Linear regulated power supply

A technology of linear regulated power supply and linear regulated circuit, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems affecting the normal use of MOS tubes, reducing the reliability of MOSFETs, shortening the service life of linear power supplies, etc.

Active Publication Date: 2020-06-19
SHENZHEN CITY SIGLENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the current sharing effect is not good, the temperature rise of one MOS tube is extremely high and the other MOS tube may not work, whic

Method used

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  • Linear regulated power supply
  • Linear regulated power supply
  • Linear regulated power supply

Examples

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Embodiment 1

[0038] Please refer to figure 2 , is a schematic circuit structure diagram of a linear regulated power supply in an embodiment, including a linear regulated power supply 1 and a load circuit 2 , wherein the linear regulated power supply 1 includes a current sharing control circuit 10 . The current sharing control circuit 10 responds to the analog control signal Vctrl of the linear regulated power supply 1 , and linearly outputs a stable voltage, which is used as the output of the linear regulated power supply 1 to the load circuit 2 . The current sharing control circuit 10 includes at least one current sharing control unit 11 . The current sharing control unit 11 responds to the analog control signal Vctrl and linearly outputs a stable voltage as the output of the current sharing control circuit 10 . The current sharing control unit 11 includes a driving voltage adjusting circuit 111 , a linear voltage stabilizing circuit 112 and a feedback circuit 113 . The linear voltage s...

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PUM

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Abstract

The invention discloses a linear voltage-stabilizing power supply which comprises a current-sharing control circuit. The current sharing control circuit comprises at least one current sharing controlunit, and each current sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit, wherein the feedback circuit is used for feedingback the voltage of a current sampling resistor of the linear voltage stabilizing circuit to the driving voltage adjusting circuit; the driving voltage adjusting circuit adjusts the current of the analog control signal Vctrl input into the current sharing control unit according to the voltage value of the current sampling resistor and then outputs the adjusted current to the linear voltage stabilizing circuit, so that the output power of the linear voltage stabilizing circuit is adjusted by adjusting the voltage of the current sampling resistor. Due to the fact that the output power of the linear voltage stabilizing circuit of each current sharing control unit can be adjusted, the problem that the linear voltage stabilizing power supply is uneven in current is solved, stability of the linear voltage stabilizing power supply is improved, and the service life of the linear voltage stabilizing power supply is prolonged.

Description

technical field [0001] The invention relates to the technical field of CMOS integrated circuit design, in particular to a linear regulated power supply. Background technique [0002] Power MOSFET is a power device commonly used in switching converters, and its loss has a direct impact on the performance and efficiency of switching converters. The loss of power MOSFET is mainly composed of two parts: switching loss and conduction loss. Usually we will choose a power MOSFET with low on-resistance, high withstand voltage, high gain, low switching loss, and low gate threshold voltage. But for devices that need to work in linear mode, such as active loads, the above principles are not applicable. Because if the gain of the power MOSFET is too high, considering that its gate threshold voltage has a negative temperature coefficient, it is difficult to keep the drain current constant without applying a negative feedback link, and it may even cause permanent damage to the power MOS...

Claims

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Application Information

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IPC IPC(8): G05F1/625
CPCG05F1/625
Inventor 危洪兵钱柏年周云海
Owner SHENZHEN CITY SIGLENT TECH
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