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A kind of protection circuit and method

A technology for protecting circuits and circuits, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as damage to active switching devices of boost circuits, and achieve the effect of preventing damage.

Active Publication Date: 2019-12-06
芯洲科技(北京)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are inherent defects in the boost circuit: there is a direct circuit from input to output in the boost circuit. When the output terminal is seriously over-current or short-circuited, the direct circuit will generate a huge current, and this huge current will damage the boost. Active switching devices or passive devices such as inductors in the circuit

Method used

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  • A kind of protection circuit and method
  • A kind of protection circuit and method
  • A kind of protection circuit and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The protection circuit provided by this embodiment is applied to a boost circuit, and the boost circuit is provided with an input-to-output through circuit formed by the parasitic diode of the first switch, such as image 3 As shown, the circuit includes: an overcurrent detection circuit 31, a first control circuit 32, and a second switch 33; among them,

[0041] The overcurrent detection circuit 31 samples the first current flowing through the first switch; and detects whether the first current meets a first condition; when the first current meets the first condition, the The first control circuit 32 outputs a first control signal to the second switch 33; the second switch 33 turns off the through circuit in response to the first control signal.

[0042] Here, the first condition indicates that the output current of the boost circuit is overcurrent.

[0043] In the embodiment of the present invention, the boost circuit is provided with an input-to-output through circuit forme...

Embodiment 2

[0072] This example is Figure 5 A specific application example of the circuit shown.

[0073] In this embodiment, as Image 6 As shown, the boost circuit 61 includes: an inductor L, a MOS transistor Q1, a MOS transistor Q2, an input terminal capacitor Cin, and an output terminal capacitor Cout1;

[0074] The over-current detection circuit (OC) 31 samples the current flowing through the MOS transistor Q2 and judges whether it is over-current;

[0075] The first control circuit 32 includes a PMOS logic control circuit (PMOS Control);

[0076] The second switch 33 includes a PMOS transistor Q3;

[0077] The second control circuit 34 includes a resistor R1, a resistor R2, an error operational amplifier EA0, a comparator Comp1, a first SR latch SR1, a pulse width modulation (PWM) logic control circuit (PWM Control), and an inverter INV1. The resistor R1, the resistor R2, the error operational amplifier EA0, the comparator Comp1, and the first SR latch SR1 form a current loop negative feedb...

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PUM

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Abstract

The invention discloses a protection circuit which is applied to a boost circuit. An input-to-output straight circuit formed by a parasitic diode of a first switch is arranged on the boost circuit. The protection circuit comprises an over-current detection circuit, a first control circuit and a second switch. The over-current detection circuit is configured to sample first current flowing through the first switch and detect whether the first current satisfies a first condition, wherein the first condition represents that over-current occurs in the output current of the boost circuit. The first control circuit is configured to output a first control signal to the second switch when the first current satisfies the first condition. The second switch is configured to respond to the first control signal to disconnect the straight circuit. The invention also discloses a protection method.

Description

Technical field [0001] The invention relates to a boost circuit, in particular to a protection circuit and method. Background technique [0002] With the advancement of circuit electronics technology, switching power supplies continue to develop toward high power density, high efficiency, and high reliability. The protection function of switching power supplies has become an important indicator of reliability. [0003] As a basic topology of switching power supply, boost circuit can be applied to non-isolated products, and the power density and efficiency can be made very high. However, the boost circuit has inherent defects: there is a through circuit from input to output in the boost circuit. When the output terminal is severely over-current or short-circuited, the through circuit will generate a huge current, and this huge current will damage the boost Active switching devices or passive devices such as inductors in the circuit. [0004] Therefore, how to control the damage to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02H3/087
CPCH02H3/087H02H7/1227
Inventor 张树春李润德徐小珺
Owner 芯洲科技(北京)股份有限公司