260 results about "Audion" patented technology

The invention discloses a power management circuit based on programmable output reference voltage and a control method thereof. The circuit comprises a first power supply voltage input end (VCC) used for inputting a power supply; the NMOS tube (Q1) is used for controlling the output voltage (VOUT) according to the change of the reference voltage input end (INREF); the current-limiting resistor (R1) is connected in series with the source electrode of the NMOS tube (Q1) and is used for detecting output current; the base electrode of the triode (Q2) is connected to one end of the current-limiting resistor (R1), and when it is detected that the current exceeds a preset value, the triode (Q2) is conducted to reduce the reference voltage; the optical coupler (U1) is connected with an external control unit, the external control unit generates an over-current alarm signal by detecting the voltage on the current-limiting resistor, and the output of the power supply is turned off by controlling the reference voltage input end (INREF) to 0V, so that the circuit is protected.

The utility model provides a level-to-pulse activation circuit and a charger, the circuit comprises a time delay circuit, a driving circuit, a switch control circuit and an output circuit, the time delay circuit comprises a first resistor, a second resistor, a first field effect transistor and a first capacitor, and the driving circuit comprises a seventh resistor and a triode. According to the level-to-pulse activation circuit, when a charger is connected, the triode is turned on, at the moment, current sequentially passes through the fourth resistor and the triode to be grounded, the second field-effect tube is turned on, high level is output at the voltage output end, after the first capacitor is charged for a period of time, the first field-effect tube is turned on and grounded, and the triode and the second field-effect tube are sequentially turned off. Therefore, the voltage output end outputs low level, one pulse period is completed, the rising edge of the pulse signal is fast, and the voltage and the pulse width are appropriate. When the battery is powered on, the battery takes power from the charging anode, and when the battery is not charged, the charging anode has no voltage because the first field effect transistor and the triode are turned off, so that power consumption is avoided.

The invention discloses a high-voltage bidirectional silicon controlled rectifier electrostatic protection device and a manufacturing method. The high-voltage bidirectional silicon controlled rectifier electrostatic protection device comprises a P-type substrate, a P-type well and a high-voltage N well, the emitter P + injection of a parasitic PNP triode and the emitter N + injection of a parasitic NPN triode in the P-type well are arranged alternately, so that the length of a transverse discharge path of the silicon controlled rectifier is reduced to the greatest extent, the square resistance of a PNPN positive feedback conduction path is greatly reduced, and the key problem that a symmetrical bidirectional silicon controlled rectifier structure cannot be effectively opened in a high-voltage window of more than 70V is solved; in addition, the layout can provide an additional parasitic NPN triode path for a silicon controlled rectifier path, the effective area of an emitter of the parasitic NPN triode and the proportion of the emitter in a silicon controlled rectifier loop are increased, and the current discharge capacity of the device is further improved. Therefore, reference can be provided for the structural design of the high-voltage symmetrical bidirectional silicon controlled rectifier electrostatic protection device, and the silicon controlled rectifier can be effectively applied to ESD protection of a high-voltage bidirectional port.

The utility model discloses a novel IGBT (Insulated Gate Bipolar Translator) driving circuit, which comprises a driving signal control module, a grid voltage monitoring and logic processing module and a triode driving and resistance switching module, the grid voltage monitoring and logic processing module comprises a grid voltage, a first signal comparator and a second signal comparator which are connected with the grid voltage, a turn-on threshold voltage connected with the first signal comparator, a Miller platform voltage connected with the second signal comparator, and a gate voltage monitoring and logic processing module connected with the turn-on threshold voltage and the Miller platform voltage. The logic gate circuit is connected with the first signal comparator and the second signal comparator; the triode driving and resistor switching module comprises a turn-on triode group, a turn-on resistor assembly connected with the turn-on triode group, a turn-off triode group, and a turn-off resistor assembly connected with the turn-off triode group. The IGBT is quickly turned on and reliably turned off, and the dead time is reduced.

The invention discloses a low-self-heating constant-temperature-difference control circuit and method for compensating process errors of a thermal flowmeter. The low-self-heating constant-temperature-difference control circuit comprises a heating resistor, an environment temperature resistor, a control resistor, a starting resistor, a first potentiometer, a second potentiometer, first to sixth resistors, a triode, a first operational amplifier, a second operational amplifier, a third operational amplifier and a power source. The third operational amplifier controls a Wheatstone bridge composed of the first resistor, the second resistor, the heating resistor and the environment temperature resistor as main bodies to be in a balanced state through negative feedback regulation; the third resistor, the fourth resistor, the fifth resistor and the sixth resistor reduce the heating power of the environment temperature resistor through voltage division, resistance values of the first potentiometer and the second potentiometer are adjustable, and errors of resistance values and temperature coefficients generated in the machining process of the heating resistor and the environment temperature resistor can be compensated. According to the invention, the overheating temperature of the heating resistor can be more accurately controlled to be constant, so that the measurement precision is improved.

The invention discloses a charge pump switching tube dynamic substrate bias current leakage prevention method and device, and relates to the technical field of charge pumps, the charge pump switching tube dynamic substrate bias current leakage prevention device comprises an MOS switching tube SW1, an MOS switching tube SW2, an MOS switching tube SW3, an MOS switching tube SW4, an energy storage capacitor Cs1 and a two-time positive voltage charge pump circuit of a non-overlapping clock signal CLKP / CLKN, and the source end or the drain end of the charge pump circuit is periodically switched on or off according to the clock signal. By providing a dynamic bias technology of the substrate of the mos switch, the parasitic pnp / npn triode in the mos switch is ensured not to be positively conducted no matter whether the charge pump is provided with a heavy load or a light load, so that the internal node of the charge pump is prevented from leaking large current to the psub / dnw, the driving capability of the charge pump is enhanced, and the reliability of the charge pump is improved. Moreover, the current consumption of the charge pump is reduced, and the efficiency of the charge pump is improved.

The present invention discloses a high-voltage op-amp-free voltage-stabilizing startup circuit and a voltage-stabilizing startup method thereof. The circuit includes a voltage-stabilizing circuit and a startup circuit. The startup circuit generates a bias current Ibias2. In the voltage-stabilizing circuit, a transistor Q7 and a PMOS transistor PDM2 form a first common-emitter amplifier, an NMOS transistor NDM2 and a PMOS transistor PDM3 form a first common-source amplifier, and a PMOS transistor PDM4, a transistor Q6, a resistor R4, and a transistor Q5 form a second common-source amplifier. The present invention does not require the additional design of a pre-voltage-stabilizing circuit and a high-voltage operational amplifier, thereby saving chip area. Furthermore, after the voltage-stabilizing startup circuit is started, the startup circuit does not need to be shut down.

The invention discloses a temperature measurement method, system, medium and equipment integrating a terminal and an electric energy meter, and the method comprises the steps: obtaining a basic temperature value through measuring the voltage difference of a PN junction of a voltage difference triode based on a dynamic matching method; a pre-stored segmentation error compensation model is called to correct the basic temperature value, and a final temperature value is output; through collaborative design of a dynamic matching method and a segmented error compensation model, the problem of full-temperature-range measurement error caused by dynamic change of saturation current IS in operation is solved. Compared with a mode of correcting the saturation current IS initial value only through factory single-point fine adjustment in the prior art, the embodiment of the invention can effectively cope with the dynamic fluctuation of the saturation current IS parameter in the operation process, thereby realizing more stable temperature measurement.

The invention discloses a firmware updating method, circuit and equipment of electronic equipment and a storage medium, and relates to the technical field of electronic circuits. The method comprises the steps that when connection is established through a connecting line base and a universal connecting line, power is supplied to a capacitor module through a power module, and current is transmitted to a first triode through the capacitor module, so that the first triode is changed into a conducting state from a cut-off state; if the system switch of the power supply module is closed before the first triode is changed from the on state to the off state, current is transmitted to the second triode through the power supply module, so that the second triode is changed from the off state to the on state; voltage is transmitted to the main control chip through the second triode, so that the current voltage of a connecting pin of the main control chip and the second triode is high level, and firmware updating is triggered. According to the technical scheme, the firmware updating is triggered by using the universal connecting line, the production cost is reduced, and the workload of a user for storing and managing the special connecting line is reduced.

This application provides an ESD protection structure for nanoscale process technology, comprising an RC detection structure and a protective NPN transistor. A trigger source based on the P+ diffusion region in the protective NPN transistor is connected to the RC detection structure. Once static electricity is generated, the detection current generated by the RC detection circuit enters the protective NPN transistor through the trigger source, generating a current flowing from the trigger source to the P- epitaxial layer. When the voltage generated by the P- epitaxial resistor and this current reaches the NPN transistor's turn-on voltage, the protective NPN transistor conducts to discharge the ESD current. The protective NPN transistor in this application is triggered to conduct through the transistor's substrate. Because the protective NPN transistor lacks the lightly doped drain structure (LDD) produced by standard process technology, and the ESD current is discharged through the parasitic NPN transistor substrate rather than concentrated on the diffusion region channel surface, it can provide relatively high ESD protection capability with a relatively small layout area, making it more suitable for high-density chips and nanoscale process technology.

The invention provides a bypass capacitor fault detection circuit and detection method. The detection circuit comprises a triode V1, a triode V2 and a universal meter, the triode V1 and the triode V2 are connected in series to form a composite triode, and one end of a capacitor to be detected is connected with a base electrode of the triode V1. During detection, a red meter pen and a black meter pen of the multimeter are respectively connected with an emitting electrode and a collecting electrode of the composite triode, then the red meter pen and the black meter pen are exchanged and are respectively connected with the collecting electrode and the emitting electrode, and the deflection condition of pointers in measurement on the two sides is observed. And the electric leakage degree and the electric leakage resistance of the capacitor can be accurately judged. The circuit is simple in structure, high in detection accuracy, economical and practical.

The present invention relates to a CAN bus intrusion prevention circuit and method. The circuit includes a microprocessor (MCU), NPN transistors Q1, Q2, and Q3, coupling capacitors C1 and C2, current-limiting resistors R3, R4, R5, R6, R7, R8, R9, and R10, a 3.5V voltage-stabilizing diode D2, a 2.5V voltage-stabilizing diode D3, and a 1.5V voltage-stabilizing diode D4. The microprocessor MCU has a board-level communication interface O1 for receiving instructions to activate an intrusion prevention function, and a PWM pin for outputting a PWM signal. The PWM signal has a frequency that is ten times or more greater than the baud rate of the connected CAN bus, a high level of not less than 3.3V, and a duty cycle of not less than 0.9. Based on the characteristics of the CAN link layer protocol, the present invention can immediately initiate intrusion prevention upon detecting abnormal CAN bus data, thereby actively shielding illegal or hijacked attacking devices and protecting bus security.

The invention discloses a programmable current-limiting regulation output circuit and a control method, which are used in the field of electronic measurement circuits. The circuit comprises a power supply end, a reference voltage input end, a digital-to-analog converter, a sampling resistor, a comparator, a first triode, a second triode, an output control transistor and a voltage output end. The base electrode of the first triode is connected to the output end of the digital-to-analog converter, the emitter electrode is connected to the power end, the collector electrode is connected to the first input end of the comparator, the second input end of the comparator is connected to the voltage output end through the sampling resistor, and the output end of the comparator is connected to the base electrode of the second triode. The collector of the second triode is connected to the reference voltage input end, the emitter is connected to the voltage output end, the gate of the output control transistor is connected to the reference voltage input end, the drain is connected to the power supply end, and the source is connected to the voltage output end.

The present invention discloses an AC / DC adaptive electric energy metering system and method, including a sampling module, an AC / DC detection module, an AD conversion module, a metering unit, and a management unit. The sampling module includes a resistor R1, a resistor R2, and a manganese-copper shunt. The manganese-copper shunt, the AD conversion module, and the metering unit are connected in sequence. The management unit is connected to the AC / DC detection module and the metering unit respectively. The AC / DC detection module includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C1, a capacitor C2, a diode D1, and a transistor Q. The metering unit measures the input current under the control of the management unit. The present invention can automatically switch and calculate AC / DC electricity, and adopts different calculation methods for DC electricity in different situations, so that the DC electric energy calculation accuracy is high.

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 invention relates to the technical field of electronic science, in particular to an electronic fuse circuit and a chip thereof, and a current-limiting protection module in the circuit can reduce output current through a current-limiting resistor and obtain first output voltage generated when the output current passes through the current-limiting resistor. And when the first output voltage is greater than the first conduction voltage of the current-limiting triode, the current-limiting triode is conducted to obtain a current-limiting protection current, so that the working state of the transistor is adjusted to a linear working state through the current-limiting triode and the current-limiting protection current to control the output current of the circuit not to exceed a current-limiting threshold value. Thus, by dynamically adjusting the protection current threshold and combining the conduction characteristic of the triode and the linear working state of the transistor, precise control over the output current and precise regulation and control over the protection current threshold are achieved, the safety and reliability of the circuit are remarkably improved, and the actual requirement of a modern vehicle-mounted electronic system for small current application is met.

The invention discloses a transimpedance amplifier insensitive to high light intensity, which comprises an input signal amplification structure and a double-end output structure which are connected with each other, the double-end output structure is also connected with a current bias structure, and the current bias structure is used for providing stable bias current irrelevant to a triode amplification coefficient for the input signal amplification structure. And under the condition that no signal is input, the output reference voltage is equal to the output voltage, and the input signal amplification structure is used for providing a corresponding amplification factor for a wide-range input signal. According to the transimpedance amplifier insensitive to high light intensity, under the condition that the light intensity is large, the triodes enter a saturation region, the output voltage is divided by the resistors and clamped at the lowest output voltage, and the output voltage is prevented from being lower than the common-mode input range of a post-amplifier; when the input optical signal disappears, that is, the output signal is strained to be a high level, the level jump speed is improved through the rapid discharge path.

The invention discloses a reset circuit utilizing KL15 ignition signals for hard reset, which comprises a first resistor, a second resistor, a third resistor, a first capacitor and a triode, the base electrode of the triode is electrically connected with the first resistor through the second resistor and the first capacitor, one end of the second resistor is connected with the first resistor, and the other end of the second resistor is connected with the third resistor. The other end of the second resistor is electrically connected with the first capacitor, an emitting electrode of the triode is grounded, and a collecting electrode of the triode is externally connected with a direct-current voltage power source through the third resistor, a traditional external watchdog reset chip is replaced through the design of discrete components, and the circuit has the advantages of being wide in applicability, low in hardware cost, easy to achieve and high in reliability. The design of the system has good expansibility, and can flexibly adapt to differentiated requirements of different customers while helping the customers reduce cost and improve efficiency.

The utility model relates to an over-temperature and over-voltage protection circuit which comprises a power supply circuit, a lighting circuit, an operational amplifier power supply circuit, a voltage detection circuit, a temperature detection circuit and an LED power supply circuit. The voltage detection circuit is composed of a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first operational amplifier, a first MOS tube, a second triode and a second voltage stabilizing diode. The temperature detection circuit is composed of a tenth resistor, an eleventh resistor, a twelfth resistor, a second operational amplifier and a thermistor. Whether the input voltage exceeds the normal working voltage or not is judged through the voltage detection circuit, whether the current temperature exceeds the rated temperature of a device or not is judged through the temperature detection circuit, whether the lamp needs to be turned on or turned off or not is judged through the two operational amplifiers, and then a signal is output to control the light-emitting diode to be turned on or turned off.

The invention belongs to the technical field of integrated circuits, and particularly relates to an ESD electrostatic protection structure suitable for a low-voltage circuit. The ESD electrostatic protection structure adopts a mode that an NPN triode with a floating layered base region structure is used for assisting in triggering an SCR to discharge forward ESD current and a PN junction diode to discharge negative ESD current; the NPN triode with the floating layered base region structure comprises an N + active region I, a P-type ESD injection region, a P well I and an N + active region II, the first N + active region and the second N + active region are a collector region and an emitter region of the NPN triode respectively, the base region is composed of a P-type ESD injection region and a first P well, the P-type ESD injection region is located below the first N + active region, and the base region is of a floating layered structure. The ESD protection structure is provided with a bidirectional rapid ESD current discharge path to the ground, so that the SCR trigger voltage is reduced.

The application relates to an actively detected power state detection system and method, which comprises at least two groups of symmetrically arranged triode modules, an optical coupling isolation module and a MOS tube driving module; the MOS tube driving module is connected with a signal input end through double channels and is used for receiving active monitoring electric signals; when the double channels of each MOS tube driving module simultaneously receive the same active monitoring electric signals, the MOS tube driving module converts the active monitoring electric signals into detection pulses and sends the detection pulses to the optical coupling isolation module to conduct short-time detection on the power state; the optical coupling isolation module is used for isolating the MOS tube driving module from the measured power supply and transmitting the detection pulses from the MOS tube driving module; only one group of optical coupling isolation modules can be turned on at the same time in the system; the triode module is connected with a signal output end through double channels and is used for acquiring and outputting the power state to be measured. Compared with the prior art, the application can actively control the power state detection and conduct self-detection.

The utility model discloses a button signal identification circuit based on triode control, which relates to the field of button signal identification, and is characterized in that each button is associated with a voltage dividing unit through a corresponding triode, and the triode controls the corresponding voltage dividing unit to work according to the state of the button, so that when the button is pressed down, the voltage dividing unit can be adjusted according to the state of the button. The corresponding voltage dividing unit can generate and output a voltage signal corresponding to the key; that is to say, the key does not directly participate in the voltage division loop, but indirectly influences the voltage output in the circuit by controlling the conduction state of the triode, so that the state identification of the key does not depend on the contact impedance between the golden finger and the conductive rubber any more, and the condition that the key cannot be damaged even under the condition that the fluctuation of the contact impedance is large is ensured. And the circuit can accurately identify the key state without generating false triggering.

The present application discloses an over-temperature protection circuit and method, which includes a reference current module, a temperature detection module, and a current comparison module; the output end of the reference current module is connected to the input end of the current comparison module; the output end of the temperature detection module is connected to the other input end of the current comparison module. The present application uses the current comparison module to compare the received positive temperature coefficient current and the reference current to obtain a comparison result, and adjusts the output voltage VOUT of the over-temperature protection circuit according to the comparison result. There is no need to perform temperature detection through the base-emitter voltage of the transistor. Therefore, the over-temperature protection circuit does not have the inherent disadvantages of temperature detection (that is, the detection accuracy will be affected by the manufacturing process deviation), thereby improving the detection accuracy of the over-temperature protection circuit.

The invention discloses a starting circuit of a wide-voltage-domain and high-precision analog temperature sensor. The starting circuit comprises a temperature sensor main body structure, a starting module and an external load. The main body structure of the temperature sensor is composed of triodes, generates a voltage in direct proportion to the temperature and provides the voltage to an external load. The starting module is composed of a capacitor, so that the circuit is separated from a zero degeneracy point state, and extra current is not consumed after the circuit is started; the two ends of the external load apply PTAT voltage to the temperature sensor, and the PTAT voltage is converted into PTAT current. The circuit is low in power consumption, current passes through the two ends of the capacitor only in the starting process, the current on the capacitor is zero after normal work, and normal starting work of the circuit can be guaranteed under lower working current.

The present invention discloses a dual-path complementary synchronous rectification driving circuit, which relates to the field of circuit technology, and includes: a main control chip; the main control chip has two input ports, namely, a fifth pin and a sixth pin, and two output ports, namely, a third pin and an eighth pin; the fifth pin is connected to a driving signal via a second voltage stabilizing diode, the driving signal is connected to the negative electrode of the second voltage stabilizing diode, and the positive electrode of the second voltage stabilizing diode is connected to the fifth pin; the sixth pin is connected to a power supply voltage via a first adjustable resistor, a first voltage stabilizing diode, and a triode in sequence. The present invention uses an external processing method to invert and delay the drive to realize the conversion of one-path drive into a dual-path complementary drive, and has the characteristics of low cost and simple structure, and is more suitable for application in the synchronous rectification technology.

The present invention discloses a low self-heating constant temperature difference control circuit and control method for compensating for process errors in a thermal flowmeter. The circuit comprises a heating resistor, an ambient temperature resistor, a control resistor, a starting resistor, a first potentiometer, a second potentiometer, first to sixth resistors, a transistor, a first operational amplifier, a second operational amplifier, a third operational amplifier, and a power supply. The third operational amplifier uses negative feedback to control a Wheatstone bridge circuit composed mainly of the first resistor, the second resistor, the heating resistor, and the ambient temperature resistor to maintain a balanced state. The third to sixth resistors reduce the heating power of the ambient temperature resistor through voltage division. The resistance values ​​of the first and second potentiometers are adjustable, thereby compensating for errors in the resistance and temperature coefficients of the heating and ambient temperature resistors that occur during processing. The present invention can more accurately control the overheat temperature of the heating resistor to be constant, thereby improving measurement accuracy.

The present invention relates to the technical field of circuit monitoring, and specifically discloses a monitoring system for a control circuit, comprising: an input protection unit, an energy storage unit, a bridge wire unit and a constant voltage switch circuit, wherein a current limiting resistor and a capacitor rectifier bridge form the input protection unit, a polar capacitor and a resistor form the energy storage unit, and a PNP, NPN transistor and a resistor form the bridge wire unit and the constant voltage switch unit. The voltage across the polar capacitor is monitored in real time by a monitoring unit until the starting voltage of the bridge wire unit and the constant voltage switch circuit is met, the temperature of the bridge wire FUSE is monitored based on the starting voltage, the proximity ratio of the bridge wire temperature to a fuse safety threshold is calculated, and a fuse safety or warning signal is obtained according to the comparison between the proximity ratio and the fuse threshold, and the fuse warning signal is used to predict and analyze the fuse time of the bridge wire FUSE, the fuse prediction time of the bridge wire is obtained and compared with the fuse safety time, and the safety state of the bridge wire FUSE is judged.

The embodiment of the invention provides a cleaning voltage control circuit, a high-voltage plate and electronic equipment. The cleaning voltage control circuit comprises a generation module, a detection module and a protection module, the generation module is used for generating cleaning voltage according to the control signal of the control module; the cleaning voltage is used for cleaning toner on the transfer printing body and / or the photoreceptor; the detection module is used for detecting whether the working time length of the generation module exceeds the set time length or not; and the protection module is used for protecting the generation module when the working duration exceeds the set duration. The detection module detects whether the working duration of the generation module exceeds the set duration, namely the duration of the cleaning voltage, and if the working duration exceeds the set duration, the generation module is protected through the protection module. The abnormal state of the cleaning voltage is recognized in time through the detection module, protection is carried out, and the problems of triode switch overstress and abnormal ink powder consumption caused by abnormal cleaning voltage are avoided.

The invention discloses a temperature compensation band-gap reference circuit, relates to the technical field of analog integrated circuits, and aims to solve the problem that a traditional band-gap reference circuit is large in temperature drift due to the fact that the traditional band-gap reference circuit is affected by a VBE nonlinear high-order term within a wide temperature range. The circuit comprises a bias circuit module, a starting circuit module, a temperature compensation circuit module and a band gap core circuit module. Wherein the bias circuit module provides temperature-insensitive bias current for the system through the current mirror network; the starting circuit module realizes power-on quick starting, normal working zero static power consumption and power-down quick reset by utilizing the synergistic effect of a capacitor and a switch; according to the band-gap core circuit module and the temperature compensation circuit module, nonlinear voltage characteristics are extracted through triode emitter voltage difference, reverse compensation current is introduced through a feedback loop, and a high-order temperature drift item in reference voltage is accurately offset. In addition, the circuit adopts a composite resistor structure in which polycrystalline silicon and diffusion resistors are connected in series, so that process deviation and resistance temperature drift are further inhibited.

The invention discloses an anti-islanding driving circuit suitable for a distributed photovoltaic grid-connected circuit breaker. The anti-islanding driving circuit comprises a DC-DC power supply circuit, a super-capacitor charging control circuit, a super-capacitor boost discharging circuit, a motor driving circuit, a motor charging linkage circuit and a motor current-limiting protection circuit. The DC-DC power supply circuit converts 12V input voltage into motor target voltage, the super capacitor charging control circuit adopts double NPN triodes and diodes to prevent reverse breakdown, and charging is stopped when the motor is started. The super capacitor boost discharge circuit supplies power to the motor when the main power supply is powered off. The motor driving circuit controls operation of a motor through logic level signals, a sampling resistor monitors input current, and the linkage circuit adopts AND gate logic peak shifting power utilization. And the current-limiting protection circuit realizes overcurrent protection through the current induction amplifier and the control triode. According to the invention, the photovoltaic grid-connected connection can be automatically disconnected, the islanding effect is prevented, and the reliability and the stability are high.