CN219420287U

CN219420287U - Multi-output undervoltage protection control circuit

Info

Publication number: CN219420287U
Application number: CN202320095927.2U
Authority: CN
Inventors: 黄玲军; 胡宪权; 詹海峰; 谢峰; 万威; 黄浩
Original assignee: Hunan Giantsun Power Electronics Co Ltd
Current assignee: Hunan Giantsun Power Electronics Co Ltd
Priority date: 2023-02-01
Filing date: 2023-02-01
Publication date: 2023-07-25
Anticipated expiration: 2033-02-01

Abstract

The utility model provides a multi-output undervoltage protection control circuit which comprises a voltage transformation circuit, a multi-output circuit, an undervoltage detection circuit and a PWM control module, wherein the input end of the voltage transformation circuit is electrically connected with a PWM high-voltage switching power supply, and the output end of the voltage transformation circuit is electrically connected with the multi-output circuit. The multi-path output circuit is provided with a plurality of voltage output ends, the undervoltage detection circuit is connected to each voltage output end and is used for carrying out undervoltage detection on the output voltage of each voltage output end and outputting a feedback signal, and the PWM control module is connected to the feedback signal and inputs a PWM signal to the PWM high-voltage switching power supply to control the PWM high-voltage switching power supply to be turned on or turned off.

Description

Multi-output undervoltage protection control circuit

Technical Field

The utility model relates to the technical field of output protection, in particular to a multi-output undervoltage protection control circuit.

Background

Nowadays, the power supply is visible everywhere in daily life of people, so that the requirement on the reliability of the power supply is also higher and higher, and the power supply integrates various protection functions to ensure the reliability of the power supply. The existing power supply products in the market are lack of output under-voltage protection functions, and most of the under-voltage protection functions are protected through software. When no software program is used for controlling the circuit, the output undervoltage protection function is difficult to realize, and certain hidden danger is brought to consumers.

Disclosure of Invention

The utility model aims to provide a multi-output undervoltage protection control circuit so as to solve the problems in the background technology.

The utility model is realized by the following technical scheme: the utility model provides a multiplex output undervoltage protection control circuit, includes voltage transformation circuit, multiplex output circuit, undervoltage detection circuit and PWM control module, voltage transformation circuit's input links to each other with PWM high voltage switching power supply electricity, its output with multiplex output circuit electricity links to each other. The multi-path output circuit is provided with a plurality of voltage output ends, the undervoltage detection circuit is connected to each voltage output end and is used for carrying out undervoltage detection on the output voltage of each voltage output end and outputting a feedback signal, and the PWM control module is connected to the feedback signal and inputs a PWM signal to the PWM high-voltage switching power supply to control the PWM high-voltage switching power supply to be turned on or turned off.

Optionally, the voltage transformation circuit comprises a two-stage voltage reduction circuit.

Optionally, the input of each voltage output end is connected with a diode rectifying circuit, and the input end of the diode rectifying circuit is electrically connected with the output end of the voltage transformation circuit.

Optionally, the undervoltage detection circuit includes a master control IC, a triode Q5, diodes D7 and D8, a voltage protection pin of the master control IC is connected to a collector terminal of the triode Q5, an emitter terminal of the triode Q5 is further connected to another collector terminal through R17, an anode terminal of the diodes D7 and D8 is connected between the emitter terminal and another collector terminal of the triode Q5, and a cathode terminal is respectively connected to a plurality of voltage output terminals of the multiplexing circuit.

Optionally, at least one voltage output end of the multiplexing output circuit is connected with cathode ends of the diodes D7 and D8 through a voltage division sampling circuit.

Optionally, the PWM control module is a PWM controller.

Compared with the prior art, the utility model has the following beneficial effects:

according to the multi-output undervoltage protection control circuit provided by the utility model, the high voltage output by the PWM high-voltage switching power supply is reduced through the voltage transformation circuit, the stable output of multi-output voltage is realized through the multi-output circuit, the undervoltage detection is carried out on the multi-output voltage through the undervoltage detection circuit, when the undervoltage detection circuit detects that the multi-output voltage is lower than the set voltage, a feedback signal is output to the PWM control module, the PWM control module inputs the PWM signal to the PWM high-voltage switching power supply to control the PWM high-voltage switching power supply to be started or stopped, and the output of the multi-output voltage is stopped, so that the protection action of undervoltage output is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only preferred embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a control circuit for undervoltage protection with multiple outputs according to the present utility model;

FIG. 2 is a schematic diagram of a transformer circuit according to the present utility model;

FIG. 3 is a schematic diagram of a multi-output circuit according to the present utility model;

fig. 4 is a schematic circuit diagram of a master ICBD94121F chip provided by the present utility model;

FIG. 5 is a schematic diagram of an under-voltage detection circuit according to the present utility model.

In the figure, a 101PWM high-voltage switching power supply, a 102 transformer circuit, a 103 multiplexing output circuit, a 104 voltage output end, a 105 undervoltage detection circuit and a 106PWM control module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, exemplary embodiments according to the present utility model will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present utility model and not all embodiments of the present utility model, and it should be understood that the present utility model is not limited by the example embodiments described herein. Based on the embodiments of the utility model described in the present application, all other embodiments that a person skilled in the art would have without inventive effort shall fall within the scope of the utility model.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the utility model.

It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In order to provide a thorough understanding of the present utility model, detailed structures will be presented in the following description in order to illustrate the technical solutions presented by the present utility model. Alternative embodiments of the utility model are described in detail below, however, the utility model may have other implementations in addition to these detailed descriptions.

Referring to fig. 1, a control circuit for undervoltage protection with multiple outputs includes a transformer circuit 102, a multiple output circuit 103, an undervoltage detection circuit 105, and a PWM control module 106, where an input end of the transformer circuit 102 is electrically connected to the PWM high-voltage switching power supply 101, and an output end of the transformer circuit is electrically connected to the multiple output circuit 103. The multi-output circuit 103 has a plurality of voltage output terminals 104, the undervoltage detection circuit 105 is connected to each of the voltage output terminals 104, and is configured to detect an undervoltage of an output voltage of each of the voltage output terminals 104 and output a feedback signal, and the PWM control module 106 is connected to the feedback signal and inputs a PWM signal to the PWM high-voltage switching power supply 101 to control the PWM high-voltage switching power supply 101 to be turned on or off.

The utility model discloses a multi-output undervoltage protection control circuit, which is characterized in that a high-voltage output by a PWM high-voltage switching power supply 101 is reduced through a voltage transformation circuit 102, stable output of multi-output voltage is realized through a multi-output circuit 103, undervoltage detection is carried out on the multi-output voltage through an undervoltage detection circuit 105, when the multi-output voltage is detected to be lower than a set voltage by the undervoltage detection circuit 105, a feedback signal is output to a PWM control module 106, the PWM control module 106 inputs a PWM signal to the PWM high-voltage switching power supply 101 to control the PWM high-voltage switching power supply 101 to be turned on or off, and output of the multi-output voltage is stopped, so that protection action of undervoltage output is realized.

Referring to fig. 2, specifically, the voltage transformation circuit 102 includes a two-stage voltage step-down circuit for finally stepping down the 380V voltage output from the PWM high-voltage switching power supply 101 to 80V.

Referring to fig. 3, specifically, the input of each voltage output end 104 is connected to a diode rectifying circuit, the input end of the diode rectifying circuit is electrically connected to the output end of the transformer circuit 102, and rectifying and filtering are implemented on each voltage output end 104 by the diode rectifying circuit, so that each voltage output end 104 can stably output 80V voltage, and in this embodiment, two voltage output ends 104 are provided in total.

Referring to fig. 4 and fig. 5, specifically, the undervoltage detection circuit 105 includes a master control IC, a triode Q5, and diodes D7 and D8, the voltage protection pin of the master control IC is connected to the collector terminal C of the triode Q5 through R13, the emitter terminal e of the triode Q5 and the other collector terminal b are also connected to each other through R17, the stages Q5b and e are both 12V, the triode is in an off state, the C8 acts as a triode be stage filter, the anode terminals of the diodes D7 and D8 are connected between the emitter terminal e and the other collector terminal b of the triode Q5 through R15, the cathode terminals are respectively connected to the multiple voltage output terminals 104 of the multiple output circuit 103, and at least one voltage output terminal 104 of the multiple output circuit 103 is connected to the cathode terminals of the diodes D7 and D8 through a voltage division sampling circuit.

In this embodiment, the master control IC adopts a BD94121F chip, the 14 pin of the master control IC is connected to one collector terminal of the triode Q5, the voltage of the 14 pin is 4V when the voltage of the 14 pin is higher than 4V, the BD94121F performs a protection action and outputs a feedback signal, when the output voltage of each voltage output terminal 104 is higher than or equal to 80V, one voltage output terminal 104 realizes voltage division sampling through R7100K, R11100K, R636K, and the other voltage output terminal 104 realizes voltage division sampling through R9100K, R12100K, R1836K, so that the voltages of the negative terminals of D7 and D8 are higher than 12V, D7 and D8 are turned off and are not turned on, the collector terminal b and the collector terminal e of the triode Q5 have no voltage difference, and the triode Q5 is in a cut-off state.

When the output voltage of each voltage output end 104 is smaller than 80V, the voltages of the negative terminals of D7 and D8 are lower than 12V, D7 and D8 are conducted, the voltage difference between the collector terminal b and the collector terminal e of the triode Q5 is 0.7V, Q5 is in a conducting state, the 12V voltage is output to the 14 pin of the BD94121F chip through the triode Q5, the BD94121F chip performs protection action, and a feedback signal is output.

Furthermore, the utility model can accurately control the single-path undervoltage protection point in the multipath output by setting R7, R11, R6, R9, R12 and R18 with different resistance values, and has the characteristics of simple circuit structure, accurate undervoltage protection point and the like.

Specifically, the PWM control module 106 is a PWM controller, and the PWM controller can output a PWM wave signal according to the feedback signal, control the PWM high-voltage switching power supply 101 to turn on or off, and stop outputting multiple output voltages, thereby realizing protection action of output under-voltage.

It should be noted that, the circuits and electronic elements of the PWM high-voltage switching power supply 101, the PWM control module 106, the two-stage step-down circuit, the diode rectifying circuit and the like used in the present utility model are all products in the prior art, and those skilled in the art select, install and complete the debugging operation of the circuits according to the use requirement, so as to ensure that each electrical appliance can work normally, and the components are all universal standard components or components known to those skilled in the art, and the structures and principles of the components are all known to those skilled in the art through technical manuals or known through routine experimental methods, which applicant does not make specific restrictions herein.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.

Claims

1. The utility model provides a multiplex output undervoltage protection control circuit, its characterized in that includes voltage transformation circuit, multiplex output circuit, undervoltage detection circuit and PWM control module, voltage transformation circuit's input with PWM high voltage switching power supply electricity links to each other, its output with multiplex output circuit electricity links to each other, multiplex output circuit has a plurality of voltage output ends, undervoltage detection circuit inserts every voltage output end for carry out the undervoltage to the output voltage of every voltage output end and detect, and output feedback signal, PWM control module inserts feedback signal, and to PWM high voltage switching power supply input PWM signal control PWM high voltage switching power supply opens or closes.

2. The undervoltage protection control circuit of claim 1, wherein the voltage transformation circuit comprises a two-stage voltage step-down circuit.

3. The multi-output undervoltage protection control circuit of claim 1, wherein an input of each voltage output terminal is connected to a diode rectifier circuit, and an input of the diode rectifier circuit is electrically connected to an output of the transformer circuit.

4. The undervoltage protection control circuit according to claim 1, wherein the undervoltage detection circuit comprises a main control IC, a triode Q5, and diodes D7 and D8, wherein a voltage protection pin of the main control IC is connected to one collector terminal of the triode Q5, a transmitting terminal of the triode Q5 is further connected to the other collector terminal through R17, an anode terminal of the diodes D7 and D8 is connected between the transmitting terminal and the other collector terminal of the triode Q5, and cathode terminals are respectively connected to a plurality of voltage output terminals of the multiplexing circuit.

5. The undervoltage protection control circuit of claim 4, wherein at least one voltage output terminal of the undervoltage protection circuit is connected to cathode terminals of the diodes D7 and D8 through a voltage division sampling circuit.

6. The undervoltage protection control circuit of claim 1, wherein the PWM control module is a PWM controller.