Electronic Load PWM Switching After Preliminary Phase Locking

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Solution Overview

Problem

Existing electronic load devices experience delays and adverse effects such as backfeeding and divergence when simulating power consumption in fixed current mode due to signal locking requirements, preventing timely power consumption simulation.

Innovation Solution

An electronic load device with a power module, detection module, and processor that controls load current as a first current signal synchronized with the output voltage signal, uses a phase lock loop for signal locking, and switches to a second current signal via pulse width modulation to stabilize the load current without delay.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If signal locking is performed on the alternating-current voltage signal before drawing current in fixed current mode, then adverse effects such as backfeeding and divergence are avoided, but a delay period occurs preventing timely power consumption simulation

Engineering Contradiction:

Improveavoidance of backfeeding and divergence effectsVSAvoiddelay period before power consumption simulation

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing signal locking on the alternating-current voltage signal before the fixed current mode operation begins. The processor executes the phase-locking procedure in advance to synchronize the electronic load's internal oscillation signal with the input voltage signal, ensuring that when the fixed current mode starts, the signal locking is already complete. This eliminates the delay period while maintaining reliability by preventing backfeeding and divergence effects.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If current is drawn directly from the power supply device before signal locking is completed, then power consumption simulation starts immediately, but adverse effects such as backfeeding and divergence occur on the power supply device

Engineering Contradiction:

Improvetimeliness of power consumption simulationVSAvoidbackfeeding and divergence effects on power supply device

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent resolves this contradiction by performing the signal locking procedure as a preliminary action before initiating the fixed current mode. The processor completes the phase-locking operation, which synchronizes the internal oscillation signal with the input voltage signal, before starting to draw current. This ensures that when power consumption simulation begins immediately, the signal locking is already established, preventing backfeeding and divergence effects while maintaining productivity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs feedback mechanisms through the phase-locking procedure, where the processor continuously monitors the phase difference between the input voltage signal and the internal oscillation signal, and adjusts the oscillation frequency until synchronization is achieved. This feedback control ensures that the electronic load operates in sync with the power supply device, preventing harmful backfeeding and divergence effects while enabling immediate power consumption simulation.

Inventive Principle:

Principle #23Feedback

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

Enables timely and stable power consumption simulation without backfeeding or divergence effects by synchronizing the load current with the output voltage signal and completing signal locking efficiently.

Implementation Method 1

input the output voltage signal to a phase lock loop model for signal locking

Methodology Applied

Scientific EffectPhase lock loop:

Implementation Method 2

generate a first pulse width modulation signal according to a received current parameter when the signal locking is completed, so that the switching load of the power module controls the load current to switch from the first current signal to a second current signal according to the first pulse width modulation signal

Methodology Applied

Scientific EffectPulse width modulation:

Data Source

PatentUS20250306126A1Electronic load device and operating method thereof

Publication Date: 2025.10.02 CHROMA ATE INC

AI summary

An electronic load device and an operating method thereof are provided. The operating method for the electronic load device includes operating a power module to control a load current drawn from a device under test as a first current signal according to a resistance parameter and an output voltage signal detected from the device under test, where the initial phase of the first current signal is the same as the initial phase of the output voltage signal; inputting the output voltage signal to a phase lock loop model for the signal locking; and generating a first pulse width modulation signal according to the received current parameter when the signal locking is completed, so that a switching load of the power module controls the load current to switch from the first current signal to a second current signal according to the first pulse width modulation signal.