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| Number | Title | Issue Date |
| 8169204 | Active current limiting circuit and power regulator using the same The present invention mainly relates to a current limiting circuit, also known as over-current protection circuit, and a power regulator using the same. The purpose for the circuit is to protect the power device and the loading circuit for the power regulator. The c... | 05/01/2012 |
| 8143870 | Methods and apparatus for current sensing Methods and apparatus for current sensing according to various aspects of the present invention operate in conjunction with a current sensor adapted to sense the current provided to a load via a transistor. In one embodiment, a power supply includes the current sens... | 03/27/2012 |
| 8098058 | Circuit arrangement comprising a load transistor and a measuring transistor One aspect is a circuit arrangement having a load current path with a load transistor having a first and a second load path terminal and a control terminal. A first measurement current path includes a measuring transistor having a first and a second load path termin... | 01/17/2012 |
| 8004257 | Voltage regulator A voltage regulator has a first error amplifier circuit that amplifies a difference between a first reference voltage and a voltage based on an output voltage of an output transistor, and an overcurrent protection circuit that detects an overcurrent flowing through ... | 08/23/2011 |
| RE42307 | Thermally compensated current sensing of intrinsic power converter elements A DC-to-DC converter includes one or more power switches, a pulse width modulation circuit for generating control pulses for the power switches, and an output inductor connected to the power switches. A thermally compensated current sensor is connected to an intrins... | 04/26/2011 |
| 7923978 | Regulator circuit having over-current protection A stabilized regulator circuit is provided A first Pch transistor (PTr) (P1) whose source is connected to a power supply line and whose drain is connected to an output terminal that outputs a load current, a PTr (P2) whose source and gate are respectiv... | 04/12/2011 |
| 7855537 | Voltage supply circuit A voltage supply circuit includes an output transistor causing a first current to flow to an output terminal of the voltage supply circuit based on a control voltage applied from an error amplifier to a control terminal of the output transistor; and an overcurrent p... | 12/21/2010 |
| 7852054 | Low dropout regulator and the over current protection circuit thereof An over current protection circuit for low dropout regulator comprises a sense transistor, a sense resistor, an operational amplifier and a first transistor. The sense transistor senses the current flowing through the power transistor. The sense resistor is coupled ... | 12/14/2010 |
| 7816897 | Current limiting circuit An electronic circuit. The electronic circuit includes a pass transistor having a channel coupled between an input node and an output node. An error circuit is coupled thereto and configured to control the amount of current flowing through the pass transistor. The e... | 10/19/2010 |
| 7755337 | Current sensing circuit and voltage regulator using the same A current sensing circuit for sensing an output current generated by a voltage regulator includes a first double-diffused metal-oxide semiconductor transistor and a current-voltage converter. The first double-diffused metal-oxide semiconductor transistor has a first... | 07/13/2010 |
| 7705574 | Remote power controller with power sharing circuit A direct current (DC) remote power controller for remotely controlling DC power between a DC power source and a DC load, comprises: a current sensor for sensing the level of current that the power source supplies to the load and generating a current feedback signal ... | 04/27/2010 |
| 7701186 | Method and apparatus for reducing audio noise in a switching regulator A switching regulator utilizing on/off control that reduces audio noise at light loads by adjusting the current limit of the switching regulator. In one embodiment, a switching regulator includes a state machine that adjusts the current limit of the switching regula... | 04/20/2010 |
| 7701185 | Direct current stabilization power supply A direct current stabilization power supply apparatus, comprising: an output control device which generates a voltage corresponding to a drive current given and outputs it as an output voltage; a direct current stabilization portion which gives the drive current to ... | 04/20/2010 |
| 7683593 | Current sensing in a power converter In one embodiment, a power converter system includes a power device coupled between a first node and second node. The power device is operable to be turned on and off by a control signal. Current flows through the power device when the power device is turned on for ... | 03/23/2010 |
| 7635969 | Power supply unit and portable device A power supply unit is adapted to automatically switch its operational mode between a light load mode and a heavy load mode depending on the level of its output current. The unit has a first error amplification circuit for controlling a first output circuit in the h... | 12/22/2009 |
| 7602162 | Voltage regulator with over-current protection A linear regulator with an N-type pass transistor includes an over-current protection circuit. A current sink is used as an indicator for an over-current condition and is coupled to the output of the linear regulator. The indicator is coupled to a feedback logic cir... | 10/13/2009 |
| 7595615 | Systems and methods for providing over-current protection in a switching power supply A system and method is provided for providing integrated over-current protection in a switching power supply. In one embodiment, a switching power supply could comprise a gate drive circuit operative to receive a pulse-width modulated (PWM) signal and to drive at le... | 09/29/2009 |
| 7592790 | Start-up circuit with feedforward compensation for power converters A bleeding resistor is required to discharge EMI filter of the power converter for the safety purpose. In order to save power and reduce device count, the present invention further uses this bleeding resistor for both start-up and feedforward compensation. It includ... | 09/22/2009 |
| 7576526 | Overcurrent detection circuit A circuit for detecting overcurrent flowing to an output transistor. A replica transistor generates a reference voltage that is in accordance with a reference current flowing from a constant current circuit. A voltage-current conversion circuit generates a determina... | 08/18/2009 |
| 7521908 | Method and apparatus for reducing audio noise in a switching regulator A switching regulator utilizing on/off control that reduces audio noise at light loads by adjusting the current limit of the switching regulator. In one embodiment, a switching regulator includes a state machine that adjusts the current limit of the switching regula... | 04/21/2009 |
| 7432695 | Adaptive power control for hysteretic regulators A hysteretic regulator may be set to an active mode when voltage at an output falls to a first threshold level. In the active mode, charge is applied to an output node by a current having a set limit value. The regulator is set to an inactive mode when the voltage a... | 10/07/2008 |
| 7432758 | Voltage regulator for semiconductor memory A voltage regulator as a stable power supply to internal circuits in a semiconductor memory device is provided. This regulator includes a comparing unit, a first driver transistor, a feedback unit, an auxiliary control unit, a first switch, a second switch, and a se... | 10/07/2008 |
| 7411376 | Voltage regulator having overcurrent protection circuit and method manufacturing voltage regulator A voltage regulator has a sense transistor through which a sense current flows in accordance with a magnitude of a load current, and a sense resistor through which the sense current flows. A control transistor controls the load current in accordance with a voltage a... | 08/12/2008 |
| 7405547 | Stabilized DC power supply circuit having a current limiting circuit and a correction circuit A stabilized DC power supply circuit of the present invention includes an output current limiting circuit for limiting an output current of an output transistor, and a correction circuit for correcting variation of restriction in the output current caused by variati... | 07/29/2008 |
| 7403200 | Current sensing bi-directional switch and plasma display driver circuit A bi-directional switch comprising first and second semiconductor switching devices, a current sensor connected in series with the switching devices, thereby forming a series circuit, a driver circuit controlling the on/off operation of the first and second switchin... | 07/22/2008 |
| 7400122 | Method and apparatus for reducing audio noise in a switching regulator A switching regulator utilizing on/off control that reduces audio noise at light loads by adjusting the current limit of the switching regulator. In one embodiment, a switching regulator includes a state machine that adjusts the current limit of the switching regula... | 07/15/2008 |
| 7385380 | Switching power supply In a switching power supply apparatus for performing a switching control of a power MOS transistor that flows current to a coil and converting input voltage into output voltage, even if there occurs offset voltage in a current sensing operational amplifier, source p... | 06/10/2008 |
| 7375471 | Charging circuit A charging circuit has a battery 12, switching element 14, and resistor 16 for current detection arranged on the primary side of transformer 10. Diode 18 and capacitor 20 for storing electric power are arranged on the second... | 05/20/2008 |
| 7362080 | Power regulator having over-current protection circuit and method of providing over-current protection thereof A power regulator includes a pass transistor, a feedback circuit, an error amplifier and a protection circuit. The pass transistor receives an unregulated first power supply voltage, and an output terminal of the power regulator outputs an output voltage varying dep... | 04/22/2008 |
| 7358713 | Constant voltage source with output current limitation A constant voltage source is disclosed having an output current control element, which adjusts an output voltage of the constant voltage source by varying its output current, a control circuit, which acquires a measure for an actual value of the output voltage and p... | 04/15/2008 |
| 7358710 | Temperature-compensated inductor DCR dynamic current sensing A resister network having a negative temperature coefficient (NTC) may be utilized to create a temperature compensated equivalent resistance “R” for a current sensing RC network used in measuring inductor current of a DC-to-DC converter or a general switching re... | 04/15/2008 |
| 7356588 | Circuits and methods for detecting the presence of a powered device in a powered network Circuits and methods for detecting the presence of a powered device in a powered network connection and removing power from the powered network connection when no powered device is present are disclosed. The circuits and methods involve applying a time-varying volta... | 04/08/2008 |
| 7355372 | Power control system capable of balancing output currents A power control system includes a voltage control circuit and a plurality of balance circuits. The voltage control circuit controls a voltage level at an output of the power control system according to a reference voltage. Each of the plurality of balancing circuits... | 04/08/2008 |
| 7342384 | Switching regulator In a switching regulator circuit having a function of bypassing a power supply and an output terminal, there is provided a switching regulator that obtains a stable output voltage even if the operation of the bypass function is changed over. A reference voltage that... | 03/11/2008 |
| 7336085 | Current sensing circuit A circuit arrangement for detecting a load current through a load includes a main transistor, a sensing transistor through which a load current flows that is a measure of the load current flowing through the main transistor. In addition, a resistance is connected in... | 02/26/2008 |
| 7336464 | Power limiting circuit A power limiting circuit is disclosed. The power limiting circuit includes a temperature sensing circuit that outputs a temperature signal that is proportional to temperature over a temperature range. The power limiting circuit also includes a regulation circuit cou... | 02/26/2008 |
| 7327125 | Power supply circuit having voltage control loop and current control loop A power supply circuit includes two pass transistors that conduct current from a voltage supply terminal to an output terminal. One of the pass transistors is smaller whereas the other is larger. Current through the smaller transistor is controlled by the voltage co... | 02/05/2008 |
| 7323854 | Zero cancellation in multiloop regulator control scheme Control loops in a voltage regulator can be stabilized using minimal silicon area. A current limit signal, generated by a current limit control loop in the voltage regulator, can be divided to minimize a zero provided in a compensation set associated with a voltage ... | 01/29/2008 |
| 7323853 | Low drop-out voltage regulator with common-mode feedback The present invention is a LDO voltage regulator circuit with common-mode feedback. The LDO voltage regulator includes an error amplifier with a common-mode feedback unit, a pass device and a compensation circuit. A signal from the pass device acts as an input signa... | 01/29/2008 |
| 7315153 | Switching power supply in an integrated circuit having a comparator with two threshold values, a synchronization input and output, voltage feedback and efficient current sensing A switching power supply circuit in which a series circuit comprising a resistive element and a capacitive element is provided in a parallel configuration with an inductor which supplies a load current to a load circuit, a voltage comparator having first and second ... | 01/01/2008 |
