Input and output shared power supply circuit for low-power-consumption Internet of Things equipment

Abstract

The utility model discloses an input and output shared power supply circuit for low-power-consumption Internet of Things equipment, which relates to the technical field of electronics and comprises a power supply module which comprises an external interface P1 used for connecting an external power supply and a communication module. The switching circuit is turned on or off according to whether an external power supply is connected or not. And the comparison circuit is connected with the external interface P1 and the voltage division circuit and controls the switching circuit to be switched on according to the voltage output by the voltage division circuit. The voltage division circuit is used for outputting different voltages to the comparison circuit. When an external power supply is input, the low-power-consumption internet-of-things equipment can input the external power supply, and when the external power supply is not available or the external power supply is interrupted on site, the low-power-consumption internet-of-things equipment can perform transient output processing of the internal power supply module, and outputs the power supply to other external equipment for power supply. And normal communication with the external equipment is further completed.

Description

Technical Field

[0001] The utility model belongs to the field of electronic technology, and specifically relates to an input and output shared power supply circuit for low-power Internet of Things equipment. Background Art

[0002] Currently, low-power IoT devices are generally battery-powered. Typically, these devices need to communicate with other devices. Other devices, such as low-power flow meters, are battery-powered and require an external power source to power their communication interfaces. If an external power source is available on-site, both the low-power IoT device and the other devices can be powered simultaneously to meet the communication power requirements. However, if no external power source is available on-site and the other devices require external power for communication, the low-power IoT device will be unable to communicate with the external device.

[0003] In the absence of an external power source, or if the external power supply is interrupted on-site, low-power IoT devices can output power. However, the output power is limited and cannot be supplied for extended periods. Conventional interfaces for low-power IoT devices are used to input external power, such as the 485 interface of low-power IoT devices, which typically require external power for communication. When communicating with devices without external power, low-power IoT devices need to provide power to the external device. However, the power provided by low-power IoT devices is typically short-lived and must be turned off after the power supply ends. Long-term power supply is prohibited to prevent battery depletion. Therefore, when outputting power, low-power IoT devices cannot power themselves through the external power interface to avoid being identified as a genuine external power source.

[0004] At present, no effective solution to the above problems has been found. Utility Model Content

[0005] The technical problem to be solved by the present invention is to address the above shortcomings and provide an input-output shared power supply circuit for low-power Internet of Things devices, which enables the low-power Internet of Things devices to use a single power supply circuit to perform external power input and internal power output processing. When there is external power input, the low-power Internet of Things device can perform external power input. When there is no external power or the external power is interrupted on site, the low-power Internet of Things device can perform short-term internal power output processing and output power to other external devices (such as low-power flow meters) to power them, thereby completing normal communication with external devices.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: A low-power IoT device input and output shared power supply circuit, including a power supply module, including:

[0007] External interface P1 is used to connect external power supply and communication module.

[0008] The switch circuit is turned on or off depending on whether an external power supply is connected.

[0009] The comparison circuit is connected to the external interface P1 and the voltage divider circuit, and controls the switching circuit to be turned on according to the voltage output by the voltage divider circuit.

[0010] The voltage divider circuit is used to output different voltages to the comparison circuit.

[0011] Furthermore, pin 1 of the external interface P1 is connected to the switch circuit, the voltage divider circuit, and the comparison circuit at the same time, and pin 2 of the external interface P1 is connected to the reference potential GND.

[0012] Furthermore, the switch circuit is a field effect transistor Q1.

[0013] Furthermore, the G pin of the field effect transistor Q1 is connected to the comparison circuit, the D pin of the field effect transistor Q1 is connected to the external interface P1, the voltage divider circuit and the comparison circuit, and the S pin of the field effect transistor Q1 is connected to the input port of the power module.

[0014] Furthermore, the comparison circuit includes a resistor R1 and a comparator U1.

[0015] Furthermore, pins 5, 6, and 8 of the comparator U1 are connected to the voltage divider circuit, pin 4 of the comparator U1 is connected to the reference potential GND, and pin 7 of the comparator U1 is simultaneously connected to one end of the resistor R1 and pin G of the field effect transistor Q1.

[0016] One end of the resistor R1 is also connected to the G pin of the field effect transistor Q1, and the other end of the resistor R1 is simultaneously connected to the external interface P1, the 5 pin of the comparator U1, the D pin of the field effect transistor Q1 and the voltage divider circuit.

[0017] Furthermore, the voltage divider circuit includes a diode D1 , a diode D2 , and a diode D3 .

[0018] Furthermore, pin 1 of the diode D1 is simultaneously connected to the external interface P1, pin 5 of the comparator U1, the other end of the resistor R1, and pin D of the field effect transistor Q1.

[0019] Pin 2 of diode D1 is connected to pin 6 of comparator U1 and pin 1 of diode D2 at the same time.

[0020] Pin 2 of diode D2 is connected to pin 2 of diode D3 and the output port of the power module at the same time.

[0021] Pin 1 of the diode D3 is connected to pin 8 of the comparator U1, and pin 2 of the diode D3 is also connected to the output port of the power module.

[0022] The utility model adopts the above technical solution and has the following advantages compared with the prior art:

[0023] 1. Through the design of this power circuit, when there is external power input, the low-power IoT device can input the external power. Current will pass through the input port of the power module of the power circuit of the low-power IoT device, and then provide the low-power IoT device with an external power input signal, completing the recognition of the external power signal input.

[0024] 2. This power circuit design allows the low-power IoT device to temporarily output its internal power when no external power is available or if the power is interrupted. This output power can be used to power other external devices (such as a low-power flow meter) without powering itself. After briefly powering an external device, the low-power IoT device can communicate normally with it. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attachment Figure 1 This is a circuit diagram of a low-power Internet of Things device with shared input and output power supply in an embodiment of the present utility model;

[0026] In the figure: P1-external interface, R1-resistor, U1-comparator, Q1-field effect transistor, D1, D2, D3-diodes, 11-power module. DETAILED DESCRIPTION

[0027] The following will provide a clearer understanding of the technical features, purposes and effects of the present invention. The specific implementation methods of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that the following does not constitute a limitation on the scope of protection of the present invention.

[0028] Examples, such as Figure 1 As shown, a low-power IoT device input and output shared power supply circuit includes a power supply module 11, including:

[0029] External interface P1 is used to connect external power supply and communication module.

[0030] The switch circuit is turned on or off depending on whether an external power supply is connected.

[0031] The comparison circuit is connected to the external interface P1 and the voltage divider circuit, and controls the switching circuit to be turned on according to the voltage output by the voltage divider circuit.

[0032] The voltage divider circuit is used to output different voltages to the comparison circuit.

[0033] Pin 1 of the external interface P1 is connected to the switch circuit, the voltage divider circuit, and the comparison circuit at the same time, and pin 2 of the external interface P1 is connected to the reference potential GND.

[0034] The switching circuit is a field effect transistor Q1.

[0035] The G pin of the field effect transistor Q1 is connected to the comparison circuit, the D pin of the field effect transistor Q1 is connected to the external interface P1, the voltage divider circuit and the comparison circuit, and the S pin of the field effect transistor Q1 is connected to the input port of the power module 11.

[0036] The comparison circuit includes a resistor R1 and a comparator U1.

[0037] Pins 5, 6, and 8 of the comparator U1 are connected to a voltage divider circuit, pin 4 of the comparator U1 is connected to a reference potential GND, and pin 7 of the comparator U1 is simultaneously connected to one end of the resistor R1 and pin G of the field effect transistor Q1.

[0038] One end of the resistor R1 is also connected to the G pin of the field effect transistor Q1, and the other end of the resistor R1 is simultaneously connected to the external interface P1, the 5 pin of the comparator U1, the D pin of the field effect transistor Q1 and the voltage divider circuit.

[0039] Comparator U1 is used to compare the voltage output by the voltage divider circuit with the reference potential GND. Based on the comparison result, the voltage at the G pin of field effect transistor Q1 is controlled, thereby controlling its conduction or cutoff.

[0040] The voltage divider circuit includes a diode D1 , a diode D2 , and a diode D3 .

[0041] Pin 1 of the diode D1 is connected to the external interface P1, pin 5 of the comparator U1, the other end of the resistor R1 and pin D of the field effect transistor Q1.

[0042] Pin 2 of diode D1 is connected to pin 6 of comparator U1 and pin 1 of diode D2 at the same time.

[0043] Pin 2 of the diode D2 is connected to pin 2 of the diode D3 and the output port of the power module 11 at the same time.

[0044] Pin 1 of the diode D3 is connected to pin 8 of the comparator U1 , and pin 2 of the diode D3 is also connected to the output port of the power module 11 .

[0045] The voltage divider circuit is used to divide the voltage of the external interface P1 and send it to different input terminals of the comparator U1.

[0046] The working principle of this circuit is as follows:

[0047] The external interface P1 of the low-power IoT device power circuit can output the power of the low-power IoT device, and can also input external power to the low-power IoT device.

[0048] When there is no external power supply connected to the external interface P1 of the low-power IoT device, the low-power IoT device can output power to the connected external device. The output port of the power module 11 of the low-power IoT device supplies power to pin 8 of the comparator U1 and the diode D2. The diode D2 is connected in series with the diode D1. The 2nd pin of the diode D1 is connected to the 1st pin of the external interface P1. The low-power IoT device outputs power to the external device. The voltage of the 2nd pin of the diode D1 is higher than the voltage of the 1st pin. The comparator U1 is connected in parallel with the diode D1. The 7th pin of the comparator U1 outputs a low level. At this time, the field effect transistor Q1 is cut off. No current flows through the input port of the power module 11. The input port is low and the power module 11 of the low-power IoT device is not powered. It can also be judged that the low-power IoT device has no external power supply connected.

[0049] When the external interface P1 of the low-power IoT device has an external power input, the external power supply supplies power to the low-power IoT device. At this time, the voltage of pin 1 of the diode D1 is higher than the voltage of pin 2, the pin 7 of the comparator U1 outputs a high level, and the field effect transistor Q1 is in the on state. At this time, current flows through the input port of the power module 11, and power is supplied to the power module 11 of the low-power IoT through the input port of the power module 11. This can also be used to determine that the low-power IoT device has an external power supply connected.

[0050] The design of this power supply circuit can solve the problem of low-power IoT devices completing internal power output to power external devices and complete communication when there is no external power input. In addition, when there is external power input, the low-power IoT device can judge that there is external power access based on the current passing through the input port of the power module, and complete the identification of the external power signal input. After the low-power IoT device is connected to the external power supply, the power energy is sufficient, high-frequency communication can be carried out, and the working state conversion is completed.

[0051] Low-power IoT devices utilize a single power supply circuit to achieve both external power input and internal power output. This allows the device to continue powering external devices and complete communication even if the external power supply fails.

[0052] The above description is merely an example of the preferred embodiment of the present invention. Any details not described in detail are common knowledge within the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. An input-output shared power supply circuit for a low-power Internet of Things device, comprising a power supply module (11), characterized in that: These include: External interface P1, used to connect external power supply and communication module; The switch circuit is turned on or off according to whether there is an external power supply; The comparison circuit is connected to the external interface P1 and the voltage divider circuit, and controls the switching circuit to be turned on according to the voltage output by the voltage divider circuit; The voltage divider circuit is used to output different voltages to the comparison circuit.

2. The input-output shared power supply circuit for low-power Internet of Things devices according to claim 1, characterized in that: Pin 1 of the external interface P1 is connected to the switch circuit, the voltage divider circuit, and the comparison circuit at the same time, and pin 2 of the external interface P1 is connected to the reference potential GND.

3. The input-output shared power supply circuit for low-power Internet of Things devices according to claim 1, characterized in that: The switching circuit is a field effect transistor Q1.

4. The input-output shared power supply circuit for low-power Internet of Things devices according to claim 1, characterized in that: The G pin of the field effect tube Q1 is connected to the comparison circuit, the D pin of the field effect tube Q1 is connected to the external interface P1, the voltage divider circuit and the comparison circuit, and the S pin of the field effect tube Q1 is connected to the input port of the power module (11).

5. The input-output shared power supply circuit for low-power Internet of Things devices according to claim 1, characterized in that: The comparison circuit includes a resistor R1 and a comparator U1.

6. The input-output shared power supply circuit for low-power Internet of Things devices according to claim 1, characterized in that: Pins 5, 6, and 8 of the comparator U1 are connected to a voltage divider circuit, pin 4 of the comparator U1 is connected to the reference potential GND, and pin 7 of the comparator U1 is connected to one end of the resistor R1 and pin G of the field effect transistor Q1. One end of the resistor R1 is also connected to the G pin of the field effect transistor Q1, and the other end of the resistor R1 is simultaneously connected to the external interface P1, the 5 pin of the comparator U1, the D pin of the field effect transistor Q1 and the voltage divider circuit.

7. The input-output shared power supply circuit for low-power Internet of Things devices according to claim 1, characterized in that: The voltage divider circuit includes a diode D1 , a diode D2 , and a diode D3 .

8. The input-output shared power supply circuit for low-power Internet of Things devices according to claim 1, characterized in that: Pin 1 of diode D1 is connected to external interface P1, pin 5 of comparator U1, the other end of resistor R1 and pin D of field effect transistor Q1; Pin 2 of diode D1 is connected to pin 6 of comparator U1 and pin 1 of diode D2 at the same time; Pin 2 of the diode D2 is connected to pin 2 of the diode D3 and the output port of the power module (11); Pin 1 of the diode D3 is connected to pin 8 of the comparator U1, and pin 2 of the diode D3 is also connected to the output port of the power module (11).

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