37results about How to "Large load current" patented technology

The invention relates to a low threshold voltage static micro relay, which comprises a movable comb and a fixed comb, a foldable spring beam and a multi-level comb connecting beam. A flat-plate capacitance is formed between the fork tines on the corresponding movable comb and the fork tines of the fixed comb. When the electric excitation is implemented, the movable comb drives the multi-level comb connecting beam to generate a transverse displacement, so that a contact contacts the fixed electrode in the circuit. When the electric excitation is removed, the elastic recovery force of the foldable spring beam allows the multi-level comb connecting beam to drive the contact to reset. The invention reduces the threshold voltage of micro relay by connecting comb level number in parallel manner and increasing number of the fork tines, thus solving the high driving voltage of the static micro relay and difficult compatibility with working circuit voltage in the prior art. The threshold voltage can be reduced to 5V, so that the driving voltage of the static micro relay can be compatible with the working voltage of common electronic circuit, thereby realizing reliable switch action under the working voltage of common electronic circuit.

The invention discloses an LDO circuit based on FVF control. The LDO circuit is characterized by comprising a biasing circuit, an FVF control circuit and a load circuit. The created circuit structureadopts the FVF control circuit as a core. Compared with an existing LDO circuit, the LDO circuit has good parameter indexes such as low power consumption, large load current, a high power supply rejection ratio and transient response, and meets the development requirement of the LDO circuit in the future. The circuit structure can be widely applied to an SoC.

This invention provides one positive and negative voltage conversion circuit, which comprises the following parts: one dropping switch mode adjustor; electrolyte capacitor, diode, output memory induction, electrolyte capacity, high frequency filter capacitor, feedback resistance network, output filter induction and electrolyte capacity. This invention adopts filter induction to eliminate voltage beam wave and load ability resulted by Buck-Boost circuit and put filter induction on negative end.

A charge pumping circuit comprises a pumping unit, first to sixth switches, a fly capacitor and an output capacitor, wherein, for a first phase, an input voltage and a first voltage respectively get access to a first end and a second end of the pumping unit to charge at least one capacitor inside the pumping unit; for a second phase, the internal capacitor of the pumping unit provides charge to the fly capacitor to generate a first output voltage through the second switch on the basis of a second voltage level through the first switch; and for a third phase, the fly capacitor provides charge to the output capacitor to generate a second output voltage through the sixth switch on the basis of a third voltage level through the third switch.

The invention relates to a metal structure electrostatic-driven MEMS relay and a preparation method thereof, belonging to the technical field of design and manufacture of relays. The metal structure electrostatic-driven MEMS relay is characterized in that the relay is a structure which is fixed and supported at two ends and is divided into an upper active pole plate 7 and a lower fixed pole plate4, the upper active pole plate is referred to as an upper pole plate, the lower fixed pole plate is referred to as a lower pole plate, and the pole plates are both made of metal, thereby being capableof reducing contact resistance. A damping hole 9 is formed on the upper pole plate, thereby being capable of reducing damping effect during switching-on and switching-off, simultaneously being conductive to releasing a sacrificial layer 8, ensuring integrity of the structure and preventing the emergence of turnover roll failure when releasing the structure. The lower pole plate adopts an upper insulating material layer 5 and a lower insulating layer 3 for integral coating, thereby being capable of effectively preventing the conduction of the upper pole plate and the lower pole plate after contact and ensuring the upper pole plate and a substrate to be insulated. The MEMS relay is characterized by low driving voltage and great load current, thereby being widely applied in the fields of electronic information, industrial control, energy management, transportation, communication, aerospace and military.

The invention provides a power charging circuit. The power charging circuit comprises a current-limiting resistor, an output capacitor, and a current-limiting control circuit, wherein a first terminal of the current-limiting resistor is connected with an input voltage positive terminal; a first terminal of the output capacitor is connected with a second terminal of the current-limiting resistor, a second terminal of the output capacitor is connected with an input voltage negative terminal and grounded, the voltage between the input voltage positive terminal and the input voltage negative terminal is an input voltage, and the voltage at two ends of the output capacitor is an output voltage; an input terminal of the current-limiting control circuit is connected with the input voltage positive terminal, an output terminal of the current-limiting control circuit is connected with the first terminal of the output capacitor, the output terminal of the current-limiting control circuit outputs a current-limiting current, the current-limiting current is limited to be less than or equal to a preset current-limiting value before charging is completed, and the current-limiting current is no longer limited after the charging is completed. The power charging circuit provided by the invention can be used for avoiding the overcurrent risk of a power supply in a charging process, and can also provide an enough loading current after the charging is completed.

Each of two inverter units has a control circuit (microcomputer). The intensity of a target waveform signal corresponding to a voltage to be outputted from each of the inverter units is successively determined by considering the effective power and the ineffective power outputted from each of the inverter units. By performing communication between the control circuits, the phases of the two inverter units are matched with each other so as to prevent output shortage of an engine or an AC generator by an abrupt load increase.

The invention discloses a low-power-consumption load current detection circuit applied to a PWM DC-DC converter, which belongs to the technical field of microelectronics. The circuit comprises a peakcurrent sensing module, a sampling hold circuit, an analog-to-digital conversion module and the like. A peak current detection module, a sampling hold circuit and an analog-to-digital conversion module are adopted, the input end of the peak current detection module is connected to a drain electrode of a freewheeling tube needing to be detected through a switch tube, then the output end of the peakcurrent detection module is connected with the input end of the sampling hold circuit, and the output end of the sampling hold circuit is connected with the input end of the analog-to-digital conversion circuit. The sampling hold circuit obtains a stable peak current signal through a switch capacitor, the stable peak current signal is converted into a digital signal VS [0: 3] through an analog-to-digital conversion module (3), and the change of the load current is shown through the change of the VS [0: 3] signal.

The invention discloses a PWM dimming type LED light-emitting system capable of avoiding inductive current overshoot, and relates to the technical field of LED dimming. When a controller detects a rising edge of a PWM signal provided by a dimming control module, the controller controls a driver to output a driving signal with a first duty ratio to a power stage circuit; then, a current of an inductor in the power stage circuit rises in a no-load-current state until the rising edge of a PWM delay signal delayed by the delay circuit for a preset duration arrives, and the PWM delay signal is switched to a stable state; a driving signal of the power stage circuit outputs several pulse signals at first with a high duty ratio; and finally, the load current is turned on after a certain delay, andthe PWM delay signal is turned off after a certain delay. Therefore, the inductor can be firstly increased to a certain degree in a no-load current state, the output voltage cannot be reduced due tothe fact that the current of the inductor does not reach a stable value, and the current overshoot phenomenon of the inductor can be effectively avoided.

Disclosed is a directly heated electric water heater without water tank, comprising an iron core junior wire packet linked to the power source and a secondary hasp. The iron core is a annular iron core wrapped tightly by metal conductor slice, at last its center has a metal conductor hollow pipe which forms heating load, and water-in end and water-out end of the heating load are separately linked with water-in pipe and water-out pipe. The metal conductor hollow pipe as heating load uses 'skin effect' of metal pipe conductor current assembling on heating load. The invention has low energy cost, fast heating effect, high efficiency and maintains water temperature high safety with only several voltages so that there is no need to think about creepage protective device and antielectricity wall for ensuring safety, and it has solved completely the problems of large volume and long waiting time exist in the present water tank-typed electric water heater.

The invention relates to a forced air cooling high thrust platypelloid type three-phase linear asynchronous motor, comprising a primary part and a secondary part, wherein the primary part comprises a primary iron core, and a winding and a cooling system, which are positioned in the primary iron core. At least one blower is installed on the upper part of a plenum chamber, both sides of the plenum chamber are respectively connected with end air chambers, the plenum chamber is communicated with the end air chambers to form an air passage, and the passage reaches the end of the winding; side wind screens are installed at both sides of the motor, a front obstacle removing device is fixed on a front end plate, a rear obstacle removing device is fixed on a rear end plate, and the winding is connected with a special variable-frequency power source by a wire connecting terminal; and the secondary part is in the shape of a strip plate, a magnetic conduction plate is welded on a support, and a current-conducting plate is bolted on the support. The cost of an urban rail car towed by the motor of the invention is low and tunnel sections can be approximately reduced by 30 to 50 percent, thus greatly increasing the towing efficiency of the car and reducing the energy consumption of the system.

The invention relates to a two-path single-live-wire switch comprising a switching power supply, an MOS tube power supply module, a relay K1 and a relay K2. The relay K1 is used for controlling power supplying or stopping of power supplying for a load LED1 by a single live wire L; the relay K2 is used for controlling power supplying or stopping of power supplying for a load LED2 by the single live wire L; the switching power supply is used for forming a loop between the single live wire L and a zero line N returning from the load LED1 when the relay K1 is disconnected; and the MOS tube power supply module is used for generating a pulse voltage drop when the relay K1 is turned off to replace the switching power supply to provide power for the switch. Because of characteristics of low internal resistance, low drive current, large load current, and low heating amount of the MOS tube power supply module and large load and good anti-impact performance of the relays, state switching becomes rapid and convenient, so that the interference on the power grid can be reduced; and the two-path single-live-wire switch can be applied to a switch position without a zero line N.

The invention discloses a heavy-current moving contact structure, and relates to the technical field of electric power. The heavy-current moving contact structure comprises two first moving contact connecting plates, two second moving contact connecting plates, first connecting sheets and second connecting sheets, and the opposite surfaces of the two first moving contact connecting plates are fixedly provided with the first connecting sheets and the second connecting sheets, and the opposite surfaces of the two second moving contact connecting plates are fixedly connected with the opposite surfaces of the two first connecting sheets and the two second connecting sheets respectively. Conductive contact plates are formed by bending the second connecting sheets and are matched with third conductive contact points, so that an effective conductive contact point is additionally arranged at the back ends of the first moving contact connecting plates and the second moving contact connecting plates, and meanwhile, second conductive contact points are additionally arranged at the front ends of the first moving contact connecting plates and the second moving contact connecting plates, therefore, the overall conductive sectional area is increased, and larger load current can be borne.

The invention discloses a power supply overload monitoring control method, which successively comprises the following steps that all acquisition and execution units are connected to an overload logicdetermination unit through an optical fiber communication network to realize real-time information interaction; the acquisition and execution units acquire the information of a host substation and uploads the information to the overload logic determination unit; the overload logic determination unit determines an overload control strategy and sends a load shedding trip result to the acquisition and execution unit of a corresponding 110kV load substation for actual execution. The method solves the problem in the prior art that the use of a spare automatic switch-in device may cause overload ofa power supply line. When used, the power supply overload monitoring control method can predict the overload and executes overload control before the spare automatic switch-in device operates in orderto avoid excessive load current on the power supply line after the power supply is restored by the spare automatic switch-in device, and avoid the power loss of the 110kV load substation caused by directly cutting off the 110kV outgoing line.