3181 results about "Short circuit protection" patented technology

The present invention discloses a control device and method for over current or short circuit protection of electronic cigarette. The control device includes an input module, a power module, a heating element, a switch control module, a comparator, and a FET; the FET is used to detect an operating voltage generated by an operating current following through the internal resistance of the FET, and the operating voltage is transmitted to the comparator; the comparator compares a reference voltage with the operating voltage, and output a potential signal to the switch control module, the switch control module turns off the FET or maintains it turning on corresponding to the potential signal, further the FET powers off or powers on the heating element. Therefore the circuit of electronic cigarette is protected in over current or short circuit condition.

The present disclosure relates to an electronic cigarette and an integrated circuit therefor. The integrated circuit incorporates a bi-directional control scheme for a charging process of a rechargeable battery and a discharging process of the rechargeable battery, and includes power devices used in both the processes. Thus, the integrated circuit has less semiconductor devices and lowered manufacturer cost. The integrated circuit has a temperature detection function for providing overheat protection of the system so that it operates in a safe temperature range. The integrated circuit also has a battery current-limiting function for limiting an output current of the rechargeable battery and protecting the same. The integrated circuit further has a short-circuit protection function for limiting an output current of the integrated circuit when the output current is too large and protecting the system.

The functionality of electronic convertors for low voltage filament lamp applications, such as halogen lamps, can be increased by including auxiliary circuits. Such auxiliary circuits may include gate drive resistors; a charge pump for sustaining the DC supply; open circuit protection; short circuit protection; thermal protection; extended resetting time; latched shutdown; self-dimming; a digital (DALI) interface; and line voltage compensation.

A device comprising an array of sensors and a multiplicity of bus lines, each sensor being electrically connected to a respective bus line and comprising a respective multiplicity of groups of micromachined sensor cells, the sensor cell groups of a particular sensor being electrically coupled to each other via the bus line to which that sensor is connected, each sensor cell group comprising a respective multiplicity of micromachined sensor cells that are electrically interconnected to each other and not switchably disconnectable from each other, the device further comprising means for isolating any one of the sensor cell groups from its associated bus line and in response to any one of the micromachined sensor cells of that sensor cell group being short-circuited to ground. In one implementation, the isolating means comprise a multiplicity of fuses. In another implementation, the isolating means comprise a multiplicity of short circuit protection modules, each module comprising a current sensor circuit and an electrical isolation switch.

A boost converter includes a load disconnect switch connected between a voltage input terminal and an inductor, a power switch connected to the inductor by a switching node, a diode connected between the switching node and a voltage output terminal, and an output capacitor connected to the voltage output terminal to provide an output voltage. A protection apparatus is connected to the load disconnect switch, switching node and power switch to monitor the voltage at the switching node and the output voltage to provide open circuit and short circuit protection for the boost converter.

The invention relates to a protection circuit driven by insulated gate bipolar transistor (IGBT). It is composed of power supply, IGBT, a signal circuit driven by upper and lower bridges, light coupler, a control circuit with a switch triode, an amplifying circuit for driving signal, a protection circuit for detecting and adjusting the voltages between collector and emitter of IGBT. Said protection circuit includes a short circuit protection circuit, fault latching circuit and fault soft switch off circuit. When the voltage of collector-emitter of IGBT is abnormal, the voltage of insulated gate of IGBT is adjusted to lower than threshold voltage, by the operation of short circuit protection circuit as well as control and amplifying circuit. Thus the IGBT is cut-off and the close latching is realized by that fault latching circuit. It guarantees to close off IGBT before CPU receives the fault signal and closes off driving signal.

A fault handling system for short circuit recovery in three-phase multiple-level inverter bridges, used to drive inductive loads, which waits for either desaturation of switches or expiration of a delay period based upon an amount of time before saturated switches are damaged before commanding off switches that are saturated, and which artificially creates a dead-short across the three-phase output to force switches conducting a fault current to desaturate. By delaying the switching-off of the inverter bridge during a fault, waiting for desaturation to occur, the statistical likelihood of switch survival is improved.

The invention discloses an induction cooker heating device. A main control chip module (10) connected with a heating control circuit is arranged in a cooker body (1), and the cooker body is provided with a circuit coupling interface A (3) of the heating control circuit. A sensor module (40) is arranged in a pot body (2), and a circuit coupling interface B (3) electrically connected with the sensormodule is arranged in the bottom of the pot body. When the bottom seat of the pot body is on the top of the cooker body, the circuit coupling interface B is jointed with the circuit coupling interface A, so that the main control chip module can be electrically connected with the sensor module so as to control heating. An induction cooker of the induction cooker heating device can be used alone orconduct combined use, the functions are complete, and the individual placement space of the induction cooker is saved. The assembly structure is consistent with user usages. During assembly, whetherthe pot body is assembled in place or not can be detected and short-circuit protection can be realized through a pot assembly detection module and a switching circuit module. Thus, the damage of a main control chip is prevented, and the equipment safety and reliability is high.

A compact lower cost programmable logic controller with modular I / O is described. SPI bus is used for accessing multi-byte data from I / O modules, while 8 bit data bus is used to access single byte data from I / O modules. Compact I / O modules with use with the PLC are described. The include short circuit proof DC output modules, Relay output with built-in electromagnetic shield, analog modules with laser trimmed resistors, and high speed counter modules.

The present invention provides a single circuit that may have multiple protection functions for a DC voltage power supply. The present invention may include separate circuit modules that are employed individually, or in various combinations. These separate circuit modules include: a temperature and input voltage variation compensated current limit circuit; an inrush and transient current limit combined with an overload and short circuit protection circuit; and a self adaptive short circuit turn-off timing circuit.

The invention provides a driving control circuit and an over-current protection method of a GOA circuit thereof. The method comprises the steps of isolating or closing the GOA circuit; receiving at least one current signal from a control panel; comparing the current signal with a preset short circuit current threshold value; selecting the operation mode of the GOA circuit according to the comparison result; if the current signal is less than the short circuit current threshold, opening the GOA circuit to enter a normal working mode; if the current signal is more than or equal to the short circuit current threshold, keeping the GOA circuit closed to enter an over-current protecting mode. Compared with the prior art, the method has the advantages that the GOA circuit can be delayed to open or close, so that the short circuit protection mechanism can independently determine whether each current signal of the control plate exceeds the short circuit current threshold, the mistaken touch protection action caused by different current due to different plane display mode / three-dimensional display mode and different temperature can be avoided, and as a result, the operation reliability of the GOA circuit can be improved.

A converter and a driving method thereof are provided. The converter can determine the output short state of the converter after the soft start is finished by using a detection signal that corresponds to an input signal while a switched is turned on and that corresponds to an output signal while the switch is turned off, so as to convert the input signal into the output signal according to a switching operation of the switch. The converter can determine the overload state of the converter by using a feedback voltage corresponding to the output signal, and terminate the switching operation when the converter is in an output short state or overload state.

A backup power system for household or structural appliances that normally receives power from a primary power source, and is not an uninterruptible power system. Included are batteries, a battery charger, a power interface interconnecting the primary power source and the backup power system, power relays that comprise a switching matrix of individually operating relays that connect and disconnect the sources and appliances one and only one at a time, sensing devices to monitor the currents and voltages, conversion of the DC voltage of the batteries to AC voltage for backup power to the appliances, circuitry for preventing peak power demands by delivering sequentially selected appliances, one and only one at a time and only when power is demanded by each individually selected appliance, thereby prolonging the operating lifetime of fully charged batteries. Short circuit protection is provided to protect the backup power system from appliance short circuits, and to protect the batteries in the event of a short circuit within the system.

The present invention discloses a control device and method for over current or short circuit protection of electronic cigarette. The control device includes an input module, a power module, a heating element, a switch control module, a comparator, and a FET; the FET is used to detect an operating voltage generated by an operating current following through the internal resistance of the FET, and the operating voltage is transmitted to the comparator; the comparator compares a reference voltage with the operating voltage, and output a potential signal to the switch control module, the switch control module turns off the FET or maintains it turning on corresponding to the potential signal, further the FET powers off or powers on the heating element. Therefore the circuit of electronic cigarette is protected in over current or short circuit condition.

The invention provides a light-emitting diode (LED) driving circuit. A second end of each light string is connected with a current balancer in series to perform self-feedback control so as to adjust the current passing through each light string respectively; a voltage compensation circuit is added to finely adjust the voltage of each light string to ensure that each light string with different straight-forward voltage can be completely illuminated; besides, a short circuit protective circuit is added to ensure that the LED driving circuit is turned off when the LED short circuit happens in the light string, so the light string is protected from being burnt out by excess current. The LED driving circuit does not need to adopt a special LED controller, and the framework of the driving circuit is quite simple, so that the cost can be greatly reduced.

The invention discloses a high-power direct-current charging machine / pile DCDC conversion device for an electric automobile and a control method of the high-power direct-current charging machine / pile DCDC conversion device. A multiphase interleaving voltage decrease and increase adjustment technology is adopted in the device, the requirements for adjustment of wide voltage input and wide voltage output are met, and through the modularized control structure design, the output of charging energy can be controlled, the output ripples can be reduced, and power and efficiency are improved. The output voltage and the current of the device can both be controlled, and the device has the protection functions of current protection, voltage protection, temperature protection, power protection, drive short circuit protection and the like; and a pre-starting current limiting module, a charging pre-starting and discharging protection module, a hardware overcurrent protection module and a fault signal processing module are additionally arranged, so that the safe reliability of the device is effectively enhanced. The device is small in ripple, high in conversion efficiency, low in cost, simple in structure, small in start current and high in safe reliability, the device can be used for high-power direct-current charging machine / pile DCDC power conversion for the electric automobile and also be used for other power and power supply equipment, and the device is suitable for being used in various power and electronic fields.

A switch-type power converter comprising an FET switch operating in a variable duty cycle mode under the control of a Unitrode 3846 integrated circuit controller. Indications of excess input voltage and reverse battery connections are provided by circuits including an element which permanently changes state. A cooling fan mounted on a finned heat sink is operated in a variable speed mode. A single thermistor sensor provides inputs to both the fan speed control and a thermal shutdown circuit connected to shut down the gate drives to the FET switch in the event of a high temperature condition. Another shutdown function is provided in response to an input overvoltage condition by way of an operational amplifier. The converter uses foldback for short circuit protection and is compatible with microprocessor units to selectively provide multiple output voltage levels.

A DC solid power switch circuit includes a main power circuit, a subsidiary power circuit parallel to the load, an isolated drive protection circuit composed of a drive supply, a drive isolation circuit, a slow turned-on-off control circuit, a discriminating control circuit, a short circuit protection circuit and a push and pull output circuit, a current detection circuit, a voltage detection circuit, a main power valve drive circuit, a light-coupled isolating circuit, an assistant power valve switch-on logic circuit and a power drive output circuit, which can limit the current impulse in the period of switching on capacitive load, and suppress the peak voltage in turning off the inductive load.

The invention discloses a surge suppression circuit which comprises a voltage input end, a voltage output end, a field-effect tube, a transistor, a capacitor, a first resistor, a second resistor and a third resistor, wherein the voltage input end is connected with the source electrode of the field-effect tube and the emitting electrode of the transistor respectively; the voltage input end is also connected with the drain electrode of the field-effect tube through the first resistor; the collector electrode of the field-effect tube is grounded through the third resistor; the base electrode of the transistor is connected with the drain electrode of the field-effect tube through the second resistor; and the drain electrode of the field-effect tube is grounded through the capacitor and also connected with the voltage output end. The surge suppression circuit suppresses surge voltage effectively; after the circuit is in a steady state, the power consumption of the surge suppression circuit is reduced; the surge suppression circuit has the function of load short circuit protection; and when an external power supply generates surge voltage, the surge suppression circuit offers dynamic and real-time protection.

The invention exposes a lithium cell management system which comprises a processor, a power supply module, a voltage sampling module, a large current detecting and controlling module, a low current detecting and controlling module, a short circuit detecting and controlling, an over current detecting and controlling module, a button awakening and detecting module, a load awakening module, an electric quantity display module, a temperature detecting module, a charger detecting module, a discharge port reverse electromotive force absorbing module, a charge switch and a control module of the charge switch. The lithium cell management system provided by the invention can effectively reduce energy consumption. The system provided by the invention provide a lithium cell pack with over charge protection function, over discharge protection function, over current protection function, short circuit protection function, temperature protection function as well as electric quantity display function and low current detection discharge prohibition function. In case of any situation of over discharge protection, over current protection, short circuit protection, temperature protection, charge or discharge failure or very low current discharge, a whole circuit enters a dormant state.

The invention relates to a light emitting diode driving circuit for driving a plurality of light emitting diode chains. The light emitting diode driving circuit comprises a plurality of constant current circuits and a plurality of short-circuit protection circuits; a transistor and a detection resistor in each constant current circuit are coupled in series between the output end and the ground end of a corresponding light emitting diode chain; and when the constant current circuits work normally, by comparing a reference voltage with a detection voltage generated by the detection resistor, a feedback circuit in each constant current circuit outputs a signal to control the size of current passing through the transistor to achieve constant current control; in addition, each short-circuit protection circuit is coupled with the output end of the corresponding light emitting diode chain and the corresponding constant current circuit and is used for outputting a short circuit signal to cut off the transistor of the corresponding constant current circuit to turn off the corresponding light emitting diode chain when the voltage of the output end of the corresponding light emitting diode chain reaches a preset voltage and the voltage of the input end of a short circuit signal generation circuit in the short-circuit protection circuit reaches a preset voltage.

The present invention provides a high-reliability motor drive device, a fluid compression system and an air conditioner. The motor drive device comprises an element short-circuit protection unit (12) which stops the drive of a switching element when a current input from a current detector (20) exceeds a short-circuit protection threshold for preventing short-circuit in an inverter circuit (11). An inverter control unit (40) presumes the current of a motor (M) according the current input from the current detector (20), and performs a process of stopping the drive of the switching element when the current of the motor exceeds other current thresholds related to temperature protection of the switching element and / or demagnetization protection of the motor (M). The processing of the element short-circuit protection unit (12) is carried out without the intervention of a micro computer, and the processing of the inverter control unit (40) is carried out with the intervention of the micro computer.

An electrical protection circuitry for a docking station base of a hand held meter and method thereof are disclosed. In the event of a short circuit at a meter interface connector, the protection circuitry removes power at the meter interface connector. Similarly, in the event of an applied voltage outside a specified operating range of the base, the protection circuitry removes power to the meter interface connector. These conditions of the electrical system of the base are monitored regardless whether the meter or the meter's battery is electrically connected to the base. The protection circuitry also provides a visual indication in the event of either the over current and under / over voltage conditions. Additionally, the base is designed to prevent liquid from pooling inside a pocket used to cradle and hold the meter in the base through the use of a drain located at the lowest point in the pocket.

The invention belongs to the electronic technical field, and relates to a constant current outputting and driving circuit of a current sink, which has the load short circuit protecting function. The constant current outputting and driving circuit comprises a driving unit and a load short circuit protecting unit, wherein, the driving unit provides a drive working current for load; the load short circuit protecting unit comprises a sampling circuit, a comparing circuit and a control signal output / turn-off circuit; when the load normally works, the load short circuit protecting unit provides a control signal for the power switch tube of the driving unit; when the load has a short circuit, the load short circuit protecting unit outputs low level, thereby automatically cutting off the power switch tube of the driving unit, protecting the whole driving circuit, and avoiding the chip damage caused by the overlarge current during the load short circuit. As the source end of a sampling MOS tube is connected with the input end, the constant current outputting and driving circuit is high voltage resistant, and does not need an additional ESD structure; at the same time, the adopted circuit elements are basic circuit elements such as logic gates, selectors, MOS tubes, capacitors, etc., thereby having the advantages of low cost, simple structure, good reliability, etc. The constant current outputting and driving circuit can be not only applied to the LED drive.

The invention relates to a load short-circuit protection circuit connected between a storage battery and a load circuit. The load short-circuit protection circuit comprises an MOS (Metal Oxide Semiconductor) tube protection circuit, a short-circuit detection circuit, a singlechip and an MOS tube switching circuit, wherein the MOS tube protection circuit is used for the reverse connection protection of the storage battery; the short-circuit detection circuit is used for detecting the short-circuit of the load circuit; the singlechip is used for sending out a switching signal according to a detection result of the short-circuit detection result; the MOS tube switching circuit is used for switching on or off the load circuit according to the switching signal; the short-circuit detection circuit comprises a comparer and a reference voltage generation circuit; the reference voltage generation circuit is connected to a first input end of the comparer; a source electrode of a first MOS tube of the MOS tube protection circuit is connected to a second input end of the comparer; and the output end of the comparer is connected to a first input end of the singlechip. The load short-circuit protection circuit is used for a load short-circuit protection circuit of a solar controller, has low cost, cannot increase the impedance of a load loop and has the function of eliminating instantaneoushigh voltage.

An H-bridge, phase shifted resonant converter, with symmetrical switched currents is described. This includes open and short circuit protection, with phase shift operation to zero output. The proposed circuit includes an H-bridge converter, employing the use of a “loosely” coupled inductor in place of the standard series inductor(s) to reduce the peak currents. In addition, the current will be symmetrical in all of the H-bridge switching devices. Furthermore, the impedance of the “loosely” coupled inductor controls the maximum current in the H-bridge in an open, short, or under load conditions. The “loosely” coupled inductor, with the addition of a small AC load, enhances the operation of the converter near zero output.The control circuit of the H-bridge converter can be modulated to completely shut off the output without the introduction of complex circuitry.

A modular control assembly is provided for on-machine control of a desired machine. One embodiment has a machine mountable base and a replaceable control unit, wherein the machine mountable base has a machine protection device. In various embodiments of the machine mountable base, the machine protection device may have a short-circuit protective device and a disconnect device. In addition, various embodiments of the replaceable control unit may have a variable frequency drive, a soft start device, or an adjustable overload protection device.

The invention relates to a radiation-proof self-recovery over-current / short-circuit protection circuit for a satellite. On the basis of a line structure, the self-recovery over-current / short-circuit protection function is realized. Moreover, the circuit has advantages of reasonable design, small size, and light weight. The radiation-proof self-restoring over-current / short-circuit protection circuit is composed of a power supply module, a triode driver module, a VDMOS tube module including a VDMOS tube Q2, a current detection, amplifier and comparator module, a trigger feedback module having a D trigger U3, and a precision sampling resistor RS1 connected in series to a bus. The power supply module is used for providing power for the current detection, amplifier and comparator module and the trigger feedback module through buses. The input terminal of the triode driver module is connected with an input signal of the control circuit and the output terminal is connected with a gate terminal of the VDMOS tube Q2; and a source end of the VDMOS tube Q2 is connected with the bus by the precision sampling resistor RS1 and a drain end is grounded by a resistor R13. The current detection, amplifier and comparator module consists of a current detection chip U1 for current detection and signal amplification and a comparator U2.

The invention discloses a light-emitting diode (LED) backlight driving circuit and a backlight module. According to the LED backlight driving circuit, a voltage conversion unit is used for converting the output voltage of an external power supply into driving voltage required by an LED; an output end of the voltage conversion unit is connected to an anode of the LED and used for supplying the required driving voltage to the LED; a driving unit is used for controlling the voltage conversion unit to realize voltage conversion; a circuit protection unit is connected in series between a cathode of the LED and the driving unit; the maximum allowable power of the circuit protection unit is smaller than power borne by the circuit protection unit when the driving voltage of the LED is directly applied to the circuit protection unit; and a control unit outputs an operation stopping control signal to the driving unit when the circuit protection unit is open-circuited. In the mode, a circuit device can be protected from being damaged, so an LED short-circuit protection function is safe and reliable.