33results about How to "Protection output" patented technology

An electrical interface device (10) for towing, operable to facilitate releasably coupling one or more electrical subsystems of a towing vehicle (12) and a towed vehicle, and including associated modular, removable circuitry (24). The circuitry (24) may provide overload, short-circuit, and reverse connection protection and power signal filtering. Alternative or additional circuitry may be added to support other functionality, including interfacing a brake control subsystem. Circular receptacle and flat plug connectors (20,22) are provided to accommodate without modification a variety of electrical connectors. Covers (32,33) are also provided to protect unused connectors from adverse environmental conditions.

A differential bus network, in general, or a controller area network (CAN) driver, in particular, controls and minimizes the variation on the common-mode signal of the CAN bus. This CAN driver also provides improved symmetry between its differential output signals, CANH and CANL, and provides protection for its low voltage devices from voltage transients occurring on its output lines. The common-mode signal is sensed and buffered, then during the dominant to recessive transition, the bus signals are shorted to the buffered common mode voltage. Specifically, additional switches or transistors are used to pull the differential output signals, CANH and CANL, to the common mode signal VCM when the state of the CAN bus transitions from dominant to recessive. This improvement minimizes high frequency spikes in the common-mode signal and eliminates DC shifts during transitions of the state of the CAN bus. A driver system may include a plurality of CAN drivers are serially interconnected to form a driver system, wherein each downstream driver stage receives a time-delayed form of the digital input signal TxD, each stage providing a time-delayed contribution to the differential output signals of the overall driver system.

A hand-held power tool comprising an output shaft rotatable around a tool axis of rotation, a tool housing portion radially disposed relative to the output shaft, an illuminating element for illuminating a work area of the tool, a lens positioned adjacent the illuminating element, and a cover that secures the lens and the illuminating element to the tool housing portion. At least a portion of the cover is closer to the axis of rotation than the lens is to the axis of rotation.

The invention discloses a high-power electromagnetic surveying transmitter system which comprises a generator set, a three-phase rectification bridge, a filter capacitor, an H type inversion bridge, a booster transformer, a single-phase rectification bridge, a transmitting bridge, an electrode, a temperature detection circuit, a first voltage detection circuit, a second voltage detection circuit, a first current detection circuit, a second current detection circuit, a first central processing unit, a second central processing unit and a transmitting control platform. Transmitting voltage parameter and transmitting current parameter are transferred through communication, and actual transmitting voltage and actual transmitting current are displayed in real time through parameter feedback; transmitting parameters of the transmitting control platform are received to control the transmitting of the transmitting bridge, and transmitting voltage and transmitting current signals are acquired and fed back to the transmitting control platform in real time; the PWM (pulse-width modulation) of the H type inversion bridge is realized to obtain stable and reliable transmitting signals; and the electrode is the signal transmitting port of the system. Thus, the accuracy and response speed of the transmitted waveform are improved.

The invention provides a first in first out storer circuit structure based on a random access memory (RAM) and relates to the field of chip design. A multi-input single-output FIFO structure body is established, a multi-access interface RAM storage body is established through at least three ordinary single-access interface RAM storage bodies, a configurable ranking mode is set, an independent read-write FIFO pointer is set, an FIFO upper overflowing error mark is achieved through a marked vector mark bit corresponding to an address in writing, and an FIFO lower overflowing error mark is output through an unmarked vector mark bit corresponding to the address in reading. By means of a novel FIFO structure, multi-channel message parallel writing FIFO can be directly achieved. Furthermore, automatic ranking can be achieved according to a set mode, serial can be output through FIFO, and a parallel storage function and a serial scheduling function can be automatically achieved.

The present invention relates to a power supply with output protection and a control method of the power supply. The invention mainly provides a pre-protection value lower than a default over-current protection value. When a present output current of the power supply is higher than or equal to the pre-protection value and is lower than the over-current protection value, the method firstly determines whether the power supply has abnormal conditions. When the power supply has abnormal conditions, the method can automatically provide or stop providing a working voltage to a load. When the present output current is further higher than or equal to the over-current protection value, the method takes an over-current protection action. By multi-level monitoring of the current values, the invention properly provides an over-current protection.

An apparatus for supplying an internal combustion engine with a compressed air charge is disclosed. The apparatus includes a first compressing device, for example a turbocharger, and a second compressing device, for example an electric supercharger. The second compressing device is downstream of the first compressing device. A part, for example the bearing assembly, of the second compressing device is thermally shielded from the heat of the compressed air charge by a labyrinth seal.

The invention relates to the technical field of welding, and discloses application of an arc discharging type stud welding technology to a welding tie pole. The defects of the traditional welding technology are overcome, arc discharging type stud welding is creatively introduced to the welding tie pole, and application of the arc discharging type stud welding to the tie pole is provided. The arc discharging type stud welding technology and device are scientifically improved, the arc discharging type stud welding technology is successfully applied to the tie pole, the obvious beneficial effects that the welding deformation is small, the number of adjustment working procedures is greatly reduced, even, adjustment is not needed, no welding splashes exist on the surface, the number of slag removing working procedures is reduced, and the welding defects caused by the manual factors are avoided are achieved, the improvement of product quality is ensured, the breaking phenomenon of the tie pole by a customer is obviously reduced, no wire filling is needed in the welding process, the production efficiency is improved, and the manufacturing cost is reduced.

This invention relates to control device about one equal drive power supplier, which comprises one feedback control circuit to supply power and flexible input end is used to set flexible start time of power supplier with first and second output ends are used to output first and second signals to couple power supplier one first switch and second switch to control power supplier output with one protection unit composed of voltage input end, current detection end and power detection end and signal detection end.

The invention relates to a sensor chip packaging structure, in particular to a ceramic silicon ceramic three-layer leadless packaging structure of a high-range acceleration sensor, which comprises a layer of low-temperature co-fired ceramic sheets with one surface capable of being grounded and brazed, wherein the non-brazed surface adopts an anode bonding technology to achieve bonding of a cookedceramic sheet and the back surface of a sensitive structure; the front surface of the sensitive structure is also bonded with the three layers of cooked ceramic sheets by adopting the anode bonding; the first layer is a low-temperature co-fired ceramic frame with the same area as a sensor frame, meanwhile, PAD points of the sensitive structure are connected to the second layer circuit through laser perforating and filling holes by using slurry, the second layer achieves the function of circuit transfer through slurry printing, and transmits signals to the third layer of the cooked ceramic sheets, namely the top layer of the packaging structure; the top layer of the packaging structure is coated with brazing slurry, therefore, the cooked ceramic sheet can be connected with output wires through brazing. According to the invention, the packaging structure area is minimized, the leadless packaging of the acceleration sensor is achieved, and the reliability of the sensor is greatly improved.

A position detecting device has an output circuit, which controls voltages of signal lines connecting a power supply and a ground by a power side transistor and a ground side transistor. An output signal line connects a connection point of the signal lines and an output terminal. A first comparator circuit outputs a signal “1” when a current flowing in the line between the power supply and the connection point is larger than a normal current flowing into the ground from the power supply in a normal state. A second comparator circuit outputs a signal “1” when a current flowing in the line between the connection point and the ground is larger than the normal current. When the signal “1” is output from the first comparator circuit or the second comparator circuit, a cutoff circuit turns off a switch disposed in the output signal line.

The present invention relates to a power supply with output protection and a control method of the power supply. The invention mainly provides a pre-protection value lower than a default over-current protection value. When a present output current of the power supply is higher than or equal to the pre-protection value and is lower than the over-current protection value, the method firstly determines whether the power supply has abnormal conditions. When the power supply has abnormal conditions, the method can automatically provide or stop providing a working voltage to a load. When the present output current is further higher than or equal to the over-current protection value, the method takes an over-current protection action. By multi-level monitoring of the current values, the invention properly provides an over-current protection.

A circuit for reducing the variations of auto-supply voltage of a control circuit of a switching power supply, where the control circuit supplies an activation or deactivation signal of a power transistor, includes an auto-supply voltage generator, a controlled switch capable of selectively connecting the generator to the control circuit, and a driving circuit of the controlled switch that supplies a closing signal of the controlled switch after a predefined delay of time starting from the deactivation command.

The invention provides an output control system for an audio power amplifier. The output control system for the audio power amplifier comprises a switch module, a voltage division module and a processing module, wherein the switch module is connected with the audio power amplifier and speakers, and is used for outputting audio signals output by the audio power amplifier or preventing from outputting the audio signals to the speakers; the voltage division module is connected with the audio power amplifier and the switch module, and is used for dividing the voltage provided by an external power supply; the processing module is connected with the voltage division module, comprises an analog-to-digital conversion interface and an universal input / output interface, and is used for reading a voltage value which is divided by the voltage division module and is output to the analog-to-digital conversion interface and judging whether the voltage value of the analog-to-digital conversion interface is smaller than a preset voltage threshold; if the voltage value of the analog-to-digital conversion interface is smaller than the preset voltage threshold, the processing module pulls up the voltage of the universal input / output interface and enables the switch module; if the voltage value of the analog-to-digital conversion interface is not smaller than the preset voltage threshold, the voltage of the universal input / output interface is low level, and the processing module disables the switch module. The output control system for the audio power amplifier, which is provided by the invention, can protect the output of the audio power amplifier and prevents external high voltage from damaging the audio power amplifier.

The invention provides a lighting control circuit and signal split-screen conversion lighting equipment with a protection function. The lighting control circuit comprises an input and output unit, a misplug protection unit and a control unit, wherein the input and output unit comprises an input interface module and at least two output interface modules; the input interface module comprises at least three input interfaces; each output interface module comprises at least three output interfaces; the control unit is used for controlling whether a second input interface and each second output interface are conducted or not and controlling the whether a third input interface and each third output interface are conducted or not; and the misplug protection unit is used for controlling the secondinput interface to output a high power supply voltage signal to each first output interface when a low power supply voltage signal is connected to the second input interface, and controlling the second input interface not to output the voltage signal to each first output interface when no signal is connected to the second input interface. According to the lighting control circuit, multiple screenscan be lighted through one lighting device, so that the cost is reduced, an output pin of the lighting device can be protected and the phenomenon of burnout of various to-be-tested display panels isavoided.

This invention relates to control device about one equal drive power supplier, which comprises one feedback control circuit to supply power and flexible input end is used to set flexible start time of power supplier with first and second output ends are used to output first and second signals to couple power supplier one first switch and second switch to control power supplier output with one protection unit composed of voltage input end, current detection end and power detection end and signal detection end.

An interface circuit configurable in input and output modes comprises a current source; an input / output node; a diode to prevent current from flowing from the input / output node to the current source; a first switch to short-circuit the diode when closed; and a second switch to form a ground path from the input / output node when closed. In input mode, the first switch is closed and the state of a connected sensor circuit may be measured. In the output mode, the first switch is open, and the second switch may be closed to activate an output circuit. In the output mode, power dissipation may be monitored, and the diode may protect the current source and measurement node from current flowing through the output circuit. In the input mode, closing the first switch may prevent the diode from introducing measurement errors due to non-linear attenuation of perturbative AC signals.

A plate-like detection plate portion that undergoes strain due to contact with an object is used for detecting the presence of an object that can come into contact with a liquid ejecting unit with relative movement between a medium and the liquid ejecting unit, and is provided with a piezoelectric film sensor that outputs an electric signal corresponding to strain of the detection plate portion. The piezoelectric film sensor includes a detection film portion in which a piezoelectric element that causes a voltage change corresponding to the strain is arranged, and an output circuit portion that converts the voltage change of the detection film portion into an electric signal and outputs the electric signal. The output circuit portion is provided on a second plate surface, which is a rear surface of a first plate surface facing the medium, of the detection plate portion.

The invention discloses a pneumatic engineering LED lamp for outdoor operation. The LED lamp comprises LED searching lamps, support beams, a first extending arm and a second extending arm, wherein oneend of the second extending arm is arranged at one end of the first extending arm; the two support beams are arranged above the first extending arm at intervals; the LED searching lamps are arrangedon the support beams; a pair of LED searching lamps is arranged at each of two sides of the first extending arm; a pneumatic valve is arranged on the lateral side of the first extending arm; a main path of the pneumatic valve is connected onto a compressor through an air pipe; and a branch of the pneumatic valve is connected onto a pneumatic cylinder and a plurality of rotating air cylinders. Fromthe angles of using clean energy sources and saving the labor, an engineering LED searching lamp extending mechanism is improved in a pneumatic power mode, so that the LED searching lamp extending mechanism has an automatic extending effect; the risk of people during high-altitude operation and inconvenience caused by heavy equipment unfolding and folding collection are avoided; and the efficiency is greatly improved.

The invention relates to a novel AC voltage detection protection circuit, which comprises a switching power supply circuit, a protection circuit and a control circuit, wherein the switching power supply circuit is provided with an input end connected with an AC power grid; the protection circuit comprises a processing module and a power supply module; the switching power supply circuit outputs a first voltage value and sends the first voltage value to the processing module; the processing module processes the first voltage value to obtain a second voltage value; the second voltage value is compared with a preset voltage value to judge whether to drive the power supply module to operate or not; and when the second voltage value is greater than the preset voltage value, the power supply module is not conducted so as not to supply power to the switching power supply circuit, and meanwhile, the control circuit reads the conduction state of the power supply module and judges whether to execute a protection action or not according to the conduction state of the power supply module so as to protect the switching power supply circuit. The system is simple in structure, and has the characteristics of full isolation, low cost, high reliability and high expandability.

The invention discloses a convenient lumbar vertebra exercising device for neurosurgery, and relates to the technical field of neurosurgery auxiliary equipment. An arch plate is movably arranged in anopen groove, end plates are integrally formed in front and back of the left and right edges of the arch plate, a threaded hole is formed in the end plate located at the front end of the left side, aball bearing mounting hole is formed in the end plate located at the front end of the right side, and inserting holes are formed in the end plates at the rear ends of the left and right sides; the right side wall of the end plate is fixed to the right side wall of the open groove, and the left side wall of the end plate movably abuts against the left side of the open groove; an ejector rod is movably arranged at the bottom of the arch plate in an abutting mode and fixed to an output shaft of an electric lifting rod, and the bottom of the electric lifting rod is fixed to the inner bottom wall of a base; a screw rod is arranged in the base in the front of the electric lifting rod, and one end of the screw rod is screwed into the ball bearing mounting hole through a ball bearing. The device has the advantages of simple structure, easy movement, low investment cost, easy popularization, high exercise efficiency, convenient adjustment and stronger applicability.

The invention provides a first-in-first-out memory circuit structure based on a random access memory, relates to the field of chip design, constructs a multi-input single-output FIFO structure, and uses at least three ordinary single-access interface RAM storage bodies to construct a multi-access interface RAM memory bank, set configurable sorting mode, set independent read and write FIFO pointers, realize FIFO overflow error flag according to the vector flag bit corresponding to the address when writing, and realize FIFO overflow error flag according to the vector flag corresponding to the address when reading Bit no flag implements output FIFO underflow error flag. Using a new FIFO structure, it is possible to directly write multiple channels of messages into the FIFO in parallel, and then automatically sort them according to the set mode, serially output from the FIFO, and automatically complete the two functions of parallel storage and serial scheduling.

An ultrasonic probe holder which holds and houses an ultrasonic probe including a head including an output surface which outputs ultrasonic waves and a grip extending from the head includes: a bottom that includes a first opening having a size such that the head and the grip of the ultrasonic probe do not pass therethrough; and a tube that extends from the bottom and includes a second opening having a size such that the head and the grip of the ultrasonic probe pass therethrough at an extended end and a slit connected to the second opening and the first opening on the bottom.