CN219164219U

CN219164219U - 48V DC-DC reverse-filling delay driving discharging circuit for automobile

Info

Publication number: CN219164219U
Application number: CN202222428521.XU
Authority: CN
Inventors: 王鑫桃; 方雪鹏
Original assignee: Shenzhen Tianbangda Technology Co ltd
Current assignee: Shenzhen Tianbangda Technology Co ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2023-06-09
Anticipated expiration: 2032-09-14

Abstract

The utility model discloses a 48VDC-DC reverse-filling delay driving discharging circuit of an automobile, and relates to the technical field of power converters. The utility model comprises three switching tubes Q1, Q2 and Q3 and a triode Q4, wherein one end of the switching tube Q1 is connected with an input voltage and a driving voltage U1, and the other end of the switching tube Q1 is connected with an inductor L1. When the safe mos drive is turned off, Q4 is a P pipe, the lower end of D1 is low level, and Q4 is conducted. The Q3 grid electrode discharges to the source electrode, so that the effect of quick turn-off is achieved. If the discharge speed is too slow, the resistor can be connected in series with the Q4 collector electrode, so that the effect of accelerating discharge is achieved. According to the circuit, the quick turn-off effect can be achieved, and the element is protected.

Description

48V DC-DC reverse-filling delay driving discharging circuit for automobile

Technical Field

The utility model belongs to the technical field of power converters, and particularly relates to a 48V DC-DC reverse-filling delay driving discharging circuit of an automobile.

Background

In the working process of the conventional 48V DC-DC converter, after MOS drive is turned off, the phenomenon of 5ms delay is caused, a hardware drive circuit is turned off and delays 360uS, and the defects of overcurrent and 48V/12V overvoltage and undervoltage safety circuits cannot be effectively protected, as shown in figure 1, the phenomenon of reverse filling can occur when the battery is turned off and delays after full charge, so that components are damaged, the product cannot work normally, and the input and output related automobile parts are potentially damaged while the product is damaged.

In order to solve the problems, the utility model provides a 48V DC-DC reverse-filling delay driving discharging circuit of an automobile.

Disclosure of Invention

The utility model aims to provide a 48V DC-DC reverse-filling delay driving discharging circuit of an automobile, which solves the problem that the existing 48V DC-DC direct-current converter has a delay phenomenon of restarting for 5ms after MOS driving is turned off in the working process. The hardware driving circuit turns off the delay 360uS, and the defects of the overcurrent and 48V/12V overvoltage and undervoltage safety circuits cannot be effectively protected; the reverse filling phenomenon can occur when the battery is turned off after full charge, so that components and parts are damaged, the product cannot work normally, and the risk of potentially damaging input and output related automobile parts is caused when the battery is damaged.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model relates to an automobile 48V DC-DC reverse-filling delay driving discharge circuit, which comprises three switching tubes Q1, Q2 and Q3 and a triode Q4, wherein one end of the switching tube Q1 is connected with an input voltage and a driving voltage U1, and the other end of the switching tube Q1 is connected with an inductor L1;

one end of the switching tube Q2 is connected with the driving voltage U2 and the ground, the other end of the switching tube Q2 is connected with the inductor L1, and one end of the inductor L1 is connected with the switching tube Q3;

one end of the switching tube Q3 is connected between the output voltage inductor L1 and the switching tube Q3, a triode Q4 is connected between the switching tube Q3 and the switching tube Q3, a resistor R1 is connected to one end of the triode Q4, a diode D1 is arranged between the triode Q4 and the resistor R1, and the diode D1 is arranged on the switching tube Q3.

Further, the triode Q4 is a PNP triode.

Further, the switching tubes Q1, Q2 and Q3 are N-MOS tubes.

The utility model has the following beneficial effects:

1. during normal operation, the safe mos drive is normally opened by driving the Q3 through the D1, the voltage of the base electrode of the Q4 is high, the Q4 is not conducted, and the Q3 drive is not affected.

2. When the safe mos drive is turned off, Q4 is a P pipe, the lower end of D1 is low level, and Q4 is conducted. The Q3 grid electrode discharges to the source electrode, so that the effect of quick turn-off is achieved. If the discharge speed is too slow, the resistor can be connected in series with the Q4 collector electrode, so that the effect of accelerating discharge is achieved. According to the circuit, the quick turn-off effect can be achieved, and the element is protected.

Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments 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 that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a circuit diagram of the present utility model;

fig. 2 is a schematic diagram of a circuit structure of a safetymos drive in 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.

In the description of the present utility model, it should be understood that the terms "upper," "middle," "outer," "inner," and the like indicate an orientation or a positional relationship, and are merely for convenience of describing the present utility model and simplifying the description, but do not indicate or imply that the components or elements 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 utility model.

Referring to fig. 1-2, the utility model discloses a 48V DC-DC reverse-filling delay driving discharging circuit of an automobile, which comprises three switching tubes Q1, Q2, Q3 and a triode Q4, wherein one end of the switching tube Q1 is connected with an input voltage and a driving voltage U1, and the other end of the switching tube Q1 is connected with an inductor L1;

Transistor Q4 is a PNP transistor.

The switching tubes Q1, Q2 and Q3 are N-MOS tubes.

As shown in fig. 1-2, the present embodiment is a method for using a 48V DC-DC reverse-filling delay driving discharging circuit of an automobile: during normal operation, the safe mos drive drives Q3 to normally open through D1, the base voltage of Q4 is high, Q4 is not conducted, and the Q3 drive is not affected;

when the safetymos drive is turned off, Q4 is a P pipe, the lower end of D1 is low level, and Q4 is turned on. The Q3 grid electrode discharges to the source electrode, so that the effect of quick turn-off is achieved. If the discharge speed is too slow, the resistor can be connected in series with the Q4 collector electrode, so that the effect of accelerating discharge is achieved. According to the circuit, the quick turn-off effect can be achieved, and the element is protected.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.

Claims

1. The utility model provides a 48V DC-DC reverse irrigation time delay drive discharge circuit of car, includes three switch tube Q1, Q2, Q3 and triode Q4, its characterized in that: one end of the switching tube Q1 is connected with the input voltage and the driving voltage U1, and the other end of the switching tube Q1 is connected with the inductor L1;

2. The 48V DC-DC reverse-filling delay driven discharging circuit for automobile according to claim 1, wherein said triode Q4 is a PNP triode.

3. The 48V DC-DC reverse-filling delay driving discharging circuit of the automobile according to claim 1, wherein the switching tubes Q1, Q2 and Q3 are N-MOS tubes.