Variable Delay Charge Control Circuit Test Optimization
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Solution Overview
Problem
Conventional charging and discharging control circuits with delay circuits require extended test times for over-charge and over-discharge detection, leading to increased manufacturing costs due to the lack of adjustable delay times and additional control terminals.
Innovation Solution
A voltage detector circuit is introduced between the power supply terminal and the voltage detection terminal, allowing the internal control circuit to enter a test mode that reduces delay time without adding control terminals, thereby shortening test times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a delay circuit is used to protect the lithium ion battery from over-charging, then the battery protection reliability is improved, but the test time required for the charging and discharging control circuit is extended
Solution Approach 1:
The patent applies the dynamics principle by making the delay time adjustable rather than fixed. The delay circuit includes a delay time setting register that allows the delay period to be dynamically changed based on operational mode. During normal battery protection operation, a longer delay time ensures reliable over-charging prevention. During test mode, a shorter delay time enables faster verification of circuit functionality, thus resolving the contradiction between reliability and test time.
Solution Approach 2:
The patent implements parameter changes by modifying the delay time parameter according to different operational states. The system changes the delay circuit's time constant parameter based on whether it is in normal operation or test mode. This is achieved through a delay time setting register that can be programmed with different values, allowing the same hardware circuit to exhibit different temporal characteristics for different purposes.
2Measurement precision
If the delay time is extended to ensure proper battery protection, then the detection precision is improved, but the manufacturing cost increases due to extended test requirements
Solution Approach 1:
The system dynamically adjusts the delay time parameter based on operational context. During actual battery protection operation, the extended delay time ensures accurate detection and prevents false triggering, maintaining high detection precision. During manufacturing testing, the delay time can be reduced to minimize test duration and associated costs, while still allowing comprehensive verification of circuit functionality.
Solution Approach 2:
The patent changes the delay time parameter to optimize both detection precision and manufacturing efficiency. By programmatically setting different delay values in the delay time setting register, the system achieves high detection precision during normal operation with extended delays, while reducing delays during testing to lower manufacturing costs.
3Adaptability or versatility
If a voltage detector circuit is added between the power supply terminal and voltage detection terminal, then the test mode functionality is improved, but the device complexity increases
Solution Approach 1:
The voltage detector circuit serves multiple functions: it detects voltage during normal battery protection operation and simultaneously enables test mode functionality. The same detection mechanism is used for both operational monitoring and self-testing purposes. The delay time setting register also serves dual purposes of controlling protection delay and test timing, reducing the need for separate dedicated test circuitry.
Solution Approach 2:
The system performs self-testing through the voltage detector circuit that monitors its own operational states. The test mode utilizes the existing voltage detection infrastructure to verify circuit functionality without requiring external test equipment or separate test circuits. The control circuit can autonomously initiate and complete test sequences, reducing overall system complexity.
Data Source
AI summary
A charging and discharging control circuit is provided in which a delay circuit is built in an over-discharge detector circuit, an over-charge detector circuit, or the like. A delay time of the detector circuit can be changed from an external without adding a control terminal, thereby reducing a test time of the detector circuit. A voltage detector circuit is disposed between a power supply terminal and a power supply voltage detection terminal of the charging and discharging control circuit, and the voltage detector circuit detects a specified voltage or higher, to thereby shorten the delay time of the internal control circuit.