455 results about "Linear regulator" patented technology

The invention provides a three-loop on-chip integrated low-dropout linear voltage regulator, which comprises a three-port source follower type voltage follower, which comprises a first anti-phase end, a normal phase end, a second anti-phase end and a first output end; the error amplifier is used for comparing a reference voltage with an output voltage so as to provide a first control signal for the first anti-phase end; the self-feedback bias module is used for receiving an internal voltage signal of the three-port source follower type voltage follower so as to provide a second control signal for the second anti-phase end; the grid electrode of the power tube is connected with the output end, the source electrode is connected with the power supply voltage, and the drain electrode serves as a second output end and is used for receiving the adjusting signal output by the first output end; the output driving current of the power tube is adjusted based on the adjusting signal; and the bias module is used for providing bias voltage for the three-port source follower type voltage follower and the error amplifier. The transient response performance of the voltage stabilizer can be improved under the condition of no off-chip large capacitance.

The present invention provides a common-mode transient suppression protection circuit for a digital isolator, including a modulation circuit, a demodulation circuit and an isolation capacitor connected between the modulation circuit and the demodulation circuit. The modulation circuit includes a modulation circuit front-end and a drive circuit, which are connected in sequence, and a clamping module is arranged in the drive circuit. The protection circuit further includes a linear voltage regulator structure connected with the drive circuit, and a power supply clamp is arranged in the linear voltage regulator structure. By providing the linear voltage regulator structure having the power supply clamp and the drive circuit having the clamping module in the protection circuit, low-voltage devices in the drive circuit can be protected from being damaged by high-voltage signals generated by common-mode transient interference.

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 relates to the technical field of chip detection, and discloses a high-reliability power supply chip circuit fault detection system, which comprises a built-in self-test architecture integrated in a low dropout regulator chip, and the built-in self-test architecture is provided with a first test mode and a second test mode which are switched based on a mode switching control circuit. The detection module is used for detecting key performance parameters of an error amplifier sub-circuit in a low dropout linear regulator chip, the detection module is used for measuring the direct current loop gain, the offset voltage, the common mode rejection ratio and the power supply ripple rejection ratio of the amplifier in the first test mode, and the detection module is used for measuring the unity gain bandwidth of the amplifier in the second test mode. According to the invention, through the design of a built-in self-test architecture and two test modes, abnormal states such as differential circuit imbalance and feedback loop fault can be identified in a bare chip stage, chips with poor performance are rejected in advance, and the LDO chip is ensured to reach a ppb-magnitude high reliability standard.

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 invention discloses a low dropout linear regulator with a wide dropout range, which is characterized in that an error amplifier is supplied with power by output voltage of the low dropout linear regulator, and a common-gate buffer is supplied with power by input voltage of the low dropout linear regulator, so that a direct interference path of the input voltage to the output only exists in a common-gate buffer stage and an output stage; and the power supply rejection ratio is improved. The common-gate buffer solves the problem of margin loss caused by a traditional source follower circuit, a positive feedback loop arranged in the common-gate buffer is used for improving the slew rate of a driving signal VPGATE and providing a certain gain, and therefore the problem of margin under low dropout is solved, and the reliability of the driving circuit is improved. And the compensation circuit can adjust the compensation amount of the low-dropout linear regulator when the input voltage is higher than a preset threshold value, so that the stability of the low-dropout linear regulator under different working conditions is improved.

A low-dropout regulator having an output voltage switching circuit is provided. In the low-dropout regulator, a low-dropout linear regulator circuit outputs a regulating signal according to a voltage difference between a second terminal of a transistor and a regulating threshold voltage signal or a reference voltage. In the low-dropout regulator, a switch error amplifier circuit outputs a pull-up control signal according to a voltage difference between the second terminal of the transistor and a voltage pull-up switching signal. When a voltage selector circuit of the low-dropout regulator selects the regulating signal, the transistor operates to regulate an output voltage of the low-dropout regulator according to the regulating signal. When the voltage selector circuit selects the pull-up control signal, a switch component is turned on by the pull-up control signal such that the output voltage of the low-dropout regulator is directly pulled up by an input voltage.

The utility model provides a transient enhancement circuit applied to a low dropout regulator, and relates to the technical field of analog integrated circuits. The overvoltage detection circuit drives the charging and discharging circuit to charge the grid electrode of the power output tube to lower the output voltage when the output voltage of the low dropout linear regulator exceeds the first voltage threshold value, and meanwhile, the undervoltage detection circuit drives the charging and discharging circuit to charge the grid electrode of the power output tube to lower the output voltage when the output voltage is smaller than the second voltage threshold value. When the output voltage of the low dropout linear regulator changes instantly and rapidly along with a load or changes in a rapid jitter phenomenon of the input voltage, the charging and discharging circuit is driven to discharge the grid electrode of the power output tube so as to increase the output voltage. The low-dropout linear regulator can quickly and adaptively cooperate with a negative feedback loop included in the low-dropout linear regulator to realize a timely output voltage transient response adjustment effect, so that the corresponding output voltage can be effectively limited to a set threshold range and quickly recovered to a stable state.

The invention is suitable for the technical field of electronic circuits, and provides a wide-load-capacitance low-dropout linear regulator circuit, a power supply device and electronic equipment. The wide load capacitance low dropout linear regulator circuit comprises a bias module, a first operational amplifier module, a second operational amplifier module, a third operational amplifier module, a first compensation module and a second compensation module, and the first operational amplifier module is electrically connected with the bias module, the second operational amplifier module and the first compensation module. The third operational amplifier module is electrically connected with the second operational amplifier module, the second compensation module and the first operational amplifier module. A first zero point generated by the first compensation module is used for compensating the second pole, and a second zero point generated by the second compensation module is used for compensating the third pole. Therefore, according to the design architecture of the wide-load-capacitance low-dropout linear voltage regulator circuit provided by the embodiment of the invention, the two zero points effectively compensate the corresponding poles, the phase margin of the circuit is remarkably improved under the wide-range load capacitance, and the stability of the circuit is enhanced.

The invention relates to the field of integrated circuit design, and particularly discloses a high power supply rejection ratio and low swing driving frequency-locked loop circuit and a control method thereof, a low dropout regulator is adopted to provide independent power supply lower than a main power supply voltage for a voltage-controlled oscillator, and double optimization effects are achieved. The clean power supply provided by the low dropout linear regulator effectively isolates the interference of the main power supply noise to the voltage-controlled oscillator, so that the power supply noise suppression capability of the circuit is remarkably enhanced, and the jitter of an output clock signal is greatly reduced; and on the other hand, the working voltage of the voltage-controlled oscillator is allowed and dynamically regulated and controlled to be optimized in a low range meeting the performance according to the real-time load of the voltage-controlled oscillator, so that on-demand power supply is realized, the dynamic power consumption of the voltage-controlled oscillator is reduced to the maximum extent while the output quality is not reduced, and the energy efficiency of the whole circuit under different load conditions is improved.

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.

A multi-input low-dropout (LDO) linear voltage stabilizing circuit and a control method therefor. The multi-input LDO linear voltage stabilizing circuit comprises a LDO unit, comprising a first LDO linear regulator (LDO1) and a second LDO linear regulator (LDO2) connected to a same output node, wherein the first LDO linear regulator (LDO1) comprises a first operational amplifier (AMP1) and a first power device (201), the input voltage of the first LDO linear regulator (LDO1) is a first input voltage (VIN), the second LDO linear regulator (LDO2) comprises a second operational amplifier (AMP2) and a second power device (202), and the input voltage of the second LDO linear regulator (LDO2) is a second input voltage (BIAS); and a reference voltage selection unit (10), used for selecting, when the first LDO linear regulator (LDO1) is switched to the second LDO linear regulator (LDO2), the reference voltage of the first operational amplifier (AMP1) as a second reference voltage (VREFb), and the reference voltage of the second operational amplifier (AMP2) as a first reference voltage (VREFa), wherein the first reference voltage (VREFa) is higher than the second reference voltage (VREFb). By optimizing the structure and the working time sequence of a multi-input LDO circuit, stable switching among different LDOs can be achieved, the power supply fluctuation amplitude of an internal analog circuit is greatly reduced, the output voltage of the LDOs during different switching does not trigger UVLO by mistake, and the normal working state and good performance of the circuit are guaranteed.

The invention provides a transimpedance type flip voltage following driving linear voltage regulator, which comprises a control module and a transimpedance type flip voltage follower, namely a TIFVF module, and is characterized in that the control module comprises an error amplifier and a voltage-current converter which are connected in series; the output voltage Vout passes through a selectable divider resistor and then is fed back to an error amplifier to be compared with the reference voltage Vref to obtain an error signal, the error signal is amplified and conditioned by a compensation network to obtain a control voltage signal Vctrl, and the control voltage signal Vctrl passes through a voltage-current conversion circuit to obtain a current control signal Ictrl required by the TIFVF; the whole forms a negative feedback loop, and two links of error amplifier-voltage and current conversion provide enough loop gain.

The utility model provides a navigation computer circuit core board which comprises a core board, a micro control unit MCU and a field programmable gate array FPGA, the micro control unit MCU and the field programmable gate array FPGA are embedded in the core board, the core board is connected with a bottom board through a board connector, and the MCU is connected with a FLASH memory through an SDIO and performs read-write operation on the FLASH memory; the crystal oscillator is connected with the MCU and the FPGA and provides a frequency source; the linear voltage regulator LDO converts an external power supply into an internal power supply to supply power to each component; the number of the programming interfaces is two, and the programming interfaces are used for programming MCU and FPGA software; the MCU accesses the FPGA through an EXMC parallel bus; and the data acquisition interface and the external communication interface are arranged on pins of the inter-board connector. According to the utility model, the most complicated core part of the navigation computer circuit can be solidified, and the navigation computer circuit has the advantages of high performance, low cost, low power consumption, small size, abundant interfaces, simplicity and convenience in development and the like.

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 present invention relates to the technical field of battery management systems, and in particular to a battery management system for an unmanned aerial vehicle, wherein the battery management system comprises: an intelligent battery management module, a power switch module and an isolated power supply module; wherein the intelligent battery management module is electrically connected to the power switch module and the isolated power supply module respectively; wherein the intelligent battery management module comprises a buck converter, a low voltage difference linear regulator, a voltage measurement unit, a temperature measurement unit, a current measurement unit, a power management unit, a logic control unit, a MOSFET drive unit, a communication interface unit and a load detection unit; the present invention adopts an extremely simplified and highly integrated solution with a highly integrated, high-performance and high-precision intelligent battery management SOC as the core, thereby reducing the number of components, reducing the complexity of the solution and improving the reliability of the solution.

A buffer circuit, a linear regulator, a display panel, and a head-mounted display device. The buffer circuit (20) comprises an error amplification module (11), a voltage clamping module (12), and an output module (13); an input end of the voltage clamping module (12) is connected to an output end of the error amplification module (11), an output end of the voltage clamping module (12) is connected to a first input end (O1) of the output module (13), and the voltage clamping module (12) is configured to clamp, when a load current changes, the voltage of the output end of the error amplification module (11) and then transmit the clamped voltage to the first input end (O1) of the output module (13); and a second input end (O2) of the output module (13) is connected to an input end of the buffer circuit (20).

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.

The invention discloses a low dropout linear regulator with bidirectional current conduction capability, which is characterized in that two input ends of an error amplifier are respectively connected with signals VB and FB, and a power level of a linear transconductance ring is used as a light load power level; the first output end of the error amplifier is connected with the first input end of the linear transconductance ring, the first input end of the light load power level and the input end of the first source follower, and the output end of the first source follower is connected with the first input end of the heavy load power level. The second output end of the error amplifier is connected with the second input end of the linear transconductance ring, the second input end of the light load power level and the input end of the second source follower, and the output end of the second source follower is connected with the second input end of the heavy load power level. The problem that the quiescent current of a traditional bidirectional current conduction LDO is too large under the conditions of light load and no load is solved, and it is guaranteed that the output power tube can be completely conducted when the LDO works in an open loop mode.

The invention discloses a CNFET-based high-speed digital low dropout regulator power supply chip, which comprises a silicon-based SOC and a CNFET power supply management chip layer grown above the silicon-based SOC, a plurality of digital LDOs are arranged on the CNFET power supply management chip layer, the input end of the CNFET power supply management chip layer is connected to an external power supply end, and the output end of the CNFET power supply management chip layer is connected with the silicon-based SOC to supply power to the silicon-based SOC. The digital LDO comprises a comparator, a coarse adjustment unit, a fine adjustment unit and a voltage output unit which are connected in sequence. The input end of the comparator is respectively connected with a reference voltage end and the voltage output unit, and the output end is respectively connected to the coarse adjustment unit and the fine adjustment unit; the coarse adjustment unit comprises an adjustment controller and a coarse adjustment power transistor array which are connected with each other; the fine adjustment unit comprises a shift register and a fine adjustment power transistor array which are connected with each other. According to the invention, high-efficiency and stable voltage regulation can be realized under the condition of considering the response speed and the regulation precision.

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 invention relates to the technical field of low dropout linear regulator optimization, and discloses an FVF architecture-based efficient peak suppression quick response LDO voltage stabilizing circuit, which comprises an LDO module comprising an operational amplifier OPA, a PMOS tube MP, a resistor R1, a resistor R2, a capacitor Cm, a capacitor C1, a reference input voltage VREF and a bias voltage Vb1, an FVF module comprising error amplifiers M1 and M2, a switch tube M3 and a resistor RP, the circuit is switched on, and when the circuit is switched off, the FVF architecture-based efficient peak suppression quick response LDO voltage stabilizing circuit is switched on, the FVF architecture-based efficient peak suppression quick response LDO voltage stabilizing circuit is switched off. The output VOUTLDO of the LDO module, the switching tubes M1 and M2 and the power tube MP form a fast feedback path, if the output Iload of the LDO module changes rapidly, the output of the LDO module without the output capacitor generates large signal response, if the output Iload of the LDO module increases or decreases suddenly, the voltage of an output node VOUTLDO responds to current change rapidly through a voltage stabilizing circuit, and the output of the output node VOUTLDO generates large signal response. The change of the load current Iload is quickly responded, so that the output voltage is adjusted and kept stable.

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.

A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.

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.