Constant-current/constant-voltage DC-DC conversion system with external adjustable current-limiting function

A DC-DC and conversion system technology, applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc., can solve the problem of limiting the application of constant current/constant voltage DC-DC conversion system Development, non-adjustable current limit value, high design cost, etc., to achieve the effect of protecting normal operation, avoiding large current, and saving chip area

Inactive Publication Date: 2013-12-18
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, most of the traditional constant current / constant voltage DC-DC conversion systems with external adjustable current limiting function have complex structures and high design costs, and because the output voltage and current values ​​are fixed, the current limiting value cannot be adjusted, and can only be applied In specific occasions, it further limits the application and development of constant current / constant voltage DC-DC conversion systems with external adjustable current limiting function

Method used

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  • Constant-current/constant-voltage DC-DC conversion system with external adjustable current-limiting function
  • Constant-current/constant-voltage DC-DC conversion system with external adjustable current-limiting function
  • Constant-current/constant-voltage DC-DC conversion system with external adjustable current-limiting function

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Embodiment 1

[0063] The current limiting value IF and voltage limiting value VF of the system are set to 1A and 3.3V respectively, and the selected reference voltage VREF is 0.8V. Because the sampling resistance is very small, it can be seen from formula (7) that the critical value of the load resistance is 3.3Ω. When the load resistance R93.3Ω, the system works in constant voltage mode.

[0064] For the setting of the current limit value 1A: Since when OP1 is stable, the voltage at the R1 terminal is 0.8V, if the value of R1 is adjusted to 80KΩ, the current flowing through R1 is 10μA, when the value of n is 1, that is, M2 When it is an equal-proportion mirror image with M3, the current flowing through R2 is also 10μA. If the resistance value of R2 is set to 2.5KΩ, it can be obtained from formula (2), the value of VA is 25mV, and the selected current sampling resistor R10 is 25mΩ, then the setting of the output current limit value of 1A can be realized by formula (1). If you want to chan...

Embodiment 2

[0068] The current limiting value IF and voltage limiting value VF of the system are set to 1A and 3.3V respectively, and the selected reference voltage VREF is 0.8V. Because the sampling resistance is very small, it can be seen from formula (7) that the critical value of the load resistance is 3.3Ω. When the load resistance R93.3Ω, the system works in constant voltage mode.

[0069] For the setting of the current limit value 1A: Since when OP1 is stable, the voltage at the R1 terminal is 0.8V, if the value of R1 is adjusted to 80KΩ, the current flowing through R1 is 10μA, when the value of n is 1, that is, M2 When it is an equal-proportion mirror image with M3, the current flowing through R2 is also 10μA. If the resistance value of R2 is set to 2.5KΩ, it can be obtained from formula (2), the value of VA is 25mV, and the selected current sampling resistor R10 is 25mΩ, then the setting of the output current limit value of 1A can be realized by formula (1). If you want to chan...

Embodiment 3

[0073] The current limiting value IF and voltage limiting value VF of the system are set to 1A and 3.3V respectively, and the selected reference voltage VREF is 0.8V. Because the sampling resistance is very small, it can be seen from formula (7) that the critical value of the load resistance is 3.3Ω. When the load resistance R93.3Ω, the system works in constant voltage mode.

[0074] For the setting of the current limit value 1A: Since when OP1 is stable, the voltage at the R1 terminal is 0.8V, if the value of R1 is adjusted to 80KΩ, the current flowing through R1 is 10μA, when the value of n is 1, that is, M2 When it is an equal-proportion mirror image with M3, the current flowing through R2 is also 10μA. If the resistance value of R2 is set to 2.5KΩ, it can be obtained from formula (2), the value of VA is 25mV, and the selected current sampling resistor R10 is 25mΩ, then the setting of the output current limit value of 1A can be realized by formula (1). If you want to chan...

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Abstract

The invention discloses a constant-current / constant-voltage DC-DC conversion system with an external adjustable current-limiting function. The system comprises an external adjustable current-limiting circuit, a current error amplifying circuit, a voltage error amplifying circuit, an oscillator, a slope current sampling circuit, a PWM generating circuit, a logical driving circuit and an output circuit. The system can have the external adjustable current-limiting function due to the external adjustable current-limiting circuit, the current-limiting threshold value of the system can be accurately adjusted, the flexibility of application of the system is improved, a large current can be prevented from being generated in the no-load process of the system, and the normal operation of the circuits of the system can be effectively protected. The constant-current / constant-voltage DC-DC conversion system with the external adjustable current-limiting function is simple in structure, saves the area of chips, and is suitable for power supply chips with the accurate current-limiting requirements.

Description

technical field [0001] The invention belongs to the field of integrated circuit design and relates to a DC-DC conversion system, in particular to a constant current / constant voltage DC-DC conversion system with an external adjustable current limiting function. Background technique [0002] With the continuous development of power electronics technology, there are more and more types of electronic equipment, and the demand for power management chips continues to increase. The DC-DC switching power supply system has become an important part of the power supply solution due to its wide input voltage range, large driving capability and high conversion efficiency and many other advantages. [0003] A DC-DC conversion system is essentially a system that converts a DC voltage or current level into another controllable DC voltage or current level. The DC-DC conversion system with constant current / constant voltage function can not only provide a stable output voltage, but also accur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/32
Inventor 文常保贾亚飞李演明巨永锋许宏科温立民全思
Owner CHANGAN UNIV
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