28 results about "Pull-up resistor" patented technology

This invention discloses an interface power supply circuit and a terminal. The circuit includes: a VBUS power network for a USB connector, a PMOS transistor VT2, an NMOS transistor Q3, an NMOS transistor Q1, and an NMOS transistor Q2. The VBUS power network is connected to the source of the PMOS transistor VT2. The control terminal of the PMOS transistor VT2 is connected to the drain of both the NMOS transistor Q3 and the NMOS transistor Q1. A resistor R1 is connected in parallel between the source and drain of the PMOS transistor VT2. The drain of the PMOS transistor VT2 is connected to the terminal's system power supply VDD_5V to supply power to the terminal's VCC_IN power supply. The drain of the NMOS transistor Q1 is connected to the VBUS power network via a pull-up resistor R1. The control terminal of the NMOS transistor Q1 is connected to the drain of the NMOS transistor Q2. The source of the NMOS transistor Q1 is connected to the GND ground terminal. This provides a more stable interface power supply solution, improving the operational stability of the terminal and enhancing the user experience.

A kind of control loop pulse width adjustable timer locking circuit and method, the circuit includes working power supply, first, second 555 timer chip U1, U2, three input or gate chip U3 and button switch S1;The power supply pin of working power supply VCC is connected to two 555 timers and three input or gate chip, the 2 number trigger pin of U1, U2 is connected;The 3 number output pin of U1, U2 and the pin of button switch S1 are respectively connected to the input end of U3, the output end of U3 is connected to the 2 number trigger pin of U1, U2, and is connected to VCC with a pull-up resistor R1, the other end of S1 is grounded;And the pulse width of U1 is less than U2.The control loop pulse width adjustable timer locking circuit and method of the present application can accurately modulate the test jump pulse width of control loop, and can only trigger once within a certain time, to avoid multiple triggers leading to undesirable consequences, effectively guarantee the stability of load control system.

A phase-locked loop circuit includes a phase-frequency detector circuit, a time amplifier circuit, a control circuit, and a variable oscillator circuit, such as a voltage-controlled oscillator. The phase-frequency detector is configured to generate a phase error output indicating a phase difference between a reference signal and a feedback signal generated using an output signal. The time amplifier is configured to extend the phase difference to generate an extended phase error output. The variable oscillator is configured to use one or more control signals generated by the control circuit using the extended phase error to adjust a frequency of the output signal. The control circuit may generate a proportional control signal using a switched-resistor circuit that includes a pull-up resistor and a pull-down resistor. The control circuit may generate an integral control signal using a capacitive-shared-integration circuit that includes passive integrating components.

The utility model provides a kind of tubular motor mechanical resistance rebound control circuit, including circuit board and motor, and is equipped with main control module, power module, motor drive module on circuit board, motor drive module includes motor interface, and the middle shaft of motor is equipped with bump block, and microswitch matched with bump block is set on circuit board, and the trigger signal of microswitch is output by motor interface, and power module is for motor, main control module and motor drive module power supply, still include resistance detection filter circuit, resistance detection filter circuit includes diode D1 and photoelectric coupler OP1, the positive pole of diode D1 is connected with the trigger signal output by motor interface, and the negative pole of diode D1 is connected with the input end of photoelectric coupler OP1 with RC filter circuit, the collector of the output end of photoelectric coupler OP1 is connected with the output end of power module by pull-up resistor R4, the collector of the output end of photoelectric coupler OP1 is connected with the signal input end of main control module, and the emitter of the output end of photoelectric coupler OP1 is grounded.

The utility model discloses a kind of multistage drive circuit of power switch module, motor controller and vehicle, it includes drive isolation module, power module, 3n pull-up resistors, 3n current-limiting resistors, 12m voltage divider and the number of gate of power switch module equal pull-down resistor, power module is connected with the 3n output end of MCU by 3n pull-up resistors, the 3n input end of drive isolation module is connected with the 3n output end of MCU by 3n current-limiting resistors, the 12m output end of drive isolation module is connected with the gate of power switch module and pull-down resistor by 12m voltage divider. Using the utility model can realize multistage drive current regulation, it is favorable to reduce switching loss, improve the working efficiency of motor controller.

Provided is a household gas pipeline valve closed state monitoring alarm device, comprising a capacitive sensor for detecting the communication position and the disconnected position of the gas pipeline valve, the output end of the capacitive sensor being connected to the same-phase input end of a voltage comparator through an RC charging / discharging circuit, and the output end of an adjustable potentiometer being connected to the reverse input end of the voltage comparator, one output end of the voltage comparator being connected to one end of a pull-up resistor and the other end of the pull-up resistor being connected to a power supply, the other output end of the voltage comparator being connected to the input end of a triode switching circuit, and the output end of the triode switching circuit being connected to an alarm loop. The utility model solves the problem of gas safety accidents caused by gas leakage due to forgetting to close or not closing the gas valve, adjusts the circuit power supply state and voltage comparison parameters according to the actual use scene, and adapts to the monitoring requirements of different household gas pipeline valves.

To enable detection of a break in the ground fault detection circuit that occurs during the output operation of the output circuit. [Solution] A ground fault detection device connected to an output circuit insulated from the earth, comprising: a midpoint resistor provided between a pair of output lines of the output circuit; a ground fault detection resistor provided between the midpoint resistor and the earth; an amplifier having a + input terminal connected to one end of the ground fault detection resistor and a - input terminal connected to the other end of the ground fault detection resistor; a pull-up resistor provided between one end of the ground fault detection resistor and the + input terminal of the amplifier and connected to a positive power supply voltage; a pull-down resistor provided between the other end of the ground fault detection resistor and the - input terminal of the amplifier and connected to a negative power supply voltage; and a disconnection detection unit that detects the disconnection of the ground fault detection resistor by detecting that the ground fault detection resistor is disconnected and that the positive power supply voltage and the negative power supply voltage are input to the input terminal of the amplifier via the pull-up resistor and the pull-down resistor.

The application discloses an improved upper and lower power time slot protection circuit of a GaN device, which comprises a gate protection circuit and a drain time slot upper and lower power switch circuit, the gate protection circuit comprises a power supply voltage, a gate negative voltage generating circuit and a diode, the positive electrode end of the diode is connected with the gate negative voltage generating circuit and the gate of the GaN device at the same time, the other end is grounded, the gate negative voltage generating circuit is connected with the drain time slot upper and lower power switch circuit through a voltage stabilizing diode, the negative electrode of the voltage stabilizing diode is connected with the power supply voltage through a first pull-up resistor, the drain time slot upper and lower power switch circuit is connected with the drain of the GaN device, and the power supply voltage is connected with the gate negative voltage generating circuit and the drain time slot upper and lower power switch circuit. The device gate is prevented from being broken down and overvoltage, in addition, when the gate appears a higher negative voltage, the drain voltage is turned off, and the device damage caused by the misoperation when setting the device gate voltage is avoided.

The utility model discloses a kind of automobile seat motor current type hall matching circuit, cooperate with hall sensor, it is characterized in that, including signal input and ESD protection module, level matching module, signal conversion module and output MCU module, the signal input and ESD protection module input set hall sensor signal and carry out electrostatic protection, output to the level matching module, the level matching module is matched by single pull-up resistor and the internal resistance of hall sensor, the level of hall sensor is judged and output to the signal conversion module, the voltage variation of hall sensor is converted into conducting signal by the signal conversion module, after signal shaping, output to MCU by output MCU module, circuit composition structure is simple, easy to realize.

In a communication device for a gas appliance using a control device having input terminals, control terminals, and output terminals, the present invention provides a technology that enables the output of an output signal corresponding to an input signal without independently providing a control signal to the control terminal. [Solution] The hot water heater 1 comprises a hot water supply circuit 2 and a control device 92 having a control terminal DE to which a control signal consisting of a high-level transmit permission signal or a low-level transmit disallowance signal is input. The control device 92 comprises a voltage conversion circuit 91 connected between the input terminal DI and the control terminal DE. The voltage conversion circuit 91 converts the control signal input to the control terminal DE to a low level when the input signal input to the input terminal DI is high level, and converts the control signal input to the control terminal DE to a high level when the input signal input to the input terminal DI is low level. The device also comprises a pull-up resistor RPU connected between the power line BL and the output line LO.

Embodiments of the present application provide a connection state determination method and device, a chip, a medium and a program product. The chip includes an input-output pin, a plurality of pull-up resistors, a plurality of pull-down resistors, a switch tube corresponding to each pull-up resistor, and a switch tube corresponding to each pull-down resistor. The input-output pin is connected to a power supply through the switch tube corresponding to each pull-up resistor and the pull-up resistor. The input-output pin is connected to the ground through the switch tube corresponding to each pull-down resistor and the pull-down resistor. The method includes: obtaining current voltage signals corresponding to a plurality of configuration information; the current voltage signal is a voltage signal of the input-output pin under the condition that the on-off state of each switch tube is controlled based on the configuration information; the target on-off state of each switch tube indicated by different configuration information is different; and determining the connection state according to a preset voltage signal and the current voltage signals corresponding to the plurality of configuration information. In this way, the single input-output pin can be used to detect the connection state of the chip and the external device.

The present disclosure provides a kind of maintenance-free temperature measurement alarm circuit and maintenance-free spoon.The above-mentioned circuit includes power supply module and temperature measurement module;Power supply module includes power supply battery and first high-temperature fuse, the positive pole of power supply battery is connected with the first end of first high-temperature fuse, the negative pole of power supply battery is grounded;Temperature measurement module includes high-temperature detector, temperature measurement pull-up resistor and temperature measurement thermistor, the power supply end of high-temperature detector is connected with the second end of first high-temperature fuse;The second end of temperature measurement pull-up resistor is connected with the first end of temperature measurement thermistor, the second end of temperature measurement thermistor is grounded, the temperature measurement sampling end of high-temperature detector is connected with the first end of temperature measurement thermistor.In disinfection, temperature measurement thermistor collects disinfection temperature, high-temperature detector detects and judges disinfection temperature, each component in the circuit belongs to high-temperature component, avoids the condition of damage, improves its high-temperature performance.

The application belongs to the technical field of semiconductor chip testing, and particularly relates to a test matrix instant stop method based on target result triggering, which is suitable for a test matrix scene, and realizes instant termination of a test process by relying on a preset hardware signal line designed by connecting a pull-up resistor to Vcc and comprises the following steps: S1, a pre-test configuration stage, S2, a test matrix preparation execution stage, S3, a test matrix execution stage, and S4, an instant stop stage. A flexible configuration mechanism of test target event registration and stop event binding is constructed, and a special hardware signal line of connecting a pull-up resistor to Vcc is matched to realize global synchronous triggering and stopping across a board card, the traditional fixed sequence test mode is abandoned, and the core problems of executing redundant test items after a test target is achieved in the prior art, causing invalid consumption of test time and equipment resources, and lacking of unified synchronous stopping capability in multi-board card cooperative testing and high parallel / multi-station test period being greatly lengthened are solved.

This invention relates to the field of power sharing technology, and discloses a power sharing method and apparatus. The method involves connecting a DDR3 detection signal line to the ground contact of the DDR3 slot on the motherboard. A pull-up resistor pulls the DDR3 detection signal line to a high level, controlling the first transistor to conduct and the second transistor to cut off. With the second transistor off, the power supply chip outputs a DDR4 operating voltage. When a DDR3 memory module is inserted into the DDR3 slot, the ground pin of the DDR3 memory module pulls the DDR3 detection signal line to a low level, controlling the first transistor to cut off and driving the second transistor to conduct. With the second transistor on, a voltage divider network is switched to allow the power supply chip to output a DDR3 operating voltage to supply the DDR3 memory module. This invention employs a safety strategy of defaulting to a low voltage and only boosting the voltage when DDR3 is detected, effectively avoiding the risk of high-voltage damage due to misoperation or incorrect insertion, and protecting expensive memory hardware.

The application relates to a switch circuit capable of driving a large current. The switch circuit capable of driving a large current comprises an input module, a control module and a protection module, the input module comprises a current limiting unit and a pull-up resistor R16, the current limiting unit is electrically connected with the first end of the pull-up resistor R16; the control module comprises a PMOS tube Q9 and a PMOS tube Q8, the PMOS tube Q9 is electrically connected with the first end and the second end of the pull-up resistor R16 respectively, and the PMOS tube Q8 is electrically connected with the PMOS tube Q9; and the protection module is electrically connected with the PMOS tube Q9 and the PMOS tube Q8 respectively. The scheme provided by the application can improve the load current capacity, so that a large-power load can be driven.

A bidirectional signal conversion circuit is used to perform signal conversion between a first port and a second port, and includes a switch, a first pull-up resistor, a second pull-up resistor, a first output response enhancement circuit and a second output response enhancement circuit. The switch is coupled between the first port and the second port, and operates according to a bias voltage. The first pull-up resistor is coupled between the first port and a high voltage terminal. The second pull-up resistor is coupled between the second port and a low voltage terminal. The first output response enhancement circuit includes a first AC coupling circuit and a first output stage circuit, and is capable of accelerating the transient response of an output port when the first port and the second port are respectively used as an input port and an output port. The second output response enhancement circuit includes a second AC coupling circuit and a second output stage circuit, and is capable of accelerating the transient response of the output port when the second port and the first port are respectively used as the input port and the output port.

This utility model discloses an adjustable current-limiting digital signal output circuit, including an input power supply VCC, a voltage divider network, transistor switches, a filter capacitor, an MCU control module, and an output terminal OUT. The input power supply VCC provides energy to the entire circuit. The transistor switches include transistors Q1, Q2, and Q3. The filter capacitor suppresses noise and stabilizes the voltage. The MCU control module includes a microcontroller enable signal MCU_EN and a power ground GND. The voltage divider network includes a current-limiting resistor, a voltage-dividing resistor, and a pull-up resistor. The current-limiting resistor adjusts the current limit by changing its resistance value, the voltage-dividing resistor adjusts the transistor voltage, and the pull-up resistor ensures the transistor conducts when the microcontroller enable signal MCU_EN is valid. The output terminal OUT is located at the circuit's output port. Thus, short-circuit protection is achieved through a simple transistor and resistor-capacitor circuit. The circuit is simple, reliable, requires few components, is cost-effective, and is less prone to failure.

The application provides a fan control method and system, comprising the following steps: S1, detecting the pull-up resistance of the ALERT pin and the FANFAIL pin during power-on and the clock generation circuit, and obtaining the period and duty cycle of the fan PWM signal during power-on according to the resistance value; S2, waiting for the host computer to configure the FanDCYReg register, and being in the initial state if the FanDCYReg register is not configured; S3, after the host computer configures the FanDCYReg register, the duty cycle of the fan PWM signal is determined by the FanDCYReg register, and the period is determined by the PWMFreqReg register, and the state is the normal state; S4, monitoring whether the heartbeat line of the host computer is abnormal, and if the heartbeat line is abnormal, the fan drive control mode is switched to the takeover state, otherwise, the state is the normal state; meanwhile, the pulse counting circuit directly gives the RPM speed value of the fan, and the bit width is 16, and the division operation of the host computer is not needed. The application can provide the speed RPM of the fan in real time, reduce the software resource cost of the host computer, reduce the cable between the fan and the host computer, and reduce the system cost.

This invention discloses a circuit, method, and mobile device for detecting the grounding connection status of a mobile device casing, belonging to the field of electronic device testing technology. To address the problems of low efficiency, high cost, and difficulty in automation of existing detection methods, this invention provides two core circuits: a series resistor network scheme that connects multiple grounding connection points to the nodes of a resistor string, determining an open circuit at any point by measuring whether the voltage at the end jumps from near zero to the test voltage; and a digital logic scheme that connects to a microcontroller's GPIO via pull-up resistors, directly reading the level status of each point for independent judgment and location. The corresponding detection method includes steps of applying a test signal, reading the response electrical signal, and determining the status based on signal characteristics. This invention transforms the physical state of multiple mechanical connections into changes in a single or set of electrical signals, achieving rapid, automated, and low-cost online detection, and can assist in fault location, significantly improving production quality inspection efficiency and product reliability.

The present application can detect a disconnection of a ground fault detection circuit generated during output operation of an output circuit. A ground fault detection device connected to an output circuit insulated from the ground, the ground fault detection device comprising: a midpoint resistor provided between a pair of output lines of the output circuit; a ground fault detection resistor provided between the midpoint resistor and the ground; an amplifier having a + input terminal connected to one end of the ground fault detection resistor and a - input terminal connected to the other end of the ground fault detection resistor; a pull-up resistor provided between the one end of the ground fault detection resistor and the + input terminal of the amplifier and connected to a positive power supply voltage; a pull-down resistor provided between the other end of the ground fault detection resistor and the - input terminal of the amplifier and connected to a negative power supply voltage; and a disconnection detection unit that detects a disconnection of the ground fault detection resistor.

This utility model relates to the field of PWM signal input technology for brushless electronic fans, and discloses a PWM signal input circuit for low-side drive, including a reference voltage generation unit, a comparison unit, a filtering unit, a current limiting unit, a pull-up resistor R1, and a low-pass filter. In actual use, the PWM signal is filtered by the filtering unit and current limited by the current limiting unit before being input to one input terminal of the comparison unit. The comparison unit compares the signals input to its two input terminals and outputs the signal, which is then filtered by the low-pass filter before being output. This replaces the traditional integrated circuit for inputting the PWM signal to the control unit. The entire circuit has a simple structure, low cost, and uses common components, eliminating procurement cycle limitations.

The utility model discloses a kind of wake-up circuit and communication module, it is related to battery management technical field, wherein, wake-up circuit includes first switch unit, second switch unit, first switch unit includes first PMOS pipe, first PMOS pipe includes first grid, first source, first drain, first pull-up resistance;Second switch unit includes second PMOS pipe, and second PMOS pipe includes second grid, second source, second drain and second pull-up resistance.The utility model's circuit can make battery management system after entering dormancy for a period of time, realize again wake-up function, reduce power consumption, reduce cost.

This invention discloses a circuit structure for ESD protection of an LCD, including an LCD module and a circuit board electrically connected to the LCD module. The circuit board includes a reset potential stabilization unit electrically connected to the RES reset pin of the LCD module and a power surge protection unit electrically connected to the power supply terminal. The reset potential stabilization unit and the power surge protection unit cooperate to achieve ESD protection for the LCD. The reset potential stabilization unit includes a pull-up resistor, with its first end electrically connected to the power supply terminal and its second end electrically connected to the RES reset pin. The power surge protection unit includes at least one TVS diode connected in parallel between the power supply terminal and ground. This invention can stabilize the RES reset pin level and reduce ESD sensitivity, discharge ESD surges at the power supply terminal, and achieve ESD protection through the cooperation of two units. The circuit is extremely simple and has low modification costs.

The application discloses a calibration circuit, a chip and an electronic device. The calibration circuit comprises a target sub-circuit, and is used for calibrating a target chip comprising a to-be-calibrated pull-up resistor module and a to-be-calibrated pull-down resistor module. The target sub-circuit comprises a comparison module and a pull-up resistor module with adjustable resistance. The target sub-circuit has a first state and a second state. When the target sub-circuit is in the first state, first input ends of the comparison module are electrically connected with the target resistor and the pull-up resistor module respectively. When the target sub-circuit is in the second state, the first input ends of the comparison module are electrically connected with the to-be-calibrated pull-up resistor module and the to-be-calibrated pull-down resistor module respectively. A second input end of the comparison module is used for inputting a reference voltage. In this way, the to-be-calibrated pull-up resistor module and the to-be-calibrated pull-down resistor module in the target chip can be calibrated by the calibration circuit, so as to eliminate the drift generated in the chip as much as possible, reduce the probability of impedance mismatch, and improve the performance of the chip.

This invention discloses a circuit for improving the frequency modulation resolution of a laser, belonging to the field of laser temperature control. At the output control terminal of a DAC, operational amplifier U2 is used to increase the output voltage, and a voltage divider network is used to control the DAC output voltage within a certain range. At the feedback terminal of the thermistor RT, operational amplifier U1 controls the feedback voltage of the thermistor RT to be consistent with the range of the DAC output voltage. It mainly includes operational amplifiers U1 and U2. The non-inverting input terminal of operational amplifier U2 is connected to the DAC output terminal through resistor R10, and the output terminal of operational amplifier U2 is connected to a TEC temperature control chip through a voltage divider network. The non-inverting input terminal of operational amplifier U1 is connected to the thermistor RT, which is also connected to an RC filter and a pull-up resistor R3. This invention is mainly used to improve the frequency modulation resolution of a laser.

A display apparatus includes a display panel including a data line, first through nth data driving integrated circuits (ICs) (where n is a natural number greater than 1) that supply a data voltage to the data line, a controller that controls the first through nth data driving ICs, and a power supply that supplies power to the first through nth data driving ICs. The first data driving IC includes a lock signal switching unit that receives or blocks a lock signal from the power supply, a pull-up resistor is provided between a second data driving IC and a lock signal line to which the lock signal is supplied from the power supply, and the lock signal supplied to the first data driving IC or the second data driving IC is transmitted to the controller through the first through nth data driving ICs.

An electrical assembly includes a controller, a voltage tracker component, a clamp protection circuit, a plurality of analog inputs, and a plurality of pullups. The voltage tracker component may be electrically coupled to a battery. The clamp protection circuit may be electrically coupled between the voltage tracker component and the plurality of analog inputs. The plurality of pullups may be electrically coupled between the plurality of analog inputs and the clamp protection circuit. The clamp protection circuit may control power to the plurality of pullups and may provide a low impedance drain path for a short-circuit current from at least one analog input of the plurality of analog inputs.