The present invention relates to a heating device for a motor vehicle with a dual-voltage vehicle electrical system. The heating device is operated with a power supply from the sub-system with the higher nominal voltage (for example 48 V), but actuated by a control device in the sub-system with the lower nominal voltage (for example 12 V). For this purpose, the heating device has a supply connection in the sub-system with the higher nominal voltage and a control connection in the sub-system with the lower nominal voltage. The control connection is disposed in particular on a control device which is integrated into the heating device and which is connected to a control connection of a switching element (power semiconductor) for controlling the heating device via a capacitive separating element in order to ensure potential isolation of the two sub-systems.

An interlock system for signaling a nurse call patient station is disclosed. The interlock system may include a first terminal and a second terminal. The first and second terminals may be configured to be connected to corresponding terminals of a signaling loop of a nurse call patient station. The interlock system may further include a connection circuit. The connection circuit may be configured to electrically connect the first terminal to the second terminal. The interlock system may also include a control circuit in communication with, but isolated from, the connection circuit. The control circuit may include a microcontroller. The control circuit may be isolated from the connection circuit by an isolation circuit. The control circuit may be configured to operate the connection circuit to connect or disconnect the first terminal from the second terminal.

A digital input circuit adopts a first state when an input signal is below a lower threshold value and adopts a second state when the input signal is above an upper threshold value. The digital input circuit comprises first and second subcircuits that exhibit a non-ideal current output behavior at least in the second state, and each comprises a current stabilizing element with a driving circuit and a voltage stabilizing element. The first and second subcircuits are configured such that, at least in a portion of the second state, an electric current flowing through the first subcircuit's voltage stabilizing element consists substantially of a stabilized current of the second subcircuit, and an electric current that flows through the second subcircuit's voltage stabilizing element consists substantially of a stabilized current of the first subcircuit, such that the non-ideal current output behavior of the first and second subcircuits compensate for each other.

An interlock system for signaling a nurse call patient station is disclosed. The interlock system may include a first terminal and a second terminal. The first and second terminals may be configured to be connected to corresponding terminals of a signaling loop of a nurse call patient station. The interlock system may further include a connection circuit. The connection circuit may be configured to electrically connect the first terminal to the second terminal. The interlock system may also include a control circuit in communication with, but isolated from, the connection circuit. The control circuit may include a microcontroller. The control circuit may be isolated from the connection circuit by an isolation circuit. The control circuit may be configured to operate the connection circuit to connect or disconnect the first terminal from the second terminal.

The induction memory cell includes an electronic circuit that can control internally the on or off state of a magnetic field within a magnetic induction circuit. The induction memory cell can control external devices. When the induction memory cell is used in an array it can be programmed to retain binary information such as on as a binary digit of one or off as a binary digit of zero. The induction memory cell on or off state can be controlled via a one second burst of laser light, aim at one photo resistor for controlling the magnetic field on state in the primary coil or another photo resistor controlling the magnetic field off state in the primary coil. The induction memory cell requires a 1.5 volt, 5 amp power source in order to maintain an on or off switching effect in the primary coil.

The induction memory cell includes an electronic circuit that can control internally the on or off state of a magnetic field within a magnetic induction circuit. The induction memory cell can control external devices. When the induction memory cell is used in an array it can be programmed to retain binary information such as on as a binary digit of one or off as a binary digit of zero. The induction memory cell on or off state can be controlled via a one second burst of laser light, aim at one photo resistor for controlling the magnetic field on state in the primary coil or another photo resistor controlling the magnetic field off state in the primary coil. The induction memory cell requires a 1.5 volt, 5 amp power source in order to maintain an on or off switching effect in the primary coil.

A phase loss detection device, a compressor including the same, and a phase loss detection method are disclosed. The phase loss detection device may include a signal converting circuit and a processor. The signal converting circuit is configured to convert voltage signals corresponding to respective phases of multiphase alternating current (AC) power monitored from a motor. The processor is configured to receive the converted voltage signals from the signal converting circuit, and configured to calculate, based on the converted voltage signals, one or more phase angles between the respective voltage signals. The processor is configured to determine that phase loss occurs if any one or more of the calculated phase angles deviate from a nominal value of a corresponding phase angle of the multiphase AC power by a value higher than a predetermined threshold. The phase loss detection can be performed in a convenient, effective and reliable way.

A device including an optoelectric circuit that is configured to provide galvanic isolation between a first circuit and a second circuit is disclosed. The optoelectric circuit includes at least one non-inverting buffer and a metal semiconductor diode. The at least one non-inverting buffer is positioned between a collector of a phototransistor and an anode of a light emitting diode. The metal semiconductor diode is positioned between the collector of the phototransistor and the at least one non-inverting buffer.

A power converter includes: a power converter main circuit that includes semiconductor switching elements; gate drive circuits driving the semiconductor switching elements, respectively; and one or a plurality of impedance element groups connected between at least one pair of the gate drive circuits. At least one of the gate drive circuits includes a detector that detects a voltage across the impedance element group, and changes the driving speed of the semiconductor switching elements in accordance with an output of the detector.

The induction memory cell includes an electronic circuit that can internally control the on or off state of a magnetic field within a wireless power transmission circuit. The induction memory cell can control external devices. When the induction memory cell is used in an array it can be programmed to retain binary information such as on as a binary digit of one or off as a binary digit of zero. The induction memory cell on or off state can be controlled via a brief emission of laser light, wireless induction from another induction memory cell or mechanical switch. Each photo resistor for controlling the on or off state is enclosed in a short tube with one opening for each tube that restricts some ambient light but also allows laser light to reach each photo resistor.