Charging circuit of interphone

Abstract

The utility model provides a charging circuit of an interphone, comprising a Type-C interface, a ZCC6982 charging management chip and a lithium battery, the ZCC6982 charging management chip is externally connected with a boost conversion circuit, an input current limiting circuit, an interphone mainboard temperature detection circuit and a power supply output line; a power supply pin of the Type-C interface is connected with the boost conversion circuit, and the lithium battery is connected with the power supply output line. The charging circuit of the interphone is internally provided with the ZCC6982 charging management chip, the ZCC6982 charging management chip is externally connected with the boost conversion circuit, the input current limiting circuit and the interphone mainboard temperature detection circuit to control the charging process of the interphone, and the charging safety of the interphone is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of walkie - talkies, and particularly to a charging circuit for a walkie - talkie. Background Art

[0002] As an important wireless communication tool, a walkie - talkie can communicate by pressing the PTT key without any network support, and is mainly applied to industries such as transportation, cement engineering, and building property. However, during the battery charging and use of traditional walkie - talkies, there is often a lack of effective protection for the battery, which easily leads to problems such as over - charging, over - discharging, and over - heating of the battery, affecting the service life of the battery and even potentially causing safety accidents. Therefore, it is necessary to design a walkie - talkie with internal charging protection to improve the safety and service life of the battery. Summary of the Utility Model

[0003] The utility model provides a charging circuit for a walkie - talkie, aiming to solve the technical problems mentioned in the background art of the existing technology eyepiece.

[0004] The technical solution of the utility model is as follows:

[0005] A charging circuit for a walkie - talkie includes a Type - C interface, a ZCC6982 charging management chip, and a lithium battery. An external boost conversion circuit, an input current limiting circuit, a walkie - talkie main board temperature detection circuit, and a power supply output line are connected to the ZCC6982 charging management chip; the power supply pin of the Type - C interface is connected to the boost conversion circuit, and the lithium battery is connected to the power supply output line.

[0006] In an optional embodiment of the utility model, the boost conversion circuit includes a power inductor and a first capacitor. Two ends of the power inductor are respectively connected to the SVI N pin and the LX pin of the ZCC6982 charging management chip through a first line and a second line, and the first capacitor is respectively connected to the BST pin of the ZCC6982 charging management chip and the second line through a third line and a fourth line; the power supply pin of the Type - C interface is connected to the first line through a fifth line.

[0007] In an optional embodiment of the utility model, the input current limiting circuit includes a first resistor and a second resistor. Two ends of the first resistor are respectively connected to the fifth line and the ILIM pin of the ZCC6982 charging management chip through a sixth line and a seventh line; one end of the second resistor is connected to the seventh line through an eighth line, and the other end of the second resistor is grounded through a ninth line.

[0008] In an alternative embodiment of the present utility model, the temperature detection circuit of the walkie-talkie main board includes an NTC thermistor, a third resistor, a fourth resistor, a fifth resistor, and a second capacitor. Two ends of the third resistor are respectively connected to the VDD pin and the NTC pin of the ZCC6982 charging management chip through a tenth line and an eleventh line;

[0009] Two ends of the fourth resistor are respectively connected to the ICHC pin of the power management chip and the ground through a twelfth line and a thirteenth line;

[0010] Two ends of the second capacitor are respectively connected to the tenth line and the thirteenth line through a fourteenth line and a fifteenth line;

[0011] Two ends of the fifth resistor are respectively connected to the eleventh line and the first end of the NTC thermistor through a sixteenth line and a seventeenth line, and the second end of the NTC thermistor is grounded through an eighteenth line.

[0012] In an alternative embodiment of the present utility model, an electrostatic protection circuit is connected to a branch of the fifth line. The electrostatic protection circuit includes a bidirectional TVS tube. One end of the bidirectional TVS tube is connected to the fifth line through a nineteenth line, and the other end of the bidirectional TVS tube is grounded through a twentieth line.

[0013] In an alternative embodiment of the present utility model, a first filtering circuit is further connected to a branch of the fifth line. The first filtering circuit includes a third capacitor and a sixth resistor. Two ends of the third capacitor are respectively connected to the fifth line and the first end of the sixth resistor through a twenty-first line and a twenty-second line, and the second end of the sixth resistor is grounded through a twenty-third line.

[0014] In an alternative embodiment of the present utility model, a second filtering circuit is connected to a branch of the power supply output line. The second filtering circuit includes a fourth capacitor and a fifth capacitor. Two ends of the fourth capacitor are respectively connected to the power supply output line and the ground through a twenty-fourth line and a twenty-fifth line, and two ends of the fifth capacitor are respectively connected to the twenty-fourth line and the ground through a twenty-sixth line and a twenty-seventh line.

[0015] The beneficial effects are as follows: The present utility model provides a charging circuit for a walkie-talkie, which includes a Type-C interface, a ZCC6982 charging management chip, and a lithium battery. An external boost conversion circuit, an input current limiting circuit, a walkie-talkie main board temperature detection circuit, and a power supply output line are connected to the ZCC6982 charging management chip; the power supply pin of the Type-C interface is connected to the boost conversion circuit, and the lithium battery is connected to the power supply output line. The charging circuit of the walkie-talkie in the present utility model is internally provided with a ZCC6982 charging management chip, and an external boost conversion circuit, an input current limiting circuit, and a walkie-talkie main board temperature detection circuit are used to control the charging process of the walkie-talkie, improving the safety during the charging of the walkie-talkie. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the composition of a charging circuit for a walkie-talkie according to the present utility model.

[0017] Figure 2 It is a schematic circuit diagram of a charging circuit for a walkie-talkie according to the present utility model.

[0018] The reference numerals in the figure are as follows:

[0019] 10 - Type-C interface; 20 - ZCC6982 charging management chip; 30 - lithium battery; 40 - boost conversion circuit; 50 - input current limiting circuit; 60 - walkie-talkie main board temperature detection circuit; 70 - power supply output line; 80 - power inductor; 90 - first capacitor; 100 - first resistor; 110 - second resistor; 120 - NTC thermistor; 130 - third resistor; 140 - fourth resistor; 150 - fifth resistor; 160 - second capacitor; 170 - bidirectional TVS tube; 180 - third capacitor; 190 - sixth resistor; 200 - fourth capacitor; 210 - fifth capacitor. Detailed Embodiment

[0020] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present utility model clearer and more understandable, the following further details the present application in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0023] Throughout the specification, reference to "an embodiment" or "embodiments" means that the specific features, structures, or characteristics described in connection with the embodiments are included in at least one embodiment of the present application. Thus, the phrases "in an embodiment" or "in some embodiments" appearing throughout the specification do not all refer to the same embodiment. In addition, in one or more embodiments, the specific features, structures, or characteristics may be combined in any suitable manner.

[0024] See Figure 1 , the present utility model provides a charging circuit for a walkie-talkie, including a Type-C interface 10, a ZCC6982 charging management chip 20, and a lithium battery 30. An external boost conversion circuit 40, an input current limiting circuit 50, a walkie-talkie main board temperature detection circuit 60, and a power supply output line 70 are connected to the ZCC6982 charging management chip 20; the power supply pin (VBUS pin) of the Type-C interface 10 is connected to the boost conversion circuit 40, and the lithium battery 30 is connected to the power supply output line 70.

[0025] See Figure 2, in an alternative embodiment of the present utility model, the boost conversion circuit 40 includes a power inductor 80 and a first capacitor 90. Two ends of the power inductor 80 are respectively connected to the SVI N pin and the LX pin of the ZCC6982 charging management chip 20 through a first line and a second line. The first capacitor 90 is respectively connected to the BST pin of the ZCC6982 charging management chip 20 and the second line through a third line and a fourth line; a power supply pin of the Type-C interface 10 is connected to the first line through a fifth line. In the present utility model, after J11, the TYPE-C charging port, is connected to a 5V / 1A adapter, a DC / DC is formed by the lithium battery charging management chip U8 (ZCC6982), the power inductor L7 (SWPA4020S2R2NT, 2.2uH), and the capacitor C22 (0.1uF) to boost the voltage to 8.4V.

[0026] See Figure 2 , in an alternative embodiment of the present utility model, the input current limiting circuit 50 includes a first resistor 100 and a second resistor 110. Two ends of the first resistor 100 are respectively connected to the fifth line and the ILIM pin of the ZCC6982 charging management chip 20 through a sixth line and a seventh line; one end of the second resistor 110 is connected to the seventh line through an eighth line, and the other end of the second resistor 110 is grounded through a ninth line. In the present utility model, the 10th pin (ILIM pin) of the charging management chip U8 (ZCC6982) is an adaptive input current limit setting pin. After judging the voltage division value formed by R121 (10K) and R120 (4.7K), different charging currents are output for the device.

[0027] See Figure 2, in an alternative embodiment of the present utility model, the walkie-talkie main board temperature detection circuit 60 includes an NTC thermistor 120, a third resistor 130, a fourth resistor 140 (R22 (1K)), a fifth resistor 150, and a second capacitor 160. Both ends of the third resistor 130 are respectively connected to the VDD pin and the NTC pin of the ZCC6982 charging management chip 20 through a tenth line and an eleventh line; both ends of the fourth resistor 140 are respectively connected to the ICHC pin of the power management chip 20 and the ground through a twelfth line and a thirteenth line; both ends of the second capacitor 160 (2.2 μF) are respectively connected to the tenth line and the thirteenth line through a fourteenth line and a fifteenth line; both ends of the fifth resistor 150 are respectively connected to the eleventh line and the first end of the NTC thermistor 120 through a sixteenth line and a seventeenth line, and the second end of the NTC thermistor 120 is grounded through an eighteenth line. In the present utility model, the NTC thermistor on the 1st pin (NTC pin) of the charging management chip U8 (ZCC6982) is the built-in temperature detection pin of the walkie-talkie. The R119 (10K) is a negative temperature coefficient NTC thermistor (10K), which, together with R118 (16K) and R117 (3K), constitutes a sampling circuit. During the charging process, the lithium battery charging management chip continuously monitors the voltage change of the NTC pin to determine the actual temperature of the walkie-talkie main board. The typical value of the under-temperature threshold is 65% VDD corresponding to an environment of 0 °C, and the typical value of the over-temperature threshold is 25% VDD corresponding to an environment of 60 °C. During the charging process, if the ambient temperature change exceeds the range of 0 °C to 60 °C, the chip will stop working and no charging current will be output.

[0028] See Figure 2 , in an alternative embodiment of the present utility model, an electrostatic protection circuit is connected to the upper branch of the fifth line. The electrostatic protection circuit includes a bidirectional TVS tube 170. One end of the bidirectional TVS tube 170 is connected to the fifth line through a nineteenth line, and the other end of the bidirectional TVS tube 170 is grounded through a twentieth line. In the appendix of the present utility model Figure 2 , D25 (ESD5411 N), D26, and D28 are bidirectional TVS tubes for electrostatic protection.

[0029] See Figure 2, in an alternative embodiment of the present utility model, a first filter circuit is further connected to the upper branch of the fifth line. The first filter circuit includes a third capacitor 180 and a sixth resistor 190. Two ends of the third capacitor 180 are respectively connected to the fifth line and the first end of the sixth resistor through a twenty-first line and a twenty-second line, and the second end of the sixth resistor 190 is grounded through a twenty-third line. A second filter circuit is connected to the upper branch of the power supply output line 70. The second filter circuit includes a fourth capacitor 200 and a fifth capacitor 210. Two ends of the fourth capacitor 200 are respectively connected to the power supply output line 70 and ground through a twenty-fourth line and a twenty-fifth line, and two ends of the fifth capacitor 210 are respectively connected to the twenty-fourth line and ground through a twenty-sixth line and a twenty-seventh line. In the present utility model, C23 (1 μF / 16V), R37 (1R), C19 (10 μF / 16V), C120 (10 μF / 16V), C26 (1 μF / 16V) are filter circuits, and the TYPE-C charging circuit includes peripherals TXDO and RXDO which are serial communication circuits.

[0030] In summary, the present utility model provides a charging circuit for a walkie-talkie, which includes a Type-C interface, a ZCC6982 charging management chip, and a lithium battery. A boost conversion circuit, an input current limiting circuit, a walkie-talkie main board temperature detection circuit, and a power supply output line are externally connected to the ZCC6982 charging management chip; the power supply pin of the Type-C interface is connected to the boost conversion circuit, and the lithium battery is connected to the power supply output line. The charging circuit of the walkie-talkie of the present utility model is internally provided with a ZCC6982 charging management chip, and a boost conversion circuit, an input current limiting circuit, and a walkie-talkie main board temperature detection circuit are externally connected to the ZCC6982 charging management chip to control the charging process of the walkie-talkie, thereby improving the safety during the charging of the walkie-talkie.

[0031] Although the present utility model has been disclosed above with preferred embodiments, the above preferred embodiments are not intended to limit the present utility model. Those of ordinary skill in the art can make various modifications and refinements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model is subject to the scope defined by the claims.

Claims

1. A charging circuit for a walkie-talkie, characterized in that: It includes a Type-C interface, a ZCC6982 charging management chip and a lithium battery. The ZCC6982 charging management chip is externally connected to a boost conversion circuit, an input current limiting circuit, a walkie-talkie mainboard temperature detection circuit and a power supply output line; the power supply pin of the Type-C interface is connected to the boost conversion circuit, and the lithium battery is connected to the power supply output line.

2. The charging circuit of the intercom according to claim 1, characterized in that: The boost conversion circuit includes a power inductor and a first capacitor, the two ends of the power inductor are connected to the SVIN pin and the LX pin of the ZCC6982 charging management chip through a first line and a second line respectively, the first capacitor is connected to the BST pin and the second line of the ZCC6982 charging management chip through a third line and a fourth line respectively; the power supply pin of the Type-C interface is connected to the first line through a fifth line.

3. The charging circuit of the intercom according to claim 2, characterized in that: The input current limiting circuit includes a first resistor and a second resistor, wherein both ends of the first resistor are connected to the fifth circuit and the ILIM pin of the ZCC6982 charging management chip through a sixth circuit and a seventh circuit respectively; one end of the second resistor is connected to the seventh circuit through an eighth circuit, and the other end of the second resistor is grounded through a ninth circuit.

4. The charging circuit of the intercom according to claim 3, characterized in that: The intercom mainboard temperature detection circuit includes an NTC thermistor, a third resistor, a fourth resistor, a fifth resistor and a second capacitor, and the two ends of the third resistor are connected to the VDD pin and the NTC pin of the ZCC6982 charging management chip through the tenth line and the eleventh line respectively; Two ends of the fourth resistor are connected to the ICHC pin of the power management chip and ground through the twelfth line and the thirteenth line respectively; Two ends of the second capacitor are connected to the tenth circuit and the thirteenth circuit via a fourteenth circuit and a fifteenth circuit respectively; Two ends of the fifth resistor are connected to the eleventh circuit and the first end of the NTC thermistor through the sixteenth circuit and the seventeenth circuit respectively, and the second end of the NTC thermistor is grounded through the eighteenth circuit.

5. The charging circuit of the intercom according to claim 4, characterized in that: The branch on the fifth line is connected to an electrostatic protection circuit, and the electrostatic protection circuit includes a bidirectional TVS tube. One end of the bidirectional TVS tube is connected to the fifth line through the nineteenth line, and the other end of the bidirectional TVS tube is grounded through the twentieth line.

6. The charging circuit of the intercom according to claim 5, characterized in that: The branch on the fifth line is also connected to a first filtering circuit, which includes a third capacitor and a sixth resistor. Both ends of the third capacitor are connected to the fifth line and the first end of the sixth resistor through a twenty-first line and a twenty-second line respectively, and the second end of the sixth resistor is grounded through a twenty-third line.

7. The charging circuit of the intercom according to claim 6, characterized in that: A branch on the power supply output line is connected to a second filtering circuit, and the second filtering circuit includes a fourth capacitor and a fifth capacitor. Both ends of the fourth capacitor are connected to the power supply output line and ground through a twenty-fourth line and a twenty-fifth line respectively, and both ends of the fifth capacitor are connected to the twenty-fourth line and ground through a twenty-sixth line and a twenty-seventh line respectively.

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