32results about How to "No arcing phenomenon" patented technology

The invention discloses a switching appliance for an AC circuit, which comprises a control unit, a detection unit, at least one switch and at least one switch driving device. The switch driving device is connected with the switch and is used for controlling the on and off of the switch; the detection unit is used for detecting a working state of the switch and/or the switch driving device; and the control unit controls the switch driving device according to a signal detected by the detection unit. That the switch is on at the contact zero-voltage moment and the switch is off at the contact zero-current moment is guaranteed, and despite of the on/off of the switch, the switch can avoid an arcing phenomenon. When the switch is on, jitter is not generated, the frequent operation of the switch is allowed and the switch cannot be damaged. Therefore, an accident caused by the switch is avoided, and the service life of the switch is prolonged. The switching appliance has the advantages of excellent performance, novel and simple structure, high reliability, high maintenance and low manufacturing cost.

A reverse connection protection method and a photovoltaic power generation system are disclosed. The reverse connection protection method is applied to the photovoltaic power generation system. A plurality of PV branches are connected to an inverter in parallel in the photovoltaic power generation system, and each PV branch is connected with a fuse or a circuit breaker in series. The reverse connection protection method comprises the following steps: judging whether the polarity of the PV branches is opposite; if the polarity of the PV branches is opposite, controlling the switching state of each switch tube in the inverter so that the positive and negative poles of each PV branch are short-circuited and thus avoiding an arc pulling phenomenon when the fuse or the circuit breaker is disconnected.

The invention discloses a simplified pre-charging synchronous switch circuit of the switched capacitor set. A simplified pre-charging electric synchronization switch circuit of a switched capacitor set consists of a one-pole synchronous switch and a two-pole synchronous switch; in the two-pole synchronous switch, only one contact is provided with a pre-charging circuit 5 and a position detection module 4; a circuit is simple and is easy to install in a middle-voltage cabinet; when the synchronous switch is put into a capacitor set, after one single-pole synchronous switch is switched off, pre-charging is performed on the capacitor set through a pre-charging circuit and the two-pole synchronous switch is switched off after charging is done; a single three-pole synchronous switch mode is adopted; three poles of the synchronous switch synchronously produce current and have no surge; when the capacitor set is cut off, three single-pole synchronous switch modes are adopted; three contacts of the synchronous switch are switched on at a zero-crossing point; a switching fast time interval achieves a second level; and power grid voltage is separated from a capacitor set when the synchronous switch is switched on.

The invention relates to a novel car electronic horn. For the existing contactless car electronic horn, an electronic circuit oscillation control sound production system is used to lead the horn to sound, electronic circuit components are too many, the structure is relatively complicated, the development and material costs are high, the manufacture process is relatively complicated and both the equipment and tooling costs are also higher. The electronic horn mainly consists of a wiring terminal (15). The wiring terminal (15) is internally provided with a circuit board assembly (10). The circuit board assembly (10) is connected with a magnetic coil (7) by a lead (13), is also respectively connected with a left male tab (11) and a right male tab (14) and is wrapped with a nylon injection structure (12) at the outside. The cathode hole of the wiring terminal (15) provided with two holes is connected with a shell (6) which inside comprises static armature with a counter bore. A diaphragm (2) is connected with moving armature (1). The invention is applied to the field of car electronic horns.

The invention provides an automatic power-off charger, and relates to a charging device, particularly an automatic power-off charger. The automatic power-off charger can automatically judge the charging time to conduct the power-off action according to the capacity of a battery. An input end, a rectifier, a transformer and an output end are connected in sequence. A power-off device is arranged between the input end and the rectifier. The output end is provided with a detection module. The power-off device is connected with the detection module. The detection module comprises a controller, a current transformer and a signal transmitter. The current transformer and the signal transmitter are connected together. The power-off device and the signal transmitter are connected with the controller respectively. The controller adopts a programmable logic controller. The power-off device comprises a contactor. The automatic power-off charger is safe and stable, and the service life of the automatic power-off charger is prolonged. The problem in the prior art that based on the timing function of a timer, the power-off action cannot be conducted according to the capacity of the battery can be solved.

The invention relates to a solar simulator charging and discharging device and method and a solar simulator. The device comprises a microcontroller, a relay switch circuit, a semiconductor switch circuit, an energy storage circuit, a constant light control circuit and a light source, and the microcontroller controls the relay switch circuit and the semiconductor switch circuit to be switched off and controls the energy storage circuit to discharge electricity to the light source through the constant light control circuit when receiving a flashing command signal, so that the light source flashes. According to the invention, rapid turn-off of the charging loop is achieved by turning off the semiconductor switch circuit; and the charging loop and the discharging loop are completely isolated by turning off the relay switch circuit, so that the influence of the charging loop on the constant-light control circuit in the discharging loop is blocked when a flash test is performed on the lightsource, and the control precision of the constant-light control circuit is improved.

The invention provides an energy saving reactive compensation cabinet based on an intelligent capacitor, belonging to an electric power control device, and comprises a cabinet body, in which a breaker, a controller and a compensating circuit are arranged. The compensating circuit comprises a plurality of sets of three-phase joint compensating circuits and single-phase separate compensating circuits; each three-phase joint compensating circuit and each single-phase separate compensating circuit both comprise a capacitor, and a switching switch used for controlling the capacitor to provide reactive compensation; the breaker is in connection with a three-phase power grid power supply, and is used for controlling power on/off states of a whole reactive compensation cabinet; the controller is in series connection between the breaker and the compensating circuit; the power supply of each phase is provided with a voltage detector and a current detector. The cabinet body is prepared by composite materials of reasonable compatibility, including: 50-60 wt% of epoxy resin, 10-25 wt% of alkali-free glass fibers, 10-25 wt% of carbon fibers, 0.5-5 wt% of flow modifiers, 1-3 wt% of heatproof modifiers, 3-5 wt% of compatilizers, 0.3-0.5 wt% of main anti-oxidants, 0.3-0.5 wt% of auxiliary anti-oxidants, and 1-3 wt% of processing auxiliary agents. The energy saving reactive compensation cabinet has sound compensation effects and a long service life, and is not easy to damage.

The invention relates to a drop-out quick breaker. The quick breaker comprises a mounting base, a vacuum arc extinguishing device, a detection control device and a conductive piece device, wherein the vacuum arc extinguishing device comprises a vacuum tube, a static contact and a moving contact which are arranged in the vacuum tube, and a traction mechanism which controls the moving contact to be disconnected and reset; the conductive piece device comprises a conductive body mechanism and a pushing mechanism fixed on the conductive body mechanism, the lower end of the conductive body mechanism is rotatably hung at the bottom of the mounting seat, the upper end of the conductive body mechanism is clamped on a conductive static contact on the mounting seat, and the conductive body mechanism comprises a conductive wire unit and a drop control unit; the pushing mechanism can drive the traction mechanism to drive the moving contact to be separated from the static contact; the pushing mechanism drives the traction mechanism and drives the falling control unit at the same time to realize falling of the conductor mechanism. The drop-out quick breaker can quickly, accurately and reliably cut off a fault line, prevents switching-on and reclosing failures of an outgoing line switch of a transformer substation, and enables a fault-free line to supply power normally.

The invention provides a novel circuit breaker. According to the circuit breaker, inherent problems such as arcing of contacts of traditional mechanical switches, ageing of contact springs and the like can be effectively solved, switching speeds are greatly increased, service lives of the switches are prolonged, and the extreme requirements of sensitive and critical loads for the power supply reliability and the electric energy quality are met. The circuit breaker comprises a circuit breaker body, a protection unit, a data acquisition unit and a controller, wherein the circuit breaker body is arranged between a line incoming end of a main power supply line and a user; the protection unit is connected with the circuit breaker body in parallel; the data acquisition unit is connected with the circuit breaker body and acquires electric signals of the main power supply line through a sensing device; and the data acquisition unit and the protection unit are connected with the controller respectively. According to the circuit breaker, 'power switching' is actually formed when the circuit breaker is turned off, the switching time reaches the millisecond level, seamless switching can be realized, the rapidity and the transient characteristic are ideal, and the extreme requirements of the sensitive and critical loads for the power supply reliability and the electric energy quality are truly met.

The invention belongs to sensor technologies and relates to a mechanical pressure annunciator or a pressure sensor or the like with metal contacts, in particular to a device for preventing arc discharge of the metal contacts. The device comprises copper foil, springs and a film, wherein the copper foil is composed of an upper copper foil body and a lower copper foil body, the film is clamped by the upper copper foil body and the lower copper foil body, the upper copper foil body and the lower copper foil body are welded with each other and are then closely bonded to the film after being welded so as to guarantee the air impermeability of the interior of the film, and the springs are arranged on the two sides of the lower copper foil body in the film. The device is welded to the metal contacts; when the metal contacts make contact with each other, the copper foil bodies in the film make contact with each other and compress the springs, and then a circuit is closed; when the metal contacts are separated from each other, the copper foil bodies in the film are separated under the action of the springs, and because helium is filled into the film, arc discharge will not occur even a current is too large. The device is simple in structure, small in size, capable of effectively preventing arc discharge and especially suitable for the mechanical pressure annunciator or the pressure sensor.