Linear voltage converter and power supply system with low voltage input and wide load output

A linear voltage, low voltage input technology, used in output power conversion devices, DC power input conversion to DC power output, control/regulation systems, etc. device performance and other issues to achieve the effect of improving performance

Active Publication Date: 2021-03-16
SHENZHEN ICOMM SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a linear voltage converter and power supply system with low voltage input and wide load output, so as to solve the problem in the prior art that the transmission MOS tube is in the subcritical region ( sub-threshold), so that the error amplifier cannot provide enough gain, and the overall open-loop gain will decrease, which is a technical problem that affects the performance of the linear voltage converter

Method used

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  • Linear voltage converter and power supply system with low voltage input and wide load output
  • Linear voltage converter and power supply system with low voltage input and wide load output
  • Linear voltage converter and power supply system with low voltage input and wide load output

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Embodiment 1

[0033] The present invention provides a linear voltage converter with low voltage input and wide load output, such as Figure 5-7 As shown, including the core level and the output level, the core level and the output level are the core level Figure 5 in the LDO output stage and the LDO core stage. The core level is converted by the switching power converter (DC-DC, that is, the DC switching power converter) to the voltage V OUT is powered, that is, V OUT It is connected to the positive power supply terminal of the error amplifier A1, and the voltage of the LDO is stably output through the error amplifier A1 and connected to the output stage, and the output stage is connected to the load and supplies power to it. The linear voltage converter also includes an output stage sensor, a comparator and a power switch; the output stage sensor can detect the output voltage or current of the output stage (when detecting the current, it needs to be converted into a voltage signal for c...

Embodiment 2

[0038] Such as Figure 8-9 As shown, the difference from embodiment 1 is characterized in that the number of transmission MOS tubes is more than 2 ( Figure 9 There are two in the middle, that is, the first transmission MOS tube and the second transmission MOS tube), and they are connected in parallel to form a transmission MOS tube array. The more transmission MOS tubes, the easier it is to realize the V O For accurate control of the voltage range, the parameters of each transmission MOS tube connected in parallel are preferably consistent; at the same time, the control signal adjusts the working state of the PMOS tube MP2 by adjusting the number of connected transmission MOS tubes. When the load is small, the output of the comparator is low Only one or a few transmission MOS transistors are turned on (when the number of transmission MOS transistors in the transmission MOS transistor array in the circuit is more than three) transmission MOS transistors, that is, one or a sm...

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Abstract

The invention provides a linear voltage converter and power supply system with low-voltage input and wide-load output, relates to the technical field of power supply management, and solves the problem that the transmission MOS tube makes the error amplifier unable to provide sufficient gain under the load of extremely small power or no power technical problem. The linear voltage converter includes an output stage sensor and a comparator; the transmission MOS transistor of the output stage is one or multiple in parallel; the output stage sensor can detect the output voltage or current of the output stage to obtain the detection result of the voltage signal, and the output stage sensor Connected to the comparator, the comparator compares the detection result with the detection reference voltage and generates different control signals, the control signal can switch the power supply of the core stage to the input voltage V of the battery into the switching power converter IN , or adjust the access number of transmission MOS tubes. The invention ensures that the operation of the core stage is in a proper range under the load of very small power or no power, and improves the performance of the linear voltage converter.

Description

technical field [0001] The invention relates to the technical field of power supply management, in particular to a linear voltage converter with low-voltage input and wide-load output and a power supply system. Background technique [0002] With the rapid development of wireless communication technology systems, it is increasingly urgent to develop low-cost, high-efficiency, and low-power radio frequency integrated circuits. At present, the world is entering an Internet of Things (IoT) where various systems need to collect and exchange data. ) era, in the Internet of Things where sensors transmit data wirelessly, low-power WiFi plays a vital role if the sensor is powered by batteries, has limited power consumption and must last for a long time. Such as figure 1 As shown, in SoC (System on Chip, system-on-chip) power architecture, LDO (low dropout regulator), as a low dropout linear regulator, is more and more commonly used. In order to improve the overall power conversion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584H02M1/0025H02M1/0045
Inventor 庄文贤余岱原邱伟茗
Owner SHENZHEN ICOMM SEMICON CO LTD
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