Class / Patent application number | Description | Number of patent applications / Date published |
327078000 | Reference level crossover detecting | 24 |
20080272809 | Integrated circuit power-on control and programmable comparator - An integrated circuit is provided with a main supply rail and a virtual supply rail connected by strong and weak header transistors. A power-on controller controls the switching on of the strong transistors after the virtual supply rail voltage has already been driven up to close to its operating level by the weak transistor. The power-on controller comprises a comparator monitoring a single reference voltage level with its output being latched within a latch and used to switch on the strong transistor. The comparator may be programmable to detect multiple different trigger voltage levels by using opposing charging and discharging transistors with one set of these operating in a saturated regime and the other in a regime in which the current therethrough varies in dependence upon the voltage being sensed. These opposing transistors can be used to charge or discharge a node with the state of that node being taken to generate the sensed output. | 11-06-2008 |
20100207666 | Comparator circuit - A comparator circuit, includes first and second terminals to which a reference voltage that determines a threshold voltage is inputted, a third terminal to which a standard voltage is inputted, a fourth terminal to which a target voltage that is to be detected and is based on the standard voltage is inputted, first and second transistors of a first conductivity type including control terminals to the first and second terminals, respectively, the first and second transistors flowing currents depending on a potential difference of the reference voltage, a third transistor of a second conductivity type connected between the first transistor and the fourth terminal, and a fourth transistor of the second conductivity type connected between the second transistor and the third terminal, the fourth transistor flowing a mirror current depending on a current passing through the third transistor. A voltage depending on a voltage of an intermediate node between the second and fourth transistors is outputted as an output signal. | 08-19-2010 |
20120105108 | BROWN-OUT DETECTION CIRCUIT - A data processing system ( | 05-03-2012 |
20140062535 | Power-on Reset Circuit - A power-on reset circuit is disclosed. The power-on reset circuit includes a first resistor; a first transistor, including a first terminal coupled to a second terminal of the first resistor, and a control terminal for receiving a reference voltage; a second resistor, including a first terminal coupled to a second terminal of the first transistor; a second transistor, including a first terminal coupled to a second terminal of the first resistor, and a control terminal coupled to a second terminal of the second transistor and utilized for receiving an input voltage; and a comparator, including a first input terminal for receiving a comparison voltage, and a second input terminal for receiving the reference voltage, for generating a power-on reset signal according to the comparison voltage and the reference voltage. | 03-06-2014 |
20140084961 | Method and Apparatus for Analog Pulse Pile-Up Rejection - A method and apparatus for pulse pile-up rejection are disclosed. The apparatus comprises a delay value application constituent configured to receive a threshold-crossing time value, and provide an adjustable value according to a delay value and the threshold-crossing time value; and a comparison constituent configured to receive a peak-occurrence time value and the adjustable value, compare the peak-occurrence time value with the adjustable value, indicate pulse acceptance if the peak-occurrence time value is less than or equal to the adjustable value, and indicate pulse rejection if the peak-occurrence time value is greater than the adjustable value. | 03-27-2014 |
20140145762 | POWER SUPPLY SENSING CIRCUITS IN INTEGRATED CIRCUITS - Integrated Circuits (ICs) comprising circuits configured to generate a power on reset (POR) pulse are disclosed. An IC comprises a power supply sense circuit configured to generate a sense signal in response to a transition of a power supply signal from a first level to a second level, and a pulse generation circuit coupled with the power supply sense circuit. The pulse generation circuit is configured to generate a power on reset (POR) pulse of a threshold duration based on the sense signal. The IC further includes a reset generation circuit coupled with the pulse generation circuit to receive the POR pulse. The reset generation circuit is configured to generate a reset pulse based on the POR signal and of at least one control signal, where the reset pulse is configured to be utilized to perform a reset of one or more elements of the integrated circuit. | 05-29-2014 |
20150022242 | Clock edge detection device and method - The present invention discloses a clock edge detection device capable of detecting the positive and negative edges of a target clock, comprising: a delay circuit for receiving the target clock and transmitting it; a register circuit coupled to the delay circuit for recording and outputting plural target clock levels in accordance with a working clock; a positive edge detection circuit including a plurality of positive edge detectors coupled to the register circuit for detecting the positive edge of the target clock; and a negative edge detection circuit including a plurality of negative edge detectors coupled to the register circuit for detecting the negative edge of the target clock, wherein the positive edge detection circuit is operable to perform a logic operation to the target clock levels while the negative edge detection circuit is operable to perform a different logic operation to the target clock levels. | 01-22-2015 |
20150130512 | Encoder - An encoder is configured for detection of rotational movement of a rotatable shaft in relation to a part of a machine, and a method is provided for generating a reference signal by an encoder. | 05-14-2015 |
20160204772 | POWER DROP DETECTOR CIRCUIT AND OPERATING METHOD OF SAME | 07-14-2016 |
327079000 | Zero crossover | 15 |
20080303556 | POWER SUPPLY GROUND CROSSING DETECTION CIRCUIT - A detecting circuit for detecting an input signal crossing a ground level is disclosed. The circuit comprises two PMOS transistors and two NMOS transistors connected, respectively. The PMOS transistors have source terminals connected to a power voltage, the gate terminals connected together and the drain terminal of the second PMOS transistors. The first NMOS transistor has the source terminal as an input terminal to retrieve an input signal, and the drain terminal to be act as output terminal and the second NMOS transistor has the source terminal grounded. The gate terminals of the two NMOS transistors are connected together and to a biased voltage. The circuit can also be used to detect the power voltage if the input terminal is set at the source terminal of the first PMOS transistor and the source terminal of the first NMOS transistor grounded. | 12-11-2008 |
20080309379 | Zero crossing circuit - An improved zero crossing circuit includes a signal output circuit element for registering a sharply defined signal, and in one embodiment an isolation circuit element cooperating with the signal output element, and a delay-inducing circuit element cooperating with the signal output element for applying a substantially constant time delay to the signal. In particular, the delay-inducing element includes a switch circuit and a delay circuit. The switch circuit commences the time delay by the delay circuit upon a triggering voltage being reached. The time delay circuit is adapted so that the time delay equates to a time period required for the triggering voltage to change to zero so as to cross zero voltage substantially as the time delay expires. | 12-18-2008 |
20100045346 | ZERO-CROSSING DETECTING DEVICE AND IMAGE FORMING DEVICE - A zero-crossing detecting device that detects a zero-crossing point of AC voltage, the device has a full-wave rectifier that rectifies the AC voltage and outputs a full-wave rectified voltage, a charger that is charged at a predetermined charging voltage by application of the full-wave rectified voltage, wherein the charger outputs a charging current when the full-wave rectified voltage falls below the charging voltage, and a signal output part that outputs a zero-crossing detecting signal. The signal output part outputs the zero-crossing detecting signal when the charging current flows to the signal output part. | 02-25-2010 |
20100109709 | CIRCUIT ARRANGEMENT FOR IDENTIFYING NETWORK ZERO CROSSINGS - A circuit arrangement for identifying network zero crossings of a network voltage of an alternating current network is provided. A measurement current generated by the network voltage is supplied to a zero crossing detector in order to produce a network zero crossing signal. A current sink is arranged between a live conductor and a neutral conductor of the alternating current network, the current sink allowing the path of a current value of the measurement current generated by the network voltage to be defined. | 05-06-2010 |
20110169531 | Methods and Systems for Detection of Zero Crossings in a Signal - Methods and systems for detection of zero crossings in a signal are described. For example, true zero crossings in an alternating voltage power source signal can be detected in the presence of noise pulses. The zero crossing detections are performed by establishing a value of a signal status counter, and at a repeating interval if the signal is a logic low value, the value of the signal status counter is decremented if the signal status counter is greater than a first value otherwise a flag is set to enable detection of a zero crossing in the signal. In addition, at the repeating interval, if the signal is a logic high value, the value of the signal status counter is incremented, and if after incrementing the signal status counter is equal to a second value and the flag is set, a zero crossing of the signal is declared. | 07-14-2011 |
20120229170 | Methods and Systems for Detection of Zero Crossings in a Signal - Methods and systems for detection of zero crossings in a signal are described. For example, true zero crossings in an alternating voltage power source signal can be detected in the presence of noise pulses. The zero crossing detections are performed by establishing a value of a signal status counter, and at a repeating interval if the signal is a logic low value, the value of the signal status counter is decremented if the signal status counter is greater than a first value otherwise a flag is set to enable detection of a zero crossing in the signal. In addition, at the repeating interval, if the signal is a logic high value, the value of the signal status counter is incremented, and if after incrementing the signal status counter is equal to a second value and the flag is set, a zero crossing of the signal is declared. | 09-13-2012 |
20120286826 | Switching Power Converter Input Voltage Approximate Zero Crossing Determination - In at least one embodiment, the controller senses a leading edge, phase cut AC input voltage value to a switching power converter during a cycle of the AC input voltage. The controller senses the voltage value at a time prior to a zero crossing of the AC input voltage and utilizes the voltage value to determine the approximate zero crossing. In at least one embodiment, by determining an approximate zero crossing of the AC input voltage, the controller is unaffected by any disturbances of the dimmer that could otherwise make detecting the zero crossing problematic. In at least one embodiment, the controller approximates the AC input voltage using a function that estimates a waveform of the AC input voltage and determines the approximate zero crossing of the AC input voltage from the approximation of the AC input voltage. | 11-15-2012 |
20130082741 | Detection of the Zero Crossing of the Load Current in a Semiconductor Device - A circuit arrangement includes a reverse conducting transistor having a gate electrode and a load current path between an emitter and collector electrode. The transistor is configured to allow for conducting a load current in a forward direction and in a reverse direction through the load current path and activated or deactivated by a respective signal at the gate electrode. The circuit arrangement further includes a gate control unit and a monitoring unit. The gate control unit is connected to the gate electrode and configured to deactivate the transistor or prevent an activation of the transistor via the gate electrode when the transistor is in a reverse conducting state. The monitoring unit is configured to detect a sudden rise of a collector-emitter voltage of the reverse conducting transistor which occurs, when the load current crosses zero, while the transistor is deactivated or activation is prevented by the gate control unit. | 04-04-2013 |
20130106466 | HIGH VOLTAGE OFFSET DETECTION CIRCUIT | 05-02-2013 |
20130278293 | SYSTEMS AND METHODS FOR COMPENSATING THE INPUT OFFSET VOLTAGE OF A COMPARATOR - Systems and methods of actively compensating for the input offset voltage of a comparator are provided. A compensation circuit may include a compensation comparator for comparing the comparison signal generated using the output signal of a comparator, to a reference voltage. A first voltage accumulator is coupled to the compensation comparator and produces a first voltage that is related to a first amount of time that the comparison signal spends above the reference voltage. A second voltage accumulator is coupled to the compensation comparator, and produces a second voltage that is related to the second amount of time that the comparison signal spends below the reference voltage. The first voltage and/or the second voltage may be used to provide one or more compensation signals to one or more of the two input terminals of the comparator. | 10-24-2013 |
20130307586 | Zero-Crossing Detector for Industrial Control with Low Heat Dissipation - An I/O circuit for use with an industrial controller provides a zero-crossing detector circuit with low power dissipation through the use of a zero-crossing circuit that activates a light emitting diode of a photo coupler only for a very brief period of time at the zero-crossing (as opposed to at all times other than the zero-crossing). The circuit is coupled with a power supply circuit that uses a reactive element for voltage dropping as opposed to a resistive voltage drop element further reducing power consumption possible with the low power consumption of the photo coupler. | 11-21-2013 |
20140028354 | ZERO-CROSSING DETECTION METHOD AND CIRCUIT - Embodiments of the present invention disclose a zero-crossing detection method and circuit. The zero-crossing detection method includes: detecting a time point t0 when a mains voltage jumps from a low electrical level to a high electrical level and an adjacent time point t1 when the mains voltage jumps from a high electrical level to a low electrical level at a port of a detection end; and determining, according to the detected time points t0 and t1, a time point t when the mains voltage crosses zero. | 01-30-2014 |
20140118029 | HIGH VOLTAGE OFFSET DETECTION CIRCUIT - A high voltage half-bridge driver circuit has a high voltage terminal and a floating node to be connected with a high side switch therebetween. When turning on the high side switch, a high voltage offset detection circuit detects a voltage related to the voltage at the floating node for triggering a zero voltage switching signal. | 05-01-2014 |
20140176194 | ZERO CROSSING DETECTOR USING CURRENT MODE APPROACH - An apparatus includes a signal converter configured to convert a voltage signal into a current signal and an analog digital converter (ADC) configured to convert the current signal to a digital signal. The apparatus also includes a digital processor configured to process the digital signal and generate an output signal that indicates a zero crossing point of the mains voltage signal. | 06-26-2014 |
20160087619 | Zero-Crossing Voltage Detection Circuit and Method Thereof - A zero-crossing voltage detection circuit for detecting a phase voltage of a converter includes a comparator, a first transistor and a second transistor. The first transistor has a first base, a first collector and a first emitter. The first base couples with the first collector. The first emitter receives the phase voltage. The first collector provides a first voltage to a first terminal of the comparator. The second transistor has a second base, a second collector and a second emitter. The second base couples with the first base. The second base couples with the second collector. The second emitter receives a ground voltage. The second collector provides a second voltage to a second terminal of the comparator. The comparator compares the first voltage with the second voltage to generate a zero-crossing voltage signal. | 03-24-2016 |