arranged in the corresponding channels through multiple switching circuits;

[0007] The main control circuit is used to send control signals to the channel switching and trimming circuit and sequentially switch the corresponding switching circuits, so that the channel switching and trimming circuit sequentially detects and calibrates the current values and voltage values when the electronic loads in each channel charge and discharge.

[0008] Further, in the power calibration tooling, the channel switching and trimming circuit includes a register, a comparator, and an output circuit. The register is respectively connected to the input end of the comparator, the main control circuit, and the electronic load, and the output end of the comparator is connected to the main control circuit through the output circuit.

[0009] Further, in the power supply calibration tooling, the output circuit includes a first optocoupler and a second optocoupler. The input ends of the first optocoupler and the second optocoupler are connected in parallel to the first output end of the comparator, and the output ends of the first optocoupler and the second optocoupler are both connected to the main control circuit.

[0010] Further, in the power supply calibration tooling, a Hall sensor is further included. The Hall sensor is connected in series to the connection line between the electronic load and the channel switching and trimming circuit.

[0011] Further, in the power supply calibration tooling, the channel switching and trimming circuit further includes a multimeter, and the multimeter is connected to the Hall sensor.

[0012] Further, in the power supply calibration tooling, the output circuit further includes a third optocoupler and a fourth optocoupler. The input ends of the third optocoupler and the fourth optocoupler are connected in parallel to the second output end of the comparator, and the output ends of the third optocoupler and the fourth optocoupler are both connected to the main control circuit.

[0013] Further, in the power supply calibration tooling, the channel switching and trimming circuit further includes connection terminals, and the connection terminals are respectively connected to the register and the comparator.

[0014] A power supply calibration system includes a charge and discharge device, a host computer, and the above-mentioned power supply calibration tooling. The charge and discharge device includes a plurality of channels and a charge and discharge control circuit. Each channel is used to connect to a corresponding electronic load, and the charge and discharge control circuit is used to charge and discharge each electronic load. The host computer is respectively communicatively connected to the charge and discharge control circuit and the power supply calibration tooling.

[0015] Further, in the power supply calibration system, both the host computer and the charge and discharge control circuit include network communication modules, and the host computer is wirelessly connected to the charge and discharge control circuit through the network communication module.

[0016] Further, in the power supply calibration system, both the charge and discharge control circuit and the main control circuit include CAN high-speed communication modules, and the charge and discharge control circuit is wired-connected to the main control circuit through the CAN high-speed communication module.

[0017] Compared with the prior art, a power calibration tooling provided by the present application is applied to a charge and discharge device with multiple channels. Each channel is used to connect to a corresponding electronic load. During the calibration process, the main control circuit is used to send a control signal to the channel switching and trimming circuit, and sequentially switch the corresponding switch circuits, so that the channel switching and trimming circuit can sequentially detect and calibrate the current value and voltage value when the electronic load in each channel charges and discharges. Furthermore, multi-channel current and voltage calibration can be performed, improving the calibration efficiency, and making the actual voltage value and actual current value of the electronic load equal to the set voltage value and set current value respectively, or the difference is within a preset error range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a block diagram of the power calibration tooling and power calibration system provided by the present application.

[0019] Figure 2 It is a circuit schematic diagram of a specific embodiment of a register in the power calibration tooling provided by the present application.

[0020] Figure 3 It is a circuit schematic diagram of a specific embodiment of a comparator in the power calibration tooling provided by the present application.

[0021] Figure 4 It is a circuit schematic diagram of a specific embodiment of an output circuit in the power calibration tooling provided by the present application Figure 1 .

[0022] Figure 5 It is a circuit schematic diagram of a specific embodiment of an output circuit in the power calibration tooling provided by the present application Figure 2 .

[0023] Wherein, 10 is the main control circuit; 20 is the channel switching and trimming circuit; 30 is the switch circuit; 100 is the electronic load; 200 is the host computer; 300 is the charge and discharge control circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0025] The terms used in the embodiment part of the present application are only used to explain the specific embodiments of the present application, rather than aiming to limit the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0026] Hereinafter, some terms in the embodiments of the present application will be explained to facilitate the understanding of those skilled in the art.

[0027] (1) The terms "first", "second", etc. in the embodiments of this application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0028] (2) The "multiple" in the embodiments of this application refers to two or more, and other quantifiers are similar.

[0029] (3) The "and / or" in the embodiments of this application describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural.

[0030] (4) The "connection" in the embodiments of this application can be understood as electrical connection or communication connection. The electrical connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, when A is connected to B, it can also be that A is directly connected to C, C is directly connected to B, and the connection between A and B is realized through C. The communication connection of two connected electrical components is a wireless connection between the two electrical components, that is, an electromagnetic connection between the two electrical components.

[0031] Next, the application scenarios of the technical solutions in the embodiments of this application will be introduced in combination with the accompanying drawings in the embodiments of this application. The solutions provided by the embodiments of this application can be applied to various charge and discharge devices with multiple channels, such as the formation and grading equipment of lithium batteries. Each channel is used to connect to a corresponding electronic load, and the voltage calibration tooling can perform multi-channel current and voltage calibration to improve the calibration efficiency.

[0032] Please refer to Figure 1 , the power supply calibration tooling provided by this application includes a main control circuit 10, a channel switching and trimming circuit 20, and multiple switching circuits 30. The main control circuit 10 is connected to the channel switching and trimming circuit 20, and the channel switching and trimming circuit 20 is respectively connected to the electronic load 100 provided in the corresponding channel through multiple switching circuits 30.

[0033] During the calibration process, the main control circuit 10 is used to send control signals to the channel switching and trimming circuit 20, and sequentially switch the corresponding switching circuits 30, so that the channel switching and trimming circuit 20 sequentially detects and calibrates the current value and voltage value when the electronic load 100 in each channel is charged and discharged.

[0034] The channel switching trimming circuit 20 can sample the voltage value and current value of the electronic load 100 set in each channel. By comparing with the set voltage value and set current value, the comparison result is fed back to the host computer 200 through the main control circuit 10. The host computer 200 adjusts the charging and discharging voltage and charging and discharging current of the charging and discharging device for the electronic load 100, so that the actual voltage value and actual current value of the electronic load 100 are respectively equal to the set voltage value and set current value, or the difference is within the preset error range.

[0035] For example, when the channel switching trimming circuit 20 confirms that the sampled actual voltage value is smaller than the set voltage value, the result can be sent to the host computer 200 through the main control circuit 10, increasing the voltage when the charging and discharging device charges and discharges in the current channel, and continuing to compare the new actual voltage value with the set voltage value, finally making the actual voltage value equal to the set voltage value, or making the difference between the actual voltage value and the set voltage value within the preset error range.

[0036] Similarly, when the channel switching trimming circuit 20 confirms that the sampled actual voltage value is larger than the set voltage value, the result can be sent to the host computer 200 through the main control circuit 10, decreasing the voltage when the charging and discharging device charges and discharges in the current channel, and continuing to compare the new actual voltage value with the set voltage value, finally making the actual voltage value equal to the set voltage value, or making the difference between the actual voltage value and the set voltage value within the preset error range.

[0037] During the calibration process, after the calibration of the current value and voltage value of the electronic load 100 during charging and discharging in the current channel is completed, the main control circuit 10 can control the switch circuit 30 corresponding to the current channel to close, and make the switch circuit 30 corresponding to the next channel open. The channel switching trimming circuit 20 calibrates the current value and voltage value of the electronic load 100 during charging and discharging in the next channel, and then automatically completes the calibration of all channels, which can effectively improve the calibration efficiency.

[0038] Of course, the channel switching trimming circuit 20 can also repeatedly verify a certain channel, and the operator can flexibly select the verification method according to actual needs.

[0039] The main control circuit 10 includes a control chip and corresponding peripheral circuits, which are used to control each switch circuit 30 and the channel switching trimming circuit 20, and communicate with the host computer 200 to implement operations such as data interaction and service logic function control.

[0040] Please refer to Figure 2 and Figure 3, in some embodiments, the channel switching trimming circuit 20 includes a register U1, a comparator U2, and an output circuit. The register U1 is respectively connected to the input end of the comparator U2, the main control circuit 10, and the electronic load 100. The output end of the comparator U2 is connected to the main control circuit 10 through the output circuit.

[0041] The comparator U2 communicates with the register U1 to output a comparison result. Specifically, please refer to Figure 2 , the register U1 includes a clock pin CLK and 8 parallel output pins, and has a wide operating voltage range and low-power CMOS technology; by inputting a pulse signal to the clock pin, the serial input data bits can be shifted one by one to the parallel output pins.

[0042] The clock signal is used to control the data comparison operation to output the result of each bit comparison; the output pin EQ of the comparator U2 outputs the equal and unequal results, and then the results are sent to the main control circuit through the output circuit, so that the main control circuit can select whether to start calibration according to the results.

[0043] Specifically, the channel switching trimming circuit 20 further includes a switching device, such as a MOS transistor, which can be turned on or off according to the signal sent by the output circuit, thereby turning on or off the calibration of the current channel.

[0044] To achieve the required functions, the model of the register U1 can be selected as SN74HC164DR, which is a serial input and parallel output shift register U1. It can convert the serially input data into parallel output, input one bit each time, and after being controlled by the clock signal, output 8-bit parallel data. This device has characteristics such as high-speed operation, low power consumption, and input compatibility with TTL logic levels, and is suitable for applications that require high-speed parallel data output.

[0045] The model of the comparator U2 can be selected as SN74HC688PWR. Of course, other models can also be selected, but the register U1 and comparator U2 that can achieve the corresponding functions are not limited in this application.

[0046] Please refer to Figure 4 , in some embodiments, the output circuit includes a first optocoupler U3 and a second optocoupler U4. The input ends of the first optocoupler U3 and the second optocoupler U4 are connected in parallel to the first output end of the comparator U2, and the output ends of the first optocoupler U3 and the second optocoupler U4 are both connected to the calibration circuit.

[0047] The first optocoupler U3 and the second optocoupler U4 play a role in signal transmission and electrical isolation control, so as to use optical signals to transmit input signals to the output end, reduce signal transmission interference, and then accurately control the on-off state of the MOS transistor at the back end to confirm whether calibration is required.

[0048] The channel switching trimming circuit 20 may further include a Hall sensor, and the Hall sensor is connected in series to the connection line between the electronic load 100 and the channel switching trimming circuit 20 to obtain a high-precision actual current value.

[0049] Please refer to Figure 5 , in some embodiments, the output circuit further includes a third optocoupler U5 and a fourth optocoupler U6. The input terminals of the third optocoupler U5 and the fourth optocoupler U6 are connected in parallel to the second output terminal of the comparator U2, and the output terminals of the third optocoupler U5 and the fourth optocoupler U6 are both connected to the calibration circuit.

[0050] The third optocoupler U5 and the fourth optocoupler U6, and the first optocoupler U3 and the second optocoupler U4 are two sets of calibration methods respectively. For example, in the first set of calibration methods, the register U1 and the comparator U2 obtain the actual current value through the Hall sensor, and then the comparator U2 outputs the comparison result from its first output terminal through the first optocoupler U3 and the second optocoupler U4 to control the calibration circuit to achieve calibration; in the second set of calibration methods, the register U1 and the comparator U2 obtain the actual current value through the current sampling resistor, and then the comparator U2 outputs the comparison result from its second output terminal through the third optocoupler U5 and the fourth optocoupler U6 to control the calibration circuit to achieve calibration.

[0051] During the calibration process, the appropriate calibration method can be selected according to actual needs.

[0052] In some embodiments, the channel switching trimming circuit 20 further includes a multimeter, and the multimeter is connected to the Hall sensor to display the measured actual current value.

[0053] Moreover, the channel switching trimming circuit 20 may further include a voltage sampling board. The voltage acquisition line of the voltage sampling board is connected to the positive and negative poles of the electronic load 100, and the voltage sampling board is connected to the multimeter to display the actual voltage value of the electronic load 100 through the multimeter.

[0054] Connection terminals are provided in the channel switching trimming circuit 20, and the connection terminals are respectively connected to the register U1 and the comparator U2. The function of the connection terminals is to connect the register U1 and the comparator U2 to the main control circuit 10, facilitating communication between the register U1 and the comparator U2 and the main control circuit 10.

[0055] Please refer to Figure 1 , this application also provides a power calibration system, including a charge and discharge device, a host computer 200, and a power calibration tooling. The charge and discharge device includes multiple channels and a charge and discharge control circuit 300. Each channel is used to connect to a corresponding electronic load 100, and the charge and discharge control circuit 300 is used to charge and discharge each electronic load 100. The host computer 200 is respectively communicatively connected to the charge and discharge control circuit 300 and the power calibration tooling.

[0056] In some embodiments, both the host computer 200 and the charge and discharge control circuit 300 include network communication modules, and the host computer 200 is wirelessly connected to the charge and discharge control circuit 300 through the network communication module.

[0057] Both the charge and discharge control circuit and the main control circuit 10 include CAN high-speed communication modules, and the charge and discharge control circuit is wired to the main control circuit 10 through the CAN high-speed communication module.

[0058] Specifically, charge and discharge control software is provided in the host computer 200, and the host computer 200 is communicatively connected to the charge and discharge control circuit 300. The power calibration tooling exchanges data within the group and exchanges data with the system using the CAN communication protocol to achieve control and data acquisition functions.

[0059] The channel switching and trimming circuit 20 is connected to the main control circuit 10 to achieve the function of switching channel calibration, so as to realize multi-channel simultaneous calibration and record the calibrated data values in real time for viewing.

[0060] In summary, the present application adopts a modular power calibration system, which is mainly applied to battery charging and discharging equipment, can more stably calibrate the accuracy of current and voltage, and can better detect whether the measured item is abnormal.

[0061] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solution and the application concept of the present application, and all such changes or substitutions should fall within the protection scope of the appended claims of the present application.

Claims

1. A power calibration tooling, which is applied to a charge and discharge device with multiple channels, and each channel is used to access a corresponding electronic load, characterized in that The power supply calibration tooling includes a main control circuit, a channel switching and trimming circuit, and a plurality of switching circuits. The main control circuit is connected to the channel switching and trimming circuit, and the channel switching and trimming circuit is respectively connected to electronic loads arranged in corresponding channels through the plurality of switching circuits. The main control circuit is configured to send control signals to the channel switching and trimming circuit and sequentially switch the corresponding switching circuits, so that the channel switching and trimming circuit sequentially detects and calibrates the current value and voltage value when the electronic loads in each channel charge and discharge.

2. The power supply calibration tooling according to claim 1, wherein, The channel switching and trimming circuit includes a register, a comparator, an output circuit, and a calibration circuit. The register is respectively connected to the input end of the comparator, the main control circuit, and the electronic load, and the output end of the comparator is connected to the calibration circuit through the output circuit.

3. The power supply calibration tooling according to claim 2, wherein The output circuit includes a first optocoupler and a second optocoupler. The input ends of the first optocoupler and the second optocoupler are connected in parallel to the first output end of the comparator, and the output ends of the first optocoupler and the second optocoupler are both connected to the calibration circuit.

4. The power calibration tooling according to claim 1, wherein It further includes a Hall sensor, and the Hall sensor is connected in series to the connection line between the electronic load and the channel switching and trimming circuit.

5. The power supply calibration tooling according to claim 4, characterized in that The channel switching and trimming circuit further includes a multimeter, and the multimeter is connected to the Hall sensor.

6. The power calibration tooling according to claim 3, wherein The output circuit includes a third optocoupler and a fourth optocoupler. The input ends of the third optocoupler and the fourth optocoupler are connected in parallel to the second output end of the comparator, and the output ends of the third optocoupler and the fourth optocoupler are both connected to the calibration circuit.

7. The power supply calibration tooling according to claim 2, wherein The channel switching and trimming circuit further includes connection terminals, and the connection terminals are respectively connected to the register and the comparator.

8. A power calibration system, characterized in that, It includes a charge and discharge device, a host computer, and the power supply calibration tooling according to any one of claims 1-7. The charge and discharge device includes a plurality of channels and a charge and discharge control circuit. Each channel is used to connect to a corresponding electronic load, and the charge and discharge control circuit is used to charge and discharge each electronic load. The host computer is respectively communicatively connected to the charge and discharge control circuit and the power supply calibration tooling.

9. The power calibration system according to claim 8, wherein Both the host computer and the charge and discharge control circuit include network communication modules, and the host computer is wirelessly connected to the charge and discharge control circuit through the network communication module.

10. The power calibration system according to claim 8, wherein Both the charge and discharge control circuit and the main control circuit include CAN high-speed communication modules, and the charge and discharge control circuit is wired-connected to the main control circuit through the CAN high-speed communication module.

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