Multitech Medical Devices USA LLC

Other

Weiss Controls, Inc.

Lenny Novikov

John William Weiss

Igor Pinkusevich

A safety circuit to disrupt power to a heating element of an appliance to be powered through a solid state switch (Tri-ac, Q), typically a triac, from an AC power source (V) having a positive half cycle and a negative half cycle delivering power. A low resistance condition is sensed by detecting either the current through or voltage across the solid state switch during the positive half cycle and the negative half cycle of the AC power line, when the solid state AC switch is not actuated. A fault signal is generated to interrupt power to the heating element, preferably by a crowbar circuit opening a fuse, whenever the low resistance condition is detected.

Bipolar triac short detection and safety circuit

Disclosed is a temperature control and safety circuit for detecting the temperature of a PTC heating element and the status of a solid state switch powered by an AC power source in both a positive and a negative power voltage half cycle. The AC-powered solid state switch, e.g., a triac, is provided in series with a current sense resistor, the voltage drop across the resistor being proportional to current through the PTC heating element. A voltage shifting circuit is also provided for rendering a positive voltage to an analog to digital converter during both a positive and a negative half cycle. Preferably, the voltage input to the analog to digital converter controls, at least in part, the temperature of the PTC heating element and the status of the AC-powered solid state switch during both of the positive and negative half cycles.

Bi-polar triac short detection and safety circuit

Disclosed is a safety circuit for disrupting power to a heating element of an appliance to be powered through a solid state switch (Q), typically a triac, from an AC power source (V) having a positive half cycle and a negative half cycle for delivering power. A low resistance condition is sensed by detecting either the current through, or voltage across, the solid state switch during the positive half cycle and the negative half cycle of the AC power line, when the solid state AC switch is not actuated. A fault signal is generated to interrupt power to the heating element, preferably by a crowbar circuit opening a fuse, whenever the low resistance condition is detected.

Methods and system for controlling a heater conductor in a heating element including a sensor conductor separated from the heater conductor by an NTC layer. The heating element is coupled to a control circuit and the flow of electricity from a direct current source through the circuit is controlled such that a change of the resistance of the NTC layer is indicative of the temperature of the heater conductor. This resistance is detected based on a time or amplitude analysis and based thereon, a heating mode of the heater conductor is controlled. In a variation, the circuit is operated in a two-period measurement mode wherein the energy transferred through the NTC layer in one period is equal and opposite to the energy transferred through the NTC layer in the other period.

Method and system for controlling a heating element with temperature sensitive conductive layer

Electric vehicle recharging system in public garages and parking facilities that utilizes a vehicle identification to prevent energy theft and to provide a reliable and safe method to resume recharging process without any manual authorization after recharging interrupt.

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Cliffside Park, NJ, United States of America

Lenny Novikov