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Low-power-consumption current-limiting circuit without operational amplifier

A technology of operational amplifiers and current-limiting circuits, applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as low precision and high power consumption, and achieve the effects of precise design, low power consumption, and power saving

Inactive Publication Date: 2011-05-11
NO 24 RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of low precision and high power consumption of traditional comparators, the present invention provides a low-power current-limiting circuit that does not require an operational amplifier, and the circuit of the present invention does not require an operational amplifier, and has a simple structure and is easy to use

Method used

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  • Low-power-consumption current-limiting circuit without operational amplifier
  • Low-power-consumption current-limiting circuit without operational amplifier
  • Low-power-consumption current-limiting circuit without operational amplifier

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Embodiment Construction

[0018] The specific implementation manners of the present invention are not limited to the following description, and are now further described in conjunction with the accompanying drawings.

[0019] The circuit principle diagram of the low power consumption current-limiting circuit that does not need the operation amplifier of the embodiment of the present invention is as figure 2 shown. The specific structure and connection relationship are the same as the content of the invention in this specification, and will not be repeated here.

[0020] figure 2 In, I B is a constant current source, Q N is an NPN power transistor, Q S with Q N common base and emitter, Q S and Q N The ratio of the emitter area is 1:N. When Q N turn-on, it is assumed that through Q N The current is I out , then Q S The current on the I out / N,Q S The current on will pass through the resistor R connected to its collector q , forming a voltage V at node B B , while flowing through R s Th...

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Abstract

The invention relates to a low-power-consumption current-limiting circuit without an operational amplifier. The low-power-consumption current-limiting circuit without the operational amplifier consists of a pair of matched resistors, a first current mirror, a second current mirror, a third current mirror, an NPN bipolar transistor matched with a power tube, and an NPN bipolar transistor with fixed base voltage. The low-power-consumption current-limiting circuit without the operational amplifier is novel and simple in structure, and low in power consumption due to elimination of the operational amplifier, and can realize that the power consumption of the whole circuit is below 20 microamperes; moreover, the current-limiting point of the circuit is determined by a ratio of instrument parameters instead of absolute values of the instrument parameters, so the current-limiting point is precise and free from influence of the temperature. The circuit can be widely applied to power management circuits in analogue integrated circuits, such as a singlechip DC-DC converter circuit adopting bipolar technology.

Description

technical field [0001] The invention relates to a current limiting circuit, in particular to a low power consumption current limiting circuit without an operational amplifier. Its direct application field is the power management circuit in analog integrated circuits, especially the monolithic DC-DC converter circuit based on bipolar technology. Background technique [0002] Although DC-DC converters have different topologies, all DC-DC converters require over-current protection. If there is no overcurrent protection function, when the load current suddenly increases, the power stage of the DC-DC converter will generate a lot of heat, resulting in local overheating and burning the device. Therefore, a perfect current-limiting protection function is particularly important to ensure long-term high reliability of DC-DC converter devices. [0003] At present, the common current limiting circuit of DC-DC converter based on bipolar process is as follows: figure 1 Shown (from lit...

Claims

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Application Information

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IPC IPC(8): H03F1/30
Inventor 谭旻付东兵黄晓宗胡永贵
Owner NO 24 RES INST OF CETC
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