Power Supply Control System for Reverse Current Prevention

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing power supply control systems using diode OR circuits incur significant voltage drop and power loss, especially in low power systems, and fail to prevent reverse current damage to primary batteries when connected with solar batteries.

Innovation Solution

A power supply control system with semiconductor integrated circuits featuring switching circuits that compare voltage levels to selectively connect or disconnect battery and solar battery power sources to a load, minimizing voltage drop and preventing reverse current flow by using P-channel MOS transistors and resistors to manage voltage levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a diode OR circuit is used to switch between solar battery and primary battery power sources, then reverse current prevention is achieved, but significant voltage drop and power loss occur

Engineering Contradiction:

Improvereverse current preventionVSAvoidpower loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent changes the electrical parameters of the switching mechanism by using MOS transistors with controllable resistance instead of fixed diode characteristics. By adjusting the gate voltage of the MOS transistors, the resistance can be dynamically changed to minimize voltage drop while maintaining reverse current blocking capability through the control circuit that monitors battery voltages and switches appropriately.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the passive diode-based mechanical switching system with an active MOS transistor-based electronic switching system controlled by voltage comparison circuits. This substitution allows for more precise control of the switching behavior and reduced power loss through intelligent decision-making based on real-time voltage measurements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a diode OR circuit is used to prevent reverse current, then battery protection is provided, but voltage drop of at least 0.7V occurs due to diode resistance

Engineering Contradiction:

Improvebattery protectionVSAvoidvoltage drop

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional reverse current prevention devices are used, then rechargeable battery protection is achieved, but primary battery damage from reverse current is not prevented

Engineering Contradiction:

Improverechargeable battery protectionVSAvoidprimary battery damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent creates a universal power supply switching system that simultaneously protects both primary and rechargeable batteries from reverse current damage. The control circuit is designed to monitor both battery voltages and implement protection logic for both battery types, making the system multi-functional in terms of battery protection rather than specialized for only one battery type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 power loss and prevents reverse current flow, ensuring efficient power supply to loads while protecting primary batteries from damage, outperforming conventional diode-based systems.

Implementation Method 1

the first switching section compares a first voltage that is the battery output voltage dropped by a first voltage level, and a second voltage that is a voltage at the connection point to the load dropped by a second voltage level

Methodology Applied

Scientific EffectVoltage comparison:

Implementation Method 2

by using P-channel MOS transistors and resistors to manage voltage levels

Methodology Applied

Scientific EffectMOS transistor switching:

Data Source

PatentUS9246331B2Power supply control system and semiconductor integrated circuit

Publication Date: 2016.01.26 LAPIS SEMICON CO LTD

AI summary

A power supply control system and a semiconductor integrated circuit that may prevent reverse current flow from a solar battery to a primary battery includes first and second switching circuits. In the first switching circuit, a first voltage that is the primary battery output voltage dropped by a first voltage level and a second voltage that is the load side voltage dropped by a second voltage level are compared by a comparator. Electrical connection between the primary battery and the load is disconnected when the second voltage is equal to or greater than the first voltage. In the second switching circuit for a solar battery and the load, the switching circuit is similarly switched OFF before the load side voltage exceeds the output voltage of the primary battery or the solar battery, preventing damage to the battery due to reverse flow of current.