984 results about "Audion" patented technology

The invention discloses a power MOS pipe grid drive circuit and method for grid floating and level switching. The drive circuit of the invention includes an upper pipe drive circuit and a lower pipe drive circuit, and is characterized in that the upper pipe drive circuit includes a first resistance, a second resistance, a third resistance and a fourth resistance, a bootstrap capacitance, a second capacitance, a first diode and a second diode, a first PNP type audion and a second PNP type audion, as well as a first NPN type audion; the lower pipe drive circuit includes a fifth resistance, a sixth resistance, a seventh resistance, an eighth resistance and a ninth resistance, a third capacitance and a fourth capacitance, a third diode, a third PNP type audion and a fourth PNP type audion as well as a second NPN type audion. The method can realize to convert grid drive level of upper and lower power MOS pipes, drive lower pipe grid and drive upper pipe grid floating. The invention does not adopt any drive chip, only consists of common discrete elements like resistance, capacitance and audion, etc, and has the advantages of low cost, high reliability and stability, as well as high drive efficiency.

An input voltage sampling compensating circuit comprises a first resistor for electro-static discharge (ESD) resistor voltage drop compensating, a zero potential temperature compensating audion, an operational amplifier, a second resistor for biasing or current limiting, a clamping audion, a feed-forward current image current mirror and a sampling trigger port. An emitter electrode of the compensating audion is grounded, a base electrode and a collector electrode are connected and then connected with one end of the first resistor; the other end of the first resistor is connected with a working power supply and the in-phase input end of the operational amplifier respectively, the output end of the operational amplifier is connected with a base electrode of the clamping audion through the second resistor, the base electrode is connected with the output end of the sampling trigger port, an emitter electrode of the clamping audion is used for being connected with the external ESD resistor, and a collector electrode is connected with the input end of the feed-forward current image current mirror; the power end of the feed-forward current image current mirror is connected with the working power supply, and the compensating current output end of the feed-forward current image current mirror is connected with the other end of the first resistor. The circuit is capable of compensating for the voltage drop on the ESD resistor, provided with a temperature self-compensating function and free of influences from the ESD resistor and the temperature.

The invention discloses an IOT-based industrial control system. The IOT-based industrial control system comprises a signal receiving circuit, a signal calibration circuit and a voltage-stabilizing output circuit; the signal receiving circuit receives signals of the input end of a signal transmission channel for a control terminal in the IOT-based industrial control system; the signal calibration circuit is divided into two channels for receiving output signals of the signal receiving circuit; one channel detects abnormal high-level signals by using a composite circuit composed of an audion Q1and an audion Q2; the other channel performs same-phase amplification by using an operational amplifier AR1; after same-phase amplification is carried out by the operational amplifier AR1, signals arerespectively amplified through an operational amplifier AR2 and attenuated through a variable resistor RW1; finally, after performing same-phase amplification by using an operational amplifier AR5, the voltage-stabilizing output circuit performs output after stabilizing voltage through a voltage-stabilizing circuit composed of an audion Q5 and a voltage-stabilizing tube D4; signals can be automatically calibrated; signal stability can be ensured; and thus, signal disturbance is prevented.

The invention relates to a power battery thermorunaway automatic alarm device and method used for monitoring and alarming thermorunaway of power battery single bodies. The automatic alarm device comprises multiple fuse elements and further comprises a control circuit and a warning indicator, and all the fuse elements are arranged on all the battery single bodies or battery packs formed by two or more battery single bodies and fuse when surface temperature of a certain battery single body or battery pack reaches a certain threshold value; all the fuse elements are sequentially connected in series to form a fuse element string, one end of the fuse element string is sequentially connected with the control circuit and the warning indicator, the other end of the fuse element string is grounded, and the control circuit uses the audion connection characteristics when the fuse elements fuse for controlling the warning indicator to act to automatically give an alarm. The automatic alarm device is simple in structure, low in cost and high in practicability, achieves real-time monitoring of thermorunaway of the battery single bodies connected in parallel or series in the power battery packs and improves safety and reliability of heat management on the power battery packs.

The invention provides an LED drive control circuit suitable to the technical field of lighting circuits, which comprises a singlechip, an audion, an MOS (Metal Oxide Semiconductor) tube, a power inductor and a constant current integrated chip, wherein a power input pin and a power output pin of the singlechip are respectively connected with the anode and the cathode of a power input end; the base electrode of the audion is connected with the singlechip, and the emitting electrode of the audion is connected with the cathode of the power input end; the grid electrode of the MOS tube is connected with the collector electrode of the audion through a divider resistor, and the source electrode of the MOS tube is connected to the anode of the power input end; one end of the power inductor is connected with the drain electrode of the MOS tube, the other end of the power inductor is connected with the anode of a diode, and the cathode of the diode is connected to the anode of an LED; a working enable pin of the constant current integrated chip is connected with the singlechip, a feedback pin of the constant current integrated chip is connected to the cathode of the LED for sampling current, and a power pin is connected to a node arranged between the power inductor and the anode of the diode. The LED drive control circuit is realized by adopting the constant current integrated chip with low cost and high efficiency, can ensure stable and reliable work of the LED, and has very simple structure.

The invention relates to a door lock control system based on NFC (Near Field Communication) and a method thereof, wherein the door lock control system based on NFC comprises a double-MOS (metal oxide semiconductor) transistor, a resistor R1 connected with the input end of the double-MOS transistor, an audion Q1 connected with the output end of the double-MOS transistor, a relay U1 connected with the audion Q1, an electromagnetic lock J1 connected with the output end of the relay U1, a diode D1 connected with the relay U1 in parallel, and a power supply E used for supplying power for the double-MOS transistor and the relay U1. The door lock control system based on NFC solves the technical problem that the traditional door lock brings trouble to users frequently. The safety information is stored into an NFC mobile phone terminal in advance by using the NFC technology, and then a door lock is controlled to be locked and unlocked through the door lock system formed by the NFC terminal and an intelligent lock system, thus the door lock control system not only is convenient for daily life, but also has higher safety.

The invention discloses an isolation transmission method of a switching power supply and a circuit thereof. Error signals sampled by a sampling circuit are sequentially output through an isolation circuit and a rectification filter circuit; the isolation circuit is composed of an isolation transformer, a driving triode and a pulse signal source, and the pulse The signal source outputs a pulse signal with a fixed frequency and pulse width, and the pulse signal is mixed with the error signal output by the sampling circuit through the driving triode in the primary winding of the isolation transformer, and the mixed signal is output from the secondary winding of the isolation transformer to the rectification filter circuit, It is rectified and filtered by a rectifying and filtering circuit to output a DC level signal whose amplitude is controlled by an error signal; the isolated transmission method and its circuit of the present invention have high transmission ratio for transmitting small signals, are less affected by temperature changes, and are resistant to radiation With the characteristics of strong capability, good stability and high derating, it is suitable for applications in high and harsh environments such as aerospace, military industry, and communications.

The invention discloses a backlight driving circuit. The backlight driving circuit comprises a voltage stabilizing circuit, a boost circuit and a control circuit. The voltage stabilizing circuit receives input voltage, filters the input voltage and outputs voltage stabilizing direct current. The boost circuit is connected with the voltage stabilizing circuit, receives the voltage stabilizing direct current, boosts and outputs the voltage stabilizing direct current to a light emitting diode (LED) light bar. The control circuit is connected with the boost circuit and is used for supplying a pulse width modulation (PWM) square wave and controlling the boost circuit to supply power for the LED light bar. The boost circuit comprises a metal oxide semiconductor (MOS) pipe or an audion. At least three resistors with near or same value of resistance are in parallel connection between a source electrode of the MOS pipe or a collector of the audion and the ground. Accordingly, the invention further provides a liquid crystal display adopting the backlight driving circuit. The backlight driving circuit and the liquid crystal display can improve the accuracy of the current output to the LED light bar.

An embodiment of the invention discloses an automatic air-conditioner switching method and an automatic air-conditioner switching device. Two air conditioners alternating working can be adopted to effectively prevent service life of an air conditioner from being affected after the air conditioner is used for a long time. The switching method includes judging whether a main engine is in an operating state or not when automatic switching function is started; if the main engine is not in the operating state, then judging whether an auxiliary engine is in the operating state or not; if the main engine is in the operating state, then judging whether preset time is arrived or not; if the preset time is arrived, then closing the main engine and opening the auxiliary engine to operate; if the auxiliary engine is in the operating state, then judging whether preset time is arrived or not; and if the preset time is arrived, then closing the auxiliary engine and opening the main engine to operate. 485 chips are adopted as communication tools, so that the auxiliary engine operation can be preset to ensure that working frequency of the auxiliary engine is the same with the main engine, and problems that power rate of the auxiliary engine is limited in automatic controlling and switching methods of audion amplifying circuits in the prior art are solved.

The invention provides a picosecond single recurrent pulse transmitter. Picosecond single recurrent pulse signals are generated according to the switching characteristics of a radio frequency audion, the driving capacity of a broadband linear power amplifying audion, the phase step characteristics of a phase step recovery diode, the capacitance variable characteristics of a variable capacitance diode, the total reflection characteristics of a micro-strip short-circuit wire and the like, the output pulse positive and negative polarity symmetry is good, the peak-to-peak value amplitude is large, the pulse bottom width and trailing are small, and the picosecond single recurrent pulse transmitter is suitable for the high-resolution pulse type ultra wide band radar system application.

The invention discloses an amplifier circuit of a three-level amplifying structure. The amplifier circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first diode, a first audion, a second audion and a third audion. According to the amplifier circuit of the three-level amplifying structure, triple amplifying structure bodies are designed, the conversion rate of an amplifier is significantly improved, the design is ingenious, and the amplifier circuit is worthy of popularization.

The invention provides a temperature compensation current reference circuit applied to an integrated circuit, wherein a sixth transistor, a seventh transistor and an eighth transistor are mutually matched current mirrors, and the proportion of the current mirrors is 1:1:1; a ninth transistor and a tenth transistor are mutually matched current mirrors, the proportion of the current mirrors is 1:1; a first transistor and a second transistor are mutually matched NPN triodes; a third transistor and a fourth transistor are mutually matched; and a first resistor utilizes a high-value polycrystal resistor, and a second resistor utilizes a P-type ion injection resistor. Positive temperature coefficient current and negative temperature coefficient current are added to obtain temperature compensation reference current, and then the temperature compensation reference current is provided for other circuits by utilizing the current mirrors. The temperature compensation current reference circuit applied to the integrated circuit, disclosed by the invention, has the advantages that the reference current changes very tiny in a certain temperature change range (minus 40-130 DEG C).

The invention discloses a dimmable LED constant-current output driving system based on a power amplifying circuit. The dimmable LED constant-current output driving system is characterized by mainly comprising a processing chip U, an audion VT2, a protective circuit, a low-pass filter circuit, a linear dimming circuit, a resistor R1, a capacitor C4 and a gate drive circuit, wherein the low-pass filter circuit is connected between the protective circuit and the processing chip U in series; the linear dimming circuit is connected between the protective circuit and the base of the audion VT2 in series; the resistor R1 is connected between the collector of the audion VT2 and the LD pin of the processing chip U in series; the anode of the capacitor C4 is connected with the emitter of the audion VT2; the cathode of the capacitor C4 is connected with the RI pin of the processing chip U; and the gate drive circuit is respectively connected with the GATE pin of the processing chip U and the low-pass filter circuit. According to the dimmable LED constant-current output driving system disclosed by the invention, the brightness of an LED can be adjusted according to requirements; compared with the traditional LED driving system, the dimmable LED constant-current output driving system disclosed by the invention has better linearity when the brightness of the LED is adjusted; therefore, the LED is steadier to work; and the flicker phenomenon can be avoided.

The invention relates to a single chip microcomputer controlled power grid detection and reset circuit, which is characterized by comprising a micro-control circuit, a main control circuit and an audion circuit, wherein a PA1 detection port of the micro-control circuit is connected with a 12V power supply through the main control circuit to form a power grid power on/power failure detection structure, a PA4 of the micro-control circuit is used as an output port and is externally connected with an external interruption port of a main control chip of a main control chip circuit through electrical resistance, the micro-control circuit controls an audion to switch on/off, and an output end of the audion circuit forms the reset circuit for the main control circuit; a single chip microcomputer chip PA4 port of the micro-control circuit respectively starts and stops outputting a 200HZ square wave signal according to the power on and power failure of the PA1 port, so that the main control circuit can enter a normal or power-save working mode. The single chip microcomputer controlled power grid detection and reset circuit has the beneficial effects that the circuit is simple in structure, the used components are less, and the economic benefit is increased.

An overvoltage and undervoltage protective circuit based on a three-end adjustable shunt reference source comprises an undervoltage protective circuit, an overvoltage protective circuit and an output control circuit, wherein the undervoltage protective circuit, the overvoltage protective circuit and the output control circuit are connected in a power circuit, the undervoltage protective circuit is composed of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, an audion Q1, a voltage-regulator diode DZ1 and a TLV431 chip U1, the overvoltage protective circuit is composed of a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor 10, a capacitor C3, a capacitor C4, an audion Q2, a voltage-regulator diode DZ2, a voltage-regulator diode DZ3 and a TLV431 chip U2, and the output control circuit is composed of a resistor R11, a capacitor C5, an MOS transistor Q3 and a diode D1. According to the overvoltage and undervoltage protective circuit, the TLV431 is utilized as the standard, overvoltage and undervoltage protection can be conducted on a power supply, power consumption is low, accuracy is high and reaction speed is high.

The invention discloses a bias circuit for a radio-frequency power amplifier. The bias circuit comprises a differential amplifier composed of two audions; the differential amplifier is that the bases of the two audions are used as differential input ends and the collector of one audion is used as a single output end; the bias circuit further comprises an active driving tube; the base of the active driving tube receives voltage of the single output end of the differential amplifier as input; the emitter of the active driving tube provides base bias current for a power tube; two voltage dividing branches respectively provide base voltage for the two audions forming the differential amplifier; and furthermore, when the temperature is changed, the change directions of the base voltage of the two audions forming the differential amplifier are opposite. By means of the bias circuit disclosed by the invention, the sensitivity to temperature change can be obviously reduced; the linearity of the radio-frequency power amplifier is improved; and thus, the radio-frequency power amplifier can keep a normal working state in a relatively severe working condition and environment.

The invention discloses a gain self-adaption error amplifier comprising a level shift circuit, an operation transconductance amplification circuit and a comparison circuit. An input level of the operation transconductance amplification circuit meets a normal operation requirement by the level shift circuit; the operation transconductance amplification circuit uses a bipolar audion as a differential pair transistor, and utilizes an MOS tube common-source structure current mirror to provide current bias for the differential pair transistor to reduce power consumption, so as to ensure providing of greater gain; the comparison circuit utilizes a feedback structure to control a circuit output slew rate, so as to output a control signal of the operation transconductance amplification circuit; an amplitude limiting circuit limits the output voltage of the operation transconductance amplification circuit. According to the amplifier provided by the invention, power output ripples in a load current stabilization application are reduced, and thus power consumption of a system is reduced, and meanwhile influence on a load transient behavior is small.

The invention relates to a full-bridge phase shift induction heating device, which comprises a main circuit for induction heating, a drive control circuit, a current-limiting protection and power regulation control circuit, an overcurrent protection circuit and a frequency tracking circuit, wherein the main circuit comprises four audions, four diodes, a power supply, an inductance, an electric resistance, a current transformer and a capacitance; the drive control circuit is used for outputting four PWM (Pulse-Width Modulation) pulse signals to drive the main circuit, and the four PWM pulse signals are respectively electrically connected to base electrodes of the four audions; the current-limiting protection and power regulation control circuit is electrically connected to the drive control circuit and is used for automatically regulating sizes of phase shift angles among the four audions so as to realize regulation of output power; the overcurrent protection circuit is electrically connected to the drive control circuit and is used for protecting heating power supply overcurrent or short trouble power supply of the full-bridge phase shift induction heating device; and the frequency tracking circuit is electrically connected to the drive control circuit and is used for enabling the frequency of the four PWM pulse signals sent by the drive control circuit and load current frequency of a resonant circuit in the frequency tracking circuit to be synchronized.