Output Switching Circuit Eliminating Triangular Wave Generator
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Solution Overview
Problem
Existing output switching circuits face challenges in scale reduction and high production yield due to the presence of a triangular wave generating circuit, which is prone to production spread and complicates integration with digital circuits.
Innovation Solution
An output switching circuit design that eliminates the triangular wave generating circuit by using a comparison unit and drive pulse generating unit to control transistors based on feedback and input signals, reducing analog circuitry and enabling high-frequency drive pulses to minimize harmonic components and increase yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-oscillating triangular wave generating circuit is used, then the output switching circuit can be implemented, but the oscillation frequency spreads due to production spread and yield decreases
Solution Approach 1:
The patent removes the self-oscillating triangular wave generating circuit from the output switching circuit. Instead, it uses an external triangular wave signal input terminal to accept triangular wave signals from external sources, thereby eliminating the source of frequency spread caused by production variations in internal oscillation circuits.
2Adaptability or versatility
If analog circuits are scaled down to combine with digital circuits, then integration is achieved, but the triangular wave generating circuit becomes more difficult to control and yield decreases
Solution Approach 1:
The patent extracts the triangular wave generating function from the integrated circuit by providing an external triangular wave signal input terminal. This allows the output switching circuit to be scaled down and integrated with digital circuits without the reliability issues associated with miniaturized internal oscillation circuits.
3Use of energy by moving object
If the output voltage is controlled by PWM switching, then efficient power control is achieved, but the circuit requires complex triangular wave generation and comparison
Solution Approach 1:
The patent removes the internal triangular wave generating circuit from the PWM control system. By accepting triangular wave signals from external sources through a dedicated input terminal, the circuit achieves efficient PWM power control with reduced internal complexity, requiring only comparison functionality rather than full oscillation generation.
Data Source
AI summary
An output switching circuit includes a switching circuit having a first transistor connected to a high-voltage power supply, a second transistor connected to a low-voltage power supply, and an output s terminal at a connection node between the first and second transistors; a comparison unit that compares an input signal with a feedback signal obtained by feedback of an output signal of the output terminal via a low-pass filter to generate a comparison signal; and a drive pulse generating unit that generates first drive pulses for driving the first transistor and second drive pulses for driving the second transistor in accordance with the comparison signal.