324 results about "Negative power" patented technology

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 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 field of power device driving, particularly relates to the technical field of crosstalk suppression, and more particularly relates to a crosstalk suppression driving circuit. Through cooperative work of the driving module, the detection module, the buffering module and the clamping module, crosstalk is effectively suppressed while the switching speed is ensured. The driving module ensures normal switching action of the power device; the detection module converts the drain voltage change rate into a detection signal in real time, and recognizes the crosstalk risk in advance; the buffer module suppresses forward crosstalk by absorbing grid forward voltage spikes; the clamping module immediately conducts a low-impedance path from the grid electrode to the negative power supply when the detection signal exceeds a threshold value, and negative crosstalk is quickly eliminated. According to the design, the suppression circuit is only activated when the voltage change rate exceeds the standard, switching delay caused by a traditional fixed buffer circuit is avoided, accurate and rapid crosstalk suppression can be achieved, and finally the suppression effect and the system reliability are remarkably improved while the high-speed switching performance is maintained.

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 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 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 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.

The invention discloses a hybrid self-switching bidirectional wireless switched reluctance motor driving system provided and realized by the invention. An independent demagnetization loop is arranged on the motor side, rapid demagnetization is allowed, and energy recovery is achieved. The system wirelessly drives a multi-phase SRM through a single power transfer channel using a single resonant frequency to reduce coupling between multiple power channels. When the WPT system is in forward power, the LCC-S compensation network is adopted to drive the motor load, and the advantage of constant voltage gain when the load changes is achieved; the LCC-LCC / S hybrid self-switching compensation network is adopted to realize charging of a battery load, and has a constant voltage / constant current characteristic; and when the WPT system has negative power, the LCC-LCC compensation network is adopted to realize reverse recovery of energy, and energy interconnection between the motor and the power grid is realized. In addition, an SR motor does not need to be specially designed, and the system has the remarkable advantages of phase current balance, flexible transmission distance, high integration level, maintenance-free property and the like.

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

The 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.

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.

Embodiments of the present application provide a display panel, a driving method and a driving module thereof, and a display device. The display panel comprises at least two partitions, at least two first power voltage signal lines and at least two first initialization signal lines. One partition comprises at least one sub-pixel, and the sub-pixel comprises a light emitting element. The first electrodes of the light emitting elements in the at least two partitions are connected to different first initialization signal lines. The second electrodes of the light emitting elements in the at least two partitions are insulated from each other. The second electrodes of the light emitting elements in the at least two partitions are connected to different first power voltage signal lines. The first initialization signal lines are used to transmit first initialization signals for initializing the first electrodes of the light emitting elements. The first power voltage signal lines are used to transmit negative power voltage signals. The embodiments of the present application are beneficial to reducing the initial cross-voltage difference and the brightness difference of the light emitting elements in different partitions.

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.

The utility model discloses a power distribution terminal battery management box capable of quickly replacing batteries. The power distribution terminal battery management box comprises an outer box, an inner box, a protection module and a driving module, the outer box comprises a cover plate, a first connecting hole, a second connecting hole, a sliding rail and a pulley; the inner box comprises an inner box handle and a battery mounting box; the protection module comprises an overcurrent protection module, an overheating protection module and a switch; the driving module comprises a driving handle, a connecting rod, a pressing plate and positive and negative electrode contact points; the positive and negative contact points are electrically connected with a wiring terminal, and the wiring terminal passes through the protection module and then leads out a pair of positive and negative power lines to the outside of the outer box; the device adopts a modular wiring structure, can be matched with a power distribution terminal battery for use, improves the working efficiency of on-site battery replacement, reduces short circuit hidden dangers caused by complex battery wiring and the like, and effectively guarantees personal and power grid safety.

This utility model relates to the field of LED lamp color temperature adjustment technology, specifically to a resistive LED lamp color temperature adjustment module, including a positive power input terminal DC+, a negative power input terminal DC-, a DIP switch CN1, a dual-color lamp board, a first resistor network, a second resistor network, a third resistor network, and a fourth resistor network. The positive power input terminal DC+ is connected to the positive terminal of the dual-color lamp board; the negative power input terminal DC- is connected to the DIP switch CN1; the negative terminal of the dual-color lamp board is connected to the DIP switch CN1; the first, second, third, and fourth resistor networks are respectively connected to the DIP switch CN1 and the negative terminal of the dual-color lamp board; the resistance values ​​of the first, second, third, and fourth resistor networks are all different. This module achieves multi-level color temperature adjustment, is simple and reliable in design, easy to produce and maintain, and has low manufacturing costs.

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 invention discloses a hoisting equipment transmission abnormity detection method, which comprises a frequency converter, a motor and a PLC, the frequency converter drives the motor, and the real-time power of the frequency converter is connected to the analog quantity input channel of the PLC through the analog quantity output channel of the frequency converter; when the hoisting equipment descends, the motor is in a power generation state, the power of the motor is negative, and after the hoisting equipment descends and a band-type brake is opened, the PLC compares and judges the sampled real-time operation parameters, and when the real-time operation parameters exceed a preset characteristic range and the state lasts for exceeding a set delay time, the PLC sends the real-time operation parameters out of the preset characteristic range. And the PLC sends an instruction to control the lifting equipment to stop. Accurate detection and timely shutdown of abnormal conditions in the lowering process of the variable-frequency driving hoisting equipment can be achieved, accident expansion is effectively avoided, the state of the hoisting equipment is judged through positive and negative power changes, and after the PLC detects that the power is larger than zero and lasts for exceeding the set delay, the hoisting equipment is immediately controlled to be shut down.

The application belongs to the technical field of integrated circuits, and specifically discloses a digital control programmable gain amplifier chip, which adopts an SIP packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, an alternating current signal is input from the Vin end, is connected to the inverting 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 to a positive electrode VDD of a power supply, a negative power supply pin is connected to the ground, a same-phase input end obtains a VDD / 2 direct current bias voltage through a precision resistor voltage dividing network and is connected after low-pass filtering, a high end of the digital potentiometer is connected to the Vout end, a low end is connected to the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The operational amplifier and the digital potentiometer are integrated, high integration and modularization of the programmable gain amplification circuit are realized, and the problems of insufficient gain precision, decreased reliability of a multi-element system and large circuit volume caused by the on-resistance of an analog switch in a traditional discrete scheme are solved.

This application provides a relay driving circuit and a charging device. In the relay driving circuit, the cathode of a first diode is used to receive a preset positive voltage signal, and the cathode of a second diode is used to receive a preset negative voltage signal. The anodes of the first and second diodes are connected. One end of a first charging circuit is connected to the cathode of the first diode, and the other end is connected to the anode of the first diode. The output terminal is connected to the input terminal of a first comparison unit. The positive and negative power supply terminals of the first comparison unit are respectively connected to the cathode and anode of the first diode. One end of a second charging circuit is connected to the cathode of the second diode, and the other end is connected to the anode of the second diode. The output terminal is connected to the input terminal of a second comparison unit. The positive and negative power supply terminals of the second comparison unit are respectively connected to the cathode and anode of the second diode. The output terminals of the first and second driving modules are respectively connected to two terminals on the coil of the relay to be controlled.

The present disclosure provides a point-control lamp and a lamp string, wherein the point-control lamp includes a lighting component, a direct-insert LED support, and an injection-molded part. The direct-insert LED support includes a signal input part, a positive power connection part, and a negative power connection part. The lighting component includes a main control chip and multiple lighting chips. The lighting component is arranged inside the injection-molded part, and the direct-insert LED support passes through the injection-molded part and connects to the lighting component. The main control chip is electrically connected to the signal input part. The main control chip is also electrically connected to the positive power connection part, and the main control chip is also electrically connected to the negative power connection part. The lighting chips are electrically connected to the main control chip. The main control chip is configured to store a number address of the point-control lamp. Arranging a separate signal transmission line and matching with packaging addresses the issue of signal stability being affected by the power supply when the signal is transmitted through traditional power lines, thereby increasing the maximum number of lamps that can maintain stable signals, reducing costs, and improving user experience.

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.

The application discloses a power semiconductor module packaging structure. The structure comprises a first heat sink, a first chip module and a second chip module; the first chip module and the second chip module are symmetrically arranged on the two sides of the first heat sink; the first chip module comprises a first substrate, a first power chip, a second power chip, a first positive power input terminal, a first negative power input terminal and a first phase power output terminal; the second chip module comprises a second substrate, a third power chip, a fourth power chip, a second positive power input terminal, a second negative power input terminal and a second phase power output terminal; the first substrate, the first power chip, the second power chip, the first positive power input terminal, the first negative power output terminal and the first phase power output terminal are symmetrically arranged with the second substrate, the fourth power chip, the third power chip, the second negative power input terminal, the second positive power output terminal and the second phase power output terminal, so that the commutation paths are completely overlapped.

The embodiment of the invention provides an analog switch, and relates to the technical field of CMOS. The analog switch comprises a first P-type switch, a second P-type switch, a first N-type switch, a second N-type switch, a first operational amplifier, a second operational amplifier, a first potential adjusting module and a second potential adjusting module. The first operational amplifier enables the D end of the analog switch to be the same as the substrate VDF potential of the first P-type switch and the substrate VDF potential of the first N-type switch, and the second operational amplifier enables the S end of the analog switch to be the same as the substrate VSF potential of the second P-type switch and the substrate VDF potential of the second N-type switch. The clamping effect of the first operational amplifier and the second operational amplifier suppresses the leakage current of the parasitic diode. When the analog switch is in a turn-off state, the first potential adjusting module pulls a connection point of the first P-type switch and the second P-type switch to a negative power supply potential, and the second potential adjusting module pulls a connection point of the first N-type switch and the second N-type switch to a positive power supply potential.