42results about How to "Stable charging current" patented technology

The invention relates to an electric car lithium battery active balancing system based on a battery management chip LTC6804. A single-chip microcomputer collects battery voltage through a battery management chip, a lithium battery active balancing scheme is determined, bilateral switches formed by connecting N-MOSFETs and P-MOSFETs in series are used in balancing circuits, bidirectional transferring of energy can be achieved, two sets of bilateral switches only need one control signal, and the system control difficulty is greatly reduced. Each battery needs to be connected with a charging allowing switch in series, wrong charging is prevented, and the safety and reliability of the system are improved. Switching between the single-single balancing circuit and the single-overall balancing circuit can be achieved by controlling two N-MOSFETs, the circuit structure is clear, and control is convenient. A double-layer balancing circuit is formed by the single-single balancing circuit and the single-overall balancing circuit, and the optimal balancing effect is achieved through a power lithium battery pack. The circuit structure is simple, cost is low, the balancing speed is high, the circuits have hierarchy, modularization is easy, stacking of the balancing circuits is promoted, and the system can be widely applied to electric cars.

The invention discloses a switch array and a display array of a display device. The display array of the display device comprises a switch array and a pixel array, wherein the switch array comprises M*N MEMS (micro-electromechanical systems) switches, M is a line number, and N is a row number; the MEMS switches in each line are respectively controlled by corresponding line driving signals, and each MEMS switch respectively outputs a corresponding row data signal under the control of a corresponding line driving signal; and the pixel array comprises M*N pixel units which are respectively and correspondingly coupled with the M*N MEMS switches, and each pixel unit displays according to the row data signal output by the corresponding MEMS switch. The switch array and the display array of the display device can reduce layout area and realizes high integration.

The present invention discloses a starting circuit of a PWM chip of a super-wide voltage auxiliary power supply. The circuit comprises a voltage switching switch circuit, a voltage detection circuit and a charging circuit; the voltage switching switch circuit comprises a MOS tube Q1, a resistor R4 and a resistor R5; the voltage detection circuit comprises a MOS tube Q2, a resistor R7 and a resistor R8; and the charging circuit comprises a resistor R1 and a resistor R2. The starting circuit of the PWM chip of the super-wide voltage auxiliary power supply can provide stable charging current for the PWM chip VCC no matter how the input voltage is changed, the relative change amount is small; and when the power supply generates faults, the chip can restarted and cannot enter a locking state, after the faults are eliminated, the chip can be restarted with no need for power-off restarting, especially the circuit works in the ultrahigh voltage, the circuit loss is less than the loss of a routine circuit.

The invention discloses a vegetable transporting vehicle with a freezing function. The vegetable transporting vehicle comprises a vehicle body. A vehicle beam is arranged on the lower portion of the vehicle body and matched with an axle frame. The axle frame is rotationally matched with an axle. Wheels are arranged at the two ends of the axle. A set of lower connecting plates are arranged on the upper portion of the vehicle body and connected with upper connecting plates through springs. The upper connecting plates are connected with a transporting box body. One end of the transporting box body is hinged to a back cover through a pin shaft. A solar cell panel is arranged on the upper portion of the outer side of the transporting box body. A set of semiconductor chilling plates and a storage battery are arranged on the upper portion of the inner side of the transporting box body. A control panel is arranged at one end of the interior of the transporting box body. The vegetable transporting vehicle with the freezing function has good damping function, can prevent the situation that vegetables are collided and damaged due to intense jolt during transportation and meanwhile has a refrigeration effect; the temperature of the vegetables can be lowered; the vegetable spoilage speed is decreased; and sufficient time is provided for vegetable transporting.

The invention provides a distance sensor and a 3D image sensor. The distance sensor comprises a photon detection circuit, a first capacitive device and a charge control module. The photon detection circuit is responsive to the reflected photon to generate a charge stop signal, and the reflected photon is obtained by reflecting a photon which is emitted by a light source by a target object. The charge control module is used for controlling the preset charge current to charge the first capacitive device in response to the charge start signal and controlling the charge current to stop charging the first capacitive device in response to the charge stop signal, and the charge start signal is generated when the light source emits photons. The amount of change in the voltage across the first capacitive device in the time window is used to determine the distance between the target object and the distance sensor, the time window is defined by the charge start signal and the charge stop signal. With the adoption of the technical scheme, the measurement precision of the 3D image sensor based on the photon detection technique can be effectively improved.

The invention discloses a charging circuit with high-voltage fast charging. The charging circuit comprises a switch module, a step-down module and a feedback module. The feedback module comprises a first detection resistor connected to an input main circuit, a second detection resistor connected to an output main circuit, and a rechargeable battery charged by the output main circuit. Input ends ofa first signal acquisition circuit, a second signal acquisition circuit and a third signal acquisition circuit are connected in parallel between two ends of the first detection resistor, the second detection resistor and the rechargeable battery. Output ends of the first signal acquisition circuit, the second signal acquisition circuit and the third signal acquisition circuit transmits output information to a control circuit. The switch module is connected between the step-down module and the input main circuit, and the switching state of the switch module is controlled by the control circuit. The invention also discloses a charging method of the circuit. The charging circuit has the advantages of a simple structure, no need for an inductor, high charging efficiency and low heat generation.

The present invention is directed to methods for the automatic charging of an electrochemical electrical energy storage device. Charging may be performed until a pre-assigned voltage increment value measured across the terminals of the storage device is reached. Recurrent periods of charging and rest may be employed, with measurements of voltage taken and voltage increment determined after the passage of an assigned quantity of electrical energy. Automatic completion of the charging process is provided for, irrespective of the design features and number of energy storage devices (e.g., capacitors) in a module, the initial state of charge and/or temperature of the storage device, or the value and/or time instability of the charging current.

The embodiment of the invention discloses a nickel-metal hydride battery pack charging device, which comprises a constant current regulation module, wherein the constant current regulation module comprises a switching power controller, a rectification unit, a detection resistor and a differential amplification unit; a power supply is connected with nickel-metal hydride batteries sequentially by the switching power controller, the rectification unit and the detection resistor; the two ends of the detection resistor are connected to the two input ends of the differential amplification unit respectively; the output end of the differential amplification unit is connected to the switching power controller, and outputs a feedback signal to the switching power controller; and the switching powercontroller controls own operating condition according to the received feedback signal to further regulate the duty cycle of switching in the rectification unit. The device can automatically regulate the output voltage of a charging circuit and stabilize a difference between the output voltage of the charging circuit and the voltage of the nickel-metal hydride battery, thereby stabilizing a charging current. Therefore, the scheme can effectively improve the charging efficiency and reduce overall calorific value.

The invention discloses a charging protection circuit and method and a switching power supply. The charging protection circuit comprises a first sampling module, used for detecting the voltage of a bus capacitor; wherein the bus capacitor is arranged between an input end first line and an input end second line of the switching power supply; an adjustable resistance module, arranged on the second line of the input end and used for keeping the charging current of the bus capacitor stable through the change of the resistance value of the adjustable resistance module; a controller, the input end of the controller being connected with the first sampling module, and the output end of the controller being connected with the adjustable resistor module for adjusting the resistance value of the adjustable resistor module according to the bus capacitor voltage. According to the invention, when the voltage of the bus capacitor rises, the charging resistance is correspondingly controlled to be reduced, so that the charging current is kept stable, and the charging efficiency is ensured.

The present invention discloses a solar power charger. The solar power charger comprises a solar power generation board, a power output mode conversion module, a function switching module, a first output voltage limiting protection module, a second output voltage limiting protection module, a mobile phone charging output module, and a computer charging output module. Through the function switchingmodule, the power output mode conversion module is configured to select to form a current loop between the first output voltage limiting protection module and the mobile phone charging output moduleor between the second output voltage limiting protection module and the computer charging output module. Compared with the prior art, by using the solar power charger provided by the present invention, a stable charging current can be better provided for mobile phones, digital electronic products, notebook computers, and the like in a low-light environment that is not directly exposed to sunlight,and the maximum stable generating current can also be provided under strong light.

The invention provides an energy storage welding machine control system and relates to the technical field of welding machines. The energy storage welding machine control system comprises a DSP main control board, a three-phase thyristor trigger board, a three-phase full-bridge rectifier module, a step-up transformer, an energy storage capacitor group, a voltage detection module and a welding transformer. The step-up transformer boosts the input three-phase alternating current. The three-phase thyristor trigger board triggers the three-phase full-bridge rectifier module under a control commandof the DSP main control board. The three-phase full-bridge rectifier module rectifies the boosted alternating current to the direct current, and the direct current is used for charging the energy storage capacitor group. The voltage detection module detects the voltage of the energy storage capacitor group in real time. When the voltage reaches the preset voltage, the three-phase full-bridge rectifier module is switched to a single-phase rectification working mode to reduce the charging current of the energy storage capacitor group. According to the energy storage welding machine control system, the number of the modules is small, the charging voltage is more accurate, and the system stability is good.

The invention relates to a transformer substation intelligent patrol robot automatic charging system, which comprises a charging pile and a patrol robot, and is characterized in that the patrol robotcomprises a patrol device and a charging chassis; the patrol device comprises a first rotary holder, a camera and a wireless communication module; the charging pile comprises a charging base and an electrode assembly. The electrode assembly comprises a first electrode and a second electrode. The first electrode and the second electrode are connected to form an included angle; the first electrode and the second electrode are electrically connected with the charging base. The first electrode and the second electrode can be close to or away from each other to adjust the included angle, the firstelectrode is provided with a first electrode conical surface, the second electrode is provided with a second electrode conical surface, and the first electrode conical surface and the second electrodeconical surface are oppositely arranged; the first electrode conical surface and the second electrode conical surface can be attached to and electrically connected with the left side surface and theright side surface of one end of the charging chassis respectively.

The invention provides an energy storage welding machine control method and a device and relates to the welding machine technology field. The energy storage welding machine control method comprises the following steps of starting an energy storage welding machine and using a boosting transformer to boost a three-phase alternating current; triggering and starting a three-phase full bridge rectification module and rectifying the boosted three-phase alternating current into a direct current; charging an energy storage capacitor group and using the rectified direct current to charge the energy storage capacitor group; and detecting the charging voltage of the energy storage capacitor group in real time, and when the charging voltage reaches a preset voltage value, switching the three-phase full bridge rectification module into a single-phase rectification mode. By using the energy storage welding machine control method, a charging current is stable, charging efficiency is high, and the stability of the welding machine can be effectively increased. By using the energy storage welding machine control device, the charging current is stable, the charging efficiency is high and cost is low.