CN212846536U

CN212846536U - Pre-modulation circuit for reducing power supply influence

Info

Publication number: CN212846536U
Application number: CN202022414287.6U
Authority: CN
Inventors: 郭虎; 李建伟; 王照新; 蔡彩银
Original assignee: Beijing Yanhuang Guoxin Technology Co ltd
Current assignee: Beijing Yanhuang Guoxin Technology Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-03-30
Anticipated expiration: 2030-10-27

Abstract

The utility model discloses a pre-modulation circuit for reducing power influence, include: the circuit comprises a power supply voltage, a capacitor, a first transistor, a second transistor, a first resistor, a second resistor and a third resistor; the base electrode of the first transistor is respectively connected with one end of a first resistor and one end of a second resistor, the collector electrode of the first transistor is respectively connected with one end of a third resistor and the base electrode of a second transistor, and the emitter electrode of the first transistor is grounded; the circuit increases the adaptability of a subsequent functional circuit, reduces the number of voltage conversion chips required in a system and reduces the cost of the circuit under the condition of realizing the same voltage protection function.

Description

Pre-modulation circuit for reducing power supply influence

Technical Field

The utility model relates to an integrated circuit safety field, concretely relates to a pre-modulation circuit for reducing power influence.

Background

The integrated circuit has the advantages of small volume, light weight, few lead wires and welding points, long service life, high reliability, good performance and the like, and is low in cost and convenient for large-scale production. It is widely used not only in industrial and civil electronic equipment such as radio recorder, TV set, computer, etc., but also in military, communication, remote control, etc. The integrated circuit is used to assemble electronic equipment, the assembling density can be improved by dozens of times to thousands of times compared with the transistor, and the stable working time of the equipment can be greatly improved

The power supply of the current integrated circuit (chip) is sometimes higher than the maximum voltage that the internal device can receive, which may cause the function of the internal circuit to be abnormal or damaged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pre-modulation circuit for reducing power influence to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a pre-modulation circuit for reducing power supply effects, comprising: the circuit comprises a power supply voltage, a capacitor, a first transistor, a second transistor, a first resistor, a second resistor and a third resistor;

the base electrode of the first transistor is respectively connected with one end of a first resistor and one end of a second resistor, the collector electrode of the first transistor is respectively connected with one end of a third resistor and the base electrode of a second transistor, and the emitter electrode of the first transistor is grounded; the collector of the second transistor is respectively connected with a power supply voltage and the other end of the third resistor; the other end of the third resistor is connected with a power supply voltage; the emitter of the second transistor is respectively connected with the other end of the first resistor and outputs voltage, and the other end of the second resistor is grounded;

the first transistor is connected with a capacitor in parallel.

Preferably, the first transistor and the second transistor both use: and a triode.

Preferably, the triode adopts: an NPN type triode.

Preferably, the first transistor and the second transistor both use: a field effect transistor or a MOS transistor.

Preferably, the first resistor, the second resistor and the third resistor are all adjustable resistors.

Compared with the prior art, the beneficial effects of the utility model are that: when the power supply voltage is too high, the currents of the first resistor and the second resistor are increased, so that the first transistor is turned on, the current flowing through the third resistor is greatly increased, the current flowing through the second transistor is reduced, and finally, an output voltage lower than the power supply voltage is output to meet the circuit requirement; the range and the amplitude of the preset value voltage can be changed by adjusting the resistance values of the first resistor, the second resistor and the third resistor; the adaptability of the subsequent functional circuit is increased, the number of voltage conversion chips needed in the system is reduced under the same voltage protection function, and the cost of the circuit is reduced.

Drawings

Fig. 1 is a circuit connection diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A pre-modulation circuit for reducing power supply effects, comprising: the circuit comprises a power supply voltage Vi, a capacitor C, a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2 and a third resistor R3;

the base of the first transistor Q1 is respectively connected with one end of a first resistor R1 and one end of a second resistor R2, the collector of the first transistor Q1 is respectively connected with one end of a third resistor R3 and the base of a second transistor Q2, and the emitter of the first transistor Q1 is grounded; the collector of the second transistor Q2 is respectively connected with the power supply voltage Vi and the other end of the third resistor R3; the other end of the third resistor R3 is connected with a power supply voltage Vi; the emitters of the second transistor Q2 are respectively connected with the other end of the first resistor R1 and output voltage V _ PRE, and the other end of the second resistor R2 is grounded;

the application provides a pre-modulation circuit's operating principle for reducing power supply influence is that, the electric current of first resistance and second resistance increases when mains voltage is too high for first transistor opens, and the electric current that flows through third resistance increases by a wide margin, thereby makes the electric current that flows through the second transistor reduce, finally outputs an output voltage that is lower than mains voltage.

The first transistor Q1 is connected in parallel with a capacitor C, and the capacitor C can perform safety protection on the first transistor Q1.

Preferably, the first transistor Q1 and the second transistor Q2 both adopt: and a triode.

Preferably, the triode adopts: an NPN type triode.

It should be noted that the collector current cannot be increased indefinitely because of the limitation of the resistance Rc (Rc is a fixed value, then the maximum current is U/Rc, where U is the supply voltage). When the base current is increased and the collector current cannot be increased continuously, the triode enters a saturation state. The general criterion for judging whether the triode is saturated is as follows: ib β > Ic. After the transistor enters the saturation state, the voltage between the collector and the emitter of the transistor will be small, which is understood as a switch being closed. Thus, the triode can be used as a switch: when the base current is 0, the collector current of the triode is 0 (which is called triode cut-off), which is equivalent to switch-off; when the base current is so large that the triode is saturated, the switch is closed, and the triode is a switch tube.

Preferably, the first transistor Q1 and the second transistor Q2 both adopt: a field effect transistor or a MOS transistor.

It should be noted that other elements may be used for the transistor in the present application, and the present application is not limited herein to realize the same voltage protection function.

Preferably, the first resistor R1, the second resistor R2 and the third resistor R3 are all adjustable resistors.

It should be noted that, in the present application, the range and the amplitude of the preset value voltage can be changed by adjusting the resistance values of the first resistor, the second resistor, and the third resistor.

The first resistor R1, the second resistor R2 and the third resistor R3 are all grounded.

To sum up, the utility model provides a pair of a premodulation circuit for reducing power influence leads to the adaptability that has increased follow-up function circuit, realizes under the same voltage protection function, reduces the quantity of the voltage conversion chip that needs in the system, reduces the cost of circuit.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A pre-modulation circuit for reducing power supply effects, comprising: the circuit comprises a power supply voltage, a capacitor, a first transistor, a second transistor, a first resistor, a second resistor and a third resistor;

the first transistor is connected with a capacitor in parallel.

2. A pre-modulation circuit for reducing power supply impact according to claim 1, wherein the first transistor and the second transistor each employ:

and a triode.

3. A pre-modulation circuit for reducing power supply effects according to claim 2, wherein the transistor employs:

an NPN type triode.

4. A pre-modulation circuit for reducing power supply impact according to claim 1, wherein the first transistor and the second transistor each employ:

a field effect transistor or a MOS transistor.

5. The pre-modulation circuit according to claim 1, wherein the first resistor, the second resistor, and the third resistor are adjustable resistors.