CN219016428U

CN219016428U - Low-power consumption product current self-monitoring circuit and low-power consumption product

Info

Publication number: CN219016428U
Application number: CN202222406424.0U
Authority: CN
Inventors: 郑径欧; 陈哲超
Original assignee: Hangzhou Xinchuang Zhilian Technology Co ltd
Current assignee: Hangzhou Xinchuang Zhilian Technology Co ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-05-12
Anticipated expiration: 2032-09-09

Abstract

The utility model relates to the field of current self-monitoring, in particular to a low-power consumption product current self-monitoring circuit which comprises: the grid of NMOS pipe links to each other and regard as first input with the one end of third resistance, the drain electrode of NMOS pipe links to each other with the low-power consumption product circuit ground terminal of external, NPN triode's base, the source electrode of NMOS pipe links to each other and links to each other with the ground terminal with NPN triode's projecting pole, NPN triode's collecting electrode links to each other with the one end of second resistance, the other end of second resistance links to each other and regard as the second output with the one end of first resistance, the other end of first resistance is regard as the third input, the other end of third resistance links to each other with the ground terminal, first input, second output and third input are used for linking to each other with the MCU of external low-power consumption product circuit. By adding the design into the low-power-consumption product circuit, the self-checking of the power consumption of the low-power-consumption product is performed, so that the circuit cost is low, the occupied area is small, and the cost increase is small.

Description

Low-power consumption product current self-monitoring circuit and low-power consumption product

Technical Field

The utility model relates to the field of current self-monitoring, in particular to a low-power-consumption product current self-monitoring circuit and a low-power-consumption product.

Background

For some existing low-power consumption products, the low-power consumption product is in a low-current working environment for a long time in the use process. However, many fire accidents occur because many low-power-consumption products are in a low-current working environment for a long time, and once the working current suddenly becomes high, the products are not monitored for current, so that the use of the products is affected, short circuits are possibly generated, fire is caused, and the life and property safety of people is greatly affected.

Therefore, a lot of low-power consumption products are noticed at present, and detection is started on the low-power consumption products, but the detection is generally carried out when leaving the factory, and few workers can regularly detect the low-power consumption products, so that labor cost is increased undoubtedly; or the use of chips in circuit designs incorporating power self-test, which can add virtually to the cost of production of low power products.

Disclosure of Invention

Aiming at the defects that the power consumption self-checking is performed by using a chip to increase the production cost of a low-power-consumption product and the like in the prior art, the utility model provides a low-power-consumption product current self-monitoring circuit and a low-power-consumption product.

The embodiment of the utility model provides a low-power consumption product current self-monitoring circuit, which comprises: NMOS tube, NPN triode, first resistor, second resistor, third resistor; the grid of NMOS pipe links to each other and regard as first input with the one end of third resistance, the drain electrode of NMOS pipe with external low-power consumption product circuit ground connection end the base of NPN triode links to each other, the source of NMOS pipe links to each other and links to each other with the ground connection end with the projecting pole of NPN triode, the collecting electrode of NPN triode links to each other with the one end of second resistance, the other end of second resistance links to each other and regard as the second output with the one end of first resistance, the other end of first resistance is regard as the third input, the other end of third resistance links to each other with the ground connection end, first input, second output and third input are used for linking to each other with the MCU of external low-power consumption product circuit.

Optionally, by adjusting the resistance values of the second resistor and the third resistor, when the current exceeds the threshold, the level of the second output end is greater than the threshold voltage of the internal comparator of the MCU.

Optionally, when the threshold voltage of the internal comparator of the MCU is 2V, the sum of the resistance values of the second resistor and the third resistor is 30 ohms.

The embodiment of the utility model also provides a low-power consumption product, which comprises: a low power consumption product circuit and a low power consumption product current self-monitoring circuit; the low-power consumption product circuit comprises an MCU, a power supply voltage input end and a low-power consumption product circuit grounding end; the low power consumption product current self-monitoring circuit includes: NMOS tube, NPN triode, first resistor, second resistor, third resistor; the grid of NMOS pipe links to each other and regard as first output with the one end of third resistance, the drain electrode of NMOS pipe with external low-power consumption product circuit ground terminal NPN triode's base links to each other, the source of NMOS pipe links to each other and links to each other with the ground terminal with NPN triode's projecting pole, NPN triode's collecting electrode links to each other with the one end of second resistance, the other end of second resistance links to each other and regard as the second output with the one end of first resistance, the other end of first resistance is regard as the third output, the other end of third resistance links to each other with the ground terminal, first output, second output and third output are used for linking to each other with the MCU of external low-power consumption product circuit.

Optionally, the MCU is a built-in MCU of the low power consumption product, the MCU has an internal comparator and an interrupter connected to the internal comparator, and when the internal comparator determines that the level of the second output end is higher than the threshold voltage of the internal comparator, the interrupter is controlled to send an alarm signal.

Optionally, the power supply voltage input end of the low-power-consumption product circuit is connected with the power supply positive electrode of the low-power-consumption product, and the grounding end is connected with the power supply negative electrode of the low-power-consumption product.

Optionally, the second output end is connected with an input end of an internal comparator of the MCU.

Optionally, the first input end is connected with an IO control end of the MCU.

Optionally, the third input end is connected with the IO output end of the MCU.

The utility model has the remarkable technical effects due to the adoption of the technical scheme:

the utility model provides a self-flowing self-monitoring circuit of a low-power-consumption product, which is applied to an NPN triode and an NMOS tube with low cost. The utility model adds the design into the low-power-consumption product circuit to carry out self-detection on the power consumption of the product, and the method has the advantages of low circuit cost, small occupied area and no cost increase for the low-cost product.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings required for the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only one embodiment of the present utility model, and all other embodiments obtained without the inventive effort by a person skilled in the art are within the scope of protection of the present utility model.

FIG. 1 is a schematic diagram of a circuit structure of a self-flowing self-monitoring circuit for a low-power product according to an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of a low power consumption product according to an embodiment of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the following examples, which are illustrative of the present utility model and are not intended to limit the present utility model thereto. The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to fig. 1 and fig. 2 in the embodiments of the present utility model.

Examples:

referring to fig. 1 and 2, fig. 1 is a schematic circuit structure diagram of a self-flowing self-monitoring circuit of the low-power-consumption product according to the embodiment of the utility model, and fig. 2 is a schematic circuit structure diagram of the low-power-consumption product according to the embodiment of the utility model.

The low power consumption product comprises: a low-power consumption product circuit H1 and a low-power consumption product current self-monitoring circuit H2; the low-power-consumption product circuit H1 comprises an MCU U1, a power supply voltage input end VCC and a low-power-consumption product circuit grounding end BGND; the low-power consumption product current self-monitoring circuit H2 comprises: NMOS tube Q2, NPN triode Q1, first resistor R1, second resistor R2, third resistor R3; the grid of NMOS pipe Q2 links to each other and regard as first input IO1 with one end of third resistance R3, NMOS pipe Q2's drain electrode with low-power consumption product circuit ground connection BGND the base of NPN triode Q1 links to each other, NMOS pipe Q2's source links to each other and links to each other with NPN triode Q1's projecting pole and links to each other with ground connection GND, NPN triode Q1's collecting electrode links to each other with one end of second resistance R2, second resistance R2's the other end links to each other and regard as second output IO2 with one end of first resistance R1, first resistance R1's the other end is as third input IO3, third resistance R3's the other end links to each other with ground connection GND, first input IO1, second output IO2 and third input IO3 are used for linking to each other with low-power consumption product circuit H1's MCU 1.

In this embodiment, the MCU is a built-in MCU of the low power consumption product, and the MCU has an internal comparator and an interrupter connected to the internal comparator, and when the internal comparator determines that the level of the second output end is higher than the threshold voltage of the internal comparator, the interrupter is controlled to send an alarm signal.

Specifically, MCU can choose to report to the police to thing networking product high in the clouds, and manual intervention stops work or maintains. In other embodiments, the low power product may also be directly controlled by an interrupter to stop operation or to stop part of the functions.

In this embodiment, the power supply voltage input end of the low-power-consumption product circuit is connected with the power supply anode of the low-power-consumption product, the ground end is connected with the power supply cathode of the low-power-consumption product, the second output end is connected with the input end of the internal comparator of the MCU, the first input end is connected with the IO control end of the MCU, and the third input end is connected with the IO output end of the MCU.

In this embodiment, by adjusting the resistances of the second resistor and the third resistor, when the current exceeds the threshold, the level of the second output end is greater than the threshold voltage of the internal comparator of the MCU.

Specifically, when the threshold voltage of the internal comparator of the MCU is 2V, the sum of the resistance values of the second resistor and the third resistor is 30 ohms. In other embodiments, the sum of the resistance values of the second resistor and the third resistor may be slightly greater than or slightly less than 30 ohms.

When the whole system is electrified, the base electrode voltage of the NPN triode is larger than the emitter voltage by 0.7V, so that the NPN triode is conducted, the base electrode voltage of the NPN triode is the power supply voltage, and the BGND voltage drop is 0.7V.

When the first input end IO1 of the MCU is set in a high-level output mode, the NMOS tube Q2 is conducted, and BGND is almost equal to GND level, because the low-power-consumption product current self-monitoring circuit is arranged between the original low-power-consumption product circuit and the grounding end, and the low-power-consumption product current self-monitoring circuit does not influence the normal operation of the low-power-consumption product circuit in normal operation.

When the low-power consumption product circuit needs to detect current, the MCU is utilized to set the first input end IO1 as floating input, and the NMOS tube is turned on and off. The second resistor is connected with the third resistor and is commonly connected with the MCU at a second output end IO 2. The second output end IO2 is set to be a pull-up input, the potential is pulled up, the third resistor is clamped in a high level state, the third resistor also plays a role in limiting current, and current flows in from the base electrode of the NPN triode and amplifies the current flowing through the base electrode.

Therefore, by setting the second resistor and the third resistor, the saturation current of the NPN triode is 100mA, and when the level of the second output end IO2 is greater than the threshold voltage of the internal comparator, an alarm signal is sent by using the interrupter, and the overhaul is manually intervened.

In addition, the specific embodiments described in the present specification may differ in the shape, the name, and the like of the components. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the utility model as defined in the accompanying claims.

Claims

1. A low power consumption product current self-monitoring circuit, comprising: NMOS tube, NPN triode, first resistor, second resistor, third resistor; the grid of NMOS pipe links to each other and regard as first input with the one end of third resistance, the drain electrode of NMOS pipe with external low-power consumption product circuit ground connection end the base of NPN triode links to each other, the source of NMOS pipe links to each other and links to each other with the ground connection end with the projecting pole of NPN triode, the collecting electrode of NPN triode links to each other with the one end of second resistance, the other end of second resistance links to each other and regard as the second output with the one end of first resistance, the other end of first resistance is regard as the third input, the other end of third resistance links to each other with the ground connection end, first input, second output and third input are used for linking to each other with the MCU of external low-power consumption product circuit.

2. The low power consumption product current self-monitoring circuit according to claim 1, wherein the level of the second output terminal is greater than the threshold voltage of the internal comparator of the MCU by adjusting the resistance values of the second resistor and the third resistor so that the current exceeds the threshold.

3. The low power consumption product current self-monitoring circuit according to claim 1, wherein when the threshold voltage of the internal comparator of the MCU is 2V, the sum of the resistance values of the second resistor and the third resistor is 30 ohms.

4. A low power consumption product comprising: a low power consumption product circuit and a low power consumption product current self-monitoring circuit; the low-power consumption product circuit comprises an MCU, a power supply voltage input end and a low-power consumption product circuit grounding end; the low power consumption product current self-monitoring circuit includes: NMOS tube, NPN triode, first resistor, second resistor, third resistor; the grid of NMOS pipe links to each other and regard as first input with the one end of third resistance, the drain electrode of NMOS pipe with low-power consumption product circuit ground terminal the base of NPN triode links to each other, the source of NMOS pipe links to each other and links to each other with the ground terminal with the projecting pole of NPN triode, the collecting electrode of NPN triode links to each other with the one end of second resistance, the other end of second resistance links to each other and regard as the second output with the one end of first resistance, the other end of first resistance is regard as the third input, the other end of third resistance links to each other with the ground terminal, first input, second output and third input are used for linking to each other with the MCU of low-power consumption product circuit.

5. The low power consumption product according to claim 4, wherein the MCU is a built-in MCU of the low power consumption product, the MCU has an internal comparator and an interrupter connected to the internal comparator, and when the internal comparator determines that the level of the second output terminal is higher than the threshold voltage of the internal comparator, the interrupter is controlled to issue an alarm signal.

6. The low power consumption product according to claim 4, wherein the power supply voltage input terminal of the low power consumption product circuit is connected to the positive power supply terminal of the low power consumption product, and the ground terminal is connected to the negative power supply terminal of the low power consumption product.

7. The low power product of claim 4, wherein the second output is connected to an input of an internal comparator of the MCU.

8. The low power consumption product of claim 4, wherein the first input is connected to the IO control terminal of the MCU.

9. The low power product of claim 4, wherein the third input is connected to the IO output of the MCU.