Power Saving Circuit for PWM Control
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Solution Overview
Problem
PWM circuits in electronic devices continue to consume power even when their controlled circuits are disabled, leading to inefficiency and waste due to non-effective protection circuits still operating.
Innovation Solution
A power saving circuit that includes a switching circuit to generate a switching signal and a dead-time control circuit to disable internal circuits when the switching signal is disabled, reducing power consumption by effectively controlling and shutting down these circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the switching signal is disabled to control the controlled circuits, then the controlled circuits are turned off for power saving, but the internal circuits (such as protection circuit) continue to operate and consume power unnecessarily
Solution Approach 1:
The patent segments the control function by introducing a dead-time control signal that is separate from the switching signal. This dead-time control signal specifically targets the internal circuits (protection circuit, dead-time controller) to disable them independently when the switching signal is disabled, while the switching signal controls the controlled circuits. This segmentation allows selective power saving without affecting the overall system control complexity.
Solution Approach 2:
The patent implements preliminary action by generating the dead-time control signal in advance based on the switching signal state. When the switching signal is disabled, the dead-time control signal is generated to preemptively disable the internal circuits before they can continue consuming power. This preliminary control action ensures that power is saved as soon as the switching signal changes state, resolving the contradiction between power saving and control simplicity.
2Reliability
If the internal circuits remain operational when the switching signal is disabled, then the protection function is maintained, but power is wasted on non-effective circuits
Solution Approach 1:
The patent applies dynamics by making the operational state of internal circuits dynamic rather than static. The dead-time control signal dynamically adjusts the state of internal circuits based on the switching signal. When the switching signal is enabled, internal circuits operate to provide protection; when the switching signal is disabled, the dead-time control signal dynamically disables the internal circuits to save power. This dynamic control resolves the contradiction between maintaining reliability and reducing power consumption.
Solution Approach 2:
The patent changes the control parameter from a single switching signal to two separate control signals (switching signal and dead-time control signal). This parameter change allows independent control of controlled circuits and internal circuits. The dead-time control signal serves as an additional parameter that specifically regulates the power state of internal circuits, enabling the system to maintain protection function when needed while saving power when the switching signal is disabled.
3Loss of energy
If a dead-time control circuit is added to generate dead-time control signal, then power consumption is reduced by disabling internal circuits, but the device complexity increases
Solution Approach 1:
The dead-time control circuit is designed with multi-functionality to reduce overall system complexity. The same dead-time control circuit generates both the dead-time control signal for disabling internal circuits and works in conjunction with the switching signal to control the controlled circuits. This universal circuit performs multiple functions (controlling internal circuit power state and coordinating with switching signal), thereby reducing the need for separate dedicated circuits and minimizing the increase in overall device complexity while achieving power savings.
Data Source
AI summary
The present invention provides a power saving circuit for PWM circuit. The power saving circuit is utilized to control at least one internal circuit. The power saving circuit comprises a switching circuit which generates a switching signal. The power saving circuit controls the internal circuit in response to the switching. The power saving circuit disables the internal circuit for power saving when the switching signal is disabled.