Battery detection power supply multi-channel parallel machine control structure

Abstract

The utility model discloses the technical field of battery detection, specifically say is battery detection power supply multichannel parallel machine control structure. It includes mid -range machine and a plurality of parallel machines, and a plurality of parallel machines are connected in proper order for the data transmission between parallel machines, and one parallel machine is connected with mid -range machine for the data transmission between parallel machine and mid -range machine. The output positive pole and output negative pole of parallel machine are connected with the positive pole and negative pole of battery respectively, and the characteristic is, and the parallel machine only connected with mid -range machine contains sampling circuit, and sampling circuit is connected with the main control board of corresponding parallel machine, and sampling circuit is used for delivering sampling signal to main control board. Sampling circuit is connected with the positive pole and negative pole of battery, and the connecting point of sampling circuit and the positive pole and negative pole of battery is located behind the connecting point of all parallel machine and the positive pole and negative pole of battery, and sampling circuit is used for gathering battery voltage and total current, and forms sampling signal. The cost of this control structure is lower.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, specifically a multi-channel parallel control structure for battery testing power supplies. Background Technology

[0002] Battery monitoring power supplies typically operate in constant current output mode. To increase the output current, multiple channels are often connected in parallel. Traditional parallel structures include... Figure 1 As shown, it connects the positive and negative output terminals of each parallel channel in parallel, and then connects them to the positive and negative terminals of the battery. The intermediate computer divides the set value into N equal parts (N is the number of parallel channels), and then sends it to each power channel. Each power channel is controlled by its own main control board and uploads the collected current value to the intermediate computer via CAN communication. The intermediate computer sums the uploaded current values ​​of each channel to calculate the total current after parallel operation, and then uploads it to the host computer. Since the channels are connected in parallel, the voltage of each channel is the same. The intermediate computer only needs to upload the voltage sample value of one channel to the host computer, generally the voltage value of the channel with the smallest channel number.

[0003] However, in traditional parallel configurations, each parallel circuit requires a sampling circuit. As a testing device, the multi-channel parallel control structure for battery detection power supplies demands high accuracy in voltage and current sampling. The sampling circuit needs to use high-precision Hall sensors, high-performance operational amplifiers, high-precision resistors, and high-precision AD converters. When multiple channels are paralleled, individual sampling circuits are required, leading to higher costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a multi-channel parallel control structure for battery detection power supply, which has a low cost.

[0005] To solve the above problems, the following technical solutions are provided:

[0006] This utility model discloses a multi-channel parallel control structure for battery testing power supplies, comprising a central control unit and multiple parallel units. These parallel units are sequentially connected and adapted for data transmission between them. One parallel unit is connected to the central control unit for data transmission between the parallel unit and the central control unit. The positive and negative output terminals of the parallel unit are connected to the positive and negative terminals of the battery, respectively. The key feature is that only the parallel unit connected to the central control unit contains a sampling circuit. This sampling circuit is connected to the main control board of the corresponding parallel unit and transmits the sampling signal to the main control board. The sampling circuit is connected to the positive and negative terminals of the battery, and the connection point between the sampling circuit and the positive and negative terminals is located after all the connection points between the parallel units and the positive and negative terminals of the battery. The sampling circuit is used to collect battery voltage and total current to form a sampling signal.

[0007] In this configuration, the positive output terminals of all the parallel units are connected in parallel to the positive terminal of the battery, and the negative output terminals of all the parallel units are connected in parallel to the negative terminal of the battery. The sampling circuit is adapted to be connected to the wire between the parallel connection point of the positive output terminal of the parallel unit and the positive terminal of the battery, and the sampling circuit is adapted to be connected to the wire between the parallel connection point of the negative output terminal of the parallel unit and the negative terminal of the battery, thereby realizing the acquisition of battery voltage and total current.

[0008] Multiple parallel units are arranged in sequence, and two connected parallel units are connected by a CAN line to realize data transmission between the parallel units.

[0009] The sampling circuit is located in the last parallel unit.

[0010] The parallel unit and the intermediate unit are connected via a CAN bus for data transmission between the parallel unit and the intermediate unit.

[0011] The intermediate computer is connected to the upper computer via a network cable to enable communication between the two.

[0012] The sampling circuit includes a current sampling unit, which contains a Hall sensor H and a current sampling chip U1. The Hall sensor H is fitted onto the positive terminal of the battery. One terminal of the Hall sensor H is connected to one end of resistor R1, and the other terminal of the Hall sensor H is connected to one end of resistor R2. The other end of resistor R1 is connected to the non-inverting input of operational amplifier U1. The other end of resistor R2 is connected to the inverting input of operational amplifier U1 and one end of resistor R4. The other end of resistor R4 is grounded. The output of operational amplifier U1 is connected to the current sampling chip U1 and one end of resistor R3. The other end of resistor R3 is connected to the non-inverting input of operational amplifier U1. The current sampling chip U1 is connected to the main control board.

[0013] The sampling circuit includes a voltage sampling unit and a current sampling unit, which includes an operational amplifier U3 and a voltage chip U4. The positive terminal of the battery is connected to one end of a resistor R5, and the negative terminal of the battery is connected to one end of a resistor R6. The other ends of resistors R5 and R6 are both connected to the non-inverting input of operational amplifier U3. The output of operational amplifier U3 is connected to the voltage chip U4 and one end of a resistor R7, respectively. The other end of resistor R7 is connected to the inverting input of operational amplifier U3. The voltage chip U4 is connected to the main control board.

[0014] The above approach has the following advantages:

[0015] In this utility model's multi-channel parallel control structure for battery detection power supplies, only the parallel unit connected to the master unit contains a sampling circuit. This sampling circuit is adapted and connected to the corresponding parallel unit's main control board. The sampling circuit transmits the sampling signal to the master control board. The connection points of the sampling circuit with the battery's positive and negative terminals are located after all the connection points of the parallel units with the battery's positive and negative terminals. The sampling circuit collects the battery voltage and total current to form a sampling signal. In use, the parallel unit containing the sampling circuit collects the battery voltage and current values ​​after all the connection points of the parallel units with the battery's positive and negative terminals and uploads them to the slave unit and master unit respectively. This current sampling value is the total current value after parallel connection, eliminating the need for summation by the master unit. Since multiple parallel units are connected in parallel with the battery, the voltage values ​​are equal, thus completing the acquisition of current and voltage. This multi-channel parallel control structure only solders the acquisition circuit on one parallel unit, leaving the other channels unsoldered, effectively reducing hardware costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a multi-channel parallel control structure for battery detection power supply in the background technology;

[0017] Figure 2 This is a schematic diagram of the multi-channel parallel control structure of the battery detection power supply of this utility model;

[0018] Figure 3 This is a flowchart of the multi-channel parallel control structure for battery testing power supply of this utility model;

[0019] Figure 4 This is a schematic diagram of the sampling circuit in the multi-channel parallel control structure of the battery detection power supply of this utility model;

[0020] Figure 5 This is a flowchart of the multi-channel parallel control structure for battery detection power supply of this utility model. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figure 2As shown, the multi-channel parallel control structure for battery testing power supply of this utility model includes a central control unit and multiple parallel units, namely parallel units CH1, CH2, ... and CHn. These parallel units are connected sequentially via CAN lines for data transmission between them. One parallel unit is connected to the central control unit via a CAN line for data transmission between the parallel units and the central control unit. The positive and negative output terminals of each parallel unit are connected to the positive and negative terminals of the battery, respectively. Only the parallel unit connected to the central control unit contains a sampling circuit, which is connected to the main control board of the corresponding parallel unit. The sampling circuit transmits the sampling signal to the main control board. The sampling circuit is connected to the positive and negative terminals of the battery, and the connection point between the sampling circuit and the positive and negative terminals of the battery is located after all the connection points between the parallel units and the positive and negative terminals of the battery. The sampling circuit is used to collect the battery voltage and total current to form a sampling signal.

[0023] In this embodiment, the positive output terminals of all parallel units are connected in parallel and then connected to the positive terminal of the battery. The negative output terminals of all parallel units are connected in parallel and then connected to the negative terminal of the battery. The sampling circuit is adapted to be connected to the wire between the parallel connection point of the positive output terminals of the parallel units and the positive terminal of the battery. The sampling circuit is adapted to be connected to the wire between the parallel connection point of the negative output terminals of the parallel units and the negative terminal of the battery, thereby realizing the acquisition of battery voltage and total current.

[0024] In this embodiment, the sampling circuit is located in the last parallel unit, namely parallel unit CHn, and this parallel unit is connected to the intermediate unit via the CAN line.

[0025] In this embodiment, the intermediate computer is connected to the upper computer via a network cable to enable communication between the two and achieve remote control.

[0026] In this embodiment, the main control board contains an MCU and peripheral circuits for driving its operation. The selection of the MCU model and the specific structure of the peripheral circuits can be made by those skilled in the art through conventional means and are existing technologies, so they will not be described in detail here.

[0027] like Figure 3 As shown, in this embodiment, the sampling circuit includes a current sampling unit, which contains a Hall sensor H and a current sampling chip U1. The Hall sensor H is fitted onto the positive terminal of the battery. One terminal of the Hall sensor H is connected to one end of resistor R1, and the other terminal is connected to one end of resistor R2. The other end of resistor R1 is connected to the non-inverting input of operational amplifier U1. The other end of resistor R2 is connected to the inverting input of operational amplifier U1 and one end of resistor R4, with the other end of resistor R4 grounded. The output of operational amplifier U1 is connected to pin 3 of current sampling chip U1 and one end of resistor R3, with the other end of resistor R3 connected to the non-inverting input of operational amplifier U1. Pins 6-9 of current sampling chip U1 are connected to the main control board. In this embodiment, the structure of current sampling chip U1 is as follows: Figure 3As shown, the specific model can be selected by those skilled in the art as needed. It is existing technology and will not be described in detail here. The connection method between the current sampling chip U1 and the MCU is also existing technology and will not be described in detail here.

[0028] like Figure 4 As shown, the sampling circuit includes a voltage sampling unit and a current sampling unit containing an operational amplifier U3 and a voltage chip U4. The positive terminal of the battery is connected to one end of resistor R5, and the negative terminal is connected to one end of resistor R6. The other ends of resistors R5 and R6 are both connected to the non-inverting input of operational amplifier U3. The output of operational amplifier U3 is connected to pin 3 of voltage chip U4 and one end of resistor R7, respectively. The other end of resistor R7 is connected to the inverting input of operational amplifier U3. Pins 6-9 of voltage chip U4 are connected to the main control board. In this embodiment, the structure of the current and voltage chip U4 is as follows: Figure 4 As shown, the specific model can be selected by those skilled in the art as needed. It is existing technology and will not be described in detail here. The connection method between the current and voltage chip U4 and the MCU is also existing technology and will not be described in detail here.

[0029] At work, such as Figure 5 As shown, the intermediate computer sets the parallel device with the sampling circuit as the master (e.g., Figure 2 The CHn component is responsible for voltage and current sampling. Next, the master computer determines the number of parallel channels based on the CAN information and distributes the setpoints evenly to each parallel channel. Then, the master channel collects the system's voltage and current values ​​and uploads them to the master computer and slave computer via the CAN bus. Afterward, each parallel channel calculates and adjusts its current output based on the current setpoint and the collected current value, thus achieving multi-channel parallel control.

[0030] This solution only solders the acquisition circuit (CHn in the figure) on the main channel control board, while other channels, acting as slaves, do not have acquisition circuits soldered on, effectively reducing hardware costs. Simultaneously, the host acquires the voltage and current values ​​at the battery root and uploads them to the intermediate and slave devices respectively. This current sample value is the total current value after parallel operation, eliminating the need for summation by the intermediate device and reducing computational complexity.

Claims

1. A multi-channel parallel control structure for a battery detection power supply, comprising a central control unit and multiple parallel units, wherein the multiple parallel units are sequentially adapted and connected for data transmission between the parallel units, and one parallel unit is adapted and connected to the central control unit for data transmission between the parallel unit and the central control unit; the positive and negative output terminals of the parallel unit are respectively connected to the positive and negative terminals of the battery; characterized in that, Only the parallel unit connected to the intermediate unit contains a sampling circuit. The sampling circuit is adapted and connected to the main control board of the corresponding parallel unit. The sampling circuit is used to transmit the sampling signal to the main control board. The sampling circuit is adapted and connected to the positive and negative terminals of the battery. The connection point of the sampling circuit to the positive and negative terminals of the battery is located behind the connection points of all the parallel units to the positive and negative terminals of the battery. The sampling circuit is used to collect the battery voltage and total current to form a sampling signal.

2. The multi-channel parallel control structure for battery detection power supply as described in claim 1, characterized in that, All the positive output terminals of the parallel units are connected in parallel and then connected to the positive terminal of the battery. All the negative output terminals of the parallel units are connected in parallel and then connected to the negative terminal of the battery. The sampling circuit is adapted to be connected to the wire between the parallel connection point of the positive output terminal of the parallel unit and the positive terminal of the battery. The sampling circuit is adapted to be connected to the wire between the parallel connection point of the negative output terminal of the parallel unit and the negative terminal of the battery, thereby realizing the acquisition of battery voltage and total current.

3. The multi-channel parallel control structure for battery detection power supply as described in claim 1, characterized in that, Multiple parallel units are arranged in sequence, and two connected parallel units are connected by a CAN line to realize data transmission between the parallel units.

4. The multi-channel parallel control structure for battery detection power supply as described in claim 3, characterized in that, The sampling circuit is located in the last parallel unit.

5. The multi-channel parallel control structure for battery detection power supply as described in claim 1, characterized in that, The parallel unit and the intermediate unit are connected via a CAN bus for data transmission between the parallel unit and the intermediate unit.

6. The multi-channel parallel control structure for battery detection power supply as described in claim 1, characterized in that, The intermediate computer is connected to the upper computer via a network cable to enable communication between the two.

7. The multi-channel parallel control structure for battery detection power supply as described in claim 1, characterized in that, The sampling circuit includes a current sampling unit, which contains a Hall sensor H and a current sampling chip U1. The Hall sensor H is fitted onto the positive terminal of the battery. One terminal of the Hall sensor H is connected to one end of resistor R1, and the other terminal of the Hall sensor H is connected to one end of resistor R2. The other end of resistor R1 is connected to the non-inverting input of operational amplifier U1. The other end of resistor R2 is connected to the inverting input of operational amplifier U1 and one end of resistor R4. The other end of resistor R4 is grounded. The output of operational amplifier U1 is connected to the current sampling chip U1 and one end of resistor R3. The other end of resistor R3 is connected to the non-inverting input of operational amplifier U1. The current sampling chip U1 is connected to the main control board.

8. The multi-channel parallel control structure for battery detection power supply as described in claim 1, characterized in that, The sampling circuit includes a voltage sampling unit and a current sampling unit, which includes an operational amplifier U3 and a voltage chip U4. The positive terminal of the battery is connected to one end of a resistor R5, and the negative terminal of the battery is connected to one end of a resistor R6. The other ends of resistors R5 and R6 are both connected to the non-inverting input of operational amplifier U3. The output of operational amplifier U3 is connected to the voltage chip U4 and one end of a resistor R7, respectively. The other end of resistor R7 is connected to the inverting input of operational amplifier U3. The voltage chip U4 is connected to the main control board.

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