114results about How to "Constant output voltage" patented technology

A high efficiency control circuit for operating a switching regulator is provided. The switching regulator can regulate an output voltage no matter the input voltage is higher, lower, or close to the output voltage. The switching regulator has first, second, third and fourth switches. The control circuit can operate the switching regulator in buck mode, boost mode, or buck-boost mode. In a buck-boost mode, the control logic drives the four switches in an efficiency sequence for reducing energy consumption during the switch transition, on the other side, resistive loss owing to the energy transfer phase is also minimized. Furthermore, the invention is capable of control duty cycle limitation to fit the consideration of the linearity of the converter.

The invention discloses a switching voltage stabilization circuit and a voltage feedback circuit as well as a voltage feedback method of the voltage feedback circuit. The switching voltage stabilization circuit comprises a switching circuit for converting input voltage into output voltage and output current; the voltage feedback circuit comprises a resistance voltage sharing circuit for sampling the output voltage, a line loss detection circuit and a controlled current source circuit; a compensation control signal is supplied to the output end of the line loss detection circuit and is in direct proportion to the output current; the controlled current source circuit is provided with a control end, a grounding end and an output end; the control end is coupled to the output end of the line loss detection circuit and receives the compensation control signal; the grounding end is grounded; the output end supplies compensation current; and the output end of the resistance voltage sharing circuit is connected with the output end of the controlled current source circuit to supply feedback voltage which represents backward output voltage.

The invention provides a universal rechargeable battery formed by adopting a lithium-ion battery and a control method thereof. The universal rechargeable battery comprises an external packing casing, as well as a charging/discharging controller, a positive electrode welding piece, the lithium-ion battery and a negative electrode end cover which are sequentially assembled in the external packing casing in a press fit manner, wherein the charging/discharging controller comprises a charging/discharging controller casing as well as a charging/discharging control circuit welding body and a charging/discharging controller support, which are arranged in the charging/discharging controller casing; a lithium-ion battery charging/discharging control circuit is welded on a charging/discharging control circuit welding body; the lithium-ion battery charging/discharging control circuit comprises a lithium-ion battery charging control circuit welded on a circuit board, electrically connected with the lithium-ion battery and the positive electrode end cover respectively and further electrically connected with the negative electrode end cover via the charging/discharging controller casing and the external packing casing, a lithium-ion battery detection and control circuit, and a DC-DC step-down voltage stabilizing discharging circuit.

The invention discloses a charge pump control circuit, which comprises a power detection circuit, a logic control circuit, a charge pump module, an oscillator, comparators, an operational amplifier, divider resistors R1 and R2, and a load capacitor CL, wherein the power detection circuit divides a power voltage into a voltage of less than 2.7 V, a voltage of 2.7 to 4.6 V and a voltage of more than 4.6 V, detects that the power voltage is in a certain range, and then inputs information to the logic control module in a digital signal form such that a gain mode of a charge pump is determined, and maximum power is obtained; and the comparators are COMP 1 and COMP2, negative input ends of the two comparators are connected with an output end of the operational amplifier, and two saw-tooth waves with different phases are respectively input into positive input ends of the two comparators. Compared with the conventional hopping cycle control mode, the charge pump control circuit has the advantage that: a ripple wave of an output voltage is greatly reduced. Compared with the conventional linear regulation mode, the charge pump control circuit has the advantages that: the area of a power tube is greatly decreased, so that the ripple wave of the output voltage is greatly improved on the basis of no increase of the cost of a chip.

The invention relates to a control circuit of a voltage-type regulator and a control method of the same. According to the control method of the voltage-type regulator, feedback signals of represented output voltage and ripple wave signals which are the same with a duty ratio in phase position are overlaid mutually, so that first voltage signals are generated; through comparison between the first voltage signals and an upper limit reference voltage and comparison between the first voltage signals and a lower limit reference voltage, corresponding comparison signals are generated; under a first working condition, an on-off state of a main power switch tube of the voltage-type regulator is controlled by constant time signals; and under a second working condition, theon-off state of the main power switch tube is controlled by the comparison signals.

The invention provides a constant voltage circuit of a light-emitting diode (LED) navigation aid lamp and the navigation aid lamp provided with the same. The constant voltage circuit comprises a rectifying circuit, a tank circuit, a voltage detection and control circuit, an isolating circuit and a discharging circuit. The rectifying circuit is used for converting alternating current provided by an external constant current source into direct current output, the tank circuit is used for storing energy of the direct current output, the voltage detection and control circuit is used for monitoring the voltage values of the constant voltage output and controlling the discharging circuit to work, the isolating circuit is used for preventing the energy stored in the tank circuit from backflow, and the discharging circuit is connected at the output end of the rectifying circuit and used for being controlled by the voltage detection and control circuit to work. The constant voltage circuit achieves efficient conversion of current and voltage through charging of the tank circuit by rectified direct current, meanwhile, the voltage detection and control circuit detects output voltage of the tank circuit and controls the discharging circuit to charge and discharge so as to stabilize the output voltage in a predetermined range and ensure constancy of the output voltage.

The invention relates to a tricyclic parallel control electrical source transmitter and a control method. A three-phase alternator passes is connected with a ground load through a three-phase rectifying filter circuit, a full-bridge inversion circuit, a high-frequency isolation transformer, a full-bridge rectifying circuit, a filter inductor, a filter capacitor and a pulse current generator, a main controller is respectively connected with the full-bridge inversion circuit, a current loop detecting circuit, a voltage loop detecting circuit, a pulse current loop detecting circuit and the pulse current generator, and the electrical source transmitter is formed. The disadvantage that a single current loop can not be adaptive to characteristic changes of the ground load in a broadband range is remedied, real-time control over the output current is achieved, and control accuracy at the high-frequency moment is improved. The size of the transmitter is reduced substantially, the weight of the transmitter is reduced, and the number of components is reduced, so that the transmitter is more portable. Isolation voltage is larger than two times of the maximum working voltage of the transmitter, safety of equipment and operators is ensured, interference among signals is prevented, and the instrument can work more stably and reliably.

In an IC card in which an internal circuit is operated by an internal power supply formed from alternate current from outside received by an antenna, the voltage of the internal power supply sometimes changes due to the operation of the internal circuit. Therefore, the voltage controlling circuit of the present invention includes a voltage controlling current source, and when the internal circuit is not operated and the current higher than a predetermined current is detected in the voltage controlling current source, an operating current detector circuit outputs an enable signal. When the internal circuit is operated in response to the enable signal, the current consumed in the internal circuit is subtracted from the current passing through the voltage controlling current source. Consequently, the current change in the entire internal power supply can be prevented, and the output voltage of the internal power supply can be kept constant.

The invention discloses a three-winding axial magnetic field multiphase flywheel pulse generator system, belongs to the field of motors, and solves the problems of low reliability of a system and lowpower density, the low energy density and the large size and weight of a generator system realized by using the flywheel pulse generator set due to long shafting and low rotating speed of the existingflywheel pulse generator set, excitation winding on a rotor of the pulse generator and excitation of a multi-stage rotating rectifier. The generator system comprises an axial magnetic field multi-phase permanent magnet synchronous motor, a direct current output power converter, an electric winding power converter and a multi-phase rectifier. An outgoing line of a magnetic field control winding ofthe synchronous motor is connected with the output end of the direct-current output power converter; an outgoing line of an electric winding of the synchronous motor is connected with the output endof the armature winding power converter; and an outgoing line of a power generation winding of the synchronous motor is connected with an alternating-current input end of the multi-phase rectifier. The system has a good application prospect in the fields of nuclear fusion test technology, plasma and electromagnetic emission technology and the like.

The invention discloses a vagus nerve stimulation device for reducing weight, comprising a controller, a stimulation signal generator and two electrode fixing devices. Each electrode fixing device isprovided with a positive electrode and a negative electrode, and each electrode fixing device is connected with the stimulation signal generator. The electrode fixing device is provided with an earplug and a hook, wherein the earplug corresponds to a concha cavity of a contact person, the hook corresponds to a concha boat of the contact person, and the positive electrode and the negative electrodeare distributed on the earplug and the hook. The vagus nerve stimulating device for reducing weight can treat obesity and other diseases through the auricular branch of the vagus nerve, and does notrequire a patient to take drugs, does not require an implantation operation, does not require a transcranial stimulation, has low cost, and does not bring adverse reactions and side effects to the patient.

The invention discloses an array substrate and a display device. At least two columns of data lines correspondingly and electrically connected with sub-pixels with the same polarity are electrically connected with the same bonding pad located in a non-display area; in this way, the bridging positions of different columns of sub-pixels are arranged in the non-display area, on one hand, the apertureopening ratio of the pixels can be increased, the display brightness can be improved, and on the other hand, the problem that in the display area in the prior art, due to bridging of data lines and the pixels, pixels are coupled, and consequently a display image is poor can be avoided; besides, when the array substrate provided by the invention displays a pure-color picture, the same data line can output constant output voltage, so that the power consumption when the pure-color picture is displayed is effectively reduced.

The invention discloses a stator magnetic circuit-controlled flywheel pulse generator system, and belongs to the technical field of motors and power electronics. The invention aims to solve the problems of low power density, low energy density and large volume weight of the conventional pulse generator set. An output end of an input inverter is connected with an outgoing line of an input motor. Anoutgoing line of the magnetic circuit control alternating-current winding is connected with the output end of the magnetic circuit control direct-current power supply. An armature winding output endof the alternating-current generator is connected with the alternating-current input end of the output rectifier and is connected with the exciting current adjusting unit in parallel. A rotor of the input motor, a rotor of the alternating-current generator and the inertia flywheel are coaxially connected. The system of the invention has the advantages of simple control, high efficiency, low voltage regulation rate, strong overload capacity, high reliability and the like. The system can be used as a high-capacity pulse power supply, and has favorable application prospects in the fields of nuclear fusion test technology, plasma and electromagnetic emission technology and the like.

The invention discloses a power conversion module. The power conversion module has two loops, wherein one loop is an output voltage-stabilizing ring used for controlling an output voltage to be stable while the other loop is an input grading ring used for controlling the value of an input voltage of the module; according to the power supply system with serial connection input and parallel connection output for N modules, voltage sharing of the input voltage of each module can be realized by virtue of the loops, so that the requirements of inputting equalized voltage and outputting equalized current of the power supply system with serial connection input and parallel connection output can be satisfied; in addition, it is ensured that the power supply system has high output voltage precision; direct series-parallel connection of multiple modules is realized, and the power supply system is more flexible; and compared with a two-stage scheme, higher efficiency, more stable output and no influence from topology can be achieved.

The invention provides a battery powered overvoltage and undervoltage locking and 28V-voltage stabilization protection circuit, belongs to the field of battery power sources and is applicable to detection fields of industrial site like power supplying of a pre-amplifier. The battery powered overvoltage and undervoltage locking and 28V stable voltage protection circuit comprises a 28V power source, an overvoltage locking unit, a undervoltage locking unit and a voltage stabilization protecting unit, wherein an overvoltage locking is used for a voltage clamp level when battery powered voltage is too high; the battery undervoltage locking unit is used for a voltage clamp level when the battery powered voltage is too low; the voltage stabilization protection circuit is used for stabilizing voltage after the voltage is locked, eliminating voltage change caused by load change and provided with a circuit protection function. The battery powered overvoltage and undervoltage locking and 28V-voltage stabilization protection circuit has the advantages that voltage locking of battery-powered overvoltage and undervoltage can be achieved, and the voltage can be stabilized via the 28V-voltage stabilization protection module.

The invention belongs to the technical field of generation, conversion or distribution of power, and relates to a method for controlling constant-voltage discharging of an energy storage system of a flywheel. The method comprises the following steps of: arranging a voltage regulation unit, comparing a direct-current output voltage of a direct-current/direct-current (DC/DC) circuit with a set voltage, when a difference between the output voltage and the set voltage is large, regulating according to maximum and minimum outputs, and when the difference is small, performing proportional integration regulation output; arranging a current regulation unit, comparing a sampled current average value with a current set value, when a difference between the sampled current average value with the current set value is large, regulating according to maximum and minimum outputs, when the difference between the sampled current average value with the current set value is small, performing the proportional integration regulation, and limiting the amplitude of the outputs simultaneously; and regulating a duty ratio D of a driving signal by using a comparator and a counter of a digital control chip according to the output of the current regulation unit so as to drive the high-power DC/DC circuit. By the method, the output direct-current voltage can be kept constant under the condition of a certaindischarging depth during quick discharging.

The invention relates to a semiconductor device. To maintain constant an output voltage of a boosted voltage circuit even when a program current of a nonvolatile memory increases; in a boosted voltage circuit provided in a semiconductor device, an output voltage of a charge pump is detected by a voltage dividing circuit, and on-off control is performed on an oscillation circuit for driving the charge pump so that the detected output voltage becomes constant. Further, an output current of the charge pump is detected, and a control current according to a magnitude of the detected output current is generated. The control current is fed into or drawn from a coupling node between a plurality of series-coupled resistance elements configuring the voltage dividing circuit.

This invention relates to wind power generation system based on direct current, which adopts wind machine to directly drive direct current motor to generate energy through IGBT converter into legal alternating electricity into electronic network. According to network, it can join buffer memory battery between direct motor output and IGBT inverter and through memory battery discharging to compensate wind speed within small range to ensure motor output power basic stability.