Gate-Voltage Precharge Control Circuit for Faster CXPI Switching
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Solution Overview
Problem
The increase in speed of control circuits for CXPI communications has led to longer fall and rise delay times when switching between dominant and recessive outputs due to the use of constant current and capacitance, necessitating a reduction in delay times.
Innovation Solution
A control circuit configuration with capacitive and discharge circuits, and delay improvement circuits using interlocking switches and transistors to set gate voltages near the threshold, reducing the delay times during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If constant current drive is employed for slew rate control, then communication speed is improved, but delay time during switching between dominant and recessive outputs increases
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitive element connected to the gate electrode before the actual switching operation. The charge circuit charges the capacitive element in advance when the output should transition to dominant state, and the discharge circuit discharges it in advance when transition to recessive state is needed. This preliminary preparation of gate voltage reduces the delay time during switching while maintaining the constant current drive for slew rate control during high-speed communication.
2Stability of the object's composition
If capacitance is used for slew rate control, then signal stability is improved, but transition delay time increases
Solution Approach 1:
The patent applies dynamics by making the charging and discharging currents dynamic rather than static. The charge circuit and discharge circuit adjust their current levels based on the switching requirements, providing higher current during transition periods to overcome the capacitance-induced delay, and maintaining appropriate current levels during stable states to preserve signal stability. This dynamic current adjustment allows the capacitive element to charge/discharge faster during transitions while maintaining signal integrity.
3Reliability
If gate voltage is set far from threshold for reliable switching, then switching reliability is improved, but delay time increases
Solution Approach 1:
The patent applies periodic action through the oscillating charging and discharging cycles of the capacitive element. The charge circuit periodically charges the gate voltage towards the threshold, and the discharge circuit periodically discharges it, creating a rhythmic switching pattern. This periodic charge-discharge action ensures that the gate voltage reaches the threshold reliably at the right moments while minimizing the time spent in transition states, thus reducing delay time while maintaining switching reliability.
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 proposed configuration effectively shortens the delay times during transitions by optimizing gate voltage changes, enhancing the circuit's responsiveness.
Implementation Method 1
a capacitive element connected between an output terminal of an output-switching transistor circuit and a control electrode
Data Source
AI summary
According to one embodiment, a control circuit includes a capacitive element connected between an output terminal of an output-switching transistor circuit and a control electrode, and a charge circuit charges the capacitive element when the ON/OFF switching signal is switched from an OFF command to an ON command, delay improvement circuit shortens a delay time from OFF to ON of the transistor circuit by setting the ON/OFF control voltage of the transistor circuit to the first switching threshold in conjunction with the operation of the charge circuit.