Single-Pin Controller for Power Conversion Protection and Frequency Reduction
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Solution Overview
Problem
Small-form-factor power converters face challenges in implementing power-saving and protection functions due to limited pin count, and using a larger pin count increases manufacturing costs and may be incompatible with existing architectures.
Innovation Solution
A controller design that utilizes a single pin to provide protection and frequency-reduction functions through a voltage sense pin, current source, switch, sampling unit, comparator, threshold voltages generation unit, and PWM unit, which adjusts switching frequency and shuts down the PWM signal when necessary, without requiring a larger pin count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger pin count package is used to provide protection and frequency-reduction functions, then the functionality and reliability are improved, but the manufacturing cost and board area increase
Solution Approach 1:
The voltage sense pin is designed to perform multiple functions: it samples voltages during both PWM high and low states, enables protection detection through comparator circuits, and supports frequency-reduction functionality through threshold voltage comparisons. This multi-functionality eliminates the need for additional dedicated pins, maintaining reliability while reducing pin count and manufacturing cost
Solution Approach 2:
The patent combines protection detection and frequency-reduction functions into a single integrated circuit implementation using shared components. The sampling unit, comparator, and threshold voltage generation unit work together to provide both functions through the same voltage sense pin, merging what would traditionally require separate hardware blocks into a unified structure that reduces overall complexity and cost
2Adaptability or versatility
If a larger pin count package is used to provide protection and frequency-reduction functions, then the functionality is improved, but the board area increases
Solution Approach 1:
The voltage sense pin serves dual purposes by enabling both protection detection and frequency-reduction control through the same physical pin. The sampling unit captures voltages at different PWM states, and the threshold voltage generation unit processes these samples to control switching frequency, all through the single pin interface, thereby achieving versatility without increasing board footprint
3Use of energy by moving object
If more pins are used to implement power-saving and protection functions, then the power management capability is improved, but the compatibility with existing architectures deteriorates
Solution Approach 1:
The controller performs self-diagnosis and self-regulation by using its existing voltage sense pin to monitor its own operating conditions. The sampling unit detects voltage levels during PWM operation, the comparator evaluates these against reference thresholds, and the system automatically adjusts frequency or shuts down based on detected conditions, enabling power-saving and protection without external intervention or additional pins, thus maintaining compatibility
Data Source
AI summary
A controller providing protection function and frequency-reduction function for a power conversion application, including: a voltage sense pin; a current source; a switch having a first end coupled to the current source, a second end coupled to the voltage sense pin, and a control end coupled with a control signal; and a sampling unit having a first node coupled to the voltage sense pin, a second node for providing the control signal, a third node for receiving a PWM signal, a fourth node for providing a first sampled voltage for a protection function, and a fifth node for providing a second sampled voltage for a frequency-reduction function.