Abstract: A system and method for compensating for voltage drops in a device having a remote node is disclosed. A power supply unit has an adjustable voltage output and a feedback circuit. A power path is coupled to the power supply unit to supply voltage to the remote node. A switch has an output coupled to the feedback circuit, a first input coupled to the power path, and a second input coupled to the remote node. A controller is coupled to the switch. The controller is operable to control the switch to switch between the inputs to cause the feedback circuit of the power supply unit to compensate the voltage output for a voltage drop on the power path or the remote node.

Abstract: The present disclosure generally relates to a test method and system thereof. The test method comprises: outputting a test control signal to a test power supply of the circuit under test so as to adjust an input signal of the circuit under test so that a gain range of the circuit under test in an abnormal operating state is the same as that of the circuit under test in a normal operating state when the circuit under test enters into the abnormal operating state. The present disclosure may meet requirements for equipment test without sacrificing the efficiency of circuits in normal operating state or adding complexity circuit.

Abstract: A disclosed method includes outputting, by an electrical component residing in a downhole tool, a clocked digital output. The method also includes adjusting, by a variable impedance circuit external to the electrical component, an impedance value in series with the clocked digital output as a function of temperature.

Abstract: A detection circuit for detecting an external device with a specific resistance is provided. The detection circuit includes a first resistor, a second resistor, a first converter, a second converter, a device converter, a first current comparator, and a second current comparator. The first resistor has a first resistance. The second resistor has a second resistance. The first converter is configured to convert the first resistance into a first current. The second converter is configured to convert the second resistance into a second current. The device converter is configured to convert the specific resistance into a specific current. The first current comparator is configured to compare the specific current with the first current, and generate a first output signal. The second current comparator is configured to compare the specific current with the second current, and generate a second output signal.

Abstract: A limiter for high-frequency signals has an input, whereas the high-frequency signal is supplied to the limiter at its input. The limiter provides several limiting stages which are electrically connected to the input. Each limiting stage is a series circuit with an unbiased diode and a Zener diode which does not serve to bias the diode, so that the high-frequency signal is electrically connected to a reference ground via the one unbiased diode and the Zener diode.

Abstract: The present invention discloses a dynamic voltage adjustment device for dynamically adjusting an output voltage of a power transmission system which generates the output voltage according to a feedback signal and a reference signal and transmits the output voltage to a remote load via a transmission line to generate a load current. The dynamic voltage adjustment device comprises a first signal terminal, for receiving a first signal corresponding to a forward transmission voltage drop of the transmission line; a second signal terminal, for receiving a second signal corresponding to a reverse transmission voltage drop of the transmission line; a third signal terminal for receiving a reference voltage; a feedback circuit, for generating a feedback signal according to the first signal; and a adder circuit, for generating the reference signal according to the second signal and the reference voltage.

Abstract: A power system is configured to provide a regulated voltage to an electrical load connected to a power source through at least one power line. The power system includes a first voltage control loop based on a remote sense signal indicative of voltage level at the load. The power system further includes a second voltage control loop based on a local sense signal indicative of a level of output voltage at the power source. The voltage level of the local sense signal is generally at a higher voltage level relative to the voltage level of the remote sense signal. Circuitry is configured to pass just the signal with the higher voltage level to ensure that the local sense control loop is a dominant control loop with respect to the remote sense control loop. This avoids effects on the power source from one or more failure modes that can occur in interconnections of the system.

Abstract: A detection method and apparatus that includes a controller and a plurality of remote sensor units, each containing sensor elements, connected to the controller to achieve custom detection profiles and resolutions that are optimized for a given application by alteration of scanning sequences used by the controller, variation of scanning frequencies, adjustment in response times, and utilization of multi-modal sensing methods.

Abstract: A device for generating electrical energy for a power supply bus connected to a load. The device includes an electrical energy storage unit having at least one battery, a solar energy generator presenting a plurality of modules, a regulator for controlling discharging of the storage unit to power the bus, and for each module, a three-state control device. The device also includes a control unit causing the control devices to take up one of their three states. Each three-state control device has a first state in which current from the module powers the bus, a second state in which current from module powers the storage unit, and a third state in which the module is short-circuited.

Abstract: Apparatus and method is disclosed for overcoming the voltage attenuation and ground shifts normally associated with providing DC power to distributed loads from a DC power supply without the need for excessively large conductors, the need to distribute the DC power supply or the need to provide converters at or near each load. Reasonably accurate voltage regulation at each load is provided according to the invention while using low but not insignificant resistance power conductors by providing similarly low resistance voltage sense conductors. The loads are connected between the sense conductors in a distributed fashion. Current approximating that drawn by each load is injected from the power conductors to the sense conductors at or near each load. Dynamic current requirements are supplied by capacitors connected across each load, usually mounted on the load circuit boards.

Abstract: An apparatus for and method of inhibiting and overriding the normal operating mode of one or more input devices connected to a communications network. The present invention functions within an electrical network made up of a plurality of input devices wherein a group of input devices is capable of commanding an electrical control device to apply and remove electrical power from an electrical load connected thereto. The input devices or nodes communicate with the electrical control device over a communications network. When one of the input devices is turned off, the normal operating mode of all the other input sensors is inhibited. The electrical control device remains inhibited until all the input devices are no longer in the off position. Thus, electrical power to the load controlled by the electrical control device remains disconnected until all input devices are in the on position. Local and remote signaling, control and indication diagnostic and monitoring functions are also provided.

Abstract: A system to control the output voltage of a power converter in response to a specific load battery condition. The system contains a power converter, a TCMS interface attached thereto and a controller for selectively and/or adaptably changing the magnitude of converter output voltage. A control module is incorporated in the system to automatically change converter output voltage up or down in response to the load (input) voltage. The module contains a microcontroller to sense the battery (input) voltage process said input voltage with an analog-to-digital converter. The microcontroller is programmed to execute a series of routines to determine the proper charging voltage for the system. Thereafter, the control module communicates this information through the interface of the power converter to cause the power converter to charge at the optimum voltage. In the alternative, a plug-in component containing passive circuitry may be used to manually signal the power converter to charge at a predetermined voltage.

Abstract: A high-speed responsive power supply for measuring equipment minimizes the heating value of a load current in the high-speed responsive power supply mounted on a test head. In order to achieve the object, the high-speed responsive power supply for measuring equipment is constructed as follows. The high-speed responsive power supply is incorporated inside the test head which a device under test is detachably mounted on. A remote sensing power supply provided inside a tester body rack disposed a specific distance from the test head feeds a power supply voltage to the high-speed responsive power supply. From the high-speed responsive power supply, an output supply voltage is fed to the device under test. The remote sensing power supply controls the power supply voltage so that a potential difference between the output supply voltage and the power supply voltage will be minimized within a range where the high-speed responsive power supply operates normally.

Abstract: A system for providing large quantities of power at a selected voltage to a downhole well tool. A conductor extends between a surface regulator and the well tool. The voltage is continuously measured downhole at the well tool, and a signal proportional to such downhole voltage is transmitted to the surface regulator. The power transmitted by the surface regulator to the conductor is increased or decreased depending on fluctuations in the tool requirements and the downhole voltage. The downhole voltage signal can be modulated through the conductor to the surface regulator or can be transmitted through another conductor.

Abstract: A remote load (14) is powered by a power supply 12 in response to a PWM IC (9), the error amp (10) of which is responsive to a voltage feedback signal on remote sense leads (19, 20) from the load. Remote sense leads (19, 20) are applied through a polarity correcting bridge (23) to the input (11) of the error amp (10). To compensate for broken leads, when the output of the bridge (28) falls below a threshold voltage (32), a switch (34) operates to connect the input of the error amp to the output (16, 37) of the power supply, locally.

Abstract: An electrical interface circuit (200), for use with a zirconium dioxide sensor (202), includes an input differential amplifier (208) having its inverting input coupled to the circuit input (204) to receive a sensor voltage relative to sensor ground potential, and having its output coupled to the circuit output (210) to produce an output voltage relative to circuit ground potential. Additionally a feedback differential amplifier (214) has its inverting input coupled to the circuit output (210), its non-inverting input coupled to sensor ground potential, and its output coupled to the non-inverting input of the input differential amplifier (208) so that voltage change at the circuit input due to change of sensor ground potential relative to circuit ground potential is substantially cancelled.

Abstract: An input/output circuit for performing tests prior to controlling an electrical load (2) which is decoupled by a transformer (5). An input (E) thereto acts on a first switching member (6) connected in series with a primary winding of the transformer in a power supply circuit for said primary winding. An output (S) provides a signal on the basis of the voltage present across the terminals of an output resistor (7) connected in series with the primary winding of the transformer in the power supply circuit of said winding. A second switching member (3) is inserted in series with the load in a power supply circuit for said load, and is controlled from the input to the input/output circuit via the transformer and a rectifier circuit (10) connected to the terminals of a secondary winding of the transformer. An impedance-switching circuit (13, 16) is connected to the terminals of the second winding in order to act on the input/output circuit by changing the voltage across the terminals of its output resistor.

Abstract: A potentiometer position switch circuit which includes a meter mechanism having a low friction potentiometer coupled to move therewith. The output of the low friction potentiometer is coupled together with the output of a set point potentiometer across the input terminals of a comparator. A magnetic latching double pole, double throw relay having set and reset relay coils is connected to the output of the comparator through the gate of a first voltage operated transistor and through sufficient resistance to minimize current drain and also through an invertor to the gate of a second voltage operated transistor and through a second resistor of sufficient resistance to minimize current drain. The output of the first voltage operated transistor is connected from a second voltage source through the set relay coil to ground and the output of the second voltage operated transistor is connected from a voltage source through said reset relay coil to ground.

Abstract: In a circuit arrangement for automatic connection of a remote feed current path of a remote feed loop fed from both sides for electrical loads with direct current series feed, a parallel circuit of a first four-terminal network comprising two feed outputs and a second four-terminal network containing a connecting two-terminal network, controllable by current sensors, is provided for the acquisition of a feed output per remote feed current path, this being undertaken by way of diode current branches. The circuit arrangement can advantageously be employed for the remote feed of regenerators and communications transmission links.

Abstract: An apparatus increases the accuracy of a signal delivered from a remote analog sensor to an analog to digital converter. The output of the sensor is derived from a ratio between the power applied and the sensed parameter; thus, any changes to the power applied affects the accuracy of the sensor output. It is, therefore, advantageous to closely control the voltage applied to the sensor. The apparatus monitors the voltage drop across the lead lines which extend between the sensor and a power supply and increases the voltage applied to the sensor by a magnitude corresponding to the lead line voltage drop. The accuracy of the sensor is preserved independent of the lead line length and resistance.

Abstract: A temperature controller with a remote sensor having a high temperature cutoff with circuit means to prevent operation of the unit if tampered with to bypass a safety function. A remote sensor has a thermal fuse and diode feeding a pulsating D.C. voltage to a control circuit having a capacitor and an impedance means to which pulsating D.C. is fed. If the sensor unit is bypassed the thermal fuse in the controller burns out to render the controller inoperative.

Abstract: A system and method of connecting power supplies in parallel that provides desired voltage regulation at the load and current sharing between the power supplies. The power supplies are connected in parallel at the load. Each power supply also has a sense line connected at the load. Each power supply includes means for measuring the current delivered to the load. Each supply also includes an electronically controlled variable resistive element in its respective sense line. The amount of current being supplied by each power supply to the load is measured. A controller determines if an unacceptable imbalanced current condition exists, i.e., it determines which power supply is supplying too much or too little current and the controller selectively changes the value of the appropriate variable resistive element in the sense line of that power supply in order to change the current being delivered to the load in a direction that corrects for the imbalanced condition.

Abstract: An over-current sensing circuit for use with a switching-type power supply for achieving fold-back, which senses not only the load current drawn from the power supply, but also the voltage at the load and the voltage across the power supply potentiometer which is used to set the output voltage. The sensing circuit thereby serves to maintain the current limit point at which fold-back occurs virtually constant in the presence of adjustments of the output voltage of the power supply and regardless of the resistance of the bus which connects the power supply to the load.

Abstract: A regulated voltage supply (10) for delivering a substantially constant voltage to a load (12) having a regulator (24) for controlling a raw voltage supply (22) to deliver that constant potential, wherein the supply includes sense leads (28 and 30) between the load and the regulator for monitoring load voltage, provided with a sense current cancellation circuit (30) for nulling sense current and preventing it from flowing through the sense leads; in a preferred implementation, including voltage-to-current converters (42 and 44) bridging respectively the output terminals (14 and 16) and the sense terminals (32 and 34), it provides a cancellation current equal in magnitude and opposite in direction to the sense current.

Abstract: A circuit for use in a power supply of the type which regulates the voltage at a load remotely connected to the output of the supply. The circuit allows the voltage at the load to be sensed so that the voltage control loop of the supply can control the load voltage in a relatively accurate manner. The circuit also provides means to detect the breakage of any one of the sense leads.

Abstract: A temperature controller for monitoring the temperature of a rotating heating system and regulating the temperature relative to a desired temperature. A transmitter within the rotating system coupled to a remote stationary controller via slip rings produces a magnitude varying current control signal within a calibrated range at a magnitude proportional to the sensed temperature. A pair of voltage dividers within the transmitter establish the level and range of current magnitude relative to a constant current source. The remote stationary controller compares the current control signal to a set-point and synchronously supplies power to the heater elements of the rotating system, so long as the sensed temperature is below the desired temperature.

Abstract: A testable load driving circuit apparatus includes a solid-state load driver for controlling AC current loads coupled in series with a winding of a saturable core reactor used for sensing the presence or absence of load current through a load current monitor which is coupled to another winding in the reactor. The load driving circuitry may be tested during circuit operation by injecting a signal of insufficient duration to substantially affect the load circuit.

Abstract: Circuits for providing a variable-amplitude D.C. analog control signal to a load, responsive to the time duration of a periodic, variable-pulse-width input signal, while providing isolation between the input signal circuit and the load circuit. Embodiments utilizing either a fly-back transformer or an optoelectronics isolator, are disclosed.

Abstract: In a remote control system which is operated by way of a light wave guides, a monitoring device is provided for a remotely controllable load, the monitoring device measuring the current through the load and deriving values therefrom for the proper and the improper operating state of the load. All switches participating in the drive and monitoring functions with respect to the load are incorporated in a check concerning the operability of the monitor and of the load, the check being carried out during operation of the load.

Abstract: An RTD probe interface having a three-wire interconnection with a source excitation line, a source return line, and a sensed signal line, includes: an excitation signal source connected between the source excitation line and the source return line for providing an excitation current signal through the RTD; an amplifier having first and second signal inputs connected respectively to the source excitation line and the sensed signal line, for providing an output voltage signal at a magnitude proportional to the difference magnitude between the voltage signals present at the first and second amplifier inputs, and a bias signal source connected between the sensed signal line and the source return line for presenting a bias current signal to the sensed line, at a magnitude and phase equal to that of the excitation current signal, for providing equal line impedance dependent values in the voltage signals appearing at the first and second inputs of the amplifier.