LED Driver Power Control Circuit for Low Standby Current
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Solution Overview
Problem
LED driver circuits in portable electronic devices consume a constant working current even in non-working states, reducing battery runtime.
Innovation Solution
A power consumption control circuit comprising a data serial-to-parallel module, data counting module, and power consumption mode determination module to manage power modes based on data reception, allowing the circuit to enter a power-saving mode when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED driver chip continuously operates to ensure immediate responsiveness, then the control reliability is improved, but the power consumption increases and battery runtime decreases
Solution Approach 1:
The LED driver chip dynamically switches between working mode and power-saving mode based on whether valid data is received. The chip enters power-saving mode after detecting a preset number of invalid data packets, reducing power consumption from approximately 1mA to a minimal standby current, while still maintaining the capability to immediately resume normal operation when valid data arrives
2Duration of action of moving object
If the LED driver chip enters power-saving mode to reduce power consumption, then the battery runtime is extended, but the response time to resume working state increases
Solution Approach 1:
The chip performs preliminary detection of data validity using a counter mechanism that tracks invalid data packets. When the counter reaches a preset threshold, the chip proactively transitions to power-saving mode before actual power depletion occurs, ensuring smooth and timely mode switching without significant delay when valid data arrives
3Speed
If the LED driver chip continuously monitors data to maintain working state, then the responsiveness is improved, but the power consumption in non-working state remains high
Solution Approach 1:
The LED driver chip autonomously monitors incoming data packets and self-determines when to transition between working and power-saving modes. The built-in counter and control logic automatically detect invalid data patterns and trigger mode switching without external intervention, reducing standby power consumption while maintaining rapid response capability through continuous background monitoring
Data Source
AI summary
A power consumption control circuit, a chip, and an electronic device; the circuit includes: a data serial-to-parallel module that converts serial input data into parallel data and sequentially outputs the least significant bit of the parallel data; a data counting module that generates a valid flag bit when the number of valid data bits in the serial data reaches a preset value; a data latch control module that generates a valid latch pulse after the to-be-controlled circuit completes the reception and transmission of data; a power consumption mode determination module that generates a power consumption control signal for the to-be-controlled circuit; when valid data is received and there is a need to control the downstream circuit, the power consumption control signal switches the to-be-controlled circuit into working mode; otherwise, the power consumption control signal switches the to-be-controlled circuit into power-saving mode.