阅读说明：本技术 一种boost升压电路 (Boost circuit ) 是由 张经宇 陈哨东 于 2019-10-16 设计创作，主要内容包括：一种boost升压电路,该电路包括定时器555电路、推挽式开关电路、3.3V逻辑电平变化基准电路、微型功率电感、输出二极管、保护电路以及输出接口；定时器555电路和推挽式开关电路连接；推挽式开关电路和微型功率电感连接；3.3V逻辑电平变换基准电路与保护电路连接；输入电压、微型功率电感、输出二极管、保护电路与输出接口顺次连接。本发明采用了定时器555来设计boost升压电路,在硬件上实现,不需要软件参与,占用PCB面积小于2cm<Sup>2</Sup>,高度不到2mm,由单片机、CPLD等器件的I0端口控制高压侧的输出接口模块,电路可靠,速度可以达到μs级别。外围负载电路存在短路和过载时,可以断开输出接口模块对boost升压电路进行保护。(A boost circuit comprises a timer 555 circuit, a push-pull switch circuit, a 3.3V logic level change reference circuit, a micro power inductor, an output diode, a protection circuit and an output interface; the timer 555 circuit is connected with the push-pull switch circuit; the push-pull switch circuit is connected with the micro power inductor; the 3.3V logic level conversion reference circuit is connected with the protection circuit; the input voltage, the miniature power inductor, the output diode, the protection circuit and the output interface are sequentially connected. The boost circuit is designed by adopting the timer 555, is realized on hardware, does not need software participation, and occupies less than 2cm of PCB area 2 The height is less than 2mm, the I0 port of the device such as the singlechip, the CPLD and the like controls the output interface module at the high-voltage side, the circuit is reliable, and the speed can reach the mu s level. When the peripheral load circuit has short circuit and overload, the output interface module can be disconnected to protect the boost circuit.)

1. A boost circuit is characterized in that the circuit comprises a timer 555 circuit, a push-pull switch circuit, a 3.3V logic level change reference circuit, a micro power inductor, an output diode, a protection circuit and an output interface;

the timer 555 circuit is connected with the push-pull switch circuit;

the push-pull switch circuit is connected with the micro power inductor;

the 3.3V logic level conversion reference circuit is connected with the protection circuit;

the input voltage, the miniature power inductor, the output diode, the protection circuit and the output interface are sequentially connected.

2. The circuit of claim 1, wherein the timer 555 circuit is configured to generate adjustable pulses to control operation of the push-pull switching circuit.

3. The circuit of claim 1, wherein the push-pull switch circuit and the micro power inductor form a basic boost circuit for boosting an input voltage.

4. The circuit of claim 1, wherein the 3.3V logic level change reference circuit is configured to control the circuit to be off and on.

5. The circuit of claim 1, wherein the output diode is configured to ensure an output direction of the voltage.

6. The circuit of claim 1, wherein the protection circuit is configured to limit an input range of the input voltage for protection.

Technical Field

The invention belongs to the technical field of electronics, and particularly relates to a boost circuit.

Background

In recent years, with rapid development of power industries such as photovoltaic power generation, ultrahigh voltage transmission and the like, more and more power supplies in an ultra-wide input range are required, but the existing booster circuit generally has the defects of large volume, high cost, complex circuit, large interference, low reliability and the like.

Disclosure of Invention

The purpose of the invention is as follows:

the invention aims to provide a boost circuit which is used for driving a high-end MOS tube of a system.

The technical scheme is as follows:

a boost circuit comprises a timer 555 circuit, a push-pull switch circuit, a 3.3V logic level change reference circuit, a micro power inductor, an output diode, a protection circuit and an output interface;

the timer 555 circuit is connected with the push-pull switch circuit;

the push-pull switch circuit is connected with the micro power inductor;

the 3.3V logic level conversion reference circuit is connected with the protection circuit;

the input voltage, the miniature power inductor, the output diode, the protection circuit and the output interface are sequentially connected.

Based on the design of the timer 555, milliampere driving current uses small inductance, except the timer 555, the milliampere driving current is formed by small packaged discrete elements, the voltage is adjustable, the output of the booster circuit can be controlled by logic level, and the milliampere driving current can be conveniently used as a system high-end side MOS tube turn-off driving source.

Further, the timer 555 circuit is used for generating adjustable pulses to control the operation of the push-pull switch circuit.

Furthermore, the push-pull switch circuit and the miniature power inductor form a basic boost circuit for boosting the input voltage.

Further, the 3.3V logic level change reference circuit is used for controlling the off end and the conduction of the circuit.

Further, the output diode is used for ensuring the output direction of the voltage.

Furthermore, the protection circuit is used for limiting the input range of the input voltage and playing a protection role.

Has the advantages that:

the boost circuit is designed by adopting the timer 555, is realized on hardware, does not need software participation, and occupies less than 2cm of PCB area²The height is less than 2mm, the I0 port of the device such as the singlechip, the CPLD and the like controls the output interface module at the high-voltage side, the circuit is reliable, and the speed can reach the mu s level. When the peripheral load circuit has short circuit and overload, the output interface module can be disconnected to protect the boost circuit.

Drawings

FIG. 1 is a schematic block diagram of a boost circuit provided by the present invention;

FIG. 2 is a schematic diagram of a boost circuit according to the present invention;

FIG. 3, basic boost circuit;

FIG. 4 is an equivalent circuit of the boost circuit charging process;

fig. 5 shows an equivalent circuit of the discharge process of the boost circuit.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 3, which is the basic circuit of the boost circuit, assuming that Q1 has been off for a long time, all elements are in an ideal state, and the capacitor voltage is equal to the input voltage. When the charging process is started, Q1 is closed, and an equivalent circuit is shown in FIG. 4; when the discharging process is started, the Q1 is disconnected, the equivalent circuit is as shown in fig. 5, when the Q1 is disconnected, the current flowing through the inductor does not immediately become 0 due to the current holding characteristic of the inductor, but slowly changes from the value at the time of charging to 0, the original circuit Q1 is disconnected, and then the inductor can only discharge through the new circuit, namely, the inductor starts to discharge to the capacitor, the voltage at two ends of the capacitor rises, and at the moment, the voltage is higher than the input voltage, and the boosting is finished.