CN218733912U

CN218733912U - Novel bidirectional DC-DC converter circuit

Info

Publication number: CN218733912U
Application number: CN202222855593.2U
Authority: CN
Inventors: 曾忠; 徐邦浩
Original assignee: Nanjing Aoyunde Electronic Technology Co ltd
Current assignee: Nanjing Aoyunde Electronic Technology Co ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-03-24
Anticipated expiration: 2032-10-28

Abstract

The utility model discloses a novel two-way DC-DC converter circuit relates to converter technical field. The utility model discloses a main circuit, measurement and control circuit, discharge circuit and charging circuit, the main circuit is connected with measurement and control circuit, the equal electricity of discharge circuit and the step-down charging circuit that steps up, and shown main circuit includes first switch triode S1, second switch triode S2, electric capacity C1, electric capacity C2, inductance L, constant voltage power supply U1 and group battery U2, constant voltage power supply U1 'S positive pole, with inductance L, first switch triode S1' S projecting pole, first switch triode S1 'S collecting electrode, group battery U2' S positive pole, group battery U2 'S negative pole and constant voltage power supply U1' S negative pole formation series circuit, electric capacity C1 and the setting of establishing ties of constant voltage power supply U1. The utility model discloses a set up step-down charging circuit and boost discharge circuit, improve two-way main circuit structure, improve conversion efficiency to adopt feedback circuit and fortune to put the circuit and realize that voltage is adjustable and requirements such as constant current.

Description

Novel bidirectional DC-DC converter circuit

Technical Field

The utility model belongs to the technical field of the converter, especially, relate to a novel two-way DC-DC converter circuit.

Background

The bidirectional DC/DC converter is a direct current converter capable of operating in double boundaries and can realize bidirectional energy transmission. With the continuous development of the switching power supply technology, the bidirectional DC/DC converter has been widely applied to the fields of electric vehicles, solar cell arrays, uninterruptible power supplies, distributed power stations and the like, and as a new form of the DC/DC converter, the bidirectional DC/DC converter will inevitably occupy more and more important positions in the field of the switching power supply. The bidirectional DC/DC converter has a great market prospect because the volume, the weight and the cost of the system are greatly reduced when the bidirectional DC/DC converter is required to be used.

As shown in fig. 6, a main circuit structure of a conventional bidirectional DC/DC converter achieves the purpose of bidirectional DC voltage boosting and reducing by controlling switches T1 and T2. When the Boost is operated, the T2 acts, the T1 is cut off, and the converter works in a Boost state; when T1 acts and T2 is cut off, the converter works in a Buck state, and the voltage reduction function is realized.

When the existing bidirectional DC-DC converter circuit is applied to a rechargeable lithium battery, although the requirements of voltage reduction, voltage boosting, voltage adjustability, constant current and the like can be met, the charging and discharging conversion efficiency is reduced, and the application prospect of the bidirectional DC-DC converter circuit is limited.

Disclosure of Invention

An object of the utility model is to provide a novel two-way DC-DC converter circuit, through the Buck circuit, boost circuit improves circuit structure, improves conversion efficiency to realize with feedback circuit and operational amplifier circuit that voltage is adjustable with requirements such as constant current, with the problem of proposing in solving above-mentioned background art.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to a novel two-way DC-DC converter circuit, including main circuit, measurement and control circuit, discharge circuit and charging circuit, the main circuit is connected with measurement and control circuit, boost discharge circuit and step-down charging circuit electricity equally, shown main circuit includes first switch triode S1, second switch triode S2, electric capacity C1, electric capacity C2, inductance L, direct current constant voltage power supply U1 and group battery U2, direct current constant voltage power supply U1 'S positive pole, with inductance L, first switch triode S1' S projecting pole, first switch triode S1 'S collecting electrode, group battery U2' S positive pole, group battery U2 'S negative pole and direct current constant voltage power supply U1' S negative pole form series circuit, electric capacity C1 and direct current constant voltage power supply U1 establish ties and sets up, electric capacity C2 and group battery U2 connect in parallel and set up, second switch triode S2 'S collecting electrode and first switch triode S1' S projecting pole electricity are connected, second switch triode S2 'S projecting pole and direct current constant voltage power supply U1' S negative pole electricity are connected, first switch triode S2 'S collecting electrode and second switch triode S2' S constant voltage power supply have between the emitter to connect in parallel;

the input end of the buck charging circuit is electrically connected with the main circuit, the output end of the buck charging circuit is electrically connected with the battery pack U2, the output end of the boost discharging circuit is electrically connected with the main circuit, and the input end of the boost discharging circuit is electrically connected with the battery pack U2;

and the input end and the output end of the measurement and control circuit are electrically connected with the main circuit.

Preferably, the device further comprises an amplifier, wherein the amplifier adopts an amplifying circuit based on LM 358.

Preferably, the direct-current stabilized voltage power supply U1 adopts a direct-current stabilized voltage integrated circuit based on LM7805 and LM7815 to supply power to the main circuit.

Preferably, the measurement and control circuit adopts a parallel voltage-stabilizing integrated circuit based on the TL 431.

Preferably, the measurement and control circuit comprises negative feedback control and positive feedback + negative feedback control, the negative feedback control is used for the voltage boosting discharge circuit, and the positive feedback + negative feedback control is used for the voltage reduction charge circuit.

The utility model discloses following beneficial effect has:

the utility model discloses a through setting up step-down Buck circuit and Boost circuit, improve two-way DC-DC converter circuit structure, improve conversion efficiency to adopt feedback circuit and operational amplifier circuit to realize that voltage is adjustable and requirements such as constant current, do benefit to the use scene development of two-way DC/DC converter.

The utility model discloses a set up suitable switch triode and freewheeling diode and reduce input constant voltage power supply's electromagnetic interference and current pulsation, improve the stability of electric current in the circuit.

The utility model discloses the circuit is simple, and conversion efficiency is high, and the reliability is high, easy to maintain.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages simultaneously.

Drawings

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

Fig. 1 is a block diagram of a novel bidirectional DC-DC converter circuit according to the present invention;

fig. 2 is a schematic circuit diagram of the main circuit of the present invention;

fig. 3 is a schematic circuit diagram of the buck charging circuit of the present invention;

fig. 4 is a schematic circuit diagram of the boost discharge circuit of the present invention;

fig. 5 is a schematic circuit diagram of the measurement and control circuit of the present invention;

fig. 6 is a schematic circuit diagram of a conventional main circuit of a bidirectional DC/DC converter.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-5, the present invention relates to a novel bidirectional DC-DC converter circuit, which includes a main circuit, a measurement and control circuit, a discharge circuit and a charging circuit, wherein the main circuit is electrically connected to the measurement and control circuit, the boost discharge circuit and the buck charging circuit, the main circuit includes a first switching triode S1, a second switching triode S2, a capacitor C1, a capacitor C2, an inductor L, a DC regulated power supply U1 and a battery pack U2, the positive electrode of the DC regulated power supply U1, the inductor L, the emitter of the first switching triode S1, the collector of the first switching triode S1, the positive electrode of the battery pack U2, the cathode of the battery pack U2 and the cathode of the DC regulated power supply U1 form a series circuit, the capacitor C1 is connected in series with the DC regulated power supply U1, the capacitor C2 is connected in parallel with the battery pack U2, the collector of the second switching triode S2 is electrically connected to the emitter of the first switching triode S1, the cathode of the second switching triode S2 is electrically connected to the emitter of the DC regulated power supply U1, the third switching triode S2 is electrically connected in parallel with the emitter of the second switching triode S2;

The amplifier also comprises an amplifier, wherein the amplifier adopts an amplifying circuit based on LM 358.

The direct-current stabilized voltage power supply U1 adopts a direct-current stabilized voltage integrated circuit based on LM7805 and LM7815 to supply power to a main circuit.

The measurement and control circuit adopts a TL 431-based parallel voltage-stabilizing integrated circuit.

The measurement and control circuit comprises negative feedback control and positive feedback and negative feedback control, the negative feedback control is used for the voltage boosting discharge circuit, and the positive feedback and negative feedback control are used for the voltage reduction charge circuit.

And (3) constant current charging test:

basic data requirements: under the condition that U2=30V and the charging current is adjustable within the range of 1A to 2A, setting the initial value of Ii as step a, the step value being 0.1A, and the test data being as shown in table 1:

basic data requirements: under the condition that the charging circuit I1=2A, the output voltage of the dc regulated power supply was adjusted so that U2 was changed in the range of 24 to 36V, and the rate of change of I was calculated as shown in table 2:

calculated from table ii, the average rate of change =0.45%.

Basic data requirements: under the conditions that the charging current I1=2A and the output voltage of the direct current stabilized power supply U2=30V, the values of U1 and I2 are measured, and the efficiency of the converter is shown in Table 3:

it can be calculated that the conversion efficiency of the bidirectional DC-DC converter circuit described in the present embodiment is 89.5%.

In the description of the present specification, reference to the description of "one embodiment," "an example," "a specific example," etc., means 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments 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 invention and its practical applications, thereby enabling others skilled in the art to best understand the invention and its practical application. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A novel bidirectional DC-DC converter circuit is characterized in that: the direct current stabilized power supply comprises a main circuit, a measurement and control circuit, a discharge circuit and a charging circuit, wherein the main circuit is electrically connected with the measurement and control circuit, a boosting discharge circuit and a stepping-down charging circuit, the main circuit comprises a first switching triode S1, a second switching triode S2, a capacitor C1, a capacitor C2, an inductor L, a direct current stabilized power supply U1 and a battery pack U2, the positive electrode of the direct current stabilized power supply U1, the emitter of the inductor L, the emitter of the first switching triode S1, the collector of the first switching triode S1, the positive electrode of the battery pack U2, the negative electrode of the battery pack U2 and the negative electrode of the direct current stabilized power supply U1 form a series loop, the capacitor C1 is connected with the direct current stabilized power supply U1 in series, the capacitor C2 is connected with the battery pack U2 in parallel, the collector of the second switching triode S2 is electrically connected with the emitter of the first switching triode S1, the emitter of the second switching triode S2 is electrically connected with the emitter of the direct current stabilized power supply U1, and the collector of the first switching triode S1 and the second switching triode S2 are electrically connected in parallel;

2. The novel bidirectional DC-DC converter circuit according to claim 1, further comprising an amplifier, wherein the amplifier employs an LM 358-based amplification circuit.

3. The novel bidirectional DC-DC converter circuit as claimed in claim 1, wherein the DC stabilized power supply U1 employs a LM7805 and LM7815 based DC stabilized integrated circuit to supply power to the main circuit.

4. The novel bidirectional DC-DC converter circuit as claimed in claim 1, wherein the measurement and control circuit is a parallel voltage-stabilizing integrated circuit based on TL 431.

5. The novel bidirectional DC-DC converter circuit according to claim 1, wherein the measurement and control circuit comprises negative feedback control and positive feedback + negative feedback control, the negative feedback control is used for a boost discharge circuit, and the positive feedback + negative feedback control is used for a buck charging circuit.