Three-phase Motor Control Circuit Without Gate Driver
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Solution Overview
Problem
Conventional three-phase motor control systems require a gate driver to convert control signals to operational levels, increasing costs and relying on direct controller control to manage power supply and failures, which is inefficient and costly.
Innovation Solution
A three-phase motor control circuit that includes an inverter circuit, a relay switch, an operation circuit to calculate operational levels, and an amplification circuit to amplify control signals, allowing the relay switch to operate without a gate driver and independently determine power supply and failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate driver is used to convert control signals to operational levels for the relay switch, then the relay switch can operate reliably, but the system cost increases
Solution Approach 1:
The patent extracts and removes the gate driver component from the system by implementing control signal amplification directly within the controller. The controller generates control signals with sufficient operational level directly, eliminating the need for a separate gate driver stage while maintaining relay switch reliability.
Solution Approach 2:
The patent merges the control signal amplification function into the controller unit. The controller simultaneously performs microcontroller operations and signal amplification, combining multiple functions into a single integrated component rather than using separate gate driver circuitry.
2Ease of operation
If the controller directly controls the relay switch operation, then the control is simple, but the system cannot independently detect inverter circuit failures
Solution Approach 1:
The patent implements a feedback mechanism where the relay switch output state is fed back to the controller. The controller monitors the actual relay switch operation state and compares it with the intended control signal, enabling automatic detection of inverter circuit failures without complicating the control structure.
Solution Approach 2:
The system performs self-diagnosis by having the controller automatically detect failures through monitoring the relay switch output. The inverter circuit failure detection is achieved through the system's own control and monitoring mechanisms without requiring external diagnostic equipment.
Data Source
AI summary
The present disclosure relates to a three-phase motor control circuit including an inverter circuit configured to convert input power into three-phase power, a relay switch configured to determine whether the three-phase power is input to a three-phase motor on the basis of a control signal of an operational level, an operation circuit configured to calculate the three-phase power and the input power to generate the operational level, and an amplification circuit configured to amplify a control signal of an initial level, which is generated by a controller for operating the relay switch, to be a control signal of the operational level on the basis of the generated operational level.