Resonant Voltage Driving Circuit for Inverter Bus Voltage Stability
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Solution Overview
Problem
Conventional voltage driving circuits experience unstable operation of the inverter when the power current exceeds a certain level, leading to a decrease in available voltage due to increased partial voltage of the internal electric reactor.
Innovation Solution
A voltage driving circuit and system that includes a resonant circuit capable of switching between resonant and non-resonant operation states, along with a control device that sends pulse width modulation signals to a switching device to boost the input voltage of the inverter by redirecting redundant energy from the resonant circuit to a thin film capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonance solution is used for frequency conversion driving, then reliable operation is ensured for low power, but available voltage decreases when power current exceeds certain level
Solution Approach 1:
The patent implements dynamic switching between resonant and non-resonant operation modes based on real-time detection of power current magnitude. When power current exceeds the preset threshold, the control device switches from resonant frequency conversion to non-resonant frequency conversion, thereby dynamically adapting the circuit characteristics to maintain stable inverter operation across varying power levels
Solution Approach 2:
The patent changes the operating parameters of the resonant circuit by switching between resonant and non-resonant states. This parameter change allows the circuit to operate optimally in different power ranges, preventing the voltage drop that occurs when using fixed resonant operation at high power currents
2Productivity
If power current increases, then driving capability is improved, but partial voltage of electric reactor increases causing inverter operation instability
Solution Approach 1:
The control device dynamically monitors the power current and switches the resonant circuit's operation state accordingly. When power current exceeds the preset threshold, the system transitions from resonant to non-resonant operation, dynamically adjusting the circuit characteristics to maintain inverter stability while preserving high driving capability
Solution Approach 2:
The resonant circuit acts as an intermediary between the power supply and the inverter. By switching its operation state, it mediates the relationship between high power current and inverter stability, filtering and regulating the energy transmission to prevent direct negative effects on the inverter operation
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 effectively raises the input voltage of the inverter, ensuring stable operation and reducing the likelihood of bus voltage drops that could affect the normal operation of connected loads.
Implementation Method 1
a resonant circuit 10 configured to be connected to a three-phase power supply, and enter a non-resonant operation state in a case where a working current of a load is greater than a preset current
Data Source
AI summary
The present application relates to a voltage driving circuit and system and a household appliance. The voltage driving circuit includes a diode; a thin film capacitor; a resonant circuit configured to be connected to a three-phase power supply and enter a non-resonant operating state in a case where a working current of a load is greater than a present current; a rectifier circuit, of which an input end is connected with the resonant circuit; a switch device, of which a first end is connected with a first output end of the rectifier circuit and an anode of the diode, a second end is connected with a second output end of the rectifier circuit and a first end of the thin film capacitor, wherein a cathode of the diode is connected with a second end of the thin film capacitor; an inverter circuit connected with the first end of the thin film capacitor and the second end of the thin film capacitor, and configured to be connected to the load; and a control device, connected with a control end of the switch device, the resonant circuit, and the inverter circuit.