CN219627419U - Power supply path switching device - Google Patents
Power supply path switching device Download PDFInfo
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- CN219627419U CN219627419U CN202320502975.9U CN202320502975U CN219627419U CN 219627419 U CN219627419 U CN 219627419U CN 202320502975 U CN202320502975 U CN 202320502975U CN 219627419 U CN219627419 U CN 219627419U
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Abstract
The utility model belongs to the technical field of instruments and meters, and particularly relates to a power path switching device, which comprises: an interface voltage terminal; a battery voltage terminal; the comparison module is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the interface voltage end, and the second input end is connected with the battery voltage end; the switching module comprises a switching unit, wherein a first end of the switching unit is connected with the output end, a second end of the switching unit is connected with the battery voltage end, and a third end of the switching unit is connected with the voltage input end and the interface voltage end respectively. The device adopts the mutual cooperation of the comparison module and the switching module to realize the power supply switching between the battery voltage end and the interface voltage end, so that the circuit structure is simple, the components are few, and the manufacturing cost is low.
Description
Technical Field
The utility model relates to the technical field of instruments and meters, in particular to a power supply path switching device.
Background
In a handheld intelligent device, a lithium ion battery is usually provided to supply power to the device, and meanwhile, the device also has a USB interface or a Type-C interface to charge the lithium ion battery. In general, when the USB interface or the Type-C interface is connected to the charger, the power of the device is switched from the battery terminal to the interface terminal.
In the related art, the power path switching device has a complex circuit structure, many components and high manufacturing cost.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
In view of at least one of the above technical problems, the present utility model provides a power path switching device, which solves the problems of complex circuit structure, more components and high manufacturing cost of the power path switching device in the related art.
An embodiment of the present utility model provides a power path switching device, including:
an interface voltage terminal;
a battery voltage terminal;
the comparison module is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the interface voltage end, and the second input end is connected with the battery voltage end;
the switching module comprises a switching unit, wherein a first end of the switching unit is connected with the output end, a second end of the switching unit is connected with the battery voltage end, and a third end of the switching unit is connected with the voltage input end and the interface voltage end respectively.
The embodiment of the utility model has the following technical effects: the device adopts the mutual cooperation of the comparison module and the switching module to realize the power supply switching between the battery voltage end and the interface voltage end, so that the circuit structure is simple, the components are few, and the manufacturing cost is low.
In one implementation, a first voltage dividing module is disposed between the first input terminal and the interface voltage terminal.
In one implementation, the first voltage dividing module includes a second resistor, a fifth resistor and a first node, a first end of the second resistor is connected to the interface voltage end, a second end of the second resistor, a first end of the fifth resistor is connected to the first node, a second end of the fifth resistor is grounded, and the first node is connected to the first input end.
In one implementation, a first capacitor is provided between the first node and the second end of the fifth resistor.
In one implementation, a second voltage dividing module is disposed between the second input terminal and the battery voltage terminal.
In one implementation, the second voltage dividing module includes a first resistor, a fourth resistor, and a second node, where the first end of the first resistor is connected to the battery voltage terminal, the second end of the first resistor, the first end of the fourth resistor is connected to the second node, the second end of the fourth resistor is grounded, and the second node is connected to the second input terminal.
In one implementation, a second capacitor is provided between the second node and the second end of the fourth resistor.
In one implementation, the switching unit includes a first field effect transistor, a gate of the first field effect transistor is connected to the output terminal, a source of the first field effect transistor is connected to the battery voltage terminal, and a drain of the first field effect transistor is connected to the voltage input terminal and the interface voltage terminal, respectively.
The utility model will be further described with reference to the drawings and examples.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will briefly explain the embodiments or the drawings needed in the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present utility model and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a power path switching device according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of a power path switching device according to an embodiment of the present utility model;
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.
In a handheld intelligent device, a lithium ion battery is usually provided to supply power to the device, and meanwhile, the device also has a USB interface or a Type-C interface to charge the lithium ion battery. In general, when the USB interface or the Type-C interface is connected to the charger, the power of the device is switched from the battery terminal to the interface terminal. In the related art, the power path switching device has a complex circuit structure, many components and high manufacturing cost. The device adopts the mutual cooperation of the comparison module and the switching module to realize the power supply switching between the battery voltage end and the interface voltage end, so that the circuit structure is simple, the components are few, and the manufacturing cost is low.
The power path switching device provided by the embodiment of the utility model can be applied to all handheld devices, and the handheld devices are provided with batteries and interfaces for supplying power, and the handheld devices can be an infrared camera, a thermometer, a digital multimeter, an insulation resistance tester, a grounding resistance tester and the like without specific limitation.
Referring to fig. 1 and fig. 2, fig. 1 is a block diagram of a power path switching device according to an embodiment of the present utility model; fig. 2 is a circuit diagram of a power path switching device according to an embodiment of the present utility model; an embodiment of the present utility model provides a power path switching device, including: the comparison module 100 and the switching module 200.
With reference to fig. 1 and 2, the following describes a specific circuit structure and a principle of the power path switching device.
The interface voltage terminal VBUS is provided with voltage by the USB power supply, the range of the provided voltage value is 5±0.25V, and the voltage value of the interface voltage terminal VBUS is greater than the voltage value of the battery voltage terminal VBAT.
And a battery voltage end VBAT, wherein the positive electrode of the lithium ion battery provides voltage.
The comparison module 100 has a first input terminal in+ connected to the interface voltage terminal VBUS, a second input terminal IN-connected to the battery voltage terminal VBAT, and an output terminal VOUT;
the switching module 200 includes a switching unit, a first end of the switching unit is connected to the output terminal VOUT, a second end of the switching unit is connected to the battery voltage terminal VBAT, and a third end of the switching unit is connected to the voltage input terminal and the interface voltage terminal VBUS, respectively.
In a normal state, the handheld device with the power path switching device provided by the embodiment of the utility model is powered by a lithium ion battery. When the handheld device is connected to the USB power supply, the switching module 200 switches the switching voltage input terminal from the battery voltage terminal VBAT to the interface voltage terminal VBUS.
Referring to fig. 2 IN combination, the comparison module 100 may include a first chip U1, where the first chip U1 has a first input terminal in+ connected to the interface voltage terminal VBUS, a second input terminal IN-connected to the battery voltage terminal VBAT, and an output terminal VOUT.
For example, when the interface voltage terminal VBUS has no voltage input, the first chip U1 does not operate, and the output terminal VOUT of the first chip U1 is in a high-impedance state. At this time, the switching unit is turned on, and the voltage input terminal is supplied with power from the battery voltage terminal VBAT.
For another example, when the voltage of the interface voltage terminal VBUS is input, the first chip U1 operates, the voltage value of the interface voltage terminal VBUS is greater than the voltage value of the battery voltage terminal VBAT, the output terminal VOUT of the first chip U1 outputs a high level, and the output voltage value is the voltage of the interface voltage terminal VBUS. At this time, the switching unit is not turned on, and the voltage input terminal is supplied with the interface voltage terminal VBUS.
In other implementations, the comparison module 100 may also be an IC device that performs a comparison function, which is not specifically limited herein.
IN some examples, referring to fig. 2 IN combination, a first voltage dividing module 300 is disposed between the first input terminal in+ and the interface voltage terminal VBUS. When the USB power is connected to the handheld device, the voltage of the interface voltage terminal VBUS is input to the first input terminal in+ through the first voltage dividing module 300, so that the voltage of the interface voltage terminal VBUS is divided.
Specifically, the first voltage dividing module 300 may include a second resistor R2, a fifth resistor R5, and a first node a, where a first end of the second resistor R2 is connected to the interface voltage terminal VBUS, a second end of the second resistor R2, a first end of the fifth resistor R5 is connected to the first node a, a second end of the fifth resistor R5 is grounded, and the first node a is connected to the first input terminal in+. A first capacitor C1 is disposed between the first node a and the second end of the fifth resistor R5. The first capacitor C1 is used for filtering.
IN some examples, referring IN conjunction to fig. 2, a second voltage dividing module 400 is disposed between the second input terminal IN-and the battery voltage terminal VBAT. The voltage of the battery voltage terminal VBAT is inputted to the second input terminal IN-through the second voltage dividing module 400, thus dividing the voltage of the battery voltage terminal VBAT.
Specifically, the second voltage dividing module 400 includes a first resistor R1, a fourth resistor R4, and a second node b, where a first end of the first resistor R1 is connected to the battery voltage terminal VBAT, a second end of the first resistor R1, a first end of the fourth resistor R4 is connected to the second node b, a second end of the fourth resistor R4 is grounded, and the second node b is connected to the second input terminal IN-. A second capacitor C2 is disposed between the second node b and the second end of the fourth resistor R4. The second capacitor C2 is used for filtering.
In some examples, referring to fig. 1 and 2 in combination, the switching unit includes a first fet Q1, a gate of the first fet Q1 is connected to the output terminal VOUT, a source of the first fet Q1 is connected to the battery voltage terminal VBAT, and a drain of the first fet Q1 is connected to the voltage input terminal and the interface voltage terminal VBUS, respectively.
Specifically, the first field effect transistor Q1 is a PMOS transistor.
Referring to fig. 2 in combination, the drain of the first field effect transistor Q1 is connected to the interface voltage terminal VBUS through a first diode D1, where the anode of the first diode D1 is connected to the interface voltage terminal VBUS, and the cathode of the first diode D1 is connected to the drain of the first field effect transistor Q1. Thus, the voltage of the battery voltage terminal VBAT can be ensured not to flow into the interface voltage terminal VBUS.
Referring to fig. 2 in combination, a third voltage dividing module 500 is connected to the gate of the first field effect transistor Q1, the third voltage dividing module 500 includes a third resistor R3 and a sixth resistor R6, a first end of the third resistor R3 is connected to the output terminal VOUT of the first chip U1, a second end of the third resistor R3 is connected to the gate of the first field effect transistor Q1, a first end of the sixth resistor R6 is connected to the gate of the field effect transistor, and a second end of the sixth resistor R6 is grounded.
Referring to fig. 2 again, when the handheld device is not connected to the USB power supply, the first chip U1 is not in operation, the output terminal VOUT of the first chip U1 is in a high-resistance state, the gate of the first field effect transistor Q1 is pulled to a low level by the sixth resistor R6, and at this time, the voltage of the source of the first field effect transistor Q1 is greater than the voltage of the drain, so that the source and the drain of the first field effect transistor Q1 are turned on, and the voltage input terminal is powered by the battery voltage terminal VBAT.
When the handheld device is connected with the USB power supply, the first chip U1 is electrified, the battery voltage end VBAT is input into the second input end IN-through the voltage division of the first resistor R1 and the fourth resistor R4, the interface voltage end VBUS is input into the first input end IN+ through the voltage division of the second resistor R2 and the fifth resistor R5, and the resistance values of the first resistor R1, the second resistor R2, the fourth resistor R4 and the fifth resistor R5 are the same, and the voltage value of the interface voltage end VBUS is larger than the voltage value of the battery voltage end VBAT, so that the output end VOUT of the first chip U1 outputs a high level, and the output voltage value is the voltage value of the interface voltage end VBUS. The output end VOUT of the first chip U1 is divided by the third resistor R3 and the sixth resistor R6, so that the gate of the first field effect transistor Q1 is larger than the source voltage, the source and the drain of the first field effect are disconnected, and the voltage input end is supplied with power by the interface voltage end VBUS.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above is merely a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present utility model. Therefore, all equivalent changes according to the shape, structure and principle of the present utility model are covered in the protection scope of the present utility model.
Claims (8)
1. A power path switching device, comprising:
an interface voltage terminal;
a battery voltage terminal;
the comparison module is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the interface voltage end, and the second input end is connected with the battery voltage end;
the switching module comprises a switching unit, wherein a first end of the switching unit is connected with the output end, a second end of the switching unit is connected with the battery voltage end, and a third end of the switching unit is connected with the voltage input end and the interface voltage end respectively.
2. The power path switching device according to claim 1, wherein a first voltage dividing module is disposed between the first input terminal and the interface voltage terminal.
3. The power path switching device according to claim 2, wherein the first voltage dividing module comprises a second resistor, a fifth resistor and a first node, the first end of the second resistor is connected to the interface voltage end, the second end of the second resistor, the first end of the fifth resistor is connected to the first node, the second end of the fifth resistor is grounded, and the first node is connected to the first input end.
4. A power path switching device according to claim 3, wherein a first capacitance is provided between the first node and the second end of the fifth resistor.
5. The power path switching device according to claim 1, wherein a second voltage dividing module is provided between the second input terminal and the battery voltage terminal.
6. The power path switching device according to claim 5, wherein the second voltage dividing module comprises a first resistor, a fourth resistor, and a second node, the first end of the first resistor is connected to the battery voltage terminal, the second end of the first resistor, the first end of the fourth resistor is connected to the second node, the second end of the fourth resistor is grounded, and the second node is connected to the second input terminal.
7. The power path switching device of claim 6, wherein a second capacitor is provided between the second node and the second end of the fourth resistor.
8. The power path switching device according to claim 1, wherein the switching unit comprises a first field effect transistor, a gate of the first field effect transistor is connected to the output terminal, a source of the first field effect transistor is connected to the battery voltage terminal, and a drain of the first field effect transistor is connected to the voltage input terminal and the interface voltage terminal, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320502975.9U CN219627419U (en) | 2023-03-15 | 2023-03-15 | Power supply path switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320502975.9U CN219627419U (en) | 2023-03-15 | 2023-03-15 | Power supply path switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219627419U true CN219627419U (en) | 2023-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320502975.9U Active CN219627419U (en) | 2023-03-15 | 2023-03-15 | Power supply path switching device |
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| Country | Link |
|---|---|
| CN (1) | CN219627419U (en) |
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- 2023-03-15 CN CN202320502975.9U patent/CN219627419U/en active Active
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