Dead Time Control Circuit Temperature Compensation
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Solution Overview
Problem
Existing dead time control circuits for push-pull type output buffers fail to accurately adjust dead time due to environmental factors like temperature and power supply voltage fluctuations, leading to increased manufacturing costs and potential large penetration currents.
Innovation Solution
A dead time control circuit with a delay circuit connected to an input terminal, a logic circuit with inputs via the delay circuit and directly to the input terminal, and a reference voltage generating circuit to adjust the delay time based on temperature characteristics, reducing the size and cost while maintaining accurate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external resistor and capacitor are added to adjust delay time, then delay time can be adjusted, but device size and manufacturing cost increase
Solution Approach 1:
The patent extracts the delay time adjustment function from external components (resistor and capacitor) and implements it within the integrated circuit using internal transistor-based delay circuits. This eliminates the need for external passive components while maintaining the adjustability of delay time through internal control mechanisms.
Solution Approach 2:
The patent merges the delay circuit, dead time control function, and temperature compensation mechanisms into a single integrated circuit block. By combining multiple functions that were previously implemented separately (delay generation, dead time control, temperature compensation) into one unified structure, the patent reduces overall device size and eliminates external components.
2Adaptability or versatility
If external resistor and capacitor are added to adjust delay time, then delay time can be adjusted, but manufacturing cost increases
Solution Approach 1:
The patent removes external passive components (resistor and capacitor) from the required component list and implements their functionality using standard semiconductor fabrication processes. This integration reduces assembly steps, eliminates external component procurement costs, and simplifies manufacturing while maintaining delay time adjustability through internal controls.
Solution Approach 2:
The integrated circuit performs self-adjustment of delay time through internal temperature compensation mechanisms and control circuits that automatically adapt to environmental conditions. This self-service capability eliminates the need for external adjustment components and reduces manufacturing complexity while maintaining accurate dead time control across varying temperatures.
3Device complexity
If delay time is fixed without temperature compensation, then device complexity is reduced, but dead time control accuracy deteriorates under temperature variations
Solution Approach 1:
The patent implements temperature sensing and compensation feedback mechanisms within the integrated circuit. Temperature sensors detect environmental temperature changes, and the control circuit automatically adjusts the delay time parameters to compensate for temperature-induced variations. This feedback system maintains accurate dead time control without requiring complex external adjustment mechanisms.
Solution Approach 2:
The patent dynamically changes internal circuit parameters (such as transistor gate voltages or current levels) based on detected temperature conditions. By adjusting these parameters in response to temperature variations, the circuit maintains stable delay time characteristics and accurate dead time control across different operating temperatures while keeping the overall device structure relatively simple.
Data Source
AI summary
In a dead time control circuit, a delay circuit is connected to an input terminal and adapted to delay signals therethrough by a delay time corresponding to a dead time. A logic circuit has a first input connected via the delay circuit to the input terminal, a second input connected directly to the input terminal, and an output connected to an output terminal. The dead time having adjustable temperature characteristics.