274 results about "Positive power" patented technology

The ultralow frequency sensor comprises a vibration detection unit, a power supply voltage stabilization unit and a signal conditioning unit, the power supply voltage stabilization unit is provided with a low dropout linear voltage regulator U20, a voltage converter U19 and a negative voltage regulator U21, and the low dropout linear voltage regulator U20 stabilizes an external power supply as a positive power supply VCC; the voltage converter U19 is used for converting positive voltage of an external power supply into negative voltage and outputting stable negative power supply VEE through the negative voltage stabilizer; the positive power supply VCC and the negative power supply VEE supply power to the signal conditioning unit; the signal conditioning unit comprises a high common mode rejection differential amplifier, a differential-to-single-ended amplifier, a band-pass filter and a differential output driver, a differential signal output by the vibration detection unit sequentially passes through the high common mode rejection differential amplifier, the differential-to-single-ended amplifier, the band-pass filter and the differential output driver, and then a differential voltage signal is output; the method has the advantages of high stability and reliability and the like.

The invention discloses a double-voltage adaptive rectification PFC (Power Factor Correction) circuit structure and an electric flame stove. The double-voltage adaptive rectification PFC circuit structure comprises an EMI (Electro-Magnetic Interference) filtering unit, a voltage doubling rectification unit, a full-bridge rectification unit, a circuit switching control unit, a startup protection unit and a power factor correction unit. According to the circuit switching control unit, through conversion of full-bridge rectification or voltage-multiplying rectification, adaptability to commercial power of two different voltages is achieved; according to the power-on protection unit, when 220V mains supply is input, after the circuit voltage is stabilized, the relay RLY2 is completely switched on, and soft start protection is achieved; according to the invention, the MOS tube Q1 / Q2 is alternately connected and disconnected in a time sequence, so that the inductor L2 stores energy or discharges, the capacitor C22 is charged or discharged, the power factor correction unit outputs stable high-voltage electricity to a rear-end circuit or a load, when the MOS tube Q2 is connected, the resistance is zero, the superposed high-voltage electricity is transmitted to the rear-end circuit when the potential of the inductor L2 discharges, and low-loss energy conversion is realized.

The invention discloses a passive multi-stage voltage soft turn-off circuit suitable for SiC MOSFETs. The passive multi-stage voltage soft turn-off circuit comprises a driving main branch, a plurality of voltage reduction branches, a driving resistor, a discharging resistor and a driving power supply circuit. The driving power supply circuit is powered by a positive power supply VCC when the SiC MOSFET is turned on, and is powered by a negative power supply VEE when the SiC MOSFET is turned off. The voltage reduction branches are connected to the two ends of the driving main branch in parallel. The step-down branch comprises a step-down delay unit, a step-down action unit and a step-down unit which are sequentially connected in series; the delay time of each step-down branch is increased in sequence, and the step-down voltage drop is increased in sequence. According to the invention, the voltage level can be conveniently controlled by changing the number of the voltage reduction branches, an additional power supply module does not need to be added, the voltage reduction time can be controlled by the voltage reduction delay branches, the degree of freedom of driving is greatly increased, and the circuit is low in complexity, high in voltage reduction degree of freedom and high in reliability.

The utility model discloses a parallel operation copper bar and system of an electronic load, and the parallel operation copper bar comprises a positive electrode copper bar which is used for connecting the positive electrode power input end of the electronic load; the cathode copper bar is used for connecting a cathode power input end of the electronic load, and the cathode copper bar and the anode copper bar are oppositely arranged at an interval; the insulating plate is arranged between the positive electrode copper bar and the negative electrode copper bar, and the positive electrode copper bar and the negative electrode copper bar are tightly attached to one side face of the insulating plate respectively. According to the invention, the amplitude of current overshoot oscillation can be reduced, and the reliability and safety of the parallel operation system of the electronic load are improved.

The invention provides a compact type low parasitic inductance half-bridge packaging structure, which is characterized in that two ends of a main substrate are provided with a positive electrode connecting terminal and an alternating current connecting terminal, a first chip and a second chip are arranged between the two terminals, a positive electrode power electrode of the first chip is electrically connected with the positive electrode connecting terminal, and a negative electrode power electrode of the second chip is electrically connected with the alternating current connecting terminal; a positive power electrode of the second chip is electrically connected with the alternating current connecting terminal, and a negative power electrode of the second chip is electrically connected with the negative terminal; the control substrate is arranged over the two chips in a crossing mode, a first gap bridge connecting piece is arranged on the surface of one side of the control substrate, a negative power electrode of the first chip is electrically connected with the alternating current connecting terminal through the gap bridge connecting piece, and a plurality of grid connecting pieces capable of being electrified with grids of the two chips are arranged on the surface of the other side of the control substrate. The control substrate is arranged above the main substrate, so that the grid electrode of the device is arranged above the space, larger plane space occupied by the grid electrode is reduced, meanwhile, the distance between the grid electrode connecting piece and the chip grid electrode is shortened, and the overall size of the packaging structure is reduced.

A module system (20) includes a safety module (32) and an external output module (36). The external output module has: a first positive input terminal (170a) electrically connected to a positive electrode (26p) of a power supply (26); a negative input terminal (180) electrically connected to a negative electrode (26n) of the power supply; a positive power supply terminal (176) electrically connected to the first positive input terminal and electrically connectable to an external device (22); and a negative power supply terminal (186) electrically connected to the negative input terminal and electrically connectable to the external device.

The invention relates to the technical field of integrated circuits, and discloses a substrate bias effect resistant CMOS electronic relay control method and system. The method comprises the following steps: constructing an electronic relay circuit by adopting a P-type substrate high-voltage CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process, and connecting a P-type substrate with a negative power supply Vss; the tube body end of the input-stage PMOS is in short circuit with a source electrode and is connected with an intermediate voltage source, and the substrate bias effect is eliminated by using the isolation characteristic; the NMOS tube adopts an asymmetric isolation structure, a body end and a source electrode are short-circuited and connected with a grounding end, and electrical isolation is realized through an N buried layer; the body source short circuit configuration enables the threshold voltage of the input end to be stabilized at the intermediate value between the intermediate voltage source and the grounding end, and does not drift along with the change of the positive power supply Vdd. According to the invention, the problem that the input threshold voltage is unstable due to the substrate bias effect of the PMOS transistor in the existing N-type substrate electronic relay technology is solved, and the control precision and reliability of the electronic relay under different working voltage conditions are improved.

The utility model discloses a string type inverter and a power generation system. The group of serial inverters comprises N paths of MPPT units, N is a positive integer greater than or equal to 3, and each path of MPPT unit comprises a DC / DC module, a positive DC access terminal connected with the DC / DC module through a positive power line and a negative DC access terminal connected with the DC / DC module through a negative power line; the group string type inverter further comprises an RSD transmitter, the RSD transmitter comprises a coupling magnetic core capable of being connected with a fast turn-off signal, the positive power lines of the n paths of MPPT units penetrate through the coupling magnetic core, the negative power lines of the N-n paths of MPPT units penetrate through the coupling magnetic core, and n is a positive integer smaller than N. According to the embodiment of the invention, the emitter with the built-in quick turn-off device can be realized on the direct current side of the inverter at low cost.

A virtual image display apparatus or an optical unit includes a display element, a first prism on which the image light is incident, a second prism joined to the first prism to constitute a prism-based light guide member having a parallel plate shape, an inclined mirror portion disposed at a joining portion between the first prism and the second prism and configured to reflect the image light, a lens having positive power and disposed so as to face an outer side surface of the first prism, and a transmissive mirror formed at an external side of the lens, the image light reflected by the inclined mirror portion, wherein the first prism has, at one of the outer side surface and an inner side surface facing the outer side surface in an upper portion, a ghost prevention structure configured to suppress propagation of the image light.

The utility model discloses a surge current suppression circuit suitable for high-voltage input, which belongs to the technical field of power electronics and comprises an MOS (metal oxide semiconductor) tube, a triode, a first capacitor and a second capacitor. A collector electrode of the triode is connected to a power supply positive electrode line through a resistor, an emitter electrode of the triode is connected to a power supply negative electrode line, a base electrode of the triode is divided into two paths, one path of the base electrode of the triode is connected with a source electrode of the MOS tube through a sixth resistor, and the other path of the base electrode of the triode is connected with a drain electrode of the MOS tube through a fourth resistor; one end of the first capacitor is connected between the second resistor and the first resistor, and the other end of the first capacitor is connected to the power supply cathode line; and the MOS tube is connected to a power supply cathode line. Compared with the prior art, the circuit does not need an auxiliary power supply and an operational amplifier circuit, so that the cost and the arrangement space are saved, the related requirements of GJB181A-2003 on the input current are met, and the power supply and front-end equipment can be protected.

We provide an imaging lens system, camera module, in-vehicle system, and mobile device with sufficient field of view and brightness for sensing inside and outside a vehicle at night or in adverse weather conditions. [Solution] The imaging lens system 11 consists of a front group Gf, an aperture diaphragm STOP, and a rear group Gr, comprising a first lens L1 with negative power whose image side faces concave toward the image, a second lens L2 with object side faces concave toward the object, a third lens L3 with positive power, a fourth lens L4 with power, a fifth lens L5 with power, a sixth lens L6 with power, and a seventh lens L7 with power. Among the lenses with positive power from the first lens L1 to the seventh lens L7, the third lens L3 has the greatest power, and when the focal length of the first lens L1 is defined as f1 and the focal length of the entire optical system is defined as f, the following condition (1) is satisfied. -2.5

Provided are an imaging lens system that can achieve high resolution and a compact size, a camera module, a vehicle-mounted system, and a mobile object. This imaging lens system comprises, in order from the object side to the image side: a first lens (L1) that has negative power and has an image-side surface having a concave surface facing the image side; a second lens (L2) that has negative power, has an object-side surface being an aspherical shape having an infection point with a central portion having a concave surface facing the object side and a peripheral portion having a convex surface facing the object side, and has an image-side surface having a concave surface facing the image side; a third lens (L3) that has positive power, and has an image-side surface having a convex surface facing the image side; an aperture STOP; a fourth lens (L4) that has positive power, and has an object-side surface having a convex surface facing the object side; and a fifth lens (L5) and a sixth lens (L6) that constitute a cemented lens, one having negative power and the other having positive power.

An optical device includes: a first reflective surface having a power; a second reflective surface on a magnification side of the first reflective surface and having a power; a first optical element on a magnification side of the second reflective surface, the first optical element having a first transmissive surface, a third reflective surface having a concave shape in an incident light ray direction, and a second transmissive surface different from the first, which are disposed in order from a reduction side to a magnification side; a third optical element having a fourth reflective surface disposed on the magnification side of the second reflective surface; and a fifth reflective surface disposed between the fourth reflective surface and the first transmissive surface. The third reflective surface has a positive power, and the fourth reflective surface is on a reduction-side conjugate surface side relative to the first and third reflective surfaces.

It detects the occurrence of a ground fault and suppresses the spread of damage caused by the ground fault. [Solution] The motor drive circuit 2 includes an inverter circuit 4 equipped with a switching element that generates a drive voltage to be applied to the motor M, and an inverter protection circuit 1. The inverter protection circuit 1 includes a first resistor R1 connected between the inverter circuit 4 and a positive power supply line 7 that supplies a constant voltage to the inverter circuit 4, a first detection circuit 11 that outputs a first detection signal E1 indicating that a ground fault or inter-phase short circuit has been detected based on the current flowing through the first resistor R1, and a first protection circuit 12 that cuts off the supply of a signal for driving the switching element based on the first detection signal E1.

The present invention relates to a flow-electrode capacitive deionization device comprising: a plurality of flow-electrode cartridge units arranged in a first direction, through each of which an electrode fluid flows, and which allow ions to permeate through at least one of both sides in the first direction; raw water flow units respectively coupled, between each pair of adjacent flow-electrode cartridge units in the first direction, to the flow-electrode cartridge units positioned on both sides thereof in the first direction, through which raw water to be deionized flows, and which allows ions to permeate through both sides in the first direction; housings configured to seal, in the first direction, the flow-electrode cartridge units which are respectively arranged at the outermost ends on both sides in the first direction; and a positive power line and a negative power line alternately connected to the plurality of flow-electrode cartridge units in the first direction so that the plurality of flow-electrode cartridge units alternately form positive-electrode flow-electrode cartridge units and negative-electrode flow-electrode cartridge units in the first direction, wherein, when power is applied through the positive power line and the negative power line, negative ions in the raw water flowing through each of the raw water flow units move into the electrode fluid in the positive-electrode flow-electrode cartridge units, and positive ions in the raw water flowing through each of the raw water flow units move into the electrode fluid in the negative-electrode flow-electrode cartridge units.

The present invention provides an intraocular lens and related technologies, which have regions concentric with a lens center O, including at least one distance region for correcting visual acuity for distance vision and at least one near region for correcting visual acuity for near vision, wherein the power in the distance region is reduced to provide a negative vertical spherical aberration that at least partially offsets the positive vertical spherical aberration caused by the cornea, and the near region has a predetermined base power at the lens center O and adds a positive fixed power to an aspherical reference power within a predetermined radial range of a virtual aspherical lens that completely offsets the positive vertical spherical aberration caused by the cornea, and the near region has at least three sub-regions arranged radially, wherein sub-region 1 provides a positive power deviation for the positive fixed power, sub-region 2 provides an approximately zero power deviation for the positive fixed power, and sub-region 3 provides a negative power deviation for the positive fixed power.

Provided in the embodiments of the present application is a megawatt parallel pipe type charging pile cable, specifically: the cable comprises a sheath assembly, a main power line, cooling pipes and core wires; wherein the cooling pipes are at least 4 in number; the sheath assembly covers the main power line, the cooling pipes and the core wires; the cooling pipes are arranged in close contact with the sheath assembly, and the cable is centrally provided with the core wires; the cooling pipes are distributed at equal intervals; the main power line comprises positive power lines and negative power lines, and the positive power lines and the negative power lines are arranged in one-to-one correspondence and symmetry; the positive power lines and the corresponding negative power lines are arranged in close contact with different cooling pipes, respectively. The present application adopts a multi-core split design for the main power line comprising positive power lines and negative power lines, each independent core wire is closely attached to the outer wall of the cooling pipe, heat conduction is strengthened through direct contact, and heat is efficiently transferred vertically to the cooling liquid.

This application provides a power supply device, an atomizing device, an electronic atomizing device, and a communication method. The power supply device may include a first switch module and a main control module electrically connected to the first switch module, the main control module being configured to control the operating state of the first switch module. The operating states of the first switch module include a first state, a second state, and a third state. In the first or third state, the first switch module is configured to output a high-level signal. In the third state, the first switch module is also configured to output an original waveform signal to the main control module. In the second state, the first switch module is configured to output a low-level signal. When the power supply device and the atomizing device interact, the positive power supply line can be reused, eliminating the need for a separate communication line, reducing the space occupied by the line and the size of the electronic atomizing device, and lowering costs.

The invention provides a photovoltaic-storage-charging cooperative control and high-quality power supply method under limited measurement of a power distribution network. The method comprises the following steps: acquiring a system operation condition and aggregation power; judging whether to update the power regulation and control instruction or not based on the system operation condition; if yes, whether the current regulation and control level needs to be reset or not is judged based on the system operation condition; if not, updating the power regulation and control instruction based on the system operation condition, the aggregation power and the current regulation and control level; correcting the power regulation and control instruction to obtain a corrected power regulation and control instruction; distributing the corrected power regulation and control instruction, and carrying out corresponding regulation and control; judging whether the current regulation and control level reaches the maximum regulation and control level or not; and if yes, ending updating the power regulation and control instruction. According to the method provided by the invention, management and control of the voltage and the load rate of the power distribution network can be considered under the condition of limited measurement information through multi-stage regulation and control and feedback correction. Meanwhile, by setting the regulation and control priorities of photovoltaic, energy storage, charging piles and other resources, the photovoltaic utilization rate is improved.

To provide a motor control device of an electric compressor capable of suppressing inaccurate position estimation of a motor (rotor) due to superimposition of a harmonic voltage on a voltage command.SOLUTION: A motor control device 100 includes a PWM calculator 204 that generates a PWM signal for controlling a motor 910 on the basis of an addition value obtained by adding a harmonic voltage command value to a voltage command value for driving the motor 910, and a dead time corrector 213 that corrects a dead time for a power conversion unit 10. The dead time corrector 213 calculates the corrected harmonic current by correcting the phase of the harmonic current based on the output delay Tdel and the frequency ω h of the harmonic current, and corrects the dead time based on the corrected harmonic current and the corrected primary current obtained by correcting the primary current based on the output delay Tdel and the frequency ω of the primary current.SELECTED DRAWING: Figure 4

This invention discloses a compact waveguide collimation system and its application. The system, along the optical axis, sequentially includes a first lens group, an aperture stop, a second lens group, a prism-equivalent lens, a window protective sheet, and an image plane position. The first lens group effectively corrects aberrations and chromatic aberrations through a combination of a double-layered positive power meniscus lens and a cemented lens. The second lens group uses a negative power biconcave lens for beam expansion combined with a symmetrical lens structure to reduce the difficulty of aberration correction. The system uses spherical mirrors and glass materials throughout. By optimizing the optical power, surface shape, and relative positions, it achieves high collimation, high relative illumination, low distortion, compact structure, and low cost, making it suitable for optical waveguide display systems.

The invention discloses a test circuit, a surge elimination circuit and a surge elimination method. The surge elimination circuit is coupled between the positive power supply end and the negative power supply end of the test circuit. The surge cancellation circuit includes an impedance element and a first relay switch. The first relay switch is connected in parallel with the impedance element. When the test circuit stops supplying power, the first relay switch is turned on to form a first discharge path. The first discharge path is used for discharging a discharge current generated by the test circuit due to the back electromotive force. After discharging through the first discharge path for a first time, the first relay switch is turned off, and the impedance element forms a second discharge path. Therefore, the surge can be eliminated.

The utility model discloses a garlic cutting device based on garlic tip / root identification, which belongs to the technical field of garlic planting equipment, and comprises a cutting device, a single board computer, a relay, an A / D converter, an air compressor and an SD card, the cutting device comprises a support plate, a power supply device, a control device, a driving device, a camera device, a garlic falling device, a turnover device and a seeding device; the single board computer comprises a mainboard, a USB interface, a GPIO output signal pin, a memory card slot, a power interface, an SCL pin and an SDA pin. The relay comprises a power supply anode interface, a power supply cathode interface, a signal end interface, a normally open interface, a normally closed interface and a common interface. The A / D converter comprises a power supply anode pin, a ground wire pin, an SDA pin, an SCL pin and an analog signal input pin. According to the utility model, the garlic planting efficiency and yield are improved by identifying the orientation of the garlic and adjusting the position of the garlic.

The utility model discloses an embedded host for a chemical analysis instrument in a laboratory, which belongs to the technical field of chemical laboratories and comprises a touch screen, a circuit board, an external interface and a power supply, the host is connected with a control unit of the chemical analysis instrument through an internet access 1 and is communicated with a laboratory server through an internet access 2, and the external interface is connected with the power supply. The host adopts a uniform 24V power supply module to supply power through a needle-shaped or hole-shaped circular connector, PIN serial number output is 1: + VO (positive power supply), 2:-VO (negative power supply), 3:-VO (negative power supply) and 4: + VO (positive power supply), a touch screen interface module is arranged on the circuit board and used for connecting a touch screen, a WIFI / Bluetooth module and a 4G / 5G module provide a wireless communication function, a serial port communication module supports an RS232 or RS485 interface, and a USB interface is arranged on the circuit board. The USB communication module 1 and the USB communication module 2 are respectively used for printing, communication expansion and program upgrading. According to the utility model, different types of chemical analysis instruments can be controlled by installing different embedded software.

The objective includes a first lens group having positive power and a second lens group having negative power and including a pair of meniscus lens components having concave surfaces facing each other. The first lens group includes a first lens situated closest to an object side and has positive power with a concave surface facing the object side. The objective includes three or more cemented lenses arranged closer to the object side than the pair of meniscus lens components, and satisfies the following conditional expressions.2.6≤φL⁢1 / DL⁢1≤16(1)0.1≤<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"< / annotation>< / semantics>R2⁢1⁢2<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"< / annotation>< / semantics> / f≤3.5(2)Here, φL1 and DL1 are an outer diameter and a thickness of the first lens. R212 is a radius of curvature of a surface closest to the image side in a first meniscus lens component among the pair of meniscus lens components. f is a focal length of the objective.

The application relates to the field of power supply circuits and electric energy storage systems, and discloses a full-life-cycle adaptive optimization scheduling method for an energy storage system of a micro-grid cluster, which comprises the following steps: acquiring polarization impedance data of each energy storage branch representing electrode interface charge transfer resistance and an operating state, and decomposing bus net load power into a transient high-frequency sequence and a steady-state low-frequency sequence; distributing high-frequency fluctuation according to the reciprocal of the polarization impedance, adjusting the virtual impedance gain of a power conversion unit control loop to make the output current change rate lower than the physical boundary of ion diffusion rate; and introducing carbon emission intensity weight and loss cost function to correct the power limit value. The application establishes the physical correlation between the battery kinetics and the power fluctuation frequency, smoothes the current waveform by using the virtual impedance adjustment technology, suppresses the concentration polarization and lithium precipitation phenomenon of the electrode interface, and essentially prolongs the service life of the energy storage system.

Embodiments of the present disclosure provide a driving backboard, a light-emitting substrate and a display device thereof, and relate to the technical field of display, which is used to reduce development cost and improve production yield. The driving backboard comprises a substrate, a driving circuit layer and a second conductive layer. The driving circuit layer is arranged on one side of the substrate. The driving circuit layer comprises a transistor, and the transistor comprises a channel portion, a first electrode, a second electrode and a control electrode. The driving circuit layer further comprises a first conductive layer, and the first electrode and the second electrode are located on the first conductive layer. The second conductive layer is arranged on the side of the driving circuit layer away from the substrate. The second conductive layer comprises a positive power line and a negative power line arranged at intervals, the positive power line is configured to be electrically connected to the positive electrode of a power supply, and the negative power line is configured to be electrically connected to the negative electrode of the power supply. The thickness of the second conductive layer is greater than the thickness of the first conductive layer. The driving backboard is used to drive a light-emitting device.

The utility model discloses a five-gluing endoscope objective lens optical system which is composed of a first optical assembly with negative focal power and a second optical assembly with positive focal power, wherein the first optical assembly and the second optical assembly are sequentially arranged from the object side. The first optical assembly is composed of protective glass, a first lens, a viewing direction prism interval and a second lens which are sequentially arranged from the object space to the image space along the main optical axis. The second optical assembly is a rod-shaped lens of a biconvex structure, the rod-shaped lens is formed by sequentially gluing a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object space to the image space along the main optical axis, the third lens, the fourth lens and the sixth lens are lenses with negative focal power, and the seventh lens is a lens with negative focal power. And the fifth lens and the seventh lens are lenses with positive focal power. According to the utility model, the effect of enough spacing for configuring the field-of-view steering prism is ensured, and the device has the advantages of small size, easy installation, high image quality and the like.

The invention belongs to the technical field of power supply circuits, and particularly relates to a four-quadrant direct-current linear adjustable power supply device and a working method thereof.The four-quadrant direct-current linear adjustable power supply device comprises a linear amplification circuit, a positive power supply selection circuit, a positive power supply adjustment circuit, a negative power supply selection circuit, a negative power supply adjustment circuit and an output stage circuit; an input signal is amplified to the output stage circuit through the linear amplification circuit, so that the positive power supply selection circuit outputs a corresponding adjustable positive voltage to a load through the positive power supply adjustment circuit and the output stage circuit, or the input signal is amplified to the output stage circuit through the linear amplification circuit; the negative power supply selection circuit outputs a corresponding adjustable negative voltage to a load through the negative power supply adjustment circuit and the output stage circuit; adjustable input positive voltage and input negative voltage can be obtained, meanwhile, the linear amplification circuit is matched with the output stage circuit to achieve linear continuous adjustable output within the range of + / -210V, and the wide-range, high-precision and four-quadrant working capacity is achieved.

The invention discloses a high-precision signal conditioning sampling circuit applied to a strain sensor, and the circuit is characterized in that a high-precision reference voltage source module is connected with a positive power supply and the strain sensor, and provides constant-voltage excitation for the strain sensor; the input end of the charge pump module is connected with a positive power supply and is converted into a negative power supply for output; the signal input end of the signal amplification module is connected with the strain sensor, and the signal amplification module is connected with a positive power supply and a negative power supply output by the charge pump module and is used for amplifying differential signals in a dual-power supply environment; the second-order filtering module is connected with the output end of the signal amplification module to filter noise signals; the A / D conversion module is connected with the output end of the second-order filtering module and converts analog signals into digital signals. A dual-power-supply environment is constructed through the charge pump module, so that the signal amplification module can work under a real dual-power-supply rail. And the problem of'zero dead zone 'or nonlinear distortion caused by common output swing limitation of a single-power operational amplifier is thoroughly eliminated.