High-voltage sampling system for new energy automobile charging
Through the series high-voltage sampling system, the digital isolation module and the transformer isolation module are used for communication, which simplifies the sampling architecture of the charging system of the new energy vehicle, solves the problem of resource occupation and isolation risks in traditional systems, and achieves more efficient electrical isolation and power supply stability.
Patent Information
- Application Number
- CN202411266345.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2024-12-27
AI Technical Summary
Traditional dual high-voltage sampling systems occupy a large amount of hardware resources in charging new energy vehicles, increasing costs and complexity, and posing a risk of high and low voltage isolation.
It adopts a series-connected high-voltage sampling system to communicate through digital isolation modules and transformer isolation modules, simplifying the architecture, reducing the use of isolation devices, and improving electrical isolation capabilities.
The sampling system framework is optimized, the resource utilization of low-voltage modules is improved, the use of high-low voltage isolation devices is reduced, and the stability of high-voltage power supply output is enhanced.
Smart Images
Figure CN119199242A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of high-voltage sampling systems, and in particular to a high-voltage sampling system for charging new energy vehicles. Background Art
[0002] The current new energy needs to support dual-gun fast charging, which requires two independent high-voltage sampling systems for switching and matching. The traditional dual high-voltage sampling system is a parallel test circuit connected to the MCU, which requires a large amount of hardware resources, such as two-way SPI communication and two-way digital isolation, etc., which increases the cost and occupies a large amount of PCB space, increasing the difficulty of hardware development; at the same time, the power supply module used in the traditional dual high-voltage sampling system requires two independent DCDC conversions, which increases the use of isolation devices, resulting in increased risks of high and low voltage isolation, complex hardware architecture, and increased costs. Summary of the invention
[0003] In order to overcome the above shortcomings, the purpose of this application is to provide a high-voltage sampling system for charging new energy vehicles, thereby effectively solving the above problems.
[0004] In order to achieve the above objectives, the present application adopts the following technical solution: a high-voltage sampling system for charging new energy vehicles, the high-voltage sampling system is used to collect the voltage and current of the first charging channel and the second charging channel of the new energy vehicle, including:
[0005] A control module, a first sampling module, a second sampling module and a power supply module, wherein:
[0006] The control module and the first sampling module perform isolated communication through a digital isolation module, and the first sampling module is used to collect the voltage and current of the first charging channel and send the collected voltage and current to the control module through the digital isolation module.
[0007] The second sampling module and the first sampling module perform isolated communication through the transformer isolation module. The second sampling module is used to collect the voltage and current of the second charging channel and send the collected voltage and current to the first sampling module through the transformer isolation module. The first sampling module sends the collected voltage and current of the second charging channel to the control module through the digital isolation module.
[0008] The power supply module is used to supply power to the first sampling module and the second sampling module.
[0009] Further, the control module includes a control chip, the first sampling module includes a first sampling chip, and the digital isolation module includes a digital isolation chip, wherein:
[0010] The control chip is electrically connected to the digital isolation chip, and the digital isolation chip is electrically connected to the first sampling chip.
[0011] Furthermore, the second sampling module includes a second sampling chip, the transformer isolation module includes an isolation transformer, the first sampling chip is electrically connected to the isolation transformer, and the isolation transformer is electrically connected to the second sampling chip.
[0012] Furthermore, the power supply module includes a power supply driver chip, a first channel isolation transformer, a second channel isolation transformer, a first channel voltage output unit and a second channel voltage output unit, wherein:
[0013] The power supply driving chip is electrically connected to the first channel isolation transformer, the first channel isolation transformer is electrically connected to the first channel voltage output unit, and the first channel voltage output unit is electrically connected to the first sampling chip to supply power to the first sampling chip.
[0014] The power supply driving chip is electrically connected to the second channel isolation transformer, the second channel isolation transformer is electrically connected to the second channel voltage output unit, and the second channel voltage output unit is electrically connected to the second sampling chip to supply power to the second sampling chip.
[0015] Further, the first channel voltage output unit includes a first rectifier bridge circuit, a first inductor and a first voltage stabilizing chip, the first channel isolation transformer is electrically connected to the first rectifier bridge circuit, the first rectifier bridge circuit is electrically connected to the first inductor, the first inductor is electrically connected to the first voltage stabilizing chip, and the output port of the first voltage stabilizing chip is electrically connected to the first sampling chip to supply power to the first sampling chip.
[0016] Furthermore, the first rectifier bridge circuit includes a first rectifier circuit composed of a first transistor and a second transistor connected in series, a second rectifier circuit composed of a third transistor and a fourth transistor connected in series, and a first capacitor. The first rectifier circuit, the second rectifier circuit and the first capacitor are connected in parallel, the first end of the first channel isolation transformer is connected between the first transistor and the second transistor, and the second end of the first channel isolation transformer is connected between the third transistor and the fourth transistor.
[0017] Furthermore, the second channel voltage output unit includes a second rectifier bridge circuit, a second inductor and a second voltage stabilizing chip, the second channel isolation transformer is electrically connected to the second rectifier bridge circuit, the second rectifier bridge circuit is electrically connected to the second inductor, the second inductor is electrically connected to the second voltage stabilizing chip, and the output port of the second voltage stabilizing chip is electrically connected to the second sampling chip to supply power to the second sampling chip.
[0018] Furthermore, the second rectifier bridge circuit includes a third rectifier circuit composed of a fifth transistor and a sixth transistor connected in series, a fourth rectifier circuit composed of a seventh transistor and an eighth transistor connected in series, and a second capacitor. The third rectifier circuit, the fourth rectifier circuit and the second capacitor are connected in parallel, the first end of the second channel isolation transformer is connected between the fifth transistor and the sixth transistor, and the second end of the first channel isolation transformer is connected between the seventh transistor and the eighth transistor.
[0019] Furthermore, the first sampling chip and the second sampling chip include a voltage acquisition port and a current acquisition port respectively, wherein:
[0020] The voltage acquisition port is connected to a voltage acquisition circuit, and the voltage acquisition circuit includes a first resistor, a second resistor, and a third resistor. The first end of the first resistor is electrically connected to the voltage acquisition part of the new energy vehicle charging system, the second end of the first resistor is electrically connected to the first end of the second resistor, the second end of the second resistor is electrically connected to the voltage acquisition port, the first end of the third resistor is electrically connected between the first resistor and the second resistor, and the second end of the third resistor is grounded;
[0021] The current collection port is connected to a current collection circuit, which includes a fourth resistor, a first end of the fourth resistor is electrically connected to the current collection port, and a second end of the fourth resistor is electrically connected to a current collection part of a new energy vehicle charging system.
[0022] Furthermore, the voltage calculation formula collected by the voltage collection port is:
[0023]
[0024] In the formula, V1 is the voltage value collected by the voltage collection port, VO is the voltage value of the voltage collection part of the new energy vehicle charging system, R1 is the resistance value of the first resistor, and R3 is the resistance value of the third resistor;
[0025] The current calculation formula collected by the current collection port is:
[0026]
[0027] Wherein, i1 is the current value collected by the current collection port, and R4 is the resistance value of the fourth resistor.
[0028] Beneficial Effects
[0029] The present application provides a high-voltage sampling system for charging new energy vehicles, which adopts a series-type dual high-voltage sampling system to sample the dual-gun fast charging system of the new energy vehicle, optimizes the sampling system framework, simplifies the dual high-voltage sampling system architecture, improves the utilization of resources of the low-voltage module, reduces the use of high and low voltage isolation devices, and improves the ability of high and low voltage electrical isolation. At the same time, it optimizes the power supply module of the dual high-voltage system and improves the output stability of the high-voltage power supply. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the content of the present application.
[0031] Figure 1 System block diagram of the high voltage sampling system for this application.
[0032] Figure 2 This is a circuit diagram of a high voltage sampling system in one embodiment of the present application.
[0033] Figure 3 This is a sampling circuit diagram in an embodiment of the present application.
[0034] Figure 4 This is a power supply circuit diagram in one embodiment of the present application. DETAILED DESCRIPTION
[0035] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.
[0036] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this article, "electrical connection" includes the situation where the constituent elements are connected together through an element with some electrical function. "Elements with some electrical function" are not particularly limited as long as they can transfer electrical signals between the connected constituent elements. "Elements with some electrical function" can be, for example, electrodes or wiring, or switching elements such as transistors, or other functional elements such as resistors, inductors or capacitors. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.
[0037] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.
[0038] As described in the background technology, the current new energy needs to support dual-gun fast charging, which requires two independent high-voltage sampling systems for switching and matching. The traditional dual high-voltage sampling system is connected to the MCU in parallel test circuit, which requires a large amount of hardware resources, such as two SPI communications and two digital isolations.
[0039] In view of the above content, the inventor provides a high-voltage sampling system for charging new energy vehicles, such as Figure 1As shown, the high-voltage sampling system is used to collect the voltage and current of the first charging channel and the second charging channel of the new energy vehicle, including a control module, a first sampling module, a second sampling module and a power supply module, wherein the control module and the first sampling module perform isolated communication through a digital isolation module, the first sampling module is used to collect the voltage and current of the first charging channel and send the collected voltage and current to the control module through the digital isolation module, the second sampling module and the first sampling module perform isolated communication through a transformer isolation module, the second sampling module is used to collect the voltage and current of the second charging channel and send the collected voltage and current to the first sampling module through the transformer isolation module, the first sampling module sends the collected voltage and current of the second charging channel to the control module through the digital isolation module, and the power supply module is used to supply power to the first sampling module and the second sampling module.
[0040] The present application provides a high-voltage sampling system for charging new energy vehicles, which adopts a series-type dual high-voltage sampling system to sample the dual-gun fast charging system of the new energy vehicle, optimizes the sampling system framework, simplifies the dual high-voltage sampling system architecture, improves the utilization of low-voltage module resources, reduces the use of high and low voltage isolation devices, and improves the ability of high and low voltage electrical isolation.
[0041] Next, combine Figure 2-4 The present application is described exemplarily.
[0042] An embodiment of the present application provides a high-voltage sampling system for charging new energy vehicles, such as Figure 2 As shown, the high voltage sampling system includes:
[0043] The control module includes a control chip U1. The control chip U1 is a low-voltage measurement MCU chip that provides SPI communication to parse and upload high-voltage sampling data to the main controller.
[0044] The digital isolation module includes a digital isolation chip U2. The digital isolation chip U2 can communicate between the high-voltage SPI and the low-voltage SPI by digital isolation.
[0045] The first sampling module includes a first sampling chip U3. The function of the first sampling chip U3 is to collect the current and voltage of one of the fast charging channels of the new energy charging system, receive and analyze the data of the AFE sampling module, and send the sampled data to the control chip U1 through the SPI communication method.
[0046] The second sampling module includes a second sampling chip U4. The function of the second sampling chip U4 is the same as that of the first sampling chip U3, which is used to collect the current and voltage of another fast charging channel of the new energy charging system. The first sampling chip U3 communicates with the second sampling chip U4 through the isolation transformer T1, and the communication mode is daisy chain communication.
[0047] The power supply module includes a power supply driver chip U5, an isolation transformer T2, an isolation transformer T3, a first channel voltage output unit P1, and a second channel voltage output unit P2. The power supply driver chip U5 is electrically connected to the first channel voltage output unit P1 through the isolation transformer T2, and the power supply driver chip U5 is electrically connected to the second channel voltage output unit P2 through the isolation transformer T3.
[0048] In some embodiments, the first channel voltage output unit P1 includes a first rectifier bridge circuit, a first inductor L1 and a first voltage stabilizing chip U61, the isolation transformer T2 is electrically connected to the first rectifier bridge circuit, the first rectifier bridge circuit is electrically connected to the first inductor (two inductors L1 and L2), the first inductor is electrically connected to the first voltage stabilizing chip U61, the output port of the first voltage stabilizing chip U61 is electrically connected to the first sampling chip U3 to power the first sampling chip U3, the first rectifier bridge circuit includes a first rectifier circuit composed of a first transistor D1 and a second transistor D2 connected in series, a second rectifier circuit composed of a third transistor D3 and a fourth transistor D4 connected in series, and a first capacitor C1, D1, D2, D3, and D4 are all diodes, the first rectifier circuit, the second rectifier circuit and the first capacitor C1 are connected in parallel, the first end of the isolation transformer T2 is connected between the first transistor D1 and the second transistor D2, and the second end of the isolation transformer T2 is connected between the third transistor D3 and the fourth transistor D4.
[0049] In some embodiments, the first channel voltage output unit P2 includes a second rectifier bridge circuit, a second inductor L2 and a second voltage stabilizing chip U62, the isolation transformer T3 is electrically connected to the second rectifier bridge circuit, the second rectifier bridge circuit is electrically connected to the second inductor (two inductors L3 and L4), the second inductor is electrically connected to the second voltage stabilizing chip U62, the output port of the second voltage stabilizing chip U62 is electrically connected to the second sampling chip U4 to power the second sampling chip U4, the second rectifier bridge circuit includes a third rectifier circuit composed of a fifth transistor D5 and a sixth transistor D6 connected in series, a fourth rectifier circuit composed of a seventh transistor D7 and an eighth transistor D8 connected in series, and a second capacitor C2, D5, D6, D7, and D8 are all diodes, the third rectifier circuit, the fourth rectifier circuit and the second capacitor C2 are connected in parallel, the first end of the isolation transformer T3 is connected between the fifth transistor D5 and the sixth transistor D6, and the second end of the isolation transformer T3 is connected between the seventh transistor D7 and the eighth transistor D8.
[0050] The control chip U1 is electrically connected to the digital isolation chip U2, the digital isolation chip U2 is electrically connected to the first sampling chip U3, the first sampling chip U3 is electrically connected to the isolation transformer T1, and the isolation transformer T1 is electrically connected to the second sampling chip U4.
[0051] The first sampling chip U3 and the second sampling chip U4 respectively include a voltage acquisition port and a current acquisition port, wherein the voltage acquisition port is connected to a voltage acquisition circuit, the voltage acquisition circuit includes a first resistor R1, a second resistor R2 and a third resistor R3, a first end of the first resistor R1 is electrically connected to a voltage acquisition part of a new energy vehicle charging system, a second end of the first resistor R1 is electrically connected to a first end of the second resistor R2, a second end of the second resistor R2 is electrically connected to the voltage acquisition port, a first end of the third resistor R3 is electrically connected between the first resistor R1 and the second resistor R2, and a second end of the third resistor R3 is grounded;
[0052] The voltage calculation formula collected by the voltage acquisition port is:
[0053]
[0054] Wherein, V1 is the voltage value collected by the voltage collection port, VO is the voltage value of the voltage collection part of the new energy vehicle charging system, R1 is the resistance value of the first resistor, and R3 is the resistance value of the third resistor.
[0055] like Figure 2 and Figure 3 As shown, the voltage acquisition circuit has multiple channels.
[0056] The current collection port is connected to the current collection circuit, which includes a fourth resistor R4, a first end of the fourth resistor R4 is electrically connected to the current collection port, and a second end of the fourth resistor is electrically connected to the current collection part of the new energy vehicle charging system.
[0057] like Figure 2 and Figure 3 As shown, the current collection circuit has multiple channels.
[0058] The current calculation formula collected by the current acquisition port is:
[0059]
[0060] Wherein, i1 is the current value collected by the current collection port, and R4 is the resistance value of the fourth resistor.
[0061] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.
Claims
1. A high-voltage sampling system for charging a new energy vehicle, the high-voltage sampling system is used to collect the voltage and current of the first charging channel and the second charging channel of the new energy vehicle, characterized in that: include: A control module, a first sampling module, a second sampling module and a power supply module, wherein: The control module and the first sampling module perform isolated communication through a digital isolation module, and the first sampling module is used to collect the voltage and current of the first charging channel and send the collected voltage and current to the control module through the digital isolation module. The second sampling module and the first sampling module perform isolated communication through the transformer isolation module. The second sampling module is used to collect the voltage and current of the second charging channel and send the collected voltage and current to the first sampling module through the transformer isolation module. The first sampling module sends the collected voltage and current of the second charging channel to the control module through the digital isolation module. The power supply module is used to supply power to the first sampling module and the second sampling module.
2. The high-voltage sampling system for charging new energy vehicles according to claim 1, characterized in that: The control module includes a control chip, the first sampling module includes a first sampling chip, and the digital isolation module includes a digital isolation chip, wherein: The control chip is electrically connected to the digital isolation chip, and the digital isolation chip is electrically connected to the first sampling chip.
3. The high-voltage sampling system for charging new energy vehicles as claimed in claim 2, characterized in that: The second sampling module includes a second sampling chip, the transformer isolation module includes an isolation transformer, the first sampling chip is electrically connected to the isolation transformer, and the isolation transformer is electrically connected to the second sampling chip.
4. The high-voltage sampling system for charging new energy vehicles as claimed in claim 3, characterized in that: The power supply module includes a power supply driving chip, a first channel isolation transformer, a second channel isolation transformer, a first channel voltage output unit and a second channel voltage output unit, wherein: The power supply driving chip is electrically connected to the first channel isolation transformer, the first channel isolation transformer is electrically connected to the first channel voltage output unit, and the first channel voltage output unit is electrically connected to the first sampling chip to supply power to the first sampling chip. The power supply driving chip is electrically connected to the second channel isolation transformer, the second channel isolation transformer is electrically connected to the second channel voltage output unit, and the second channel voltage output unit is electrically connected to the second sampling chip to supply power to the second sampling chip.
5. The high-voltage sampling system for charging new energy vehicles as claimed in claim 4, characterized in that: The first channel voltage output unit includes a first rectifier bridge circuit, a first inductor and a first voltage stabilizing chip. The first channel isolation transformer is electrically connected to the first rectifier bridge circuit, the first rectifier bridge circuit is electrically connected to the first inductor, the first inductor is electrically connected to the first voltage stabilizing chip, and the output port of the first voltage stabilizing chip is electrically connected to the first sampling chip to supply power to the first sampling chip.
6. The high-voltage sampling system for charging new energy vehicles as claimed in claim 5, characterized in that: The first rectifier bridge circuit includes a first rectifier circuit composed of a first transistor and a second transistor connected in series, a second rectifier circuit composed of a third transistor and a fourth transistor connected in series, and a first capacitor. The first rectifier circuit, the second rectifier circuit and the first capacitor are connected in parallel, the first end of the first channel isolation transformer is connected between the first transistor and the second transistor, and the second end of the first channel isolation transformer is connected between the third transistor and the fourth transistor.
7. The high-voltage sampling system for charging new energy vehicles as claimed in claim 4, characterized in that: The second channel voltage output unit includes a second rectifier bridge circuit, a second inductor and a second voltage stabilizing chip. The second channel isolation transformer is electrically connected to the second rectifier bridge circuit, the second rectifier bridge circuit is electrically connected to the second inductor, the second inductor is electrically connected to the second voltage stabilizing chip, and the output port of the second voltage stabilizing chip is electrically connected to the second sampling chip to supply power to the second sampling chip.
8. The high-voltage sampling system for charging new energy vehicles as claimed in claim 7, characterized in that: The second rectifier bridge circuit includes a third rectifier circuit composed of a fifth transistor and a sixth transistor connected in series, a fourth rectifier circuit composed of a seventh transistor and an eighth transistor connected in series, and a second capacitor. The third rectifier circuit, the fourth rectifier circuit and the second capacitor are connected in parallel. The first end of the second channel isolation transformer is connected between the fifth transistor and the sixth transistor, and the second end of the first channel isolation transformer is connected between the seventh transistor and the eighth transistor.
9. The high-voltage sampling system for charging new energy vehicles as claimed in claim 3, characterized in that: The first sampling chip and the second sampling chip include a voltage acquisition port and a current acquisition port respectively, wherein: The voltage acquisition port is connected to a voltage acquisition circuit, and the voltage acquisition circuit includes a first resistor, a second resistor, and a third resistor. The first end of the first resistor is electrically connected to the voltage acquisition part of the new energy vehicle charging system, the second end of the first resistor is electrically connected to the first end of the second resistor, the second end of the second resistor is electrically connected to the voltage acquisition port, the first end of the third resistor is electrically connected between the first resistor and the second resistor, and the second end of the third resistor is grounded; The current collection port is connected to a current collection circuit, which includes a fourth resistor, a first end of the fourth resistor is electrically connected to the current collection port, and a second end of the fourth resistor is electrically connected to a current collection part of a new energy vehicle charging system.
10. The high-voltage sampling system for charging new energy vehicles according to claim 9, characterized in that: The voltage calculation formula collected by the voltage collection port is: In the formula, V1 is the voltage value collected by the voltage collection port, VO is the voltage value of the voltage collection part of the new energy vehicle charging system, R1 is the resistance value of the first resistor, and R3 is the resistance value of the third resistor; The current calculation formula collected by the current collection port is: Wherein, i1 is the current value collected by the current collection port, and R4 is the resistance value of the fourth resistor.