CN211296566U

CN211296566U - Boost DC-DC converter

Info

Publication number: CN211296566U
Application number: CN201821852167.0U
Authority: CN
Inventors: 陈怡�
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2020-08-18
Anticipated expiration: 2028-11-12

Abstract

A boost DC-DC converter comprises an inductor L1, a diode D1, a capacitor C1, an inductor L2, a capacitor Co and 1 electronic switch, wherein the electronic switch is provided with a port a and a port b, one end of the inductor L1 is connected with the positive end of a direct-current power supply Vi, the other end of the inductor L1 is connected with the anode of a diode D1 and the port a of the electronic switch at the same time, the cathode of the diode D1 is connected with one end of the capacitor C1, one end of the capacitor Co and one end of a load Z at the same time, the port b of the electronic switch is connected with the other end of the capacitor C1 and one end of the inductor L2 at the same time, and the other end of the load Z is connected with the other end of the capacitor Co, the other end of the inductor L2. The utility model discloses has following operating characteristic: the input current and the output current are continuous, and the output voltage is greater than or equal to the direct-current power supply voltage and has the same polarity.

Description

Boost DC-DC converter

Technical Field

The utility model relates to a direct current-direct current (DC-DC) converter, especially a type of stepping up DC-DC converter that input and output current are all continuous and input and output voltage homopolarity can construct the direct current electrical power generating system of many inputs and many outputs as basic unit, if: the system comprises a direct current power supply module parallel system, an LED array driving system, a distributed photovoltaic power generation system and the like.

Background

The existing basic DC-DC converter with the Boost function includes a Boost converter, a Buck-Boost converter, a Cuk converter, a Sepic converter and a Zeta converter. As listed in table 1, none of the 5 basic DC-DC converters with a boost function described above satisfies the requirement of "input and output currents are continuous and input and output voltages are of the same polarity" without considering the output capacitance.

Table 1.

Disclosure of Invention

In order to overcome the current basic DC-DC converter that has the function of stepping up and not to satisfy "input and output current all continuous and input and output voltage homopolarity" the requirement not enough, the utility model provides a type of stepping up DC-DC converter can realize that input and output current all continuous and input and output voltage homopolarity expand the kind of DC-DC converter.

The utility model provides a technical scheme that its technical problem adopted is:

a boost DC-DC converter comprises an inductor L1, a diode D1, a capacitor C1, an inductor L2, a capacitor Co and 1 electronic switch, wherein the electronic switch is provided with a port a and a port b, one end of the inductor L1 is connected with the positive end of a direct-current power supply Vi, the other end of the inductor L1 is connected with the anode of a diode D1 and the port a of the electronic switch at the same time, the cathode of the diode D1 is connected with one end of the capacitor C1, one end of the capacitor Co and one end of a load Z at the same time, the port b of the electronic switch is connected with the other end of the capacitor C1 and one end of the inductor L2 at the same time, and the other end of the load Z is connected with the other end of the capacitor Co, the other end of the inductor L2.

The utility model discloses in, when electronic switch when ending, diode D1 switches on, and DC power supply Vi, inductance L1, diode D1, electric capacity C1 and inductance L2 constitute a return circuit, and DC power supply Vi, inductance L1, diode D1, electric capacity Co and load Z constitute another return circuit.

When the electronic switch is turned on, the diode D1 is turned off, the dc power source Vi, the inductor L1, the electronic switch and the inductor L2 form a loop, and the dc power source Vi, the inductor L1, the electronic switch, the capacitor C1, the capacitor Co and the load Z form another loop.

Further, the electronic switch adopts a unidirectional conductive electronic switch, that is, when the electronic switch is conductive, the current flows in from the port a and flows out from the port b. This preference is to prevent current backflow.

Still further, the electronic switch includes diode D2, N-type MOS transistor M1 and 1 controller, the controller has port vg, the anode of diode D2 is connected to port a of the electronic switch, the cathode of diode D2 is connected to the drain of N-type MOS transistor M1, the source of N-type MOS transistor M1 is connected to port b of the electronic switch, and the gate of N-type MOS transistor M1 is connected to port vg of the controller.

The controller determines the working state of the N-type MOS tube M1, and the controller adopts a power supply control chip.

The technical conception of the utility model is as follows: the diode D1 and the electronic switch are reasonably configured, so that the capacitor C1, the inductor L1 and the inductor L2 cooperatively store and release energy in one working period, high-efficiency boosting conversion is realized, and input current continuity, output current continuity and output voltage polarity invariance are realized.

The beneficial effects of the utility model are that: the boost DC-DC converter has simple circuit structure and has the working characteristics of high efficiency, continuous input and output current, consistent output and input voltage polarity and output voltage Vo larger than or equal to the DC power supply voltage Vi.

Drawings

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

Fig. 2 is a waveform diagram of the simulation operation according to the embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 and 2, a boost DC-DC converter includes an inductor L1, a diode D1, a capacitor C1, an inductor L2, a capacitor Co, and 1 electronic switch, where the electronic switch has a port a and a port b, one end of the inductor L1 is connected to a positive terminal of a DC power source Vi, the other end of the inductor L1 is connected to an anode of a diode D1 and the port a of the electronic switch, a cathode of the diode D1 is connected to one end of the capacitor C1, one end of the capacitor Co, and one end of a load Z, the port b of the electronic switch is connected to the other end of the capacitor C1 and one end of the inductor L2, and the other end of the load Z is connected to the other end of the capacitor Co, the other end of the inductor L2, and a negative terminal of the DC power source Vi.

Further, in order to prevent the reverse current, the electronic switch adopts a unidirectional conductive electronic switch, that is, the electronic switch flows in from the port a and flows out from the port b when conducting.

The controller determines the working state of the N-type MOS transistor M1, and the controller adopts a conventional power control chip, such as: UC3842 and the like.

When the embodiment is in Continuous Conduction Mode (CCM), L2 can be approximated as a constant current source, and the whole steady state operation process includes the following 2 stages.

Stage 1: the N-type MOS transistor M1 is turned off, the diode D1 is turned on, the direct-current power supply Vi, the inductor L1, the diode D1, the capacitor C1 and the inductor L2 form a loop, and the direct-current power supply Vi, the inductor L1, the diode D1, the capacitor Co and the load Z form another loop. At this time, C1 was charged and L1 was discharged. The input current ii and the output current io (which means the current flowing through the capacitor Co and the load Z) both decrease linearly.

And (2) stage: the N-type MOS transistor M1 is turned on, the diode D1 is turned off, the diode D2 is turned on, the direct-current power supply Vi, the inductor L1, the diode D2, the N-type MOS transistor M1 and the inductor L2 form a loop, and the direct-current power supply Vi, the inductor L1, the diode D2, the N-type MOS transistor M1, the capacitor C1, the capacitor Co and the load Z form another loop. At this time, C1 was discharged and L1 was magnetized. Both the input current ii and the output current io rise linearly.

FIG. 2 is a waveform diagram of a simulation operation of an embodiment. As can be seen from fig. 2, the input current ii is continuous, the output current io is continuous, the ripple of the inductor current iL2 is small, and the output voltage Vo is greater than the dc power voltage Vi, and the output voltages Vo and Vi have the same polarity.

The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather by the claims and their equivalents.

Claims

1. A step-up DC-DC converter, characterized in that: the boost DC-DC converter comprises an inductor L1, a diode D1, a capacitor C1, an inductor L2, a capacitor Co and 1 electronic switch, wherein the electronic switch is provided with a port a and a port b, one end of the inductor L1 is connected with the positive end of a DC power supply Vi, the other end of the inductor L1 is connected with the anode of a diode D1 and the port a of the electronic switch at the same time, the cathode of the diode D1 is connected with one end of the capacitor C1, one end of the capacitor Co and one end of a load Z at the same time, the port b of the electronic switch is connected with the other end of the capacitor C1 and one end of the inductor L2 at the same time, and the other end of the load Z is connected with the other end of the capacitor Co, the other end of the inductor L2.

2. A step-up DC-DC converter as claimed in claim 1, wherein: the electronic switch adopts a unidirectional conductive electronic switch, namely, when the electronic switch is conductive, the current flows in from the port a and flows out from the port b.

3. A step-up DC-DC converter as claimed in claim 2, wherein: the electronic switch comprises a diode D2, an N-type MOS tube M1 and 1 controller, wherein the controller is provided with a port vg, the anode of the diode D2 is connected with the port a of the electronic switch, the cathode of the diode D2 is connected with the drain of the N-type MOS tube M1, the source of the N-type MOS tube M1 is connected with the port b of the electronic switch, and the gate of the N-type MOS tube M1 is connected with the port vg of the controller.

4. A step-up DC-DC converter as claimed in claim 3, wherein: the controller adopts a power supply control chip.