Control detection circuit and electrical equipment

Abstract

The utility model discloses a control detection circuit and electrical equipment. The control detection circuit comprises a first switch module, a sampling module, a second switch module and a control module. The first switch module is connected between a power supply end and a load end, and the sampling module is connected in a first branch; the second switch module is connected in parallel with the first switch module; the control module is electrically connected with the first switch module, the second switch module and the sampling module and is used for acquiring a sampling signal under the condition that the first switch module is in an on state and the second switch module is in an off state; and based on the sampling signal, the first switch module is controlled to be in an off state and the second switch module is controlled to be in an on state. According to the control detection circuit, the situation that when the load is in an abnormal state, the second switch module is mistakenly conducted, so that the shell of the electrical equipment is melted and even fire disasters are caused can be avoided, and the working safety of the electrical equipment is ensured.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more specifically, to a control and detection circuit and electrical equipment. Background Technology

[0002] In existing electrical equipment (e.g., LED lighting), a switching transistor (e.g., MOSFET) is typically connected between the power supply of the adapter and the downstream load, and a controller (e.g., main control chip) controls the switching transistor to turn on or off in order to supply power to the downstream load.

[0003] However, if the back-end load is in an abnormal state (e.g., short circuit, reduced impedance to ground, etc.), it will cause a large current to be generated in the circuit where the back-end load is located, which will in turn cause high heat to be generated locally in the electrical equipment, causing the casing of the electrical equipment to melt or even cause a fire and other safety accidents. Utility Model Content

[0004] This application provides a control and detection circuit and electrical equipment.

[0005] According to a first aspect of this application, an embodiment of this application provides a control detection circuit. The control detection circuit includes a power supply terminal for connecting to a power source and a load terminal for connecting to a load. The control detection circuit includes a first switching module, a sampling module, a second switching module, and a control module. The first switching module is connected between the power supply terminal and the load terminal, and is used to turn on or off a first branch between the power supply terminal and the load terminal. The sampling module is connected in the first branch and is used to acquire a sampling signal from the first branch, the sampling signal including at least one of a current sampling signal and a voltage sampling signal. The second switching module is connected in parallel with the first switching module and is used to turn on or off a second branch between the power supply terminal and the load terminal. The control module is electrically connected to the first switching module, the second switching module, and the sampling module, respectively, and is used to acquire the sampling signal when the first switching module is in a conducting state and the second switching module is in a disconnected state; and based on the sampling signal, control the first switching module to be in a disconnected state and control the second switching module to be in a conducting state.

[0006] In some possible embodiments, the first switching module includes a first field-effect transistor (FET), which is connected between the power supply terminal and the load terminal, and the control terminal of the first FET is connected to the control module; wherein the operating current of the first FET is greater than or equal to the current of the load in standby mode.

[0007] In some possible embodiments, the first field-effect transistor is an enhancement-mode P-channel field-effect transistor, the gate of the first field-effect transistor is connected to the control module, the source of the first field-effect transistor is connected to the power supply terminal, and the drain of the first field-effect transistor is connected to the load terminal.

[0008] In some possible embodiments, the first switching module further includes a first transistor, and the control terminal of the first field-effect transistor is connected to the control module through the first transistor.

[0009] In some possible embodiments, the second switching module includes a second field-effect transistor (FET), which is connected between the power supply terminal and the load terminal, and the control terminal of the second FET is connected to the control module; wherein the operating current of the second FET is greater than or equal to the current of the load when it is in the operating state.

[0010] In some possible embodiments, the sampling module includes a current sampling module, and the sampling signal is a current sampling signal; the current sampling module is connected in series in the first branch to be connected in series with the first switching module; the current sampling module is electrically connected to the control module.

[0011] In some possible embodiments, the control module has a first detection terminal and a second detection terminal; the current sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor, with the first resistor connected in series with the first switch module; one end of the second and third resistors connected in series is connected to the first end of the first resistor, and the other end is grounded; the common terminal formed by the second and third resistors connected in series is connected to the first detection terminal; one end of the fourth and fifth resistors connected in series is connected to the second end of the first resistor, and the other end is grounded; the common terminal formed by the fourth and fifth resistors connected in series is connected to the second detection terminal.

[0012] In some possible embodiments, the sampling module includes a voltage sampling module, and the sampling signal is a voltage sampling signal; one end of the voltage sampling module is connected in the first branch, the other end of the voltage sampling module is grounded, and the detection end of the voltage sampling module is electrically connected to the control module.

[0013] In some possible embodiments, the control module is provided with a third detection terminal; the voltage sampling module includes a sixth resistor and a seventh resistor; one end of the sixth resistor and the seventh resistor connected in series is connected to the first branch, and the other end is grounded; the common terminal formed by the sixth resistor and the seventh resistor connected in series is the detection terminal of the voltage sampling module and is connected to the third detection terminal.

[0014] According to a second aspect of this application, embodiments of this application also provide an electrical device, which includes the control and detection circuit, adapter, and load described above. The control and detection circuit has a power supply terminal and a load terminal; the adapter is connected to the power supply terminal, and the load is connected to the load terminal.

[0015] This application provides a control and detection circuit and an electrical device. The control and detection circuit has a power supply terminal for connecting to a power source and a load terminal for connecting to a load. The control and detection circuit includes a first switching module, a sampling module, a second switching module, and a control module. The first switching module is connected between the power supply terminal and the load terminal, and is used to connect or disconnect a first branch between the power supply terminal and the load terminal. The sampling module is connected in the first branch and is used to acquire a sampling signal from the first branch, the sampling signal including at least one of a current sampling signal and a voltage sampling signal. The second switching module is connected in parallel with the first switching module and is used to connect or disconnect a second branch between the power supply terminal and the load terminal.

[0016] The control module is electrically connected to the first switch module, the second switch module, and the sampling module, respectively. It is used to acquire the sampling signal when the first switch module is in the on state and the second switch module is in the off state; and based on the sampling signal, control the first switch module to be in the off state and control the second switch module to be in the on state.

[0017] Taking a current sampling signal as an example, if the amplitude of the current sampling signal is within the specified current range, it indicates that the load connected to the load terminal is not in an abnormal state. In this case, the control module can control the second switch module to be in the conducting state to allow the power supply to the load. Conversely, if the amplitude of the current sampling signal is not within the specified current range, it indicates that the load connected to the load terminal is in an abnormal state. In this case, the control module can control the second switch module to be in the disconnected state to stop supplying power to the load.

[0018] Therefore, the control detection circuit in this application can prevent the second switch module from making a false turn when the load is in an abnormal state, which could lead to the melting of the electrical equipment casing or even a fire, thus ensuring the safe operation of the electrical equipment equipped with the control detection circuit.

[0019] In addition, when the second switch module is in the on state, the control module will also control the first switch module to be in the off state to prevent the sampling module connected in the first branch from accessing the power supply circuit and affecting the normal power supply of the load, so as to ensure the normal operation of the electrical equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application.

[0022] Figure 2 yes Figure 1 A schematic diagram of a control and detection circuit in the electrical equipment shown.

[0023] Figure 3 yes Figure 2 The circuit structure diagram of the first switch module in the control and detection circuit shown is shown.

[0024] Figure 4 yes Figure 2 The circuit structure diagram of the second switch module in the control and detection circuit shown is shown.

[0025] Figure 5 yes Figure 2 The diagram shows a circuit structure of the sampling module in the control and detection circuit.

[0026] Figure 6 yes Figure 2 The diagram shows another circuit structure of the sampling module in the control and detection circuit.

[0027] Figure 7 yes Figure 1 Another schematic diagram of the control and detection circuit in the electrical device shown. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0029] This application provides a control detection circuit 100 and an electrical device 200 configured with the control detection circuit 100. The electrical device 200 can be a smart home device, wherein the smart home device integrates a control module (e.g., control circuit, control chip, etc.) to realize intelligent control of the smart home device. Specifically, the smart home device can be a smart lighting fixture, a smart speaker, a robot vacuum cleaner, a smart juicer, a smart rice cooker, etc. Of course, the electrical device 200 can also be a household appliance, such as a washing machine, a refrigerator, an electric heater, an air conditioner, etc. This embodiment does not limit the specific type of the electrical device 200; in the following description, a smart lighting fixture is used as an example of the electrical device 200.

[0030] Please see Figure 1The electrical device 200 may include a control and detection circuit 100, an adapter 201, and a load 203. The control and detection circuit 100 has a power supply terminal 12 and a load terminal 14. The adapter 201 is connected to the power supply terminal 12 and is used to convert the power supply voltage (i.e., mains voltage) into a power supply voltage compatible with the load 203. Specifically, the adapter 201 may integrate a filter circuit, a voltage conversion circuit, a rectifier circuit, etc., but this embodiment does not limit this.

[0031] Load 203 is connected to load terminal 14. Load 203 refers to the functional load in electrical equipment 200, which is used to realize the various functions of electrical equipment 200. For example, load 203 in smart lighting fixtures is an LED light, load 203 in smart speakers is a speaker, etc. This embodiment does not limit this.

[0032] It should be noted that the control detection circuit 100 in this embodiment is used to control the connection and disconnection of the branch between the control adapter 201 and the load 203. The load 203 also has an independent control switch to turn the load 203 on or off. Specifically, when the control switch is in the on state, the load 203 is in the working state; when the control switch is in the off state, the load 203 is in the standby state.

[0033] Please see Figure 2 The control and detection circuit 100 has a power supply terminal 12 for connecting a power source (e.g., adapter 201) and a load terminal 14 for connecting a load. The control and detection circuit 100 may include a first switch module 20, a sampling module 30, a second switch module 40, and a control module 50. The first switch module 20 is connected between the power supply terminal 12 and the load terminal 14, and is used to turn on or off a first branch S1 between the power supply terminal 12 and the load terminal 14. "First branch S1" refers to the branch where the first switch module 20 is located. The sampling module 30 is connected in the first branch S1 and is used to acquire a sampling signal from the first branch S1, which includes at least one of a current sampling signal and a voltage sampling signal. The second switch module 40 is connected in parallel with the first switch module 20 and is used to turn on or off a second branch S2 between the power supply terminal 12 and the load terminal 14. "Second branch S2" refers to the branch where the second switch module 40 is located.

[0034] The control module 50 is electrically connected to the first switch module 20, the second switch module 40, and the sampling module 30, respectively. It is used to acquire a sampling signal when the first switch module 20 is in the ON state and the second switch module 40 is in the OFF state; and based on the sampling signal, to control the first switch module 20 to be in the OFF state and to control the second switch module 40 to be in the ON state. Specifically, the control module 50 can be a control chip or a hardware control circuit integrating multiple electronic devices (e.g., signal comparators, operational amplifiers, etc.).

[0035] Taking a current sampling signal as an example, if the amplitude of the current sampling signal is within the specified current range, it indicates that the load 203 connected to load terminal 14 is not in an abnormal state. In this case, the control module 50 can control the second switch module 40 to be in the conducting state so that the power supply can supply power to the load 203. Conversely, if the amplitude of the current sampling signal is not within the specified current range, it indicates that the load 203 connected to load terminal 14 is in an abnormal state. In this case, the control module 50 can control the second switch module 40 to be in the disconnected state to stop supplying power to the load 203.

[0036] Therefore, the control detection circuit 100 in this application can prevent the second switch module 40 from being falsely turned on when the load 203 is in an abnormal state, which could lead to the melting of the casing of the electrical equipment 200 or even a fire, thus ensuring the safe operation of the electrical equipment 200 equipped with the control detection circuit 100.

[0037] In addition, when the second switch module 40 is in the conducting state, the control module 50 will also control the first switch module 20 to be in the disconnected state, so as to prevent the sampling module 30 connected in the first branch S1 from being connected to the power supply circuit, thereby affecting the normal power supply of the load 203, so as to ensure the normal operation of the electrical equipment 200.

[0038] The specific circuit structure of the control and detection circuit 100 is described below.

[0039] Please see Figure 3The first switching module 20 may include a first field-effect transistor 210, which is connected between the power supply terminal 12 and the load terminal 14. The control terminal of the first field-effect transistor 210 is connected to the control module 50, and is used to turn on or off the first branch S1 between the power supply terminal 12 and the load terminal 14. The operating current of the first field-effect transistor 210 is greater than or equal to the current of the load 203 in standby mode. Specifically, the first field-effect transistor 210 may be a metal-oxide-semiconductor field-effect transistor (MOSFET) or a junction field-effect transistor (JFET).

[0040] The “operating current of the first field-effect transistor 210” here can be understood as the maximum current that the first field-effect transistor 210 can withstand when it is in the conducting state.

[0041] The "current of load 203 in standby mode" here can be understood as the standby current of load 203. Taking load 203 as an LED light as an example, when load 203 is in standby mode, it means that the LED light is off, but the IC control circuit of the LED light is working. This means that even when the LED light is off, there will still be a certain current at load 203 (that is, standby current).

[0042] Specifically, the current of load 203 in standby mode can be calculated by the R&D personnel based on the circuit parameters corresponding to load 203, or it can be summarized by the R&D personnel based on the test data of load 203. This embodiment does not limit this. Taking the current of load 203 in standby mode as 1A as an example, the operating current of the first field-effect transistor 210 is greater than or equal to 1A. This can avoid the situation where the current is too large when the first field-effect transistor 210 is in the conducting state, thus preventing the first field-effect transistor 210 from being damaged due to breakdown, and ensuring the safe operation of the first field-effect transistor 210.

[0043] In some possible examples, the operating current of the first field-effect transistor 210 is greater than the standby current of the load 203, so that the operating current of the first field-effect transistor 210 has a certain safety margin on top of the standby current of the load 203, in order to further ensure the safe operation of the first field-effect transistor 210. For example, taking the standby current of the load 203 as 1A as an example, the operating current of the first field-effect transistor 210 can be 1.1A, 1.2A, 1.3A, 1.5A, 2A, etc.

[0044] exist Figure 3In the illustrated embodiment, the first field-effect transistor 210 is an enhancement-mode P-channel field-effect transistor, which has advantages such as high input impedance and low power consumption. The gate of the first field-effect transistor 210 (i.e., the control terminal of the first field-effect transistor 210) is connected to the control module 50, the source of the first field-effect transistor 210 is connected to the power supply terminal 12, and the drain of the first field-effect transistor 210 is connected to the load terminal 14.

[0045] In some possible embodiments, the gate of the first field-effect transistor 210 can be directly connected to the first control terminal 501 of the control module 50, so that when the first control terminal 501 outputs a low-level signal, the first field-effect transistor 210 is in the conducting state; conversely, when the first control terminal 501 outputs a high-level signal, the first field-effect transistor 210 is in the off state.

[0046] In other possible embodiments, such as Figure 3 As shown, the first switching module 20 may further include a first transistor 230, and the control terminal of the first field-effect transistor 210 is connected to the control module 50 through the first transistor 230. Therefore, Figure 3 The embodiment shown adopts a circuit architecture that uses a transistor to drive a MOSFET. This architecture combines the signal amplification capability of a transistor with the low loss and high switching speed of a MOSFET, enabling the first switching module 20 to have advantages such as high driving capability, low power consumption, strong anti-interference capability, fast switching, and high voltage resistance.

[0047] Specifically, in Figure 3 In the embodiment shown, the first transistor 230 is an NPN bipolar junction transistor (BJT). The base of the first transistor 230 is connected to the first control terminal 501 of the control module 50, the collector of the first transistor 230 is connected to the gate of the first field-effect transistor 210, and the emitter of the first transistor 230 is grounded.

[0048] Therefore, when the first control terminal 501 outputs a high-level signal, the first transistor 230 is in the conducting state, which grounds the gate of the first field-effect transistor 210, thereby making the first field-effect transistor 210 in the conducting state; conversely, when the first control terminal 501 outputs a low-level signal, the first transistor 230 is in the off state, and the first field-effect transistor 210 is in the off state.

[0049] exist Figure 3In the illustrated embodiment, the first switch module 20 may further include a first protection resistor R01, a second protection resistor R02, a third protection resistor R03, a fourth protection resistor R04, and a first protection capacitor C01. The first protection resistor R01 is connected between the first control terminal 501 of the control module 50 and the base of the first transistor 230. One end of the second protection resistor R02 is connected to the base of the first transistor 230, and the other end is grounded. The first protection resistor R01 and the second protection resistor R02 serve as base bias resistors for the first transistor 230, limiting the base current of the first transistor 230 and protecting it. The third protection resistor R03 is connected between the collector of the first transistor 230 and the gate of the first field-effect transistor 210. The fourth protection resistor R04 is connected between the power supply terminal 12 and the gate of the first field-effect transistor 210. These resistors ensure a certain voltage drop between the gate and source of the first field-effect transistor 210 when the first transistor 230 is turned on, thus ensuring smooth conduction of the first field-effect transistor 210. The first protection capacitor C01 is connected between the power supply terminal 12 and the gate of the first field-effect transistor 210, and is connected in parallel with the fourth protection resistor R04. This suppresses voltage fluctuations at the power supply terminal 12, preventing false turn-on of the first field-effect transistor 210.

[0050] Of course, in some other possible embodiments, the first field-effect transistor 210 can also be other types of transistors, such as depletion-mode P-channel field-effect transistors, enhancement-mode N-channel field-effect transistors, etc. In this case, the researchers can design the corresponding peripheral circuits according to the specific implementation of the first field-effect transistor 210, and this embodiment does not limit this.

[0051] Please see Figure 4 The second switching module 40 may include a second field-effect transistor 410, which is connected between the power supply terminal 12 and the load terminal 14. The control terminal of the second field-effect transistor 410 is connected to the control module 50, and is used to turn on or off the second branch S2 between the power supply terminal 12 and the load terminal 14. The operating current of the second field-effect transistor 410 is greater than or equal to the current of the load 203 when it is in operation. Specifically, the second field-effect transistor 410 may be a metal-oxide-semiconductor field-effect transistor (MOSFET) or a junction field-effect transistor (JFET).

[0052] The “operating current of the second field-effect transistor 410” here can be understood as the maximum current that the second field-effect transistor 410 can withstand when it is in the conducting state.

[0053] The "current of load 203 when it is in operation" here can be understood as the operating current of load 203, which is greater than the standby current of load 203. Taking load 203 as an LED light as an example, when load 203 is in operation, it means that the LED light is lit.

[0054] Specifically, the current of load 203 in its operating state can be calculated by the R&D personnel based on the circuit parameters corresponding to load 203, or it can be summarized by the R&D personnel based on the test data of load 203. This embodiment does not limit this. Taking the current of load 203 in its operating state as 3A as an example, the operating current of the second field-effect transistor 410 is greater than or equal to 3A. This can prevent the second field-effect transistor 410 from being damaged by excessive current when it is in the conducting state, thus ensuring the safe operation of the second field-effect transistor 410.

[0055] In some possible examples, the operating current of the second field-effect transistor 410 is greater than the current of the load 203 when it is in operation, so that the operating current of the second field-effect transistor 410 has a certain safety margin on top of the operating current of the load 203, in order to further ensure the safe operation of the second field-effect transistor 410. For example, taking the current of the load 203 when it is in operation as 3A, the operating current of the second field-effect transistor 410 can be 3.1A, 3.3A, 3.6A, 4A, etc.

[0056] exist Figure 4 In the illustrated embodiment, the second field-effect transistor 410 is an enhancement-mode P-channel field-effect transistor, which has advantages such as high input impedance and low power consumption. The gate of the second field-effect transistor 410 (i.e., the control terminal of the second field-effect transistor 410) is connected to the control module 50, the source of the second field-effect transistor 410 is connected to the power supply terminal 12, and the drain of the second field-effect transistor 410 is connected to the load terminal 14.

[0057] In some possible embodiments, the gate of the second field-effect transistor 410 can be directly connected to the second control terminal 503 of the control module 50, so that when the second control terminal 503 outputs a low-level signal, the second field-effect transistor 410 is in the conducting state; conversely, when the second control terminal 503 outputs a high-level signal, the second field-effect transistor 410 is in the off state.

[0058] In other possible embodiments, such as Figure 4 As shown, the second switching module 40 may further include a second transistor 430, and the control terminal of the second field-effect transistor 410 is connected to the control module 50 through the second transistor 430. Therefore, Figure 4The embodiment shown adopts a circuit architecture that uses a transistor to drive a MOSFET. This architecture combines the signal amplification capability of a transistor with the low loss and high switching speed of a MOSFET, enabling the second switching module 40 to have advantages such as high driving capability, low power consumption, strong anti-interference capability, fast switching, and high withstand voltage.

[0059] Specifically, in Figure 4 In the embodiment shown, the second transistor 430 is an NPN bipolar junction transistor (BJT). The base of the second transistor 430 is connected to the second control terminal 503 of the control module 50, the collector of the second transistor 430 is connected to the gate of the second field-effect transistor 410, and the emitter of the second transistor 430 is grounded.

[0060] Therefore, when the second control terminal 503 outputs a high-level signal, the second transistor 430 is in the conducting state, which grounds the gate of the second field-effect transistor 410, thereby making the second field-effect transistor 410 in the conducting state; conversely, when the second control terminal 503 outputs a low-level signal, the second transistor 430 is in the off state, and the second field-effect transistor 410 is in the off state.

[0061] exist Figure 4 In the illustrated embodiment, the second switch module 40 may further include a fifth protection resistor R05, a sixth protection resistor R06, a seventh protection resistor R07, an eighth protection resistor R08, and a second protection capacitor C02. The fifth protection resistor R05 is connected between the second control terminal 503 of the control module 50 and the base of the second transistor 430. One end of the sixth protection resistor R06 is connected to the base of the second transistor 430, and the other end is grounded. The fifth and sixth protection resistors R05 and R06 serve as base bias resistors for the second transistor 430, limiting the base current of the second transistor 430 and protecting it. The seventh protection resistor R07 is connected between the collector of the second transistor 430 and the gate of the second field-effect transistor 410. The eighth protection resistor R08 is connected between the power supply terminal 12 and the gate of the second field-effect transistor 410. These resistors ensure a certain voltage drop between the gate and source of the second field-effect transistor 410 when the second transistor 430 is turned on, thus ensuring smooth conduction of the second field-effect transistor 410. The second protection capacitor C02 is connected between the power supply terminal 12 and the gate of the second field-effect transistor 410, and is connected in parallel with the eighth protection resistor R08. This capacitor suppresses voltage fluctuations at the power supply terminal 12, preventing false turn-on of the second field-effect transistor 410.

[0062] Of course, in some other possible embodiments, the second field-effect transistor 410 can also be other types of transistors, such as depletion-mode P-channel field-effect transistors, enhancement-mode N-channel field-effect transistors, etc. In this case, the researchers can design the corresponding peripheral circuits according to the specific implementation of the second field-effect transistor 410, and this embodiment does not limit this.

[0063] In this embodiment, the sampling module 30 is connected in the first branch S1 and is used to acquire the sampling signal of the first branch S1 when the first switch module 20 is in the on state. The sampling signal may include at least one of a current sampling signal and a voltage sampling signal. For example, if the sampling module 30 is a current sampling module, the corresponding sampling signal is a current sampling signal; or if the sampling module 30 is a voltage sampling module, the corresponding sampling signal is a voltage sampling signal.

[0064] It's easy to understand that if the load 203 experiences an anomaly such as a short circuit or a decrease in its impedance to ground, the corresponding sampling signal will also become abnormal. For example, taking a current sampling signal as an example, if the impedance of the load 203 to ground decreases, the current sampling signal will increase. Therefore, the control module 50 can determine whether the load 203 is malfunctioning based on the changes in the sampling signal. The specific circuit structure of the sampling module 30 is described below.

[0065] Please see Figure 5 The sampling module 30 may include a current sampling module 320, and the sampled signal is a current sampling signal, that is, the current value of the first branch S1. The current sampling module 320 is connected in series in the first branch S1, so as to be connected in series with the first switch module 20. The current sampling module 320 is electrically connected to the control module 50 so that the control module 50 can receive the current sampling signal detected by the current sampling module 320.

[0066] Specifically, in Figure 5 In the illustrated embodiment, the control module 50 may have a first detection terminal 502 and a second detection terminal 504. The current sampling module 320 may include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, with the first resistor R1 connected in series with the first switching module 20 to function as a voltage divider.

[0067] One end of the series connection of the second resistor R2 and the third resistor R3 is connected to the first end of the first resistor R1 (that is, the end of the first resistor R1 connected to the first switch module 20), and the other end of the series connection of the second resistor R2 and the third resistor R3 is grounded; the common terminal formed by the series connection of the second resistor R2 and the third resistor R3 is connected to the first detection terminal 502. Specifically, the second resistor R2 and the third resistor R3 can divide the voltage at the first end of the first resistor R1 to avoid the voltage value input to the first detection terminal 502 being too large.

[0068] One end of the series connection of the fourth resistor R4 and the fifth resistor R5 is connected to the second end of the first resistor R1 (that is, the end of the first resistor R1 connected to the load terminal 14), and the other end of the series connection of the fourth resistor R4 and the fifth resistor R5 is grounded; the common terminal formed by the series connection of the fourth resistor R4 and the fifth resistor R5 is connected to the second detection terminal 504. Specifically, the fourth resistor R4 and the fifth resistor R5 can divide the voltage at the second end of the first resistor R1 to avoid the voltage value input to the second detection terminal 504 being too large.

[0069] Specifically, the control module 50 can pre-store the current threshold corresponding to the load 203 under normal conditions. This current threshold can be calculated by R&D personnel through test records during the early stages of product design. Specifically, the current threshold can be calculated using the following formula: ;in, For current threshold, The voltage value detected by the first detection terminal 502 when the load 203 is in a normal state; The voltage value detected by the second detection terminal 504 when the load 203 is in a normal state; Let R1 be the resistance value of the first resistor. Of course, the amplitude of the current sampling signal can also be calculated using the above formula.

[0070] In some possible embodiments, the control module 50 can indicate that the amplitude of the current sampling signal is within a specified current range if it detects that the amplitude is less than or equal to the current threshold. In this case, the control module 50 can control the first switch module 20 to be in the off state and control the second switch module 40 to be in the on state. Conversely, the control module 50 can indicate that the amplitude of the current sampling signal is not within the specified current range if it detects that the amplitude is greater than the current threshold. In this case, the control module 50 can control both the first switch module 20 and the second switch module 40 to be in the off state.

[0071] In other possible embodiments, the control module 50 can set a current safety threshold based on the current threshold, where the current safety threshold is greater than the current threshold. For example, 110% of the current threshold can be used as the current safety threshold. For instance, if the current threshold is 1A, the current safety threshold is 1.1A. In this case, if the amplitude of the detected current sampling signal is less than or equal to the current safety threshold, it indicates that the signal is within the specified current range; otherwise, it indicates that the signal is not within the specified current range. This embodiment, by setting a current safety threshold, can prevent the second switching module 40 from failing to conduct when the power supply voltage fluctuates, thus ensuring the normal operation of the electrical equipment 200.

[0072] In this embodiment, the control module 50 is used to determine whether the amplitude of the current sampling signal is within a specified current range. In some possible examples, the control module 50 can be a control chip, in which a corresponding judgment program can be pre-written to determine whether the amplitude of the current sampling signal is within the specified current range. In other possible examples, the control module 50 can be a control circuit, which can integrate a signal comparator to determine whether the amplitude of the current sampling signal is less than or equal to a current threshold. For example, if the amplitude of the current sampling signal is less than or equal to the current threshold, the signal comparator can output a high-level signal to control the second switch module 40 to turn on; conversely, if the amplitude of the current sampling signal is greater than the current threshold, the signal comparator can output a low-level signal to control the second switch module 40 to turn off.

[0073] Please see Figure 6 The sampling module 30 may include a voltage sampling module 340, and the sampling signal is a voltage sampling signal. One end of the voltage sampling module 340 is connected to the first branch S1, and the other end of the voltage sampling module 340 is grounded. The detection terminal 3401 of the voltage sampling module 340 is electrically connected to the control module 50 so that the control module 50 can receive the voltage sampling signal detected by the voltage sampling module 340.

[0074] Specifically, in Figure 6 In the illustrated embodiment, the control module 50 is provided with a third detection terminal 506. The voltage sampling module 340 may include a sixth resistor R6 and a seventh resistor R7. One end of the series connection of the sixth resistor R6 and the seventh resistor R7 is connected to the first branch S1, and the other end is grounded. The common terminal formed by the series connection of the sixth resistor R6 and the seventh resistor R7 is the detection terminal 3401 of the voltage sampling module 340, and is connected to the third detection terminal 506. Specifically, the sixth resistor R6 and the seventh resistor R7 can divide the voltage of the first branch S1 to avoid the voltage value input to the third detection terminal 506 being too large.

[0075] It is easy to understand that when the first switch module 20 is turned on and the load 203 is working normally, the voltage of the first branch S1 is approximately equal to the output voltage of the adapter 201; if the load 203 experiences a short circuit, a decrease in impedance to ground, or other abnormalities, the voltage of the first branch S1 will be pulled down.

[0076] Specifically, the control module 50 can pre-store the voltage threshold corresponding to the load 203 under normal conditions. This voltage threshold can be calculated by R&D personnel through test records during the early stages of product design. Specifically, the voltage threshold can be calculated using the following formula: ;in, Voltage threshold The output voltage of adapter 201, This refers to the resistance value of the sixth resistor, R6. This is the resistance value of the seventh resistor, R7. Of course, the amplitude of the voltage sampling signal can also be calculated using the above formula.

[0077] In some possible embodiments, the control module 50 can indicate that the amplitude of the voltage sampling signal is within a specified voltage range if it detects that the amplitude is greater than or equal to the voltage threshold. In this case, the control module 50 can control the first switch module 20 to be in the off state and control the second switch module 40 to be in the on state. Conversely, the control module 50 can indicate that the amplitude of the voltage sampling signal is not within the specified voltage range if it detects that the amplitude is less than the voltage threshold. In this case, the control module 50 can control both the first switch module 20 and the second switch module 40 to be in the off state.

[0078] In other possible embodiments, the control module 50 can set a voltage safety threshold based on the voltage threshold, where the voltage safety threshold is less than the voltage threshold, for example, 90% of the voltage threshold. For instance, if the voltage threshold is 1V, the voltage safety threshold is 0.9V. In this case, if the amplitude of the detected voltage sampling signal is greater than or equal to the voltage safety threshold, it indicates that the voltage is within the specified range; otherwise, it indicates that the voltage is not within the specified range. This embodiment, by setting a voltage safety threshold, can prevent the second switching module 40 from failing to conduct when the power supply voltage fluctuates, thus ensuring the normal operation of the electrical equipment 200.

[0079] In this embodiment, the control module 50 is used to determine whether the amplitude of the voltage sampling signal is within a specified voltage range. In some possible examples, the control module 50 can be a control chip, in which a corresponding judgment program can be pre-written to determine whether the amplitude of the voltage sampling signal is within the specified voltage range. In other possible examples, the control module 50 can be a control circuit, which can integrate a signal comparator to determine whether the amplitude of the voltage sampling signal is greater than or equal to a voltage threshold. For example, if the amplitude of the voltage sampling signal is greater than or equal to the voltage threshold, the signal comparator can output a high-level signal to control the second switch module 40 to turn on; conversely, if the amplitude of the voltage sampling signal is less than the voltage threshold, the signal comparator can output a low-level signal to control the second switch module 40 to turn off.

[0080] In some possible embodiments, the control module 50 can communicate with a smart terminal (e.g., a smartphone, tablet, etc.) and send a reminder message to the smart terminal when it is determined that the load 203 is abnormal, so as to remind the user to repair or replace the electrical equipment 200 in a timely manner.

[0081] Please see Figure 7 In some possible embodiments, the power supply terminal 12 may include a first power supply terminal 1201 and a second power supply terminal 1203, wherein the first power supply terminal 1201 is connected to the output terminal of the adapter 201, and the second power supply terminal 1203 is grounded through the fuse FB to ensure that the adapter 201 is disconnected in time when the current in the branch where the control detection circuit 100 is located exceeds the safe current threshold, so as to achieve short circuit protection for the load 203.

[0082] exist Figure 7 In the illustrated embodiment, the control detection circuit 100 further includes a third protection capacitor C03 and a fourth protection capacitor C04. One end of the third protection capacitor C03 is connected to the first power supply terminal 1201, and the other end is grounded. It can suppress voltage fluctuations at the first power supply terminal 1201 to ensure that the load 203 can operate smoothly. One end of the fourth protection capacitor C04 is connected to the load terminal 14, and the other end is grounded. It can suppress voltage fluctuations at the load terminal 14 to ensure that the load 203 can operate smoothly.

[0083] This application provides a control detection circuit 100 and an electrical device 200 configured with the control detection circuit 100. The control detection circuit 100 has a power supply terminal 12 for connecting to a power source (e.g., an adapter 201) and a load terminal 14 for connecting to a load. The control detection circuit 100 may include a first switch module 20, a sampling module 30, a second switch module 40, and a control module 50. The first switch module 20 is connected between the power supply terminal 12 and the load terminal 14, and is used to turn on or off a first branch S1 between the power supply terminal 12 and the load terminal 14. The sampling module 30 is connected in the first branch S1 and is used to acquire a sampling signal from the first branch S1, the sampling signal including at least one of a current sampling signal and a voltage sampling signal. The second switch module 40 is connected in parallel with the first switch module 20 and is used to turn on or off a second branch S2 between the power supply terminal 12 and the load terminal 14.

[0084] The control module 50 is electrically connected to the first switch module 20, the second switch module 40 and the sampling module 30 respectively. It is used to acquire the sampling signal when the first switch module 20 is in the on state and the second switch module 40 is in the off state; and based on the sampling signal, control the first switch module 20 to be in the off state and control the second switch module 40 to be in the on state.

[0085] Taking a current sampling signal as an example, if the amplitude of the current sampling signal is within the specified current range, it indicates that the load 203 connected to load terminal 14 is not in an abnormal state. In this case, the control module 50 can control the second switch module 40 to be in the conducting state so that the power supply can supply power to the load 203. Conversely, if the amplitude of the current sampling signal is not within the specified current range, it indicates that the load 203 connected to load terminal 14 is in an abnormal state. In this case, the control module 50 can control the second switch module 40 to be in the disconnected state to stop supplying power to the load 203.

[0086] Therefore, the control detection circuit 100 in this application can prevent the second switch module 40 from being falsely turned on when the load 203 is in an abnormal state, which could lead to the melting of the casing of the electrical equipment 200 or even a fire, thus ensuring the safe operation of the electrical equipment 200 equipped with the control detection circuit 100.

[0087] In addition, when the second switch module 40 is in the conducting state, the control module 50 will also control the first switch module 20 to be in the disconnected state, so as to prevent the sampling module 30 connected in the first branch S1 from being connected to the power supply circuit, thereby affecting the normal power supply of the load 203, so as to ensure the normal operation of the electrical equipment 200.

[0088] In this application specification, certain terms are used to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem within a certain margin of error and basically achieve the technical effect.

[0089] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0090] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A control detection circuit, characterized in that, The control and detection circuit includes a power supply terminal for connecting to a power source and a load terminal for connecting to a load. A first switch module is connected between the power supply terminal and the load terminal, and is used to connect or disconnect the first branch between the power supply terminal and the load terminal; A sampling module, connected in the first branch, is used to acquire the sampling signal of the first branch, wherein the sampling signal includes at least one of a current sampling signal and a voltage sampling signal; The second switch module, connected in parallel with the first switch module, is used to connect or disconnect the second branch between the power supply terminal and the load terminal; and The control module is electrically connected to the first switch module, the second switch module, and the sampling module, respectively, and is used to acquire the sampling signal when the first switch module is in the on state and the second switch module is in the off state; and based on the sampling signal, control the first switch module to be in the off state and control the second switch module to be in the on state.

2. The control and detection circuit according to claim 1, characterized in that, The first switching module includes a first field-effect transistor (FET), which is connected between the power supply terminal and the load terminal, and the control terminal of the first FET is connected to the control module; wherein, the operating current of the first FET is greater than or equal to the current of the load in standby mode.

3. The control and detection circuit according to claim 2, characterized in that, The first field-effect transistor is an enhancement-mode P-channel field-effect transistor. The gate of the first field-effect transistor is connected to the control module, the source of the first field-effect transistor is connected to the power supply terminal, and the drain of the first field-effect transistor is connected to the load terminal.

4. The control and detection circuit according to claim 2, characterized in that, The first switching module also includes a first transistor, and the control terminal of the first field-effect transistor is connected to the control module through the first transistor.

5. The control and detection circuit according to claim 1, characterized in that, The second switching module includes a second field-effect transistor (FET), which is connected between the power supply terminal and the load terminal, and the control terminal of the second FET is connected to the control module; wherein the operating current of the second FET is greater than or equal to the current of the load when it is in the operating state.

6. The control and detection circuit according to any one of claims 1 to 5, characterized in that, The sampling module includes a current sampling module, and the sampling signal is a current sampling signal; The current sampling module is connected in series in the first branch to be connected in series with the first switch module; the current sampling module is electrically connected to the control module.

7. The control and detection circuit according to claim 6, characterized in that, The control module is provided with a first detection terminal and a second detection terminal; the current sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, wherein the first resistor is connected in series with the first switch module; One end of the second resistor and the third resistor connected in series is connected to the first end of the first resistor, and the other end is grounded; the common terminal formed by the second resistor and the third resistor connected in series is connected to the first detection terminal; One end of the fourth resistor and the fifth resistor connected in series is connected to the second end of the first resistor, and the other end is grounded; the common terminal formed by the fourth resistor and the fifth resistor connected in series is connected to the second detection terminal.

8. The control and detection circuit according to any one of claims 1 to 5, characterized in that, The sampling module includes a voltage sampling module, and the sampling signal is a voltage sampling signal; One end of the voltage sampling module is connected to the first branch, the other end of the voltage sampling module is grounded, and the detection end of the voltage sampling module is electrically connected to the control module.

9. The control and detection circuit according to claim 8, characterized in that, The control module is equipped with a third detection terminal; the voltage sampling module includes a sixth resistor and a seventh resistor; One end of the sixth resistor and the seventh resistor connected in series is connected to the first branch, and the other end is grounded; the common terminal formed by the sixth resistor and the seventh resistor connected in series is the detection terminal of the voltage sampling module and is connected to the third detection terminal.

10. An electrical appliance, characterized in that, include: The control detection circuit as described in any one of claims 1 to 9 is provided with a power supply terminal and a load terminal; The adapter is connected to the power supply terminal; as well as The load is connected to the load end.

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