581 results about "Positive power" patented technology

The utility model discloses a prime lens. The prime lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has focal power; the fourth lens has positive focal power; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface; the eighth lens has positive focal power; the ninth lens has negative focal power; the object side surface of the tenth lens is a convex surface, and the image side surface of the tenth lens is a concave surface; wherein the sixth lens, the seventh lens and the eighth lens form a three-bonding lens group which is bonded with each other.

The invention, which relates to the technical field of power grid electrical equipment monitoring, discloses an electrical equipment abnormal power state monitoring system comprising a data acquisition module, a data processing module, a monitoring analysis module and a management module. The monitoring analysis module comprises a power reference offset sub-module, a power fluctuation sub-module and a comprehensive abnormal power risk sub-module, the abnormal power state monitoring effect of the electrical equipment can be remarkably improved, the influence of multiple factors on power reference offset is considered by the system, the power reference can be accurately corrected, and power grid interaction factors can be effectively improved. Therefore, the abnormal power risk can be comprehensively and accurately assessed based on the power reference offset, the power fluctuation stability and multiple factors, so that the safe and stable operation of a smart power grid and a large-scale power grid can be powerfully ensured.

A battery pack including a housing and a switching circuit. The housing supports a battery cell. The housing includes an interface for an electronic device. The interface includes a first positive power terminal and a second positive power terminal connected to the battery cell. A first negative power terminal and a second negative power terminal are connected the battery cell. The switching circuit operable to control the interface into a first configuration where power from the battery cell is only transferred from the battery cell to the electronic device using the first positive power terminal and the first negative power terminal, and control the interface into a second configuration where power from the battery cell is transferred from the battery cell to the electronic device using the first positive power terminal, the second positive power terminal, the first negative power terminal, and the second negative power terminal.

The present disclosure relates to a sensor controller including transmission drivers each having a negative and a positive power supply terminal, each of the transmission drivers being configured to generate a signal waveform transitioning between first potential and second potential and output the signal waveform to a corresponding detection electrode, and an intermediate potential supply unit having a potential generation circuit that includes a voltage source or a capacitive element separate from the transmission drivers, the intermediate potential supply unit being configured to output a voltage from the potential generation circuit at first timings at which a potential of a signal waveform starts to transition from the first potential to the second potential or from the second potential to the first potential, to supply the intermediate potential between the first potential and the second potential to at least one of the positive or the negative power supply terminal.

The present invention relates to the field of ultrasonic cleaning. The present invention discloses an ultrasonic cleaning machine, comprising: a power supply assembly, the power supply assembly includes a bottom box, a positive power supply column, and a negative power supply column; a cleaning assembly, the cleaning assembly includes a chamber body, a power supply board, and an ultrasonic transducer. A cleaning groove is provided on the chamber body. The power supply board supplies power to the ultrasonic transducer. A positive contact piece and a negative contact piece are provided on the power supply board. The power supply board abuts against the bottom wall of the chamber body. The positive power supply column passes through the avoidance through hole and abuts against the positive contact piece, and the negative power supply column passes through the avoidance through hole and abuts against the negative contact piece; a connection assembly, the connection assembly includes a first magnet provided on the chamber body and a second magnet provided on the bottom box. The ultrasonic cleaning machine well improves the poor vibration transmission caused by poor assembly after replacement by the user. In addition, the connection between the cleaning assembly and the power supply assembly is ensured to be reliable and convenient.

A full-bridge power converter is provided. The full-bridge power converter includes a transformer circuit, an input-side circuit, an output-side circuit, and a controller. The input-side circuit includes an input-side full-bridge circuit and an input inductor. The input-side full-bridge circuit includes multiple power switches. The input inductor is coupled between a positive power terminal of the battery module and the input-side full-bridge circuit. The output-side circuit includes an output-side full-bridge circuit and an output capacitor. The controller turns on the power switches during a first period, causing the transformer circuit to release an electric energy stored in the transformer circuit. The controller turns on the power switches during a second period after the first period, and controls the output-side full-bridge circuit to precharge the output-side full-bridge circuit by using an energy stored in the output capacitor.

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 belongs to the technical field of integrated circuits, and particularly discloses a numerical control programmable gain amplifier chip, which adopts an SIP (Session Initiation Protocol) packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, and is characterized in that an alternating current signal is input from the Vin end and is connected to an inverted input end of the operational amplifier through a capacitor C1 and an input resistor R1; a positive power supply pin of the operational amplifier is connected with a power supply positive electrode VDD, a negative power supply pin is grounded, and a VDD / 2 direct current bias voltage is obtained by an in-phase input end through a precision resistance voltage dividing network and is accessed after low-pass filtering; the high end of the digital potentiometer is connected with the Vout end, the low end is connected with the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The digital potentiometer and the operational amplifier are integrated, high integration and modularization of the programmable gain amplification circuit are achieved, and the problems that in a traditional discrete scheme, due to analog switch conduction resistance, gain precision is insufficient, reliability of a multi-element system is lowered, and the circuit size is large are solved.

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 relates to the technical field of friction power generation, in particular to an energy collection and vibration sensing device and system for a transmission line, which comprises a shell, a vibration sensor arranged in an inner cavity of the shell, and energy collectors arranged at the upper end and the lower end of the vibration sensor respectively. The vibration sensor comprises a balancing weight, and elastic pieces are arranged between the upper end and the lower end of the balancing weight and the adjacent energy collectors respectively. A positive friction piece is installed on the outer ring of the balancing weight, and a negative friction piece is installed on the inner wall of the shell. The positive friction piece can move up and down along with the balancing weight and make contact with the negative friction piece so as to generate electric signals. The energy collector comprises a positive electrode power generation membrane group and a negative electrode power generation membrane group which are oppositely arranged up and down and can make contact with each other and achieve friction power generation, one of the positive electrode power generation membrane group and the negative electrode power generation membrane group abuts against the shell, and the other abuts against the end, away from the balancing weight, of the elastic piece.

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 invention discloses a general constant current source adapter based on a single power supply-positive and negative symmetric power supply converter, which is characterized in that a voltage follower based on an operational amplifier can convert single power supply into positive and negative symmetric dual power supply, and output voltage of the operational amplifier A1 is subjected to power amplification through a complementary push-pull circuit to form a positive and negative symmetric power supply with relatively high power; the in-phase proportion operation circuit based on the operational amplifier can amplify the reverse constant current source control voltage and the forward constant current source control voltage, and the amplified control voltages respectively drive corresponding transistors of the complementary push-pull amplification circuit to be switched on. A positive power supply and a negative power supply of the positive and negative symmetrical dual power supplies respectively provide voltage sources for the constant current range switching circuit through the correspondingly conducted transistors, and the current passing through the constant current range switching circuit is equal to the current passing through the load RL. Through switching of the switch S1, the reverse constant current source control voltage and the forward constant current source control voltage can change the current direction passing through the load RL.

The utility model provides a vehicle end diode detection circuit, which comprises a standby controller and a detection circuit, the equipment controller comprises a U1A, a positive power interface of the U1A is connected with + 12V voltage, a negative power interface of the U1A is connected with-12V voltage, an inverted input end of the U1A is connected with a resistor R2, the other end of the resistor R2 is connected with 3.3 V voltage, the inverted input end of the U1A is connected with a resistor R1, the other end of the resistor R1 is grounded, and the detection circuit is connected with the standby controller. And the voltage is 3.3 V, the R2 and the R1 provide reference voltage for the U1A, and the normal phase input end of the U1A is connected with a resistor R3. The arrangement of the equipment controller and the detection circuit is beneficial to detecting whether the vehicle end diode D1 of the electric vehicle exists or not.

The invention discloses a low-ripple closed-loop negative-voltage charge pump circuit in the technical field of analog integrated circuits, and the circuit comprises a charge pump closed-loop modulation circuit, the output end of the charge pump closed-loop modulation circuit is connected with the low-ripple negative-voltage charge pump circuit, and the low-ripple negative-voltage charge pump circuit is used for receiving positive power supply voltage input and outputting negative power supply voltage; the low-ripple negative-voltage charge pump circuit comprises a charge pump module, the first end of the charge pump module is connected with the first end of the positive power supply filter capacitor and the output end of the charge pump closed-loop modulation circuit, and the charge pump module outputs an output signal through the first end. By fixing the switching frequency of the low-ripple closed-loop negative-voltage charge pump circuit, the influence of switching noise on the system is reduced without repeatedly starting and stopping or changing the switching frequency of the charge pump, meanwhile, the size of a positive power supply is adjusted in a closed-loop mode through a negative feedback loop, and the voltage of the positive power supply of the charge pump is dynamically compensated. And the output voltage excursion of the traditional charge pump under large current is reduced.

The invention relates to a power module unit, which comprises a lining plate, a first power chip, a second power chip, a positive power terminal, a negative power terminal and an output power terminal, the lining plate comprises an insulating plate body and a first conductive layer arranged on the upper side face of the insulating plate body. The first conductive layer comprises a first conductive area, a second conductive area and a third conductive area which are sequentially arranged at intervals in the first direction. The first power chip is connected between the first conductive region and the second conductive region, and the second power chip is connected between the second conductive region and the third conductive region to form a power circuit; the positive power terminal is connected with the first conductive area, the output power terminal is connected with the second conductive area, and the negative power terminal is connected with the third conductive area. The invention further provides a power module and a vehicle. According to the invention, the current flowing path of the power module unit is shortened, the inductance offset scheme of the power module unit is optimized, and the parasitic inductance of the power module unit can be obviously reduced.

The invention relates to the technical field of electric energy quality optimization, in particular to an intelligent waterproof and anti-electric shock energy-saving and environment-friendly method and terminal equipment, and the method comprises the steps: collecting the voltage, current and reactive power data of each phase of a user side in an industrial power system in real time; presetting an adjustment period of a power factor, and obtaining the current and voltage waveform deviation degree of any phase; obtaining a current, voltage deviation sequence and a power deviation sequence of any phase; obtaining the deviation correlation degree of industrial equipment in the industrial power system, and obtaining the load responsivity of the industrial power system in combination with the extreme point distribution coefficient of the industrial power system; and obtaining the domain of discourse of fuzzy PI control in the next adjustment period adjacent to each adjustment period, and correcting the power factor. The invention aims to reduce the equipment loss, prolong the service life of an electric appliance and improve the electric energy quality by realizing the efficient correction of the power factor, thereby reducing the electric energy waste.

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 discloses a modular multilevel converter power subunit overvoltage breakdown circuit and a control method in the technical field of flexible AC / DC power transmission. The modular multilevel converter power subunit overvoltage breakdown circuit comprises an overvoltage trigger circuit, a driving circuit, a clamping circuit and a switching circuit, the overvoltage trigger circuit is connected between a collector electrode and a gate electrode of a power device of the power subunit, one end of the clamping circuit is connected with the gate electrode of the power device of the power subunit through a first switch S1, and the other end of the clamping circuit is connected with a positive power supply VCC of the driving circuit; the turn-on branch of the driving circuit is connected with the gate pole of the power device of the power subunit through a second switch S2, and the turn-off branch of the driving circuit is connected with the gate pole of the power device of the power subunit through a third switch S3. According to the invention, the overvoltage breakdown bypass of the power subunit of the modular multilevel converter can be realized under the working condition of power loss of the circuit, the normal work of the driving and clamping circuit is not influenced, and the reliability of the fault bypass of the subunit of the modular multilevel converter is 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 discloses a PID test system of a photovoltaic module. The photovoltaic module comprises a positive electrode end, a negative electrode end and an outer frame end. The PID test system of the photovoltaic module comprises an irradiance acquisition module, a power supply module and a controller, wherein the irradiance acquisition module is used for acquiring outdoor light irradiance received by the photovoltaic module; the power module comprises a positive power supply end and a negative power supply end; the anode power supply end is electrically connected with the anode end, and the cathode power supply end is electrically connected with the outer frame end; the power module is used for providing power signals; the controller is electrically connected with the irradiance acquisition module and the power supply module respectively; and the controller is used for controlling the power supply module to output a power supply signal according to the outdoor light irradiance. According to the technical scheme of the invention, the authenticity and reliability of the PID test can be improved, and the reference of the PID test system to the test result of power attenuation can be improved.

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.

This invention provides a method, apparatus, device, and medium for correcting control rod calibration curves. The correction method includes: acquiring a reference temperature curve during a load reduction period; correcting the reference temperature curve based on the negative reactivity introduced by xenon to generate a xenon correction curve; calculating an overheat correction curve based on a set balance coefficient, a primary loop completely untracked curve, and the xenon correction curve; calculating the power data in the overheat correction curve and its corresponding overheat correction power data based on the overheat correction curve and the reference temperature curve, and generating an overheat correction parameter set; and correcting the control rod calibration curve based on the overheat correction parameter set to generate a corrected control rod calibration curve. The method, apparatus, device, and medium provided by this invention can correct control rod calibration curves to adapt to different generating units.

An optical system disclosed in an embodiment of the invention may include first to third lens groups arranged along an optical axis from an object toward a sensor side and each including at least one lens, wherein: the first lens group and the third lens group have negative power; the second lens group has positive power; the position of the first lens group is fixed; each of the second and third lens groups is movable along the optical axis according to an operation mode; a first lens closest to the object among the lenses of the first lens group has negative power; and the absolute value of the effective focal length of the third lens group is greater than the product of the absolute values of effective focal lengths of the first and second lens groups.

This application relates to the field of SAM projection lens technology, providing a SAM projection lens and projection device. The SAM projection lens includes a rear group and a front group arranged sequentially from the object side to the image side along the optical axis. The rear group includes a positive power lens, an aperture stop, and three cemented doublets. The cemented surfaces of the three cemented doublets partially bulge towards the aperture stop and partially bulge away from it. The front group includes a negative power lens and two cemented doublets, one of which has a negative power. The SAM projection lens and projection device provided in this application can guarantee brightness, achieve a large atmospheric back focus, and provide high image quality at a low cost.

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.