Compressor driving device, compressor pressure protection method, and air conditioner
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Solution Overview
Problem
The existing air conditioning systems lack effective mechanisms to ensure safe and reliable operation of compressors during abnormal pressure conditions, such as overpressure, which can lead to system damage if the compressor fails to timely stop operating.
Innovation Solution
A compressor driving device with a pressure switch and driving control circuit that disconnects the power supply when pressure exceeds a preset threshold, using a relay module and rectifier circuit to convert AC to DC for controlling the compressor's operation, and includes features for detecting voltage drops and relay module malfunctions to ensure safe shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure switch is added to disconnect power when pressure exceeds threshold, then compressor safety is improved, but device complexity increases
Solution Approach 1:
The pressure switch is pre-configured with a preset pressure threshold before system operation. When the system pressure reaches this predetermined threshold, the pressure switch automatically disconnects the relay module power supply, preventing overpressure damage without requiring real-time monitoring or complex control algorithms.
Solution Approach 2:
The pressure switch acts as an intermediary safety device between the refrigerating system pressure and the compressor power supply. It monitors system pressure and mediates by disconnecting the relay module power supply when pressure exceeds the threshold, thereby protecting the compressor from overpressure conditions.
2Reliability
If voltage detection is added to detect direct current bus voltage drops, then compressor protection reliability is improved, but device complexity increases
Solution Approach 1:
The driving control circuit continuously detects the voltage of the direct current bus and uses this feedback information to monitor system state. When voltage drops to a first preset voltage value during compressor operation, the circuit automatically controls the compressor to stop working, preventing damage from undervoltage conditions.
3Reliability
If malfunction detection timing is added to determine relay module failures, then system reliability is improved, but device complexity increases
Solution Approach 1:
The driving control circuit starts timing when the pressure switch disconnects power, creating a predetermined time window for voltage detection. After this preset time has been reached, the circuit detects whether voltage on the direct current bus remains above a second preset voltage value, thereby determining relay module malfunction without requiring complex diagnostic algorithms.
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 ensures the compressor safely and reliably stops during abnormal pressure conditions, preventing system damage and ensuring continuous safe operation by disconnecting power when necessary and detecting potential relay failures.
Implementation Method 1
The rectifier circuit is configured to convert connected alternating current into direct current and then output the direct current to a direct current bus
Data Source
AI summary
A compressor driving device includes a three-phase alternating current power supply input end, a relay module, a rectifier circuit, and a driving control circuit which are sequentially connected; the rectifier circuit is used for converting connected alternating current into direct current and then outputting the direct current to a direct current bus; the driving control circuit is used for converting the direct current output by the direct current bus into compressor driving power; a pressure switch is used for measuring the pressure value in a refrigerating system, and when the measured pressure value is larger than a preset pressure threshold, disconnecting the power supply circuit of the relay module; the driving control circuit is also used for detecting the on-off state of the pressure switch and controlling the compressor to stop working when the pressure switch is switched off.