| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 361910700 | Protection by snubber circuitry | 10 |
| 20080285196 | OVER-VOLTAGE INDICATOR AND RELATED CIRCUIT AND METHOD - Over-voltage indicator and related circuit and method. The over-voltage indicator can work with an I/O circuit of a chip for detecting over-voltage in an I/O pad and providing an indication signal accordingly. When over-voltage does not happen, the over-voltage indicator continues to detect a signal level of the I/O pad and keeps the indication signal low. Once over-voltage is detected, the over-voltage indicator pauses detecting, asserts a high level in the indication signal, and periodically resumes detecting until end of over-voltage is detected. With informing provided by the indication signal, a core cell of the chip can perform proper operation to reduce potential damage caused by over-voltage. | 11-20-2008 |
| 20080297964 | DRIVE DEVICE DRIVING A PLURALITY OF SEMICONDUCTOR ELEMENTS HAVING RESPECTIVE REFERENCE POTENTIAL ELECTRODES COUPLED VIA A MAIN ELECTRODE UNIT AND ALTERNATING CURRENT POWER SUPPLY DEVICE PROVIDED WITH THE DRIVE DEVICE - A first bypass circuit has first and second nodes. The first load circuit is connected between the first node and a signal input terminal of the second drive circuit. The second load circuit has substantially the same impedance as the first load circuit, and is connected between the second node and the reference potential terminal of the second drive circuit. The first drive circuit has the same reference potential as the input buffer. The second bypass circuit passes a signal of a predetermined frequency or higher between a current path formed between the first load circuit and the signal input terminal of the second drive circuit and a current path formed between the second load circuit and the reference potential terminal of the second drive circuit. The first bypass circuit passes a signal of a predetermined frequency or higher between the first and second nodes. | 12-04-2008 |
| 20090128973 | Power supply control circuit including overvoltage protection circuit - A protection ability of a power supply control circuit is improved so as to protect an output transistor against a back electromotive voltage from a load, a dump surge voltage, and a positive spike surge voltage which has a smaller energy but is higher than the dump surge voltage. The power supply control circuit includes: an output MOS transistor (power semiconductor device) connected between a first power supply terminal and an output terminal; a load connected to the output terminal; a first dynamic clamping circuit for controlling a voltage difference between a first power supply line and the output terminal; and a first switch connected between the first dynamic clamping circuit and the output MOS transistor, in which a conductive state is determined according to a result of comparison between a reference voltage and a voltage at the output terminal. The power supply control circuit further includes a second dynamic clamping circuit for controlling a voltage difference between the first power supply terminal and the output terminal to protect the output MOS transistor. The second dynamic clamping circuit operates in response to application of a positive spike surge voltage which is higher than the dump surge voltage. | 05-21-2009 |
| 20100259860 | Overvoltage protection circuit - An overvoltage protection circuit includes an output transistor coupled between a power supply and an output terminal, the output terminal including a terminal for being coupled to a load and a dynamic clamping circuit and a clamp selection transistor coupled in series between the power supply terminal and a control terminal of the output transistor. The clamp selection transistor is coupled between the dynamic clamping circuit and a control terminal of the output transistor. In addition, the clamp selector transistor includes an N-channel type transistor, a control terminal of the N-channel type transistor being coupled to a ground potential. | 10-14-2010 |
| 20120019970 | MATRIX CONVERTER - A matrix converter includes a plurality of semiconductor switch modules, and a plurality of snubber modules each having a plurality of capacitors and a plurality of diodes. Each of the snubber modules has a terminal group projecting outward, a first terminal, and a second terminal. The first and second terminals project from positions different from the terminal group, and are connected to an external circuit provided outside the matrix converter. Terminals of the terminal group are connected to terminals of a corresponding semiconductor switch module. The first terminals of the plurality of snubber modules are connected to one another via a first bus bar, and the second terminals are connected to one another via a second bus bar. | 01-26-2012 |
| 20130063853 | SNUBBER CIRCUIT AND METHOD OF USING BIPOLAR JUNCTION TRANSISTOR IN SNUBBER CIRCUIT - A snubber circuit includes: a capacitor including a first terminal and a second terminal, where the first terminal of the capacitor is electrically connected to a first terminal of the snubber circuit; and a Bipolar Junction Transistor (BJT), where one of the emitter and the collector of the BJT is electrically connected to the second terminal of the capacitor, and the other one of the emitter and the collector of the BJT is electrically connected to a second terminal of the snubber circuit. The snubber circuit can be electrically connected in parallel to an active component or a load to protect the circuitry connected to the load, and more particularly to absorb spike or noise generated during high-frequency switching of the active component to recycle energy, in order to achieve the goal of reducing spike voltages and enhancing efficiency. | 03-14-2013 |
| 20140240883 | OVER-LIMIT ELECTRICAL CONDITION PROTECTION CIRCUITS AND METHODS - Apparatuses and methods for protecting a circuit from an over-limit electrical condition are disclosed. One example apparatus includes a protection circuit coupled to a circuit to be protected. The circuit to be protected is coupled to a pad node. The protection circuit is configured to conduct current from the pad node to a reference voltage node to protect the circuit from an over-limit electrical condition. The protection circuit has a trigger circuit coupled to the pad node and configured to trigger a shunt circuit to conduct current from the pad node to the reference voltage node responsive to a voltage provided to the pad node having a voltage exceeding a trigger voltage. In some embodiments, the trigger circuit is matched to the circuit being protected. | 08-28-2014 |
| 20150036253 | Lossless Snubber Circuit And Operation Method Thereof - The present invention discloses a lossless snubber circuit and an operation method thereof. The lossless snubber circuit includes a first snubber circuit. The first snubber circuit includes a first diode (D | 02-05-2015 |
| 20150295489 | SEMICONDUCTOR DEVICE - A semiconductor device presented herein includes a first wiring including a first end and a second end configured to receive a voltage lower than a voltage of the first end. The semiconductor device includes a second wiring including a third end connected to the first end, and a fourth end connected to the second end. The semiconductor device includes a switching element set on the first wiring, a capacitor set on the second wiring, and a fuse portion set on the second wiring and positioned on a third end side of the capacitor. The semiconductor device includes a potential sensing portion connected to the second wiring between the fuse portion and the capacitor and configured to sense a potential of a connection point thereof. | 10-15-2015 |
| 20170237335 | POWER MODULE | 08-17-2017 |
