207results about How to "Wide operating voltage range" patented technology

The invention provides an active bleeding system used for an electric automobile. The active bleeding system comprises a power battery, a bus capacitor, a charging and discharging socket, a bidirectional DC / DC (direct current to direct current) module, a drive control switch, a bidirectional DC / AC (direct current to alternating current) module, a motor control switch, a charging and discharging control module and a controller module, wherein the controller module is connected with the drive control switch, the motor control switch and the charging and discharging control module, and is used for controlling the drive control switch, the motor control switch and the charging and discharging control module according to the current working mode of the active bleeding system. The active bleeding system can be used for carrying out high-power alternating current charging on an electric automobile by using a civil or industrial alternating current power grid, so that a user can charge efficiently and quickly anytime and anywhere, the working voltage range for the battery is wide, and space and cost can be saved. The invention also provides the electric automobile.

The invention relates to a low-voltage power line carrier communication circuit. The circuit comprises a carrier control circuit, a zero-cross detection circuit and a signal coupling circuit. A signal amplifying filter circuit and a receiving filter circuit are arranged between the carrier control circuit and the signal coupling circuit. The signal amplifying filter circuit amplifies and filters analog signals output by the carrier control circuit, and then the analog signals enters into a power line information channel to be transmitted through the signal coupling circuit. The signals transmitted in the power line information channel is converted by the signal coupling circuit, then high-frequency interference is eliminated by the receiving filter circuit, and last the signals are transmitted to the carrier control circuit. The signal amplifying filter circuit is connected with a current-limiting circuit which is used for controlling the output current of the carrier control circuit. The zero-cross detection circuit is connected between the carrier control circuit and a power line, and is used for detecting power network power frequency signal zero passage. The low-voltage power line carrier communication circuit is simple in circuit, and is low in power dissipation, high in fidelity and high in carrier communication property due to the fact that the signal amplifying filter circuit and the current-limiting circuit are added.

The invention discloses a novel two-stage bidirectional energy storage converter control system and a control method thereof. An energy storage converter main circuit mainly comprises a three-phase voltage type PWM (Pulse Width Modulation) rectifier, a novel half bridge three-level push-pull bidirectional DC-DC converter, a charging-discharging buffer interface circuit for limiting battery charging current, and a battery pack module. A control system circuit mainly comprises a voltage and current sensor, a driving circuit, a protection circuit, a main controller, an SOC (State of Charge) detection module, a radiator, a buzzer, a man-machine interface, a communication interface circuit and a system auxiliary power supply. The alternating-current micro-grid power or voltage and the states of charge of energy storage batteries can be detected in real time, so that the running modes of each generating set and the energy storage converter in a micro-grid system are controlled flexibly, and the effects of 'filling peaks and clipping valleys' in a power system, smoothening power in a wind-solar hybrid micro-grid system and the like are achieved. Moreover, the control system has the advantages of high power density, small size, high efficiency, low harmonic content, high reliability, high self-control degree and the like.

The invention relates to a dynamic voltage regulation system applied for low energy consumption, which is characterized by comprising an on-chip monitoring module (1), a self-adaption power supply voltage regulation module (2), a dc-dc convertor (3), a dynamic voltage regulation initial module (4) and a main circuit (5), wherein the on-chip monitoring module (1) monitors errors; the self-adaption power supply voltage regulation module (2) self-adaptively adjusts voltage according to a real-time system parameter; and the dynamic voltage regulation initial module (4) determines the initial voltage of the system and the level of a buffer. The method and the system lower the working voltage of a chip, reduce voltage margin, expand the range of the working voltage and reduce the power consumption of the chip.

The invention discloses a power supply device of a current transformer (CT). The power supply device comprises the CT, a first bridge type rectifier circuit, a surplus current relief switch, a diode, an LC (inductor-capacitor) filter circuit, an input voltage sampling circuit, a reference voltage forming circuit, a return difference comparing circuit, a drive circuit and an isolation high-frequency switch pulse width modulation DC / DC conversion multi-output voltage-stabilized power circuit. According to the power supply device, surplus current output by the CT is relieved by adopting an electronic switch, required energy is extracted from the CT intermittently, so that output overvoltage of the CT is limited, and the CT is prevented from saturating. Electricity taking voltage is increased by adopting a high-voltage input high-frequency switch power supply technology, thus the output current of the CT is reduced, heating of the CT and the rectifier circuit and the relief switch behind the CT is decreased, and the electricity taking efficiency is increased.

Provided is a reference voltage generation circuit. The reference voltage generation circuit comprises a current mirror unit, a first resistance, a second resistance and a temperature coefficient compensation unit. The temperature coefficient compensation unit comprises a first N-channel metal oxide semiconductor (NMOS) tube, a second NMOS tube and a third NMOS tube. A grid electrode and a drain electrode of the first NMOS tube are connected with each other, and are connected with a second end of the first resistance, and a source electrode of the first NMOS tube is connected with the ground. A grid electrode and a drain electrode of the second NMOS tube are connected with each other, and are connected with a first node of the current mirror unit, and a source electrode of the second NMOS tube is connected with the ground. A grid electrode and a drain electrode of the third NMOS tube are connected with each other, and are connected with a second end of the second resistance, and a source electrode of the third NMOS tube is connected with the ground. The first NMOS tube, the second NMOS tube and the third NMOS tube work in a subthreshold region or a saturation region. A first end of the first resistance is connected with a second node of the current mirror unit. A first end of the second resistance is connected with a third node of the current mirror unit. A work voltage range of the reference voltage generation circuit is wide, and energy consumption of the reference voltage generation circuit is low.

The invention provides a charging system for an electric automobile. The charging system comprises a power battery, a first charging interface, a second charging interface, a first charging control branch circuit, a second charging control branch circuit and a controller, wherein the first and second charging interfaces are connected with an external power supply; the first charging control branch circuit is connected between the power battery and the first charging interface, and the second charging control branch circuit is connected between the power battery and the second charging interface; and the controller is connected with the first and second charging interfaces. The charging system can be used for conducting high-power alternating current charging on an electric automobile by using a civil or industrial alternating current power grid, so that a user can charge efficiently and quickly anytime and anywhere, the working voltage range for the battery is wide, and space and cost can be saved. The invention also provides the electric automobile.

A simple SCM (Self Cascode MOSFET) structure to generate a sub-1V reference voltage in the SCM intermediate node. The structure requires only 2 transistors to create a temperature-compensated reference voltage. When sized correctly, the transistors in the SCM will operate both at weak, moderate or strong inversion, and in the saturation region or saturation and triode regions, providing good correspondence and low part to part variation. The following proposal innovates by operating with supply voltages on a broad variation range, from 3.6V through below 1V (sub-1V operation), with bias currents in the range of tens of nA (nano Amperes) and temperature variation smaller than ±1% from −40° C. through 85° C. This is an extremely low cost implementation (in terms of area and complexity), compatible with standard CMOS manufacturing processes, and very robust (in terms of fab-to-fab transference, technology mapping, and also well controlled part-to-part variation).

A high-efficiency intelligent high-side electronic load switch with wide voltage adaptability comprises a power supply module, a core control module, a self-boosting module, a voltage detection module, a current detection module and a switching module. The core control module is used for signal acquisition, information processing and storage and logic control; firstly, the core control module receives an external switch control input signal and detection signals output by the current detection module and the voltage detection module and processes and analyzes monitoring data according to an internally stored program to control the switching module to complete corresponding actions; secondly, the core control module provides a PWM control signal for the self-boosting module. The voltage detection module and the current detection module are used for detecting the real-time operating voltage and current of the switching module and transmitting data to the core control module for processing and analysis. The self-boosting module is used for providing a driving voltage for a switching tube in the switching module. The switching module is used for executing the on-off actions of a load. The high-efficiency intelligent high-side electronic load switch is wide in operating voltage range, high in operating frequency, high in efficiency, low in loss, safe, reliable and programmable.

The invention discloses a servo circuit of quartz accelerometer, comprising an integrated part and a divided part wherein the integrated part comprises a triangle generator, a differential capacitance detector, an integrating amplifier and a transconductance amplifier; and the divided part comprises a negative feedback circuit, an outer timing capacitor, an outer timing resistance and outer offset resistance. The triangle generator outputs the triangular wave to the differential capacitance detector by an emitter follower. The differential capacitance detector charges and discharges the differential capacitor of the swinging subassembly of the accelerometer the detected differential capacitance signal is converted into the corresponding error current signal and the error current signal is output to the integrating amplifier. After the slowly varying pressure signal is obtained after integrate demodulation by the integrating amplifier, the transconductance amplifier is pushed. The slowly varying pressure signal is added on the electromagnetic torquer of the quartz accelerometer through the transconductance output terminal to form the restoring torque, so as to recover the swing slice at the balance position. The negative feedback circuit is mounted between the inverted input terminal of the integrating amplifier and the output feedback terminal of the transconductance amplifier to form a complete closed loop test system with deep negative feedback.

Disclosed are current sink and source circuits, a charge pump that incorporates them, and a phase locked loop that incorporates the charge pump. The current sink and source circuits each have a current mirror that biases a transistor connected to an output node. These circuits each further have a two-stage feedback amplifier to sense the current mirror drain voltage and to control the transistor gate voltage in order to stabilize the current mirror drain voltage independent of output voltage at the output node. The amplifier also increases output resistance at the output node. This configuration allows for a wide operation voltage range and ensures good circuit performance under a very low power supply. A charge pump that incorporates these circuits generates highly matched charging and discharging currents. A PLL that incorporates this charge pump exhibits minimal bandwidth shifts and minimal locking speed and jitter performance degradation.

The invention provides a power system capable of being switched between a charge-discharge function and a drive function. The power system comprises a power battery, a charge-discharge socket, a two-way DC / DC (direct current / direct current) module, a drive control switch, a two-way DC / AC (direct current / alternating current) module, a motor control switch, a charge-discharge control module and a controller module, wherein the controller module is connected with the drive control switch, the motor control switch and the charge-discharge control module, and is used for establishing an access between the power battery and the motor when the current working mode of the power system is a drive mode, and for establishing an access between the charge-discharge socket and the power battery when the current working mode of the power system is a charge-discharge mode. The power system can achieve high-power alternating current charging for an electric automobile by a civil or industrial AC network, so that a user can charge efficiently and rapidly anytime anywhere; and the range of operating voltage of a suitable battery is wide, and the space and the cost are saved. The invention further provides an electric automobile.

The invention discloses light-weight and small-sized mangneto swinging bionic robot fish, which comprises a fish body, a magnetic motive force fish tail, a U-shaped block and a charging pile, wherein the fish body and the magnetic motive force fish tail are connected through the U-shaped block, the charging pile is arranged at the lower end of the surface, connected with the fish tail, of the fish body, the fish body comprises an infrared sensing probe, a second waterproof casing I, a second waterproof casing II, a control switch and a waterproof soft plug, the second waterproof casing II is arranged at the outer surface of the fish body, and the magnetic motive force fish tail comprises an magnetic induction coil, a rotating shaft, a PVC (polyvinyl chloride) tube pipe, a round permanent magnet and a flexible fish tail. The light-weight and small-sized mangneto swinging bionic robot fish has the advantages that the structure is simple, the weight is light, and the size is small; a magnetic motive force pushing mechanism does not need any waterproof protection, and the complexity of the mechanism is greatly reduced, the energy consumption is low, and the cruising capability is improved; the energy consumption power of a magnetic motive force mode is 1 / 4 of that of a motor, and in addition, the work voltage range is wider; the control is simple and convenient, and the advancing, the acceleration, the turning, the sinking and floating and the like of the robot fish can be easily controlled through controlling the current direction and the current intensity of the coil.

A wireless power receiving terminal and a wireless charging system are disclosed. A switch is arranged between any one of the input ports and any one of the output ports of a full-bridge rectifying circuit for switching the operation mode of the rectifying circuit. The full-bridge rectifying circuit operates normally when the switch is turned off. A portion of rectifying components in the full-bridge rectifying circuit operate in a half-bridge multiplying mode and the other portion of the rectifying components are short-circuited and do not operate when the switch is turned on. Thus, the rectifying mode of the rectifying circuit and then an output voltage of the rectifying circuit are adjustable, and the operation voltage range of the wireless electric energy receiving terminal is expanded and the wireless power receiving terminal can operate normally when the magnetic field intensity is relatively high or relatively low. And at the meanwhile, it is also possible to provide a post-stage circuit (such as DC-DC converter) with relatively small operation voltage range to reduce the cost.

The invention provides a charging control system for an electric automobile. The charging control system comprises a power battery, a charging and discharging socket, a bidirectional DC / AC (direct current / alternating current) module, a charging and discharging control module and a controller module, wherein the charging and discharging socket is connected with an external power supply; the first direct current end of the bidirectional DC / AC module is connected with the other end of a drive control switch, and the second direct current end of the bidirectional DC / AC module is connected with the other end of the power battery; one end of the charging and discharging control module is connected with the alternating current end of the bidirectional DC / AC module, and the other end of the charging and discharging control module is connected with the charging and discharging socket; the charging and discharging control module comprises a three-phase charging branch circuit and a signal phase charging branch circuit, so that three-phase charging and discharging or single phase charging and discharging can be respectively realized; the controller module is connected with the charging and discharging control module, and is used for determining the rating of the external power supply, when the rating of the external power supply is three-phase, the controller module is used for controlling the startup of the three-phase charging branch circuit, and when the rating of the external power supply is single-phase, the controller module is used for controlling the startup of the single-phase charging branch circuit. The invention also provides the electric automobile.

The invention discloses a method and a device for directly starting an automobile by voice and preventing thievery on the basis of an embedded system. The method includes that a voice prompting command is transmitted from a central control unit to a voice prompting unit, and prompting voice is played via a loudspeaker after the voice prompting unit receives the command; a user says a voice command recorded in advance after hearing the prompting voice, a voice acquisition unit converts the voice command into analog electric signals and transmits the analog electric signal to a voice codec, and the voice codec samples and encodes the analog electric signals, then converts the analog electric signals into digital signals and transmits the digital signals to the central control unit; the central control unit computes the inputted voice digital signals, compares the voice digital signals with a voice model in a storage unit and identifies the voice digital signals; and an automobile starting command is transmitted to an automobile starting control unit after the voice digital signals are identified, and the automobile is started after the automobile starting unit receives the automobile starting command. A thievery prevention function of the automobile is realized according to uniqueness of acoustic features of the voice, identity of the speaker is analyzed and identified by mode recognition technology, and whether to directly start the automobile or not is judged.

The invention discloses a charge pump circuit, which at least comprises a charging / discharging circuit, a current duplicating circuit and an operational amplifier circuit, wherein the charging / discharging circuit comprises a charging module and a discharging module; an intermediate node of the charging module and the discharging module is connected to one input end of an operational amplifier; the current duplicating circuit is used for duplicating a charging current as well as generating a reference voltage; an output end of the current duplicating circuit is connected to the other input end of the operational amplifier; the output end of the operational amplifier circuit is connected to a discharging circuit and an NMOS (N-channel Metal Oxide Semiconductor)in a duplicating circuit; the operational amplifier circuit is used for controlling a discharging current of the discharging module to be equal to an NMOS current of the duplicating circuit; and the NMOS current of the duplicating circuit is equal to a PMOS current forever. The charge pump circuit provided by the invention is used for achieving the purposes of reducing a mismatching degree of the charging current and the discharging current and ensuring a working voltage scope outputted by a charge pump to be wider.

The invention discloses a one-phase five-level inverter. The one-phase five-level inverter comprises a common ground type three-level switching circuit, a filter circuit and a power frequency inversion circuit. For being realized specifically, the inverter comprises six power switches from S1 to S6, two diodes from D1 to D2, and a one-phase output filter F. The output of the inverter is five levels, and the inverter has the advantages of being high in inversion efficiency and reliability and simple in control mode. Meanwhile, through the voltage clamp mode, the inverter can eliminate high-frequency common mode current danger in a non-isolated type grid-connected inverter system effectively. Thus, the inverter is especially suitable for being applied to a non-isolated type photovoltaic grid-connected system.

The invention discloses a carbon electrode modified by cerium-zirconium oxide. The carbon electrode comprises a carbon braided electrode serving as a substrate and the cerium-zirconium oxide attached to the surface of the carbon braided electrode and used for modifying the carbon braided electrode. A flow battery comprises the carbon electrode modified by the cerium-zirconium oxide. A preparation method of the carbon electrode modified by the cerium-zirconium oxide comprises the following steps of attaching the cerium-zirconium oxide to the surface of the carbon braided electrode serving as the substrate, and modifying the carbon braided electrode. The carbon electrode provided by the invention has high conductivity, high wettability, high electrochemical activity and high stability, is applied to the flow battery, and can remarkably improve the performance of the flow battery, particularly high-power discharge performance and cycle life.

The invention provides an air-conditioner with a fixed frequency, comprising a compressor, a throttling device, an evaporator, a gas-liquid separator and a condenser, wherein, the compressor is provided with an air inlet and an air exhaust hole; the throttling device is provided with an inlet and an outlet, the evaporator is provided with an inlet and an outlet, and the inlet of the evaporator is connected with the outlet of the throttling device; the gas-liquid separator is provided with an air sucking hole and an air outlet, the air sucking hole of the gas-liquid separator is connected with the outlet of the evaporator, and the air outlet of the gas-liquid separator is connected with the air inlet of the compressor; and the condenser is provided with at least two inlets and at least two outlets, the inlets of the condenser are connected with the air exhaust hole of the compressor, and the outlets of the condenser are connected with the throttling device. The air-conditioner with a fixed frequency provided by the invention has a wide operation voltage range, can operate at a low voltage, and is especially applicable to the regions with unstable voltages.

The invention discloses a bootstrap type charging circuit applied to a high-voltage DC-DC (Direct Current-Direct Current) convertor. The problems that the conventional internal power supply driving capacity is limited, and bootstrap voltage relies on SW voltage of an output pin of the DC-DC converter can be mainly solved. The bootstrap type charging circuit comprises a voltage difference sampling circuit (1), an error amplifier (2) and a trans-conductance amplifier (3); the voltage difference sampling circuit converts the difference value of the output pin BST and the output pin SW of the DC-DC converter into a voltage difference signal SENSE; the voltage difference signal and reference voltage REF (Reference) inside the DC-DC converter is subjected to differential amplification through an error amplifier, so as to output a difference signal CTL; the difference signals are converted into a current signal through the trans-conductance amplifier, and is connected with a voltage difference sampling circuit through a diode, so as to form a negative feedback control loop; and the trans-conductance amplifier uses high-voltage power supply VIN through the DC-DC converter, so as to ensure that the charging current is directly supplied by a chip power source. With the adoption of the bootstrap type charging circuit provided by the invention, the driving capacity of a main switch tube can be effectively improved; the stability of the bootstrap voltage can be ensured; the bootstrap type charging circuit does not rely on the SW voltage of the output end, and can be used for the large-load DC-DC converter.

The invention provides a pulsating DC (direct current) aftercurrent protector and a running method thereof. The protector comprises a switching device, a microprocessor, a zero sequence current transformer, an aftercurrent signal amplifying circuit and a power supply, wherein the output of the zero sequence current transformer is connected with the aftercurrent signal amplifying circuit; the output of the aftercurrent signal amplifying circuit is connected with the microprocessor; the switching device is connected with the microprocessor; the input of the power supply is connected with a power grid; and the output of the power supply and the microprocessor are connected with the switching device. The protector can distinguish the types of aftercurrent waveforms and adopts the different protective measures in accordance with the different types of the aftercurrent waveforms, thus improving the protection accuracy; and the protector is suitable for the aftercurrent protection of the power grid with different frequencies or can be used for realizing the accurate aftercurrent protection when the frequency of the power grid is changed, thus expanding the application occasions of the protector. The protector is simple in structure, small in volume and very low in power consumption.

The invention belongs to the technical field of supercapacitors, and relates to a dissymmetrical supercapacitor with high energy density and a method for preparing the same. The capacitor consists of a manganese oxide anode, a porous carbon cathode, an electrolyte, a septum, an anode lead wire, a cathode lead wire and a shell. The method combines manganese oxide as high oxygen polarized overvoltage of an anode and porous carbon as hydrogen polarized overvoltage of a cathode to form a dissymmetrical capacitor element so as to essentially improve the working voltage (2V) of a supercapacitor unit. Compared with the working voltage of between 0.6 and 0.8 V of a single-material capacitor unit in a water-phase electrolyte, the dissymmetrical supercapacitor improves the energy density of the capacitor to a large extent, thereby making the rapid large-power charging and discharging possible and broadening the range of the working voltage of the capacitor unit; and a process for preparing an electrode material is simple, adopts a neutral water-phase electrolyte and is easy for industrialized application.

A downlink level shifting circuit includes a high side input network, a common gate voltage-withstanding structure and a low side latch circuit; the high side input network consists of two parallel PMOS devices of a common source structure, and transmits an input signal to the common gate voltage-withstanding structure; the common gate voltage-withstanding circuit includes a pair of common gate PMOS transistors, a pair of common gate NMOS transistors and two clamp diodes; and the low side latch circuit includes two pairs of NMOS transistors used as linear resistors and a latch structure formedby a pair of cross-coupled NMOS devices, and enables a high-side signal to be transmitted to a low-voltage region when a high-side voltage difference is very small.

The invention discloses a wide-input low-dropout linear voltage stabilizing circuit, which comprises a comparison circuit, a dynamic bias circuit, a wide-input buffer stage circuit, a power tube, a detection feedback circuit, a frequency compensation circuit and an off-chip capacitor, wherein the comparison circuit compares the feedback voltage with the reference voltage and adjusts the power tubeaccording to a comparison result to ensure the stability of the output voltage; the dynamic bias circuit dynamically adjusts the current of the wide-input buffer stage circuit according to the magnitude of the load current, so that the LDO circuit drives a large load with a small quiescent current; the wide-input buffer stage circuit drives a grid capacitor of the power tube to play an isolationrole; the detection feedback circuit is used for sampling output voltage and feeding back a sampling result to the input end of the comparison circuit; and the frequency compensation circuit is used for compensating the frequency of the LDO circuit to ensure the stability of the LDO circuit in the whole load range. According to the LDO circuit provided by the invention, an off-chip large capacitorcan be driven, and the low-voltage design of the LDO circuit is realized.

This invention relates to swing arm magnetic switch with switch body and close block, wherein, The switch body has shell, switch axle composed of static and dynamic probes; the shell is located with isolation rack fixed on the supportive axle and static probes; the supportive axle is fixed with reverse main swing arm at an angle around; the main swing arm is fixed with one permanent iron to make the main arm rotate for an angle through the above close block; the dynamic probe is directly fixed on the main swing arm to keep electrical connection to realize dynamic and static probes.

The invention discloses a glass cleaning intelligent robot. The intelligent robot comprises a moving mechanism, a sensing system, a control system, a cleaning system and the like, wherein the moving mechanism comprises a screw slide rail, a linear bearing, a hydroelectric synchronous belt conveyer, a precise motor driving system and the like; the sensing system comprises an automatic stroke induction switch, a monitor induction sensor and the like; the control system comprises a U active control card chip and an intelligent wireless remote control system thereof and can be loaded on an industrial camera for real-time monitoring, operation is realized via APP of mobile phones, and the aim of intelligent glass and curtain wall cleaning can be achieved; and the cleaning system comprises an automatic water spray system, a cleaning brush roll, a rubber scraper, a water storage tank and the like, and other intelligent modules can be expanded. The invention aims at providing an intelligent glass cleaning robot, spontaneous working mode under an unmanned situation can be realized, and the automatic level of a product can be improved to a great extent.

The invention discloses a working electrolyte employed by an aluminium electrolytic capacitor used by an LED lamp. The ingredients of the electrolyte comprise the following parts, by weight: 38.5% to 85.9% of a main solvent, 5% to 25% of an auxiliary solvent, 4% to 20% of a solute, 5% to 15% of a property-modifying additive, 0.2% to 1% of a hydrogen elimination agent and 0.1% to 0.5% of a water-proof mixture; and the main solvent is glycerol. According to the invention, a working electrolyte of an aluminium electrolytic capacitor is improved. At the same time, materials including an anode aluminum foil and a piece of electrolytic paper are optimized; product design is improved; and a volume of an external form of a product is diminished. Moreover, a sealing technology of the product is enhanced and a square waisted wheel is used for assembly, so that volatility of the electrolyte is reduced and product service life is improved. An aluminium electrolytic capacitor, which has high performance and long service life and is used for an LED lamp, is successfully developed.

This invention relates to a device for controlling vibration of motors with audio, in which, the control circuit is composed of connected modules of audio signal amplification process, level testing and rhythm signal generation, sine wave signal generation and power amplification drive circuit to output signals and control the motor. The audio signal enters into audio signal amplifying process circuit to pre-process waveforms, the emitter of a triode is connected to the earth directly, so that, it works at the non-symmetrical state to intensify the differentiation of rhythms, then enters into the level testing and the rhythm signal generating circuit, the chip IC1 is an adjustable output precision serial stabilized unit to pass through end C of the IC1 to be output to a reverse amplification circuit composed of resistor R4, R5 and triode Q2 and the voltage drop reaches to the trigger voltage of chip IC2, the sine wave signal generation circuit generates 175Hz sine waves with designed R and C value and a power amplification driving circuit amplifies the signals to let the voltage Vpp reach to the rated working voltage.

The invention relates to a modified spinel type lithium ion battery cathode material, which is a layered composite material with a core-shell structure formed by a spinel phase material as the core material and a lithium-rich phase material as the shell material. The preparation method comprises the steps of carrying out co-precipitation reaction on nickel-manganese mixed salt solution and mixed solution of aqueous ammonia and sodium carbonate to obtain a nickel magnesium carbonate precursor; uniformly mixing the precursor with Li2CO3 according to the stoichiometric ratio, and roasting to obtain a powder granular core material with a spinel structure; uniformly mixing the core material with Li2CO3 according to the stoichiometric ratio, and roasting to obtain the target product. The modified spinel type lithium battery cathode material and the preparation method thereof have the advantages the modified spinel type cathode material is high in specific capacity, high in cycling stability, and high in the first discharge efficiency; the preparation process of the material is excellent in controllability, low in manufacture cost, and good for large-scale production so as to meet the demands for high voltage / high specific capacity materials in the market.