Waveform Shaping Circuit Without Diodes for Stable Pulse Voltage
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Solution Overview
Problem
The existing waveform shaping circuits, which use diodes, face issues due to temperature-dependent forward voltage fluctuations, affecting the target constant voltage setting and reliability.
Innovation Solution
A waveform shaping circuit design that excludes diodes, utilizing a capacitor, a first impedance element, and a switch circuit controlled by a switch control circuit to maintain a target constant voltage, ensuring the peak-to-peak voltage of the output pulse signal is equivalent to the input pulse signal, with the low or high voltage period set at a temperature-independent target constant voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diode is used in the waveform shaping circuit, then the circuit can set the voltage during the high voltage period at a constant voltage level, but the target constant voltage fluctuates according to temperature due to diode forward voltage characteristics
Solution Approach 1:
The patent removes the diode from the waveform shaping circuit, extracting the temperature-dependent component that causes voltage fluctuations. The circuit replaces the diode-based voltage setting with a capacitor and switch circuit controlled by a control pulse signal, eliminating the forward voltage characteristic that varies with temperature.
Solution Approach 2:
The patent changes the operating parameters by using a capacitor voltage that can be precisely controlled to a target constant voltage level, replacing the diode's fixed forward voltage drop. The switch circuit enables dynamic control of the capacitor voltage to maintain stability across temperature variations.
2Manufacturing precision
If a diode is used to shape the waveform, then the peak-to-peak voltage can be maintained, but the target constant voltage setting becomes inaccurate due to forward voltage fluctuations
Solution Approach 1:
The patent implements a control mechanism where a control pulse signal generated based on the input pulse signal controls the switch timing. This feedback-based control ensures the capacitor is charged to the precise target constant voltage level, improving voltage setting accuracy while maintaining stability.
3Device complexity
If a diode-based waveform shaping circuit is used, then the circuit structure is simple, but noise malfunctions occur due to temperature-induced voltage fluctuations
Solution Approach 1:
The patent introduces a capacitor as an intermediary energy storage element between the input pulse signal and the output, controlled by a switch and control pulse signal. This intermediary mechanism provides stable voltage levels that are less susceptible to noise and temperature effects, reducing malfunction risks.
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
This configuration ensures reliable waveform shaping without temperature fluctuations, reducing noise malfunctions and allowing for accurate signal generation and reading in CAN communication systems.
Implementation Method 1
a capacitor (42c) with one end connected to an input (42a) to which an input pulse signal is inputted and the other end connected to an output (42b)
Implementation Method 2
a first impedance element (42d) that has one end, which is connected to the other end of the capacitor (42c), and the other end, to which a target constant voltage is applied
Data Source
AI summary
A waveform shaping circuit includes a capacitor, an impedance element, a switch circuit, and a switch control circuit. Opposite ends of the capacitor are connected to the input and output, respectively. One end of the impedance element supplies a target constant voltage to the output end of the capacitor. The switch circuit has a switch without a diode. When on, the switch applies the target constant voltage to the output. When off, it does not. The switch control circuit switches the switch on during a high voltage period in an AC component of an input pulse signal and switches the switch off during a low voltage period of the AC component. The circuit shapes the input pulse signal into an output pulse signal whose peak-to-peak voltage is equivalent to a peak-to-peak voltage of the AC component and whose voltage during the high voltage period is at the target constant voltage.