A controller for refrigerators compressors and a control method for such controller
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing compressor protection systems are expensive, mechanically complex, and require specific sizing for each type, leading to high production costs and logistical complexity, while active protections fail to prevent overheating and damage effectively.
Innovation Solution
A controller device with a control element that measures and monitors electrical parameters, using semiconductor switching means to manage current flow to windings, and a safety relay to prevent overheating by comparing current values to initial thresholds, ensuring continuous adaptive protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amperometric control devices (OLP or fuses) are used to protect compressor motors, then motor protection against overheating is provided, but the devices are expensive, mechanically complex with moving parts, and require specific sizing for each compressor type
Solution Approach 1:
The patent replaces mechanical amperometric control devices (OLP or fuses with moving parts) with an electronic control circuit that uses a microcontroller to monitor motor current and control the power transistor gating signals. This electronic system eliminates mechanical components while providing more precise and adaptive protection against overheating and abnormal operating conditions.
Solution Approach 2:
The patent implements a universal control circuit that can be applied to different compressor types without requiring specific sizing for each model. The microcontroller-based system adapts to various motor characteristics through software configuration rather than hardware redesign, enabling one circuit design to serve multiple compressor applications.
2Reliability
If amperometric control devices are used, then motor protection is achieved, but production costs and logistical complexity increase due to need for specific sizing
Solution Approach 1:
The patent implements a universal control circuit that can be applied to different compressor types without requiring specific sizing for each model. The microcontroller-based system adapts to various motor characteristics through software configuration rather than hardware redesign, enabling one circuit design to serve multiple compressor applications.
Solution Approach 2:
The patent uses software-based parameter adjustment in the microcontroller to adapt the control circuit to different compressor and motor specifications. By changing software parameters rather than physical components, the same hardware design can be manufactured universally and then configured for specific applications, greatly simplifying production and logistics.
3Ease of operation
If PTC thermistors are used for starting winding control, then the starting phase is managed, but the devices are passive and cannot provide comprehensive motor protection
Solution Approach 1:
The patent replaces passive PTC thermistor-based starting control with an active electronic control system using a microcontroller and power transistor. This active system not only manages the starting phase by controlling power delivery but also continuously monitors motor operation to detect abnormal conditions, providing comprehensive protection that passive thermistors cannot achieve.
Solution Approach 2:
The patent implements continuous feedback monitoring of motor current and operating conditions through the microcontroller. The system actively adjusts power delivery based on real-time measurements and can detect abnormal conditions such as locked rotor or overheating, providing intelligent control and protection that goes beyond the simple thermal response of passive PTC thermistors.
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 provides universal, proactive protection against overheating, reducing the risk of damage by interrupting power supply before dangerous conditions occur, thus enhancing safety and reducing production complexity and costs.
Implementation Method 1
a control element, which can be activated on a motor of a compressor to regulate the starting and running
Implementation Method 2
semiconductor switching means to manage current flow to windings
Implementation Method 3
a safety relay to prevent overheating by comparing current values to initial thresholds
Data Source
Figure 1
AI summary
A controller device comprising a control element, switching means, and a safety means operable by the control element to open or close a motor supply circuit; the control element is adapted to close the safety means, perform a control element operation check, supply a motor winding, store initial operating electrical parameters of said motor, and monitor a current value of the operating electrical parameters.