CN219960401U

CN219960401U - Power control circuit and charger

Info

Publication number: CN219960401U
Application number: CN202320673605.1U
Authority: CN
Inventors: 肖秋林; 郑小雷; 游碧锋; 郭修根; 刘昊
Original assignee: Dongguan Aohai Technology Co ltd
Current assignee: Dongguan Aohai Technology Co ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-11-03
Anticipated expiration: 2033-03-30

Abstract

The utility model discloses a power supply power control circuit and a charger, wherein the power supply power control circuit comprises a rectifying circuit, a transformer, a rectifying and filtering circuit, a power output circuit, a voltage detection circuit and an optocoupler control circuit, which are arranged in series between a power supply input end and a power supply output end; one end of the voltage detection circuit is connected with a connecting node between the rectifying circuit and the transformer and is used for outputting a first voltage signal; one end of the optocoupler control circuit is connected with the voltage detection circuit, and the other end of the optocoupler control circuit is connected with the power output circuit and is used for outputting a second voltage signal to the power output circuit according to the first voltage signal; the power output circuit is used for adjusting output power according to the second voltage signal. By distinguishing between high and low voltages at the input and operating the circuit in a high power output state when the input voltage is high, the output power can be increased without increasing the size of the housing.

Description

Power control circuit and charger

Technical Field

The present utility model relates to the field of electronic technologies, and in particular, to a power control circuit and a charger.

Background

With the continuous leap development of the technology in the power industry, the output power of the domestic market consumer power supply is higher and the size requirement of the shell is not changed, and even is smaller.

Under the condition of full-voltage input (100-240V), under the condition of a certain output voltage, the capacity of the electrolytic capacitor is increased to upgrade the output power, but the increase of the capacity of the electrolytic capacitor can cause the increase of the capacity volume, which is contrary to the design requirement that the size of the charger shell is unchanged or even smaller. In addition, under the condition of the same output power in the capacity parameter selection of the electrolytic capacitor, the capacity requirement of the electrolytic capacitor is larger than the capacity requirement of the high-voltage input during the low-voltage input, and after the capacity of the electrolytic capacitor is selected by taking the low-voltage input as a reference, the capacity consumption is redundant during the high-voltage input, so that the utilization efficiency is not high.

Disclosure of Invention

The embodiment of the utility model provides a power supply power control circuit and a charger, which are used for solving the problems that the output power is difficult to upgrade under the condition that the size of a charger shell is certain, the consumption of an electrolytic capacitor is redundant during high-voltage input, and the utilization rate is low.

The utility model provides a power supply power control circuit which comprises a rectifying circuit, a transformer, a rectifying and filtering circuit, a power output circuit, a voltage detection circuit and an optocoupler control circuit, wherein the rectifying circuit, the transformer, the rectifying and filtering circuit and the power output circuit are arranged between a power supply input end and a power supply output end in series;

one end of the voltage detection circuit is connected with a connecting node between the rectifying circuit and the transformer, and the other end of the voltage detection circuit is grounded and used for carrying out voltage division on the mains voltage and outputting a first voltage signal;

one end of the optocoupler control circuit is connected with the voltage detection circuit, and the other end of the optocoupler control circuit is connected with the power output circuit and is used for outputting a second voltage signal to the power output circuit according to the first voltage signal;

the power output circuit is used for adjusting output power according to the second voltage signal.

Preferably, the voltage detection circuit includes a first resistor, a second resistor, a third resistor, and a fourth resistor;

the first resistor, the second resistor, the third resistor and the fourth resistor are arranged in series between the output end of the rectifying circuit and the ground;

and a connecting node between the third resistor and the fourth resistor is connected with the input end of the optocoupler control circuit.

Preferably, the optocoupler control circuit comprises an optocoupler control tube and an optocoupler;

the first end of the optocoupler control tube is connected with the voltage detection circuit, the second end of the optocoupler control tube is connected with the light-emitting side element of the photoelectric coupler, and the third end of the optocoupler control tube is grounded and used for controlling the on-off of the light-emitting side element of the photoelectric coupler according to a first voltage signal output by the voltage detection circuit;

the photoelectric coupler comprises a light-emitting side element and a light-receiving side element, wherein a first end of the light-emitting side element is connected with a first power supply end, a second end of the light-emitting side element is connected with the optical coupler control tube, a first end of the light-receiving side element is connected with a second power supply end, and a second end of the light-receiving side element is connected with the power output circuit and is used for outputting a second voltage signal to the power output circuit according to the on-off state of the light-emitting side element of the photoelectric coupler.

Preferably, the optocoupler control circuit further comprises a fifth resistor and a sixth resistor;

the first end of the light-emitting side element is connected with a first power supply end through a fifth resistor;

the first end of the light receiving side element is connected with the second power supply end through a sixth resistor.

Preferably, the optocoupler control circuit further comprises a first capacitor;

the first end of the first capacitor is connected with the first end of the optocoupler control tube, and the second end of the first capacitor is grounded.

Preferably, the power output circuit comprises a power control chip, a power output interface and a seventh resistor;

the first pin of the power control chip is connected with the optocoupler control circuit and is used for receiving a second voltage signal output by the optocoupler control circuit;

the second pin of the power control chip is connected with the first end of the seventh resistor, and the third pin of the power control chip is connected with the second end of the seventh resistor and is used for adjusting the voltage difference value between the two ends of the seventh resistor according to the second voltage signal so as to adjust the current input to the power output interface;

the first pin of the power output interface is connected with the first end of the seventh resistor, and the second end of the seventh resistor is grounded.

Preferably, a fourth pin of the power control chip is connected with the output end of the rectifying and filtering circuit;

and a second pin of the power output interface is connected with the output end of the rectifying and filtering circuit.

Preferably, the power supply power control circuit further comprises a first filter circuit;

one end of the first filter circuit is connected with the rectifying circuit, and the other end of the first filter circuit is connected with the transformer and the voltage detection circuit.

Preferably, the first filter circuit includes a filter capacitor;

one end of the filter capacitor is connected with a connecting node of the rectifying circuit, the transformer and the voltage detection circuit, and the other end of the filter capacitor is grounded.

The utility model also provides a charger, which comprises a shell and the power supply power control circuit.

According to the power supply power control circuit and the charger provided by the embodiment of the utility model, the voltage detection circuit is used for dividing the rectified direct-current mains voltage and outputting a first voltage signal to the optocoupler control circuit. When the direct-current mains voltage is high voltage, the first voltage signal can enable the optocoupler control circuit to be conducted, the conducted optocoupler control circuit outputs a second voltage signal to the power output circuit, the power output circuit outputs large current to an external terminal for charging, and the circuit works in a high-power charging state; when the direct-current mains voltage is low, the optocoupler control circuit is turned off, the charging current output to the external terminal by the power output circuit is unchanged, the charging current is maintained at a normal level, and the circuit maintains normal power output. By distinguishing the high voltage from the low voltage of the input end and outputting a large current when the input voltage is high voltage, the circuit works in a high-power output state, the capacity redundancy of the electrolytic capacitor during high-voltage input can be eliminated, the output power is increased under the condition that the size of the shell is not increased, and the output power of the circuit is maximized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some 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 illustrating signal transmission of a power control circuit according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a voltage detection circuit and an optocoupler control circuit according to an embodiment of the utility model;

FIG. 3 is a schematic diagram of a portion of a power output circuit according to an embodiment of the utility model;

fig. 4 is a schematic diagram of a portion of a rectifying circuit and a first filtering circuit according to an embodiment of the present utility model.

In the figure: 1. a rectifying circuit; 2. a transformer; 3. a rectifying and filtering circuit; 4. a power output circuit; 5. a voltage detection circuit; 6. an optocoupler control circuit; 7. a first filter circuit.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of 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. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.

It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.

Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

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 the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

An embodiment of the utility model provides a power control circuit of a power supply, which comprises a rectifying circuit 1, a transformer 2, a rectifying and filtering circuit 3, a power output circuit 4, a voltage detection circuit 5 and an optocoupler control circuit 6, wherein the rectifying circuit 1, the transformer 2, the rectifying and filtering circuit 3 and the power output circuit 4 are arranged in series between a power supply input end and a power supply output end; one end of the voltage detection circuit 5 is connected with a connecting node between the rectifying circuit 1 and the transformer 2, and the other end of the voltage detection circuit is grounded and used for carrying out voltage division on the mains voltage V and outputting a first voltage signal V1; one end of the optocoupler control circuit 6 is connected with the voltage detection circuit 5, and the other end of the optocoupler control circuit is connected with the power output circuit 4 and is used for outputting a second voltage signal V2 to the power output circuit 4 according to the first voltage signal V1; and the power output circuit 4 is used for adjusting the output power according to the second voltage signal V2.

The rectifier circuit 1 is a circuit for converting ac power into dc power, and the rectifier circuit 1 may be any of a half-wave rectifier circuit, a full-wave rectifier circuit, and a bridge rectifier circuit, and the bridge rectifier circuit is preferably used in this example.

The circuit is mainly applied to a charger, under the condition of full voltage input, the range of a mains voltage V input by the charger is generally between 100 and 240V, and a first voltage signal V1 is a voltage signal obtained by dividing a direct-current mains voltage VA output by a rectifying circuit 1 by a voltage detection circuit and is changed along with the change of the mains voltage V, and is used for controlling the on and off of an optocoupler control circuit 6 according to the height of the mains voltage V. When the mains voltage V is high voltage (182-240V), the optical coupler control circuit 6 is controlled to be turned on, and when the mains voltage V is low voltage (100-180V), the optical coupler control circuit 6 is controlled to be turned off.

The second voltage signal V2 is a voltage signal that is output to the power output circuit 4 when the optocoupler control circuit 6 is turned on, and can control the power output circuit 4 to output a large current, so that the output power is increased.

In this embodiment, during the operation of the power supply power control circuit, the rectifying circuit 1 converts the input mains voltage V into a dc mains voltage VA and outputs the dc mains voltage VA to the transformer 2 and the voltage detection circuit 5. The primary side of the transformer 2 receives the input direct-current commercial power voltage VA, the secondary side outputs the direct-current commercial power voltage subjected to the step-down treatment to the rectifying and filtering circuit 3, the rectifying and filtering circuit 3 carries out rectifying and filtering on the direct-current commercial power voltage subjected to the step-down treatment, and finally, the direct-current voltage Vo is output to a connected external terminal for charging. Meanwhile, the dc mains voltage VA input to the voltage detection circuit 5 is divided by the voltage detection circuit 5, and outputs a first voltage signal V1 to the optocoupler control circuit 6, where the first voltage signal V1 can control the on/off of the optocoupler control circuit 6 according to the voltage V of the mains voltage. When the direct-current commercial power voltage VA input to the voltage detection circuit 5 is high voltage, the optocoupler control circuit 6 is conducted, the optocoupler control circuit 6 outputs a second voltage signal V2 to the power output circuit 4, and the power output circuit 4 is controlled to output a large current to an external terminal, so that the circuit works in a high-power state; when the dc mains voltage VA input to the voltage detection circuit 5 is low, the optocoupler control circuit 6 is turned off, the charging current output from the power output circuit 4 to the external terminal is unchanged, the charging current is maintained at a normal level, and the circuit maintains normal power output. When the input voltage is high voltage, the circuit outputs a large current to work in a high power state, so that the capacity redundancy of the electrolytic capacitor during high voltage input can be eliminated, the output power is increased under the condition that the size of the shell is not increased, and the output power of the circuit is maximized.

In one embodiment, as shown in fig. 2, the voltage detection circuit 5 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4; the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are arranged in series between the output end of the rectifying circuit 1 and the ground; the connection node between the third resistor R3 and the fourth resistor R4 is connected to the input terminal of the optocoupler control circuit 6.

As an example, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are serially connected between the output terminal of the rectifying circuit 1 and the ground, and a connection node between the third resistor R3 and the fourth resistor R4 is connected to the input terminal of the optocoupler control circuit 6. The first resistor R1, the second resistor R2, and the third resistor R3 form a voltage division function on the input dc voltage VA, and the first voltage signal V1 output by the voltage detection circuit 5 is equal to the voltage across the fourth resistor R4. In the circuit operation process, the direct-current mains voltage VA output by the rectifying circuit 1 flows through the voltage detection circuit 5, is divided by the first resistor R1, the second resistor R2 and the third resistor R3, and outputs a first voltage signal V1 to the optocoupler control circuit 6, wherein the first voltage signal V1 changes along with the change of the direct-current mains voltage VA output by the end of the rectifying circuit 1.

In one embodiment, the optocoupler control circuit 6 includes an optocoupler control tube Q1 and an optocoupler; the first end of the optocoupler control tube Q1 is connected with the voltage detection circuit 5, the second end of the optocoupler control tube Q1 is connected with the luminous side element U1A of the optocoupler, and the third end of the optocoupler control tube Q1 is grounded and used for controlling the on-off of the luminous side element U1A of the optocoupler according to a first voltage signal V1 output by the voltage detection circuit 5; the photoelectric coupler comprises a light emitting side element U1A and a light receiving side element U1B, wherein a first end of the light emitting side element U1A is connected with a first power supply end VCC, a second end of the light emitting side element U1A is connected with an optical coupler control tube Q1, a first end of the light receiving side element U1B is connected with a second power supply end, and a second end of the light receiving side element U1B is connected with a power output circuit 6 and used for outputting a second voltage signal V2 to the power output circuit 4 according to the on-off state of the light emitting side element U1A of the photoelectric coupler.

The photoelectric coupler is an electric-optical-electric conversion device for transmitting electric signals by taking light as a medium, and consists of a light emitting source and a light receiver. The light source and the light receiver are usually assembled in the same airtight housing and are isolated from each other by a transparent insulator. The pins of the light-emitting source are input ends, the pins of the light receiver are output ends, the common light-emitting source is a light-emitting diode, and the light receiver is a photodiode, a phototriode and the like. In the present utility model, a light emitting diode is used as the light emitting side element U1A, and a phototransistor is used as the light receiving side element U1B.

The optocoupler control tube Q1 is preferably an N-channel enhanced MOS tube, the first end of the optocoupler control tube Q1 is a gate of the MOS tube, the second end is a drain of the MOS tube, and the third end is a source of the MOS tube. The first voltage signal V1 output from the voltage detection circuit 5 to the optocoupler control circuit 6 is the gate-source voltage Vgs of the optocoupler control tube Q1. When the mains voltage V is high, the first voltage signal V1, that is, vgs, is greater than the turn-on voltage of the MOS transistor, and the MOS transistor is turned on, so that the light-emitting element U1A connected between the drain of the MOS transistor and the first power supply terminal VCC is turned on to emit light.

The second voltage signal V2 is a voltage signal output when the light receiving side element U1B (i.e. the phototransistor) is turned on, that is, a voltage of the second power supply terminal of 3.3V, and provides a high level input for the power output circuit 4.

As an example, the optocoupler control tube Q1 receives the first voltage signal V1 from the voltage detection circuit 5, and the first voltage signal V1 changes with the change of the mains voltage V. When the mains voltage V is high voltage, the first voltage signal V1 input to the gate of the optocoupler control tube Q1, that is, vgs is greater than the turn-on voltage of the MOS tube, the MOS tube is turned on, the light-emitting side element U1A connected between the drain of the MOS tube and the first power supply terminal VCC is turned on to emit light, the light-receiving side element U1B receives the light signal and is turned on therewith, and the second voltage signal V2 (that is, high level) is output to the power output circuit 4 to control the power output circuit 4 to output a large current to an external terminal, so that the circuit works in a high-power state; when the mains voltage V is low, the first voltage signal V1 input to the gate of the optocoupler control tube Q1, that is, vgs is not greater than the turn-on voltage of the MOS tube, the MOS tube is turned off, the light-emitting side element U1A connected between the drain of the MOS tube and the first power supply terminal VCC cannot be turned on, the light-receiving side element U1B cannot receive the light signal and is also in the off state, the second voltage signal V2 cannot be output to the power output circuit 4, the power output circuit 4 is controlled to keep the charging current unchanged, and the circuit maintains normal power output.

In an embodiment, the optocoupler control circuit 6 further includes a fifth resistor R5 and a sixth resistor R6; the first end of the light-emitting side element U1A is connected with a first power supply end VCC through a fifth resistor R5; the first end of the light receiving side element U1B is connected to the second power supply end through a sixth resistor R6.

When the MOS transistor is turned on, the fifth resistor R5 and the sixth resistor R6 limit the current flowing through the light-emitting side element U1A and the light-receiving side element U1B within a certain range, so that the light-emitting side element U1A and the light-receiving side element U1B can work normally.

As an example, the first end of the light emitting side element U1A is connected to the first power supply end VCC through the fifth resistor R5, when the MOS transistor is turned on, the fifth resistor R5 plays a role in limiting current, so that the light emitting side element U1A can be normally turned on, and when the light emitting side element U1A is turned on to emit light, the light receiving side element U1B receives the light signal to be turned on. The sixth resistor R6 also serves to limit the current flowing through the light-receiving element U1B within the operating range of the light-receiving element U1B.

In an embodiment, the optocoupler control circuit 6 further includes a first capacitor C1; the first end of the first capacitor C1 is connected with the first end of the optocoupler control tube Q1, and the second end of the first capacitor C1 is grounded.

As an example, the first end of the first capacitor C1 is connected to the gate of the MOS transistor, and the second end is grounded, so as to perform energy storage and voltage stabilization, so that the first voltage signal V1 output from the voltage detection circuit 5 to the MOS transistor is more stable, and the MOS transistor is prevented from being turned on by mistake.

In one embodiment, the power output circuit 4 includes a power control chip U2, a power output interface, and a seventh resistor R7; the first pin P1 of the power control chip U2 is connected with the optocoupler control circuit 6 and is used for receiving a second voltage signal V2 output by the optocoupler control circuit 6; the second pin P2 of the power control chip U2 is connected with the first end of the seventh resistor R7, the third pin P3 of the power control chip U2 is connected with the second end of the seventh resistor R7, and the voltage difference between the two ends of the seventh resistor R7 is adjusted according to the second voltage signal V2, so that the current input to the power output interface is adjusted; the first pin A1 of the power output interface is connected with the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is grounded.

The power control chip U2 preferably uses an IP2723T protocol chip, and the power output interface can be a Type-C interface.

The power output interface is used for being connected with an external terminal through a data line, and each pin at the power output interface is used for being communicated with the external terminal or transmitting voltage information and current information. As shown in fig. 3, the first pin A1 of the power output interface and the third pin a12 of the power output interface are respectively the positive electrode and the negative electrode of the output interface, and are connected with an external terminal through a data line to form a complete charging loop.

As an example, the first pin P1 of the power control chip U2 is connected to the output end of the optocoupler control circuit 6, the seventh resistor R7 is connected between the first pin A1 of the power output interface and the ground, and two ends of the seventh resistor R7 are respectively connected to the second pin P2 and the third pin P3 of the power control chip U2. When the optocoupler control circuit 6 is turned on, the power control chip U2 receives the second voltage signal V2, that is, adjusts and increases the voltage difference between the second pin P2 and the third pin P3, so that the voltage value at both ends of the seventh resistor R3 is increased, and further the current value input to the first pin A1 of the power output interface is increased, the current value flowing into the charging circuit is increased, and the circuit works in a high-power state; when the optocoupler control circuit 6 is in the off state, the first pin P1 of the power control chip U2 cannot receive the second voltage signal V2, the voltage difference between the second pin P2 and the third pin P3 remains unchanged, the voltage value at two ends of the seventh resistor R7 remains unchanged, the current value input to the first pin A1 of the power output interface remains unchanged, the current value flowing into the charging circuit remains unchanged, and the circuit maintains normal power output.

In an embodiment, the fourth pin P4 of the power control chip U2 is connected to the output end of the rectifying and filtering circuit 3; the second pin A4 of the power output interface is connected with the output end of the rectifying and filtering circuit 3.

As an example, the fourth pin P4 of the power control chip U2 is connected to the output terminal of the rectifying and filtering circuit 3, for detecting whether the output voltage is within the normal range, and the second pin A4 and the fourth pin A9 of the power output interface are connected to the output terminal of the rectifying and filtering circuit 3, for outputting the voltage signal to the mobile terminal, so as to form a complete loop.

In an embodiment, the power supply power control circuit further comprises a first filter circuit 7; one end of the first filter circuit 7 is connected to the rectifier circuit 1, and the other end is connected to the transformer 2 and the voltage detection circuit 5.

As an example, the output end of the rectifying circuit 1 is connected to the input end of the first filter circuit 7, the output end of the first filter circuit 7 is connected to the transformer 2 and the voltage detection circuit 5, and the dc ripple voltage obtained by rectification can be more stable by accessing the first filter circuit 7, and the ac component is filtered.

In one embodiment, the first filter circuit 7 includes a filter capacitor EC1; one end of the filter capacitor EC1 is connected with a connecting node of the rectifying circuit 1, the transformer 2 and the voltage detection circuit 5, and the other end is grounded.

As an example, the first filter circuit 7 includes a filter capacitor EC1, where one end of the filter capacitor EC1 is connected to a connection node between the rectifier circuit 1 and the transformer 2 and between the filter capacitor EC1 and the voltage detection circuit 5, and the other end of the filter capacitor EC is grounded, so that an ac part in the dc ripple voltage can be effectively filtered, and the voltage is more stable. Only one filter capacitor is adopted, so that the occupied volume is smaller, the structure is simple, and the cost is low.

An embodiment of the present utility model further provides a charger, including a housing and the power control circuit of the above embodiment.

The shell is a charging head part shell in the charger, the switch power supply control circuit in the embodiment is arranged in the shell, and the power supply output end is connected with the mobile terminal through a charging wire for charging. In the charging process, the rectifying circuit 1 converts the input ac mains supply into dc mains supply, and the dc mains supply is output to the transformer 2 and the voltage detection circuit 5 after being filtered at the input end by the first filter circuit 7. The primary side of the transformer 2 receives the input direct-current commercial power voltage VA, the secondary side outputs the direct-current commercial power voltage subjected to voltage reduction to the rectification filter circuit 3, the rectification filter circuit 3 carries out output end rectification filter on the direct-current commercial power voltage subjected to voltage reduction, and finally, the direct-current voltage Vo is output to a connected external terminal for charging. At the same time, the dc mains voltage VA input to the voltage detection circuit 5 is divided by the voltage detection circuit 5, and the voltage detection circuit 5 outputs a first voltage signal V1 to the optocoupler control circuit 6, where the first voltage signal V1 varies according to the voltage V of the mains voltage. When the direct-current mains voltage VA input to the voltage detection circuit 5 is high voltage, the first voltage signal V1 can enable the optocoupler control circuit 6 to be turned on, the optocoupler control circuit 6 outputs the second voltage signal V2 to the power output circuit 4, and the power output circuit 4 is controlled to output a large current to an external terminal, so that the circuit works in a high-power state; when the dc mains voltage VA input to the voltage detection circuit 5 is low, the optocoupler control circuit 6 is turned off, the charging current output from the power output circuit 4 to the external terminal is unchanged, the charging current is maintained at a normal level, and the circuit maintains normal power output. When the input voltage is high voltage, the circuit outputs a large current to work in a high power state, so that the capacity redundancy of the electrolytic capacitor during high voltage input can be eliminated, the output power is increased under the condition that the size of the shell is not increased, and the output power of the circuit is maximized.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.

Claims

1. The power control circuit of the power supply comprises a rectifying circuit, a transformer, a rectifying and filtering circuit and a power output circuit which are arranged between a power input end and a power output end in series, and is characterized by further comprising a voltage detection circuit and an optocoupler control circuit;

2. The power supply power control circuit of claim 1, wherein the voltage detection circuit comprises a first resistor, a second resistor, a third resistor, and a fourth resistor;

3. The electrical power source power control circuit of claim 1, wherein the optocoupler control circuit comprises an optocoupler control tube and an optocoupler;

4. The electrical power control circuit of claim 3 wherein the optocoupler control circuit further comprises a fifth resistor and a sixth resistor;

5. The electrical power control circuit of claim 3 wherein the optocoupler control circuit further comprises a first capacitor;

6. The power supply power control circuit of claim 1, wherein the power output circuit comprises a power control chip, a power output interface, and a seventh resistor;

7. The power control circuit of claim 1, wherein a fourth pin of the power control chip is connected to an output of the rectifying and filtering circuit;

8. The power supply power control circuit of claim 7, wherein the power supply power control circuit further comprises a first filter circuit;

9. The power supply power control circuit of claim 8, wherein the first filter circuit comprises a filter capacitor;

10. A charger comprising a housing, wherein the charger further comprises the electrical power supply power control circuit of any one of claims 1-9.