High-Side Switch Gate Control With Current Limiting and Zener Clamping
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Solution Overview
Problem
Existing control circuits for high-side switches lack efficient mechanisms to regulate maximum current and power consumption, particularly in applications like battery management, battery cell balance, LED backlight drivers, and power converters.
Innovation Solution
A high-side switch control circuit comprising an on/off transistor, bias resistor, zener diode, level-shifting transistor, and current source or resistor, where the level-shifting transistors are controlled by control signals or voltages to limit maximum current and power consumption, with zener diodes clamping maximum voltages and resistors regulating current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If existing control circuits for high-side switches are used, then the basic switching function is achieved, but the maximum current and power consumption are not effectively regulated
Solution Approach 1:
The patent changes the electrical parameters of the control circuit by introducing a zener diode to clamp the gate-source voltage at a maximum value (VZ) and a current source to limit the maximum current (I_MAX) through the level-shifting transistor. This ensures that the on/off transistor operates within safe current and voltage limits while reducing power consumption.
Solution Approach 2:
The patent introduces a level-shifting transistor as an intermediary component between the control signal and the on/off transistor. This level-shifting transistor, controlled by a current source, mediates the turning on of the on/off transistor while limiting the maximum current. The zener diode acts as an intermediary to clamp the voltage and protect the transistor from overvoltage conditions.
2Reliability
If no voltage clamping mechanism is used, then the circuit is simpler, but the maximum voltage of the on/off transistor cannot be limited
Solution Approach 1:
The zener diode is used to change the voltage parameter by clamping the gate-source voltage of the on/off transistor at a maximum value (VZ). This prevents the voltage from exceeding safe limits and protects the transistor from breakdown, while adding only a single diode component to the circuit.
3Ease of operation
If the level-shifting transistor is used to turn on the on/off transistor, then the switching control is improved, but the maximum current is not limited
Solution Approach 1:
A current source is connected to the level-shifting transistor to change the current parameter by limiting the maximum current (I_MAX) that can flow through the level-shifting transistor. This ensures that the on/off transistor is turned on effectively while preventing excessive current consumption and protecting the circuit from overcurrent conditions.
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 solution effectively regulates maximum current and power consumption of level-shifting transistors, enhancing efficiency and reducing power consumption in high-side switch control circuits for various applications such as battery management and LED backlight drivers.
Implementation Method 1
The zener diode is coupled to clamp a maximum voltage of the on/off transistor
Data Source
AI summary
A high-side switch control circuit is provided. The high-side switch control circuit includes an on/off transistor, a bias resistor, a zener diode, a level-shifting transistor, and a current source. The on/off transistor operates as a switch. The bias resistor is coupled to turn off the on/off transistor. The zener diode is coupled to clamp the maximum voltage of the on/off transistor. The level-shifting transistor is coupled to turn on the on/off transistor. The current source is coupled to the level-shifting transistor. The current source limits the maximum current of the level-shifting transistor.