EV Drive Logic Circuit for Three-Path Torque Shutoff
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Solution Overview
Problem
The existing drive apparatus in electric vehicles fails to meet safety level requirements when using conventional vehicle regulation drive chips, as these chips lack the functional circuits necessary for the second and third turn-off paths, leading to potential out-of-control scenarios.
Innovation Solution
The drive apparatus incorporates a control chip, a watchdog chip, a drive logic circuit, and a plurality of drive chips, where each drive chip has three pins connected to the drive logic circuit, allowing for the generation and output of drive control signals and enable signals that enable the use of vehicle regulation drive chips to stop drive torque through three turn-off paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional vehicle regulation drive chips are used, then cost is reduced and ease of manufacture is improved, but safety level is worsened because the chips lack functional circuits for second and third turn-off paths
Solution Approach 1:
The patent introduces a drive logic circuit as an intermediary component between the control chip and the drive chips. This drive logic circuit receives control signals from the control chip and generates appropriate drive signals that enable three turn-off paths even when using conventional drive chips without built-in safety circuits. The drive logic circuit acts as a mediator that compensates for the lack of safety features in the conventional drive chips, thereby maintaining safety requirements while allowing the use of cost-effective conventional components.
2Reliability
If drive chips with high safety level are used, then safety level is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the safety-critical functions into a centralized drive logic circuit rather than distributing them across multiple drive chips. The drive logic circuit consolidates the functionality needed to create three turn-off paths, receiving inputs from the control chip and coordinating the control of multiple drive chips. This approach achieves the same safety level as using high-safety drive chips but with lower overall system complexity and cost.
3Reliability
If drive chips with high safety level are used, then safety level is improved, but cost is increased
Solution Approach 1:
The patent employs conventional drive chips that are cheaper and more readily available than high-safety drive chips. By using the drive logic circuit to compensate for the lack of built-in safety features in these conventional chips, the system achieves the required safety level while significantly reducing component costs. The approach trades the use of expensive specialized components for a combination of inexpensive standard components plus a coordinating control circuit.
Data Source
AI summary
A drive apparatus and an electric vehicle with a vehicle regulation drive chip are disclosed. The drive apparatus includes a control chip, a watchdog chip, a drive logic circuit, and a plurality of drive chips. The control chip is connected to the watchdog chip and the drive logic circuit, and is configured to determine a pulse width modulation PWM signal of each switch, output the PWM and a first signalto the drive logic circuit. The watchdog chip is connected to the drive logic circuit, and is configured to send a second signal. The first and the second pin of the drive chip are connected to the drive logic circuit, whenthe third pin is configured to connect to a corresponding switch, and adjust a drive signal of the connected switch based on the received drive control signal and the received enable signal that generated by the drive logic circuit.