Reduce Electromagnetic Interference in HVAC Compressors

Refrigerant circuit module that reduces electromagnetic compatibility (EMC) degradation through a novel housing design. The module features a first housing with a separate space for the motor, a second housing with a distinct outer wall surface, and a connection portion that maintains electrical isolation between the housing surfaces. The design prevents electrical noise from the motor's electrical path from flowing into the housing's electrical path, thereby protecting the module's EMC characteristics.

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An electric compressor EMC noise removal control system and method that prevents electromagnetic interference (EMI) between the low-voltage power supply and high-voltage input units. The system employs a high-voltage isolation network that separates the high-voltage power supply and high-voltage input units from the low-voltage power supply and high-voltage input units. This isolation network prevents the low-voltage power supply from inadvertently generating EMI when both power supply and input units are powered on simultaneously. The isolation network is integrated into the control system architecture, ensuring that the high-voltage input units receive their power from the high-voltage conversion unit while the low-voltage power supply remains isolated.

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Anti-interference compressor motor with improved protection against electromagnetic interference (EMI). The motor features a mounting base with a fixed anti-interference protection frame that slides within a central mounting groove. This design enables the frame to be disassembled for maintenance while maintaining motor functionality. The protection frame contains a set of spring-loaded mounting blocks that secure the motor base to the mounting base, ensuring precise alignment during disassembly. The spring-loaded blocks are connected to the installation grooves, while the opposing clamping rods secure the mounting plates to the motor base. This configuration enables the motor to be easily disassembled while maintaining its motor functionality, making it particularly suitable for high-reliability applications where EMI protection is critical.

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A quiet low ambient temperature air source heat pump unit comprising a sound-absorbing partition separating the first working room from the second working room. The first working room contains a finned heat exchanger, a silent fan, and side noise reduction plates. The second working room houses the compressor, shell-and-tube heat exchanger, electric control box, liquid receiver, gas-liquid separator, plate heat exchanger, dry filter, and system pipelines. The second working room is surrounded by sealing and noise reduction plates.

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A shielding system for refrigeration equipment control boxes that addresses both electromagnetic compatibility (EMC) and heat management issues. The system features a shielding enclosure around each heating device, with a common coolant circuit for both shielding and heat dissipation. The enclosure includes a shielding shell with an integrated coolant system, where the coolant circulates through the enclosure's walls and ceiling. This design enables effective electromagnetic shielding while maintaining reliable heat dissipation through the common coolant circuit.

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A control system for ultra-low temperature air-source heat pumps that reduces noise generated by the compressor and fan. The system incorporates a unique fan configuration that uses a single fan to drive multiple fans, with variable frequency operation. The system also employs a sealed and silenced compressor design, along with advanced oil management and protection features. The control system achieves noise reduction of 83 dB compared to conventional heat pumps, meeting the requirements for low-noise heating systems in residential and commercial applications.

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Air conditioner with integrated EMC filter module that eliminates electromagnetic interference (EMI) through a single, compact unit. The air conditioner includes an outdoor unit, an indoor unit, and an EMC filter module that combines a coil-based noise removal circuit with a substrate-based noise cancellation system. The coil-based circuit is wound on a substrate with multiple coil terminals, while the substrate itself features a noise cancellation circuit. The module's design enables the noise cancellation circuit to be integrated into the substrate, eliminating the need for separate EMC filters. The coil-based circuit is connected to the coil terminals of the substrate, while the substrate's noise cancellation circuit is connected to the coil terminals of the indoor unit and outdoor unit. This integrated design reduces PCB size and manufacturing cost while eliminating the need for separate EMC filters.

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A system for suppressing electromagnetic interference (EMI) in refrigerant radiators in household appliances. The system integrates a capacitor and resistor in series with the metal conductor to form a closed-loop EMI path. This EMI path is connected to the refrigerant radiator and power supply, effectively filtering electromagnetic radiation between the components. The capacitor and resistor circuitry provides a controlled path for electromagnetic radiation to dissipate, while maintaining the refrigerant flow. The system can be integrated into existing refrigerant radiator designs, reducing production costs and improving electromagnetic compatibility.

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An on-board motor-driven compressor that reduces common mode noise and normal mode noise that are included in the DC power. The compressor has an inverter device that drives the electric motor. The inverter device includes a noise reducing unit that reduces the noise. The noise reducing unit has a common mode choke coil and a damping unit. The common mode choke coil reduces the common mode noise. The damping unit reduces the normal mode noise. The damping unit is located at a position intersecting the magnetic path of the leakage magnetic flux generated from the common mode choke coil.

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Common mode interference suppression device, frequency conversion electrical appliance and common mode interference suppression method for fan motors in inverter-based appliances. The suppression method employs a magnetic coupling component that generates a magnetic field between the inverter bridge and the fan motor feeder. This magnetic coupling enhances the common mode loop impedance between the inverter bridge and the fan motor, thereby effectively suppressing common mode interference. The magnetic coupling component is integrated into the fan motor design without altering the existing filter structure or increasing filter components.

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A heat pump system that optimizes electromagnetic compatibility through electrical resonance frequency modification of its fluid guide sections. The system includes a heat pump with at least two separate fluid guide sections connected by an electrically conductive connection, enabling targeted resonance frequency adjustments to minimize electromagnetic interference. By strategically altering the resonance frequency of these sections, the system can significantly reduce electromagnetic emissions in areas where conventional methods fail to detect interference.

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A shielding cover for electric compressors that provides comprehensive electromagnetic compatibility protection. The cover incorporates a metal shielding network card that integrates with the compressor's wiring harness, creating a comprehensive electromagnetic shielding solution. The cover's design enables the shielding network card to automatically adjust its shielding effectiveness based on the operating conditions, ensuring optimal protection against electromagnetic interference. This innovative approach addresses the unique challenges of electric vehicle air conditioning compressors, particularly those with high-power requirements and complex control systems.

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Air conditioner that utilizes a specially designed refrigerant piping as an antenna to reduce noise interference. The system incorporates a unique piping configuration where the inter-unit refrigerant piping acts as a resonant antenna, with damping devices strategically placed to suppress noise current. The resonant frequency of the piping is selectively tuned to frequencies above the noise frequency range, preventing resonance-induced radiation noise. This approach eliminates the need for traditional noise-reducing components like magnetic materials or communication line antennas, while maintaining effective noise reduction performance.

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Motor driver and air conditioner that simultaneously reduces electromagnetic interference (EMI) noise when multiple motors are driven in parallel. The motor driver employs a novel control strategy where the inverter and motor are alternately used as reference and interlocking signals. This synchronized control enables the motors to cancel their common-mode noise through coordinated switching patterns, while maintaining reliable operation. The control unit dynamically adjusts the switching timing between the inverter and motor signals to optimize noise reduction.

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A shielding bracket for air conditioning compressors that provides effective electromagnetic interference (EMI) protection while maintaining precise PCB board alignment. The bracket is manufactured to precise dimensions, ensuring optimal shielding performance and robust installation. Its unique design enables precise positioning of components on the PCB board, eliminating stacking interference and ensuring reliable operation.

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Air conditioner with improved noise reduction through frequency-specific filtering. The system comprises two core components: a ground-blocking core that prevents noise from the power supply connection, and a high-frequency noise filter that captures and attenuates electromagnetic interference generated by the compressor and fan switching operations. The filter utilizes a combination of capacitors and resistors with specific frequency characteristics to effectively suppress noise in the 30-40 MHz frequency range, where electromagnetic interference is most prevalent.

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Common mode interference suppression device and frequency conversion electrical appliance to eliminate electromagnetic interference (EMI) in fan motors with frequency conversion or chopper control. The suppression is achieved through a magnetic ring or common mode choke that generates magnetic coupling between the fan motor feeder and compressor feeder, effectively increasing the common mode loop impedance and suppressing common mode interference.

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A noise reduction circuit for compressor electronic control assemblies that mitigates common-mode electromagnetic interference (EMI) issues associated with liquid storage tank heat dissipation solutions. The circuit integrates a low-impedance path for shunting common-mode currents from the radiator to the inverter, thereby preventing them from returning to the power supply terminal. This design solution addresses the EMI performance degradation typically associated with liquid tank heat dissipation technologies when connected to the compressor's electrical ground.

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Heat pump device that optimizes compressor operation through real-time monitoring and adaptive control. The device features a novel compressor housing that incorporates an integrated temperature sensor and advanced control system, enabling precise temperature control of the compressor inlet. This enables the compressor to operate within its optimal operating range, even at low outdoor temperatures, while maintaining efficient heat transfer. The device's innovative design eliminates the traditional delay in temperature measurement and control, allowing for more precise compressor operation and reduced noise levels.

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Electric compressor for vehicles that eliminates the need for rubber gaskets between the housing and cover. The compressor features a conductive metal cover that seals the inverter housing, with a conductive member that transmits electromagnetic noise from the inverter circuit to the housing. The cover and housing are fixed together by a conductive bolt, eliminating the need for a gasket. This design enables electromagnetic interference (EMI) shielding without compromising the sealing integrity of the housing and cover.

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