Three-Switch Latch Circuit for Fixed Output Voltage
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Solution Overview
Problem
Existing latch circuits used in vehicles require a large number of switches to fix an output voltage, making them bulky and difficult to install.
Innovation Solution
A latch circuit design utilizing a first switch, a first resistor, a second switch, and a third switch, where the second switch or third switch is activated when the voltage across the first resistor reaches a threshold, allowing the output voltage to be fixed to a predetermined value with only three switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional latch circuit design is used to fix an output voltage, then the output voltage can be fixed to a predetermined value, but the number of switches required is large, making the circuit bulky and difficult to install
Solution Approach 1:
The patent combines multiple switch functions into a reduced set of three switches (first switch, second switch, third switch) that work together in a coordinated manner. The first switch responds to threshold voltage conditions, while the second and third switches handle different input voltage scenarios, merging their functions to achieve the latch effect with fewer components than conventional designs.
Solution Approach 2:
The latch circuit is segmented into distinct functional blocks: a first switch for threshold detection, a second switch for one input voltage condition, and a third switch for another input voltage condition. Each switch is responsible for a specific segment of the voltage fixing operation, allowing the system to maintain reliability through functional distribution while reducing overall component count.
2Volume of moving object
If the number of switches is reduced to minimize circuit size, then the latch circuit becomes smaller and easier to install, but it may become difficult to maintain the output voltage fixing function reliably
Solution Approach 1:
Each switch in the three-switch configuration is assigned a specific local function: the first switch monitors the voltage across the first resistor for threshold conditions, the second switch handles a specific input voltage range, and the third switch handles another input voltage range. This local specialization ensures that each component operates reliably within its designated function, maintaining overall system reliability despite the reduced number of switches.
Solution Approach 2:
The circuit is designed with preliminary threshold detection capability through the first switch, which activates when the voltage across the first resistor reaches a predetermined threshold. This preliminary action triggers the appropriate switch (second or third) to engage, ensuring the output voltage is fixed before any potential instability can occur, thereby maintaining reliability in the compact design.
Data Source
AI summary
In a first switch of a latch circuit, when the voltage between an emitter (input end) and a base (control end) has increased to a threshold voltage or more, the first switch is switched from off to on. The current that flows through a first resistor and a second resistor in that order is input to a collector (input end) of a second switch and a comparator switch. The second switch is switched on when the first switch is switched on. When the second switch or the comparator switch (third switch) is on, the voltage across the first resistor is the threshold voltage or more. A voltage is input to the emitter of the first switch from a microcomputer. A voltage is output from the collector of the second switch to a driving circuit.