Motor Controller Standby Power Reduction via Switch Circuit Decoupling
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Solution Overview
Problem
Motor controllers consume excess power in standby mode due to all components remaining powered, leading to decreased energy efficiency.
Innovation Solution
A motor controller with a switch circuit that decouples the low-power supply and inverter from the DC bus when a control signal is absent, preventing power consumption during standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all components of the motor controller remain powered while the motor is in standby mode, then the motor controller can respond quickly when needed, but standby power consumption increases
Solution Approach 1:
The motor controller is segmented into multiple power domains: a first power domain keeps the control circuit powered for quick response, while a second power domain powers down the inverter and other components during standby. This segmentation allows different parts of the system to have different power states simultaneously, resolving the contradiction between quick response and low standby consumption.
Solution Approach 2:
The system dynamically adjusts power distribution based on operational mode. During standby, the controller dynamically disconnects power to non-essential components while maintaining power to the control circuit. When operation is required, power is dynamically restored to all components. This dynamic power management enables the system to adapt its power consumption to actual needs.
2Reliability
If all components remain powered during standby mode, then component reliability is maintained, but energy efficiency decreases
Solution Approach 1:
The controller divides components into critical and non-critical groups. Critical components (control circuit) remain powered to maintain system reliability and readiness. Non-critical components (inverter, motor drive) are powered down during standby to eliminate unnecessary energy loss. This selective power management maintains reliability while improving energy efficiency.
Solution Approach 2:
The system changes the power state parameter of different components based on operational requirements. During standby, the power parameter is changed from 'powered' to 'powered down' for non-essential components. When operation is needed, the parameter is changed back. This parameter change enables the system to optimize energy efficiency without permanently compromising reliability.
Data Source
AI summary
A motor controller having low standby power consumption is provided. The motor controller includes a direct current (DC) bus. The motor controller also includes a low-power supply. The motor controller also includes an inverter configured to control a supply of current to stator windings of a motor. The motor controller also includes a switch circuit coupled between the DC bus and the low-power supply. The motor controller also includes a switch controller coupled to the switch circuit and configured to be coupled to a system controller. The switch controller is configured to control the switch circuit to electrically decouple, in response to detecting an absence of a control signal from the system controller, the DC bus from the low-power supply.