PWM Control Circuit for Voltage Transient Response
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Solution Overview
Problem
Control systems in the electronics industry face challenges in rapidly and accurately regulating current in loads due to rapid changes in supply voltage, leading to delayed response times and transient disturbances.
Innovation Solution
A control system that includes a voltage supply measurement circuit and an innovative PWM generation circuit, which generates a duty cycle proportional to the average load current and inversely proportional to the solenoid supply voltage, allowing for rapid response to supply voltage transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional control systems are used to regulate current in loads, then the system structure is simple, but the response time is delayed and transient disturbances occur during supply voltage transitions
Solution Approach 1:
The control system performs preliminary action by measuring the supply voltage and predicting the duty cycle adjustment needed before the actual voltage transient occurs. The system calculates the expected duty cycle based on the measured supply voltage and load characteristics, allowing it to respond instantaneously to voltage changes without waiting for traditional feedback loops to detect and react to the transient.
Solution Approach 2:
The patent introduces an intermediary calculation mechanism that computes the duty cycle based on the relationship between supply voltage and load characteristics. This intermediary process acts as a bridge between the supply voltage measurement and the final control output, enabling rapid response by pre-calculating the appropriate duty cycle adjustment based on measured voltage conditions.
2Reliability
If conventional control systems regulate current during rapid supply voltage changes, then the control logic is simple, but overshoot and transient disturbances occur
Solution Approach 1:
The control system implements feedback by continuously measuring the supply voltage and using this information to adjust the duty cycle. The system measures the actual supply voltage, compares it with expected values, and adjusts the duty cycle accordingly to maintain stable current regulation. This feedback mechanism prevents overshoot by proactively adjusting the control output based on measured voltage conditions.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the duty cycle parameter based on measured supply voltage conditions. The system changes the duty cycle parameter in response to voltage transients, ensuring that the control output adapts to varying supply conditions. This parameter adjustment prevents transient disturbances and maintains current regulation stability during voltage changes.
3Adaptability or versatility
If traditional PWM control is used, then the control method is simple, but the system cannot accommodate rapid voltage changes without transient disturbances
Solution Approach 1:
The PWM generation circuit implements dynamics by making the duty cycle adjustable and responsive to changing supply voltage conditions. Rather than using a fixed or简单地 adjustable duty cycle, the system dynamically calculates and adjusts the duty cycle based on real-time supply voltage measurements and load characteristics. This dynamic adjustment enables the system to accommodate rapid voltage changes without transient disturbances.
Data Source
AI summary
One embodiment relates to a control system. In one embodiment, a control system is configured to drive a load based on a set-point of the load, a measured load characteristic and a supply voltage of the load. The controller is configured to determine a duty cycle based on the load characteristic, the set-point, and the supply voltage. The controller is further configured to drive the load in response to the duty cycle.