Switching Device with Separate Relay Housing for Silent Operation

The patent employs periodic pulsed control currents instead of continuous DC current to actuate the relay coil. The control circuit generates short-duration pulses that are sufficient to activate the relay switching mechanism, then allows the coil to rest and cool down. This periodic activation maintains switching functionality while dramatically reducing average power dissipation and self-heating in the coil.

The patent replaces the traditional electromagnetic coil-actuated mechanical relay mechanism with a solid-state electronic switching circuit. The control signal directly drives electronic switches (transistors or MOSFETs) that control the load circuit, eliminating the need for a continuous control current through an electromagnetic coil. This substitution removes the self-heating problem entirely while maintaining the ability to switch high-power loads with low-power control signals.

The patent replaces the electromagnetic relay mechanism that generates audible mains hum with a solid-state electronic switching circuit. The electronic switches are controlled by digital logic or microcontroller outputs that operate at frequencies beyond human hearing range, or use pulse-width modulation techniques that eliminate audible noise. This maintains full switching functionality while eliminating the harmful audible noise generated by traditional relay coils.

The control circuit uses periodic pulsed signals with frequencies optimized to avoid audible noise generation. By controlling the switching frequency to be either above the human hearing range (>20 kHz) or using variable frequency modulation, the patent eliminates the characteristic 50/60 Hz mains hum that plagues traditional relays while maintaining effective load switching capability.

The patent employs a universal solid-state electronic switching architecture that can operate across various electrical environments without requiring magnetic circuit fine-tuning. The electronic switching components and control circuitry are designed to accommodate different voltage levels, frequencies, and environmental conditions, providing consistent performance across diverse applications without the need for environment-specific adjustments.

The control circuit incorporates adjustable parameters such as pulse width, frequency, and amplitude that can be modified to optimize performance for different electrical environments. This allows the same basic circuit design to adapt to varying operational conditions by changing control parameters rather than requiring physical modifications to magnetic circuits, thereby achieving both precision and environmental versatility.