Two-Stage Wake-Up Circuit for Reliable Charge Controller Triggering
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Solution Overview
Problem
Conventional wake-up circuits for charge controllers in new energy vehicles fail to ensure effective waking due to incomplete discharge of capacitors, leading to poor applicability and inefficient power management.
Innovation Solution
A wake-up circuit comprising a first-stage and second-stage charging circuit with capacitors and diodes to manage charging and discharging based on input signals, ensuring a rising edge signal starts from 0 V regardless of signal changes, thereby maintaining capacitor partial charge states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage charging circuit with capacitor C1 is used to generate rising edge signals, then the circuit structure is simple, but the wake-up function fails when the CP signal changes from high level to PWM level because the capacitor cannot be completely discharged
Solution Approach 1:
The charging circuit is divided into two stages: a first charging circuit with capacitor C1 that handles initial charging, and a second charging circuit with capacitor C2 that ensures complete discharge and generates the rising edge. This segmentation allows each stage to perform its specific function optimally, resolving the contradiction between simple structure and reliable wake-up function.
Solution Approach 2:
Capacitor C2 acts as an intermediary between the first charging circuit and the output. It receives charge from C1 and ensures complete discharge to generate a clean rising edge signal, mediating the transition between different signal levels and ensuring reliable wake-up functionality.
2Stability of the object's composition
If the capacitor C1 is fully charged when the CP signal is at high level, then the output terminal is at high level, but the wake-up circuit cannot generate a rising edge signal when the CP signal changes from high level to low level due to incomplete discharge
Solution Approach 1:
The circuit dynamically adjusts the charging and discharging process through two stages. The first stage charges C1 to a stable state, while the second stage ensures complete discharge by charging C2, allowing the circuit to adapt to different signal transition scenarios and maintain versatility.
Solution Approach 2:
The first charging circuit performs preliminary charging of capacitor C1 when the CP signal is at high level. This preliminary action prepares the circuit for subsequent signal transitions, ensuring that when the CP signal changes to PWM level, the second charging circuit can properly discharge and generate the rising edge signal.
3Use of energy by moving object
If a conventional wake-up circuit is used, then the power consumption is reduced when the on-board charger is not working, but the applicability is poor because the charge controller may not be woken up effectively in all scenarios
Solution Approach 1:
The wake-up circuit is segmented into two charging circuits that operate in sequence. This segmentation ensures that the circuit can handle different signal scenarios effectively while maintaining low power consumption during idle periods, thereby improving both energy efficiency and scenario coverage.
Solution Approach 2:
The two-stage charging circuit design provides universal functionality by handling multiple signal transition scenarios (low to high, high to PWM) effectively. This multi-functionality ensures the charge controller can be woken up reliably in all scenarios while maintaining low power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures high applicability and effective waking of the charge controller, reducing power consumption and extending component life by managing capacitor states for consistent signal generation.
Implementation Method 1
a first capacitor C1, an input terminal of the first-stage charging circuit 101 is coupled to an input terminal of the wake-up circuit 10, and an output terminal of the first-stage charging circuit 101 is coupled to an input terminal of the second-stage charging circuit 102
Implementation Method 2
a second capacitor C2, an output terminal of the second-stage charging circuit 102 is coupled to an output terminal of the wake-up circuit and connected to the charge controller
Data Source
AI summary
A wake-up circuit for a charge controller is provided, which includes a first-stage charging circuit and a second-stage charging circuit. The first-stage charging circuit includes a first capacitor. When an input terminal of the first-stage charging circuit receives a high level signal and the first capacitor is in a partially charged state, the first-stage charging circuit charges the first capacitor and outputs a first charging voltage to the second-stage charging circuit. When the input terminal of the first-stage charging circuit receives a low level signal, the first-stage charging circuit discharges the first capacitor. The second-stage charging circuit includes a second capacitor. When the second-stage charging circuit receives the first charging voltage output by the first-stage charging circuit, the second-stage charging circuit charges the second capacitor and outputs a wake-up signal to the charge controller, thereby increasing a scenario coverage of the wake-up circuit to ensure high applicability.