940 results about "Positive power" patented technology

The invention provides an optical lens, which sequentially comprises a first lens with negative focal power from an object side to an imaging surface along an optical axis, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power from the object side to the imaging surface, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface; and the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface. According to the optical lens, through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens can be improved, and the optical lens has the advantage of being good in imaging quality.

The invention provides an optical lens, which comprises seven lenses from an object side to an imaging surface along an optical axis: a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power, the object side surface of the second lens near the optical axis is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface near the optical axis; the object side surface of the fourth lens is a convex surface near the optical axis, and the image side surface of the fourth lens is a concave surface near the optical axis; the object side surface of the fifth lens is a concave surface near the optical axis, and the image side surface of the fifth lens is a concave surface near the optical axis; the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface near the optical axis, and the image side surface of the sixth lens is a concave surface near the optical axis; and the object side surface of the seventh lens is a convex surface near the optical axis, and the image side surface of the seventh lens is a concave surface near the optical axis. The optical lens provided by the invention has one or more advantages of short total length, large aperture, small distortion and the like.

The invention provides a fault ride-through control method and device for a network construction type converter, and relates to the technical field of control. The method comprises the steps that if it is determined that the voltage amplitude of an alternating-current bus is smaller than the output grid-connected point voltage of a reactive loop, a control switch is turned on; the I coefficient, the D coefficient and the P coefficient are sequentially adjusted, the power deviation, the generalized inertia coefficient and the generalized damping coefficient are corrected by improving the electromagnetic active power until the grid-forming converter reaches fault ride-through, and the I coefficient, the D coefficient and the P coefficient at the moment are determined to be target parameters of the angular frequency PID compensator; and if it is determined that the AC bus voltage amplitude is greater than or equal to the reactive loop output grid-connected point voltage, the control switch is turned off. The device executes the method. According to the method and the device provided by the embodiment of the invention, the transient stability of the network-forming converter can be improved.

The invention discloses an optical lens and electronic equipment. The optical lens sequentially comprises a first lens with focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power from a first side to a second side along an optical axis. The number of the lenses with focal power in the optical lens is seven; the optical lens meets the following conditions:-2 < = F3 / F < =-0.5, 0.25 < = R6 / R7 < = 1.5 and-20 < = F1 / F < = 20, F3 is the effective focal length of the third lens, F is the effective focal length of the optical lens, R6 is the curvature radius of the second side surface of the third lens, R7 is the curvature radius of the first side surface of the fourth lens, and F1 is the effective focal length of the first lens.

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 provides an optical imaging apparatus. The optical imaging device comprises a lens barrel, a lens group and a spacing element group, and the lens group and the spacing element group are assembled in the lens barrel. The lenses comprise a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power and a seventh lens with negative focal power; the following conditions are satisfied: 78 degree lt; the method comprises the following steps: carrying out half-FOVlt; 91 DEG; the following conditions are satisfied: 1.7 lt; dT11 / DT12lt, and DT11 / DT12lt; 2.1); the following conditions are satisfied: 2.45 lt; (d0s-d1s) / EP01 is smaller than or equal to 3.15. The optical imaging device solves the problem that in the prior art, an optical imaging device with seven lenses meets the ultra-wide angle requirement, and consequently the direction of marginal light affects the imaging quality.

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.

The invention discloses a grid control field sequence circuit and method, and the circuit comprises M rows of sub-circuits, each sub-circuit comprises a compensation unit, and each compensation unit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, and a pre-storage capacitor. A first source-drain electrode of the first transistor is coupled to a positive power line, and a second source-drain electrode of the first transistor is coupled to a second source-drain electrode of the second transistor and a first source-drain electrode of the third transistor; a first source drain electrode of the second transistor is coupled to a grid electrode of the third transistor and one end of the pre-storage capacitor; the second source electrode of the third transistor of the sub-circuit of the Nth row is coupled to the first source drain electrode of a fourth transistor, and the second source drain electrode of the fourth transistor is coupled to a data signal line. The beneficial effects of the invention are that the threshold voltage is written in advance by using the conduction characteristic of the transistor, thereby avoiding the image abnormity phenomenon caused by the drift of the threshold voltage.

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 embodiment of the invention provides a lens, a display module, a vehicle lamp device, electronic equipment and a vehicle. The lens comprises at least five lenses arranged from the image side to the object side in the optical axis direction. At least three lenses in the at least five lenses have positive focal power, at least one lens has negative focal power, and when the number of the lenses with the negative focal power in the lens is one, the lens with the negative focal power in the lens is arranged between the lens closest to the image side in the lens and the lens closest to the object side in the lens in the optical axis direction. The lens provided by the embodiment of the invention can have the characteristics of a large aperture and a large field angle at the same time, so as to meet the use requirements.

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.

A driveline and driveline system for an active implantable device provides for communication over the power conductors in the driveline. The driveline includes four conductors, two for the positive power connection and two for the negative power connection. Communication in the driveline is performed using Power Line Communication (PLC) technology on the four conductors, superimposing a communication signal on the conductors such that the four conductors provide both power and communication capability. The four conductors provide redundant paths for both power and communication, so the failure of one of the conductors in the driveline does not affect operation of the driveline. The four conductor driveline cable and system provides a more robust driveline cable that does not fail with the failure of one of the conductors without increasing the diameter of the driveline, which would increase the risk of infection where the driveline passes through the skin.

The invention discloses an optical lens, which comprises seven lenses and a liquid lens, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface and the image side surface of the third lens are convex surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; a liquid lens with focal power, wherein the liquid lens presents different focal lengths according to different applied voltages; the fifth lens has positive focal power, and the object side surface and the image side surface of the fifth lens are convex surfaces; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface. The optical lens provided by the invention has the advantages of small total length, high relative illumination, high resolution and the like.

The invention relates to a level control circuit and electric equipment. The level control circuit comprises a level shift circuit, an enable signal processing circuit and a level determination circuit. The level shift circuit is used for receiving a first control signal corresponding to the first voltage domain, converting the first control signal into a second control signal corresponding to the second voltage domain, and outputting the second control signal. The enable signal processing circuit is connected with a first positive power supply end of the first voltage domain and a second positive power supply end of the second voltage domain, and outputs an enable signal on the basis of a second power supply voltage provided by the second positive power supply end under the condition that the first power supply voltage is not connected to the first positive power supply end. And the level determining circuit is connected with the enable signal processing circuit and the output end of the level shifting circuit, and is used for controlling the level of the output end of the level shifting circuit to be in a preset state according to the received enable signal. The level shift circuit is clear in output state and high in output reliability under the condition that the second positive power supply end provides the second power supply voltage.

The invention discloses a V / I source system with a wide voltage and current range. The V / I source system comprises a power amplifier U1, a parameter measuring unit, a compensating circuit, a current sampling circuit, a voltage sampling circuit, a positive power supply module, a clamping circuit and a mode selector, the positive power supply module is connected with the positive power supply end of the power amplifier U1; the parameter measuring unit is provided with a plurality of channels for respectively setting the output voltage / output current of the power amplifier U1 and the clamping voltage / clamping current of the clamping circuit and adjusting the output voltage of the positive power supply module; the compensation circuit can adapt to different capacitive loads so as to be used for adjusting the establishment time of the output voltage / output current of the power amplifier U1, and the output end of the power amplifier U1 supplies power to the DUT; the method is excellent in performance, the test quality can be improved, and the test cost is reduced.

To minimize the width of a non-light-emitting border region around an opening in the active area, data lines may be stacked in the border region. Data line portions may be formed using three metal layers in three different planes within the border region. A metal layer that forms a positive power signal distribution path in the active area may serve as a data line portion in the border region. A metal layer may be added in the border region to serve as a data line portion in the border region. Data line signals may also be provided to pixels on both sides of an opening in the active area using supplemental data line paths. A supplemental data line path may be routed through the active area of the display to electrically connect data line segments on opposing sides of an opening within the display.

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.

The invention discloses an optical lens. The optical lens sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with negative focal power from an object side to an image side along an optical axis, the first lens has positive focal power, the second lens has positive focal power, the eighth lens has positive focal power, the ninth lens has positive focal power, the tenth lens has positive focal power, the eleventh lens has negative focal power, and the twelfth lens has positive focal power. The number of the lenses with focal power in the optical lens is twelve.

The utility model provides an ultra-large aperture wide-angle high-pixel optical system and a camera module using the same, the ultra-large aperture wide-angle high-pixel optical system is mainly composed of nine lenses, the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, and the object side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, and the image side surface of the sixth lens is a convex surface; the seventh lens has negative focal power, and the image side surface of the seventh lens is a concave surface; the eighth lens has positive focal power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface; the ninth lens has focal power; through reasonable matching of the lens shape and the focal power, the lens has the advantages of ultra-large aperture, wide angle and high pixel, and meanwhile, the configuration of the large aperture can increase the light incoming amount of the optical system and improve the imaging quality.

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 invention provides an optical lens, which sequentially comprises a first lens with negative focal power from an object side to an imaging surface along an optical axis, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power from the object side to the imaging surface, 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 negative focal power, the object side surface of the third lens near the optical axis is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface; the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface. The optical lens provided by the invention has the advantage of excellent imaging quality through specific surface shape arrangement and reasonable focal power distribution.

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 an insulation detection circuit, method and device which can be used in the field of electronic circuits, the insulation detection circuit comprises a first switch, a second switch and a sampling branch, and the sampling branch comprises a divider resistor, a sampling resistor and a third switch; the sampling branch is connected with a positive power line through a first switch and connected with a negative power line through a second switch. The sampling branch is provided with a first part connected with the first earth impedance in parallel and a second part connected with the second earth impedance in parallel, the first part comprises at least one divider resistor and a sampling resistor, and the second part comprises at least one divider resistor; the third switch is connected in parallel with at least one divider resistor. Therefore, the sampling branch is connected only under the condition of insulation detection, the number of electronic components is small, the circuit structure is simpler, the size of insulation detection equipment can be effectively reduced, and the circuit cost is reduced.

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 invention provides a large-target-surface high-pixel projection lens which is provided with a first lens with positive focal power, and the image side surface and the object side surface of the first lens are convex surfaces; the image side surface of the second lens is a convex surface, and the object side surface of the second lens is a concave surface; the object side surface of the third lens is a concave surface; the image side surface and the object side surface of the fourth lens are convex surfaces; the fifth lens has positive focal power, the image side surface is a convex surface, the object side surface is a concave surface, a diaphragm is positioned between the first lens and the second lens, and the third lens and the fourth lens are glued to form a glued lens group; and the central thickness CT2 of the second lens and the half-image height IH of the projection lens satisfy 0.3 < = CT2 / IH < = 0.9. The projection lens can meet large-target-surface, high-pixel and large-view-field-angle display illumination, and also can meet the use requirements of good imaging quality.

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.