52results about How to "Reduce load current" patented technology

An object of the present invention is to provide an electric power steering device which detects each phase current of a motor with a single-shunt current detection circuit, and reliably detects failures (abnormal states) in the current detection circuit with a simple configuration, thereby enhancing safety. The electric power steering device is provided with: a single-shunt resistor connected to an inverter; a control motor current detection circuit which is connected in a forward direction to both ends of the shunt resistor and detects the phase currents of a motor as control motor current detection values for assist control; and a diagnosis motor current detection circuit which is connected in a reverse direction to both ends of the shunt resistor and detects failures in the control motor current detection circuit. The electric power steering device detects each phase current of a motor with the single-shunt scheme to perform assist control, and has two systems of circuits which amplify the voltage across the ends of the shunt resistor.

The invention relates to a dynamic current sharing control method and circuit. A control circuit comprises a plurality of power modules connected in series, a main control panel, sub control panels and control switches, wherein the sub control panels and the control switches are in same numbers of the power modules, dynamic current sharing reference data is transmitted between the main control panel and the sub control panel of each power module through communication, through each control switch at an output end, multiple output is achieved by each power module, and dynamic current sharing control after arbitrary numbers of the power modules are connected in series is achieved. The invention also comprises another control method and two control circuits. By adopting the control method and circuit disclosed by the invention, a current sharing state can be reached after the plurality of power modules are arbitrarily combined and randomly connected in series, and the reliability of current sharing is further guaranteed.

The invention discloses an arc extinguishing mixed transfer switch which comprises a mechanical switch and a first thyristor branch circuit, wherein the first thyristor branch circuit is connected in parallel with a first contact point branch circuit of the mechanical switch; and the first thyristor branch circuit comprises a first bidirectional thyristor unit and a first non-polarity capacitor connected in series. The invention also discloses a switch mixed transferring method for arc extinguishing of the mechanical switch. Because the first non-polarity capacitor is arranged, a low-powered thyristor can be selected, thereby greatly reducing the cost of the thyristor; and simultaneously, when the thyristor has a short circuit fault, the first non-polarity capacitor can substitute the thyristor to play the arc extinguishing affect, thereby greatly decreasing load current and reducing the influence of the thyristor fault on load.

The invention relates to the field of electric power supply and discloses a method and device for controlling switching to a standby transformer. The method comprises the following steps: according to correlation parameters of bus voltages and standby voltages, determining whether to start switching to the standby transformer; when it is determined that the switching to the standby transformer is started, transmitting a closing instruction to a surge suppressor and a circuit breaker; after the closing instruction is received through the surge suppressor, monitoring the bus voltages so as to output closing signals to the circuit breaker at the transmission moment when surges during closing are enabled to be smallest; and receiving the closing instruction and the closing signals through the circuit breaker, and according to the closing instruction and the closing signals, performing closing so as to realize the switching to the standby transformer. According to the invention, loss caused by no load of the standby transformer can be avoided, and energy can be saved; and impact on the standby transformer due to simultaneous superposition of transformer excitation surges and motor self-startup load currents can be reduced.

The invention provides a ripple elimination circuit, a ripple elimination method and an LED control circuit applying the ripple elimination circuit. The ripple elimination method comprises the following steps that: the ripple elimination circuit obtains a detection signal representing the voltage at a low potential end of a load, and when the detection signal is less than a first threshold value,load current decreases; when the detection signal is greater than a second threshold value, the load current increases; and when the detection signal is greater than or equal to the first threshold and less than or equal to the second threshold, the load current remains unchanged. The ripple elimination effect is remarkable, and the load current is more stable.

The invention discloses an electric hair trimmer comprising a cutter head unit, a motor, a rotating shaft, and a power source. The cutter head unit comprises a fixed cutter unit, a moving cutter unit and a fine adjustment mechanism. The moving cutter unit is arranged above the fixed cutter unit. The moving cutter unit comprises a moving cutter and a moving cutter drive rack. The fine adjustment mechanism comprises an adjusting block and a torsion spring arranged on the same. Two ends of the torsion spring are inserted onto the moving cutter drive rack, so that the moving cutter has a degree of freedom of motion, rocking left and right and sliding back and forth relative to the fixed cutter unit. The upper surface of the fixed cutter unit is provided with a grinding bar or a grinding layer. The grinding bar or grinding layer is disposed on the upper surface of the fixed cutter unit, so that the trimmer has the function of blade sharpening; when the shearing sharpness of the cutter head decreases, the cutter head can be ground with the grinding bar or grinding layer and kept sharp, hair-cutting efficiency is improved, the service life of the cutter head is greatly prolonged, and cost is saved.

The invention relates to a multiple-chip array type chip-on-board (COB) inversely-installed eutectic packaging structure and method. The multiple-chip array type COB inversely-installed eutectic packaging structure comprises a ceramic heat-radiating substrate, a fluorescent powder and silica gel mixed packaging layer and light-emitting diode (LED) chips, wherein an insulating layer is arranged on the upper surface of the ceramic heat-radiating substrate, a circuit conductor layer is arranged above the insulating layer, and multiple LED chip connecting units are installed on the upper side of the ceramic heat-radiating substrate. Each LED chip connecting unit consists of a bonding layer, an LED chip and a gold wire shared by thermo-sonic keys, wherein the positive pole ends of the chips are in eutectic bonding with the bonding layers and connected with the circuit conductor layer, and the negative pole ends of the LED chips are connected with one end of the circuit conductor layer on the front side of the substrate through the gold wires. The multiple-chip array type COB inversely-installed eutectic packaging structure and method has the advantages of being excellent in heat-radiating effect and capable of avoiding the problems including chip defects or reduced luminous efficiency and the like caused by the different expansion degree of the chip and the substrate with heat, facilitating wire arrangement, reducing bonding temperature, improving the reliability performance and solving the problems of false welding and unsoldering of wires.

The invention relates to power compensation equipment, in particular to an intelligent load balancer. The intelligent load balancer comprises a sampling module, a main power supply input end, a voltage regulator module, an isolation transformer, a power supply detection module, a datum grounding end, a main controller, a compensation switch, a compensation module, a driver and a main power supplyoutput end; the driver is arranged between the isolation transformer and the main power supply output end; the driver is positioned between the compensation switch and the main power supply output end; the driver is connected in parallel with a driver isolation switch; one end of the driver isolation switch is connected between the input end of the driver and the compensation switch; and the otherend of the driver isolation switch is connected to the output end of the driver. The intelligent load balancer has the beneficial effects that coordinated operation of variable frequency speed regulation and power compensation functions can be implemented; and the intelligent load balancer has a very good energy-saving effect.

The invention relates to an incremental encoding type gas stove control device comprising a fixed box, an incremental encoder, a speed reduction motor, an inner sleeve ring, a gas switch rotary knob and a control module. A clamping groove is formed in an object containing box structure part of the fixed box. The lower end of the fixed box is fixedly installed on a gas stove tabletop. The incremental encoder is of a hollow structure and contains a hollow shaft. The outer wall of a gas fire regulation rod is sleeved with the hollow shaft. A speed reduction motor rotor is aligned and fixedly connected with the axis of the gas stove fire regulation inner rod. An incremental encoder shell and a speed reduction motor stator are both fixed to the inner wall of the inner sleeve ring. A wire grooveis formed in the inner wall of the inner sleeve ring. A limiting stopper is inserted in the clamping groove of the fixed box. A rotary knob inner groove is formed in the lower end of the gas switch rotary knob and is installed in a sleeving manner together with the upper end of the speed reduction motor rotor.

The invention discloses a control method of eliminating static rolling torque in a band and strip rolling mill. The control method comprises the following steps of: step one. starting the rolling mill, causing silicon controlled rectifier trigger pulse control to be in an opening enabled state, and starting the rolling mill for rolling under the control of a direct-current speed adjusting controller according to the speed given value P1, wherein the previous five times stopping of the present rolling period aims at changing a rolling direction, namely causing the rolling mill to be in a zero speed working state; during reverse rolling, the direct-current speed adjusting controller quickly reduces forward current and establishes reverse current as long as the given value of the rolling speed P1 of the rolling mill is negated, controlling a main motor of the rolling mill to carry out reverse rolling according to the set speed till completing the last rolling pass in the present rolling period; and step two. sequentially stopping, losing tension, opening cleaning between rolls and discharging coils, thereby ending the whole rolling period of a steel coil. The control method greatly prolongs the service life of each impacted part, improves the working efficiency of the rolling mill and increases the yield of steel coils.

At the time of using a general-purpose cell (33), in a cell changing switch (20) provided in a remote controller, a terminal (a) and a terminal (b) are connected to each other, and a terminal (d) and a terminal (e) are connected to each other by means of a slider switch (20a). A microcomputer (30) can be supplied with power from the general-purpose cell (33) by having the terminal (d) and the terminal (e) connected to each other. At that time, by having the terminal (a) and the terminal (b) connected to each other, a solar cell (12) is not connected to the microcomputer (30), and the lithium primary cell (32) is not connected to the microcomputer (30), either, with a terminal (f) not connected to the lithium primary cell. As a result, the connection between the solar cell (12) and the microcomputer (30) and that between the lithium primary cell (32) and the microcomputer are completely interrupted.

The invention discloses a start accessory power supply circuit, including a voltage regulator circuit providing a reference voltage, a current circuit connected with the voltage regulator circuit, wherein the current circuit has an output port. The invention is characterized in that: the voltage regulator circuit includes at least two voltage regulator tubes connected mutually, and a controller is connected with at least one voltage regulator tube in parallel, the controller is possible to be in the short circuit condition or the open circuit condition. The controller is a switching tube, the control input terminal of the switching tube is connected to the guard signal output terminal of an outside circuit, and the output port of the switching tube is connected with the both ends of the voltage regulator tube in parallel. The invention uses two or above voltage regulator tubes in series connection to provide the reference voltage, controllers are connected with part of voltage regulator tubes in parallel, so that the reference voltage output value of the entire voltage regulator tubes circuit may be cut, when the outside module has the protection movement, the output voltage of the accessory power supply for starting will be reduced, the load current provided for starting the accessory power supply will be reduced, so as to reduce the primary device power loss and the heat dissipating capacity.

The invention discloses a method for forecasting the turn-off time of a contactor by a battery management system of an electric automobile. The method comprises the following steps that: a, the battery management system detects a fault that a power battery generates in real time and sets the overflow time of a turn-off timer of the contactor; and b, the overflow time of the turn-off timer of the contactor is sent to an entire-automobile CAN (controller area network), and the entire-automobile CAN controls each node to complete current reduction response within the overflow time of the timer of the contactor. The method has the advantages that: 1, by sending the forecasted turn-off time of the contactor and the fault information of the power battery to the entire-automobile CAN, the battery management system notifies and requires relevant nodes such as an entire-automobile controller and a motor controller to complete the current reduction response within estimated time in advance; the load current in a turn-off process is decreased; and the service life of the contactor is prolonged; and 2, the risk of generating a serious safety problem is reduced.

The invention relates to a light-load current detection device and method based on a light-load mode of a switching power supply. The device comprises the switching power supply and a timing module. The switching power supply comprises a light load mode detection module and a switching power supply control module. The light load mode detection module compares the output voltage of the switching power supply with a reference voltage, and outputs a sleep signal to the switching power supply control module according to a comparison result so as to control the output of the output voltage of the switching power supply. The timing module receives the dormancy signal and outputs a light load current confirmation signal when the dormancy signal indicates that the switching power supply is in a light load mode for more than a preset time. According to the invention, no extra sampling resistor sampling circuit or packaging cost needs to be added, no dependence on the sampling circuit precisionis needed, smaller load current can be detected, the switching power supply is intermittently turned on, the equipment always works in a high-efficiency mode before dormancy, and the endurance of theequipment is improved.

To decrease a maximum load current in a combustion control circuit using as a power source a power source circuit for converting an alternating current from a battery or a commercial power source into a direct current. A combustion control circuit comprises a valve opening circuit 23 for forcedly opening a safety valve 14 under an electromagnetic force, a holding circuit 24 for opening and holding the safety valve 14, an ignition circuit 25 and a flame rod circuit 26. During an ignition operation, the valve opening circuit 23 is operated for a short time, and the holding circuit 24 and the ignition circuit 25 are operated for a prescribed ignition time. Then, after the operation of the valve opening circuit 23 is completed, the flame rod circuit 26 is operated.

The invention provides a voltage conversion circuit and a power converter. The voltage conversion circuit comprises a main circuit, a feedback circuit, a control circuit, a clamping module and a driving unit, the control circuit is connected with the driving unit and the clamping module and is used for comparing the feedback voltage with the first reference voltage and outputting a second signal when the feedback voltage is higher than the first reference voltage; the clamping module is used for boosting the first voltage converted based on the feedback voltage and fixing the first voltage to a first preset voltage based on the second signal; and the driving unit is electrically connected with the control end of the switch module and is used for adjusting the driving mode of the switch module into a pulse cross-period modulation mode based on the second signal and controlling the switch-on and switch-off of the switch module. Under the light load condition, the voltage conversion circuit is controlled to enter the pulse cross-period modulation mode, the switch module can be driven to be switched on and switched off at a low frequency, the power consumption of the switch module can be reduced, and the power supply voltage conversion efficiency can be improved.