59 results about "Positive logic" patented technology

A media converter for interfacing an optical fiber bus to an electrical interface of an electronic device is described. The media converter includes an interface circuit configured to convert electrical signals received from a transmitting channel of the electrical device in a voltage doublet format to positive logic electrical pulses and convert received electrical signals for application to a receiving channel of the electrical device from positive logic electrical pulses to a voltage doublet format, a DC coupled receiver comprising an optical interface operable for receiving optical signals from the optical fiber data bus, the receiver operable for converting the optical signals to positive logic electrical pulses for application to the interface circuit, a laser diode operable to transmit optical signals onto the optical bus, and a laser diode driver operable for receiving the positive logic electrical pulses from the interface circuit and converting the electrical signals to signals compatible for operating the laser diode.

The output of a pre-decoder 10A is provided, on one side, to a main decoder 22 with the input of negative logic and on the other side, to a main decoder 21 with the input of positive logic through an inverting circuit 40. The number of gate stages from the output of the pre-decoder 10A to the output of the main decoder 21 is three which is equal to the number of gate stages from the output of the pre-decoder 10A to the output of the main decoder 22.

The invention discloses a successive approximation type analog-to-digital converter and an error code detection based digital correction method thereof. The correction method comprises steps as follows: 1) an initial value of a correction capacitor is set; 2) a digital correction logic circuit randomly acquires digital output codes of a converter; 3) the output codes are divided into two groups, namely, a group A and a group B, and the output codes are counted by 8-bit counters A and B; 4) if the overflow speed of the 8-bit counter B is higher than that of the 8-bit counter A, the correction capacitor is increased by 0.5 C; if the overflow speed of the 8-bit counter A is higher than that of the 8-bit counter B, the correction capacitor is decreased by 0.5 C; if the overflow speed of the 8-bit counter B is equal to that of the 8-bit counter A, the value of the correction capacitor is unchanged; 5) after Step 4) is finished, the digital correction logic circuit clears the 8-bit counters A and B, and Steps 2)-4) are repeated. According to the correction method, the specific correction process and the conversion process of the successive approximation type analog-to-digital converter are conducted synchronously, no additional correction period or correction time is required, real-time response can be made to PVT change, and the method has the advantage of capability of realizing real-time correction.

The present invention relates to a redundancy switching control method and its circuit. Said method includes the following steps: detecting that logical object A of positive logic state produces abnormal state and notifying it to another logical object B; according to the failure extent of self-body another logical object B can define logical state; according to the logical state of logical object B logical object A can make failure extent comparison, and again define logical state of self-body; according to the requirement repeating the above-mentioned steps until the logical object with lighter failure extent can be defined into positive logical state. The correspondent control circuit includes a group of AND-NOT circuits and processor, said AND-NOT circuits are respectively correspondent to logical objects, have three input ends; first input end is used for transferring control signal; second input end is used for transferring reset signal; and third input end is used for transferring state signal, and is connected with output end of relative logical object and illogical circuit.

The invention discloses a gateway of an internet of things for implementing long-term operation in an environment without electricity and an implementation method. The gateway of the internet of things is used for receiving and transmitting acquired data of different sets of sensing equipment at a front end and comprises a microcontroller, a built-in power supply module, a reset crystal oscillator module and a communication interface module, wherein the built-in power supply module is used for supplying electricity; the reset crystal oscillator module comprises a crystal oscillator chip, a programmable frequency divider and a reset module; the crystal oscillator chip and the programmable frequency divider are used for acquiring a frequency of positive logic inputting by using a reference frequency pin of the crystal oscillator chip, and converting an output frequency into a low-frequency signal which is required by a preset clock by using a frequency dividing ratio and is used for providing a clock signal for the microcontroller regularly or in an event-triggered mode; the reset module is used for triggering the gateway to be reset; and the microcontroller is connected to the built-in power supply module and the reset crystal oscillator module respectively, and is used for receiving data and transmitting data to a back end interface through the communication interface module after being waken by the reset crystal oscillator module and then stopping working to enter a dormant state. By a timed uploading function of the gateway, the electricity quantity of a built-in battery can be used to the maximum extent to ensure that gateway equipment can work as long as possible, and the gateway can play an important role in particular environments and occasions with special requirements such as agriculture and forestry, mines and the like.

The invention relates to a bidirectional shift register which can make the same of output signal pulse widths when it is formed by positive logic or passive logic, wherein the data line driving circuit (200) has multistage shift register unit circuit (A) which has the first and second transmission gates (201, 202) for synchronously transmitting the pulse STX with the X clock signal XCK and the reversed X clock signal XCKB; the first logic circuit (203) for reversed outputting input signal; and the first and second clock-control inverters (204, 205) for making the logic potential of transmission direction control signal DIR effective; the output of first logic circuit (203) is connected to the input of inverters (204, 205) whose outputs are connected to the input of first logic circuit (203) via the transmission doors (201, 202).

In order to reduce crosstalk caused between control signal wires in a semiconductor apparatus without increasing the size of the semiconductor apparatus, a noise guard circuit is provided at the opposite end of the control signal wire to the driver circuit. The noise guard circuit controls in such a way as to increase the impedance between the relevant control signal wire and a fixed potential when the logic of the relevant control signal wire is positive logic for driving the element, and as to decrease the impedance between the relevant control signal wire and a fixed potential when the logic of the relevant control signal wire is negative logic for driving the element.

The invention discloses an automatic test system for model test displacement data and a test method thereof. The automatic test system comprises a displacement transfer unit, a displacement measurement unit, a signal conversion unit, a data processing unit and a visualized human computer interaction interface system, wherein the displacement transfer unit is connected with a model; when the model body displaces, the displacement measurement unit outputs pulse signals of which the pulse number is in proportion to displacement amount; after the output pulse signals are received, processed and converted into an identifiable positive logic signal by the signal conversion unit, the identifiable positive logic signal is transmitted to the signal processing unit; the signal processing unit calculates the number of the pulse to calculate model displacement; and the model displacement is finally stored and displayed on the visualized human computer interaction interface system to automatically generate a model displacement time interval curve for testers to dynamically observe and monitor model displacement in real time. According to the automatic test system for model test displacement data and the test method thereof, the digitization, the visualization and the intellectualization of the automatic measurement of the model displacement in the underground engineering model test in the fields of hydropower, traffic, energy, resource and defence construction fields can be realized.

The invention discloses a successive approximation type analog-to-digital converter with a capacitor mismatch correction function. The circuit is provided with a P-end DAC (102), an N-end DAC (104), acomparator (106), an SAR logic circuit (108), a correction logic circuit (110) and a correction control circuit (112). The output end of the P-end DAC (102) and the output end of the N-end DAC (104)are respectively connected with two input ends of the comparator (106). Wherein the output of the comparator (106) is connected with the SAR logic circuit (108); the SAR logic circuit (108) is in control connection with the P-end DAC (102), the N-end DAC (104) and the correction logic circuit (110); and the correction control circuit (112) is in control connection with the SAR logic circuit (108)and the correction logic circuit (110).

The invention discloses a method, equipment and a system for processing an active detection response. The method comprises the following steps: current equipment receives an active detection request from remote equipment, obtains an IP (internet protocol) address of the remote equipment and obtains the positive logic active detection response corresponding to the active detection request; the current equipment judges whether the IP address is within an IP address credible region range or not; if the IP address is within the IP address credible region range, the current equipment sends the positive logic active detection response to the remote equipment; if the IP address is not within the IP address credible region range, the current equipment performs negative logic treatment on the positive logic active detection response, obtains a negative logic active detection response and sends the negative logic active detection response to the remote equipment. According to the embodiment of the invention, an attacker can be prevented from mining key network data from the active detection response, so that an attack behavior cannot be made, the network security is improved, and insecurity, information leakage and the like caused by positive logic are avoided.

The invention discloses a single-power-supply positive and negative logic conversion circuit, which comprises a power supply, a zero level, a positive logic input, a control circuit and a negative logic output, wherein the power supply only comprises a negative power supply; the control circuit comprises a voltage reducing module and a control module; the voltage reducing module comprises an MOS (Metal Oxide Semiconductor) tube voltage reducing module and an enabling control module; the output end of the MOS tube voltage reducing module is connected with a reshaping and amplifying circuit through a signal; the MOS tube voltage reducing module is formed by connecting a plurality of NMOS (N-channel Metal Oxide Semiconductor) tubes in series; the enabling control module consists of one NMOS tube; the input end of the MOS tube voltage reducing module is connected with the positive logic input; the output end of the MOS tube voltage reducing module is connected with the input end of the enabling control module and an internal negative logic signal; the output end of the enabling control module is connected with a negative level; and the internal negative logic signal is connected with the input end of the control module. The single-power-supply positive and negative logic conversion circuit has the advantages that: only a single power supply is required for supplying power, the chip cost and the wiring difficulty and cost of a power wire are reduced, and the entire logic conversion circuit is relatively simple.

The invention relates to a negative-logical IGBT/MOSFET driving circuit, driving system and driving method, and an air conditioner. The negative-logical IGBT/MOSFET driving circuit comprises two stages of driving circuits, i.e., a first stage of driving circuit and a second stage of driving circuit; the first stage of driving circuit is used for converting the I/O driving level of a low voltage MCU into a specific driving level, and the second stage of driving circuit is used for ensuring the saturation conduction of a driving object IGBT/MOSFET. According to the invention, a cheap and general two-stage triode replaces a routine special-purpose integrated driving IC to control a high current IGBT/MOSFET, thereby reducing the manufacture cost and risk of a control circuit designer under the condition of not changing original performances; in addition, compared with a positive logic driving circuit, the negative-logical driving circuit can greatly reduce material costs and the dependence on a provider under the condition of not changing original performances, thereby enhancing the competitive power of a control circuit provider.

Positive logic circuits, systems and methods using MOSFETs operated in a depletion-mode, including electrostatic discharge protection circuits (ESD), non-inverting latches and buffers, and one-to-three transistor static random access memory cells. These novel circuits supplement enhancement-mode MOSFET technology and are also intended to improve the reliability of the complementary metal-oxide-semiconductor (CMOS) integrated circuit (IC) products.

A CMOS logic circuit is disclosed wherein the number of kinds of basic parts is suppressed to five to allow designing of a circuit which operates at a high speed and repetitiveness of wiring lines is increased to allow designing of a circuit which is simple in circuit scale and high in expandability and besides the time required for adjustment of components is reduced significantly to reduce the man-hours for arrangement significantly to reduce the man-hours for development significantly and the same basic parts are used so as to achieve augmentation of the yield and promote reduction of the production cost. A basic cell of the CMOS logic circuit includes a first inversion section for inverting a first input signal having one of positive logic and negative logic and outputting the inverted signal, a second inversion section for inverting a second input signal having the other of the positive logic and the negative logic and outputting the inverted signal, and a transmission section for selectively outputting one of the output of the first inversion section and the output of the second inversion section in accordance with a logical value which depends upon an externally controllable selection signal and an inverted signal of the selection signal.

The invention discloses a software upgrading circuit module. The invention spurns the traditional serial port software upgrading mode, uses the parallel port upgrading mode, uses the I/O port with parallel 25 pins of computer to simulate the IIC bus, uses the control circuit of software upgrading circuit module to realize the switch from the positive logic bus data signal to the passive logic bus data signal, and uses the IIC bus of VGA or DVI plug of TV set to realize the communication between the main processing chips of the computer and TV set, so the writing program in parallel mode by controlling the FLASH chip is easy, while the upgrading speed of software and the producing efficiency are improved. The inventive software upgrading circuit module has simply design and high practicality. In addition, by setting the jump device of said module, any one of TV plugs can be selected to upgrade, so the versatility of said system is guaranteed.

An output end and an inverted output end of a latch circuit that is connected to an output buffer circuit are switched with each other, and thereby, the relationship between the data of “0” or “1” and the drain of a memory cell is connected or not connected to a bit line is changed. In addition, an input of a sense amplifier is fixed at the grounding potential by means of a test control signal, and thereby, positive logic is confirmed in the case where the output of the output buffer circuit is “L,” and negative logic is confirmed in the case where the output of the output buffer circuit is “H.”

The invention provides a positive logic enabling power-on control circuit of a power supply module. The positive logic enabling power-on control circuit comprises a diode circuit, a photoelectric isolation coupler, and a zone conduction control circuit. The positive terminal of the diode circuit is connected with an enabling terminal of a power supply module and the negative terminal of the diode circuit is connected with an input negative terminal of the power supply module. A collector of a triode of the photoelectric isolation coupler receives an input voltage and an emitter of the triode is connected with the negative terminal of the diode circuit. The zone conduction control circuit receiving a monitoring voltage of a monitored power supply is used for controlling a light-emitting diode of the photoelectric isolation coupler to be in conduction when the monitoring voltage exceeds a lower limit voltage and does not exceed an upper limit voltage, so that the triode of the photoelectric isolation coupler is in conduction and thus the enabling terminal of the power supply module is disconnected with the input negative terminal and the power supply module outputs the voltage. When the monitoring voltage exceeds the upper limit voltage, the zone conduction control circuit controls the light-emitting diode of the photoelectric isolation coupler to be cut off, so that the triode of the photoelectric isolation coupler is cut off and thus the enabling terminal of the power supply module is connected with the input negative terminal and the power supply module does not output the voltage. Therefore, the load damage resulted from power-on operation can be prevented.