380 results about "Triode" patented technology

The utility model relates to a rear-phase-cut single-live-wire type wall light modulator, which comprises an MOS (Metal Oxide Semiconductor) tube switch loop unit, a singlechip control unit and a direct-current power supply unit, the MOS tube switch loop unit comprises a wiring terminal J2 connected with an MOS tube Q1, a grid electrode of the MOS tube Q1 is connected with four resistors in series in sequence and then is connected with an MOS tube Q2, a drain electrode of the MOS tube Q2 is connected with a diode D2, the diode D2 is connected with a diode D1, a fixed end contact of a single-pole double-throw switch is connected with the MOS tube Q2, and two movable end contacts of the single-pole double-throw switch are connected with the wiring terminal J1 and the wiring terminal J3 respectively; the direct-current power supply unit comprises an alternating-current voltage waveform acquisition circuit, a direct-current voltage drop circuit, an overcurrent protection circuit and a filtering voltage stabilizing circuit; according to the single-chip microcomputer control unit, a linear sliding potentiometer is connected with the PC2 end of a single-chip microcomputer after being connected with a resistor in series, the linear sliding potentiometer and a rotary potentiometer are sequentially connected between the output end of the direct-current power supply unit and the ground in series, a triode Q6 is connected with a triode Q5 and then connected with the collector electrode of a triode Q7, and the base electrode of the triode Q7 is connected with the PA6 end of the single-chip microcomputer after being connected with a resistor in series.

The invention relates to the technical field of battery charging protection circuits, and discloses a battery charging overcurrent checking circuit which comprises a triode PNP0, a substrate of a charging power tube PM0 is electrically connected with a base electrode of a PNP type triode PNP0, an emitting electrode of the triode PNP0 is connected with charging input voltage VIN, a collector electrode of the triode PNP0 is connected with one end of a resistor R1, and the other end of the resistor R1 is grounded; the negative input end of the comparator COMP is connected to a connection node of the triode PNP0 and the resistor R1 to obtain voltage VC, the output end of the reference voltage generation module is electrically connected with the positive input end of the comparator COMP to obtain reference voltage Vref, the output end of the comparator COMP outputs an overcurrent detection signal, substrate current of the charging power tube PM0 is adopted as a detection signal source, and the voltage Vref is detected through the detection signal source. A detection circuit is built by matching a PNP type triode PNP0 and a resistor R1, and an additional reference PMOS tube and a continuously working reference current source are omitted, so that the chip layout area is saved, and miniaturization of a charging chip is facilitated.

The utility model relates to a phase change thermo-acoustic engine experimental device which comprises a thermo-acoustic conversion system and an acoustic-electric conversion system. The thermo-acoustic conversion system comprises a sound production module and a Helmholtz resonant cavity, a ceramic plate stack soaked with water exists in the sound production module, and the stable temperature difference needed for generating the thermo-acoustic effect at the two ends of the ceramic plate stack is reduced. Sound waves generated by the thermoacoustic effect form standing waves in the Helmholtz resonant cavity, and the sound intensity is amplified; the acoustic-electric conversion system comprises piezoelectric ceramics and a triode common-emitter amplification circuit, the piezoelectric ceramics are arranged at the tail end of the resonant cavity and convert acoustic energy into electric energy, and the electric energy is amplified by the triode common-emitter amplification circuit and then drives a nixie tube to display. The experimental device integrates thermodynamics, fluid mechanics, acoustics, material science and electronic technology, has the characteristics of simple structure, low cost, rich physical process and strong exploration, is suitable for experimental teaching, particularly suitable for new engineering teaching requirements, and is beneficial to improving the multidisciplinary cross practice ability of students.

The invention provides a band-gap reference circuit, a current compensation method and a reference power supply. The band-gap reference circuit comprises a first triode module, a second triode module, a first resistor module, a second resistor module, a first compensation branch and a second compensation branch, the first compensation branch generates first compensation current, and the first compensation current compensates first current flowing into a third end of the first triode module from a first end of the first triode module. The first compensation current is equal to the first current. The second compensation branch generates second compensation current, the second compensation current compensates second current flowing into the third end of the second triode module from the first end of the second triode module, and the second compensation current is equal to the second current. The problems that the precision of the reference voltage output by the band-gap reference circuit is reduced, the temperature drift is increased, and the stability and reliability of the reference voltage are seriously influenced due to the fact that an existing band-gap reference circuit cannot guarantee accurate matching of collector currents of two branches of BJTs are solved.

The utility model discloses a kind of drive circuits, belong to electric bicycle instrument technical field, specifically related to a kind of electric bicycle instrument drive circuit, comprising: conversion module, output filter and high voltage surge suppression module;Output filter and high voltage surge suppression module are connected with conversion module;Conversion module includes: MOS tube Q6, MOS tube Q9, resistance R20, resistance R19, resistance R18, triode Q5 and triode Q10;Output filter includes: inductance L2, electrolytic capacitor C15, electrolytic capacitor C14, capacitor C13;High voltage surge suppression module includes: transient voltage suppression diode D5;The utility model uses wide input voltage range, high-efficiency switching power supply, replaces traditional linear voltage stabilizer, and efficiency is higher, and heat is smaller, and tolerance to input voltage fluctuation is better, while increasing greater capacity input electrolytic capacitor, effectively absorb transient surge and fill transient voltage drop, in addition, TVS diode is used to suppress high voltage surge, and self-recovery fuse is used to prevent overcurrent.

A semiconductor plug arrangement system and arrangement method, the system comprises: a vibrating disc, the inner wall is provided with a spiral material plate, the end of the spiral material plate is connected with a main material groove extending to the outside of the vibrating disc. A spiral groove is formed on the inner wall of the vibrating disc corresponding to the connecting part of the spiral material plate; a notch is formed on one side of the middle section of the main material groove, the width of the notch is greater than or equal to half of the width of the bottom plate of the main material groove, the notch is connected with a branch material groove, the branch material groove is communicated with the main material groove, a stop rod is arranged on the inner wall of the side plate opposite to the notch of the main material groove in parallel, the stop rod has a gap between the bottom plates of the main material groove, a notch is formed on the middle section of the stop rod, the width of the notch is greater than the width of the pin; the end of the branch material groove and the end of the main material groove are respectively connected to two ends of an arc track, and a material taking point is arranged on the middle section of the arc track. The scheme can multiply the number of triodes arranged and output by the vibrating disc, and effectively reduces the influence on the plug-in equipment lifting efficiency.

The embodiment of the present specification provides a synchronization trigger system and method for a pulse wind tunnel, the system comprising: a signal trigger module, a light source control module and a device control module; the signal trigger module is used for receiving a reference signal; the sending device and the receiving device for the reference signal are electrically isolated based on a circuit structure; the reference value of a trigger signal is set according to the isolated reference signal; whether the light source and the device are turned on or not is indicated according to the trigger signal and the reference value; the light source control module is used for controlling the flicker frequency of the light source based on a MOSFET and a triode; the device control module is used for controlling the start and stop of the device according to a preset delay. The technical scheme provided in the present application is used to solve the problem that the risks among the sub-circuits are related to each other and the performance applicability is not strong.

The application discloses a vertical parasitic NPN triode device and a manufacturing method thereof, and the vertical parasitic NPN triode device comprises the following steps: an N-type deep well is arranged on a P-type substrate, the N-type deep well is formed into a segmented structure on both sides of the P-type substrate at a corresponding position of an emission area, both ends of the segmented N-type deep well are connected to each other, and the N-type deep well serves as a collector area; a shallow trench isolation is arranged on an N well and a P well, the N well is arranged in the N-type deep well; the P well is arranged on an inner side of the segmented N-type deep well between the N wells, and serves as a base area; an N-type heavily doped area is arranged on a surface of the P well, and serves as the emission area; and a P-type heavily doped area is arranged on the surface of the P well, is arranged on both sides of the N-type heavily doped area, and is electrically connected to the P well to serve as a base area lead-out end. The application can overcome the defect that the low Early voltage of the existing vertical parasitic NPN triode is caused by the low net doping concentration of the base area, and meanwhile, the adverse effects caused by directly increasing the P well concentration of the base area on other devices of a process platform can be avoided.

The utility model relates to the technical field of industrial semiconductors, and discloses a device for detecting the working state of a lamp holder of ultraviolet light curing equipment, which integrates temperature, wind pressure and ultraviolet light intensity detection functions by optimizing the structure of a hardware circuit. The circuit comprises a switch type capacitor voltage converter, a linear voltage regulator, a phototriode, an NTC thermistor, a partial pressure sensor and a CAN communication module. Through the bidirectional TVS diode, RC filtering and two-stage voltage stabilization design, the anti-electromagnetic interference capability is improved, and the signal transmission reliability is improved; temperature, wind pressure and illumination detection circuits are integrated on a single board, the structure is simplified, and the space is saved; the standby energy consumption of the sensor is reduced through hardware power management; by comprehensively optimizing the circuit structure and the signal transmission path, the detection reliability of the working state of the lamp holder of the ultraviolet curing equipment is improved.

The invention discloses a novel elevator light curtain which comprises an all-plastic shell and a circuit board arranged in the all-plastic shell. The circuit board adopts a cascade multi-path switching module to gate a plurality of photoelectric units, and a grounding filter network is arranged at the output end of each photoelectric unit for source filtering; an active filtering buffer unit with a PNP triode as a core is introduced into a signal path, and a signal processing module comprising a four-stage operational amplifier and a gradient RC filtering network is adopted for step-by-step amplification and conditioning. Through systematic hardware circuit design, on the premise of not depending on metal shielding, internal and external electromagnetic interference is actively and multiply inhibited from the source to the terminal, meanwhile, the structure is simplified, the cost is reduced, the short circuit and failure risks possibly caused by shell grounding are thoroughly avoided, and higher reliability, environmental adaptability and economical efficiency are achieved.

This application discloses an MCU sleep / wake-up circuit, including a signal circuit, a second sleep control transistor Q2, a first hierarchical sleep control transistor Q1, an LDO chip U, and a control unit MCU. The signal circuit outputs a wake-up signal. The base of the second sleep control transistor Q2 is connected to the output terminal of the signal circuit through a current-limiting resistor R4, grounded through a voltage divider resistor R9, and connected to the enable terminal ENA through a current-limiting resistor R3. The enable terminal ENA is connected to the control unit MCU, the emitter is grounded, and the collector outputs a control signal. The control signal is input to the first hierarchical sleep control transistor Q1 through a bias voltage divider circuit. The emitter of the first sleep control transistor Q1 is connected to the power supply VIN, and the collector outputs the power supply voltage to the LDO chip U. The LDO chip U outputs its operating voltage to the control unit MCU. When the control unit MCU is working, it outputs a high level to the enable terminal ENA. This application can reduce the complexity of the sleep / wake-up system and achieve low-power sleep and reliable wake-up of the control unit MCU.

The utility model discloses an MOS tube hard switch control surge suppression circuit, which belongs to the technical field of power electronics, and comprises a control circuit, a drive circuit and a power switch circuit, the power switch circuit is composed of a high-power suppression resistor, a first MOS tube and a second MOS tube, the first MOS tube and the second MOS tube are connected in parallel, the source electrode of the MOS tube is connected with the positive electrode of the output power supply through the high-power suppression resistor, and the drain electrode of the MOS tube is connected with the negative electrode of the output power supply. Compared with the prior art, the control circuit of the circuit can automatically detect the voltage and change the conducting state of the triode based on the change of the voltage so as to control the on-off state of the MOS tube, when the voltage is too large, the high-power suppression resistor will intervene in the circuit to consume the voltage spike, it is ensured that the rear-end power supply voltage is stable, and the purpose of protecting rear-end equipment is achieved.

The invention provides a high-precision voltage-stabilizing constant-current power supply for continuous discharge of a CO2 laser, which relates to the technical field of high-voltage voltage-stabilizing constant-current power supplies and comprises a high-voltage direct-current voltage-stabilizing power supply and a high-impedance amplification loop. The high-voltage direct-current voltage-stabilized power supply is boosted by a transformer, rectified by a rectifier bridge and stabilized by a filter capacitor, and continuously adjustable high-voltage output of 0-30kV is provided; the high-impedance amplification loop is composed of an operational amplifier, a three-stage triode amplification circuit and an electronic tube, the output impedance reaches up to 650 megohms, and the high-impedance amplification loop has the excellent constant-current characteristic. The power supply can accurately adjust the output current in the range of 0-30mA, the current fluctuation is less than one thousandth, the power supply can continuously and stably operate for more than 18 hours, and the power supply is suitable for laser discharge control in a high-temperature and high-density plasma environment. According to the invention, high-precision output is realized by adopting common performance devices, the advantages of voltage resistance, overload resistance and cost are considered, and the problems of poor current stability and inconvenient adjustment of a traditional laser power supply are solved.

The utility model discloses a passive adjustable voltage clamping circuit with a temperature protection function, which comprises an input positive end IN +, an input negative end IN-, a diode D1, a diode D2, a diode D3, a triode Q1, a field effect transistor Q2, a triode Q3, a controllable precise voltage stabilizing source N1, a temperature sensor RT1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a slide rheostat R8, the input positive end IN + and the input negative end IN-serve as input power sources, the clamping circuit works passively and can bear very high power, and the bearing power depends on the peak power of the field efficiency tube; the clamping voltage is adjustable, the voltage precision is high, the error is controlled below 1%, the field effect transistor Q2 has an over-temperature protection function, the circuit is prevented from being damaged due to thermal breakdown when external high voltage lasts for a long time, the circuit is simple, the circuit is composed of discrete components, the cost is low, implementation is easy, and the cost performance is high.

The application belongs to the technical field of electronic circuits, and particularly relates to a low-temperature-drift high-PSRR op-amp-free bandgap reference circuit, which comprises MOS tubes M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12, M13, M14, M15, triodes Q1, Q2, Q3, resistors R1, R2 and R3; compared with the prior art, the circuit is an op-amp-free bandgap reference circuit, which avoids the influence of op-amp offset voltage on reference voltage and improves the accuracy of the reference voltage; the temperature coefficient of the reference voltage can be well adjusted by adjusting the resistance coefficient, so that the low-temperature-drift reference voltage is realized.

The utility model discloses a microwave motion inductive device, including circuit board, power interface, output interface, paster relay, circuit board has welded radio frequency module, radio frequency module electric connection has resistance module group and condenser module group, and power interface passes through triode and resistance module group and condenser module group and radio frequency module electric connection, and output interface and radio frequency module electric connection, and paster relay is welded on the circuit board, and paster relay is connected in parallel with triode, and paster relay passes through circuit board and resistance module group and condenser module group and radio frequency module electric connection, through triode to the power of power interface input plays the voltage stabilizing and current limiting effect, ensures radio frequency module and paster relay stable work, and the peak value and duration of surge current can be reduced with resistance module group, condenser module group, limit surge current size, improve radio frequency module and paster relay stable service life, and service life is long.

This invention discloses a primary-side feedback output no-load voltage stabilization circuit, including a transformer T1. One end of the N1 coil of the transformer T1 is connected to the voltage feedback pin of the main control unit U1, and the other end is grounded. One end of the N2 coil of the transformer T1 is connected to the collector of the transistor Q2 through a diode D2, and the VCC voltage output from the emitter is supplied to the VDD terminal of the main control unit U2. The cathode of the diode D2 is grounded through a capacitor EC1, and the cathode is also connected to the voltage terminal through resistors R9 and R10 respectively. The cathode of the diode D2 is also connected to the base of the transistor Q2 through a resistor R11, and the base is also grounded through a Zener diode ZD1.

This invention provides a low-level mute circuit, comprising: a first audio input terminal, a first audio operational amplifier circuit, a first audio differential output terminal, a mute circuit, a second audio input terminal, a second audio operational amplifier circuit, and a second audio differential output terminal. The mute circuit includes a first mute control terminal and a second mute control terminal. When there is a signal input at the first audio input terminal and no signal input at the second audio input terminal, the second mute control terminal outputs a low level, and the mute circuit controls the second audio differential output terminal to be pulled low to ground. When there is a signal input at the second audio input terminal and no signal input at the first audio input terminal, the first mute control terminal outputs a low level, and the mute circuit controls the first audio differential output terminal to be pulled low to ground. This invention controls the amplification or mute of the audio input signal by controlling the conduction or cutoff of a transistor through the high or low level of the mute signal output.

The utility model discloses a high-efficiency low-cost high-voltage ignition detection circuit, which belongs to the technical field of high-voltage power supply electronics and comprises a high-voltage current detection resistor, a piezoresistor, a filter capacitor, a blocking capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first triode and a second triode. By means of the mode, faults such as electric field ignition and arcing can be found rapidly, meanwhile, the method is suitable for ignition detection of power supplies with different power sizes, positive and negative high-voltage power supplies can conduct effective ignition detection, and the anti-interference capacity is high.

The application discloses a novel elevator light curtain, comprising a full-plastic shell and a circuit board arranged in the shell. The circuit board adopts a cascade multi-path switching module to select multiple photoelectric units, and a grounding filter network is arranged at the output end of each photoelectric unit to perform source filtering; an active filter buffer unit with a PNP triode as a core is introduced into a signal path, and a signal processing module containing a four-stage operational amplifier and a gradient RC filter network is adopted to perform step-by-step amplification and conditioning. The application actively and repeatedly suppresses internal and external electromagnetic interference from the source to the terminal under the premise of not relying on metal shielding through systematic hardware circuit design, simultaneously simplifies the structure, reduces the cost, and completely avoids the short circuit and failure risk caused by the shell grounding, and has higher reliability, environmental adaptability and economy.

The invention belongs to the field of vehicle-mounted electronic product power supply, and particularly discloses a stabilized power supply output system and an output method thereof.The system comprises a voltage reference chip, a first triode, a second triode, a power MOS tube, a first resistor, a second resistor, a third resistor and a fourth resistor; the third resistor and the fourth resistor are connected in series between the power output end and the ground, the voltage dividing point is connected with the base electrode of the second triode, the emitter electrode is grounded through the first resistor, and the collector electrode is connected with the source electrode of the power MOS tube through the fifth resistor and used for adjusting the voltage stabilizing output voltage limit value according to the normal working voltage limit value of a back-stage load. When the voltage of the input end is smaller than the set voltage-stabilizing output voltage limit value, the output voltage is kept consistent with the input voltage, and when the voltage of the input end is larger than the set voltage-stabilizing output voltage limit value, the output voltage is kept at the set voltage-stabilizing output voltage limit value. The circuit can meet the requirement of a large-power load, and can still work normally when the power supply voltage changes.

The utility model relates to low voltage difference linear voltage stabilizing circuit field, the utility model discloses a low -cost low voltage difference linear voltage stabilizing protection circuit, include: VCC input, VCC output, field effect transistor Q1, triode Q7, diode D2, voltage stabilizing diode D3, electric capacity C2, resistance R3, R4, R5, R6, VCC input and VCC output are respectively connected with the source electrode and the drain electrode of field effect transistor Q1, and R3 is connected between the grid of field effect transistor Q1 and the collector of triode Q7, and the positive pole and the negative pole of D3 are connected with ground and the base of triode Q7 respectively, and R5 is connected between the emitter of triode Q7 and VCC output, and R6 is connected between the emitter of triode Q7 and ground, and the negative pole of diode D2 is connected with the base of triode Q7, and R4 is connected between the drain of field effect transistor Q1 and the positive pole of diode D2, and one end of electric capacity C2 is connected between resistance R6 and ground, and the other end of electric capacity C2 is connected with VCC output. The utility model has the advantages of low cost and strong anti -interference ability.

The application provides a band gap reference voltage source circuit, which comprises a starting circuit, a core circuit and a current compensation circuit. The core circuit comprises a first NMOS transistor, first and second transistors, a first operational amplifier, first to third resistors and a compensation resistor. The drain of the first NMOS transistor is connected to a power supply, the source is connected to the first end of the first resistor, the base of the first transistor and the collector of the second transistor, and the gate is connected to the output end of the first operational amplifier. The second end of the first resistor is connected to the collector of the first transistor and the base of the second transistor, and the first end of the first resistor serves as the output end of the core circuit. The emitter of the first transistor is connected to the first end of the second resistor and the same input end of the first operational amplifier. The emitter of the second transistor is connected to the first end of the third resistor and the opposite input end of the first operational amplifier. The second end of the second resistor and the second end of the third resistor are respectively connected to the first end of the compensation resistor and the output end of the current compensation circuit, and the second end of the compensation resistor is grounded.

The utility model discloses a residual electricity rapid discharge circuit suitable for high voltage input, which belongs to the technical field of power electronics and comprises a voltage stabilizing diode, a first triode and a second triode, the voltage stabilizing diode, a first resistor and a second resistor are sequentially connected in series to form a first-stage voltage division circuit, and the first-stage voltage division circuit is used for controlling the second triode. The sixth resistor, the third resistor, the fourth resistor and the fifth resistor are sequentially connected in series to form a second-stage voltage division circuit, the second-stage voltage division circuit is used for controlling the first triode, and the two ends of the first-stage voltage division circuit and the two ends of the second-stage voltage division circuit are connected between the power source positive electrode and the power source negative electrode respectively. Compared with the prior art, the residual electricity rapid discharge circuit serves as a part of a direct-current high-voltage power supply, when the input end of the direct-current power supply is powered off, the residual electricity rapid discharge circuit serves as a discharge loop to achieve input voltage discharge, the time needed by input voltage discharge can be effectively shortened, and the working reliability is improved.

The utility model provides a software adjustable voltage reference circuit which comprises a micro-control unit which comprises a PWM (Pulse Width Modulation) signal output interface and an ADC (Analog to Digital Converter) sampling interface; the PWM signal output interface is connected with one input end of the voltage comparator U1; one input end of the voltage comparator U1 receives PWM signals output by the micro-control unit, the other input end of the voltage comparator U1 receives + VrefA reference voltage, the output end of the voltage comparator U1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected with a base electrode of the triode Q1 and one end of the resistor R4. The triode Q1 works in a linear interval, and a collector electrode of the triode Q1 is connected with a voltage dividing network composed of a resistor R5, a resistor R6 and a resistor R7 and used for generating + VrefA reference voltage and + VrefB reference voltage. And the feedback loop feeds the + VrefA reference voltage back to an ADC sampling interface of the micro-control unit to form closed-loop control. Software adjustable voltage reference can be realized.

The application discloses a kind of single-phase short-circuit fast detection protection circuit based on spectral characteristics, including AC section and DC section;In AC section, L line is connected in series with Hall current sensor, the output end of Hall current sensor is respectively connected with one end of voltage-dependent resistor and electrical equipment, voltage-dependent resistor is connected with the port III of rectifier element after being connected with electrical equipment in parallel, the port I of rectifier element is connected with N line;In DC section, the collector of the port II of rectifier element is respectively connected with triode NPN, one end of diode D1 and one end of capacitor C1, the emitter of triode NPN is respectively connected with the other end of diode D1, one end of diode D2 and the port IV of rectifier element, the other end of capacitor C1 is connected with the other end of diode D2, the base of triode NPN is connected with CON port through resistance R1.This application samples current by Hall current sensor, judges short-circuit fault using spectral analysis, and cuts off power supply by controlling triode NPN to shut down quickly through CON port, to realize fast short-circuit protection.

The utility model discloses an AC charging pile CP signal generating circuit, comprising a level conversion module and a push-pull output module, the level conversion module is used for converting a PWM signal output by an IO port of an MCU into a + / -12V CP signal, and the push-pull output module is connected to the level conversion module and is used for driving high and low level switching of the CP signal. The level conversion module comprises a resistor R1, the left end of the resistor R1 is connected with PWM signals output by an IO port of the MCU, the right end of the resistor R1 is connected with base electrodes of triodes Q2 and Q3, emitting electrodes of the triodes Q2 and Q3 are connected and connected with the lower end of a resistor R2 and the upper end of a resistor R3, the lower end of the resistor R2 is connected with the upper end of the resistor R3, the upper end of the resistor R2 is connected with a + 3.3 V power source, the lower end of the resistor R3 is grounded, and the lower end of the resistor R3 is grounded. The circuit provided by the utility model is simple, and the cost is lower.

The utility model discloses a kind of driver 24V fan short-circuit protection circuit, and the circuit includes: sampling resistance Rm, for sampling voltage value according to fan current;First switch tube Q1, its gate is controlled to photoelectric coupling secondary side output, control fan negative pole interface FAN-COM and +24V ground EP2 conduction, supply fan power supply;NPN and PNP double triode structure, for when fan current is too large or short-circuit, NPN and PNP double triode structure conduction, low level is output to the gate of first switch tube Q1, turn off the passage of fan negative pole interface FAN-COM and +24V ground EP2, realize fan short-circuit protection.The utility model can actively cut off fan loop when driver external fan fails, protect the power supply circuit device of fan from being damaged.

The stepless speed regulation controller comprises a rectifier circuit for taking power from commercial power and rectifying AC voltage of the commercial power into a 100 Hz DC pulsating signal; a zero point extraction circuit for collecting the 100 Hz DC pulsating signal and converting the 100 Hz DC pulsating signal into a zero-crossing pulse signal through resistance R17, R18 and R19 to the b electrode of the triode Q5, and through resistance R13 to the c electrode of the triode Q5; a controller connected with the zero point extraction circuit for collecting the zero-crossing pulse signal, the controller transmitting the zero-crossing pulse signal to a signal modulation circuit, the signal modulation circuit outputting an H bridge control signal; and an H bridge control circuit connected with the signal modulation circuit, the H bridge control circuit converting the H bridge control signal into a driving signal and outputting the driving signal to a motor. The stepless speed regulation controller is used for improving the reliability of the stepless speed regulation controller.

The invention aims to provide the communication line enhanced driving circuit, the circuit is simple, the cost is low, strong and constant driving current is provided, signal attenuation in long-distance communication can be effectively compensated, flexible switching of peripherals is supported, and the communication line driving capability is improved. The circuit comprises a dual-channel PNP-type triode, the dual-channel PNP-type triode comprises a first triode and a second triode, an emitter of the first triode and an emitter of the second triode are jointly connected to a VCC, a base of the first triode is connected with a collector of the first triode and is grounded through a resistor, and a base of the second triode is connected with a collector of the second triode. The base electrode of the second triode is connected with the base electrode of the first triode, and the collector electrode of the second triode serves as output to be connected with a load. The invention is applied to the technical field of communication systems.