Abstract: A switching device having a good isolation characteristic is disclosed. The switching device comprises a switch unit and a control unit, wherein the control unit is connected to a power supply terminal, and connected to the switch unit via a control line and a power line. The control unit comprises a voltage regulator unit that is electrically connected to the power supply terminal and the power line of the switch unit. When the switch unit enters standby mode, the control unit provides an isolation voltage to the switch unit to effectively enhance the isolation characteristic of the switching device in the standby mode.

Abstract: A display device includes a voltage supply unit to output a first voltage, a switch unit to selectively output the first voltage or a second voltage, a coupling member to transfer a third voltage to a display panel, and a feedback unit to selectively feed back the first voltage or the third voltage. The voltage supply unit receives a voltage based on the first voltage or the third voltage selected by the feedback unit, and the third voltage is based on the first voltage output from the switch unit. The voltage supply unit may compensate for drops in a control voltage of the display panel based on the fed back voltage.

Abstract: A constant-voltage circuit having an overcurrent protection circuit which includes: a first sense transistor, one main terminal connected to an input terminal of the constant-voltage circuit and a control terminal connected to a control terminal of an output transistor generates a current corresponding to an output current from the output transistor; a voltage level adjusting circuit configured to generate a voltage corresponding to a voltage of a main terminal of the output transistor at an output terminal side of the constant-voltage circuit by extracting a current that is not affected by a change in the output current from the output transistor, and adjust a voltage of another main terminal of the first sense transistor such that the adjusted voltage becomes equal to the generated voltage; and a protection circuit to control a control voltage applied from an error amplifier to the control terminal of the output transistor.

Abstract: A voltage regulator includes: a comparator configured to compare a feedback voltage with a reference voltage to output an enable signal and operate based on a bias current; a pass transistor turned on according to the enable signal and configured to output an external power voltage as an output voltage; a voltage distribution circuit configured to distribute and output the output voltage to an input terminal of the comparator; and a bias current control unit configured to control an amount of the bias current supplied to the comparator based on the output voltage.

Abstract: Provided is a voltage regulator that is low in current consumption and is capable of suppressing the occurrence of an excessive overshoot at an output terminal when a power supply voltage becomes high in a non-regulated state. The voltage regulator includes: an overshoot limiting circuit for detecting an occurrence of an overshoot in an output voltage and limiting a current of the output transistor; and a non-regulated state detection circuit for detecting a non-regulated state of the voltage regulator based on a voltage of an output terminal and a current flowing through the output transistor. The overshoot limiting circuit has an operating current controlled by a detection signal of the non-regulated state detection circuit.

Abstract: A switched-mode power supply device including a charger connected on one side to a direct current electrical network, or rectified alternating current electrical network, a power reserve connected to a second side of the charger, and DC-DC output converters delivering regulated output voltages. The output converters are connected by an input to the first side of the charger. The charger is a current bidirectional, voltage unidirectional converter which, in a first phase, enables the power reserve to be recharged and maintained charged from the network, where the output converters are powered by the network and, in a second phase, in the presence of a power brown-out of the network, enables the power reserve to be discharged to power the output converters. A reverse blocking module is connected to the first side of the charger to disconnect the charger and the output converters from the network during the second phase.

Abstract: A voltage regulator circuit and a method for operating the voltage regulator circuit are described. In one embodiment, a voltage regulator circuit includes an input terminal to receive an input signal from a power interface, an output terminal to output an output signal using the input signal, an output voltage monitor circuit configured to compare the voltage of the output signal with a predetermined voltage threshold, and a current limit circuit configured to limit current flowing on a path from the input terminal to the output terminal to a transient current limit level. The transient current limit level is lower than a predefined current limit threshold of the power interface. Other embodiments are also described.

Abstract: A power converter used in the current control circuit and control method, consisting of a converter, a voltage divider circuit, a current sampling circuit, a first gain circuit, a differential amplifier, a second gain circuit, a multiplier, a saw tooth wave generator, a modulation comparator, and a driver. The invention samples inductor current through the current sampling circuit and generates the current sense signal, then processes again. With the differential amplifier, it compares the feedback voltage from the voltage divider circuit with the reference voltage, and the results along a modulation comparator output a drive signal to control the duty cycle in order to avoid the generation of inrush current. The present invention avoids inrush current caused by the large drive signal and achieves a good response rate and better system stability.

Abstract: In one embodiment, an LED driving circuit can include: (i) a sense circuit configured to sense an inductor voltage, and to generate a sense voltage signal; (ii) a protection control circuit configured to activate a first protection control signal in response to a comparison of the sense voltage signal against a first reference voltage to indicate an LED device is in a first load state; (iii) the protection control circuit being configured to activate a second protection control signal in response to a comparison of the sense voltage signal against a second reference voltage to indicate the LED device is in a second load state; and (iv) a PWM control circuit configured to control a power switch according to the first protection control signal or the second protection control signal, based on the load state of the LED device.

Abstract: Aspects are directed to low dropout regulation. In accordance with one or more embodiments, an apparatus includes a charge pump that generates an output using a reference voltage, a low dropout (LDO) regulator circuit, current-limit and a voltage-limit circuit. The LDO circuit includes an amplifier powered by the charge pump and that provides an LDO voltage output. The voltage-limit circuit includes a transistor coupled between a voltage supply line and the LDO regulator circuit and a gate driven by the charge pump. The voltage-limit circuit limits voltage coupled between the voltage supply line and the LDO regulator circuit based upon the output of the charge pump, such as by coupling the voltage at the voltage supply line via source/drain connection of the transistor under low-voltage conditions, and providing a limited voltage to the LDO regulator circuit under high voltage conditions on the voltage supply line.

Abstract: A portable electronic apparatus and a power management method are provided. The portable electronic apparatus includes a power manager and a controller. The power manager is used to receive a supply power generated by a power adapter. The power manager determines whether to generate a detecting signal by detecting whether a voltage value variation of the supply power is greater than a preset range. The power manager generates a current detecting value according to an input current provided by the supply power. The controller receives the detecting signal and the current detecting value, and generates an input current limit value according to a receiving status of the detecting signal and the current detecting value. The power manager controls the input current according to the input current limit value.

Abstract: An open load and a supply fault are differentiated between and detected with a simple configuration. A switching element (Q1) connected between the positive electrode of a direct current power supply and an output terminal (9) is caused to carry out a switching operation, thereby driving a load (7) connected to the output terminal (9). A load trouble detection circuit (21) that detects an opening of the load (7) or a supply fault when the voltage of the output terminal (9) is higher than the value of a first threshold voltage, and a supply fault detection circuit (25) that detects a failure of supply to the power supply of the load (7) when the voltage of the output terminal (9) is higher than the value of a second threshold value voltage subtracted from the power supply voltage when the switching element (Q1) is in an off-state, are included.

Abstract: Serially connected low voltage transistors are used to replace a high voltage transistor in a voltage conversion circuit for a driver, or parallel connected sub-transistors are used to establish a high voltage transistor having an effective size dynamically adjusted according to loading of the driver, to reduce switching loss and thereby improve the efficiency of the driver.

Abstract: A wide input voltage power supply circuit for a load includes a first regulation stage and a second regulation stage. The first regulation stage includes a linear regulator circuit configured to maintain a bus voltage within a predefined voltage range when an input voltage exceeds a predefined input level. A second regulation stage includes a buck converter circuit configured to regulate an average bus voltage to a predetermined load level. The second regulation stage includes an under voltage lockout configuration, with the under voltage lockout configured to set a minimum turn-on voltage for the load.

Abstract: A protection circuit of a DC-DC converter is disclosed. An input terminal of the DC-DC converter receives an input voltage and an output terminal of the DC-DC converter provides an output voltage. The DC-DC converter includes an output stage between the input terminal and the output terminal. The protection circuit includes a current sensor, a comparator, a determining circuit, and a protection control circuit. The current sensor provides a sensing signal. The comparator compares a default over-voltage with the sensing signal to provide an over-current control signal. The determining circuit provides a determining control signal. The protection control circuit determines whether to enable a short protection according to the over-current control signal and the determining control signal.

Abstract: A regulator and a DC/DC converter are provided in which a soft start is carried out even when an output is short-circuited by abnormality. Regulator includes soft start circuit that gradually starts up a reference voltage that is input into error amplifier from 0 V to the reference voltage and soft start reset circuit that monitors an input of error amplifier and performs soft start of soft start circuit again when an output of output terminal Vo is short-circuited. Soft start reset circuit includes comparator that is disposed in parallel with an input of error amplifier, offset voltage that gives an offset to the input of comparator, and NPN transistor that is turned on or off in accordance with a result of comparison of comparator and discharges capacitor C by being turned on when the output is short-circuited.

Abstract: A switching mode power supply apparatus includes a conversion unit to convert input power into output power having a predetermined voltage by performing a switching operation, a light emitting unit to emit light if the voltage of the output power exceeds a predetermined threshold voltage, a light receiving unit to receive the light emitted from the light emitting unit and output a signal indicative of the voltage of the output power, a switching controller to control the switching operation of the conversion unit according to the voltage of the output power indicated by the signal output from the light receiving unit, and a disconnection unit to disconnect power applied to the light receiving unit if a voltage of the power applied to the light receiving unit exceeds a predetermined trigger voltage.

Abstract: A voltage regulator having good transient response characteristics and maintaining stable operation is provided. The voltage regulator includes: a first MOS transistor having a gate terminal connected to an output terminal of the differential amplifier circuit; a first constant current source provided between the first MOS transistor and a ground terminal; an output MOS transistor having a gate terminal connected to a drain terminal of the first MOS transistor via a phase compensation circuit; a second MOS transistor having a gate terminal to which an output of the differential amplifier circuit is input and a drain terminal connected to the gate terminal of the output MOS transistor; and a second constant current source provided between the second MOS transistor and a ground terminal.

Abstract: A method and an apparatus for supplying power to a 300 PIN MSA 40 Gb TRANSPONDER (22), wherein the apparatus comprises a power supply control module (21), a first resistor (R2), a second resistor (R3) and a third resistor (R4). The power supply control module (21) supplies power to the TRANSPONDER (22) through the APS Digital pin (APS Digital) of the TRANSPONDER (22). A reference voltage terminal (Vfeedback) of the power supply control module (21) is connected to the APS Sense pin (APS Sense) of the TRANSPONDER (22) by the second resistor (R3), connected to the APS Set pin (APS Set) of the TRANSPONDER (22) by the first resistor (R2) and connected to the bias voltage terminal (Vbias) of the power supply control module (21) by the third resistor (R4). The method and the apparatus can increase selection of the power supply control module (21) without occupying excessive space of circuit board, while ensuring precision of supply voltage.

Abstract: An intrinsic safety approach is provided for a battery powered communication device. Sparking is prevented at radio contacts during attachment and removal of a battery (104, 204, 304, 404) from a radio (102, 202, 302, 402) through the use of switches (112, 212, 312, 412/424) to isolate the radio capacitors from the radio contacts and/or dissipate energy from the radio capacitor through a discharge resistor (214, 314, 414).

Abstract: A variable current limiter, a power supply and a method of operating a non-isolated voltage converter are disclosed herein. In one embodiment, the variable current limiter includes: (1) a converter controller configured to regulate an output voltage of a non-isolated voltage converter and limit an output current thereof and (2) a limit provider configured to provide a variable output current limit that inversely varies with the output voltage, the converter controller configured to employ the variable output current limit to limit the output current.

Abstract: A mobile wireless communications device may include a device housing, and mobile wireless communications device circuitry carried by the device housing. The device may also include a removable electrical power supply module coupled to the mobile wireless communications device circuitry. The removable electrical power supply module may include a module housing, and within the module housing, a battery cell, a DC-to-DC converter coupled to the battery cell, and an output inductor coupled to the DC-to-DC converter. The removable electrical power supply module may also include, within the module housing, a spark suppression circuit coupled to the output inductor, and an output voltage clamp circuit coupled to the output inductor. The removable electrical power supply module may further include a pair of output terminals carried by the module housing and coupled to the output voltage clamp circuit.

Abstract: A power system and a control method thereof are disclosed. The power system comprises: providing a plurality of power sources; electrically connecting a plurality of converters between the power sources and at least one load, wherein the converters are electrically connected to the power sources respectively in a one-to-one manner; and positive feed-forward controlling each of the converters by using a positive feed-forward control circuit electrically connected to one of the power sources in a one-to-one manner, for the use to protect the input voltage source from over-current drawing by reducing the input current of the converter when the source voltage drops, regardless constant output-voltage.

Abstract: Disclosed is an output stage, and associated apparatus, for a voltage regulator that includes a clamp circuit that is operable to ensure that the output voltage recovers quickly, i.e. that the perturbation of this voltage is limited and remains within a given specification, when entering a standby mode and which is controlled in a supply independent manner.

Abstract: A switching power supply circuit comprises: a differential amplification stage for outputting an error signal representing a difference voltage between a preset reference voltage and a voltage based on an output voltage; an ON-time generation circuit for defining a period of time during which a main switching element is kept ON; a flip-flop circuit which is set by a set signal based on the error signal and reset by a reset signal being an output of the ON-time generation circuit; current information means for detecting current information representing a current flowing to a subordinate switching element; current information detecting means for supplying a current information detecting signal, which makes an adjustment based on the current information so as to delay the timing of the rise of the set signal, to the output side or the interior of the differential amplification stage; and current information holding means for holding the current information detected by the current information means at a moment wh

Abstract: A voltage regulator is capable of continuously and smoothly preventing an inrush current independently of a startup characteristic of a reference voltage circuit. The voltage regulator is provided with an inrush current protection circuit composed of a constant-current circuit, a first transistor having the source thereof connected to the constant-current circuit and the gate thereof controlled by an output voltage detection circuit, a capacitor connected between the first transistor and the gate of an output transistor, a second transistor having the gate thereof connected to the drain of the first transistor and the source thereof connected to a power supply terminal, and a third transistor, which is connected between the second transistor and the output transistor and the gate of which is controlled by the output voltage detection circuit.

Abstract: A voltage regulator circuit comprises an error amplifier for generating, an error signal responsive to a reference voltage in a feedback signal. A feedback circuit provides the feedback voltage signal to the error amplifier and a driver circuit provides regulated output voltage responsive to the input voltage in the error signal. Short circuit protection circuitry selectively protects transistors within the error amplifier, the feedback amplifier and the driver circuit responsive to a short circuit protection enablement signal.

Abstract: A voltage regulator circuit comprises active and standby amplifiers, first and second transistors, and a capacitor. The active amplifier has a negative input connected to a first reference voltage, and the standby amplifier has a negative input connected to a second reference voltage. The first reference voltage is greater than the second reference voltage. The first transistor has a gate connected to an output of the active amplifier and a drain connected to a voltage regulated output, and the second transistor has a gate connected to an output of the standby amplifier and a drain connected to the voltage regulated output. The capacitor is connected between a chip enable signal and the voltage regulated output.

Abstract: System and method for reducing power consumption during peak demand period is disclosed. A consumption unit comprises a power limiter. An AC power limiter converts a portion of AC power into heat and generates an output for a temperature sensor. A comparator has one of the inputs as the output of the temperature sensor and another input as a reference generated by a controller. A feedback loop is established by connecting output of the comparator to secondary winding of a power transformer through a switch. A DC power limiter is also disclosed.

Abstract: In a low drop out (LDO) regulator and a semiconductor device including the LDO regulator, the LDO regulator regulates a power supply voltage and applies the regulated power supply voltage to a load. The LDO regulator comprises: an output node connected to the load; a pass transistor that applies a power supply voltage to the output node; and a controller that generates a load enable signal enabling the load by delaying a regulator enable signal by a first delay time, and that increases a gate voltage of the pass transistor after receiving the regulator enable signal to thereby reduce a current flowing through the pass transistor.

Abstract: A circuit includes a first resistor, a second resistor, a voltage follower and a current mirror. The first resistor converts a current flowing through the first resistor to a voltage drop between positive and negative sides of the first resistor. The second resistor is coupled to the negative side of the first resistor. The voltage follower is coupled to the positive side of the first resistor via a non-inverting terminal, and coupled to the negative side of the first resistor through the second resistor via an inverting terminal to cause a voltage at the inverting terminal to follow a voltage at the non-inverting terminal. The current mirror is coupled to the voltage follower to provide a sensing current proportional to the current flowing through the first resistor.

Abstract: A lamp includes an arc tube and a lighting unit for lighting the arc tube. The lighting unit includes a rectifier circuit, a smoothing circuit for partial smoothing, and an inverter circuit having a pair of switching elements. The smoothing circuit smoothes portions of the output voltage of the rectifier circuit below the first voltage value and outputs a voltage that falls between the first voltage value and the second voltage value. The discharge sustaining voltage of the arc tube is set to fall between the first and second values of the voltage Vdc output from the smoothing circuit.

Abstract: A shunt regulator includes a control circuit, a bypass circuit and a protection circuit. The control circuit is coupled between a first node and a ground, and generates a gate control signal in response to a voltage of the first node and a reference voltage. The bypass circuit forms a first current path between the first node and the ground in response to the gate control signal. The protection circuit has an MOS transistor that is fully turned on in response to a current flowing through the bypass circuit, and forms a second current path between the first node and the ground. Therefore, the shunt regulator occupies a relatively small area in an integrated circuit.

Abstract: Provided are: a power supply control circuit having a configuration in which an N-channel FET and a P-channel FET can appropriately and selectively be used so as to control power feeding with high efficiency and at low cost; and a power supply control device including the power supply control circuit. An N-channel FET (NchFET in the drawings) and a P-channel FET (PchFET in the drawings) are connected in parallel with each other between the positive voltage side (+B) of a battery (direct current power supply) and a plurality of ECUs (loads) 4, 4, . . . , so as to appropriately control ON and OFF.

Abstract: A power interruption detecting system includes an electronic device and a power interruption detecting device. The electronic device includes a power supply, a protection circuit, a main circuit and a recording structure. The power supply includes a first power supplying module and a second power supplying module. The protection circuit is connected in parallel to the first power supplying module. The main circuit is connected in parallel to the first power supplying module. The recording structure is connected to the main circuit and configured for collecting a number of values of working voltage of the main circuit. The power interruption detecting device is configured for determining a cause for a shutting down problem happened to the electronic device, according to the values of the working voltage.

Abstract: Multiple embodiments of a linear voltage regulator are described that use a bipolar output transistor to deliver current and a regulated voltage to a load. The bipolar output transistor assures low output impedance providing isolation from load induced noise. A first depletion mode field effect transistor FET drives the output transistor dependent on a correction signal from an error amplifier. The error amplifier compares a fixed voltage reference to a portion of the output voltage to set a control voltage for the FET gate. Output voltage is set with an offset voltage referenced to circuit ground and can be generated with a single resistor to circuit ground by a current through the resistor which is set from VREF and the regulated output voltage. Output current is limited with a second depletion mode FET that senses the difference in regulator output voltage and voltage at said first FET transistor drain.

Abstract: Gaming machines and related methods for controlling and managing electrical current to peripheral devices in a gaming machine are described. A gaming machine having multiple high-current peripheral devices drawing power from a single power supply within the gaming machine is able to regulate the timing at which the peripherals may receive power. The gaming machine may be a multi-station gaming machine, such as a gaming table, where each station has various standard peripheral devices. The gaming machine determines whether the power required by the peripherals at any given time will exceed a threshold current supply and, if so, delays the operation of one of the peripherals to regulate the amount of current the power supply has to supply at any given time. Current usage and time overlaps of two or more peripheral devices are determined using current profiles of the devices.

Abstract: A switching mode power supply apparatus includes a conversion unit to convert input power into output power having a predetermined voltage by performing a switching operation, a light emitting unit to emit light if the voltage of the output power exceeds a predetermined threshold voltage, a light receiving unit to receive the light emitted from the light emitting unit and output a signal indicative of the voltage of the output power, a switching controller to control the switching operation of the conversion unit according to the voltage of the output power indicated by the signal output from the light receiving unit, and a disconnection unit to disconnect power applied to the light receiving unit if a voltage of the power applied to the light receiving unit exceeds a predetermined trigger voltage.

Abstract: Detection accuracy of a short circuit state in a load driving circuit is improved thereby operation efficiency of a motor may be enhanced. A gate control circuit 25 turns off NMOS transistors Q1 and Q4, turns on an NMOS transistor Q3, and turns on and off an NMOS transistor Q2 intermittently so as to control rotation of a motor 10. A detection circuit 30a detects a voltage Va at a connection node a between the NMOS transistor Q2 and the motor 10 a predetermined time after the NMOS transistor Q2 is turned on. A control circuit 20 turns off the NMOS transistor Q2 so as to cut off a current from a power supply to the motor 10 if the voltage Va at the connection node a is within a range in which the motor 10 is determined to be short-circuited.

Abstract: The voltage of a detection resistor connected to the drain of a low-side switching device is normally a negative voltage, but a positive voltage appears when a countercurrent occurs in an abnormal state. A current comparator monitors the voltage of the detection resistor, transmits high output to an AND circuit whole the voltage of the detection resistor is a negative voltage to maintain the output voltage of the current comparator in a low state when an output signal of a driver can be transmitted to the low-side switching device, and allows the output voltage of the current comparator in a low state when the voltage of the detection resistor becomes a positive voltage, thereby forcibly turning off the low-side switching device.

Abstract: The present invention relates to a charge pump circuit with current detecting and a method thereof. The current detecting charge pump circuit includes a controlled current source, a load circuit which electrically connects to the charge pump circuit unit, and is driven by the charge pump circuit unit to generate a load current. A detecting circuit unit electrically connects to the load circuit, and produces a feedback signal according to the load circuit. A feedback circuit unit which electrically connects to the detecting circuit unit, receives the feedback signal, and adjusts a current of the controlled current source according to the feedback signal. The charge pump circuit also includes a protecting circuit unit which is able to detect feedback signal to protect the circuit according to the feedback signal.

Abstract: A biologic and medical multi-channel low voltage micro-electric-field generator including a power supply unit, at least one micro-electric-field generating unit set comprising a step-down unit, a linear regulator unit, and a pulse generating and outputting unit, and a programmable logic control unit. The micro-electric-field generating unit set is connected to an output end of the power supply unit. The step-down unit depresses the voltage of frequency power. The linear regulator unit regulates the output of the step-down unit. The pulse generating and outputting unit turns on/off the output of the linear regulator unit and connects to a network electrode group. The programmable logic control unit controls the characteristics of the output pulse from the pulse generating and outputting unit. The generator is applicable in gene, protein, drug and/or a variety of plasmids delivery to the organs, cells within the tissues of large animal or human.

Abstract: A constant-voltage circuit converts a voltage input to an input terminal and outputs a predetermined constant voltage from an output terminal. The constant-voltage circuit includes an output transistor to output an electrical current to the output terminal in response to a control signal, a reference voltage circuit to generate a predetermined reference voltage, a control circuit to adjust a voltage proportional to the output voltage output from the output terminal to the reference voltage output from the reference voltage circuit by controlling the output transistor and a soft start circuit including a capacitor for soft start that is charged at start-up and a current control unit to control an electrical current supplied to the reference voltage circuit. The current control unit adjusts the reference voltage to a voltage determined by the capacitor for soft start at the start-up until the reference voltage reaches a desired voltage.

Abstract: An AC to DC power supply for small heat sensitive electronic device. The power supply being dynamically controlled to operate symmetrically about the lowest point of the AC source voltage waveform for minimum excess heat production.

Abstract: A current sensing circuit includes a first resistor, a second resistor and a sense amplifier. The first resistor converts a current flowing through the first resistor to a voltage drop between positive and negative sides of the first resistor. The second resistor is coupled to the negative side of the first resistor. The sense amplifier is coupled to the positive side of the first resistor via a first pin of the sense amplifier, and coupled to the negative side of the first resistor through the second resistor via a second pin of the sense amplifier. The sense amplifier employs a negative feedback to generate a sensing current proportional to the current flowing through the first resistor.

Abstract: An electrical power diagnostic system includes a system housing, a power saw management system, and a user interface. The system housing is electrically connected with the power unit of the power saw, wherein the system housing includes a control panel provided thereon for allowing a user to adjust an operational parameter through the control panel. The power saw management system includes a control processor mounted within the system housing to electrically communicate with the power saw, wherein the control processor is pre-programmed to manage operational parameters of the power saw and supervise actual operation of the power saw machine and the saw blade in such a manner that when abnormal operating condition of the power saw machine is detected, the control processor is adapted to selectively adjust the operational parameters of the power saw machine for stopping the abnormal operating condition from continuously happening.

Abstract: A current mirroring circuit is provided. The circuit generally comprises a current source; a first drain extended (DE) MOS transistor, a second DE MOS transistor, a current mirror, and differential amplifier. The current source is generally coupled to the current source at its drain, while the current mirror that is coupled to the sources of the first and second DE MOS transistors and to the current source. The differential amplifier generally has a first input that is coupled to the source of the first DE MOS transistor, a second input that is coupled to the source of the second DE MOS transistor, a first output that is coupled to the gate of the second DE MOS transistor, and a second output that is coupled to the gate of the first DE MOS transistor.

Abstract: An intrinsically safe energy limited circuit for space-restricted applications includes a fuse and resistor in series with a protected circuit or component wherein the fuse dissipates most of the power when the protected circuit or component is short circuited.

Abstract: A power extractor suitable for locations proximate to the sink of a signal channel is disclosed. The power extractor can generate power from the signal channel without substantially disturbing a quality of signals within the channel. In one embodiment, the power extraction circuit can include: a current source coupled to a sink side of a signal channel, where the signal channel is independent of any power supply signal, the current source being high impedance to maintain signal quality within the signal channel; a first regulator configured to generate a first regulated supply from a current derived from the signal channel using the current source; and a second regulator coupled to the first regulator, where the second regulator is configured to generate a second regulated supply from the first regulated supply.

Abstract: A series regulator with an over current protection circuit regulates output current by controlling an output transistor. A current sense transistor output depends on the conductivity of the output transistor. A current limiting transistor controls the conductivity of the output transistor. A current supply provides current to a constant current source and a converter output of a current to voltage converter. The converter output is connected to a control electrode of the current limiting transistor. A first differential transistor couples the current sense transistor to the constant current source and a second differential transistor couples the current supply to the constant current source. The current sense transistor controls the second differential transistor to vary a control current. When the control current matches a threshold value, the current limiting transistor limits maximum current flow through the output transistor.