CN215580895U

CN215580895U - Power output overshoot improvement circuit

Info

Publication number: CN215580895U
Application number: CN202121307535.5U
Authority: CN
Inventors: 刘星光; 唐玄; 李光辉
Original assignee: Shenzhen Faithtech Co ltd
Current assignee: Shenzhen Faithtech Co ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-01-18
Anticipated expiration: 2031-06-11

Abstract

The utility model discloses a power output overshoot improvement circuit which comprises a comparator U1 and a comparator U2, wherein a pin 6 of the comparator U1 is electrically connected with a power set reference voltage Vref, a pin 5 of the comparator U1 is electrically connected with one end of a resistor R2 and one end of a resistor R1, the other end of the resistor R2 is grounded, the other end of the resistor R1 is electrically connected with a power output voltage Vo, a pin 7 of the comparator U1 is electrically connected with a pin 5 of a comparator U2, a pin 6 of the comparator U2 is electrically connected with one end of a resistor R3 and a source electrode of a switch tube Q1, the other end of the resistor R3 is grounded, a grid electrode of the switch tube Q1 is electrically connected with the pin 7 of the comparator U2, and a drain electrode of the switch tube Q1 is electrically connected with the power output voltage Vo. The utility model can effectively reduce the overshoot amplitude and the overshoot time, thereby effectively improving the output overshoot phenomenon of the voltage.

Description

Power output overshoot improvement circuit

Technical Field

The utility model relates to the technical field of dynamic response of power supply circuits, in particular to a power supply output overshoot improvement circuit.

Background

When a power supply, especially a switching power supply, outputs, overshoot of the power supply can exist under certain conditions (such as unloading, full load to light load), the overshoot of the power supply is an important index of the power supply characteristic, and if the overshoot time is long and the overshoot amplitude is large, abnormal or damaged load operation can be caused, so that a power supply output overshoot improvement circuit is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a power supply output overshoot improvement circuit.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a power output overshoot improvement circuit comprises a comparator U1 and a comparator U2, wherein a pin 6 of the comparator U1 is electrically connected with a power set reference voltage Vref, a pin 5 of the comparator U1 is electrically connected with one end of a resistor R2 and one end of a resistor R1, the other end of the resistor R2 is grounded, the other end of the resistor R1 is electrically connected with a power output voltage Vo, a pin 7 of the comparator U1 is electrically connected with a pin 5 of a comparator U2, the pin 6 of the comparator U2 is electrically connected with one end of a resistor R3 and a source electrode of a switch tube Q1, the other end of the resistor R3 is grounded, a grid electrode of the switch tube Q1 is electrically connected with the pin 7 of the comparator U2, and a drain electrode of the switch tube Q1 is electrically connected with the power output voltage Vo.

Preferably, the voltage input terminal of the comparator U1 is electrically connected to a high level, and the ground terminal of the comparator U1 is grounded.

Preferably, the voltage input terminal of the comparator U2 is electrically connected to a high level, and the ground terminal of the comparator U2 is grounded.

Preferably, the switching tube Q1 is a MOS field effect transistor.

The utility model can effectively reduce the overshoot amplitude and the overshoot time, thereby effectively improving the output overshoot phenomenon of the voltage.

Drawings

Fig. 1 is a circuit diagram of a power supply output overshoot improvement circuit according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1, a power output overshoot improvement circuit includes a comparator U1 and a comparator U2, a voltage input terminal of the comparator U1 is electrically connected to a high level, a ground terminal of the comparator U1 is grounded, a pin 6 of the comparator U1 is electrically connected to a power set reference voltage Vref, a pin 5 of the comparator U1 is electrically connected to one end of a resistor R2 and one end of a resistor R1, the other end of the resistor R2 is grounded, the other end of the resistor R1 is electrically connected to a power output voltage Vo, a pin 7 of the comparator U1 is electrically connected to a pin 5 of a comparator U2, a voltage input terminal of the comparator U2 is electrically connected to a high level, a ground terminal of the comparator U2 is grounded, a pin 6 of the comparator U2 is electrically connected to one end of a resistor R3 and a source of a switch Q1, the other end of the resistor R3 is grounded, a gate of the switch Q1 is electrically connected to a pin 7 of the comparator U2, and a drain of the switch Q1 is electrically connected to a power output voltage, the switching tube Q1 is a MOS field effect tube, the overshoot amplitude can be effectively reduced, the overshoot time can be effectively shortened, and the output overshoot phenomenon of the voltage can be effectively improved.

In the utility model, when the power supply works normally, the reference voltage Vref set by the power supply is higher than the output voltage Vo of the power supply, and the error signal output by the comparator U1 is negative, so that a load circuit consisting of the comparator U2, the switch tube Q1 and the resistor R1 is closed, and the influence on the power supply is not generated;

when the power output voltage Vo is overshot, the power set reference voltage Vref is lower than the power output voltage Vo, and an error signal output by the comparator U1 is inverted, so that a load circuit consisting of the comparator U2, the switch tube Q1 and the resistor R1 is started, the power output voltage Vo is quickly pulled down, a set value is restored, the overshoot amplitude and the overshoot time are reduced, and the output overshoot of the power is improved.

In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. A power output overshoot improvement circuit comprises a comparator U1 and a comparator U2, and is characterized in that a pin 6 of the comparator U1 is electrically connected with a power set reference voltage Vref, a pin 5 of the comparator U1 is electrically connected with one end of a resistor R2 and one end of a resistor R1, the other end of the resistor R2 is grounded, the other end of the resistor R1 is electrically connected with a power output voltage Vo, a pin 7 of the comparator U1 is electrically connected with a pin 5 of a comparator U2, a pin 6 of the comparator U2 is electrically connected with one end of a resistor R3 and a source of a switch tube Q1, the other end of the resistor R3 is grounded, a gate of the switch tube Q1 is electrically connected with the pin 7 of the comparator U2, and a drain of the switch tube Q1 is electrically connected with the power output voltage Vo.

2. The power supply overshoot improvement circuit according to claim 1, wherein the voltage input terminal of the comparator U1 is electrically connected to a high level, and the ground terminal of the comparator U1 is grounded.

3. The power supply overshoot improvement circuit according to claim 1, wherein the voltage input terminal of the comparator U2 is electrically connected to a high level, and the ground terminal of the comparator U2 is grounded.

4. The power supply output overshoot improvement circuit according to claim 1, wherein the switching transistor Q1 is a MOS field effect transistor.