107 results about "Open collector" patented technology

The invention relates to a method and a device for adhesion detection of a main contact of an alternating-current contactor to solve the problem that the main contact fails to disconnect in abnormality of the contactor. The device comprises an alternating-current contactor major loop, an alternating-current contactor control loop, an adhesion signal detection circuit and a master controller control circuit. The adhesion detection circuit takes signals from the lower end of the alternating-current contactor, an intermediate relay of the contactor control loop and an alternating-current contactor auxiliary contact. The adhesion detection circuit adopts passive output for outputting signals in an open-collector output mode, and the master controller control circuit takes a PLC (programmable logic controller) or MCU (micro controller unit) as the core and is capable of driving the intermediate relay to realize control of the alternating-current contactor and a forestage power source thereof. The device has the advantages of simple structure and stability and reliability in operation, various operating states of the alternating-current contactor can be detected in real time, fault signals are given out immediately once adhesion occurs, and the forestage power source is disconnected through the master controller to guarantee safety of field personnel and property.

A semiconductor power switch comprises at least a first IGBT and a second IGBT. The collectors of the first and second IGBTs are connected to each other, and the emitters of the first and second IGBTs are connected to each other. The first IGBT is an IGBT type with a comparatively low collector-emitter on-voltage and a comparatively high turn-on or turn-off switching energy. In contrast thereto, the second IGBT is an IGBT type with a comparatively high collector-emitter on-voltage and a comparatively low turn-on or turn-off switching energy. Both IGBTs receive gate signals from a control circuit for switching the power switch on during a first time interval and switching the power switch off during a second time interval. The control circuit is designed to supply an on-signal to the second IGBT during the whole first time interval and another on-signal to the first IGBT during only a part of the first time interval, which is less than the whole.

The invention discloses a parameter extraction method for InP HBT small-signal models, which mainly solves the problems of the prior art, i.e. complex extraction process and inaccurate extraction results. The technical scheme of the invention is as follows: an open circuit soldering point structure and a short circuit soldering point structure are adopted to analyze an equivalent circuit to extract parasitic parameters; a collector open circuit state is adopted to analyze the equivalent circuit to extract external resistance parameters; a circuit network theory is utilized to analyze the scattering parameter S, impedance parameter Z and admittance parameter Y of the intrinsic part of an InP HBT device; and a layer-by-layer stripping method is adopted to determine a fixed expression for each intrinsic model parameter to extract intrinsic parameters. The parameter extraction method has the advantage of accurate, rapid and visual parameter extraction. A simulation result shows that a small-signal model result extracted by the method can perfectly fit the scattering parameter S of an actual device-testing result and can be used for directing circuit design and the determination of a large-signal model peripheral circuit.

The invention provides a micro intermediate infrared gas concentration monitoring method and a micro intermediate infrared gas concentration monitoring device. According to the device, a double-wavelength infrared monitoring theory is adopted, and a reasonable micro structure design is supplemented, so that a micro focal-point-free multi-reflection gas chamber is formed; a golden reflection film is plated on the inner wall of the gas chamber to enhance the reflection of infrared light, so that an infrared detector can acquire enough information for reflecting the concentration of detected gas in a tiny space. Filtration and waterproof prevention are executed through a structure consisting of a filter net and a waterproof ventilation film; the monitoring precision is guaranteed, and the gas chamber and an optical element can be protected. The device supplies a data output pin and an alarm output pin which are used for externally outputting a gas concentration digital signal and an open collector alarm signal; the device can meet the requirements for the gas concentration alarm of dangerous places. The device has digital signal processing and temperature compensation functions, has the advantages of high monitoring precision, stability, reliability and the like and can meet a requirement on the monitoring of the gas concentration in an intermediate infrared absorption region.

The invention relates to an information transmission protocol system and method based on satellite-borne electronic equipment. The invention has the benefits that: firstly, the integration of a data bus, an OC (Open Collector) signal, clock signal, an analogue signal and an I/O (Input/Output) signal on the satellite is realized, and thereby the design flow of the satellite is simplified; secondly, according to the protocol, a timing function, a plug and play function and instruction analysis and execution functions can be finished in the protocol; thirdly, powerful support for unifying a singlechip interface of equipment is provided; and various singlechips apply the same protocol and the coordination in the protocol aspect is avoided, so that the design efficiency of the satellite is greatly improved; fourthly, traditional satellite-borne data and non-data signals are classified; and corresponding data are specified and are transmitted by different data channels and non-data channels through a physical layer; and fifthly, according to the protocol designed by the invention, separate channels can be allocated for a ground testing system and special channels can be provided for diagnosing faults of the satellite during operation in orbit.

The invention relates to a water heater, in particular to a solar water heater. The solar water heater includes a main water tank, a heat collecting pipe, and a support. There is an exhaust overflow hole on the side of the main water tank. The main water tank is fixed on the support. It also includes an auxiliary water tank. A vacuum layer is formed between the tube and the outer tube, the outer tube and the inner tube, and the inner tube wall is covered with a layer of coating. Both ends of the heat collecting tube are open. to the inside of the auxiliary water tank. The double-opening and double-pass pipe design also makes the cleaning of the heat collecting pipe particularly easy, and the water inlet and outlet holes are set on the auxiliary water tank, so that the water in the water heater can be fully utilized and energy is saved.

The invention relates to a temperature control circuit for a hot knife mechanism, comprising a common-mode choke coil, a DC/DC power module, a MOS tube, an MCU, a voltage and current sampling circuit, an open-collector NAND gate, and an electric heating element. The input end of the common-mode choke coil is used for connecting a bus of an external power supply, and the output end is connected with the input end of the DC/DC power module. The positive output end of the DC/DC power module is connected with the drain of the MOS tube. The gate of the MOS tube is connected with the MCU. The electric heating element is connected between the source of the MOS tube and the negative output end of the DC/DC power module. The negative output end of the DC/DC power module is connected with the MCU through the voltage and current sampling circuit. The MCU is connected with a principal computer through the open-collector NAND gate. The temperature of the electric heating element is controlled through a closed-loop control algorithm according to the linear proportion relationship between resistance and temperature. According to the invention, a hot wire blade works in a constant-power mode, the resistance of the hot wire blade is controlled by adjusting the voltage and current of the hot wire blade, and therefore, the temperature of the hot wide blade is controlled.

The invention discloses a universal multi-channel switching value converter. Three pins of a three-pin socket connector are connected with the anode and cathode of a power module and a switching value signal respectively. The common terminal of the switching value signal is connected with the negative input end of an optocoupler by a current limiting resistor. A Pi-type filter is connected between the positive and negative input ends of the optocoupler. An open collector is arranged at the output end of the optocoupler, and is connected to 5V by a pull-up resistor. The universal multi-channelswitching value converter is highly universal, and can determine a switching value to be converted only by changing the connection statuses of the two socket connectors without changing a hardware structure. The switching value has a value of amplitude which is any value between 15V and 35V and frequency which is any value between 0MHz and 1MHz. The universal multi-channel switching value converter has a simple hardware circuit comprising basic components, does not require any dedicated chip, is low in cost and greatly improves the reliability of the whole system.

The invention discloses an LED multi-pixel-point driving system, and belongs to the technical field of LED illumination. The system comprises a power supply, a constant current driving circuit, a pixel point circuit, a plurality of switching circuits and a driving control circuit; the pixel point circuit consists of multiple LED lamps connected in series; each of the multiple switching circuits is connected to the two ends of one or more LED lamps in the pixel point circuit in parallel, and each switching circuit is also connected with the driving control circuit separately; the power supply is connected with the constant current driving circuit and the pixel point circuit in sequence, wherein each switching circuit comprises a switching MOS transistor or a switching triode or a switching device with the equivalent function; and the driving control circuit is a circuit for realizing open-circuit output of the collector of the switching triode or open-circuit output of the drain of the switching MOS transistor. The LED multi-pixel-point driving system is simple in structure and capable of greatly simplifying system scale and lowering production cost.

The invention provides an earth leakage detection circuit. A zero-phase current transformer (102) detects a ground fault current and outputs a zero-phase current. When the voltage of the zero-phase current exceeds a positive side threshold (TH1) or drops below a negative side threshold (TH2), an open collector output circuit (108) operates to discharge a capacitor (104). When the inter-plate voltage of the capacitor (104) drops below a threshold voltage (Vref), a control means (134) detects the fact as earth leakage and notifies the control section (212) of an air conditioner (200) to this effect.

The invention discloses an automatic factory test method and an automatic factory test device for a servo driver, and relates to the field of the servo driver. At present, keys of a switching value input port and a pulse value input port are detected only, and detection is easily interfered by human factors, and the servo driver cannot be detected comprehensively, so the defects of low product percent of pass, irrational parameters and large discreteness are caused. The detecting method comprises the steps of detecting a servo driver switching value input interface, detecting a servo driver switching value output interface, detecting a servo driver pulse value input interface, detecting a servo driver encoder signal output interface, and detecting a servo driver open collector output interface. An industrial personal computer and each board card which is socketed with the industrial personal computer are combined for automatically detecting the servo driver, so that the automatic factory test method and the automatic factory test device reduce the human factors, improve the detecting accuracy, reduce the labor intensity, accurately adjust the parameters, avoid adopting a special instrument for adjusting, finish the detection once, improve the detecting efficiency, simplify the detecting process and further improve the detecting efficiency.

The invention discloses a SOC chip special for an electromagnetic induction heating controller, which is internally integrated with a central processing unit (CPU), a first comparer, a second comparer, a third comparer, a fourth comparer, an operational amplifier, an Analog to Digital Converter (ADC), a programmable pulse generator, a communication interface, a state register, a counter, a NOR gate, an AND gate, an OC (open-collector) gate, a multipath switch and a latch, wherein the SOC chip is provided with a driving output end, a temperature sampling input end, a voltage sampling input end, a synchronous signal detection end, a load recoil high-voltage detection end, a surge voltage detection end and a surge current detection end. The SOC chip can be used for various electromagnetic induction heating products. After the special SOC chip is adopted, the design of the electromagnetic induction heating controller can be simplified drastically, the cost of the electromagnetic induction heating controller can be reduced and the quality and the manufacturing efficiency of the electromagnetic induction heating controller can be improved drastically.

The invention discloses a piezoelectric energy recovery device integrated with an adaptive mechanical switch. The device comprises a support base, clamps, a piezoelectric cantilever beam energy collector, an amplitude detection mechanism, a system interface circuit and an energy management unit, wherein the energy collector comprises a piezoelectric element, a cantilever beam and first masses; the amplitude detection mechanism comprises switch cantilever beams, light springs and second masses; the system interface circuit is connected with the piezoelectric element and the energy management unit through wires and connected with the first masses and contact points of the light springs through wires. SSHI (synchronized switch harvesting on inductor) technology is adopted, and defects that original electronic switches need to be controlled by additional electronic components and consume electric energy and mechanical switches cannot adapt to amplitude variation and automatically close atpositive and negative extremums of the amplitude are overcome; the device is simple and reliable in structure and has wide application prospect; energy recovery efficiency and average power of outputelectric energy are both higher than those of a common synchronous switch switching energy recovery device.

A printing apparatus having plural printing paper loading devices and a main controller. Each of the printing paper loading devices has a sub-controller to generate a test signal, and an inverting circuit of an open collector type to generate an output signal by performing an inverting operation with respect to an input signal. The printing paper loading devices are consecutively connected so that the output signal of one of the printing paper loading devices becomes the input signal input into another of the printing paper loading devices. The inverting circuit outputs a low level signal regardless of the level of the test signal when the input signal is high level, and outputs a signal of a same level as the test signal when the input signal is of the low level. Each of the sub-controllers sets its own ID based on the level of the output signal of the printing paper loading device corresponding thereto. The main controller receives the IDs set by the sub-controllers through a common bus. As the IDs of the printing paper loading devices are automatically set, a user does not have to set the IDs. In addition, malfunction of the printing apparatus caused by mistakes in setting the IDs can be prevented.

A power up-off control system of a refrigeration infrared detector comprises a command transmission link module, a temperature collection module, a filed programmable gate array (FPGA) power up-off control module, a refrigerator and a relay. According to the command transmission link module, power up-off commands are output through an open collector (OC) door transmission end, transmitted through a three-wire transport protocol, received by an optical coupling isolator and then sent to the FPGA power up-off control module. According to the temperature collection module, three independent temperature measuring circuits are utilized to measure the temperature of a focal plane of the detector, a selector gates temperature measuring results of the three temperature circuits in a time-division mode, and average deviation (AD) is input for quantification. The FPGA power up-off control module receives the power up-off control command and the temperature measurement results after the AD quantification. If the power-up command is received, the refrigerator is powered on to refrigerate the focal plane of the detector, and meanwhile the AD quantification results are compared with a temperature threshold. When at least two quantification results are lower than the temperature threshold, the relay is turned on to power up the detector. If the power-off command is received, the relay is turned off to achieve the power interruption of the detector.

An electronically commutated electric motor (110) has a permanent-magnet rotor (28), a stator having a stator winding arrangement (40), a motor control module (20) implemented as an IC and having a control logic unit (27), and an external power stage (50), separate from the IC, for influencing the current flow in the stator winding arrangement (40). The motor control module (20) has an internal power stage (29) having at least one open collector output (21, 23). The control logic unit (27) is configured to process a rotor position signal (24′, 24″) and to generate therefrom control signals (27′) for the internal power stage (29), which control signals (27′) serve to apply control to the internal power stage (29). Using an external power stage (50) reduces vulnerability to motor overheating and provides design flexibility.

The application provides a disconnection detection circuit of an incremental encoder and a connection circuit of an incremental encoder. Three detection units are respectively connected with A-phase, B-phase, and Z phase signal lines; and in each detection unit, a voltage received by a positive electrode of an input terminal is compared with a Vcp- value by a first comparison module and a voltage received by a negative electrode of the input terminal is compared with a Vcp+ value by a second comparison module. If the positive electrode of the input terminal is disconnected, the input terminal of the first comparison module receives Vee by a pull-down resistor. Because the Vcp- value is larger than the Vee, the output of the first comparison module is converted to be at a low level and thus the disconnection of the positive electrode of the input terminal of the phase signal line is represented. In a similar way, a detection result representing whether the negative electrode of the input terminal of the signal line is disconnected is obtained by the second comparison module and which phase of signal line is disconnected is detected. Moreover, disconnection detection is realized only by connection with the corresponding phase signal line and all power supplies. The disconnection detection circuit and the connection circuit can be applied to an incremental encoder of a collector open-circuit output.

The invention provides a micro far infrared type gas concentration monitoring method and device. According to the device, a dual wavelength infrared monitoring principle is adopted, a reasonable micro structure design is supplemented, a micro focus-free multiple reflection gas chamber is formed; the inner wall of the gas chamber is provided with a reflection film in a plating manner, so that the reflection on infrared light can be improved, enough information can be obtained by an infrared detector to reflect the concentration of monitored gas in a tiny space; a diaphragm and a window film are additionally arranged to converge a far infrared light source, so as to obtain far infrared light needed by measurement; the structure of a filtering net and a waterproof permeable film are adopted for performing filtering and waterproof protection, and the monitoring precision is guaranteed while the gas chamber and optical elements are also protected. The device is provided with data output pins and alarming output pins which can be used for outputting digital signals of the gas concentration and alarming signals of an open collector and is capable of meeting the demand of gas concentration alarming on hazardous occasions.

The invention provides an FPGA (field programmable gate array) based method for measuring the speed of a fan. The FPGA is internally provided with the following functional modules: a synchronization module (1), a counting module (2), a sampling module (3), a calculating module (4), a system clock module (5) and a timer module (6), wherein 250MHz clock is supplied to all the modules by the system clock module (5). Compared with the prior art, the FPGA based method for measuring the speed of the fan has the beneficial effects: according to the technical scheme, basically no additional device is added to an FPGA board card with the fan and only a signal of the fan needs to be input through an OC (open collector) gate; according to the scheme, few resources are occupied in the FPGA, thereby achieving a very practical added value function of a board card system; and an accurate result of the rotating speed of the fan can be considered as a reference for judging if a working temperature of the board card is abnormal.

Unwanted electromagnetic waves are eliminated in a frequency output circuit comprising an open-collector output terminal whereby radio noise can be reduced. A frequency output circuit 10 comprises an open-collector transistor Q4 with an open-collector output terminal connected to a pull-up resistor Rf connected to an external power supply Vex. A current limiting circuit 16 limits a current through the output terminal such that a high potential and a low potential of the output waveform of a frequency signal outputted by an output circuit 12 are smoothly switched. The current limiting circuit 16 is formed by a differential pair circuit of transistors Q1 and Q2 each with a resistor provided in the emitter thereof, and a current mirror circuit comprising an open-collector transistor, for example.

An improved circuit and method for decreasing the size and cost of switch mode power supplies is disclosed. In one illustrative example, a feedback circuit for a switch mode power supply is disclosed that includes two error amplifiers. The input of a first error amplifier is coupled to a voltage source associated with a load for the supply, and the input of a second error amplifier is coupled to a current source also associated with the load for the supply. Each one of the error amplifiers includes an adjustable shunt regulator that functions as an amplifier stage and diode. Also, the outputs of the. shunt regulators are connected together. Therefore, the shunt regulator of the first error amplifier can be used to select a voltage limit for the power supply, the shunt regulator of the second error amplifier can be used to select a current set point for the power supply, and the open collector functions of the shunt regulators serve to OR the output signals from the two error amplifiers to produce a signal indicating the loading of the supply. In this manner, an improved feedback circuit for a switch mode power supply is provided that performs the same functions as prior feedback circuits, but has at least three less discrete components (e.g., two diodes and a voltage reference) than the prior feedback circuits. Thus, the disclosed feedback circuit significantly reduces both the size and cost of switch mode power supplies.

The invention discloses a multi-valued quantizer output design and assignment method, which is characterized in that a plurality of PNP triodes Q0, Q1, Q2,...,Qn are used as output driving transistors; emitters of the Q0, Q1, Q2,...,Qn driving transistors are connected with output ends F1, F2, F3,..., Fn of a claim 5 in a patent 00105165.2, a claim 3 of 00105162.8 and a claim 4 of 00105164.4; thebases of the Q0, Q1, Q2,...,Qn driving transistors are mutually connected and are connected with the positive electrode of a reference power supply +ref; the collectors of the Q0, Q1, Q2,...,Qn form collector open circuit outputs to sequentially form OC0, OC1, OC2...OCn outputs; output end lines of OC0, OC1, OC2...OCn are arranged according to serial numbers to form a group of output line groups with continuous numbers, the continuous sequential numbers of the line group are used to calibrate the bit weight values, the weight value calibrated by a serial number and the belonging weight value of the line group position are concident, and one line group is a standard bit weight output.

The invention proposes a device for communication between a microcontroller (11) of an electronic module (10) and a microcontroller (22) of a sensor (20), the sensor being supplied with current by the electronic module (10) via a power supply line (W1), and: the electronic module comprises a control signal generator (40), which generates a control signal in modulation voltage on the power supply line, the sensor comprises a device for regulating the control signal (30), connected to the power supply line, which comprises: a high-pass filter (FPH), a voltage limiter (LT), an open collector output (CO), arranged such that the control signal at the output of the device for regulating the control signal is a voltage signal of constant mean value and included within the supply voltage window of the sensor microcontroller.

An IO interface circuit for use in a high voltage tolerant application is provided. The IO interface circuit includes a signal pad and at least a first parasitic bipolar transistor having an emitter adapted for connection to a voltage return of the interface circuit, a base adapted to receive a first control signal, and a collector connected directly to the signal pad in an open collector configuration. The interface circuit further includes a MOS control circuit coupled to the parasitic bipolar transistor and being operative to generate the first control signal. The IO interface circuit may further include an active pull-up circuit connected between a voltage supply of the interface circuit and the signal pad.