CN218920041U

CN218920041U - Scalable load circuit applied to output voltage regulation

Info

Publication number: CN218920041U
Application number: CN202223609697.1U
Authority: CN
Inventors: 贺凯建; 王永彬; 李晓刚
Original assignee: Shenzhen Maite Power Technology Co ltd
Current assignee: Shenzhen Maite Power Technology Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-04-25
Anticipated expiration: 2032-12-30

Abstract

The utility model discloses a scalable load circuit applied to output voltage regulation, which is connected between a USB charging circuit and a main circuit of a charger, and comprises a first switch unit, a second switch unit and a plurality of load resistors, wherein the first switch unit is respectively connected with the USB charging circuit, the load resistors and the second switch unit, one ends of the load resistors are connected with the main circuit, and the first switch unit is used for leading at least one load resistor to be conducted into the main circuit when the output voltage of the USB charging circuit is larger than the conduction voltage of the USB charging circuit, and leading the rest load resistor to be conducted into the main circuit when the output voltage of the USB charging circuit is larger than the conduction voltage of the second switch unit. According to the utility model, by arranging the first switch unit, the second switch unit and the plurality of load resistors, when the output of the USB charging circuit is different, the voltage is stable when the main circuit 5V is output, and the dummy load is stopped when the 9V, 12V, 15V and 20V stand by, so that the loss is reduced.

Description

Scalable load circuit applied to output voltage regulation

Technical Field

The utility model relates to the field of power supplies, in particular to a scalable load circuit applied to output voltage regulation.

Background

Nowadays, electronic devices with batteries are various in variety, such as mobile phones, notebook computers and other electronic products used in daily life, and the electronic devices are not separated from the charging device. Along with the improvement of the material culture life of people, individuals have a plurality of mobile equipment for electricity consumption such as mobile phones, tablet computers or notebook computers, and the like, and the output demands of chargers are increasing.

The existing quick charger inputs from 220V to 5-20V output, generally goes through an AC-DC circuit (alternating current is converted into direct current), a main circuit, a direct current conversion circuit, a quick charging communication circuit and an output circuit, wherein the output voltage of the output circuit is determined by the main circuit, but the main circuit is determined by sampling the output circuit or interacting with the quick charging communication circuit, the process is possibly delayed and inaccurate, the voltage is unstable when the output is not 5V, and the loss is large when the standby is 9V, 12V, 15V and 20V.

Disclosure of Invention

It is an object of the present utility model to provide a scalable load circuit for output voltage regulation.

In order to achieve the above purpose, the following technical scheme is adopted:

the utility model provides a be applied to scalable load circuit of output voltage regulation, is connected between USB charging circuit and the steady voltage output circuit of main circuit of charger, includes first switch unit, second switch unit, a plurality of load resistance, first switch unit respectively with USB charging circuit, load resistance and second switch unit are connected, a plurality of load resistance's one end all is connected with the main circuit, first switch unit is used for making at least one when USB charging circuit's output voltage is greater than its turn-on voltage load resistance switches on to in the main circuit, simultaneously when USB charging circuit's output voltage is greater than the turn-on voltage of second switch unit makes remaining load resistance switches on to in the main circuit.

Further, the first switch unit and the second switch unit respectively comprise a first triode and a second triode, and the plurality of load resistors at least comprise a first load resistor, a second load resistor and a third load resistor.

Further, one end of the first load resistor, one end of the second load resistor and one end of the third load resistor are connected to the main circuit, the base of the first triode is connected to the USB charging circuit, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected to the other end of the first load resistor and the base of the second triode, and the collecting electrode of the second triode is connected to the second load resistor and the other end of the third load resistor, and the emitting electrode of the second triode is grounded.

Further, a protection resistor is arranged between the base stage of the first triode and the USB charging circuit, and a grounding resistor is further extended between the protection resistor and the base stage of the triode.

By adopting the scheme, the utility model has the beneficial effects that:

by arranging the first switch unit, the second switch unit and the plurality of load resistors, when the output of the USB charging circuit is different, the voltage is stable when the main circuit 5V is output, and the dummy load is stopped when the 9V, 12V, 15V and 20V stand by, so that the loss is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic circuit diagram of an output voltage regulator circuit according to an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of a main circuit and a USB charging circuit according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, a scalable load circuit for output voltage regulation is connected between a USB charging circuit of a charger and a regulated output circuit of a main circuit 1, and includes a first switch unit 31, a second switch unit 32, and a plurality of load resistors, where the first switch unit 31 is respectively connected to the USB charging circuit, the load resistor, and the second switch unit 32, and one ends of the plurality of load resistors are connected to the main circuit 1, and the first switch unit 31 is configured to enable at least one load resistor to be turned on to the main circuit 1 when an output voltage of the USB charging circuit is greater than a turn-on voltage of the second switch unit 32, and enable the rest of load resistors to be turned on to the main circuit 1 when the output voltage of the USB charging circuit is greater than the turn-on voltage of the second switch unit 32.

Specifically, the first switching unit 31 and the second switching unit 32 include a first transistor Q9 and a second transistor Q7, respectively, and the plurality of load resistors include at least a first load resistor R41, a second load resistor R49, and a third load resistor R50. One end of the first load resistor R41, the second load resistor R49 and the third load resistor R50 is connected to the main circuit 1, the base of the first triode Q9 is connected to the USB charging circuit, the emitter thereof is grounded, the collector thereof is connected to the other end of the first load resistor R41 and the base of the second triode Q7, the collector of the second triode Q7 is connected to the other ends of the second load resistor R49 and the third load resistor R50, and the emitter thereof is grounded. A protection resistor R47 is arranged between the base of the first triode Q9 and the USB charging circuit, and a grounding resistor R52 also extends between the protection resistor R47 and the base of the triode.

When the output voltage VBUS of the USB charging circuit rises to a certain value, the base electrode of the first triode Q9 works, so that the collector electrode and the emitter electrode of the first triode Q9 are turned on, and the base electrode voltage of the second triode Q7 is required to be pulled down to be inactive, and the dummy loads R49 and R50 withdraw from the work. When VBUS drops to a more constant value, where the base voltage of the first transistor Q9 drops by a constant value, Q9 does not operate, and v+ breaks down the second transistor Q7 through R41, then dummy load resistor R49 and resistor R50 conduct.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The utility model provides a be applied to scalable load circuit of output voltage regulation, is connected between USB charging circuit and the steady voltage output circuit of main circuit of charger, its characterized in that includes first switch unit, second switch unit, a plurality of load resistance, first switch unit respectively with USB charging circuit, load resistance and second switch unit are connected, a plurality of load resistance's one end all is connected with the main circuit, first switch unit is used for when the output voltage of USB charging circuit is greater than its turn-on voltage makes at least one load resistance switch on to in the main circuit, simultaneously when the output voltage of USB charging circuit is greater than the turn-on voltage of second switch unit makes remaining load resistance switch on to in the main circuit.

2. The scalable load circuit of claim 1 wherein the first and second switching units comprise first and second transistors, respectively, and the plurality of load resistors comprises at least a first load resistor, a second load resistor, and a third load resistor.

3. The scalable load circuit of claim 2 wherein one end of the first, second, and third load resistors is connected to the main circuit, the base of the first transistor is connected to the USB charging circuit, the emitter is grounded, the collector is connected to the other end of the first load resistor and the base of the second transistor, and the collector of the second transistor is connected to the other ends of the second and third load resistors, and the emitter is grounded.

4. The scalable load circuit of claim 3 wherein a protection resistor is disposed between the base of the first transistor and the USB charging circuit, and a ground resistor further extends between the protection resistor and the base of the transistor.