263 results about "Linear regulator" patented technology

The invention discloses an overcurrent protection control circuit of a low-dropout linear regulator and the low-dropout linear regulator, and relates to the field of voltage regulators. A first sampling module is connected with a drain electrode, a grid electrode and a source electrode of a power control tube in the low-dropout linear regulator and a first current comparator; the first current comparator is further connected with the grid electrode of the first protection switch and the input voltage end of the low dropout linear regulator, the source electrode of the first protection switch is connected with the grid electrode of the power control tube, the drain electrode of the first protection switch is grounded, and the source electrode of the power control tube is connected with the voltage output end of the low dropout linear regulator; the second sampling module is respectively connected with the drain electrode of the power control tube, the grid electrode of the power control tube and the clamping module, the clamping module is connected with the grid electrode of the second protection switch through the second current comparator and is also connected with the source electrode of the power control tube, the drain electrode of the second protection switch is grounded, and the source electrode of the second protection switch is connected with the grid electrode of the power control tube. The reliability of current limiting can be improved.

The invention belongs to the technical field of analog integrated circuit design and memory read-write, and provides a multi-valued RRAM read-write circuit with a write-and-read function. The multi-valued RRAM read-write circuit is a multi-port device capable of performing read-write simultaneously, in write operation, a low dropout regulator is utilized to provide voltage for the RRAM circuit and the standard resistance circuit, mirror current is generated, the resistance value of the RRAM is set to be the total resistance of the standard resistance circuit, an operational amplifier is connected into the circuit through a CMOS switch, and feedback is formed to stabilize the voltage at the two ends of the RRAM; and in the read operation, the CMOS switch is used for disconnecting the operational amplifier, and the voltage at the two ends of the RRAM device is directly read. Compared with an existing multi-valued read-write circuit, the multi-valued RRAM read-write circuit has the advantages that write-and-read multi-valued RRAM read-write is realized, and meanwhile, the read-write circuit is not separated, so that the write-in speed is increased, and the area of the read-write circuit is saved.

The ultralow frequency sensor comprises a vibration detection unit, a power supply voltage stabilization unit and a signal conditioning unit, the power supply voltage stabilization unit is provided with a low dropout linear voltage regulator U20, a voltage converter U19 and a negative voltage regulator U21, and the low dropout linear voltage regulator U20 stabilizes an external power supply as a positive power supply VCC; the voltage converter U19 is used for converting positive voltage of an external power supply into negative voltage and outputting stable negative power supply VEE through the negative voltage stabilizer; the positive power supply VCC and the negative power supply VEE supply power to the signal conditioning unit; the signal conditioning unit comprises a high common mode rejection differential amplifier, a differential-to-single-ended amplifier, a band-pass filter and a differential output driver, a differential signal output by the vibration detection unit sequentially passes through the high common mode rejection differential amplifier, the differential-to-single-ended amplifier, the band-pass filter and the differential output driver, and then a differential voltage signal is output; the method has the advantages of high stability and reliability and the like.

The embodiment of the invention provides a multi-output isolated power supply, which comprises a power transformer comprising a single primary side coil and a single secondary side coil; a switch driving circuit coupled to the primary coil to output a driving voltage to the primary coil based on the input voltage; a rectification circuit coupled to the secondary coil and configured to rectify a voltage across the secondary coil to output a first DC voltage at a first rectified voltage output end and a second DC voltage at a second rectified voltage output end; and an output unit coupled to the first rectified voltage output terminal and the second rectified voltage output terminal, the output unit comprising one or more low dropout linear regulator circuits, where an output terminal of a predetermined low dropout linear regulator circuit is coupled to the secondary circuit ground, the output unit is configured to output at least one positive voltage and at least one negative voltage with a voltage at an output terminal of a predetermined low dropout linear regulator circuit as a reference.

The present disclosure proposes a switching power supply, comprising a power supply capacitor, for generating a power supply voltage to supply a control chip of the switching power supply with power, its first end being connected to the power supply terminal of the control chip of the switching power supply, its second end being grounded, and the first end generates a power supply voltage; a linear regulator circuit connected between the first end of the power supply capacitor and a common connection end of the main power transistor and the auxiliary power transistor; wherein, the voltage at the connection end between the main power transistor and the auxiliary power transistor charges the power supply capacitor through the linear voltage regulator The present disclosure can save power consumption, improve the working efficiency of switching power supply, and optimize the EMI of switching power supplies.

An example apparatus includes a first transistor having a control terminal and first and second terminals. The apparatus includes a second transistor having a control terminal and first and second terminals, the second terminal of the second transistor coupled to the second terminal of the first transistor. The apparatus includes a first amplifier having a first input, a reference input, and an output, the first input of the first amplifier coupled to the first terminal of the first transistor, the output of the first amplifier coupled to the control terminal of the first transistor. The apparatus includes a second amplifier having first and second inputs and an output, the first input of the second amplifier coupled to the first terminal of the first transistor, the second input of the second amplifier coupled to the first terminal of the second transistor, and the output of the second amplifier coupled to the control terminal of the second transistor. The apparatus includes a control circuit coupled to the control terminal and the second terminal of the second transistor and coupled to the first transistor, the control circuit capable of adjusting a voltage at the control terminal of the second transistor responsive to a current through the first transistor.

The invention discloses a low output voltage detection circuit based on a low dropout linear regulator, relates to the technical field of power supply detection, and realizes accurate detection of an output voltage rising stage through cooperation of a first amplification delay circuit, a second amplification circuit and a first comparison circuit; through cooperation of a third amplification circuit, a fourth amplification time-delay circuit and a second comparison circuit, reliable monitoring of an output voltage drop stage is completed. Wherein the amplification circuit can flexibly adjust the amplification factor to adapt to wide-range output voltage detection; the time delay circuit can accurately regulate and control the signal overturning time sequence, and the system control requirement is met; the comparison circuit and the AND gate circuit construct a rigorous logic control system, and the accuracy of signal output is guaranteed. Through creative combination of the circuit modules, an efficient low-output voltage detection scheme is formed, the technical problem that the voltage establishment state cannot be reflected in a low-voltage scene is thoroughly solved, and accurate detection of the low-output voltage of the LDO is achieved.

The embodiment of the invention provides a multi-power-domain power management method, a power management system and electronic equipment, and relates to the technical field of power consumption management. The method is applied to a power supply normally open domain of the power supply management system, the power supply management system further comprises a main low dropout linear regulator, a plurality of power supply domains, a power supply switch array and an analog domain, the main low dropout linear regulator and the analog domain are connected with an external power supply, and the main low dropout linear regulator is connected with the power supply domains through the power supply switch array. The analog domain comprises a high-speed clock; the method comprises the following steps: in response to a standby mode entering instruction, sending a first control signal to an analog domain to turn off a high-speed clock; sending a group of second control signals to the power switch array to cut off power supply to at least one target power domain; and sending a third control signal to the main low-dropout linear voltage regulator to regulate the main low-dropout linear voltage regulator to enter a low-power-consumption working mode Therefore, the time for entering the low-power-consumption mode can be reduced.

According to the control on-chip low dropout linear regulator and off-chip triode current distribution circuit provided by the embodiment of the invention, two signals output by a common end between a drain electrode of a first NMOS (N-channel Metal Oxide Semiconductor) tube and a first current source and a common end between a drain electrode of a second NMOS tube and a second current source are utilized; the logic of the digital control unit is controlled, and the purpose of distributing current between the interior of the low-voltage linear voltage regulator and the triodes according to a design value is achieved.

The present disclosure relates to a device having a supply input receiving a supply voltage, a switched-mode power supply comprising an output at which is generated a supply voltage, and a voltage linear regulator supplying a load, the regulator receiving the supply voltages, the regulator including two transistors coupled between the supply input, respectively the output of the supply, and an output node of the regulator. When the current drawn by the load is below a threshold, an output current delivered to the load is equal to a current flowing through the transistor, so that, when the current drawn by the load is above the threshold, the output current is equal to a current flowing through the transistor plus a current flowing through the transistor.

The invention provides a low dropout regulator and a power management system, and relates to the technical field of power management. The low dropout linear regulator comprises a power supply assembly, an operational amplifier module, a reference voltage module, a regulating module and a feedback module, wherein the regulating module at least comprises one NMOS (N-channel Metal Oxide Semiconductor) regulating tube. The power supply assembly is used for providing power supply voltage for the operational amplifier module, and the value of the power supply voltage is larger than the driving voltage value of the NMOS adjusting tube. The reference voltage module is used for providing reference voltage for the operational amplifier module; the feedback module is used for obtaining a first feedback voltage based on the output voltage of the voltage stabilizer; the operational amplifier module is used for generating a control signal according to the reference voltage and the output voltage so as to adjust the conduction degree of the NMOS adjusting tube. Based on this, the problem of balance among the output capability, stability and power consumption of the charge pump in the prior art can be improved, and the transient response speed and the low power consumption performance are considered at the same time.

The application discloses a kind of static current control systems of double data rate linear voltage regulator, including reference generating circuit and by feedback control circuit, error amplifier circuit and power output circuit constitute idle power consumption control circuit, reference voltage VREF generated by reference generating circuit is exported to feedback control circuit, after feedback control circuit compares the control signal output by error amplifier circuit, exports to error amplifier circuit to make the control signal output by error amplifier circuit also change, the control signal in turn controls upper and lower power tube in power output circuit, by adjusting VREF generated by reference generating circuit, to flexibly adjust system idle power consumption, while considering low power consumption and the fast transient response of load switching.

The present application relates to the technical field of analog circuit, and discloses a charge pump.The charge pump comprises a first voltage boosting control circuit, a second voltage boosting control circuit, a first voltage lifting circuit and a second voltage lifting circuit.The first voltage boosting control circuit can generate a first multiplex signal at a first node and a second multiplex signal at a second node in response to an input voltage and a control signal.The second voltage boosting control circuit comprises a third node and a fourth node.The first voltage lifting circuit is connected between the first node and the third node, and the second voltage lifting circuit is connected between the second node and the fourth node.When the control signal is a first level signal, the first voltage lifting circuit lifts the voltage of the third node to a first multiplex voltage according to the first multiplex signal, and the second voltage boosting control circuit outputs a target voltage in response to the first multiplex voltage of the third node and the input voltage.The same is true when the control signal is a second level signal.Therefore, the embodiment does not need to increase an additional circuit to drive the charge pump.

A linear regulator includes: a first output stage circuit for generating a first output voltage according to a first control voltage; and a calibration circuit, enabled during a first calibration period after startup of the linear regulator. During the first calibration period, the calibration circuit is configured to operably generate the first control voltage based on an output-related signal and a reference voltage, and the output-related signal is related to the first output voltage. The first output stage circuit and the calibration circuit form a first control loop which enters an open-loop state after the end of the first calibration period. The first output stage circuit includes a second control loop, configured to operably regulate the first output voltage in a closed-loop manner based on the first control voltage and a variation of the first output voltage during an operational period following the first calibration period.

The application provides a transient response enhanced multi-loop low-dropout linear voltage regulator, comprising: a bias module for providing a bias voltage; a band gap reference module for providing a reference voltage; a power tube for providing an output voltage; a voltage follower for generating a control voltage and a driving current based on the bias voltage and the reference voltage; a source-coupled error amplifier for generating a gain voltage according to the output voltage and the control voltage; a common gate for generating a first voltage according to the reference voltage and the gain voltage; a pseudo-differential common gate for generating a second voltage according to the reference voltage and the gain voltage; and a dynamic super source follower for forming a push-pull structure at the gate of the power tube according to the first voltage and the second voltage. The application can effectively improve the transient response performance of the voltage regulator.

A multi-die module includes: a first semiconductor die having an internal line, an external electrode, and multiple internal electrodes and including a first control circuit that control a DC-DC converter; a second semiconductor die having multiple internal electrodes and including a second control circuit that controls a linear regulator; and a package that supports the first and second semiconductor dies. The second control circuit includes a voltage comparison circuit having a feedback input, a reference input, and a comparison output. In each of the first and second semiconductor dies, the multiple internal electrodes includes a first internal electrode. The feedback input of the voltage comparison circuit is connected to the first internal electrode of the second semiconductor die, which is connected to the first internal electrode of the first semiconductor die. The internal line connects the first internal electrode of the first semiconductor die to the external electrode.

The utility model discloses a pulse modulation circuit of an ultra-wideband super-continuum fiber laser, belongs to the technical field of ultra-wideband super-continuum fiber lasers, and solves the problem that the phase noise floor of a clock circuit is directly lifted due to the fact that power supply ripple coupling and LDO filter network efficiency is insufficient, for example, the output capacitance ESR is too high or a pi-type filter is missing. Comprising an input filtering module, a low dropout linear regulator module, a pi-type filter module, a clock power supply distribution module and a grounding system module. According to the utility model, high-frequency ripple filtering, voltage ripple depth suppression and residual noise absorption are carried out on power supply output through a three-stage sequential filtering framework, and finally, super-stable power supply with a phase noise base lower than-152dBc / Hz and 1kHz offset is provided for the clock circuit, so that the time sequence precision of super-continuum spectrum laser pulses is ensured.

A programmable battery pack including a switch arrangement module having at least one rechargeable battery with and at least one single pole single throw (SPST) switch, a system power supply having at least one linear regulator and at least one single pole single throw (SPST) switch, at least one controller module having a micro-controller executing a pre-programmed firmware, and an external power supply.

Embodiments of the present application provide a high-power low-dropout linear regulator system, which can be applied to the field of electronic circuit and power filter technology. The linear regulator system comprises a feedback compensation module and a driving sampling module, wherein the driving sampling module comprises a driving unit, a power adjustment transistor and a voltage dividing and sampling network; the voltage dividing and sampling network is configured to divide the initial output voltage to generate a feedback voltage signal; the feedback compensation module is configured to perform error amplification processing on the feedback voltage signal and a reference voltage signal from a reference voltage source to output a driving signal; the driving unit is configured to perform impedance conversion on the driving signal to output a buffer driving signal; and the power adjustment transistor is configured to linearly convert a direct current input voltage provided by a direct current power supply into an output voltage after voltage stabilization according to the buffer driving signal.

The present application relates to the technical field of voltage stabilizing circuit, in particular to a low-cost fast transient response linear voltage stabilizer circuit, comprising an LDO main loop module and a transient response enhancement feedback circuit, the transient response enhancement feedback circuit is coupled between the error amplifier output end and the power tube gate end, a fast feedback path is constructed through two groups of coupling capacitors, directly acting on the power tube gate, and cooperating with the clamping unit to accelerate the node voltage change. The present application cancels the complex modules such as comparator and band gap reference in the traditional scheme, without relying on large off-chip capacitors, the voltage overshoot and undershoot during load jump can be effectively suppressed, the circuit structure is simple, the static power consumption is low, the layout area is small, the manufacturing cost is low, and the system reliability and integration are high.

The application provides a power supply filtering circuit, a power supply module and an electronic device, and belongs to the field of switching power supplies. The power supply filtering circuit comprises a low dropout linear regulator (LDO) and a virtual ground voltage generating circuit. An input end of the LDO is used to receive an input voltage as an input end of the power supply filtering circuit, and an output end of the LDO is used to output an output voltage as an output end of the power supply filtering circuit; an input end of the virtual ground voltage generating circuit is coupled with the input end of the LDO, and an output end of the virtual ground voltage generating circuit is coupled with a ground end of the LDO; the virtual ground voltage generating circuit is configured to output a virtual ground voltage to the ground end of the LDO, and the virtual ground voltage changes in the same direction as the input voltage, so that the LDO is in a normal working state. The application embodiment enables the LDO to still work normally in the filtering scene of dynamic high-voltage input or wide-voltage input range.

This invention belongs to the field of analog integrated circuit design, and particularly relates to a low-dropout linear regulator with fast dynamic response and high stability. It includes: an error amplifier, a Class AB buffer stage circuit, an output power transistor, a positive feedback resistor compensation circuit, an undervoltage detection circuit, and a startup circuit. The Class AB buffer stage circuit is used to improve the transient characteristics of the low-dropout linear regulator, and the positive feedback resistor compensation circuit is used to improve the phase margin of the low-dropout linear regulator. This invention achieves fast dynamic response, essentially eliminates overshoot and undershoot phenomena, and significantly shortens the recovery time. It also maintains high stability while ensuring loop gain and includes undervoltage detection functionality to ensure smooth system startup.

A low dropout linear regulator circuit, a power supply chip and an electronic device wherein the low dropout linear regulator circuit comprises: a voltage input terminal for receiving an input voltage; the anti-surge module comprises a bidirectional TVS (Transient Voltage Suppressor) tube, and the anti-surge module is connected with the voltage input end and is used for carrying out voltage stabilization processing on the input voltage and reducing peak burrs of the input voltage; a first electrostatic protector, wherein the first electrostatic protector is connected with the anti-surge module; the linear voltage regulator module comprises an input end and an output end, and the input end of the linear voltage regulator module is connected with the first electrostatic protector; and the voltage output end is connected with the output end of the linear voltage regulator module and is used for providing output voltage, and the anti-surge capability of the power supply chip is remarkably improved on the basis of not increasing the process complexity of the module.

The utility model relates to a battery-powered intelligent differential pressure flowmeter, which comprises a microcontroller M261, and a power supply module, an LCD (liquid crystal display) display module, a key input module, a communication module and a sensor module which are respectively connected with the microcontroller M261, the power supply module comprises two switchable power supply modes, namely an external photovoltaic voltage input mode and a built-in lithium battery mode, and a power supply stably outputs voltage for the microcontroller M261 to use through a low dropout regulator LDO; the sensor module comprises a differential pressure sensor, a compensation pressure sensor, a flow medium compensation temperature sensor and an NTC sensor. The differential pressure sensor, the compensation pressure sensor and the flow medium compensation temperature sensor are connected with differential amplification circuits respectively, the three differential amplification circuits are connected with the microcontroller M261 through the analog-to-digital converter, and the NTC sensor is connected with the microcontroller M261 through the analog-to-digital converter. Two power supply modes are supported, flexible use is facilitated, the power consumption of the whole machine is effectively reduced due to the circuit design, and the working time of the battery is prolonged.

The application discloses a driving circuit and a chip of a low-dropout linear regulator, which comprises a reference voltage generating module, a bias current generating module and a selection module. The selection module is connected with the reference voltage generating module and the bias current generating module respectively and receives a control signal. The selection module outputs a target bias current and a first reference voltage to the low-dropout linear regulator in a first time period based on the control signal, so that the low-dropout linear regulator switches from a first power consumption mode to a second power consumption mode, and then outputs a second reference voltage to the low-dropout linear regulator after the first time period to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode, and the target bias current gradually increases to a preset value over time. The second reference voltage is established by the reference voltage generating module in the first time period. In this way, the wake-up speed of the low-dropout linear regulator is increased, and the wake-up time of the low-dropout linear regulator is reduced.

This invention provides a wideband linear regulator circuit with high power supply noise suppression, comprising: a bandgap reference voltage source, a charge pump, an error amplifier, a summing module, a segmented FFRC compensation module, a buffer, an N-type power transistor MN, and a resistor feedback network; the bandgap reference voltage source generates a reference voltage; the charge pump performs voltage conversion and supplies power to the corresponding modules; the error amplifier compares the reference voltage with the sampled voltage output from the resistor feedback network, amplifies the comparison result, and outputs it to the summing module; the segmented FFRC compensation module generates a compensation voltage based on changes in load current and outputs the compensation voltage to the summing module; the summing module combines the compensation voltage with the amplified comparison result; and the buffer drives the N-type power transistor MN to suppress power supply noise entering the linear regulator circuit based on the compensation voltage, thereby achieving adaptive power supply noise suppression according to changes in load current.

The utility model provides a low dropout linear regulator which comprises a multi-output band-gap reference source, a filtering selection circuit and an adjusting output circuit, the multi-output band-gap reference source is used for outputting multiple paths of first reference voltage, and the filtering selection circuit can trigger on-off according to a received selection control signal. And the adjusting output circuit compares the second reference voltage with the output voltage and adjusts the output voltage, so that the output voltage is controlled to be the second reference voltage constantly, and constant-voltage output is realized. According to the low dropout linear regulator, the multi-output band-gap reference source, the filtering selection circuit and the adjusting output circuit are arranged, so that multi-gear adjustable, stable and low-noise direct-current voltage can be output, a high power supply rejection ratio is achieved, and the power supply requirements of different circuit modules or application scenes are met.

A linear voltage regulator is disclosed. The voltage regulator is configured and controlled such that its output current is substantially equal to the input current. A method for measuring electrical current consumption of a device under test (DUT) is disclosed. The test system comprises a power capacitor, a voltage regulator, and a switching circuit. The method may involve: controlling the switching circuit to switch the test system from a first state to a measurement state such that the power capacitor provides the capacitor voltage to the voltage regulator; detecting that loading by the DUT has caused the voltage of the power capacitor to drop below a threshold; and determining the electrical current consumed by the DUT based on the electrical current provided by the power capacitor in a time period corresponding to a duration of the measurement state.

The invention relates to an LED constant-current lighting system of an industrial endoscope and the industrial endoscope. The LED constant-current lighting system comprises a microcontroller unit, a digital-to-analog converter, an LED lamp, a switch type constant-current driving module, a low-dropout linear voltage regulator, a differential sampling operation unit and a charge pump converter, wherein the switch type constant-current driving module, the low-dropout linear voltage regulator, the differential sampling operation unit and the charge pump converter are respectively connected with a power supply; the microcontroller unit is connected with the digital-to-analog converter through an I2C communication bus; the digital-to-analog converter is connected with the constant-current driving module; the constant current driving module is connected with the anode of the LED lamp, and the cathode of the LED lamp is directly grounded; the low dropout regulator is respectively connected with the microcontroller unit and the digital-to-analog converter, and the differential sampling operation unit is connected in series between the constant current output end and the LED lamp; the charge pump converter provides a negative power supply for the differential sampling operation unit; meanwhile, the invention discloses an endoscope adopting the system. According to the invention, stable, stroboflash-free, color-fidelity and intelligently adjustable illumination can be provided for the industrial endoscope.

The invention provides an adaptive switching method and device for an energy obtaining mode based on a radio frequency energy supply tag, relates to the technical field of circuit control, and is applied to an energy obtaining circuit. The energy obtaining circuit comprises a rectifier, an energy storage capacitor, a charge pump, a switched capacitor type step-down circuit, a low dropout linear regulator, a dummy load, a full charge judgment circuit, a clock generator, a timer and a switch control circuit. The method comprises the steps of obtaining direct-current voltage output by a rectifier; a dummy load is connected to the direct-current voltage, and a timer is started for timing; in the timing process, whether the direct current voltage reaches a preset threshold value or not is detected through a full-power judgment circuit, and a detection result is obtained; and based on the detection result and the timing ending signal, the control switch selects an energy storage mode or a direct connection mode to supply power to the radio frequency energy supply tag. In the mode, the energy storage mode and the direct connection mode are adaptively switched according to the magnitude of the radio frequency energy, high sensitivity and quick response are both considered, and the adaptability and the checking efficiency of the tag in a variable environment are remarkably improved.