Frequency Converter Circuit Switching Rectifier to Standby Inverter
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Solution Overview
Problem
In existing AC input frequency converters modified for DC power supply, the rectifier unit becomes idle after converting AC to DC, unable to effectively drive motors.
Innovation Solution
A driving circuit and method that includes a rectifier unit, an inverter unit, a switch, and a capacitor, allowing the circuit to switch between series and parallel modes, enabling the rectifier unit to function as a standby inverter unit, thereby utilizing the idle rectifier unit to drive loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frequency converter is modified from AC input to DC power supply by switching on the rectifier unit, then the converter can drive motors with DC power supply, but the rectifier unit cannot effectively function and becomes idle
Solution Approach 1:
The patent makes the rectifier unit multi-functional by enabling it to operate in two modes: (1) as a rectifier converting AC to DC when the first switch is on, and (2) as a standby inverter converting DC to AC when the first switch is off. This allows the same hardware to serve dual purposes, eliminating the idle state and improving overall system versatility without requiring additional components.
Solution Approach 2:
The patent introduces dynamic switching capability where the rectifier unit can transition between different operational states based on the switching state of the first switch. The unit dynamically changes its function from rectification to inversion, optimizing resource utilization and ensuring that no component remains idle, thereby resolving the manufacturing efficiency issue.
2Device complexity
If a single inverter unit is used to drive the load, then the circuit structure is simple, but the system reliability is low when the inverter unit malfunctions
Solution Approach 1:
The patent implements a standby inverter mechanism where the rectifier unit is pre-configured to function as a backup inverter. When the primary inverter unit malfunctions, the system can switch to the standby configuration without requiring additional external backup equipment. This beforehand preparation ensures continuous operation and improves reliability while maintaining relatively simple circuit structure.
Solution Approach 2:
The patent changes the operational parameters and configuration of the rectifier unit based on system needs. By controlling the switching state, the system can transition between single-inverter mode (simpler operation) and dual-inverter standby mode (higher reliability). This parameter-based control allows the system to adapt its complexity and reliability level dynamically.
3Productivity
If the rectifier unit is left idle after AC to DC conversion, then the conversion function is achieved, but the rectifier unit cannot be utilized to drive loads
Solution Approach 1:
The patent enables the rectifier unit to serve itself by making it capable of functioning as a standby inverter. Instead of requiring a separate dedicated backup inverter, the system uses the rectifier unit's own capability to provide backup inversion functionality. This self-service approach maximizes productivity by ensuring both units are utilized and improves versatility by enabling the rectifier to perform dual functions.
Data Source
AI summary
The present disclosure relates to a driving circuit and method, a frequency converter, a device and a computer readable storage medium. The circuit includes: a rectifier unit including a first input terminal, a second input terminal and an output terminal, wherein the output terminal of the rectifier unit is connected to an input terminal of the inverter unit, and the second input terminal of the rectifier unit is connected to the input terminal of the inverter unit a first switch arranged between the first input terminal of the rectifier unit and an output terminal of the inverter unit, and configured to control the driving circuit to switch between a series mode and a parallel mode by being switched on or off; the inverter unit with the output terminal connected to a load; and a capacitor connected in parallel between the rectifier unit and the inverter unit.