CN210183241U - Multi-input integrated switching power supply circuit - Google Patents

Abstract

A multi-input integrated switch power supply circuit comprises a mains supply output control, a forward isolation converter and a BUCK circuit, wherein the BUCK circuit comprises a direct-current power supply input end, a switch tube, a freewheeling diode, an energy storage inductor, a filter capacitor and a load end; the input end of the commercial power output control is connected with the commercial power input end, the output end of the commercial power output control is connected with the primary end of the isolation converter, the commercial power is converted by the isolation converter and then outputs electric energy to the secondary end of the isolation converter, and the secondary end of the isolation converter outputs direct current through the rectifier diode and then transmits the electric energy to the load end through the energy storage inductor. Because the two groups of power supply circuits share the freewheeling diode, the energy storage inductor, the filter capacitor and the feedback circuit, and the two groups of power supply circuits are well integrated in one power supply circuit, the overall cost of the power supply circuit is reduced.

Description

Multi-input integrated switching power supply circuit

Technical Field

The application relates to the technical field of direct current load power supply, in particular to a multi-input integrated switching power supply circuit.

Background

The mains supply supplies power to the direct current load after being converted by the forward disconnecting switch power supply circuit, and can also be connected with photovoltaic energy or a battery to supply power to the direct current load through a non-disconnecting BUCK circuit. However, in the prior art, when the two power supply modes are adopted, a set of circuits is respectively constructed to supply power to the dc load, please refer to fig. 1 and fig. 2, and it is found by comparing fig. 1 and fig. 2 that the functions and connection relations of the multiple components of the two sets of power supply circuits are the same, so that resource waste is caused when the two sets of circuits are adopted to respectively supply power to the dc load, and the cost is increased.

Disclosure of Invention

The application provides a many input integrated switch power supply circuit, makes up commercial power supply circuit and DC power supply circuit, reduces the volume when reducing supply circuit's overall cost.

According to a first aspect, an embodiment provides a multiple-input integrated switching power supply circuit, which includes a mains output control, a forward isolation converter, and a BUCK circuit, where the BUCK circuit includes a dc power input terminal, a switching tube, a freewheeling diode, an energy storage inductor, a filter capacitor, and a load terminal; the input end of the commercial power output control is connected with the commercial power input end, the output end of the commercial power output control is connected with the primary end of the isolation converter, the commercial power is converted by the forward isolation converter and then outputs electric energy to the secondary end of the isolation converter, and the secondary end of the isolation converter outputs direct current through the rectifier diode and then transmits the electric energy to the load end through the energy storage inductor.

Preferably, the BUCK circuit further comprises a direct current output control, the direct current output control is connected with the switch tube, an optical coupler is arranged in the commercial power output control and the direct current output control, when the direct current output control detects that the direct current power input end has electric energy input, a power-off signal is sent to the commercial power output control through the optical coupler, and the commercial power output control disconnects the electric connection between the commercial power input end and the primary end of the isolation converter according to the power-off signal.

Preferably, the direct current output control comprises a forty-sixth diode, a photovoltaic control chip, a one hundred fifty-two resistance and a one hundred seventy-eight resistance, and the optical coupler comprises a first transmitting end and a first receiving end; and the forty-sixth diode, the one hundred fifty-two resistor, the one hundred seventy-eight resistor and the first emitting end are connected in series and then connected between the photovoltaic power input end and the photovoltaic control chip.

Preferably, the utility power output control includes a utility power control chip, a twenty-second triode, a first hundred-twelve capacitor, a hundred-sixty-three resistor and a hundred-sixty-nine resistor, the first hundred-sixty-three resistor, the first hundred-sixty-nine resistor and the first receiving terminal are connected in series between a power pin of the utility power control chip and the ground, the first hundred-twelve capacitor is connected in parallel with the first receiving terminal, a base of the twenty-second triode is connected to a node between the first hundred-sixty-three resistor and the first hundred-twelve capacitor, a collector of the twenty-second triode is grounded, and an emitter of the twenty-second triode is connected with a feedback pin of the utility power control chip.

Preferably, the load end is further connected with a feedback circuit, the feedback circuit is used for collecting the electrical parameters of the load end and feeding the electrical parameters back to the mains supply output control or the direct current output control, and the mains supply output control or the direct current output control adjusts the output power according to the fed electrical parameters.

Preferably, the mains output is controlled to be a forward isolated switching power supply.

According to the multi-input integrated switching power supply circuit of the embodiment, the two groups of power supply circuits share the freewheeling diode, the energy storage inductor, the filter capacitor and the feedback circuit in the process of supplying power to the load, and the two groups of power supply circuits are well integrated in one circuit, so that the effects of saving the cost and reducing the space volume are achieved.

Drawings

FIG. 1 is a schematic diagram of a non-isolated BUCK circuit;

FIG. 2 is a schematic diagram of a forward isolated switching power supply circuit;

FIG. 3 is a circuit diagram of the present application;

fig. 4 and 5 are partial enlarged views of fig. 3.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The structure and principle of the present application will be described below by taking two input power sources, namely, the commercial power source and the photovoltaic power source, as an example.

Referring to fig. 3-5, a multiple-input integrated switching power supply circuit includes a mains input terminal AC _ L/AC _ N, a forward isolation converter T1, a mains output controller 1, a photovoltaic power input terminal PV +/PV-, a dc output controller 2, a load terminal B +/SGND, an energy storage inductor L8, a freewheeling diode D47B, and a filter capacitor C122, wherein the mains input terminal AC _ L/AC _ N is electrically connected to a primary terminal of an isolation converter, the mains output controller 1 is connected between the mains input terminal and the isolation converter T1 for controlling power transmitted from the mains input terminal to the primary terminal of the isolation converter T1, a secondary terminal of the isolation converter T1 is connected to the load terminal B +/SGND through a diode D47A, an energy storage inductor L8, and a filter inductor L9, and the photovoltaic power input terminal is connected to the load terminal B +/SGND through a unidirectional diode D46, a switching tube Q29, a resistor R180, the energy storage inductor L8 and the filter inductor L9 are connected with a load end, and the direct current output control 2 is connected between the input end of the photovoltaic power supply and the energy storage inductor L8; the freewheeling diode D47B is connected between the high potential end of the energy storage inductor L8 and the ground, one end of the filter capacitor C122 is connected to a node between the energy storage inductor L8 and the filter inductor L9, and the other end of the filter capacitor C is grounded; be equipped with the opto-coupler in commercial power output control 1 and the direct current output control 2, direct current output control 2 detects that photovoltaic power input end has when electric energy input, sends the outage signal to commercial power output control 1 through the opto-coupler, and commercial power output control 1 breaks off the electric connection of commercial power input end AC _ L AC _ N and isolated converter T1 primary according to the outage signal. In this embodiment, the commercial power output control 1 is a forward isolated switching power supply.

Specifically, the direct current output control 2 comprises a forty-sixth diode D46, a photovoltaic control chip IC23, a one-hundred-fifty-two resistor R152 and a one-hundred-seventy-eight resistor R178, and the optical coupler comprises a first emitting terminal IC5A and a first receiving terminal IC 5B; and a forty-sixth diode D46, a one-hundred-fifty-two resistor R152, a one-hundred-seventy-eight resistor R178 and a first emitting end IC5A are connected in series and then connected between the positive terminal PV + of the photovoltaic power supply and the sixth pin of the photovoltaic control chip IC 23.

Specifically, the utility power output control 1 includes a utility power control chip IC22, a twenty-second triode Q22, a one-hundred-sixty-three capacitor C112, a one-hundred-sixty-three resistor R163, a one-hundred-sixty-nine resistor R169, and a first receiving terminal IC5B connected in series between a power supply pin of the utility power control chip IC22 and ground, the one-hundred-sixty-three capacitor C112 connected in parallel with the first receiving terminal IC5B, a base of a twenty-second triode Q22 connected to a node between the one-hundred-thirteen resistor R163 and the one-hundred-twelve capacitor C112, a collector of a twenty-second triode Q22 connected to ground, and an emitter of a twenty-second triode Q22 connected to a feedback pin of the utility power control.

Specifically, the load end B +/SGND is further connected with a feedback circuit 3, the feedback circuit 3 is used for collecting electrical parameters of the load end B +/SGND and feeding the electrical parameters back to the mains supply output control 1 or the direct current output control 2, and the mains supply output control 1 or the direct current output control 2 adjusts output power according to the fed-back electrical parameters.

The mains supply input end AC _ L/AC _ N transmits electric energy to a primary end of an isolation converter T1 through a mains supply output control 1, the isolation converter transmits the electric energy to a secondary end after voltage transformation, and the secondary end of the isolation converter T1 transmits the electric energy to a load end B +/SGND through a diode D47A, an energy storage inductor L8 and a filter inductor L9 to supply power to a load.

The photovoltaic power supply input end PV +/PV-transmits electric energy to the load end B +/SGND through the diode D46, the switching tube Q29, the resistor R180, the energy storage inductor L8 and the filter inductor L9 to supply power to the load, wherein the switching tube Q29 is controlled by the direct current output control 2, and the direct current output control 2 controls the electric power transmitted to the load end B +/SGND from the photovoltaic power supply input end PV +/PV-by controlling the duty ratio of the switching tube Q29.

Referring to fig. 5, when the photovoltaic power input terminal PV +/PV-has power input, the power is transmitted to the pin of the photovoltaic control chip IC23 through the diode D46, the one hundred seventy-eight resistor R178, the one hundred fifty-two resistor R152, and the first emitting terminal IC5A of the optical coupler, so that the first emitting terminal IC5A of the optical coupler emits light. Referring to fig. 4, after the optical coupler first receiving terminal IC5B receives the optical signal, the first receiving terminal IC5B is turned on, so that the base of the twenty-second triode Q22 becomes low level, the twenty-second triode Q22 is turned on, and the level of the feedback pin of the utility power control chip IC22 is pulled down, and the utility power control chip IC22 disconnects the electrical connection between the utility power input terminal AC _ L/AC _ N and the primary terminal of the isolation converter T1, so that the utility power input terminal AC _ L/AC _ N no longer supplies power to the load terminal B +/SGND, and the photovoltaic power input terminal PV +/PV-supplies power to the load terminal B +/SGND.

In order to normally supply power to the load terminal B +/SGND, sampling feedback needs to be performed on the battery of the load terminal B +/SGND, that is, power output adjustment is performed on the load terminal according to the voltage of the battery, so that power supply efficiency is maximized, and power supply to the load terminal is stopped after the battery is fully charged. Specifically, the voltage of a voltage division branch formed by voltage division resistors R183 and R103 is collected through a sampling chip IC24 to obtain the battery voltage, after the battery voltage is obtained, the luminous intensity of a second optical coupler transmitting end IC6A and a third optical coupler transmitting end IC7A is adjusted according to the fed-back voltage, after corresponding light intensity is received by a second optical coupler receiving end IC6B and a third optical coupler receiving end IC7B which are respectively connected to a mains supply output control 1 and a direct current output control 2, the optical coupler receiving ends IC6B and IC7B generate corresponding electrical parameters, and the mains supply output control 1 and the direct current output control 2 control the output power according to the corresponding electrical parameters.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (6)

1. A multi-input integrated switch power supply circuit is characterized by comprising a mains supply output control, a forward type isolation converter and a BUCK circuit, wherein the BUCK circuit comprises a direct-current power supply input end, a switch tube, a freewheeling diode, an energy storage inductor, a filter capacitor and a load end; the input end of the commercial power output control is connected with the commercial power input end, the output end of the commercial power output control is connected with the primary end of the isolation converter, the commercial power is converted by the isolation converter and then outputs electric energy to the secondary end of the isolation converter, and the secondary end of the isolation converter outputs direct current through the rectifier diode and then transmits the electric energy to the load end through the energy storage inductor.

2. The multiple-input integrated switching power supply circuit according to claim 1, wherein the BUCK circuit further comprises a dc output control, the dc output control is connected to the switching tube, an optical coupler is disposed in the utility power output control and the dc output control, when the dc output control detects that there is an electric energy input at the dc power input end, the optical coupler sends a power-off signal to the utility power output control, and the utility power output control disconnects the electric connection between the utility power input end and the primary end of the isolated converter according to the power-off signal.

3. The multi-input integrated switching power supply circuit according to claim 2, wherein the dc output control comprises a forty-sixth diode, a photovoltaic control chip, a one hundred fifty-second resistor, and a one hundred seventy-eight resistor, and the optocoupler comprises a first transmitting terminal and a first receiving terminal; and the forty-sixth diode, the one hundred fifty-two resistor, the one hundred seventy-eight resistor and the first emitting end are connected in series and then connected between the photovoltaic power input end and the photovoltaic control chip.

4. The multiple-input integrated switching power supply circuit according to claim 3, wherein the utility power output control comprises a utility power control chip, a twenty-second triode, a one hundred-twelve capacitor, a one hundred-sixty-three resistor, a one hundred-sixty-nine resistor, and a first receiving terminal connected in series between a power supply pin of the utility power control chip and the ground, the one hundred-twelve capacitor connected in parallel with the first receiving terminal, a base of the twenty-second triode connected to a node between the one hundred-sixty-three resistor and the one hundred-twelve capacitor, a collector of the twenty-second triode grounded, and an emitter of the twenty-second triode connected to a feedback pin of the utility power control chip.

5. A multiple-input integrated switching power supply circuit according to claim 2, wherein the load terminal is further connected to a feedback circuit, the feedback circuit is configured to collect an electrical parameter of the load terminal and feed the electrical parameter back to the commercial power output control or the dc output control, and the commercial power output control or the dc output control adjusts the output power according to the fed-back electrical parameter.

6. A multiple-input integrated switching power supply circuit as claimed in claim 2, wherein said mains output control is a forward isolated switching power supply.

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