1183 results about "Reverse connection" patented technology

A ground fault circuit interrupter against RCE suitable for various electrical instruments, equipments and systems fed by electrical power supply is characterized in that an erroneous reverse connection mechanism is included in its load end and the reset button comprises a reverse trip mechanism. When electric power is mistakenly connected to the load ends, the reset button will be always in trip situation and the socket on its upper lid will be kept free of electricity even the reset is attempted unless the error connection is corrected. As compared to prior art, the circuit interrupter of this invention has a simple mechanical trip structure which can effectively prevent equipment damage and personal hazard caused by reverse connection. Of course, it had successfully passed the 6 KV / 3 KA electric surge test and is highly anti-moist and anticorrosive.

The invention provides a reverse-connection preventing circuit, a reverse-connection preventing processing method and communication equipment. The circuit comprises a voltage bias resistor connected between the anode and the cathode of the power supply, a bidirectional voltage-lamping circuit and at least one field-effect tube, wherein the voltage bias resistor is connected with the grid electrode of the field-effect tube and is used for conducting and biasing the field-effect tube; the bidirectional voltage-lamping circuit is connected in parallel at two ends of the grid electrode and the source electrode of the field-effect tube and is used for taking a grid electrode and source electrode voltage clamp of the field-effect tube as a first protective voltage when inputting overvoltage in the forward direction; and the first protective voltage is the normal work voltage of the field-effect tube. The invention also provides the reverse-connection preventing processing method and the communication equipment. The invention achieves the input overvoltage protection function of the direct current input reverse-connection preventing circuit and improves the reliability of the circuit.

The invention provides a method and a system for realizing NAT traversal in a P2P network. The method comprises the following steps: a user node registers on a NAT server; the user node determines a network type of the user node as a node in a public network or a node in an internal network by interacting with the NAT server; if the user node is the node in the public network, the NAT traversal is realized through the reverse connection of an opponent node; and if the user node is the node in the internal network, the opponent node and the user node are determined not to be in the same internal network through the broadcasting in the internal network, and the NAT traversal is realized by using a UDP for hole punching and simulating a TCP mode. Compared with the prior NAT traversal system, the method for the NAT traversal in P2P network environment has the characteristics of reliability and high efficiency.

The invention discloses a charging circuit and a method for preventing charging power supply from reversely connecting in an electronic cigarette or electronic cigarette case. The charging circuit comprises a direct current input terminal, an unit for preventing charging power supply from reversely connecting, a charge management unit and a rechargeable battery. The unit is electrically connected to the direct current input terminal; the charge management unit is electrically connected to the unit and the rechargeable battery. The charging circuit and method according to these embodiments of the invention can effectively avoid the risk caused by the reverse connection of the charging power supply for the electronic cigarette or the electronic cigarette case; it also has the advantages such as low voltage drop and low power consumption.

A power supply control circuit is configured including a MOS-FET 61 connected between a DC power supply 10 and a load circuit 31 so that a body diode D300 formed between the drain and the source is in a forward direction; and a holding circuit 62 for maintaining the ON state of the MOS-FET 61 for a predetermined time when the power supply from the DC power supply 10 is stopped; where heat generation of the switching element by the surge voltage is suppressed when the surge voltage is generated to prevent breakdown of the switching element while preventing breakdown of internal circuits with respect to reverse connection of the power supply.

An electronic cigarette battery reverse connection protection device and method for using the same, comprising: a battery, a switch circuit, an alarm circuit, a discharge control circuit and a load circuit. The battery is connected with the switch circuit, the switch circuit is connected with the discharge control circuit and the alarm circuit respectively, the discharge control circuit is connected with the load circuit. The switch circuit is configured to determine whether the battery is reversely connected according to a power signal provided by the battery; when the battery is reversely connected, the discharge control circuit is turned off, and the alarm circuit is turned on and generates an alarm signal; and when the battery is correctly connected, the discharge control circuit controls the load circuit working.

An electrical interface device (10) for towing, operable to facilitate releasably coupling one or more electrical subsystems of a towing vehicle (12) and a towed vehicle, and including associated modular, removable circuitry (24). The circuitry (24) may provide overload, short-circuit, and reverse connection protection and power signal filtering. Alternative or additional circuitry may be added to support other functionality, including interfacing a brake control subsystem. Circular receptacle and flat plug connectors (20,22) are provided to accommodate without modification a variety of electrical connectors. Covers (32,33) are also provided to protect unused connectors from adverse environmental conditions.

In certain example embodiments of this invention, there is provided systems and / or methods for a streaming reverse HTTP gateway, and / or networks including the same. In such a network, a reverse HTTP gateway is located within a demilitarized zone (DMZ) disposed between public (or external) and private (or internal) networks for providing security therebetween. Requests from external clients may be streamed from the external network to the internal network over various connections and ports, including a substantially persistent reverse connection between an internal server and a reverse HTTP gateway. The reverse HTTP gateway architecture of certain example embodiments removes the need for proprietary protocols implemented between the reverse HTTP gateway located in the DMZ and the internal server located in the internal network. In certain example embodiments, the reverse HTTP gateway architecture is configured to leverage the capabilities of HTTP 1.1.

The invention relates to a load short-circuit protection circuit connected between a storage battery and a load circuit. The load short-circuit protection circuit comprises an MOS (Metal Oxide Semiconductor) tube protection circuit, a short-circuit detection circuit, a singlechip and an MOS tube switching circuit, wherein the MOS tube protection circuit is used for the reverse connection protection of the storage battery; the short-circuit detection circuit is used for detecting the short-circuit of the load circuit; the singlechip is used for sending out a switching signal according to a detection result of the short-circuit detection result; the MOS tube switching circuit is used for switching on or off the load circuit according to the switching signal; the short-circuit detection circuit comprises a comparer and a reference voltage generation circuit; the reference voltage generation circuit is connected to a first input end of the comparer; a source electrode of a first MOS tube of the MOS tube protection circuit is connected to a second input end of the comparer; and the output end of the comparer is connected to a first input end of the singlechip. The load short-circuit protection circuit is used for a load short-circuit protection circuit of a solar controller, has low cost, cannot increase the impedance of a load loop and has the function of eliminating instantaneoushigh voltage.

The invention discloses a charging circuit and a method for preventing charging power supply from reversely connecting in an electronic cigarette or electronic cigarette case. The charging circuit comprises a direct current input terminal, an unit for preventing charging power supply from reversely connecting, a charge management unit and a rechargeable battery. The unit is electrically connected to the direct current input terminal; the charge management unit is electrically connected to the unit and the rechargeable battery. The charging circuit and method according to these embodiments of the invention can effectively avoid the risk caused by the reverse connection of the charging power supply for the electronic cigarette or the electronic cigarette case; it also has the advantages such as low voltage drop and low power consumption.

Apparatus and methods are disclosed herein for a reverse-connection STT MTJ element of a MRAM to overcome the source degeneration effect when switching the magnetization of the MTJ element from the parallel to the anti-parallel direction. A memory cell of a MRAM having a reverse-connection MTJ element includes a switching device having a source, a gate, and a drain, and a reverse-connection MTJ device having a free layer, a fixed layer, and an insulator layer interposed between the free layer and the fixed layer. The free layer of the reverse-connection MTJ device is connected to the drain of the switching device and the fixed layer is connected to a bit line (BL). The reverse-connection MTJ device applies the lower IMTJ capability of the memory cell caused by the source degeneration effect to the less stringent IMTJ(AP->P) while preserving the higher IMTJ capability for the more demanding IMTJ(P->AP).

The invention provides an LED light-dimming driving circuit comprising a short-circuit protection circuit, a ballast output circuit and a constant-current adjusting circuit. The LED light-dimming driving circuit is characterized by further comprising a driving switch circuit. The constant-current adjusting circuit comprises a single-chip microcomputer U1, a current sampling resistor R4, a light-dimming potentiometer W1 and a pressure parting resistor R2. A signal output pin of the single-chip microcomputer U1 outputs PWM (pulse width modulation) pulse signals, so that a driving triode Q2 and a switch triode Q1 are cut off or put through and lighting of LEDs can be controlled. The single-chip microcomputer U1 adjusts the PWM pulse signals output by the signal output pin according to feedback current. By the LED light-dimming driving circuit which is low in cost, simple in structure and efficient, the LED circuit is adjustable in luminance when at constant current state. Meanwhile, overheat protection, short-circuit protection and reverse-connection prevention function are added to the LED light-dimming driving circuit, so that stability, reliability and universality of the LED light-dimming driving circuit are improved.

A voltage sensing device with which high-precision voltage sensing is possible without acquiring a unique correction constant for each device. A pair of voltage input nodes NCk and NCk-1 are selected from n+1 voltage input nodes NC0-NCn in switch part 10, and the selected voltage input nodes NCk and NCk-1 are connected to inspection input nodes NA and NB. Here, voltage input nodes NCk and NCk-1 and inspection input nodes NA and NB are connected in two types of patterns of different polarity (forward connection, reverse connection) under the control of control part 50, and digital data S30 for the two sensed voltage signals S20 generated in the two types of connection patterns is input to sensed data processing part 40. With sensed data processing part 40, sensed voltage data S40 that represents the potential difference between voltage input nodes NCk and NCk-1 is generated according to the difference in the two sensed voltage signals S20.

The invention, which is applicable to the field of circuits, provides a charging circuit and a charger. The circuit comprises an electromagnetic compatibility circuit, a full-bridge rectifier and filter circuit, a main transformer transformation circuit, a rectifier and filter circuit, a reverse connection protection circuit, a sampling circuit, a feedback circuit and a PWM control circuit; the electromagnetic compatibility circuit is used for carrying out the high-frequency filtering of alternating-current input; the full-bridge rectifier and filter circuit is used for rectifying alternatingcurrent into pulsating direct current; the main transformer transformation circuit is used for storing and releasing electric energy according to PWM control signals; the rectifier and filter circuitis used for rectifying, filtering and outputting current; the reverse connection protection circuit is used for receiving regulated current and shutting off the charging circuit when the poles of a battery are reversely connected; the sampling circuit is used for acquiring voltage signal output; the feedback circuit is used for comparing the voltage signal with the reference voltage and then outputting a feedback signal; and the PWM control circuit is used for receiving the feedback signal and outputting a PWM control signal. By shutting off the charging circuit when the poles of the battery are reversely connected, the invention prevents the damage of the charger and the battery when the chargeable battery is reversely connected.

Establishing a connection is disclosed. A first communication link with a perimeter gateway located external to a private network firewall but behind a perimeter network firewall is initiated. A request to allow the connection from a requestor that has requested the connection to an internal server via the perimeter gateway is received. A second communication link with the internal server protected by the private network firewall is initiated. The connection is allowed at least in part by associating together the first communication link with the second communication link.

This is a constructive method used to underground; it is a semi-reverse practice inverse join method. Its steps are: After dig earthwork set up the safe guard wall (1) and according following steps: To make temporary sand trough joint (2), it is composed by the wedge trough (3), pad layer (4) and filled layer (5), on the sand trough joint (2) install pattern plate (10), vertical direction reinforcing rod (6), and horizontal direction reinforcing rod (11), to fix the pattern plate by the scaffold, on the pattern plate surface open a pair holes, one end is fixed on the safeguard wall, other end is fixed on the scaffold by binder bolt (7); support rod (9) sustain the scaffold; on the pattern-plate top end, to make 'false cattle-leg' pouring opening, to pour cement slurry: after pouring cement begin to maintain, after maintain dismantle pattern plate and repeat the above steps to the bottom.

The present invention relates to a safety apparatus and a protection method of a secondary battery, which can prevent explosion and fire of the secondary battery using a switch or a rupture switch attached on the outside of the secondary battery if a swelling degree of the secondary battery reaches a predetermined value when the secondary battery is swelled due to abnormal usage such as overcharge, short-circuit, reverse-connection and heat-exposure of large-capacity lithium polymer battery.

There is provided a matrix converter apparatus including both functions of outputting a step up voltage and outputting a step down voltage. In a matrix converter apparatus for directly connecting respective phases of a three phase alternating current power source (1) and respective phases of an output side by a bidirectional switch constituted by IGBT transistors or the like connected reversely in parallel therewith, controlling to output an alternating current power source voltage by a PWM control based on an output voltage instruction, and outputting an arbitrary direct current or alternating current voltage, respective reactors (61), (62), (63) inserted to be connected between the respective phases of the polyphase alternating current power source 1 and the bidirectional switches are included, and by controlling to ON / OFF the bidirectional switches, terminals of two or more of the reactors on a side of the bidirectional switch are shortcircuited, and thereafter opened to thereby step up an output voltage of the matrix converter apparatus. Further, when the terminals are switched from being shortcircuited to being opened, conduction paths of currents flowing in the respective reactors which have been shortcircuited are ensured by controlling to ON / OFF the bidirectional switch group (5) and a capacitor group (7).

The present invention discloses a judgment method for a single phase power wiring, which solves the problems of reverse connection of the front line and the null line caused by a possible failure in single phase power supply. The safety performance of the circuit board is improved on the condition that the hardware cost is basically not increased. The specific technical proposal is that a front line terminal, a null line terminal, a ground wire terminal and a phase detecting circuit which is used for detecting the open-phase or anti-phase of a three-phase alternating-current supply are arranged on an outdoor unit main circuit board; wherein, the phase detecting circuit comprises two phase detecting branches. The input end of a first phase detecting branch is connected with the null line terminal through a wiring. The input end of a second phase detecting branch is connected with the ground wire terminal. Whether the front line and the null line are accurately connected is judged by detecting the state of the electric signal exported by the second phase detecting branch. In addition, the present invention also discloses a single phase power supply phase detecting circuit which is used for detecting and judging whether the front line and the null line are accurately connected during single phase power supply.

The invention is suitable for the field of the electronic circuit and provides a circuit for preventing reverse connection of a power supply. The circuit for preventing reverse connection of the power supply comprises an MOS tube control unit and an MOS tube, wherein the MOS tube control unit is connected between a positive input end of the power supply and a grid electrode of the MOS tube; a source electrode of the MOS tube is earthed; and a drain electrode of the MOS tube is connected with a negative input end of the power supply. The circuit for preventing reverse connection of the power supply, which is provided by the invention, can effectively prevent reverse connection. An on resistance of an MOS is small (can be milliohms) so as to reduce the power consumption of a main current circuit, improve efficiency of the whole circuit, reduce heat generation and improve reliability of a product applying the circuit.

The invention discloses an enterprise intranet access method based on a reverse connection and an application layer tunnel. A system for implementing the method is divided into an extranet terminal used by a user, a relay server deployed in a public network, a gateway server deployed in an enterprise intranet and an application server deployed in the enterprise intranet according to communicationroles; except the extranet terminal and the relay server, the other layers establish connections by using a reverse mode in which a message receiving end sends a request to a sending end, and an application layer protocol is used as a data transmission tunnel; the user sends the request to the relay server through the extranet terminal when accessing the enterprise intranet, the relay server sendsinformation to a target gateway server after verifying the information, the gateway server sends the information to a target application server, the target application server executes the request, and the request result is returned to the extranet terminal through the gateway server and the relay server in sequence. By adoption of the enterprise intranet access method provided by the invention, safe and efficient access to the enterprise intranet by the extranet terminal is achieved.

The invention discloses a method and a system for supplying power to a mobile terminal. In the method, two power supply channels 1 and 2 of a programmable power supply are used for supplying power supply voltages needed by a battery terminal and a charging terminal of the mobile terminal when the mobile terminal works normally. The method particularly comprises the following steps that: the character that the charging terminal of the mobile terminal also generates startup current when the loaded power supply voltage is insufficient is utilized, and before electricity is supplied to the mobile terminal formally, whether a power supply terminal of the mobile terminal is correctly connected is judged by outputting a test voltage in advance and detecting the startup current, so the power supply safety of the mobile terminal is ensured, the problem that the mobile terminal is damaged due to reverse connection of the power supply terminal is avoided, furthermore, the generation of fault machines is reduced, the production cost is reduced, and the first pass yield rate of production is improved. The method for power supply has a simple design, can provide conveniences for a line operator to make judgments, and is suitable for popularization and application in related mobile products such as mobile phones, MP4 and the like.

The invention discloses a direct current power supply input reverse irrigation prevention circuit and method. The circuit comprises a reverse connection prevention circuit, a soft start circuit and a sampling control circuit. The reverse connection prevention circuit comprises a reverse connection prevention metal oxide semiconductor field effect transistor MOSFET. The slow start circuit comprises a slow start MOSFET. The sampling control circuit samples voltage between the drain and the source of the slow start MOSFET. When the voltage between the drain and the source of the slow start MOSFET is less than the reference voltage, the reverse connection prevention MOSFET is controlled to switch off. According to the invention, current reverse irrigation is avoided when input short circuit occurs or input voltage rapidly drops; when a DC / DC converter uses a full bridge circuit, the increasing of the voltage stress of the secondary synchronous rectifier MOSFET drain and source of the converter and the damage of the MOSFET are avoided; when reverse lightning surge occurs in an input port, current reverse irrigation is avoided; and power supply output power-off caused by module input capacitor power-off is avoided.

The invention discloses a method for remote management of customer premises equipment (CPE) by an automatic configuration server (ACS) through a private network, which comprises the following steps that: the CPE sends registration messages to the ACS through NAT, the NAT packages the registration messages, and when the ACS confirms that the CPE is in a private network after receiving the registration messages, the IP address of the CPE is converted into a public network IP address through NAT conversion, and a backward link request message are sent to the CPE through the public network IP address, thereby realizing the remote management of the CPE. The invention also discloses a system for remote management of the CPE by the ACS through a private network. When in use, the method and the system can reduce the load of the equipment, simplify the processing, and improve the efficiency of the ACS in the remote management of the CPE.

A Tee piece that functions as device to direct dual, alternating respiratory therapies to a patient. It has a centrally located low pressure actuated one way valve that connects the inhalation and exhalation paths to the specific therapy devices. The gravity hung valve has a low pressure activation and an offset, angled seat that allows the valve itself to be completely removed from the path of the medicated aerosol particles so as to minimize the potential for particle condensation by collision with the valve. The valve forms a holding chamber for the medicated aerosol increasing the efficiency of the nebulizer cycle. The physical design of the Tee piece's outside surface prevents reverse connection, which is a common problem and the oval shape of the PEP port eliminates blow-off of the PEP device by excessive back pressure.

A method for judging the reverse connection of a flow sensor comprises the steps of: collecting a time sequence of pressure intensity x1, x2, x3 and x4 at four consecutive sampling points of time and the flow value S corresponding to that time sequence as basis for judgment; calculating three variables dx1=x1−x2, dx2=x2−x3 and dx3=x3−x4; judging a reverse connection of the flow sensor and giving an alarm signal when any one of the two instances appears: 1) x1, x2 and x3 are all smaller than zero and x1 and x3 are equal to or greater than x2, and flow value S is smaller than a predetermined first threshold value f1; 2) dx1, dx2 and dx3 are all greater than zero and dx1 and dx3 are smaller than or equal to dx2, and flow value S is greater than a predetermined second threshold value f2.

The invention provides an electricity meter cross-room wiring detection device which comprises a signal providing host and a signal feedback slave, wherein the signal providing host comprises at least one signal output circuit, input end of power transmission lines of different users are connected by the signal output circuits, the signal feedback slave comprises a signal feedback circuit and is connected into output ends of the power transmission lines of users in different rooms sequentially, and the working states of the power transmission lines are detected. The invention further provides a detection method based on the electricity meter cross-room wiring detection device, the signal providing host and the signal feedback slave are mutually matched for communication, so that the working states power transmission lines of the users are detected, and conditions of cross-room, reversed connection of a zero wire and a fire wire and the like of the power transmission lines are avoided.

The invention relates to a high-power battery charging device capable of preventing reverse current charging and battery reversal. The output end of a rectifying unit is connected with a filter unit; the output positive end of the filter unit is connected with a reverse charging preventing diode; the output negative end of the filter unit is connected with a reverse connection preventing switch and a detection circuit diode; a control circuit unit is connected with the reverse connection preventing switch to control turn-on and turn-off of the reverse connection preventing switch; the negative electrode of the reverse charging preventing diode is connected with a first sampling circuit; the negative electrode of the detection circuit diode and one end of the reverse connection preventing switch are connected with a second sampling circuit; the first sampling circuit and the second sampling circuit are connected with the control circuit unit; and the control circuit unit and the filter unit are grounded. Voltages of positive connection and reverse incorrect connection of a battery are detected by two paths of voltage detection respectively, then three conditions that the battery is not connected, accurately connected and inaccurately connected are identified, and the control circuit unit carries out three operations according to the three conditions, so that various accidents of electric shock of workers, short circuit of the battery and the like are avoided.

The invention relates to a frequency converter input / output reverse connection detection protection method and a frequency converter input / output reverse connection detection protection device. The method comprises the following steps of: 1, detecting the output current of a frequency converter by using an output current detection circuit during initial electrification; 2, comparing an output current value detected in the step 1 with a reference current value by using a first comparison module of a central processing unit (CPU); 3, blocking a driving circuit of the frequency converter by using a first control module of the CPU; 4, detecting the direct-current bus voltage of the frequency converter; 5, judging whether the direct-current bus voltage detected in the step 4 is greater than a current limiting switch switch-on threshold value of a charging current limiting circuit or not by using a second comparison module of the CPU; 6, charging a high-voltage electrolytic capacitor, and continuously limiting charging current by using the charging current limiting circuit simultaneously; and 7, outputting a current limiting switch action signal by using a second control module of the CPU. By the method and the device, the technical problem that an inversion unit power device can be damaged by extremely high charging current generated during the input / output reverse connection of the frequency converter is solved.