104 results about "Load line" patented technology

A dimmer control system has a communication control loop that connects a master unit in series with a plurality of remote units, and it is superimposed in series on the dimmer load line so as to allow two-way communication between the master unit and remote units without affecting the operation of the load. Communications from the master to the remote units are encoded in loop current fluctuations, whereas communications from any remote to the master unit are encoded in loop voltage fluctuations. The master unit has a switched power supply, for use during normal LOAD ON operation, in tandem with a capacitive power supply, for use during LOAD OFF operation of the control units so as to minimize hum. The master unit power supply circuit provides an output rail voltage comprised of a reference voltage for the load superimposed with a control loop voltage for the voltage drop across the series-connected remote units. The master unit has a POWER OFF detection circuit and a non-volatile memory for storing system status information, so that when power is restored, the system can be restored to its former power level. The switch units are formed with a cover frame mounting a switch plate on a hinge axis allowing ON/OFF movement of an opposing side thereof. An array of LED light pipes is mounted in the switch plate aligned with the hinge axis, in order to minimize displacement of the light pipes during actuator movement.

An amplifier system including a push-pull power amplifier having an input to receive a radio frequency (RF) input signal and an output, the push-pull power amplifier being configured to amplify the RF input signal and provide at the output an RF output signal that is an amplified version of the RF input signal, a switchable shunt capacitance switchably connected between a load-line connected to the output of the push-pull power amplifier and a reference potential, and a switch configured to selectively connect the switchable shunt capacitance to the reference potential and disconnect the switchable shunt capacitance from the reference potential to vary an impedance of load-line.

The invention provides a load circuit fault detection circuit and method applied to breaker reclosing. The load circuit fault detection circuit comprises a detecting circuit and a controller, the detecting circuit is connected with a load circuit for detecting the load circuit, and the detecting circuit comprises a short circuit detecting circuit and an electric leakage detection circuit which are used for detecting the short circuit fault and the electric leakage fault of the load circuit respectively. The controller is connected with the detecting circuit and a breaker respectively, and the controller controls the detecting circuit to detect the load circuit before the breaker is closed. According to the load circuit fault detection circuit, on the basis of electric leakage protection, short circuit protection and overload protection during normal working of a load, fault detection is conducted on the faulted breaker before reclosing, the load circuit is reclosed after the fault is removed, and the safety performance of the reclosed breaker is improved. The problems that whether circuit faults are overcome can not be determined, and potential safety hazards exist in a breaker in the prior art are effectively solved.

The invention provides a testing method for memory voltage of a Loongson server motherboard, which is as follows: memory power supply adapters are inserted into the Loongson server motherboard, if more than two memory power supply adapters are adopted, the two neighboring memory power supply adapters are connected through an adapter interconnecting wire, probes of oscilloscopes are connected with the memory power supply adapters, and electronic loading devices are connected with the memory power supply adapters through load lines. The invention adopts the electronic loading devices and the oscilloscopes for static and mobile multi-direction memory voltage testing. The testing method can ensure the reliable operation of the memory and improve the performance and quality of the server. Under the actual environment, the testing method utilizes the memory connecting plate to simulate the actual working state of the memory, adopts the electronic loading devices to comprehensively test the working voltage of the memory from different directions in static and movable ways, and can actually and effectively reflect the quality and index of the voltage circuit design of the memory, so as to obtain the accurate testing data.

An intelligent electrical circuit digital amperage display interface apparatus is disclosed. In use, the old style circuit breaker is replaced with the new apparatus for connecting electrical panels and using the apparatus of the present invention, displays the amperage that travels through a standard circuit breaker out to a device under use which shows the load on that circuit's line, twenty-four hours a day. In use, the apparatus allows the user (homeowner, landlord, utilities staff and anyone else) the capability to see what the amperage being used at any given moment in time as that circuit is being used or not. Additionally, a digital display integration interface is provided within the electrical circuit breaker for displaying to a user the smallest of amperage to the largest of amperage that is being used on any given circuit.

The invention discloses a load line loss compensation method and device for linear charging. The method comprises the following steps: charging a lithium battery; after the charging of the lithium battery enters a constant-voltage charging stage, monitoring a charging current; comparing the charging current with a preset line loss compensation starting threshold current, a preset line loss compensation turning threshold current and a charging termination threshold current: when the charging current is smaller than the line loss compensation starting threshold current, starting line loss compensation so as to increase the charging voltage; when the charging current is smaller than the line loss supplement turning threshold current, reducing the charging voltage; and when the charging current is smaller than the charging termination threshold current, stopping charging. The load line loss compensation method and device for linear charging can solve the problem of overlong constant-voltage charging time caused by load line loss.

The invention relates to an operating method of 35kV-overhead-line insulating-glove-method electrified disconnection and connection of a zero-load-line lead wire. Through an operating method of using an insulating aerial lift truck to carry out electrified disconnection and connection of the lead wire on a zero-load line, the method is cooperatively implemented by three kinds of work personnel: a work leader, bucket electricians and ground electricians. The method mainly includes steps of stop of line reclosing, on-site work instrument detection, insulating shielding and isolating measure taking, work instrument installation, electrified disconnection (connection) of the zero-load-line lead wire, termination of the insulating shielding and isolating measures, evacuation of the work personnel from the site and line reclosing restoring and the like. The beneficial effects of the operating method are that defects of an insulating platform operating method can be compensated, efficient and rapid operation of electrified connection and disconnection of a 35kV zero-load line can be realized, comparatively great economic benefit and social benefit can be generated, the work efficiency of a maintenance work and the safety benefit of the work personnel can be effectively improved and domestic blanks in the field can be filled effectively.

A voltage compensation circuit of a self-adaptive load cable comprises the following steps: firstly, converting an error amplifier output voltage containing peak current limit information of a primaryside feedback flyback converter into a first intermediate voltage related to the output current of the primary side feedback flyback converter by using an operation module; carrying out level shift conversion on the first intermediate voltage to obtain a second intermediate voltage capable of adapting to a common-mode input range of a voltage-current conversion module, and then carrying out ripple elimination conversion on the second intermediate voltage to obtain a third intermediate voltage; and enabling the third intermediate voltage to pass through a voltage-current conversion module to obtain a corresponding current, generating a voltage drop on a fifth resistor to obtain a compensation voltage in direct proportion to the output current, and superposing the compensation voltage to areference voltage for loop adjustment of the system to obtain a new reference voltage compensated by a load cable for loop adjustment of the system. Therefore, the output voltage of the primary side feedback flyback converter can change adaptively along with the load current, and the stability of the actual charging voltage is ensured.

The invention discloses a low-voltage intelligent power distribution self-healing and power supply switching control system, and the system comprises a plurality of 0.4 KV power supply load lines, an intelligent plastic shell switch and a background control system; and each power supply line comprises a transformer, a switch and a demand side electrical load. One end of the transformer is connected to a 10KV voltage line, and the other end of the transformer is electrically connected with a demand side electrical load through the switch and used for supplying power to the demand side electrical load. One end of the intelligent plastic shell switch is connected between the switch of one 0.4 KV power supply line and the demand side electrical load, and the other end of the intelligent plastic shell switch is connected into the switch of the other 0.4 KV power supply line and the demand side electrical load; and the intelligent plastic shell switch is used for acquiring power supply signals of incoming lines at two sides in real time and sending the power supply signals to the background control system so as to carry out closing control on the intelligent plastic shell switch, thereby realizing power transfer and supply of a demand side electrical load in any two 0.4 KV power supply lines. Automatic power supply switching can be realized.

The invention discloses a system and a method for testing the integrity of a server board card power supply. The system comprises a load line, a connecting line, an electronic load, a board card and an adapter plate, one end of the load line is connected to the output end of a VR power supply on the board card, the other end of the load line is connected to the adapter plate, one end of the connecting line is connected to the electronic load, and the other end of the connecting line is connected to the adapter plate. According to the invention, only the current of the electronic load needs tobe controlled; the test of the server board card power supply under different currents can be completed without screwing screws to crimp and disassemble the load line in the whole process, the test efficiency is greatly improved, the adapter plate is directly and fixedly connected with the electronic load, frequent disassembly is not needed, the abrasion to the threads of the wiring port of the electronic load is reduced, and the service life of the electronic load is prolonged.

The invention relates to a method for realizing the complete compensation of line loss voltage and provides an intelligent power supply circuit for realizing the complete compensation of the line lossvoltage. The voltage value of a wirelessly transmitted detection voltage is provided by means of peripheral equipment (namely a load end) and then is converted into an analog value through a CPU; a feedback end, namely a feedback voltage, of a power supply is influenced by the real-time change of voltage difference obtained by comparison, and therefore, the power supply is controlled to adjust anactual output voltage; and finally, the effect of the complete compensation of the line loss voltage is achieved. With the method and the intelligent power supply circuit provided by the embodimentsof the invention adopted, the line loss voltage can be automatically and completely compensated in real time without considering the matching problem of line loss compensation resistance and whether the line resistance of load lines is different or not.

The invention provides a load line circuit and electronic equipment. The load line circuit is applied to the electronic equipment. The voltage value of the feedback voltage provided by the load line circuit for the switching power supply is linearly and positively correlated with the voltage value of the first voltage and the current value of the first current. The first voltage is the voltage provided for the load circuit, and the first current is the current provided for the load circuit. By arranging the load line circuit, a load line function of the switching power supply can be realized.

The invention discloses a system and a method for testing SOA characteristics of an MOS transistor, the system comprises a PC controller, an oscilloscope, a tested MOS transistor, a power supply and an electronic load meter, the input end of the tested MOS transistor is connected with the power supply, the output end of the MOS transistor is connected with the electronic load meter through a load line, the tested MOS transistor is further connected with the oscilloscope through a probe, and the PC controller is respectively connected with the electronic load instrument, the power supply and the oscilloscope through USB-GPIB (Universal Serial Bus-General Purpose Interface Bus) lines. The method comprises the following steps: obtaining SOA SPEC data of an MOS transistor; according to the obtained command and the SOA SPEC data of the MOS transistor, carrying out a full-load power-on SOA test on the MOS transistor to be tested; and according to the obtained command and the SOA SPEC data of the MOS transistor, carrying out a short-circuit power-down SOA test on the tested MOS transistor. According to the invention, the accuracy and the test efficiency of the SOA characteristic test result of the MOS transistor can be effectively improved.

The present application provides a controller for a switching power supply such as a DC-DC converter which provides an output voltage and an output current. The controller is configured to provide at least one control signal to operate the switching power supply to maintain the output voltage at a first reference voltage. The controller employs a load line compensator responsive to output current for adjusting the reference voltage employed by the compensator. The load line compensator employs one or either or both of a high pass filter or saturating element to provide a filtered/saturated value which is the value employed in adjusting the reference voltage.

The invention is applicable to the technical field of dimming, and provides a dimming circuit needing no distinguishing of input and output and a lighting system. The dimming circuit comprises a filtering module, a rectifying module, a signal control module and an MOS driving module. The rectifying module supplies power to the signal control module and the MOS driving module. When a first end of the filtering module is connected with a live wire and a third end of the filtering module is connected with a lamp, the signal control module sends a first dimming signal to the MOS driving module according to user input, and the MOS driving module outputs a dimming voltage to the third end of the filtering module according to the first dimming signal. When the first end of the filtering module isconnected with the lamp and the third end of the filtering module is connected with the live wire, the signal control module sends a second dimming signal to the MOS driving module, and the MOS driving module outputs a dimming voltage to the first end of the filtering module according to the second dimming signal. According to the invention, single-zero-/live-wire compatibility is realized, the live wire and the load wire do not need to be distinguished, the dimming circuit can work under random wiring, the operation is convenient, and the problem that normal work cannot be realized due to wrong wiring is avoided.

The invention discloses a method and device for measuring overvoltage of an alternating-current power transmission line based on a controllable phase shifter, and the method comprises the steps: constructing an overvoltage simulation analysis model through combining a controllable phase shifter model, a power grid electromagnetic transient simulation model, a power grid operation state and a power grid operation mode, and outputting simulation results under different working conditions, wherein the simulation results under different working conditions comprise power frequency overvoltage simulation data under a no-load long line and a fault-free load shedding condition and operation overvoltage simulation data under a switching-on no-load line; and performing data fitting according to the simulation results under different working conditions, the gear of the controllable phase shifter and the line length to determine a fitting function, and measuring overvoltage values under different working conditions according to the fitting function. According to the fitting function constructed by the method, the overvoltage of the power transmission line of the controllable phase shifter under different working conditions can be quickly calculated, and the measurement accuracy is improved while the calculation amount is reduced.

A computer program product and DC-to-DC converter comprising, an electronic switching device, an inductor coupled to the electronic switching device, a capacitor coupled to the inductor wherein the inductor and capacitor are chosen such that the resistance of the load line is greater than a gain minus the equivalent series resistance. A transient controller is communicatively coupled to the electronic switching device, wherein the transient controller has adaptive voltage positioning and wherein the transient controller sends a signal configured to initiate discharging the capacitor during a transient event.

The invention belongs to the technical field of analog circuits, and particularly relates to a BUCK-BOOST with a high-precision low-ripple light-load working mode. According to the scheme, an intermittent working mode is replaced by a monopulse mode, and in a light load mode, the power level only works for one cycle each time, so that voltage ripples can be reduced; the Vc signal is used for modulating the interval time of the monopulse mode, and the lighter the load is, the longer the interval time is. The purpose is that the working frequency of the power level is linearly reduced along with the load, and the audio frequency can be entered only when the load is very light. And meanwhile, as only one cycle is operated each time, the transmitted energy is small, and the audio noise is far lower than the noise of the scheme shown in the figure 3. The system modulates the interval time by using the average value of the Vc, and can ensure that the voltage precision of the VOUT does not change along with the VIN, the VOUT and the load.

The invention discloses an overcurrent protection circuit with an automatic latch function. The circuit comprises a feedback control module, a main control switch module and a current detection module which are connected in sequence, a filtering unit is connected with a power supply to output electric energy to the main control switch module, and provides stable voltage for a load, ,the feedback control module is used for receiving a signal of the current detection module and controlling the on-off of the main control switch module, the main control switch module is connected with a power supply and controls the on-off of the power supply, the current detection module is used for detecting the current of a load circuit and transmitting the signal to the feedback control module a latch unit is also arranged between the feedback control module and the main control switch, and the latch unit is used for latching a control signal output by the current detection module to the feedback control module; intelligent triggering of over-current signals is achieved through PN junction attributes of a base electrode and an emitter electrode of a triode and a detection resistor, the response time is short, and the reliability is high. The current detection sensitivity and the over-current threshold value can be adjusted through the detection resistor.

The invention discloses a light-load frequency reduction circuit of a charge pump based on current control. Problems that an existing charge pump circuit is low in light-load frequency reduction efficiency and low in reliability are mainly solved. The light-load frequency reduction circuit comprises an output current sampling circuit connected with a charge pump circuit, a highest switching frequency clamping circuit connected with the output current sampling circuit, a lowest switching frequency limiting circuit connected with the highest switching frequency clamping circuit, and a clock generation circuit connected with the lowest switching frequency limiting circuit and the charge pump circuit. In the invention, a reverse blocking tube QB of an original charge pump system is utilized togenerate a clock linearly related to an output load so that conversion efficiency of the charge pump can be kept high under a light load. And a lag problem of a clock frequency is adjusted by using an average current so that safety and reliability of the system under extreme conditions such as an abrupt change of a power supply/a load, even capacitor open-short circuit/input-output instantaneousshort ground and the like are ensured. Therefore, the circuit is suitable for popularization and application.

The invention provides a CVT secondary side harmonic monitoring abnormal data correction method, which comprises: measuring quintuple harmonic current value and fundamental reactive power of a line according to a no-load line or a no-load state existing in a line in a certain period of time; calculating the equivalent impedance of the line by using the fundamental reactive power; calculating the quintuple harmonic voltage content of the bus according to the measured quintuple harmonic current value; comparing the quintuple harmonic voltage content with the quintuple harmonic voltage content measured by CVT; and correcting the quintuple harmonic voltage according to the comparison result. According to the invention, other measuring devices are not additionally arranged, the structure is simple, the economic cost is low, and large-scale popularization is facilitated.