Charging Tube Gate Pull-Down Circuit for Fast Low-Power Switch-Off
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Solution Overview
Problem
Existing battery management systems face a dilemma where ensuring fast switch-off of charging tubes to ensure safety during abnormal events like overcurrent, overvoltage, or overheating is hindered by high power consumption due to the need for large input capacitance, which is exacerbated by resistor values that are either too small for quick discharge or too large for efficient power use.
Innovation Solution
A fast switch-off circuit for charging tubes in battery management systems that includes a control circuit, pull-down discharge circuit, and discharge detection circuit, where a resistor with a resistance value greater than a preset value is used in conjunction with a pull-down discharge circuit to quickly discharge the charging tube by pulling the gate voltage to ground potential, rather than relying solely on the resistor for discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a smaller resistance value is chosen for the resistor R1 to ensure fast discharge of the input capacitor, then the switch-off speed of the charging tube is improved, but the power consumption during normal operation or standby increases
Solution Approach 1:
The discharge function is segmented into two modes: normal discharge through resistor R1 during standby, and fast discharge through the pull-down discharge circuit during abnormal events. This segmentation allows the system to use high resistance for power saving during normal operation while having a dedicated low-resistance path available when fast discharge is needed.
Solution Approach 2:
The pull-down discharge circuit is pre-configured and can be activated immediately when an abnormal event is detected. The control circuit is prepared to switch on the pull-down discharge circuit synchronously with the switch-off of the charging tube, ensuring that the fast discharge path is ready before the discharge is actually needed.
2Use of energy by moving object
If a larger resistance value is chosen for the resistor R1 to reduce power consumption, then the power consumption during normal operation or standby is reduced, but the discharge current decreases and the switch-off speed becomes slow
Solution Approach 1:
The discharge function is segmented into two modes: normal discharge through resistor R1 during standby, and fast discharge through the pull-down discharge circuit during abnormal events. This segmentation allows the system to use high resistance for power saving during normal operation while having a dedicated low-resistance path available when fast discharge is needed.
Solution Approach 2:
The pull-down discharge circuit acts as an intermediary component that provides a low-resistance discharge path when needed. This intermediary circuit allows the system to maintain high resistance in the normal path for power saving while having a separate fast discharge path that can be activated when rapid switch-off is required.
3Use of energy by moving object
If the resistance value of resistor R1 is increased to minimize power consumption, then power consumption is reduced, but the input capacitor discharges for too long making it difficult to quickly switch off the charging tube during abnormal events
Solution Approach 1:
The discharge function is segmented into two modes: normal discharge through resistor R1 during standby, and fast discharge through the pull-down discharge circuit during abnormal events. This segmentation allows the system to use high resistance for power saving during normal operation while having a dedicated low-resistance path available when fast discharge is needed.
Solution Approach 2:
The pull-down discharge circuit is pre-configured and can be activated immediately when an abnormal event is detected. The control circuit is prepared to switch on the pull-down discharge circuit synchronously with the switch-off of the charging tube, ensuring that the fast discharge path is ready before the discharge is actually needed.
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
This approach allows for rapid switching-off of charging tubes while minimizing power consumption, addressing the safety concerns associated with slow discharge times and high power consumption.
Implementation Method 1
the pull-down discharge circuit is configured to pull down a gate voltage of the charging tube to a ground potential for discharging
Implementation Method 2
discharges an input capacitor of the charging tube (an equivalent capacitor between the gate and the source of the charging tube) through a resistor R1
Data Source
AI summary
Disclosed is a fast switch-off circuit for a charging tube of a battery management system, which includes a control circuit, a pull-down discharge circuit, and a discharge detection circuit. The control circuit synchronously switches on the pull-down discharge circuit when switching off the charging tube; and switches off the pull-down discharge circuit when detecting a trigger signal. The pull-down discharge circuit pulls down a gate voltage of the charging tube to a ground potential so as to discharge fast, when being switched on. The discharge detection circuit generates and transmits the trigger signal to the control circuit, when the gate voltage of the charging tube drops to a low-level threshold or a pull-down time of the charging tube reaches a time threshold, after the pull-down discharge circuit is switched on. The fast switch-off circuit ensures fast switch-off for a charging tube of a battery management system, while minimizing power consumption.