Boot Voltage Pin Multifunctionality in Power Conversion
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Solution Overview
Problem
The increasing number of pins in integrated circuits for controlling light emission, such as in LED control circuits, poses a challenge due to higher packaging costs, necessitating a reduction in pin count while maintaining normal operation.
Innovation Solution
A power conversion apparatus that includes a power conversion circuit with upper and lower bridge switches, a control circuit with a detecting circuit and an adjusting signal generating circuit, which detects current flowing into the boot voltage input pin, converts it to a detecting voltage, and generates an adjusting signal to control the conduction states or frequencies of the bridge switches, effectively utilizing the boot voltage input pin for current sensing and reducing the number of pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of pins in the control circuit is increased to support additional functions, then the functionality and control capability are improved, but the packaging cost and device complexity increase
Solution Approach 1:
The boot voltage input pin is made multifunctional by enabling it to perform both its original boot voltage input function and a new current sensing function. The detecting circuit is integrated into the control circuit and couples to the boot voltage input pin, allowing the same pin to serve dual purposes without requiring an additional dedicated current sensing pin.
Solution Approach 2:
The current sensing function is merged with the existing boot voltage input pin rather than being implemented as a separate function. The detecting circuit combines the boot voltage input functionality with current detection capability, consolidating multiple functions into a single pin interface.
2Reliability
If additional current sensing pins are added to enable overcurrent protection, then the reliability is improved, but the packaging cost and pin count increase
Solution Approach 1:
The boot voltage input pin is repurposed to also function as a current sensing pin for overcurrent protection. By detecting the current flowing through the boot capacitor charging current, the system achieves overcurrent protection capability without requiring a separate current sensing pin.
Solution Approach 2:
The boot voltage input pin serves itself by performing both voltage input and current sensing functions. The detecting circuit utilizes the existing pin infrastructure to provide protective functionality, eliminating the need for additional dedicated protection pins.
3Productivity
If the control circuit integrates more functions, then the productivity and efficiency are improved, but the manufacturing cost increases
Solution Approach 1:
Multiple functions (boot voltage input, current sensing, overcurrent protection) are merged into the control circuit using shared components and the boot voltage input pin. This integration reduces the total component count and simplifies the circuit structure, thereby reducing manufacturing costs while maintaining improved productivity.
Data Source
AI summary
A power conversion apparatus is provided. A detecting circuit detects a current flowing into a boot voltage input pin and converts the current into a corresponding detecting voltage. An adjusting signal generating circuit generates an adjusting signal according to the detecting voltage. A control circuit adjusts control parameters thereof according to the adjusting signal.