Dual-Load Driver Circuit With PFC Ripple Compensation
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Solution Overview
Problem
Existing driver arrangements for LED lighting suffer from high material and space requirements due to double-stage converting circuitry, and they fail to efficiently manage power factor correction (PFC) output signal ripple, leading to perceptible flicker and inefficient standby power consumption.
Innovation Solution
A driver arrangement using a switched-mode power supply (SMPS) to superimpose an offset signal with the PFC output signal to attenuate ripple and provide dual functionality, enabling efficient power distribution between a primary load and a secondary load, including standby mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If double-stage converting circuitry is used to regulate PFC output signal, then the ripple in PFC output signal is reduced, but material cost and space requirements increase
Solution Approach 1:
The invention segments the power conversion function into two distinct parts: the PFC circuitry handles power factor correction and generates the PFC output signal, while a separate switching converting circuitry handles only the AC component compensation. This segmentation allows each circuit to be optimized for its specific function, reducing the overall size and material requirements compared to a double-stage converting circuitry where both functions are integrated into high-power rating components.
Solution Approach 2:
The switching converting circuitry is designed to compensate only for the AC component of the PFC output signal rather than handling the entire PFC output signal. This partial action approach means the switching converting circuitry can operate at a lower power rating, significantly reducing the size and material cost of its components while still achieving the goal of ripple reduction.
2Weight of stationary object
If switching converting circuitry is used to compensate only AC component, then power rating and size are reduced, but standby power consumption increases
Solution Approach 1:
The invention introduces dynamic control mechanisms including mode switching capability and adaptive duty cycle adjustment. The controller can switch between different operating modes (first mode with both PFC and switching converting circuitry active, second mode with only PFC active) and dynamically adjust the duty cycle of the switching converting circuitry based on load conditions. This dynamic adaptation allows the system to minimize power consumption during standby while maintaining ripple compensation during active operation.
Solution Approach 2:
The controller changes operational parameters (duty cycle, switching frequency, circuitry activation state) based on system conditions. During standby mode, the duty cycle is reduced or the switching converting circuitry is deactivated, changing the operational parameters to minimize power consumption. During active mode, parameters are adjusted to optimize ripple compensation performance.
3Use of energy by stationary object
If PFC circuitry is disabled in standby mode, then power consumption is reduced, but power supply to second load cannot be maintained
Solution Approach 1:
The switching converting circuitry is designed with multi-functionality to serve dual purposes: it compensates for the AC component of the PFC output signal during active mode and provides power supply to the second load during standby mode. This universal design allows a single circuit component to fulfill multiple functions across different operating modes, eliminating the need for separate power supply circuitry for standby operations.
Solution Approach 2:
The switching converting circuitry is pre-configured and maintained in a ready state during active mode, with its components (inductor, capacitor, switching element) already in place and controlled. This preliminary preparation allows the circuitry to seamlessly transition to providing power supply function during standby mode without requiring additional components or complex reconfiguration, ensuring reliable power delivery to the second load when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces circuit size, power consumption, and flicker while maintaining efficient power delivery to both loads, aligning with smart lighting trends and reducing standby power loss.
Implementation Method 1
uses a switched-mode power supply to: generate an offset signal such that the offset signal and the PFC output signal provided to the first load are superimposed, to compensate the ripple
Implementation Method 2
a power factor correction, PFC, circuitry connected to the input interface and comprising a first output interface adapted to electrically connect to a first load, the power factor correction circuitry being configured to operate to generate, from the AC mains power, a PFC output signal
Implementation Method 3
generate a first supply power for a second load different from the first load
Data Source
AI summary
A driver arrangement for powering a first load in an operation mode and a second load in a second mode. In the operation mode, a power factor correction circuitry generates a PFC output signal that powers the first load, and a switched-mode power supply is able to generate an offset signal that is superimposed over the PFC output signal for attenuating a ripple in the PFC output signal. In the second mode, the power factor correction circuitry is disabled and the switched-mode power supply is able to generate a supply power for the second load meanwhile disabled from generating the offset signal. The switched-mode power supply therefore provides a dual functionality.