High-Voltage Detection Circuit Eliminates Isolation Units
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Solution Overview
Problem
The internal circuit structure of vehicle batteries is excessively complicated, leading to increased costs and safety risks due to the need for complex and error-prone high-voltage detection circuits that require isolation units to connect low-voltage and high-voltage sections.
Innovation Solution
A high-voltage detection circuit with a controller, current detection sub-circuit, switch detection sub-circuit, and switch driving sub-circuit that integrates these components to directly control switches within the battery high-voltage loop, eliminating the need for isolation units and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an isolation unit is used to connect the low-voltage section to the high-voltage loop, then the safety and normal operation of both sections are ensured, but the circuit structure becomes complicated and the cost increases
Solution Approach 1:
The patent extracts the detection and control functions from the low-voltage section and relocates them directly into the high-voltage loop. The controller, current detection sub-circuit, switch detection sub-circuit, and switch driving sub-circuit are all integrated within the high-voltage loop, eliminating the need for an isolation unit while maintaining safety and functionality.
Solution Approach 2:
The patent merges the detection and control functions with the high-voltage loop operations. By integrating the controller and sub-circuits directly into the high-voltage loop, the system combines multiple functions into a unified structure, simplifying the overall circuit architecture and removing the need for separate isolation components.
2Ease of operation
If an isolation unit is used to connect the low-voltage section to the high-voltage loop, then the normal operation of both sections is ensured, but the cost increases
Solution Approach 1:
The patent removes the costly isolation unit from the system by extracting the control and detection functions and placing them directly within the high-voltage loop. This elimination of unnecessary components reduces manufacturing costs while preserving normal operational capabilities.
3Measurement precision
If the detection circuit is connected to the BMU of the low-voltage section, then the high-voltage loop parameters can be detected, but the internal circuit structure becomes excessively complicated
Solution Approach 1:
The patent merges the detection circuit functions directly into the high-voltage loop operations. The current detection sub-circuit and switch detection sub-circuit are integrated within the high-voltage loop, allowing parameter detection without requiring complex connections to the low-voltage BMU section.
Data Source
AI summary
The present invention provides a high-voltage detection circuit, detector, battery device and vehicle, the high-voltage detection circuit includes: a controller including a first signal input port, a second signal input port, and a signal output port; a current detection sub-circuit for sampling a current signal of internal side of a main negative switch and for transmitting the current signal to the first signal input port; a switch detection sub-circuit, a first end of the switch detection sub-circuit being configured to sample a first electric signal of external side of a to-be-detected switch, and a second end of the switch detection sub-circuit being configured to transmit the first electric signal to the second signal input port; and a switch driving sub-circuit, configured for sampling a switch control signal via the signal output port and generating a switch driving signal according to the switch control signal.