39 results about "External resistor" patented technology

This invention provides a pulse voltage regulation circuit, comprising: a pulse control module and a reference voltage regulation module; the pulse control module is used to generate a set of M switching control signals according to the number of continuously input pulse signals; the reference voltage regulation module is connected to the output terminal of the pulse control module and is used to select a resistor voltage division ratio according to the M switching control signals, and to divide the bandgap voltage according to the selected resistor voltage division ratio to generate a reference voltage output; wherein, M = 2 N N is an integer greater than or equal to 1. The pulse voltage regulation circuit provided by this invention solves the problem of existing voltage regulation schemes adjusting the output voltage by changing the resistance value of external resistors.

The invention provides a transformer residual magnetism detection method for improving direct current demagnetization, and belongs to the technical field of power equipment detection. The method comprises the following steps: demagnetizing a transformer iron core to eliminate an interference magnetic field, applying direct current excitation through a special winding to generate controllable preset residual magnetism, establishing a detection circuit in which a primary side winding is connected with an external resistor in series and a secondary side winding is open-circuited, and sequentially applying direct current small signal excitation with the same size and opposite directions, the method comprises the following steps: collecting forward and reverse transient current and voltage waveforms, comparing current change rate after filtering to judge the residual magnetism direction, solving the equivalent resistance of an iron core based on the waveform consistent with the residual magnetism direction, obtaining a detection result by combining the monotone fitting relationship between the resistance and residual magnetism, and finally assisting verification and calculating a relative error through an energy method. And if the error does not exceed 5%, it is determined that detection is effective, accurate and lossless detection of the magnitude and direction of the residual magnetism can be achieved, and detection reliability and engineering applicability are effectively improved.

Techniques for controlling the programming current of a PCM-based AI device using an external resistor are provided. In one aspect, a PCM cell includes: a PCM stack, that has a bottom electrode; a heater disposed directly on the bottom electrode; a PCM unit including a first material disposed on the heater; a top electrode including a second material disposed on the PCM unit; and a resistor adjacent to the PCM stack, wherein the resistor includes a combination of the first material and the second material. A PCM device that includes at least one of the PCM cells, and a method of forming the PCM cell are also provided.

This invention provides a threshold voltage adjustment circuit that allows for easy adjustment of the threshold voltage. [Solution] The threshold voltage adjustment circuit 10 includes a reference current circuit 20 and a transimpedance circuit 30. The reference current circuit 20 outputs a reference current formed on the substrate. The transimpedance circuit 30 has multiple resistors on the substrate and the threshold voltage V is expressed as a function of the combined resistance of the multiple resistors and external resistors and the reference current. TH Outputs.

This invention provides an electronic detonator chip and module. The chip includes a digital control logic circuit, a ignition control signal drive circuit, an internal bias resistor, a voltage detection and comparison circuit, and a bypass discharge switch. By setting the internal bias resistor to be greater than the corresponding external resistor, when the GND or VCHG pins are loosely connected, the voltage difference is mainly distributed across the internal resistor, ensuring that the gate voltage of the ignition switch is lower than its conduction threshold, preventing false triggering. The voltage detection and comparison circuit monitors the ignition control pin potential in real time during non-ignition states. Once an abnormal voltage caused by external interference is detected, it immediately controls the bypass discharge switch to conduct, safely discharging the energy from the energy storage capacitor and preventing false ignition. This invention provides corresponding embodiments for both NMOS and PMOS ignition switches, effectively solving the problem of premature detonation caused by loose pin connections and external interference, significantly improving the safety of electronic detonators.

The utility model discloses an integrated power module with shunt resistors, which comprises a power substrate, a plurality of IGBTs (Insulated Gate Bipolar Translator), shunt resistors and diodes are welded on the power substrate, one end of one shunt resistor is correspondingly connected with an emitter of one IGBT and an anode of one diode, the other end of the shunt resistor is grounded, and a cathode of the diode is connected with a collector of the IGBT; when overcurrent occurs in the circuit, a current signal is transmitted to the shunt resistor, and when the shunt resistor detects that the current is too large, a gate drive signal of the IGBT is turned off immediately so as to turn off the IGBT; according to the utility model, the connection mode of a traditional IGBT external resistor is optimized, and the shunt resistor and the IGBT are directly welded on the same power substrate together, so that the distance between the shunt resistor and the IGBT is closer, the current signal circulation paths are reduced, the shunt resistor can rapidly detect overcurrent and close the IGBT, and each component is further protected from being damaged.

An energy recovery circuit for a flyback circuit. The flyback circuit includes a transformer having a primary winding. The energy recovery circuit includes an energy recovery branch coupled in parallel to the primary winding and a recovery control integrated circuit having a plurality of pins. The energy recovery branch includes an auxiliary switch and a clamping capacitor coupled in series. Wherein a first pin receives an external supply voltage, a second pin is for a power ground different from a primary ground. A third pin is for sensing a current flowing through the energy recovery branch. A fourth pin is for controlling operation of the auxiliary switch. A fifth pin is coupled to an external resistor for setting a maximum on-time threshold of the auxiliary switch.

The present disclosure relates to a circuit for reading out a resistance value, a method for reading out a resistance value, and a method for programming on and off speeds of an integrated power switch. A digital resistance value measurement method includes providing a semiconductor chip including a first pin and a second pin, where the first pin is configured to be applied with a first voltage, and where the second pin is configured to be applied with the first voltage or a second voltage, connecting a first external resistor between the second pin and a reference potential, and connecting a second external resistor between the second pin and the reference potential. And connecting a second external resistor between the first pin and the second pin, in a first step, a first voltage is applied to the second pin, in a second step, a second voltage is applied to the second pin, and wherein the first digital resistance value is used to generate an error correction current.

The utility model belongs to the technical field of flyback power supplies, and particularly provides a power supply control chip, a flyback AC-DC circuit and a power supply, and the power supply control chip integrates a high-voltage power tube, a low-voltage power tube, a voltage detection unit, a current sampling unit, a constant-voltage constant-current unit and a logic control unit, and does not need an external starting circuit and a VCC power supply circuit. An external sampling circuit is not needed, an Iset pin is provided, and power is set through an external resistor; when the transformer with double windings is adopted, an auxiliary winding is not needed, on the basis of simplifying a system circuit and optimizing system cost, chip functions of output voltage detection, input overvoltage and undervoltage protection and the like are achieved, zero-cross detection of inductive current is also achieved, the effect that a power tube is switched on when HV resonance voltage reaches the valley bottom is achieved, and the service life of the power tube is prolonged. And high-efficiency power supply conversion is realized.

This utility model relates to the field of couplers with external resistors, and discloses a coupler with an external resistor, including a coupler body and a resistor body. The resistor body is placed on the surface of the coupler body, and the surface of the coupler body is provided with a mounting structure. The mounting structure includes two brackets, both of which are fixedly connected to the surface of the coupler body. A pin is slidably inserted into the surface of the bracket. This external resistor coupler, by setting the mounting structure, achieves good contact between the electrode plate and the resistor body by using a pressure plate to push the electrode plate against the pin surface of the resistor body. The other end of the transmission line electrically connected to the surface of the electrode plate is electrically connected to the coupler body, thereby ensuring the connection between the resistor body and the coupler body. The connection is made by pressing, which facilitates the replacement of the resistor body and avoids damage to the coupler body when disassembling the resistor body.

A chip includes a configuration pin, an internal pull-up resistor, an internal pull-down resistor, a logic level detection circuit, and a configuration detection circuit. The configuration pin is electrically connected with the reference voltage end through the external resistor. The configuration detection circuit is used for connecting an input end of a logic level detection circuit (the logic level detection circuit can be a digital logic buffer, a comparator or other circuit which can be used for detecting a logic level) to a configuration pin, and is also used for carrying out the following steps. And disconnecting the internal pull-up resistor and the internal pull-down resistor from the configuration pin, so that the logic level detection circuit outputs a zeroth detection logic value. The internal pull-up resistor and the internal pull-down resistor are sequentially connected with the configuration pin, so that the logic level detection circuit outputs a plurality of detection logic values. A configuration vector is determined according to the zeroth detection logic value and the plurality of detection logic values.

The application belongs to the technical field of vehicle control, and provides an anti-impact electromagnetic suspension system and a control method, the system comprising: an electromagnetic damper, an air spring and an external resistance control unit, the electromagnetic damper comprising a damper shell, a ball screw, a screw nut, a vibration transmission device and an anti-impact device, a coil being bonded in the damper shell; the vibration transmission device is matched with the screw nut through the anti-impact device; the outer surface of the rotating shell is uniformly covered with magnets. The application omits the motor, the shaft coupling and other components in the general electromagnetic damper, designs the ball screw, the coil and the magnets generated by the electromagnetic damping to the same plane, significantly reduces the axial length of the damper, controls the switch of the external resistance through a semi-active control strategy, further controls the current inside the coil, controls the size of the ampere force, and realizes the real-time control of the electromagnetic damper.

Provided are a ZQ calibration circuit and a ZQ calibration method. The ZQ calibration circuit includes: a first calibration circuit; and a second calibration circuit sharing a first ZQ voltage with the first calibration circuit, wherein the first ZQ voltage is generated from a ZQ pad connected to an external resistor. The first calibration circuit includes: a first comparator; a second comparator; a first pull-up counter; a first pull-up driver; and a first switch electrically interconnecting the first pull-up counter. The second calibration circuit includes: a third comparator; a fourth comparator; a second pull-up counter; a second pull-up driver; and a second switch connected to the second pull-up counter and turned on based on a second logic level of the clock signal to electrically interconnect the second pull-up counter and the second pull-up driver.

A threshold voltage adjustment circuit of an embodiment includes a reference current circuit and a trans-impedance circuit. The reference current circuit is formed on a substrate and outputs a reference current. The trans-impedance circuit has a plurality of resistors on the substrate, and outputs a threshold voltage that is expressed as a function of a reference current and a combined resistance of the plurality of resistors and an external resistor.

The invention discloses a positive and negative pulse width truncation system and method.In the system, a starting circuit is connected with the anti-phase end of a comparator through a biasing circuit, the control end of a signal selector MUX1 receives positive / negative pulse selection signals, and the two input ends of the signal selector MUX1 receive pulse input signals and negation signals of the pulse input signals respectively; the output end of the signal selector MUX1 is connected with one end of an external resistor, the other end of the resistor is respectively connected with one end of an external capacitor and the in-phase end of the comparator, and the other end of the capacitor is grounded; the output end of the comparator and the output end of the signal selector MUX1 are connected with the input end of the first AND gate, the output end of the first AND gate is connected with one input end of the signal selector MUX2, and the output end of the first AND gate is connected with the other input end of the signal selector MUX2 through the second inverter; the device has the advantages that the pulse ultra-wide part is cut off, the chip occupies a small area, adjustable positive and negative pulses can be generated, and chip testing is facilitated.

The present disclosure relates to a semiconductor memory device, a memory system, and a memory die, the semiconductor memory device including external resistors in a board and memory dies on the board. A first memory die among the memory dies is designated as a master die, and the remaining memory dies are designated as slave dies. The master die includes a first output driver and a first communication pad. The master die determines a first control code set associated with the first output driver based on a first power supply voltage, latches the first control code set, generates a first completion signal indicating that the first control code has been set, transmits the first completion signal to a first slave die through the first communication pad, determines a second control code set associated with the first output driver based on a second power supply voltage based on the first completion signal, and latches the second control code set.

The invention discloses a battery protection chip, a cascade battery protection circuit and an electronic device, the battery protection chip comprises a cell connection pin, a first charge and discharge control pin, a second charge and discharge control pin, a load signal feedback pin and a voltage detection pin; the cascade level detection circuit and the charging and discharging control circuit are integrated in the battery protection chip, and the cascade level detection circuit is integrated in a single chip, so that the cascade level detection circuit can automatically identify a high-level side working mode or a low-level side working mode according to the level of a first charging and discharging control pin; and a signal processing path of an internal charging and discharging control circuit is correspondingly configured in the mode, so that when a cascade system is constructed, reliable protection can be realized only by a few external resistors, the number of peripheral devices is greatly reduced, the hardware cost and the circuit design complexity are reduced, and the reliability of the cascade system is improved. And chips of the same model can be universally used in cascade and non-cascade scenes, so that the material preparation and application design of customers can be obviously simplified.

The invention discloses a power MOS tube with a grid anti-surge function. The power MOS tube comprises a substrate layer; the epitaxial layer is positioned on the front surface of the substrate layer; the MOS tube main body is formed on the epitaxial layer and is provided with a channel structure, a source electrode structure and a grid electrode structure; the grid protection structure is composed of an in-grid resistor, an out-grid resistor and a grid protection zener transistor pair; the in-gate resistor is formed at the tail end of a gate bus of the MOS tube main body; the gate external resistor and the gate protection zener transistor pair are formed below the gate bonding pad metal layer; wherein a first end of the in-gate resistor is in short circuit with a gate bus of the MOS tube main body, a first end of the out-gate resistor and a first end of the gate protection zener pair are in short circuit with a second end of the in-gate resistor, and a second end of the gate protection zener pair is in short circuit with a source electrode of the MOS tube main body. The second end of the external gate resistor is in short circuit with the gate pad metal layer. The gate structure of the MOS tube can be effectively protected from surge voltage impacts of various frequencies, the application range of the power MOS tube is expanded, and the continuously-increasing miniaturization requirement of an existing electronic product is met.

An audio amplifier chip includes an audio amplifier, a current providing circuit, a detection circuit, and a control circuit. The audio amplifier is arranged to drive a speaker, wherein the audio amplifier has multiple differential input terminals, and a direct current (DC) blocking capacitor is coupled to one of the multiple differential input terminals. The current providing circuit is arranged to provide at least one current for charging the DC blocking capacitor. The detection circuit is coupled to a node located between the one of the multiple differential input terminals and the DC blocking capacitor, and is arranged to detect whether an external resistor of the audio amplifier chip exists according to an input voltage from the node, in order to generate a detection result. The control circuit is arranged to determine a start-up time of the audio amplifier according to the detection result.

The utility model belongs to the technical field of flyback power supplies, and particularly provides a power supply control chip, a flyback circuit and a power supply, and the power supply control chip integrates a high-voltage power tube, a low-voltage power tube, a voltage detection unit, a current sampling unit, a power control unit and a logic control unit, and does not need an additional starting circuit and a VCC power supply circuit. An external sampling circuit is not needed, an Iset pin is provided, and power is set through an external resistor; an auxiliary winding is not needed when the transformer with the double windings is adopted, comprehensive chip protection functions such as output overvoltage and undervoltage protection and input overvoltage and undervoltage protection are achieved on the basis of simplifying a system circuit and optimizing system cost, zero-cross detection of inductive current is achieved, the effect that a power tube is switched on at valley voltage is achieved, and the service life of the power tube is prolonged. And high-efficiency power supply conversion is realized.

The invention relates to the technical field of chemical energy storage, and discloses an electrochemical energy storage PACK balance test system and test method. The equalization test system comprises an external power supply, an external resistor, a series line and a connecting terminal, a plurality of energy storage devices are connected in series through the series line to form an energy storage PACK, the external power supply is used for charging the energy storage PACK or the energy storage devices, the external resistor is used for discharging the energy storage PACK or the energy storage devices, and a battery management system is used for controlling charging and discharging. According to the equalization test system, the energy storage PACK is charged firstly, so that the SOC of each energy storage device is consistent, and then one energy storage device is discharged; or discharging the energy storage PACK, then independently charging a certain energy storage device to obtain the theoretical equalization time and the actual equalization time of the energy storage PACK, and verifying whether the equalization capability and the equalization strategy of the battery management system BMS meet the requirements or not according to the actual equalization time and the theoretical equalization time of the PACK so as to test the equalization function of the BMS.

The present application belongs to the technical field of analog circuit power management, and particularly relates to a kind of adjustable dead zone or overlap time generation circuit.The circuit of the present application includes adjustable current generation circuit, delay circuit and comparator.The adjustable current generation circuit provides adjustable charging and discharging current for the delay circuit to determine the delay time, and the comparator shapes the signal passing through the delay circuit into a square wave signal.Under fixed dead zone or overlap time, the efficiency of switching power supply is relatively low or the power tube has the risk of punch-through under certain application conditions.By adjusting the size of the dead zone or overlap time with an external resistor, the efficiency of the switching power supply under all application conditions can be maximized.In addition, the present application realizes structure reuse and current self-compensation technology, thereby improving circuit utilization and implementation accuracy.

The present application belongs to the technical field of analog integrated circuits, and particularly relates to an input current mean value sampling circuit. The present application is directed to an application scene with a blocking power tube, and a problem that a traditional current detection circuit needs an external resistor and an additional pin, and proposes a low-power integrated input current mean value sampling circuit without a resistor connected in series in a power stage, which can be applied to current limitation or overcurrent protection of a circuit and the like.

Embodiments provide a threshold voltage adjustment circuit and a semiconductor integrated circuit capable of easily adjusting a threshold voltage. A threshold voltage adjustment circuit according to an embodiment includes a reference current circuit and a transimpedance circuit. The reference current circuit outputs a reference current formed on the substrate. The transimpedance circuit has a plurality of resistors on a substrate, and outputs a threshold voltage represented by a function of a reference current and a combined resistance of the plurality of resistors and an external resistor.

A secondary-side controller applied to a flyback power converter prevents a secondary side of the flyback power converter from conducting incorrectly. The secondary-side controller includes a first comparison circuit, a second comparison circuit, and a gate control signal generation circuit. The first comparison circuit generates a first comparison signal according to a drain voltage of a synchronous switch of the secondary side of the flyback power converter and a first parameter. The second comparison circuit generates a ready signal according to the first comparison signal and a resistance of an external resistor. The gate control signal generation circuit generates a gate control signal to the synchronous switch according the ready signal and the drain voltage, and the synchronous switch is turned on according to the gate control signal.

The invention relates to the technical field of electronic measurement, in particular to a high-voltage side current detection circuit and system based on potential translation, which can translate high common-mode voltage borne by two ends of a sampling resistor to a safe low common-mode voltage domain without distortion by using a current mirror. A subsequent signal extraction and amplification module does not need to directly bear a high common-mode voltage, so that the withstand voltage limitation of a traditional special detection chip is broken through, hundreds of volts or even higher common-mode voltage endurance capability can be realized only by selecting an external resistor with a proper withstand voltage level, and the adoption of a special current detection and amplification chip with high manufacturing cost is avoided; and the circuit cost is obviously reduced. Besides, the influence of transistor parameter drift in a current mirror of the potential translation module appears in a common mode form in a differential signal path, and can be effectively suppressed by a subsequent signal extraction amplification module with a high common mode rejection ratio, so that the overall detection precision and temperature stability of the system are guaranteed while high withstand voltage is realized.

The invention relates to the field of integrated circuits, in particular to a low-temperature-drift frequency linear adjustable oscillator circuit which comprises a linear programmable low-temperature-drift current generator and a ring oscillator. The linear programmable low-temperature drift current generator generates low-temperature drift current, and the ring oscillator generates square waves according to the low-temperature drift current; according to the oscillator circuit with the linearly adjustable low-temperature-drift frequency, the oscillation frequency and the external frequency modulation resistor have a strong linear relation, square wave signals with extremely low temperature drift can be provided, it is ensured that clock signals in different temperature environments are consistent, meanwhile, the oscillation frequency can be linearly adjusted through the external resistor, and full-band low-temperature-drift output is achieved.

The invention provides a dynamic temperature compensation heating method based on a dual-power mirroring law, which is applied to an aerosol generation system consisting of a cigarette cartridge and a smoking set, and is characterized in that two stages of composite atomization are performed on the same cigarette cartridge through an integrated electromagnetic center heating and resistance circumferential heating dual-mode collaborative technology, and different heating modes are adopted in each stage; the system executes a specific algorithm through the controller to adjust the heating power Pc of the electromagnetic center inside the smoke cartridge and the circumferential heating power Pe of the resistor outside the smoke cartridge, so that the radial temperature difference of the smoke cartridge is converged to a set value Ttar. According to the invention, the change rate of the central heating power Pe directly participates in the feedforward-feedback composite operation of the circumferential heating power Pe, so that the radial heat flow potential is cleared at one time, a cold region in a single mode can be fully carbonized, and the overall utilization efficiency of an aerosol matrix is improved.

The application relates to the technical field of communication base stations and security monitoring of machine rooms, in particular to a dry contact anti-theft sensor performance enhancement active device which comprises an NE555 chip, a triode, an intermediate relay, an upper pull resistor, an external monitoring loop and a filter capacitor; the 1st pin of the NE555 is grounded, the 4th pin and the 8th pin are connected with a power supply VCC, the 5th pin is grounded through a capacitor, the 2nd pin and the 6th pin are short-circuited as a detection end, the 7th pin is connected to the 2nd pin / 6th pin through an external resistor and a monitoring copper wire, and the 3rd pin output is connected with the base of the triode through a current-limiting resistor; whether a thief cuts the circuit or short-circuits the circuit in advance, the device outputs an alarm, the biggest vulnerability of a traditional dry contact is completely blocked, the three states of normal, disconnection and short-circuit can be accurately distinguished, the logic is rigorous, there is no dead angle, a passive weak signal is converted into an active strong signal, the transmission distance is farther, the anti-interference is stronger, the false alarm rate is lower, the output is a standard dry contact, the device can be directly connected with a dynamic ring collector, a platform does not need to be transformed, and a sensor does not need to be replaced.

The invention discloses a broadband radio frequency transceiving multifunctional chip covering a low frequency band and having an internal multi-module multiplexing structure, and belongs to the technical field of semiconductor radio frequency devices. A five-bit numerical control attenuator, four single-pole double-throw switches, a two-stage amplifier, a fixed attenuator, a biasing circuit and a TTL level driving circuit are integrated in the chip. Through a specific topological connection structure, hardware multiplexing of the first amplifier and the five-bit numerical control attenuator between a receiving channel and a transmitting channel is realized by using four single-pole double-throw switches, and the chip area and power consumption are remarkably reduced. The broadband coverage from a hundred MHz level low frequency to a ten GHz level high frequency is realized through a biasing circuit structure with multiple levels of inductors connected in series and RC grounded between the levels. A static working point adjusting port is led out from the chip, and power consumption and linearity can be flexibly configured through an external resistor. The invention has the advantages of high integration level, low power consumption, large bandwidth, strong universality and good index consistency, and is particularly suitable for multi-channel transmit-receive systems such as phased array radars and the like.