Multi-Motor Power Circuit With Shared Bus and Backup Operation
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Solution Overview
Problem
Existing motor power systems have complex structures, low efficiency, and low reliability, and main devices fail to operate stably and reliably during power failures.
Innovation Solution
A multi-motor integrated power circuit with a standby power source, busbar, power conversion circuits, isolation circuits, and a control circuit that integrates power factor correction and centralized control to regulate power signals, ensuring stable operation and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent rectification modules and drive modules are used for each motor, then each module can be controlled separately, but the overall system structure becomes complex and efficiency decreases
Solution Approach 1:
The patent merges multiple independent rectification modules and drive modules into a single integrated power circuit that can serve multiple motors. The integrated circuit includes a unified rectification section, a common DC bus, and multiple independent drive sections that can control different motors separately. This combining approach maintains the operational independence of each motor while eliminating the structural complexity of having completely separate modules for each motor.
2Ease of operation
If independent circuits control each module separately, then module-level control is achieved, but system reliability decreases and main devices cannot operate stably during power failure
Solution Approach 1:
The integrated power circuit incorporates a power failure detection mechanism that monitors the AC power source status continuously. When a power failure is detected, the system automatically switches to an independent operation mode using the stored energy in the DC bus capacitor, ensuring uninterrupted motor operation. This preliminary detection and preparation approach maintains system reliability during power failures while preserving module-level control capabilities.
3Adaptability or versatility
If multiple independent modules are used, then each motor can be driven independently, but the overall system efficiency becomes low
Solution Approach 1:
The patent combines multiple rectification functions into a single efficient rectification stage that feeds a common DC bus, eliminating redundant rectification circuits for each motor. Each motor drive section independently controls its motor from this shared DC source, maintaining independent drive capability while reducing overall energy losses through the shared power conversion architecture.
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 integrated power circuit simplifies hardware, improves reliability, reduces control delays, and enhances precision, allowing motor loads to operate stably even in power outages or failures.
Implementation Method 1
an isolation transformer includes one piece of primary winding and two or more pieces of secondary winding coupled with the primary winding
Data Source
AI summary
A muti-motor integrated power circuit includes: a power input conversion circuit configured to convert a power input signal from a standby power source to a busbar power signal; a power factor correction circuit configured to convert and superpose an AC input signal of the AC power source with the busbar power signal; a first isolation circuit configured to convert the busbar power signal to an isolation output signal; a first switch sub-circuit configured to convert the busbar power signal to a first AC signal; an isolation transformer configured to convert the first AC signal to at least two second AC signals; a first power conversion circuit or an isolation transformer configured to convert the isolation output signal or the second AC signal to a DC drive signal; and a second power conversion circuit configured to convert the isolation output signal or the second AC signal to an AC drive signal.