Charging circuit for charging wire and charging wire

Abstract

The utility model provides a charging circuit used for a charging line and the charging line, the charging circuit comprises a power supply input end and a power supply output end, the charging circuit also comprises a voltage dividing unit, the input end of the voltage dividing unit is electrically connected with the power supply input end; the first connecting end of the switch unit is electrically connected with the output end of the voltage dividing unit, and the second connecting end of the switch unit is electrically connected with the power supply output end; the first detection end of the detection unit is electrically connected with the input end of the voltage dividing unit, and the second detection end of the detection unit is electrically connected with the output end of the voltage dividing unit; the signal receiving end of the control unit is electrically connected with the signal output end of the detection unit, and the first control end of the control unit is electrically connected with the controlled end of the switch unit. Therefore, the charging circuit can be disconnected under the conditions that the battery connected with the equipment is fully charged and the charging current is too large.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic technical field, specifically, relate to a charging circuit and charging wire for charging wire. BACKGROUND

[0002] The charging wire is the cable that is used to charge the equipment specially. It usually only has two lines, is used to connect the charging port of equipment to power or charger, thereby realizes the charging function. But when the battery of connecting equipment has full power or appears the overlarge charging current, the charging wire still charges the connecting equipment, influences the equipment life.

[0003] Therefore, how can disconnect the charging circuit of charging wire under the condition that the battery of connecting equipment has full power and appears the overlarge charging current becomes the technical problem that is urgent to solve. CONTENT

[0004] In order to solve the above problem, the utility model provides a charging circuit and charging wire for charging wire.

[0005] First, the utility model provides a kind of charging circuit for charging wire, including power input terminal and power output terminal, the charging circuit further includes:

[0006] Voltage dividing unit, the input end of the voltage dividing unit is electrically connected with the power input terminal;

[0007] Switch unit, the first connecting end of the switch unit is electrically connected with the output end of the voltage dividing unit, and the second connecting end of the switch unit is electrically connected with the power output terminal;

[0008] Detection unit, the first detection end of the detection unit is electrically connected with the input end of the voltage dividing unit, and the second detection end of the detection unit is electrically connected with the output end of the voltage dividing unit;

[0009] Control unit, the signal receiving end of the control unit is electrically connected with the signal output end of the detection unit, and the first control end of the control unit is electrically connected with the controlled end of the switch unit.

[0010] Beneficial effects:

[0011] The utility model discloses a hardware architecture for disconnecting the charging circuit of the charging line when the battery of the connected device is full and the charging current is too large.

[0012] Further, the switch unit includes a first triode Q1 and a second field effect tube Q2, the base of the first triode Q1 is electrically connected with the first control end, the emitter of the first triode Q1 is grounded, the collector of the first triode Q1 is electrically connected with the gate of the second field effect tube Q2, the source of the second field effect tube Q2 is electrically connected with the output end of the voltage division unit, and the drain of the second field effect tube Q2 is electrically connected with the power output end.

[0013] Further, the switch unit further includes a fourth resistance R4 and a first one hundred and ninety-two resistance R192, the first end of the fourth resistance R4 is electrically connected with the base of the first triode Q1, the second end of the fourth resistance R4 is electrically connected with the emitter of the first triode Q1, the first end of the first one hundred and ninety-two resistance R192 is electrically connected with the first control end, and the second end of the first one hundred and ninety-two resistance R192 is electrically connected with the base of the first triode Q1.

[0014] Further, the voltage division unit includes a first resistance R1, the first end of the first resistance R1 is electrically connected with the power input end, and the second end of the first resistance R1 is electrically connected with the first connection end.

[0015] Further, the detection unit includes a detection chip U3 and a pull-up resistance, the signal output end of the detection chip U3 is electrically connected with the signal receiving end of the control unit, the first end of the pull-up resistance is electrically connected with the signal output end of the detection chip U3, and the second end of the pull-up resistance is electrically connected with the power input end.

[0016] Further, the charging circuit further comprises a voltage conversion unit, a voltage input end of the voltage conversion unit is electrically connected with the power input end, and voltage output ends of the voltage conversion unit are electrically connected with the first voltage input end of the detection unit and the second voltage input end of the control unit.

[0017] Further, the voltage conversion unit comprises a voltage reduction chip U1, a first capacitor C1 and a second capacitor C2, an input end of the voltage reduction chip U1 is electrically connected with the power input end, output ends of the voltage reduction chip U1 are electrically connected with the first voltage input end of the detection unit and the second voltage input end of the control unit, a grounding end of the voltage reduction chip U1 is grounded, a first end of the first capacitor C1 is electrically connected with the input end of the voltage reduction chip U1, a second end of the first capacitor C1 is grounded, a first end of the second capacitor C2 is electrically connected with the output end of the voltage reduction chip U1, and a second end of the second capacitor C2 is grounded.

[0018] Further, the charging circuit further comprises a display unit, a first end of the display unit is electrically connected with the voltage output end, and a second end of the display unit is electrically connected with the second control end of the control unit.

[0019] Further, the display unit comprises a fifth resistor R5 and a first light emitting diode D1, a first end of the fifth resistor R5 is electrically connected with the voltage output end, a second end of the fifth resistor R5 is electrically connected with a positive electrode of the first light emitting diode D1, and a negative electrode of the first light emitting diode D1 is electrically connected with the second control end of the control unit.

[0020] In a second aspect, the present application provides a charging line comprising an energy storage battery and a charging circuit for the charging line according to any one of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0022] Figure 1 A circuit schematic diagram of the charging circuit for the charging line according to the present application is provided.

[0023] Figure 2 A circuit schematic diagram of the charging circuit for the charging line according to another embodiment of the present application is provided.

[0024] Figure 3 A circuit diagram of the charging circuit for the charging line according to another embodiment of the present application is provided.

[0025] In the figure: 1, power input terminal; 2, voltage dividing unit; 3, switch unit; 31, first connection end; 32, second connection end; 33, controlled end; 4, power output terminal; 5, detection unit; 51, first detection end; 52, second detection end; 53, signal output end; 54, first voltage input end; 6, control unit; 61, signal receiving end; 62, first control end; 63, second voltage input end; 64, second control end; 7, voltage conversion unit; 71, voltage conversion input end; 72, voltage conversion output end; 8, display unit. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0027] In this paper, the "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0029] In this specification, unless otherwise explicitly specified and limited, the "above" or "below" of the first feature to the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the "above", "above" and "above" of the first feature to the second feature includes the first feature above and oblique above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The "below", "below" and "below" of the first feature to the second feature includes the first feature below and oblique below the second feature, or only indicates that the first feature is less than the second feature in horizontal height.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] like Figure 1 As shown, this embodiment provides a charging circuit for a charging cable, including a power input terminal 1 and a power output terminal 4. The charging circuit further includes: a voltage divider unit 2, the input terminal of which is electrically connected to the power input terminal 1; a switching unit 3, the first connection terminal 31 of which is electrically connected to the output terminal of the voltage divider unit 2, and the second connection terminal 32 of which is electrically connected to the power output terminal 4; a detection unit 5, the first detection terminal 51 of which is electrically connected to the input terminal of the voltage divider unit 2, and the second detection terminal 52 of which is electrically connected to the output terminal of the voltage divider unit 2; and a control unit 6, the signal receiving terminal 61 of which is electrically connected to the signal output terminal 53 of the detection unit 5, and the first control terminal 62 of which is electrically connected to the controlled terminal 33 of the switching unit 3.

[0032] In this embodiment, a voltage divider unit 2 is connected in series between the power input terminal 1 and the power output terminal 4. The detection unit 5 detects the current value passing through the voltage divider unit 2 and converts the current value into a signal output to the control unit 6. When the battery of the connected device is fully charged, the voltage division value of the voltage divider unit 5 will increase, and the current passing through it will naturally increase as well. Therefore, the control unit 6 can determine whether the battery of the connected device is fully charged or whether there is an excessive charging current by judging the magnitude of the current value. The control unit 6 will control the first connection terminal 31 and the second connection terminal 32 of the control unit 3 to disconnect through the first control terminal 62. Since the first connection terminal 31 and the second connection terminal 32 of the control unit 3 are located between the power input terminal 1 and the power output terminal 4, the charging circuit can be disconnected. Therefore, this utility model provides a hardware architecture that can help disconnect the charging circuit of the charging cable when the battery of the connected device is fully charged or when there is an excessive charging current.

[0033] Preferably, such as Figure 3As shown, the switching unit 3 includes a first transistor Q1 and a second field-effect transistor Q2. The base of the first transistor Q1 is electrically connected to the first control terminal 62, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is electrically connected to the gate of the second field-effect transistor Q2, the source of the second field-effect transistor Q2 is electrically connected to the output terminal of the voltage divider unit 2, and the drain of the second field-effect transistor Q2 is electrically connected to the power output terminal 4. The first control terminal 62 can turn on the second field-effect transistor Q2 by controlling the first transistor Q1 to conduct, and can also turn off the second field-effect transistor Q2 by controlling the first transistor Q1 to turn off.

[0034] Specifically, the first control terminal 62 can be Figure 3 The sixth port of the control chip U2, voltage divider unit 2 can be used as... Figure 3 The first resistor R1 in the voltage divider unit 2 is connected to the source of the second field-effect transistor Q2 at the end of the voltage divider unit 2. The power output terminal 4 can be... Figure 3 CON1 port in the middle.

[0035] Preferably, such as Figure 3 As shown, the switching unit 3 further includes a fourth resistor R4 and a first 192 resistor R192. The first end of the fourth resistor R4 is electrically connected to the base of the first transistor Q1, and the second end of the fourth resistor R4 is electrically connected to the emitter of the first transistor Q1. The first end of the first 192 resistor R192 is electrically connected to the first control terminal 62, and the second end of the first 192 resistor R192 is electrically connected to the base of the first transistor Q1.

[0036] Preferably, the voltage divider unit 2 includes a first resistor R1, the first end of the first resistor R1 is electrically connected to the power input terminal 1, and the second end of the first resistor R1 is electrically connected to the first connection terminal 31.

[0037] Preferably, the detection unit 5 includes a detection chip U3 and a pull-up resistor. The signal output terminal of the detection chip U3 is electrically connected to the signal receiving terminal 61 of the control unit 6. The first terminal of the pull-up resistor is electrically connected to the signal output terminal of the detection chip U3, and the second terminal of the pull-up resistor is electrically connected to the power input terminal 1.

[0038] Preferably, such as Figure 2As shown, the charging circuit also includes a transformer unit 7. The transformer input terminal 71 of the transformer unit 7 is electrically connected to the power input terminal 1, and the transformer output terminal 72 of the transformer unit 7 is electrically connected to the first voltage input terminal 54 of the detection unit 5 and the second voltage input terminal 63 of the control unit 6. Power is supplied to the control unit 6 and the detection unit 5 through the transformer unit 7.

[0039] Preferably, such as Figure 3 As shown, the transformer unit 7 includes a step-down chip U1, a first capacitor C1, and a second capacitor C2. The input terminal of the step-down chip U1 is electrically connected to the power input terminal 1, and the output terminal of the step-down chip U1 is electrically connected to the first voltage input terminal 54 of the detection unit 5 and the second voltage input terminal 63 of the control unit 6. The ground terminal of the step-down chip U1 is grounded. The first terminal of the first capacitor C1 is electrically connected to the input terminal of the step-down chip U1, and the second terminal of the first capacitor C1 is grounded. The first terminal of the second capacitor C2 is electrically connected to the output terminal of the step-down chip U1, and the second terminal of the second capacitor C2 is grounded.

[0040] Preferably, such as Figure 2 As shown, the charging circuit also includes a display unit 8. The first end of the display unit 8 is electrically connected to the transformer output terminal 72, and the second end of the display unit 8 is electrically connected to the second control terminal of the control unit 6. In cases where the connected device's battery is fully charged or the charging current is too high, the display unit can be controlled to light up, indicating to the user that charging is complete or the socket has been disconnected.

[0041] Preferably, such as Figure 3 As shown, the display unit 8 includes a fifth resistor R5 and a first light-emitting diode D1. The first end of the fifth resistor R5 is electrically connected to the transformer output terminal 72, the second end of the fifth resistor R5 is electrically connected to the positive terminal of the first light-emitting diode D1, and the negative terminal of the first light-emitting diode D1 is electrically connected to the second control terminal of the control unit 6. Therefore, the brightness or darkness of the first light-emitting diode D1 can be controlled by controlling its conductivity.

[0042] This embodiment also provides a charging cable, including a charging circuit for a charging cable as described in any of the above embodiments.

[0043] The charging cable provided in this embodiment uses a voltage divider unit 2 connected in series between the power input terminal 1 and the power output terminal 4. The detection unit 5 detects the current value passing through the voltage divider unit 2 and converts the current value into a signal output to the control unit 6. When the battery of the connected device is fully charged, the voltage division value of the voltage divider unit 5 will increase, and the current passing through it will naturally increase as well. Therefore, the control unit 6 can determine whether the battery of the connected device is fully charged or whether there is an excessive charging current by judging the magnitude of the current value. The control unit 6 will then control the first connection terminal 31 and the second connection terminal 32 of the control switch unit 3 to disconnect through the first control terminal 62. Since the first connection terminal 31 and the second connection terminal 32 of the control switch are located between the power input terminal 1 and the power output terminal 4, the charging circuit can be disconnected. Therefore, this utility model provides a charging cable that can help disconnect the charging circuit when the battery of the connected device is fully charged or when there is an excessive charging current.

[0044] It should be noted that the terms "horizontal" and "vertical" do not imply that the components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. Similarly, the terms "parallel" and "perpendicular" do not imply that the components are absolutely parallel or perpendicular, but rather that they can have a certain angular deviation. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted. Furthermore, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] It is understood that the term "multiple" in this document means at least two, such as two, three, etc., unless otherwise specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0046] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A charging circuit for a charging cable, comprising a power input terminal (1) and a power output terminal (4), characterized in that, The charging circuit also includes: Voltage divider unit (2), the input terminal of the voltage divider unit (2) is electrically connected to the power input terminal (1); The first connection terminal (31) of the switching unit (3) is electrically connected to the output terminal of the voltage divider unit (2), and the second connection terminal (32) of the switching unit (3) is electrically connected to the power output terminal (4). The detection unit (5) has its first detection terminal (51) electrically connected to the input terminal of the voltage divider unit (2), and its second detection terminal (52) electrically connected to the output terminal of the voltage divider unit (2). Control unit (6), the signal receiving end (61) of the control unit (6) is electrically connected to the signal output end (53) of the detection unit (5), and the first control end (62) of the control unit (6) is electrically connected to the controlled end (33) of the switch unit (3); The switching unit (3) includes a first transistor Q1 and a second field-effect transistor Q2. The base of the first transistor Q1 is electrically connected to the first control terminal (62). The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is electrically connected to the gate of the second field-effect transistor Q2. The source of the second field-effect transistor Q2 is electrically connected to the output terminal of the voltage divider unit (2). The drain of the second field-effect transistor Q2 is electrically connected to the power output terminal (4). The switching unit (3) further includes a fourth resistor R4 and a first ninety-second resistor R192. The first end of the fourth resistor R4 is electrically connected to the base of the first transistor Q1, and the second end of the fourth resistor R4 is electrically connected to the emitter of the first transistor Q1. The first end of the first ninety-second resistor R192 is electrically connected to the first control terminal (62), and the second end of the first ninety-second resistor R192 is electrically connected to the base of the first transistor Q1.

2. The charging circuit for a charging cable according to claim 1, characterized in that, The voltage divider unit (2) includes a first resistor R1, the first end of the first resistor R1 is electrically connected to the power input terminal (1), and the second end of the first resistor R1 is electrically connected to the first connection terminal (31).

3. A charging circuit for a charging cable according to claim 1, characterized in that, The detection unit (5) includes a detection chip U3 and a pull-up resistor. The signal output terminal of the detection chip U3 is electrically connected to the signal receiving terminal (61) of the control unit (6). The first end of the pull-up resistor is electrically connected to the signal output terminal of the detection chip U3, and the second end of the pull-up resistor is electrically connected to the power input terminal (1).

4. A charging circuit for a charging cable according to claim 1, characterized in that, The charging circuit also includes a transformer unit (7), the transformer input terminal (71) of the transformer unit (7) is electrically connected to the power input terminal (1), and the transformer output terminal (72) of the transformer unit (7) is electrically connected to the first voltage input terminal (54) of the detection unit (5) and the second voltage input terminal (63) of the control unit (6).

5. A charging circuit for a charging cable according to claim 4, characterized in that, The transformer unit (7) includes a step-down chip U1, a first capacitor C1, and a second capacitor C2. The input terminal of the step-down chip U1 is electrically connected to the power input terminal (1). The output terminal of the step-down chip U1 is electrically connected to the first voltage input terminal (54) of the detection unit (5) and the second voltage input terminal (63) of the control unit (6). The ground terminal of the step-down chip U1 is grounded. The first terminal of the first capacitor C1 is electrically connected to the input terminal of the step-down chip U1, and the second terminal of the first capacitor C1 is grounded. The first terminal of the second capacitor C2 is electrically connected to the output terminal of the step-down chip U1, and the second terminal of the second capacitor C2 is grounded.

6. A charging circuit for a charging cable according to claim 4, characterized in that, The charging circuit also includes a display unit (8), the first end of which is electrically connected to the transformer output terminal (72), and the second end of which is electrically connected to the second control terminal of the control unit (6).

7. A charging circuit for a charging cable according to claim 6, characterized in that, The display unit (8) includes a fifth resistor R5 and a first light-emitting diode D1. The first end of the fifth resistor R5 is electrically connected to the transformer output terminal (72), the second end of the fifth resistor R5 is electrically connected to the positive terminal of the first light-emitting diode D1, and the negative terminal of the first light-emitting diode D1 is electrically connected to the second control terminal of the control unit (6).

8. A charging cable, characterized in that: Includes a charging circuit for a charging cable as described in any one of claims 1-7.

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