Pyro-Switch Shunt Resistor Protection Diode
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Solution Overview
Problem
When a shunt resistor is cut by a pyro-switch in high-voltage applications, such as electric vehicles, the stored energy in the wiring and battery components can cause high voltage, leading to destruction and burnout of the battery and peripheral devices.
Innovation Solution
A protection system is introduced that includes a shunt resistor, a pyro-switch for cutting the resistor based on a predetermined signal, and a suppression unit, specifically a diode, connected between the resistor and the load unit, which suppresses the energy generated by the cutting action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shunt resistor is cut by the pyro-switch to disconnect the battery wiring, then the safety against short circuit and overcurrent is improved, but the stored energy in the wiring and battery components generates high voltage causing sparks and destruction
Solution Approach 1:
A diode is introduced as an intermediary component between the shunt resistor and the load unit. The diode provides a controlled path for the stored energy to dissipate safely after the shunt resistor is cut, preventing harmful high voltage and sparks while maintaining the safety function of the pyro-switch
2Ease of operation
If the base material of the shunt resistor is cut by the pyro-switch, then the circuit disconnection function is achieved, but the inductance energy of the wiring and battery components causes high voltage leading to burnout
Solution Approach 1:
The diode is pre-installed in the circuit to provide a protective path for energy dissipation. When the shunt resistor is cut, the stored energy is immediately directed through the diode, cushioning the impact and preventing high voltage damage to the battery and peripheral devices
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
The suppression unit effectively reduces the high voltage on the load unit, preventing damage to the battery and peripheral devices by allowing the energy to be safely dissipated, thus protecting the system from destruction and burnout.
Implementation Method 1
the suppression unit (2) is composed of a diode (20), and the diode (20) has a cathode side (20a) connected between the shunt resistor (100) and the load unit (for example, the motor M), and the diode (20) has an anode side (20b) connected to the load unit (for example, the motor M)
Implementation Method 2
a cutting unit 203 for cutting the base material 102 of the shunt resistor 100 by the exploded powder 202
Data Source
Figure 1
Figure 2~2(b)
Figure 3
AI summary
The purpose of the present invention is to provide a protection system capable of suppressing, using a pyro-switch, energy generated when cutting battery wiring. The protection system has: a shunt resistor 100 for measuring the value of current flowing from a battery B to a motor M; a pyro-switch 200 for cutting a shunt resistor 100 on the basis of a predetermined signal; and a suppression unit 2 connected between the shunt resistor 100 and the motor M. The suppression unit 2 suppresses the energy generated by cutting the shunt resistor 100 by the pyro-switch 200.