19results about How to "Implement overvoltage protection" patented technology

The invention discloses a switching power supply and an overvoltage protection method thereof, the switching power supply comprises a main power tube, a freewheeling tube, a center tap inductor and an overvoltage protection circuit, and the overvoltage protection circuit comprises an input sampling unit for sampling a voltage on a sampling point of the switching power supply to obtain an input sampling voltage representing an input voltage; and the overvoltage control unit is used for performing overvoltage protection on the switching power supply according to the duty ratio, the input sampling voltage and the reference voltage. The center tap inductor is connected with the main power tube and the follow current tube, the overvoltage protection threshold value is adjusted by adjusting the position of the center tap end in the center tap inductor, and the overvoltage protection threshold value is the output voltage when overvoltage protection is triggered. According to the overvoltage protection circuit, the center tap inductor is added in the switching power supply, and the position of the center tap end in the center tap inductor is randomly adjustable, so that an overvoltage protection threshold is continuously adjustable, the range of an overvoltage protection point is enlarged, the voltage protection range is widened, and the overvoltage protection capability is improved.

The invention discloses a battery charging method, a storage system, a server, a medium and a product, and relates to the technical field of servers. And when the current temperature of the charging module reaches the temperature control condition, the remaining time of the maximum temperature of over-temperature protection is determined according to the current temperature change rate so as to ensure that the over-temperature protection is not triggered, namely the power supply function is not closed. Due to the real-time change of the current temperature change rate, the remaining time is determined in real time, and the calculation accuracy and real-time performance of the remaining time are improved; the full charging corresponds to the first time required by the full charging state of the battery cell. The charging current of the charging module is adjusted based on the remaining time and the first time, the charging current is increased or reduced in the adjusting process, and dynamic adjustment is carried out based on the size relation of the two time parameters, so that over-temperature protection is not triggered before the battery is fully charged, namely, the charging current is possibly increased and the charging speed is increased when the over-temperature protection is not triggered.

A self-recovery alternating current input overvoltage protection circuit comprises a live wire, a zero wire, a resistance-capacitance step-down circuit, a rectification circuit, a filter circuit and an output control circuit, the left end of the live wire is a live wire input end, the right end of the live wire is a live wire output end, and the left side of the lower portion of the live wire is connected with the resistance-capacitance step-down circuit. The lower portion of the resistance-capacitance step-down circuit is connected with the rectification circuit, the lower portion of the rectification circuit is connected with the filter circuit, the lower portion of the filter circuit is connected with the zero line, the right side of the lower portion of the live wire is connected with the output control circuit, the lower portion of the output control circuit is connected with the zero line, the left end of the zero line is a zero line input end, and the right end of the zero line is a zero line output end. According to the circuit design of the utility model, current input is subjected to resistance-capacitance voltage reduction, rectification and filtering to supply power to the normally-closed relay, the voltage-regulator tube DZ1 controls the normally-closed relay, and the voltage-regulator tube DZ2 protects the coil of the normally-closed relay, so that the design is simple in structure and low in cost, and overvoltage protection of a line can be realized.

The invention provides an overvoltage protection circuit applied to a step-down DC-DC converter and the step-down DC-DC converter. The overvoltage protection circuit comprises a first voltage end used for providing feedback voltage, a second voltage end used for providing reference voltage, a comparator, an upper tube control drive circuit and a lower tube drive control circuit. The step-down DC-DC converter comprises an overvoltage protection circuit, a voltage input end, a high-side power tube, a low-side power tube, an inductor and a capacitor. And when the feedback voltage is greater than the reference voltage, the high-side power tube is controlled to be switched off through the upper tube control driving circuit, and the low-side power tube is controlled to be switched on periodically through the lower tube control driving circuit. Thus, overvoltage protection of the step-down DC-DC converter is realized by controlling turn-off of the high-side power tube and periodic turn-on of the low-side power tube, and meanwhile, compared with a traditional technology of simultaneously controlling turn-off of the high-side power tube and the low-side power tube, release of output-stage energy and recovery of an output overvoltage state of the DC-DC converter are facilitated.

The utility model discloses an LED detection device with an overvoltage protection device, and the device is characterized in that the device comprises a supporting bottom plate, the two sides of the surface of the supporting bottom plate are fixedly provided with limiting frames, one end of an extrusion threaded rod is rotatably provided with an extrusion plate, the surface of one side of the supporting bottom plate is provided with an input interface, and one side of the input interface is fixedly provided with a digital voltmeter; an output interface is formed in one side of the overvoltage protection groove, a protection plug is installed on one side of the inner wall of the overvoltage protection groove, a protection jack is formed in the other side of the inner wall of the overvoltage protection groove, electric telescopic rods are fixedly installed on the two sides of the protection jack, and a plc is fixedly installed on the surface of the supporting bottom plate. The LED display screen overvoltage protection device has the advantages that power supply voltage input by the input interface is detected through the digital voltmeter, when the input voltage value is too large, the plc controls the electric telescopic rod to extend, the protection plug and the protection jack in the overvoltage protection groove are separated, the LED display screen module is powered off, and overvoltage protection is achieved.

This application relates to the field of charging technologies and discloses a charging circuit, a charging control method, and an electronic device, to perform overvoltage protection on a charging circuit in an electronic device. The charging circuit includes a first power supply terminal, a second power supply terminal, a controller, a first switch, a second switch, a first charging chip, and a second charging chip. The second charging chip supports a fast charging protocol. The first power supply terminal is coupled to the first charging chip through the first switch and coupled to the second charging chip through the second switch, and the first power supply terminal is configured to be coupled to a charger. The first charging chip and the second charging chip are further coupled to the second power supply terminal, to be coupled to a battery. The first charging chip is coupled to a communication terminal of the charger. The first charging chip communicates with the charger to determine that the charger supports the fast charging protocol. The controller controls the first switch to open and the second switch to close, and controls the first charging chip to obtain power from the battery. The first charging chip controls the charger to increase a charging voltage, to fast charge the battery.

The invention discloses a radio frequency power supply circuit and electronic equipment. The radio frequency power supply circuit comprises a power supply module, a first inductor, a power tube, a peak value detection module and a control module. The first end of the first inductor is connected with the power module; the first end of the power tube is connected with the second end of the first inductor and coupled with a load, the second end of the power tube is grounded, and the control end of the power tube is configured to input a radio frequency signal; the peak detection module is connected with the first end of the power tube, and the peak detection module is configured to obtain the peak voltage of the first end of the power tube; the control module is connected with the peak value detection module and the power supply module, and the control module is configured to control the power supply module to reduce the output voltage when the peak value voltage is larger than a first voltage threshold value. Through the above mode, the mismatch risk of the power tube can be effectively reduced, and the overvoltage protection of the power tube can be realized.

The application relates to a circuit for preventing high-voltage external connection of a transmitter output. The circuit comprises a first input end of the circuit for connecting a first output end of an input structure, a second input end of the circuit for connecting a second output end of the input structure, a third input end of the circuit for connecting a first end of a transmitter output structure, a first output end of the circuit for connecting a second end of the transmitter output structure, and a second output end of the circuit for connecting a third end of the transmitter output structure. The circuit can feed back a high-voltage external connection control signal to the transmitter output structure to protect the transmitter.

The present disclosure relates to an overvoltage protection circuit of a power device and an overvoltage protection method based thereon, the circuit comprising: a first voltage acquisition unit, a second voltage acquisition unit, a first comparison unit, a second comparison unit and a control unit; the first voltage acquisition unit is used for acquiring the voltage value of a first node; the second voltage acquisition unit is used for acquiring the voltage value of a second node; the first comparison unit is used for outputting a first signal according to the comparison result of the voltage value of the first node and a first reference voltage value; the second comparison unit is used for outputting a second signal according to the comparison result of the voltage value of the second node and a second reference voltage value; and the control unit is used for adjusting an output signal according to the first signal and the second signal to achieve overvoltage protection of the power device. The present disclosure can achieve overvoltage protection of the power device without relying on the breakdown voltage value of the TVS tube, improve the accuracy of overvoltage protection of the power device, and improve the safety and stability of the electric drive system.

The present invention relates to a gallium nitride device driving circuit with integrated overvoltage protection, comprising: a driving module, a feedback control module and a boost conversion module connected in sequence; the boost conversion module is used to output the output voltage of the driving circuit, and the feedback voltage output terminal of the boost conversion module feeds back the output voltage to the feedback control module; the feedback control module is configured to compare the output voltage with a preset voltage value, and when the output voltage is higher than the preset voltage value, generate a low-level signal and feed it back to the driving module; the driving module is configured to disconnect the internal circuit of the boost conversion module when receiving the low-level signal fed back by the feedback control module. The present invention can realize overvoltage protection of the driving circuit, and solve the problem in the prior art that the integrated driving circuit does not integrate a protection module, which easily causes the output voltage to exceed the rated value, thereby causing device damage.

The utility model belongs to the technical field of switching power supplies, and particularly relates to a switching power supply overvoltage protection circuit, which comprises a voltage detection module, a control module and a switch module, the output end of the rectifier D1 is connected with the positive electrode of a polar capacitor C1, one end of a resistor R7, one end of a resistor R10, one end of a resistor R1 and one end of a resistor R11, and the negative electrode of a pin 4 of the output end of the rectifier D1 is grounded. Compared with the prior art, the utility model has the beneficial effects that the technical problem that electronic equipment is damaged due to alternating-current overvoltage in the prior art is solved, whether alternating-current voltage exceeds a preset protection threshold value or not is judged according to a received voltage signal, and when the alternating-current voltage exceeds the preset protection threshold value, a control signal is sent to the switch module, so that the electronic equipment is protected. Therefore, the circuit is disconnected by the switch module, and overvoltage protection is realized.

The present application provides a supercapacitor module charge and discharge test system, including: a control unit; a first and a second power control unit, respectively connected to the control unit; a reactor, connected to the control unit; a first supercapacitor module, connected to the control unit, and connected in series with the reactor through the first power control unit, and connected to a DC charge and discharge power supply through a first switch; a second supercapacitor module, connected to the control unit, and connected in series with the reactor through the second power control unit, and connected to a DC charge and discharge power supply through a second switch. The present invention also provides a test method for a supercapacitor module charge and discharge test system. The supercapacitor module charge and discharge test system provided by the present invention can break the boundaries of complete sets of products and form a test device that integrates high voltage, controllable kiloampere current testing, and charging and discharging of supercapacitor modules.

This utility model discloses a charger, relating to the field of charger technology, comprising: a charging module, including a constant current charging module for outputting a constant current to the battery and a constant voltage charging module for outputting a constant voltage to the battery; a power supply module for supplying power to the constant current charging module and the constant voltage charging module; and a switching module for controlling the constant current charging module to charge the battery until the battery voltage reaches a threshold, and controlling the constant voltage charging module to charge the battery after the battery voltage reaches the threshold. This utility model controls the constant current charging module to charge the battery until the battery voltage reaches the threshold, and then controls the constant voltage charging module to charge the battery after the battery voltage reaches the threshold, effectively avoiding the aggravated battery polarization caused by continuous constant current in the later stages of charging, and also avoiding damage to the battery caused by excessive current due to excessively high initial charging voltage.

The present invention discloses a battery charging method, storage system, server, medium and product, and relates to the field of server technology. When the current temperature of the charging module reaches the temperature control condition, the remaining time at the maximum temperature of the over-temperature protection is determined according to the current temperature change rate to ensure that the over-temperature protection will not be triggered, that is, the power supply function will not be turned off. Due to the real-time change of the current temperature change rate, the remaining time is also determined in real time, which improves the calculation accuracy and real-time performance of the remaining time; full charge corresponds to the first time required for the battery cell to be fully charged. Based on the remaining time and the first time, the charging current of the charging module is adjusted, and the adjustment process increases or decreases the charging current. The adjustment is dynamically adjusted based on the size relationship between the two time parameters, so that the over-temperature protection is not triggered before the battery is fully charged, that is, when the over-temperature protection is not triggered, it is very likely to increase the charging current and improve the charging speed.

The invention is suitable for the technical field of terminals, and provides a charging and discharging control circuit and foldable electronic equipment. The foldable electronic device comprises a USB interface, a first battery, a second battery, a first load and a second load. The first load comprises a processor; the charging and discharging control circuit comprises a first power supply management module, a second power supply management module and a switch module; the first power management module is used for controlling the first battery to supply power to non-charging equipment when the non-charging equipment is connected to the USB interface and the foldable electronic equipment works in a main equipment mode; the second power management module is used for controlling the second battery to supply power to the second load; the switch module is connected between the USB interface and the second power management module; and the processor is used for controlling the switch module to be switched off when the foldable electronic equipment works in the main equipment mode, so that normal data interaction between the foldable electronic equipment and the non-charging equipment can be ensured.

The utility model relates to the technical field of electronic circuits, in particular to a controller circuit and device, and the controller circuit comprises a DC converter circuit, a power protection circuit, a controller, and a communication isolation circuit of each communication device. The power supply protection circuit can pull down the stabilized voltage to 0V when the stabilized voltage obtained by conversion of the DC converter circuit exceeds a preset stabilized voltage threshold value, so as to realize overvoltage protection for a controller and / or a communication device; moreover, the communication isolation circuit can effectively isolate the controller circuit from the external circuit, so that the problem that the control circuit explodes under the condition that the voltage of the external circuit is too high or the external circuit has open fire is avoided, and the explosion-proof effect is achieved on the premise that an explosion-proof shell does not need to be arranged.

The present invention provides an overvoltage protection circuit and device, the circuit comprising: a first PMOS tube, a second PMOS tube, a third PMOS tube, a fourth PMOS tube, a fifth PMOS tube, a sixth PMOS tube and a level conversion circuit; when the voltage of the external signal end is higher than the carrying voltage of the target chip, the level conversion circuit outputs a preset voltage; there is a voltage difference between the preset voltage and the voltage of the external signal end, the fifth PMOS tube and the sixth PMOS tube are controlled to be turned on, and the second PMOS tube and the fourth PMOS tube are turned off, so as to realize overvoltage protection of the target chip. The circuit can realize overvoltage protection of the chip by only using a single type of high-voltage resistant PMOS tube, thereby reducing the dependence on the process of NMOS devices.

This application discloses an overvoltage protection circuit for a high-voltage circuit. The circuit includes: an input terminal of a voltage detection module electrically connected to a high-voltage bus and one end of a shunt module; an output terminal of the voltage detection module electrically connected to one input terminal of an overvoltage detection module; an output terminal of a reference voltage acquisition module electrically connected to the other input terminal of the overvoltage detection module; and an output terminal of the overvoltage detection module electrically connected to the other end of the shunt module. The voltage detection module divides the input high-voltage bus voltage and outputs a detection voltage; the reference voltage acquisition module outputs a reference voltage; the overvoltage detection module compares the detection voltage with the reference voltage and outputs either a non-overvoltage signal or an overvoltage signal; and the shunt module shunts the current of the high-voltage bus according to the overvoltage signal to achieve overvoltage protection. This disclosure solves the technical problem that traditional overvoltage protection devices are difficult to apply in high-voltage and ultra-high-voltage scenarios, and achieves overvoltage protection for high-voltage circuits.

The invention discloses an aircraft fuel pump which comprises a pump shell, a pump core, a stator, a rotor and a rotating plate. One end of the pump core is arranged in the pump shell, the stator and the rotor are arranged in the pump core, the rotor is located in the stator, the rotating plate is arranged in the rotor and rotates along with the rotor, and the rotating plate extends out of the rotor in the radial direction and is close to the inner wall of the stator. Wherein the pump shell is provided with an oil inlet end and an oil outlet end which are intersected, a self-sealing valve mechanism is arranged in the oil inlet end, and a one-way valve mechanism is arranged in the oil outlet end. Fuel oil is continuously conveyed to the oil outlet end of the pump shell after being pressurized through the rotary plate, the oil inlet end is provided with a self-sealing valve mechanism, the oil outlet end is provided with a one-way valve mechanism, the fuel oil is prevented from leaking outwards after the pump core is disassembled, and the pump shell and the pump core are independently replaceable units, are matched at will and are convenient to replace.