Optical Latch Circuit With Light-Threshold Standby Power Blocking
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Solution Overview
Problem
Existing optical latch circuits consume battery power through photocurrent even when light is not strong enough to activate the circuit, leading to increased power consumption and reduced battery lifespan during non-operation periods.
Innovation Solution
An optical latch circuit with a voltage detector, a photovoltaic element, and a feedback resistor that only allows power generation when the light intensity exceeds a predetermined threshold, preventing unnecessary power consumption by maintaining the drive control signal at a 'H' level unless sufficient light is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photodiodes are connected to battery in reverse bias configuration, then light detection function is achieved, but photocurrent flows continuously consuming battery power even during non-operation periods
Solution Approach 1:
The patent applies preliminary action by pre-configuring the photodiodes in forward bias connection to the battery, preparing the circuit in advance to block photocurrent flow during non-operation periods. This preliminary configuration ensures that no power is consumed until light detection is actually needed, at which point the circuit transitions to reverse bias mode.
Solution Approach 2:
The patent implements dynamics by making the photodiode connection mode changeable between forward bias and reverse bias configurations. The switching mechanism allows the circuit to dynamically adapt its state: during non-operation periods, photodiodes are in forward bias to block current; during operation, they switch to reverse bias to enable light detection. This dynamic switching resolves the contradiction between continuous detection capability and power consumption.
2Illumination intensity
If transparent resin is used as sealing material to allow light to reach optical latch circuit, then light transmission is achieved, but light cannot be blocked during non-operation periods
Solution Approach 1:
The patent applies preliminary action by pre-configuring the photodiodes in forward bias connection to the battery, preparing the circuit in advance to block photocurrent flow during non-operation periods. This preliminary configuration ensures that no power is consumed until light detection is actually needed, at which point the circuit transitions to reverse bias mode.
Solution Approach 2:
The patent implements dynamics by making the photodiode connection mode changeable between forward bias and reverse bias configurations. The switching mechanism allows the circuit to dynamically adapt its state: during non-operation periods, photodiodes are in forward bias to block current; during operation, they switch to reverse bias to enable light detection. This dynamic switching resolves the contradiction between continuous detection capability and power consumption.
3Use of energy by moving object
If insulator is inserted between battery electrode and electronic device electrode to block current, then standby power consumption is reduced, but device activation requires removing insulator which complicates structure
Solution Approach 1:
The patent replaces the mechanical insulator-removal system with an electrical switching system. Instead of physically removing insulators or moving mechanical parts to activate the device, the invention uses electronic switching of photodiode bias configurations. This substitution eliminates complex mechanical structures while achieving the same functional result of controlling power flow and device activation.
Solution Approach 2:
The patent applies self-service by designing the photodiode switching mechanism to be automatically controlled by light detection signals. When ambient light is detected, the circuit automatically transitions from forward bias to reverse bias mode, activating the device without requiring external manual intervention or complex control systems. The system serves itself by using the light signal to trigger its own activation.
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
Significantly reduces battery power consumption during non-operation periods by only allowing power generation when light intensity meets the required threshold, thereby extending battery lifespan and simplifying handling by eliminating the need for light-blocking mechanisms.
Implementation Method 1
a first photovoltaic element (for example, a photovoltaic element 12) connected between the first input terminal and a grounding point in a forward direction and configured to output a first power generation voltage to the first input terminal according to photovoltaic power when light is radiated
Data Source
AI summary
According to the present invention, an optical latch circuit includes a voltage detector configured to compare a first power generation voltage input from a first input terminal with a preset first threshold voltage and output a set signal from a determination output terminal when the first power generation voltage exceeds the first threshold voltage, a first photovoltaic element connected between the first input terminal and a grounding point in a forward direction and configured to output a first power generation voltage to the first input terminal according to photovoltaic power when light is radiated, and a feedback resistor inserted between the first input terminal and the determination output terminal.