WO2024026636A1 - Liquid leakage detection method for airflow sensor circuit, airflow sensor circuit, airflow sensor, and electronic product - Google Patents

Abstract

The present invention relates to a liquid leakage detection method for an airflow sensor circuit, an airflow sensor circuit, an airflow sensor, and an electronic product. The liquid leakage detection method for an airflow sensor circuit comprises the steps of: by means of a liquid leakage detection pin provided on an airflow sensor circuit package, measuring the equivalent resistance and/or equivalent voltage of an environment where an airflow sensor circuit is located; by means of a measurement circuit provided in the airflow sensor circuit package, determining whether the equivalent resistance and/or the equivalent voltage exceeds a corresponding preset value; and if the equivalent resistance and/or the equivalent voltage exceeds the preset value, outputting an airflow sensor circuit disabling signal. By means of the present invention, the measurement circuit can be ensured to work normally when a liquid leakage accident occurs in the environment where the airflow sensor circuit package is located, so that a change of the equivalent resistance and/or the equivalent voltage of the environment can be detected, and it can be ensured that the airflow sensor circuit is controlled to stop working according to the change of the equivalent resistance and/or the equivalent voltage, thereby preventing safety accidents caused by the fact that electronic products are still electrified during liquid leakage, and reducing potential safety hazards of electronic products.

Description

Microphone circuit oil leakage detection method, microphone circuit, microphone and electronic products Technical field

The present invention relates to the technical field of microphones, and more specifically, to an oil leakage detection method of a microphone circuit, a microphone circuit, a microphone and electronic products.

Background technique

The microphone is one of the core components of electronic products such as e-cigarettes. The overall working principle of an electronic cigarette using a microphone switch can be summarized as follows: the user inhales - the airflow sensor (microphone) responds - the control circuit is triggered - the atomizer starts working - steam is generated. When you stop inhaling, the airflow in the sensor disappears, the airflow sensing switch is turned off, the control module of the control circuit stops working, and the atomizer stops working. Compared with button switches, microphone switches make electronic cigarettes more intelligent and easier to operate, making them more suitable for pod cigarettes with lower power.

However, when the e-cigarette leaks oil, the oil droplets will enter the inside of the microphone, causing the e-cigarette to accidentally trigger, thus causing unnecessary safety accidents.

There is currently no good solution to this industry-wide problem.

Contents of the invention

The technical problem to be solved by the present invention is to provide an oil leakage detection method for a microphone circuit in view of the above-mentioned defects of the prior art. It also provides a microphone circuit, a microphone and electronic products.

The oil leakage detection method of the microphone circuit of the present invention includes the steps:

Through the oil leakage detection pin provided on the microphone circuit package, the equivalent resistance and/or equivalent voltage of the environment in which the microphone circuit is located is detected;

Determine whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value through a detection circuit provided in the microphone circuit package;

When the equivalent resistance and/or equivalent voltage exceed the preset value, a signal to stop working of the microphone circuit is output.

The oil leakage detection method of the present invention, wherein the step is to detect the equivalent resistance and/or equivalent resistance of the environment where the microphone circuit is located through the oil leakage detection pin provided on the microphone circuit package. Effective voltage, specifically including:

Set an oil leakage detection pin on the microphone circuit package;

Applying intermittent or continuous electrical signals to the oil leakage detection pin;

Through the detection circuit provided in the microphone circuit package, the electrical signal fed back by the oil leakage detection pin is read to obtain the equivalent resistance and/or equivalent voltage of the environment in which the microphone circuit package is located.

The oil leakage detection method of the present invention, wherein the step: reading the electrical signal fed back by the oil leakage detection pin, specifically includes:

Read the electrical signal between the oil leakage detection pin and ground; and/or,

Read the electrical signal between the oil leakage detection pin and the power supply.

The oil leakage detection method of the present invention, wherein the step: determine whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value, specifically includes:

A voltage detection comparator or current comparator is used to determine whether the equivalent resistance or equivalent voltage exceeds the corresponding preset value.

A microphone circuit of the present invention, which includes: an oil leakage detection unit circuit; the oil leakage detection unit circuit includes:

The oil leakage detection pin provided on the microphone circuit package is used to detect the equivalent resistance and/or equivalent voltage of the environment in which the microphone circuit package is located;

A detection circuit provided in the microphone circuit package is electrically connected to the oil leakage detection pin, and is used to determine whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value, and when the When the equivalent resistance and/or equivalent voltage exceed the preset value, the microphone circuit stops working signal.

In the microphone circuit of the present invention, an intermittent or continuous electrical signal is applied to the oil leakage detection pin.

In the microphone circuit of the present invention, the detection circuit is a voltage detection comparator or a current comparator.

In the microphone circuit of the present invention, the oil leakage detection pin is multiplexed with the charging pin of the microphone circuit.

A microphone of the present invention, wherein the microphone is provided with a microphone circuit as described in any one of the preceding items.

An electronic product of the present invention, wherein the electronic product is provided with a microphone as described in any one of the preceding items.

The beneficial effect of the present invention is that by arranging the oil leakage detection pin on the package of the microphone circuit, and at the same time arranging the detection circuit in the package of the microphone circuit, it can ensure that an oil leakage accident occurs in the environment where the microphone circuit package is located. , the detection circuit can work normally, so that it can not only detect changes in the equivalent resistance and/or equivalent voltage of the environment, but also ensure that the microphone circuit is controlled to stop working based on the changes in equivalent resistance and/or equivalent voltage, preventing electronic If the product is still powered on despite oil leakage, it may cause safety accidents and reduce the safety hazards of electronic products.

Description of the drawings

In order to more clearly illustrate the embodiments of the present invention or technical solutions in the prior art, the present invention will be further described below with reference to the drawings and examples. The drawings in the following description are only some embodiments of the present invention. For those in the field Ordinary technicians can also obtain other drawings based on these drawings without exerting creative work:

Figure 1 is a flow chart of the oil leakage detection method of the microphone circuit according to the preferred embodiment of the present invention;

Figure 2a is a schematic diagram of the microphone circuit according to the preferred embodiment of the present invention;

Figure 2b is the second schematic diagram of the microphone circuit according to the preferred embodiment of the present invention;

Figure 3 is a circuit diagram of an oil leakage detection voltage detection comparator solution according to another preferred embodiment of the present invention;

Figure 4 is a circuit diagram of the oil leakage detection voltage detection comparator scheme 2 of another preferred embodiment of the present invention;

Figure 5 is a circuit diagram of a voltage detection ADC solution in an oil leakage detection circuit according to another preferred embodiment of the present invention;

Figure 6 is a circuit diagram of the second scheme of the voltage detection ADC in the oil leakage detection circuit of another preferred embodiment of the present invention;

Figure 7 is a circuit diagram of a current detection ADC scheme in an oil leakage detection circuit according to another preferred embodiment of the present invention;

Figure 8 is a circuit diagram of the second scheme of the current detection ADC in the oil leakage detection circuit of another preferred embodiment of the present invention;

Figure 9 is a circuit diagram of the ADC scheme when there is oil leakage in both VDD and CHG in the oil leakage detection circuit in the preferred embodiment of the present invention;

Figure 10 is a circuit diagram of the comparator scheme when there is oil leakage in both VDD and CHG in the oil leakage detection circuit in the preferred embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only partial embodiments of the present invention, and Not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the protection scope of the present invention.

In an embodiment of the present invention, an oil leakage detection method for a microphone circuit is provided, as shown in Figure 1, including the steps:

Step S10: Detect the equivalent resistance and/or equivalent voltage of the environment where the microphone circuit is located through the oil leakage detection pin provided on the microphone circuit package;

Step S20: Determine whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value through the detection circuit provided in the microphone circuit package;

Step S30: When the equivalent resistance and/or equivalent voltage exceed the preset value, output a signal that the microphone circuit stops working.

When there is no oil leakage outside the microphone circuit package, the oil leakage detection pin is equivalent to grounding, and the voltage is 0V; when oil leakage occurs outside the microphone circuit package, the oil leakage detection pin is equivalent to an external "load" ”, the equivalent resistance value of the “load” varies depending on the specific oil droplet leakage, the voltage value on the oil leakage detection pin will change, and the voltage comparator will output this change through the output terminal to The suction detection unit circuit or other circuits of the microphone circuit control the microphone circuit to stop working, thereby avoiding various dangerous accidents caused by oil leakage.

By arranging the oil leakage detection pin on the package of the microphone circuit and at the same time arranging the detection circuit in the package of the microphone circuit, the present invention can ensure that when an oil leakage accident occurs in the environment where the microphone circuit package is located, the detection circuit can Normal operation, so that it can not only detect changes in the equivalent resistance and/or equivalent voltage of the environment, but also ensure that the microphone circuit is controlled to stop working based on the changes in equivalent resistance and/or equivalent voltage to prevent electronic products from oil leakage. It may cause safety accidents if the power is still on, reducing the safety hazards of electronic products.

In a further embodiment of the present invention, the steps in the oil leakage detection method are: detecting the equivalent resistance and/or equivalent voltage of the environment where the microphone circuit is located through the oil leakage detection pin provided on the microphone circuit package, Specifically include:

Set the oil leakage detection pin on the microphone circuit package;

Apply intermittent or continuous electrical signals to the oil leakage detection pin;

Through the detection circuit provided in the microphone circuit package, the electrical signal fed back by the oil leakage detection pin is read to obtain the equivalent resistance and/or equivalent voltage of the environment where the microphone circuit package is located.

In a further embodiment of the present invention, the step in the oil leakage detection method: reading the electrical signal fed back by the oil leakage detection pin specifically includes:

Read the electrical signal between the oil leak detection pin and ground; and/or,

Read the electrical signal between the oil leak detection pin and the power supply.

In a further embodiment of the present invention, the step in the oil leakage detection method: determining whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value specifically includes:

A voltage detection comparator or current comparator is used to determine whether the equivalent resistance or equivalent voltage exceeds the corresponding preset value. Among them, the preset value can be set to the possible equivalent resistance value range of the oil drop: 1KΩ~1MΩ, 1KΩ~200KΩ, 50KΩ~200KΩ..., or the preset value can be set to be calculated based on the equivalent resistance value range. range of equivalent voltage values. The default value may vary due to different microphone circuit solutions and the environment, but it should be considered to be within the protection scope of the present invention.

In a further embodiment of the present invention, a microphone circuit is provided, which includes: an oil leakage detection unit circuit, using the aforementioned oil leakage detection method.

As shown in Figure 2a and 2b, the oil leakage detection unit circuit includes:

The oil leakage detection pin provided on the microphone circuit package is used to detect the equivalent resistance and/or equivalent voltage of the environment where the microphone circuit package is located;

A detection circuit provided in the microphone circuit package is electrically connected to the oil leakage detection pin, and is used to determine whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value, and determines whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value. When the equivalent voltage exceeds the preset value, the microphone circuit stops working signal.

The microphone circuit of the present invention can ensure that oil leakage accidents occur in the environment where the microphone circuit package is located by arranging the oil leakage detection pin on the package of the microphone circuit and at the same time arranging the detection circuit in the package of the microphone circuit. , the detection circuit can work normally, so that it can not only detect changes in the equivalent resistance and/or equivalent voltage of the environment, but also ensure that the microphone circuit is controlled to stop working based on the changes in equivalent resistance and/or equivalent voltage, preventing electronic The product is still powered on despite oil leakage, causing safety accidents and reducing the safety hazards of electronic products.

Further, in the above microphone circuit, an intermittent or continuous electrical signal, such as a pulse signal, is applied to the oil leakage detection pin.

Further, in the above-mentioned microphone circuit, as shown in Figure 2b, the oil leakage detection pin is multiplexed with the charging pin of the microphone circuit. In this way, the internal detection circuit can be directly added to the original six-pin package of the microphone circuit to achieve the purpose of oil leakage detection. It can avoid the adverse consequences of increasing the microphone circuit package size and cost due to the increase in pins.

Further, the detection circuit in the microphone circuit is a voltage detection comparator or a current comparator, or other circuits with the same function, as shown in Figure 3-10.

Embodiment 1

As shown in Figures 3 and 4, and referring to Figures 2a and 2b at the same time, the detection circuit in the microphone circuit is a voltage detection comparator circuit, which includes: the input oil leakage detection pin OLD and the output terminal OUTPU. The oil leakage detection pin OLD is set on the package of the microphone circuit and is multiplexed with the charging pin CHG of the microphone circuit. It can detect whether there is oil leakage outside the package of the microphone circuit; the voltage comparator and its output end are set on the microphone circuit. Inside the package of the head circuit to ensure that it can work normally even in an oil leakage state.

When the microphone circuit is working normally, an electrical signal is applied to the oil leakage detection pin OLD and the voltage value of this pin is read at the same time. The other input terminal of the voltage comparator is connected to the reference voltage REF, and the result is output after comparison by the voltage comparator. When there is no oil leakage outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to grounding, and the voltage is 0V; when oil leakage occurs outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to an external connection. "Load", the size of the equivalent resistance value RX of the "load" is different due to the specific leakage of oil droplets. The voltage value on the oil leakage detection pin OLD will change, and the voltage comparator will pass this change through The output terminal OUTPUT is output to the suction detection unit circuit or other circuits of the microphone circuit to control the microphone circuit to stop working, thereby avoiding various dangerous accidents caused by oil leakage.

In this process, since the voltage comparator circuit is arranged inside the package of the microphone circuit, even if an oil leakage accident occurs in the environment in which it is located, the internal circuit can still work normally. Therefore, compared with various methods in the prior art, This method of oil leakage detection or prevention is more reliable. Therefore, the safety of the microphone circuit is greatly improved, thereby further improving the safety of electronic products using the microphone circuit. Therefore, the detection method of this embodiment is The effects that oil leakage detection methods and circuits can bring are very significant.

Moreover, since the oil leakage detection pin OLD in this embodiment is multiplexed with the charging pin CHG of the microphone circuit, there is no need to add additional pins. The microphone circuit can continue to use the six-pin package structure, avoiding the need for packaging due to package size. The cost of the microphone circuit increases due to the increase, so the oil leakage detection method and circuit of this embodiment have great practicability.

Embodiment 2

As shown in Figure 5 and Figure 6, refer to Figure 2a and Figure 2b at the same time, the detection circuit in the microphone circuit is a voltage detection ADC circuit, which includes: the input terminal oil leakage detection pin OLD and the output terminal OUTPUT. The oil leakage detection pin OLD is set on the package of the microphone circuit and is multiplexed with the charging pin CHG of the microphone circuit. It can detect whether there is oil leakage outside the package of the microphone circuit; the voltage detection ADC circuit and its output end are set on The inside of the microphone circuit is packaged to ensure that it can work normally even in the event of oil leakage.

When the microphone circuit is working normally, an electrical signal is applied to the oil leakage detection pin OLD, and the voltage value of this pin is read at the same time. The result is output after comparison by the voltage detection ADC circuit. When there is no oil leakage outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to grounding, and the voltage is 0V; when oil leakage occurs outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to an external connection. "Load", the size of the equivalent resistance value RX of the "load" varies depending on the specific oil droplet leakage. The voltage value on the oil leakage detection pin OLD will change, and the voltage detection ADC circuit will change this change. The output terminal OUTPUT is output to the suction detection unit circuit or other circuits of the microphone circuit to control the microphone circuit to stop working, thereby avoiding various dangerous accidents caused by oil leakage.

In this process, since the voltage detection ADC circuit is set inside the package of the microphone circuit, even if an oil leakage occurs in the environment where it is located, the internal circuit can still work normally. Therefore, compared with various oil leakage detection or prevention methods in the prior art, the detection method of this embodiment is more reliable, greatly improving the safety of the microphone circuit, thereby further improving the electronics using the microphone circuit. Product safety. Therefore, the effect brought by the oil leakage detection method and circuit of this embodiment is very significant.

Moreover, since the oil leakage detection pin OLD in this embodiment is multiplexed with the charging pin CHG of the microphone circuit, there is no need to add additional pins. The microphone circuit can continue to use the six-pin package structure, avoiding the need for packaging due to package size. The cost of the microphone circuit increases due to the increase, so the oil leakage detection method and circuit of this embodiment have great practicability.

Embodiment 3

As shown in Figure 7, referring to Figure 2a and Figure 2b at the same time, the detection circuit in the microphone circuit is a current detection ADC circuit, which includes: the first input terminal oil leakage detection pin OLD, the second input terminal connected to the power supply VDD, The output terminal OUTPUT and the fixed resistor R1 set between the two input terminals. The oil leakage detection pin OLD is set on the package of the microphone circuit and is multiplexed with the charging pin CHG of the microphone circuit. It can detect whether there is oil leakage outside the package of the microphone circuit; the current detection ADC circuit and its output end are set on The inside of the microphone circuit is packaged to ensure that it can work normally even in the event of oil leakage.

When the microphone circuit is working normally, an electrical signal is applied to the oil leakage detection pin OLD, and the current value of this pin is read at the same time. After processing by the current detection ADC circuit, the result is output. When there is no oil leakage outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to grounding, and the current is 0; when oil leakage occurs outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to an external connection. "Load", the size of the equivalent resistance value RX of the "load" is different due to the specific leakage of oil droplets. The current value on the oil leakage detection pin OLD will change, and the current detection ADC circuit will change this change. The output terminal OUTPUT is output to the suction detection unit circuit or other circuits of the microphone circuit to control the microphone circuit to stop working, thereby avoiding various dangerous accidents caused by oil leakage.

In this process, since the current detection ADC circuit is set inside the package of the microphone circuit, even if an oil leakage occurs in the environment where it is located, the internal circuit can still work normally. Therefore, compared with various oil leakage detection or prevention methods in the prior art, the detection method of this embodiment is more reliable, greatly improving the safety of the microphone circuit, thereby further improving the electronics using the microphone circuit. Product safety. Therefore, the effect brought by the oil leakage detection method and circuit of this embodiment is very significant.

Moreover, since the oil leakage detection pin OLD in this embodiment is multiplexed with the charging pin CHG of the microphone circuit, there is no need to add additional pins. The microphone circuit can continue to use the six-pin package structure, avoiding the need for packaging due to package size. The cost of the microphone circuit increases due to the increase, so the oil leakage detection method and circuit of this embodiment have great practicability.

Embodiment 4

As shown in Figure 8, referring to Figure 2a and Figure 2b at the same time, the detection circuit in the microphone circuit is a current comparator circuit, which includes: the first input terminal oil leakage detection pin OLD, and the second input terminal connected to the microphone circuit power supply VDD , the output terminal OUTPUT, and the fixed resistor R1 set between the two input terminals. The oil leakage detection pin OLD is set on the package of the microphone circuit and is multiplexed with the charging pin CHG of the microphone circuit. It can detect whether there is oil leakage outside the package of the microphone circuit; the current comparator circuit and its output end are set on The inside of the microphone circuit is packaged to ensure that it can work normally even in the event of oil leakage.

When the microphone circuit is working normally, an electrical signal is applied to the oil leakage detection pin OLD, and the current value of this pin is read at the same time. After processing by the current comparator circuit, the result is output. When there is no oil leakage outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to grounding, and the current is 0; when oil leakage occurs outside the microphone circuit package, the oil leakage detection pin OLD is equivalent to an external connection. "Load", the size of the equivalent resistance value RX of the "load" is different due to the specific leakage of oil droplets. The current value on the oil leakage detection pin OLD will change, and the current comparator circuit will change this change. The output terminal OUTPUT is output to the suction detection unit circuit or other circuits of the microphone circuit to control the microphone circuit to stop working, thereby avoiding various dangerous accidents caused by oil leakage.

In this process, since the current comparator circuit is set inside the package of the microphone circuit, even if an oil leakage occurs in the environment where it is located, the internal circuit can still work normally. Therefore, compared with various oil leakage detection or prevention methods in the prior art, the detection method of this embodiment is more reliable, greatly improving the safety of the microphone circuit, thereby further improving the electronics using the microphone circuit. Product safety. Therefore, the effect brought by the oil leakage detection method and circuit of this embodiment is very significant.

Moreover, since the oil leakage detection pin OLD in this embodiment is multiplexed with the charging pin CHG of the microphone circuit, there is no need to add additional pins. The microphone circuit can continue to use the six-pin package structure, avoiding the need for packaging due to package size. The cost of the microphone circuit increases due to the increase, so the oil leakage detection method and circuit of this embodiment have great practicability.

Embodiment 5

As shown in Figure 9, referring to Figure 2a and Figure 2b at the same time, the detection circuit in the microphone circuit is a current detection ADC circuit, which includes: the first input terminal oil leakage detection pin OLD, the second input terminal connected to the power supply VDD, Output terminal OUTPUT. The oil leakage detection pin OLD is set on the package of the microphone circuit and is multiplexed with the charging pin CHG of the microphone circuit. It can detect whether there is oil leakage outside the package of the microphone circuit; the current detection ADC circuit and its output end are set on The inside of the microphone circuit is packaged to ensure that it can work normally even in the event of oil leakage.

When the microphone circuit is operating normally, an electrical signal is applied to the oil leakage detection pin OLD of the first input terminal and the current value of this pin is read at the same time; a detection electrical signal is applied to the second input terminal and the current value of this pin is read at the same time. pin current value. After the two input signals are processed by the current detection ADC circuit, the result is output.

When there is no oil leakage outside the microphone circuit package, the oil leakage detection pin OLD is equal to ground and the current is 0. When oil leakage occurs outside the microphone circuit package, and when there is oil leakage in both VDD and CHG of the microphone circuit, the oil leakage detection pin OLD at the first input terminal is equivalent to an external "load", and the second input terminal The terminal power supply VDD pin is also equivalent to an external "load". The equivalent resistance values RX1 and RX2 of these two "loads" vary depending on the specific oil droplets leaking, and the current values on the two input terminals will change, the current detection ADC circuit outputs this change to the suction detection unit circuit or other circuits of the microphone circuit through the output terminal OUTPUT, and controls the microphone circuit to stop working, thereby avoiding various dangerous accidents caused by oil leakage.

In this process, since the current detection ADC circuit is set inside the package of the microphone circuit, even if an oil leakage occurs in the environment where it is located, the internal circuit can still work normally. Therefore, compared with various oil leakage detection or prevention methods in the prior art, the detection method of this embodiment is more reliable, greatly improving the safety of the microphone circuit, thereby further improving the electronics using the microphone circuit. Product safety. Therefore, the effect brought by the oil leakage detection method and circuit of this embodiment is very significant.

Moreover, since the oil leakage detection pin OLD in this embodiment is multiplexed with the charging pin CHG of the microphone circuit, there is no need to add additional pins. The microphone circuit can continue to use the six-pin package structure, avoiding the need for packaging due to package size. The cost of the microphone circuit increases due to the increase, so the oil leakage detection method and circuit of this embodiment have great practicability.

Embodiment 6

As shown in Figure 10, referring to Figure 2a and Figure 2b at the same time, the detection circuit in the microphone circuit is a voltage comparator, which includes: the first input terminal oil leakage detection pin OLD, the second input terminal connected to the power supply VDD, and the output terminal OUTPUT. The oil leakage detection pin OLD is set on the package of the microphone circuit and is multiplexed with the charging pin CHG of the microphone circuit. It can detect whether there is oil leakage outside the package of the microphone circuit; the voltage comparator and its output end are set on the microphone circuit. Inside the package of the head circuit to ensure that it can work normally even in an oil leakage state.

When the microphone circuit is working normally, an electrical signal is applied to the oil leakage detection pin OLD of the first input terminal and the voltage value of this pin is read at the same time; a detection electrical signal is applied to the second input terminal and the voltage value of this pin is read at the same time. pin voltage value. After the two input signals are processed by the voltage comparator, the result is output.

When there is no oil leakage outside the microphone circuit package, the oil leakage detection pin OLD is equal to ground and the voltage is 0. When oil leakage occurs outside the microphone circuit package, and when there is oil leakage in both VDD and CHG of the microphone circuit, the oil leakage detection pin OLD at the first input terminal is equivalent to an external "load", and the second input terminal The VDD pin of the terminal power supply is also equivalent to an external "load". The equivalent resistance values RX1 and RX2 of these two "loads" vary depending on the specific oil droplets leaking, and the voltage values on the two input terminals will change, the voltage comparator outputs this change to the suction detection unit circuit or other circuits of the microphone circuit through the output terminal OUTPUT, and controls the microphone circuit to stop working, thereby avoiding various dangerous accidents caused by oil leakage.

In this process, since the voltage comparator circuit is set inside the package of the microphone circuit, even if an oil leakage occurs in the environment where it is located, the internal circuit can still work normally. Therefore, compared with various oil leakage detection or prevention methods in the prior art, the detection method of this embodiment is more reliable, greatly improving the safety of the microphone circuit, thereby further improving the electronics using the microphone circuit. Product safety. Therefore, the effect brought by the oil leakage detection method and circuit of this embodiment is very significant.

Moreover, since the oil leakage detection pin OLD in this embodiment is multiplexed with the charging pin CHG of the microphone circuit, there is no need to add additional pins. The microphone circuit can continue to use the six-pin package structure, avoiding the need for packaging due to package size. The cost of the microphone circuit increases due to the increase, so the oil leakage detection method and circuit of this embodiment have great practicability.

In a further embodiment of the present invention, a microphone is provided, the microphone is provided with the microphone circuit as described in any of the previous embodiments, or a microphone circuit product including the above-mentioned microphone circuit.

In a further embodiment of the present invention, an electronic product is provided, wherein the electronic product is provided with a microphone as described in any of the preceding embodiments. Moreover, the electronic product is not limited to electronic cigarettes, but can also be other electronic products using microphones.

To sum up, the present invention can ensure that oil leakage accidents occur in the environment where the microphone circuit package is located by arranging the oil leakage detection pin on the package of the microphone circuit and at the same time arranging the detection circuit in the package of the microphone circuit. , the detection circuit can work normally, so that it can not only detect changes in the equivalent resistance and/or equivalent voltage of the environment, but also ensure that the microphone circuit is controlled to stop working based on the changes in equivalent resistance and/or equivalent voltage, preventing electronic If the product is still powered on despite oil leakage, it may cause safety accidents and reduce the safety hazards of electronic products.

Compared with various oil leakage detection methods in the prior art, the detection method of the present invention is more reliable, greatly improving the safety of the microphone circuit, thereby further improving the safety of electronic products using the microphone circuit.

Moreover, since the oil leakage detection pin OLD in the present invention can be reused with the charging pin CHG of the microphone circuit, there is no need to add additional pins, so that the microphone circuit can continue to use the six-pin packaging structure, avoiding the need for packaging due to The cost of the microphone circuit increases due to the increase in size. Therefore, the oil leakage detection method and circuit of the present invention have great practicability and are easy to be popularized and used.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims (10)

An oil leakage detection method for a microphone circuit, which is characterized by including the steps: Detect the equivalent resistance and/or equivalent voltage of the environment in which the microphone circuit is located through the oil leakage detection pin provided on the microphone circuit package; Determine whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value through a detection circuit provided in the microphone circuit package; When the equivalent resistance and/or equivalent voltage exceed the preset value, a signal to stop working of the microphone circuit is output. The oil leakage detection method according to claim 1, characterized in that the step is to detect the equivalent resistance of the environment in which the microphone circuit is located through an oil leakage detection pin provided on the microphone circuit package. and/or equivalent voltage, including: Set an oil leakage detection pin on the microphone circuit package; Applying intermittent or continuous electrical signals to the oil leakage detection pin; Through the detection circuit provided in the microphone circuit package, the electrical signal fed back by the oil leakage detection pin is read to obtain the equivalent resistance and/or equivalent voltage of the environment in which the microphone circuit package is located. The oil leakage detection method according to claim 2, characterized in that the step: reading the electrical signal fed back by the oil leakage detection pin specifically includes: Read the electrical signal between the oil leakage detection pin and ground; and/or, Read the electrical signal between the oil leakage detection pin and the power supply. The oil leakage detection method according to claim 1, characterized in that the step: determining whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value specifically includes: A voltage detection comparator or current comparator is used to determine whether the equivalent resistance or equivalent voltage exceeds the corresponding preset value. A microphone circuit, characterized in that it includes: an oil leakage detection unit circuit; the oil leakage detection unit circuit includes: An oil leakage detection pin provided on the microphone circuit package is used to detect the equivalent resistance and/or equivalent voltage of the environment in which the microphone circuit package is located; A detection circuit provided in the microphone circuit package is electrically connected to the oil leakage detection pin, and is used to determine whether the equivalent resistance and/or equivalent voltage exceeds the corresponding preset value, and when the When the equivalent resistance and/or equivalent voltage exceed the preset value, the microphone circuit stops working signal. The microphone circuit according to claim 5, wherein an intermittent or continuous electrical signal is applied to the oil leakage detection pin. The microphone circuit according to claim 5, characterized in that the detection circuit is a voltage detection comparator or a current comparator. The microphone circuit according to claim 5, wherein the oil leakage detection pin is multiplexed with the charging pin on the microphone circuit package. A microphone, characterized in that the microphone circuit is provided with the microphone circuit according to any one of claims 5-8. An electronic product, characterized in that the microphone according to claim 9 is provided on the electronic product.

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