CN213461543U

CN213461543U - High-voltage gain DC-DC converter

Info

Publication number: CN213461543U
Application number: CN202022471580.6U
Authority: CN
Inventors: 阎昌国; 陈廷儒; 李青; 安玉; 刘小雍; 张南庆; 张强
Original assignee: Zunyi Normal University
Current assignee: Zunyi Normal University
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-06-15
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a high-voltage gain DC-DC converter, which comprises a power input interface, a DC-DC converter, an input filter module, a voltage sensor, a current sensor, an over-voltage and under-voltage protection circuit, a PWM module, a CPU module and a power output interface; the power input interface is connected with the input filtering module; the input filtering module is respectively connected with the DC-DC converter and the PWM module; the power output interface is connected with a DC-DC converter; the voltage sensor and the current sensor are respectively connected with the power output interface; the two ends of the over-voltage and under-voltage protection circuit are respectively connected with the input filtering module and the CPU module; the CPU module is respectively connected with the PWM module, the voltage sensor and the current sensor. The utility model discloses possess overheated, excessive pressure, overcurrent protection function, can in time receive the feedback, voltage control time is shorter, but real-time supervision.

Description

High-voltage gain DC-DC converter

Technical Field

The utility model relates to a DC-DC converter technical field, more specifically relates to a high voltage gain DC-DC converter.

Background

With the development of energy technology, the application of new energy such as photovoltaic and the like is greatly popularized and applied as a hot point in the current electric power industry, but the requirements of new energy systems on the power electronic technology are higher and higher. The small-capacity power supply represented by photovoltaic has the characteristics of low voltage and large quantity, and in practical application, a photovoltaic system with a lower voltage level can be incorporated into a power grid or directly provide electric energy for a user after the voltage of the photovoltaic system is raised through a high-gain DC-DC converter. With the development of distributed power supplies, DC-DC converters are required to have high-quality, high-efficiency, and high-stability power supply capability.

The high-voltage gain DC-DC converter adopted in the prior art does not have the functions of overheat, overvoltage and overcurrent protection, can not receive feedback in time, has long voltage regulation time, can not be monitored in real time and has larger limitation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a possess overheated, excessive pressure, overcurrent protection function, can in time receive the feedback, voltage control time is shorter, but real-time supervision's high voltage gain DC-DC converter.

In order to solve the above problems, a high voltage gain DC-DC converter is provided, which comprises a power input interface, a DC-DC converter, an input filter module, a voltage sensor, a current sensor, an over-voltage and under-voltage protection circuit, a PWM module, a CPU module and a power output interface; the power input interface is connected with the input filtering module; the input filtering module is respectively connected with the DC-DC converter and the PWM module; the power output interface is connected with a DC-DC converter; the voltage sensor and the current sensor are respectively connected with the power output interface; the two ends of the over-voltage and under-voltage protection circuit are respectively connected with the input filtering module and the CPU module; the CPU module is respectively connected with the PWM module, the voltage sensor and the current sensor;

the DC-DC converter comprises an input capacitor CL, an output capacitor C3, an inductor L1, an inductor L2, an inductor L3, a switch component S1, a switch component S2, a switch component S3, a diode D1, a diode D2, a diode D3, an energy storage capacitor C1 and an energy storage capacitor C2; the input capacitor CL is connected with the input filtering module; one end of the inductor L1 is connected with the input filtering module, and the other end of the inductor L1 is respectively connected with the switch component S1 and the anode of the diode D1; one end of the inductor L2 is connected with the input filtering module, the other end of the inductor L2 is respectively connected with one end of the switch component S2 and one end of the energy storage capacitor C1, and the other end of the energy storage capacitor C1 is respectively connected with the cathode of the diode D1 and the anode of the diode D2; one end of the inductor L3 is connected with the input filtering module, the other end of the inductor L3 is respectively connected with one end of the switch component S2 and one end of the energy storage capacitor C2, and the other end of the energy storage capacitor C2 is respectively connected with the cathode of the diode D2 and the anode of the diode D3; and the cathode of the diode D3 and the output capacitor C3 are respectively connected with a power output interface.

In particular, the inductance values of the inductor L1, the inductor L2, and the inductor L3 are all equal.

In particular, the capacitance values of the energy storage capacitor C1 and the energy storage capacitor C2 are all equal.

Particularly, the switch assembly S1, the switch assembly S2 and the switch assembly S3 are all composed of diodes and field effect transistors; the anode of the diode is connected with the source electrode of the field effect transistor, and the cathode of the diode is connected with the drain electrode of the field effect transistor.

Particularly, the CPU module selects a chip with PWM output, and the chip with PWM output is a PIC, ARM or STC single chip microcomputer.

Particularly, the UCC2803 control chip is selected as the PWM module.

The utility model has the advantages that:

the utility model has simple structure, the DC-DC converter adopts a plurality of parallel switch capacitors, can realize wide voltage input range and high voltage gain, has small output power, does not consider the heat dissipation problem, and the device can meet the heat dissipation requirement; the over-voltage and under-voltage protection circuit has the functions of over-voltage and over-current protection, the voltage sensor, the current sensor, the PWM module and the CPU module can timely receive feedback, the voltage regulation time is short, and real-time monitoring can be carried out.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a circuit according to an embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.

As shown in fig. 1, the high-voltage gain DC-DC converter of this embodiment includes a power input interface, a DC-DC converter, an input filter module, a voltage sensor, a current sensor, an over-voltage and under-voltage protection circuit, a PWM module, a CPU module, and a power output interface. The power input interface is connected with the input filtering module. The input filtering module is respectively connected with the DC-DC converter and the PWM module. The power output interface is connected with the DC-DC converter. The voltage sensor and the current sensor are respectively connected with the power output interface. And two ends of the over-voltage and under-voltage protection circuit are respectively connected with the input filtering module and the CPU module. The CPU module is respectively connected with the PWM module, the voltage sensor and the current sensor. The CPU module selects a chip with PWM output, and the chip with PWM output is a PIC, ARM or STC singlechip. The CPU module can obtain output voltage data of the voltage sensor and output current data of the current sensor and control the PWM module to regulate input current and input power. The PWM module selects a UCC2803 control chip. The PWM module adopts a UCC2803 chip, the UCC2803 has a simple structure, and is a relatively wide integrated current drive control circuit, and the current control pulse width modulator overcomes the defects of slow frequency response, low voltage regulation rate and low load regulation rate of a voltage control switching power supply.

The DC-DC converter comprises an input capacitor CL, an output capacitor C3, an inductor L1, an inductor L2, an inductor L3, a switching element S1, a switching element S2, a switching element S3, a diode D1, a diode D2, a diode D3, an energy storage capacitor C1 and an energy storage capacitor C2. The input capacitor CL is connected with the input filtering module. One end of the inductor L1 is connected to the input filter module, and the other end is connected to the switch module S1 and the anode of the diode D1. One end of the inductor L2 is connected to the input filter module, the other end is connected to one end of the switch module S2 and one end of the energy storage capacitor C1, and the other end of the energy storage capacitor C1 is connected to the cathode of the diode D1 and the anode of the diode D2. One end of the inductor L3 is connected to the input filter module, the other end is connected to one end of the switch module S2 and one end of the energy storage capacitor C2, and the other end of the energy storage capacitor C2 is connected to the cathode of the diode D2 and the anode of the diode D3. The cathode of the diode D3 and the output capacitor C3 are connected to the power output interface, respectively, and set at C3=470 uH. Inductance L1, inductance L2, inductance L3's inductance value equals, the embodiment of the utility model provides an establish L1= L2= L3=125 uH. The capacitance values of the energy storage capacitor C1 and the energy storage capacitor C2 are equal, and C1= C2=10uF is set. The switch module S1, the switch module S2 and the switch module S3 are all composed of diodes and field effect transistors. The anode of the diode is connected with the source electrode of the field effect transistor, and the cathode of the diode is connected with the drain electrode of the field effect transistor. When input power UL =10V, adopt the switch tube drive phase place to differ 120 degrees in proper order, the duty cycle is 0.7, and output voltage =100V, explains the utility model discloses can obtain higher voltage gain.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes and modifications can be made by the owner within the scope of the appended claims, and the protection scope of the present invention should not be exceeded by the claims.

Claims

1. A high voltage gain DC-DC converter, characterized by: the power supply control circuit comprises a power supply input interface, a DC-DC converter, an input filtering module, a voltage sensor, a current sensor, an over-voltage and under-voltage protection circuit, a PWM module, a CPU module and a power supply output interface; the power input interface is connected with the input filtering module; the input filtering module is respectively connected with the DC-DC converter and the PWM module; the power output interface is connected with a DC-DC converter; the voltage sensor and the current sensor are respectively connected with the power output interface; the two ends of the over-voltage and under-voltage protection circuit are respectively connected with the input filtering module and the CPU module; the CPU module is respectively connected with the PWM module, the voltage sensor and the current sensor;

2. A high voltage gain DC-DC converter as claimed in claim 1, wherein: the inductance values of the inductor L1, the inductor L2 and the inductor L3 are all equal.

3. A high voltage gain DC-DC converter as claimed in claim 1, wherein: the capacitance values of the energy storage capacitor C1 and the energy storage capacitor C2 are equal.

4. A high voltage gain DC-DC converter as claimed in claim 1, wherein: the switch component S1, the switch component S2 and the switch component S3 are all composed of diodes and field effect transistors; the anode of the diode is connected with the source electrode of the field effect transistor, and the cathode of the diode is connected with the drain electrode of the field effect transistor.

5. A high voltage gain DC-DC converter as claimed in claim 1, wherein: the CPU module selects a chip with PWM output, and the chip with PWM output is a PIC, ARM or STC single chip microcomputer.

6. A high voltage gain DC-DC converter as claimed in claim 1, wherein: the PWM module selects a UCC2803 control chip.