60 results about "Circuit restoration" patented technology

The present invention is directed toward a method and apparatus for transferring data across an isolation barrier using high speed analog encoded signals. A line side circuit interfaces with tip and ring contacts on one side of a capacitive isolation barrier that isolates the line side circuit from a modem side circuit. During an on-hook state, the line side circuit converts an analog line side voltage signal to a frequency signal and then encodes the frequency signal into a high frequency pulse-width-modulated (PWM) signal. The high frequency PWM signal is transmitted across the capacitive isolation barrier to the modem side circuit. During an off-hook state, the analog line side voltage is again encoded into a high frequency pulse-width-modulated (PWM) signal for transmission across the isolation barrier. The modem side circuit recovers the transmitted PWM signal and converts it into a digital count value that represents the amplitude of the analog voltage observed at the tip and ring. The digital count value may be directly processed by a processor on the modem side or may be converted back to an analog signal.

A receiver circuit, including a multi-stage QAM de-mapper, for receiving a QAM data signal is disclosed. A first de-mapper circuit recovers a set of encoded data bits from the QAM data signal by calculating a plurality of distances between a received QAM symbol and each of a plurality of possible constellation points. A second de-mapper circuit then generates a set of unencoded data bits for the received QAM symbol based, at least in part, on the plurality of distances calculated by the first de-mapper circuit. The receiver circuit may further include a decoder circuit to decode the set of encoded data bits recovered by the first de-mapper circuit. The second de-mapper circuit may identify a subset of the plurality of possible constellation points based on a result of the decoding and select a constellation point that is associated with the shortest distance of the plurality of distances.

A short circuit protection circuit which readily recovers a relay drive circuit to an output operation state after a short circuit is cancelled while preventing the relay drive circuit from being damaged by a short circuit. The relay drive circuit outputs a drive current to a load in accordance with a first control signal. A short circuit detection circuit detects the occurrence of a short circuit at an output side of the relay drive circuit and suspends output operation of the relay drive circuit when a short circuit occurs. Further, the short circuit detection circuit intermittently transmits a recovery signal to the relay drive circuit in a certain time interval after a predetermined time elapses from when the short circuit occurs to recover the output operation of the relay drive circuit. The time interval is gradually increased whenever the recovery signal is transmitted.

The invention discloses a remote control receiving control method without alternating-current standby power consumption. The method comprises the following steps that: power is supplied to a micro-power oscillator by batteries; periodic pulses are generated by the oscillator; periodic short-term power is supplied to a remote control receiving circuit by a power gating circuit; received signals are recognized by the remote control receiving circuit when power is supplied to the remote control receiving circuit; if the received signals are invalid, processing is not performed; if the received signals are valid, a level is output to conduct an electronic switch and a stable direct-current power supply is obtained; in the first aspect, the stable direct-current power is provided for the absorption of a relay; the power supply of a controlled electrical appliance is switched on by a relay contact so that the controlled electrical appliance works; in the second aspect, the batteries are replaced by the power gating circuit, and the power is supplied to the remote control receiving circuit; when a shutdown signal transmitted from a remote controller is received by the receiving circuit, and after the shutdown signal is recognized successfully, and the electronic switch is switched off; at the moment, a voltage-stabilization filter circuit losses power, the relay releases, the relay contact is switched off, and the controlled electrical appliance stops working; and in the third aspect, a battery power supply circuit is switched on by the power gating circuit, and the initial waiting state is recovered. Simultaneously, the invention also discloses a remote control receiving circuit without the alternating-current standby power consumption.

The invention provides a method and a system for over-current protection of a power factor correction circuit. The method includes that by setting of duel protections, when current on the direct-current side exceeds a first current threshold, the first current protection is applied, and when the current on the direct-current side exceeds a second current threshold, the second current protection is applied; during the first current protection, the current on the direct-current side is not too large, and when voltage of an alternating-current power supply passes zero next time, an PWM (pulse width modulation) pulse signal is restored and outputted; during the second current protection, the current on the direct-current side is larger already, the PWM pulse signal is stopped to be outputted and is outputted again till the circuit restores to the normal state, the PWM pulse signal outputted again is an adjusted new PWM pulse signal, the circuit is enabled to run normally, and the situation of overcurrent is reduced. By the method, over-current protection is realized through software and more effective than hardware protection. Probability of PFC (power factor correction) restart is lowered, and the circuit is enabled to run more stably and is protected from being damaged by overcurrent.

An electronic device including a microprocessor, a circuit generating a clock signal, and memories of both the volatile type and the non-volatile type, incorporates a circuit for generation of a reset signal capable of detecting a stop in the oscillation of said clock signal and generating a logic signal coupled with the reset input of the microprocessor. The circuit monitors the clock signal applied to the device and, if an irregularity is detected, generate a reset signal holding the microprocessor in a safe state. The reset signal is held until the circuit generating the clock signal resumes normal operation.

Method and apparatus for bundling signaling messages to provide better circuit connection performance and scalability in circuit restoration during a network failure of communication networks.

The invention discloses an electromagnetic heating system and a working method thereof, and the system is provided with a control module, a power switch tube drive circuit module, a power switch tube module, and an LC resonant module, wherein the LC resonant module is provided with a DC input capacitor and a capacitor switching module. When an IGBT needs to be turned on, a switching capacitor circuit module is started firstly and then a DC input capacitor is cut off from the LC resonant module, thereby reducing the voltage of the collector electrode of the IGBT. Afterwards, the IGBT is started again, the IGBT is enabled to work in a soft start state, and then a DC input capacitor is connected to the LC resonant module again, and the circuit recovers to a normal state. According to the LC oscillation working principle, the DC input capacitor is cut off at a proper moment, and the voltage of the collector electrode of the IGBT is reduced at the ON moment of the IGBT, and the IGBT is enabled to work in the soft start state, thereby reducing the amplitude value of a big impact current generated at a hard on-off state, reducing the electromagnetic EMI interference and noise, and guaranteeing that the IGBT works in a safe current range.

The invention provides a rapid fault current limiter. The current limiter comprises a current limiting reactor, a super-speed mechanical switch, a switch control system, a capacitor, a lightning arrester, a current transformer and an insulation cabinet. A main controller controls the super-speed mechanical switch to be turned off and turned on. When the circuit current is in stable state, the super-speed mechanical switch is turned off, and the current limiting device shows low impedance externally. The circuit suffers from short-circuit fault or overcurrent, the switch control system detectsthat the circuit current exceeds the threshold value, the super-speed mechanical switch is turned off in a high speed and the fault current limiter shows high impedance externally, thereby achieving the function of effectively inhibiting the short-circuited current. When the first big half-wave of the current passes the zero point, the circuit recovers to operate normally.

This invention relates to a protection method for earth faults of distribution network including the following steps: 1, detecting if there is arc earth fault in three-phases of the network on-line, 2, if there is the fault in one phase, then its circuit is connected to the earth directly for a while, 3, on-line detecting if the fault happens to said phase, if so, said circuit is connected to the earth directly, otherwise returning to step 1, 4, repairing said circuit and returning to step 1. The device includes a single-chip control module, three voltage-inductors and three single-phase earth circuits, and the three voltage-mutual inductors are corresponding to one phase transmission circuit of the network.

The invention discloses a 16V10A single-circuit restoration instrument. The 16V10A single-circuit restoration instrument comprises a restoration instrument body, a plug and a bottom plate, wherein oneend of the plug is fixedly connected with a connecting wire; a jack matched with the plug is formed in the left side of the restoration instrument body; and a conducting column is fixedly connected to the right side of the inner wall of the jack. The invention relates to the technical field of restoration instruments. The 16V10A single-circuit restoration instrument is characterized in that a clamping block is fixedly connected to the front surface of a connecting block; the clamping block is clamped into a limiting groove to fix the plug, so that the phenomenon that the plug is likely to fall off when the jack is excessively loose and the connecting wire is easy to break when the jack is excessively tight can be avoided, the safety is improved, and the service life of the restoration instrument is prolonged; the restoration instrument is convenient to carry and move, free of a redundant placement table, convenient to use and high in practicality; after the clamping block is separatedfrom the limiting groove, a movable ring can push the plug to the outside of the jack under the action of a resilience force of a second spring, so that the plug can be conveniently pulled out; and the restoration instrument is simple in structure and convenient in operation.

A clock and data recovery (CDR) circuit employing zero-crossing linearizing (ZCL) technique. The circuit including a voltage controlled oscillator (VCO), an inject-locked divider (ILD), a variable delay unit, a linearized loop, a bang-bang loop, and a loop filter (LP). The differential clock generated by VCO passes through ILD for frequency dividing and variable delay unit to generate 8-phase clocks. Then using these clocks, the PDs over-sample the input data, followed by synchronization and logic operation to control the CPs output current pulses. These currents filtered by LP control the VCO to finish the loop. The circuit recovers 4 channel data and corresponding clocks of the input with low power broken-down and preferable jitter performance and locking property.

The invention discloses a voltage drop protection circuit, a backlight driving power supply and a television. The voltage drop protection circuit is connected with a flyback circuit in the backlight driving power supply; the voltage drop protection circuit comprises an AC sampling module and a switching module; the AC sampling module is used for sampling and detecting AC input voltage and outputting sampled voltage to the switching module; and the switching module is used for outputting a corresponding control signal to the flyback circuit to control the working state of the flyback circuit according to the sampled voltage, thereby controlling the flyback circuit to stop working when detecting a voltage drop and controlling the flyback circuit to return to work when detecting voltage dropreduction. The flyback circuit can be protected when a power grid unstably works and the voltage drop occurs, and automatic recovery is achieved, so that the equipment exception phenomenon is avoidedand the anti-jamming capability of the driving power supply is improved.

The invention provides a circuit overload protection and replacement protection method. The method is characterized in that firstly, when the circuit current abnormally increases, a fuse assembly in series with a docking mechanism in a rotary fuse mechanism is blown out, an input end and an output end of the docking mechanism are disconnected, and a live-wire circuit is disconnected for self protection; secondly, the fuse assembly releases the internally stored elastic potential energy at the instant of fusing and triggers an ejection mechanism, and the ejection mechanism fires and pushes theblown fuse assembly out of a roller; and lastly, a user troubleshoots a circuit and properly handles faults, the user manually pulls a handle to reset, in the process, a flange provides the motive force to a rotary driving mechanism, the rotary driving mechanism automatically drives the roller to automatically rotate by forty-five degrees and makes an adjacent fuse assembly rotate to achieve movable pressing docking with the docking mechanism, at this point, the live wire is turned on, and the circuit resumes normal operation.

The invention discloses a clock data sending circuit, a clock data receiving circuit, a clock data restoring circuit and a clock data restoring method, and relates to the technical field of clock data recovery, the sending circuit comprises: a data encoder used for receiving user data, a user clock and a reference clock, and encoding the user data according to a set encoding rule and according to edge information of the reference clock,so that the information of the user clock is hidden on the encoded data and the lengths of the data before and after encoding are the same; a parallel-serial converter configured to serialize the encoded data; and a single-ended to differential circuit which is configured to perform single-ended to differential on the serialized data and output a differential signal for restoring the user data and the user clock. According to the invention, clock lines do not need to be arranged, the clock lines are saved, the wiring complexity is simplified, additional independent processing on the user clock is not needed, the calculation code amount is small, and clock data recovery can be reliably achieved.

The invention belongs to the technical field of aviation electrical control, and discloses a direct-current bus bar short-circuit protection device and method; the device comprises a direct-current power supply, a contactor, a current detection element, and a controller. The controller is provided with a voltage detection input end, a current detection input end and a control signal output end; the direct-current power supply, the contactor and the current detection element are electrically connected in sequence; the voltage detection input end of the controller is connected with the voltage output end of the power supply bus bar, the current detection input end of the controller is connected with the current detection end of the current detection element, and the control signal output endof the controller is connected with the control signal input end of the contactor. The current detection end of the current detection element is connected with the current output end of the power supply bus bar; the electrical detection element is used for detecting the working current and the working voltage of the bus bar, and the working current and the working voltage are judged and then subjected to automatic short-circuit protection control through the computer; once the circuit returns to normal, the bus bar power supply circuit can be switched on again.

The invention provides a circuit for driving a fuse to automatically recover. The circuit is connected between an AC power supply and a load, and comprises an AC-DC unit, a detection control unit, a circuit recovery unit and a fuse unit. The AC-DC unit is connected with the AC power supply, the input end of the detection control unit is connected with the AC power supply, the circuit recovery unit is connected with the detection control unit and the AC-DC unit, and the fuse unit is connected between the detection control unit and the load. When the detection control unit detects that a first fuse is burnt out, the circuit recovery unit control a switch to be turned off, and a second fuse is connected with the AC power supply and the load; when the detection control unit detects that the second fuse is burnt out, the detection control unit controls an indication lamp to give out light. The invention further provides a drive circuit. After fuses are burnt out due to a quality problem, the other fuse automatically recovers to work, and a person can be directly reminded whether a later-stage circuit of the drive circuit is damaged.

The invention discloses a low-hardware-cost 5G frequency shift multipath TDD synchronization signal recovery system and method, and the system comprises an active antenna near-end module, an active antenna far-end module, and a radio frequency cable, and the active antenna near-end module is connected with the active antenna far-end module through the radio frequency cable. The active antenna far-end module comprises a synchronizing signal detection circuit, a synchronizing signal shaping circuit and a single-chip microcomputer, the active antenna near-end module sends TDD synchronizing signals and transmits the TDD synchronizing signals to the active antenna far-end module through a radio frequency cable, and the active antenna far-end module recovers single-path synchronizing signals through the synchronizing signal detection circuit, and the single-path synchronizing signals are transmitted to the single-chip microcomputer through the synchronizing signal shaping circuit. The low-hardware-cost 5G frequency shift multipath TDD synchronization signal recovery system and method provided by the invention have the advantages that chips with high hardware cost, such as a high-speed processor and a high-speed AD chip, are not required to be added, and the like.