249 results about "Simple circuit" patented technology

The invention discloses a power battery active equalization control system based on SOC prediction, belongs to the technical field of battery management, and aims to solve the defect that the capacity fading of a battery pack cannot be fundamentally solved by a traditional voltage equalization strategy. According to the system, a dual-active half-bridge equalizer topology is adopted, a second-order RC equivalent circuit model and an FFRLS-EKF joint algorithm are combined to achieve high-precision SOC estimation, and the error is reduced by more than 20% compared with a traditional open-circuit voltage method; a phase shift and duty ratio combined control strategy is innovatively provided, the on-off state of an MOSFET and PWM signal parameters are adjusted in real time, the equalization current is cooperatively regulated and controlled, and the problem of pseudo equalization is solved. According to the method, the SOC of the battery pack can be quickly converged under the working conditions of standing, charging and discharging, the maximum deviation is reduced to 1.49% from 63.2%, the equalization efficiency is improved by more than 10%, and the method has the characteristics of simple circuit, efficient algorithm and strong expansibility, and is suitable for scenes such as a power battery system and an energy storage power station.

The invention provides a voltage difference monitoring device and method for a bootstrap switching power supply and the switching power supply. The device comprises a voltage difference detection module which is configured to detect the voltage difference between the two ends of a bootstrap capacitor and generate a lower tube conduction indication signal if the voltage difference does not reach a set threshold value; the lower tube forced conduction module is configured to generate a plurality of continuous pulse signals according to the lower tube conduction indication signal so as to conduct a lower transistor when the pulse signals are in high level, so that the bootstrap capacitor is charged through the first power supply voltage until the voltage difference reaches a set threshold value; and the negative current detection module is configured to send a forced turn-off signal to the lower transistor forced turn-on module and end the turn-on period, corresponding to the current pulse signal, of the lower transistor if a negative current greater than a threshold value is detected during the period of turning on the lower transistor through the pulse signal. According to the invention, high differential pressure detection precision is realized through a simple circuit structure.

The utility model provides a radio frequency power amplifier and a radio frequency chip. The radio frequency power amplifier comprises an amplifier, a first adjustable attenuation circuit, a second adjustable attenuation circuit and a first capacitor. Compared with the prior art, the first adjustable attenuation circuit and the second adjustable attenuation circuit are additionally arranged at the input end of the amplifier, input attenuation protection is achieved by adopting a simple circuit structure, the number of used devices is small, and the chip area cost can be effectively saved. Meanwhile, the input attenuation amount of the first adjustable attenuation circuit and the second adjustable attenuation circuit can be flexibly adjusted through a digital control bit and an analog control voltage, and free adjustment of different attenuation amounts at different temperatures is achieved; meanwhile, the input end of the amplifier is simple in structure, complex feedback loop control is avoided, the response speed is higher, and deterioration of the radio frequency performance of an amplifier channel is smaller.

The utility model belongs to the technical field of electronic circuits, and discloses a simple circuit capable of generating negative precision voltage reference and resisting high temperature of 200 DEG C. The simple circuit comprises a positive reference voltage source U1, a capacitor C1 and an operational amplifier U2, the output end of the positive reference voltage source U1 is connected to the inverted input end of the operational amplifier U2 through the isolation resistor R, the input end of the positive reference voltage source U1 is connected to a VCC power supply, and the GND pin of the positive reference voltage source U1 is connected to the output end of the operational amplifier U2; a pin 3 of the positive reference voltage source U1 is connected to a VCC power supply; a pin 3 of the positive input end of the operational amplifier U2 is grounded, and a pin 2 of the operational amplifier U2 is connected with a negative power supply; the two ends of the capacitor C1 are connected with the floating ground end of the positive reference voltage source U1 and the output end of the positive reference voltage source U1. According to the utility model, fewer components are used, and the precision is higher; the circuit has flexibility, and different negative precision voltage references can be generated by selecting different reference voltage sources and amplifier combinations; and the negative voltage reference generated by the module at the high temperature of 200 DEG C still has very good temperature stability.

The utility model provides a power-down holding circuit for a switching power supply, which relates to the technical field of switching circuits and comprises a thermistor RT2, a diode D1 and a plurality of electrolytic capacitor banks connected in parallel, and the thermistor RT2 is connected in series with the electrolytic capacitor banks after being connected in parallel with the diode D1. According to the utility model, the circuit structure is simple, and components are few; the impact current is effectively reduced by adopting the power-down holding circuit; and after the input power supply is cut off, the diode D1 is used for discharging the loop, so that the output delay power failure is realized. Meanwhile, by changing parameter matching and device type selection of the power-down holding circuit, different power-down holding time is achieved, the performance is reliable, and therefore the design cost is greatly reduced.

This invention provides an adaptive AGC control circuit and method for broadband RF front-ends. The circuit includes: a gain tuning circuit connected to the RF link of the broadband RF front-end; and a signal detection circuit connected to the gain tuning circuit. The signal detection circuit is used to sample the RF signal in the RF link of the broadband RF front-end through an ADC, and to perform signal processing and gain control on the sampled RF signal based on an FPGA, thereby controlling the gain tuning circuit. This invention uses an FPGA+ADC hardware solution to achieve real-time detection and closed-loop fast control to realize adaptive AGC control of the broadband RF front-end, which has the following characteristics: 1. Simple circuit structure, clear logic, and easy implementation; 2. Real-time signal acquisition and processing with low state control delay; 3. High accuracy of dual-threshold signal detection and discrimination; 4. Flexible and controllable gain, and wide applicability.

The utility model relates to a switching power supply circuit and electronic equipment. The circuit comprises a power supply input end, a power supply output end, a transformer comprising a primary winding and a secondary winding, a main power switch unit, an active clamping unit, a clamping driving unit, a voltage dividing unit and a built-in MOS control chip. The main power switch unit is connected with the power supply input end, the primary winding and the voltage division unit, and is switched on when receiving voltage division output of the voltage division unit; the voltage dividing unit is connected with the power supply input end and the built-in MOS control chip, and generates divided voltage output when the built-in MOS control chip is switched on; the clamping driving unit is connected with the built-in MOS control chip and generates a first driving level when the clamping driving unit is switched on and generates a second driving level when the clamping driving unit is switched off, and the active clamping unit is connected with the primary winding and the clamping driving unit, is switched off when receiving the first driving level and is switched on when receiving the second driving level. According to the utility model, the loop loading capability and the voltage stress bearing capability can be improved through a simple circuit design.

The invention discloses a high over-bias variable load type quenching device for a single photon avalanche diode, and the device comprises a quenching unit which is used for changing the resistance of a variable load tube to infinity to rapidly cut off the avalanche current when the single photon avalanche diode is avalanche, thereby achieving the variable load type quenching; the reset unit is used for generating a delay-adjustable reset signal after quenching is completed, and controlling the single photon avalanche diode to recover to a to-be-detected state; and the high over-bias supporting unit is used for enabling the two ends of the single photon avalanche diode to obtain over-bias higher than the power supply voltage under the low-voltage process. The quenching and resetting time of the quenching circuit is effectively shortened through a simple circuit structure, and meanwhile, the photon detection probability can be greatly improved through the high over-bias voltage which is nearly twice of the power supply voltage.

The invention provides a control circuit and device for electronic anode protection, and relates to the technical field of electronic anode protection. A comparator module is used for controlling on-off of a switching tube, based on the on-off condition of the switching tube, the voltage of the positive and negative ends of an electronic anode module is controlled, when the electronic anode module is connected into a circuit, the switching tube is switched on, the voltage of a first voltage source is applied to the positive input end of a comparator, and the voltage value of the first voltage source is larger than that of a second voltage source. The output end of the comparator module outputs high level to turn off the switching tube, based on the virtual short characteristic of the comparator module, the voltage of the positive electrode end of the electronic anode module follows the voltage of the second voltage source, at the moment, the voltage of the positive electrode end and the negative electrode end of the electronic anode module is insufficient to drive the electronic anode module to work, and the electronic anode stops working. According to the scheme, extra control parts such as a chip are not needed, only a simple circuit structure is adopted, accelerated corrosion of the electronic anode is avoided, the control logic is simple, and the reliability is high.

The application provides a multistage bandwidth regulation photodetector assembly, which comprises a first printed circuit board, a second printed circuit board, and a first printed circuit board electrically connected with the second printed circuit board; the second printed circuit board is printed with a first open loop circuit, and the first open loop circuit comprises at least one resistor which is connected in series; a third printed circuit board is electrically connected with the second printed circuit board; the third printed circuit board is printed with a second open loop circuit, and the second open loop circuit comprises at least one capacitor which is connected in series; a photodetector is arranged on the surface of the first printed circuit board and is electrically connected with the first open loop circuit and the second open loop circuit respectively; and a thin film circuit is arranged on the surface of the first printed circuit board and is electrically connected with the photodetector. The multistage bandwidth regulation photodetector assembly has a simple structure and stable circuit connection, and the resistance and capacitance of the assembly can be actively regulated, so that the bandwidth of the assembly can be autonomously regulated.

The utility model relates to the technical field of power supply circuits, in particular to a bipolar output circuit for a photoresist constant-temperature power supply, which comprises a bipolar inverter circuit, a driving control circuit and an auxiliary power supply circuit. The isolation driving circuit uses a simple optical coupler device, a special digital driver or a high-speed driving optical coupler is not needed, an upper tube driving auxiliary power supply directly couples to generate two paths of driving power supplies through a mode of adding an auxiliary winding on an inductor of a conventional PWM converter, an additional independent auxiliary power supply is not needed, a bipolar voltage output function is realized, and the voltage output is realized. The circuit has the advantages of no physical contact, long service life, simple circuit and low cost.

The invention discloses a circuit for automatically switching test devices and a test box. The circuit for automatically switching the test device comprises a control module and a plurality of test branches, each test branch is used for providing a load device; when the control module carries out on-load test on a board card of the semiconductor parameter analyzer, one test branch is switched on, and other test branches are switched off, so that the switched-on test branch provides an external load device for the board card. According to the invention, the board card can be stably and reliably subjected to the on-load function test by adopting a simple circuit and a control process, tedious connection and frequent device replacement are avoided, the corresponding test efficiency can be improved, and the corresponding test cost is reduced.

This application provides a switching power supply, control method, and charger with a wide input / output voltage range, relating to the field of switching power supply technology. The switching power supply includes a transformer, a power transistor, a PWM IC chip, two auxiliary winding power supply circuits, and a protocol control chip. Each auxiliary winding power supply circuit includes a charge pump and an auxiliary winding. Each auxiliary winding is magnetically coupled to the primary winding of the transformer. One of the auxiliary winding power supply circuits also includes a voltage regulator, with its two ends connected to the two auxiliary windings via two charge pumps. The first end of the voltage regulator is connected to the power supply terminal of the PWM IC chip. The protocol control chip is configured to increase its power consumption when the input AC voltage meets a preset worst-case power supply stability condition. This application embodiment can improve the power supply stability of the PWM IC chip while maintaining the power consumption defined by the protocol standard under non-full load conditions, and has a simpler circuit structure.

The utility model discloses a seven-level inverter topology, which relates to the technical field of multi-level structures and comprises an upper bridge arm and a lower bridge arm, the upper bridge arm and the lower bridge arm are mutually symmetrical except for the direction of a diode, and a plurality of switch tubes, direct current bus capacitors and flying capacitors in the upper bridge arm and the lower bridge arm are connected according to a specific rule. Working modes with seven different output voltages are realized by controlling the conduction state of the switch tube; the topology realizes voltage division through the DC bus capacitor, realizes intermediate level transition through the flying capacitor, combines an optimized circuit structure and a control strategy, has the advantages of simple circuit design, high efficiency, stable output voltage and the like, and is widely applicable to high-voltage and high-power inverter systems.

The invention provides an overvoltage peak absorption circuit. The overvoltage peak absorption circuit comprises an overvoltage detection module, an overvoltage driving module, an energy-saving driving module, an initial driving module and a peak absorption module. When no overvoltage exists at the load end, the energy-saving driving module outputs a low-level signal to the peak absorption module, so that the peak absorption module is kept in a cut-off state; when the load has an overvoltage peak, the overvoltage detection module monitors the voltage of the load in real time and inputs current to the overvoltage driving module, and the overvoltage driving module outputs a high-level signal to drive the peak absorption module to absorb; if a peak appears at the initial stage of power-on, the initial driving module directly obtains load voltage and outputs a high-level signal to trigger peak absorption. The overvoltage peak absorption circuit provided by the invention only acts at an overvoltage moment, has no static loss during normal work, and effectively improves the reliability of the circuit by virtue of a simple circuit structure and rapid response.

The invention discloses a back electromotive force discharge method and system for a direct-current brushless fan of a breathing machine. The method comprises the following steps: receiving a rotating speed adjusting instruction of the direct current brushless fan of the breathing machine, and calling a preset feedforward MAP to obtain an initial discharge duty ratio; according to the obtained initial discharge duty ratio, a discharge circuit is controlled to discharge, and whether rotating speed switching is completed or not is judged; if the judgment is completed, returning the discharge duty ratio to zero, and ending the control; and if the judgment is not completed, acquiring the voltage change rate of the direct current bus in real time by using a bus voltage change rate detection circuit, and dynamically adjusting the discharge duty ratio based on the voltage change rate until the rotation speed switching is completed. The direct-current brushless fan can solve the problems of serious heating, inaccurate discharge and the like of the bleeder resistor, and ensures that the direct-current brushless fan stably and reliably operates under different rotating speed working conditions on the basis of a simple circuit and low cost.

The utility model discloses a light-variable low-voltage LED lamp strip which comprises a circuit board, the circuit board comprises a circuit layer and an upper insulating layer covering the front face of the circuit layer, a plurality of light-emitting modules are arranged on the circuit board, and each light-emitting module is formed by reversely connecting the positive electrode and the negative electrode of a first LED lamp bead and the positive electrode and the negative electrode of a second LED lamp bead which are different in color temperature. The first LED lamp bead and the second LED lamp bead are high-voltage LED lamp beads which are matched with a driving power supply after being connected with resistors in series, the circuit layer comprises a first circuit, a second circuit and a third circuit, the light-emitting modules are connected between the first circuit and the second circuit in parallel, one resistor is arranged every a plurality of light-emitting modules, and the third circuit is connected between the first circuit and the second circuit. And one end of the resistor is connected to the second circuit, and the other end of the resistor is connected to the third circuit. The utility model has the advantages of less resistor consumption, simple circuit, small circuit board width dimension, short minimum shearing unit, easy accurate matching of the shearing length with the actual requirement, and the like.

The application provides a multi-channel sampling method, a multi-channel sampling device and a computer readable storage medium. The method comprises the following steps: obtaining trigger source information corresponding to a plurality of sampling channels of a target ADC module; determining a plurality of channel groups corresponding to the plurality of sampling channels according to a target application scenario; determining a first priority of at least one sampling channel included in each channel group according to a first preset rule; determining a second priority of the plurality of channel groups according to a second preset rule; and in the case that the trigger source information indicates that the plurality of sampling channels include a plurality of target sampling channels, sequentially outputting a plurality of conversion signals corresponding to the plurality of target sampling channels according to the first priority and the second priority. Through the application, the problem of high cost when the ADC implements multi-channel hybrid sampling is solved, and the effect of ADC hybrid sampling can be achieved by only simple circuit configuration.

The invention relates to the technical field of electric appliance control circuits, and discloses a non-isolated zero-crossing detection and commercial power voltage detection multiplexing low-cost simple circuit, which comprises a rectifier diode D3301 of which the cathode is connected with a live wire of a commercial power input end, and the anode is connected with a first resistor R3301; the first resistor R3301, the second resistor R3302 and the third resistor R3303 are connected in series. Through a sampling link formed by a rectifier diode D3301 and series voltage dropping resistors R3301, R3302 and R3303, a zero-cross detection signal is provided for an interruption input end VT at the same time, and a voltage detection signal is provided for an analog input end AD through a divider resistor R3304 and a filter capacitor C3301, so that multiplexing of two types of detection is realized under a non-isolation structure, commercial power detection can be completed without an optocoupler or an isolation transformer, and the detection efficiency is improved. Therefore, devices are reduced and circuits are simplified.

The invention discloses a multiphase power supply and a control circuit thereof, the multiphase power supply comprises a loop control module and a plurality of logic control modules which are connected to form a daisy chain architecture, and the plurality of logic control modules adopt a time division multiplexing mode to sequentially respond to jump edges of output signals of the loop control module to generate switching control signals of the phases, and time sequence information is transmitted between adjacent logic control modules through phase transmission signals, so that accurate staggered conduction of each phase switch is realized. According to the multi-phase power supply, phase dislocation control among a plurality of power level circuits can be realized only by adopting one control loop, the circuit structure is simple, and circuit design simplification and circuit cost reduction are facilitated.

Provided are a shift register unit and a driving method therefor, a gate driving circuit, and a display apparatus, which belong to the technical field of display. In the shift register unit, a register circuit can transmit signals of different potentials to a control node in different time periods under the control of signals such as an input signal and a clock signal, such that a transmission circuit and an output circuit can both output signals of different potentials by means of a connected output end in different time periods under the control of the potential of the control node. Therefore, it can be seen that the shift register unit can be a hybrid circuit of a P-type transistor and an N-type transistor, thereby achieving the overall simple circuit structure and a relatively good output reliability.

The application provides a non-immersed transmembrane pressure detection system, which is characterized in that: a liquid inlet detection module, a permeation end detection module, a backflow end detection module and a transmembrane pressure calculation module are arranged, a non-immersed transmembrane pressure detection circuit is arranged in each of the liquid inlet detection module, the permeation end detection module and the backflow end detection module, the corresponding transmembrane pressure calculation result is obtained by calculating the liquid inlet detection signal, the permeation end detection signal and the backflow end detection signal output by the circuit, a four-stage amplification and analog signal isolation circuit composed of a high-precision resistance voltage division network, a first-stage operational amplifier circuit, a second-stage operational amplifier circuit, a linear optical coupler, a third-stage operational amplifier circuit and a fourth-stage operational amplifier circuit is arranged in the non-immersed transmembrane pressure detection circuit, the detected current signal is converted into an electrical signal by using the operational amplification piezoelectric effect, and the piezoelectric type can provide an anti-interference signal electrical output after isolation chip. The application has good linearity, simple circuit calculation and effectively solves the problem of electrical signal isolation between an analog signal and a single-chip microcomputer application system.

An electronic device configured to minimize heating and quickly charge a battery is provided. The electronic device includes a simple circuit configuration for charging a battery in consideration of compatibility can be provided. When an electronic device has relatively much power consumption of a load circuit of the electronic device while an adaptor is connected to the electronic device, the electronic device may temporarily stop power supply to the battery and thus suppress an increase in internal temperature of the battery.

The application provides a feeding network, an antenna device and a communication device. The main body part is provided with a first conductive part and a second conductive part. In addition, two branch parts are provided, one end of the first branch part is electrically connected with the first conductive part, and one end of the second branch part is electrically connected with the second conductive part. When two radiation parts with the same polarization direction in the radiation unit are respectively electrically connected with the first branch part and the second branch part, the transmission structure of the feeding network can feed two radio frequency signals, for example, two radio frequency signals with equal amplitude and opposite phase, to the two radiation parts of the radiation unit. Compared with the feeding network in the related art, the feeding network in the embodiment of the application has a simple circuit, thereby reducing the signal loss of the feeding network and the size of the feeding network, thereby reducing the occupied space of the feeding network in the antenna device and providing a suitable space for the setting of the array antenna.

The embodiment of the invention provides a current monitoring device and method for a vehicle and an anti-reverse-flow circuit. The current monitoring device comprises an anti-reverse-flow switch and a temperature collecting assembly used for collecting the current temperature of the anti-reverse-flow circuit. A first voltage detection unit and a second voltage detection unit in the voltage detection module are respectively connected with the first detection point and the second detection point; in-phase input ends and anti-phase input ends of a first amplification unit and a second amplification unit in the amplification assembly are respectively connected with two ends of an anti-reverse switch; the control assembly obtains the working current or the sleep current of the anti-reverse circuit according to at least one of the detection value of the first voltage detection unit, the detection value of the second voltage detection unit, the output voltage of the first amplification unit and the first output voltage of the second amplification unit based on the type and the current state of the anti-reverse switch. Therefore, the problems of large error and high sampling resistor cost in the prior art are solved, the dormant current and the working current of the area controller are monitored at the same time through the simple circuit, and the realization is simple.

The invention relates to a battery system, a battery equalization method and device and electronic equipment, and the system comprises battery array elements, each battery array element comprises a battery unit and an access control circuit; the charge state detection module is used for detecting the charge state of each battery unit; and the controller is used for determining target battery units for performing energy equalization according to the charge states, and controlling the access control circuits corresponding to the target battery units to be switched on, so that an energy equalization circuit is formed among the target battery units. By adopting the battery system disclosed by the invention, energy balance between the target battery units can be realized through simple circuit conduction control, the circuit structure topology is simple, the battery array elements for balancing can be flexibly selected, and the realization difficulty is low.

The utility model discloses a multi-mode controlled high-voltage color LED lamp strip circuit, which comprises a null line circuit, a live line circuit and a plurality of control units connected in parallel to the null line circuit and the live line circuit, and each control unit comprises a rectifier module, a first control module and a second control module, the input end of the rectifier module is connected to the zero line circuit and the live line circuit, the output end of the rectifier module is connected to the first control module, the second control module and the various light-emitting modules, and the control output end of the first control module is connected to the signal input end of the second control module. The output end of the second control module controls the multiple light-emitting modules respectively, the signal output ends and the signal input ends of the multiple control units are sequentially connected in series, and the signal input end of the first control unit is used for being connected with an external controller. The control circuit has the advantages of various control modes, few electronic components, simple circuit, low manufacturing cost, convenience in use and the like.

The invention relates to the technical field of ultrasound, and discloses a display signal output circuit in an ultrasonic product and the ultrasonic product, the circuit comprises a hot plug detection module, a differential signal one-to-two module and an HDMI-to-S-Vedio module, the hot plug detection module detects the in-place state of HDMI and S-Vedio display equipment and feeds back the in-place state to a CPU; the differential signal one-to-two module divides a single-path HDMI differential signal output by the CPU into two paths, one path is directly output to the HDMI display device, and the other path is converted into an S-Vedio signal through the HDMI-to-S-Vedio module and then output to the S-Vedio display device. One HDMI signal source is expanded into two different video signals to be output, the problem that CPU video signals are insufficient is solved, and the circuit is simple in structure, flexible in design and suitable for multi-screen display scenes of ultrasonic products.

The application discloses a single-power-supply double-input-end digital isolated brush motor servo driving device, and belongs to the technical field of motor driving. The device comprises a double-end input isolation control interface circuit, a control driving circuit, a power output H-bridge circuit, a current-limiting protection circuit and a system power supply circuit. The double-end input isolation control interface circuit is connected with a signal source. The system power supply circuit is connected with an external power supply. The system power supply circuit is connected with the double-end input isolation control interface circuit and the control driving circuit. The power output H-bridge circuit is electrically connected to the external power supply. The power output H-bridge circuit is connected with a direct-current brush motor. The double-end input isolation control interface circuit comprises an optical coupler O1 and an optical coupler O2, and outputs signals to the control driving circuit. The power output H-bridge circuit is controlled according to the output signals to drive the direct-current brush motor. The application has the effects of being capable of regulating and controlling various states of the motor through a simple circuit, low cost and small space occupation.

The invention relates to the technical field of electronics, in particular to a device and a method for improving resolution through a combined DAC (Digital-to-Analog Converter). According to the invention, through combination and cooperative control of a plurality of low-resolution DACs, significant resolution jump is realized through a simple logic architecture. The method has the core advantages that the universality is high, the precision of the DAC with any initial resolution can be improved, and the method is not limited by a specific model or framework. Compared with a direct design of a high-resolution DAC, according to the scheme, through capacitor charge sharing and precise time sequence control, the output precision is improved through a simpler circuit structure, the integration difficulty is greatly reduced, a mature module of an existing low-resolution DAC can be directly reused, and the adaptability is excellent. Meanwhile, the scheme omits a complex calibration algorithm and control logic, can stably work by virtue of the charge conservation characteristic of hardware, has the characteristics of low cost, easiness in integration and high reliability while ensuring high resolution, and is suitable for various scenes with high requirements on analog output precision.