6 results about "Diode voltage" patented technology

This invention discloses an LLC resonant converter with a wide output voltage range based on a voltage doubler rectifier, applicable to DC fast charging of new energy vehicles. The converter achieves primary-side inversion and secondary-side rectification topology reconfiguration through switch drive signals, enabling wide-range voltage output in four operating modes. The primary side can switch between half-bridge and full-bridge inversion modes, while the secondary side can switch between full-bridge, voltage doubler, and voltage quadruple rectifier modes. This invention reduces diode voltage stress, possesses self-balancing capability of the voltage doubler capacitor, and achieves soft switching across the entire voltage range. Ultra-wide voltage gain is achieved within a narrow frequency adjustment range across the entire voltage range through simple pulse frequency modulation (PFM), allowing the converter to adapt to the charging needs of new energy vehicles with different voltage platforms.

This invention discloses an apparatus for measuring oxygen saturation. The apparatus includes a circuit system configured to: measure a first diode voltage at a light-emitting diode (LED) when a first current is applied through the LED; measure a second diode voltage at the LED when a second current is applied through the LED; and measure a third diode voltage at the LED when a third current is applied through the LED. The circuit system is further configured to: determine a series resistance based on the first, second, and third diode voltages; and determine the intensity of a received photon signal corresponding to an output photon signal generated using the LED. The circuit system is further configured to determine the oxygen saturation level based on the intensity of the received photon signal and the series resistance.

This invention belongs to the field of power electronic converter technology and discloses an automatic current-sharing high-gain boost converter and its application in photovoltaic charging devices. This automatic current-sharing high-gain boost converter employs two different voltage multiplier units, inserted at the midpoint of the bridge arm of a two-phase interleaved parallel circuit, and then cascaded with a half-wave rectifier circuit. This ensures that each inductor discharge circuit contains (m+n+1) diodes, thereby automatically achieving inductor current sharing. Furthermore, it achieves a voltage gain of 2(m+n+1) / (1-D) with a relatively small number of components, and features low switching transistor voltage stress, low diode voltage stress, low input current ripple, and common ground drive for all switching transistors. The boost requirements can be flexibly met by freely matching the number of switched capacitors n and m in the boost unit.

This application provides a short-circuit identification method for water pump frequency converters based on the IGBT body diode voltage drop slope, applied to the short-circuit protection system of a water pump frequency converter controller. The method includes: real-time capture of the collector-emitter forward voltage drop signal generated by the lower arm insulated gate bipolar transistor during the inductive load freewheeling phase; continuous discrete voltage sampling at a preset sampling frequency during the effective freewheeling period; obtaining the instantaneous voltage drop change rate between adjacent sampling points through digital differential logic; comparing the absolute value of the instantaneous voltage drop change rate with a preset critical slope threshold and a time window threshold to perform dual determination; and triggering a hardware logic blocking drive signal when a short-circuit fault is detected at the output terminal.

This invention belongs to the field of pressure measurement technology for large-cavity presses, and discloses a pressure calibration method for large-cavity presses based on diode constant current mode and a differential stress phase change pressure measurement method. The differential stress phase change pressure measurement method provided by this invention fixes two diodes to a second pressure-transmitting medium and the analyte, respectively. While performing an oil pressure test using a large-cavity press, a calibration current is applied to the two diodes. The voltage changes of the two diodes are compared to obtain a differential signal, and the abrupt change interval in the differential signal is identified. Based on the diode voltage signal used as a reference channel, combined with the "cavity pressure - diode voltage" standard curve, the cavity pressure range of the abrupt change interval is obtained. This invention eliminates the reliance on bulky sensing elements and additional structural characterization facilities, achieving simple, low-cost, in-situ, and continuous pressure monitoring during actual functional experiments, and also expands the range of measurement objects.

A bandgap reference circuit comprising: a proportional to absolute temperature, PTAT, voltage circuit configured to generate a PTAT voltage; and a bandgap voltage circuit comprising a diode, the bandgap voltage circuit configured to: receive the PTAT voltage from the PTAT voltage circuit; and combine the PTAT voltage with a diode voltage across the diode to output a bandgap reference voltage.