LED Driver Power Control Circuit for Energy Reduction
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Solution Overview
Problem
Existing driver devices for light emitting elements consume power even when not all LEDs are in use, leading to inefficient energy dissipation, especially in applications like LED displays and signboards, where only a fraction of the devices are active at any given time.
Innovation Solution
A driver device with a power control circuit that automatically shuts down or powers up the current control circuit based on the logical state of the data input, reducing power consumption without external action, and maintaining operational features similar to prior art.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If driver devices are coupled in daisy-chain configuration to drive LED panels, then the system can provide constant current to multiple LEDs, but power is consumed continuously even when not all LEDs are active
Solution Approach 1:
The driver system is divided into multiple independent driver devices (2A-2E) that can be individually controlled. Each driver device has its own power control circuit that can independently shut down or power up based on whether its associated LEDs are active, allowing selective power management of individual segments rather than the entire system.
Solution Approach 2:
Each driver device includes an automatic power control circuit that monitors its own operational state and automatically shuts down or powers up without requiring external control. The driver device serves itself by detecting when it needs power based on its own LED activation state, eliminating the need for continuous external power management.
2Speed
If driver devices continuously supply current to maintain readiness, then LEDs can be activated immediately, but energy is dissipated even when LEDs are not in use
Solution Approach 1:
The driver device maintains the capability to activate LEDs immediately by keeping control circuits ready, but physically shuts down current supply paths when LEDs are not active. The power control circuit prepares the system for quick activation while preventing energy dissipation during idle periods through automatic shutdown mechanisms.
Solution Approach 2:
The driver device switches between active and shutdown states based on periodic control signals. When a control signal indicates LED activation is needed, the driver powers up; when no activation is needed, the driver shuts down. This periodic switching allows the system to respond to activation needs while minimizing continuous energy dissipation.
3Adaptability or versatility
If all driver channels remain active to handle any LED configuration, then system versatility is maintained, but power consumption increases
Solution Approach 1:
Different driver channels are treated differently based on their specific operational needs. Each driver device can be independently in an active or shutdown state, allowing the system to maintain versatility by having individual channels available when needed while reducing power consumption by shutting down channels that are not currently required for the displayed configuration.
Data Source
AI summary
A driver device for driving light emitting elements comprises a data latch having an input coupled to an input signal, a current control circuit having an input coupled to the data latch, and an output coupled to the input of an output stage, the latter being configured to drive the light emitting elements. The driver device has a power control circuit having an input coupled to the output of the data latch and an output coupled to the input of the current control circuit. The power control circuit is configured to control the current control circuit and the latter is configured to deliver a first current when the data inputted to the power control circuit is in a first state and a second current when at least part of the data inputted to the power control circuit is in a second state.