Household appliance current monitoring device

Abstract

The present invention discloses a household appliance current monitoring device, which relates to the technical field of household appliance monitoring devices. The monitoring device comprises a current sampling module and a data processing module. The current sampling module is used to collect the total load current and / or partial load current of several household appliances. The data processing module is used to process the total load current or partial load current collected by the current sampling module to obtain the total load current and / or partial load current. The monitoring device can monitor the operating current of a single load and monitor the operating current of multiple loads at the same time, thereby improving the safety of household appliances.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliance monitoring devices, and in particular to a household appliance current monitoring device. Background Art

[0002] Today's household appliances do not monitor the total operating current in real time. Once the appliance load becomes abnormal, it cannot be protected in time, which can easily lead to dangers such as fire and smoke, endangering user safety. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to provide a household appliance current monitoring device which can monitor the operating current of a single load as well as monitor the operating current of multiple loads simultaneously, thereby improving the safety of household appliances.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a household appliance current monitoring device, characterized in that: it includes a current sampling module and a data processing module, the current sampling module is used to collect the total load current and / or partial load current of several household appliances, the data processing module is used to process the total load current or partial load current collected by the current sampling module to obtain the total load current and / or partial load current, if it is found that the load working current is in an abnormal state, the load power supply is cut off and an alarm is issued to prompt the user.

[0005] A further technical solution is that the monitoring device includes a power supply module, the live wire L is divided into two paths, the first path is connected to the live wire input end of the power supply module, and the second path is connected to the output end of the power supply module, the neutral wire N is divided into several paths, the first path is connected to the neutral wire input end of the power supply module, and the other paths are respectively connected to the neutral wire terminals of several loads and their control circuits, one end of the current sampling module is connected to the current output end of the power supply module, and the other end of the current sampling module is divided into two paths, the first path is connected to the signal input end of the current data processing module, and the second path is connected to the current input end of the first load and its control circuit, the second to Nth loads and their control circuits are connected in parallel with the first load and its control circuit, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power supply module is respectively connected to the power input end of the current data processing module and the control chip to provide them with working power.

[0006] A further technical solution is that: the monitoring device includes a power supply module, the live wire L is divided into two paths, the first path is connected to the live wire input end of the power supply module, and the second path is connected to the power output end of the power supply module, the neutral wire N is divided into several paths, the first path is connected to the neutral wire input end of the power supply module, and the other paths are respectively connected to the neutral wire terminals of several loads and their control circuits, the current output end of the power supply module is divided into three paths, the first path is connected to the power input end of the first load and its control circuit, the second path is connected to the power input end of the second load and its control circuit, and the third path is connected to one end of the current sampling module, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the other paths are respectively connected to the power input ends of the third to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power supply module is respectively connected to the power input ends of the current data processing module and the control chip to provide working power for them.

[0007] A further technical solution is that: the monitoring device includes a power supply module, the live wire L is divided into several paths, the first path is connected to the live wire input end of the power supply module, and the remaining paths are respectively connected to the power supply input ends of the first to Nth loads and their control circuits, the power output end of the power supply module is VCC, the neutral wire N is divided into two paths, the first path is connected to the neutral wire input end of the power supply module, the second path is connected to the neutral wire output end of the power supply module, the neutral wire output end of the power supply module is grounded, one end of the current sampling module is grounded, and the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the current output ends of the first to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power supply module is respectively connected to the power input ends of the current data processing module and the control chip to provide them with working power.

[0008] A further technical solution is that the monitoring device includes a power module, the live wire L is divided into several paths, the first path is connected to the live wire input end of the power module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the power output end of the power module is VCC, the neutral wire N is divided into two paths, the first path is connected to the neutral wire input end of the power module, the second path is connected to the neutral wire output end of the power module, the neutral wire output end of the power module is grounded, the other end of the first load and its control circuit and the second load and its control circuit are grounded, one end of the current sampling module is grounded, and the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the current output ends of the third to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power module is respectively connected to the power input end of the current data processing module and the control chip to provide working power for them.

[0009] A further technical solution is that the monitoring device includes a current sampling module, one end of the current sampling module is connected to the power supply VDD, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the other ends of the first to Nth loads and their control circuits are grounded, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide them with working power.

[0010] A further technical solution is that: the current sampling module of the monitoring device, the power supply VDD is divided into three paths, the first path is connected to the power input end of the first load and its control circuit, the second path is connected to the power input end of the second load and its control circuit, the third path is connected to one end of the current sampling module, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the power input ends of the third to Nth loads and their control circuits, the other ends of the first to Nth loads and their control circuits are grounded, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide them with working power.

[0011] A further technical solution is that: the current sampling module of the monitoring device, the power supply VDD is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the other ends of the first to Nth loads and their control circuits are connected to one end of the current sampling module, the other end of the current sampling module is grounded, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide them with working power.

[0012] A further technical solution is that: the current sampling module of the monitoring device, the power supply VDD is divided into several paths, the first path is connected to the power input end of the first load and its control circuit, the second path is connected to the power input end of the second load and its control circuit, the other end of the first to second loads and their control circuits is grounded, and the remaining paths of the power supply VDD are respectively connected to the power input ends of the third to Nth loads and their control circuits, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the other ends of the third to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide them with working power.

[0013] A further technical solution is that: the current sampling module includes a sampling resistor, an AC transformer or a Hall sensor; when the current sampling module uses a sampling resistor, the sampling resistor includes resistors R1-R3 connected in series; or the sampling resistor includes resistors R1-R3 connected in parallel; or the sampling resistor includes resistors R1-R6, the resistor R1 is connected to one end of the resistor R5 via the resistor R2, the resistors R3-R4 are connected in parallel with the resistor R2, and the resistor R6 is connected in parallel with the resistor R5.

[0014] The beneficial effect of adopting the above technical solution is that: the present application samples the total operating current of the appliance through a current sampling sensor such as a sampling resistor, an AC transformer or a Hall sensor, and converts the current signal into a signal that can be read by the control chip of the appliance through a circuit, thereby realizing real-time monitoring of the total operating current of the appliance. By monitoring the normal operating current range of a single-channel load or multiple-channel loads, real-time monitoring of household appliance loads is realized. Once the load operating current exceeds the allowable range, the load action is immediately stopped and an alarm is issued to prompt the user that the appliance is in an abnormal state.

[0015] The present application can monitor both the total current of high-current loads and the local current of high-current loads; it can also monitor the total current of low-current loads, such as the current of control chips, the coil current of relays, the current of light-emitting diodes, the trigger current of thyristors, the current of display screens, and the current of liquid crystal panels. By monitoring the operating currents of various low-current loads, safe use of the product can be achieved.

[0016] Through current monitoring, part of the load operation status detection circuit can be omitted, which can reduce the overall cost. For example, in the detection of the closing circuit of the washing machine door lock, with the current monitoring circuit, this part of the circuit can be omitted through the logic control algorithm of the control chip, and the equivalent function can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 is a principle block diagram of the household appliance current monitoring device according to the first embodiment of the present invention;

[0019] Figure 2 is a principle block diagram of a household appliance current monitoring device according to a second embodiment of the present invention;

[0020] Figure 3 is a principle block diagram of a household appliance current monitoring device according to a third embodiment of the present invention;

[0021] Figure 4 is a principle block diagram of a household appliance current monitoring device according to a fourth embodiment of the present invention;

[0022] Figure 5 is a principle block diagram of a household appliance current monitoring device according to a fifth embodiment of the present invention;

[0023] Figure 6 is a principle block diagram of a household appliance current monitoring device according to a sixth embodiment of the present invention;

[0024] Figure 7 is a principle block diagram of a household appliance current monitoring device according to a seventh embodiment of the present invention;

[0025] Figure 8 is a principle block diagram of a household appliance current monitoring device according to an eighth embodiment of the present invention;

[0026] Fig. 9 It is a schematic diagram of a sampling resistor in the household appliance current monitoring device implemented in the present invention;

[0027] Fig.10 It is a schematic diagram of a sampling resistor in the household appliance current monitoring device implemented in the present invention;

[0028] Fig.11 It is a schematic diagram of a sampling resistor in the household appliance current monitoring device implemented in the present invention;

[0029] Fig.12 This is a reference flow chart for shutting down the load and giving an alarm when an abnormality occurs in the current monitoring of the present invention. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In general, the embodiment of the present invention discloses a household appliance current monitoring device, including a current sampling module and a data processing module, wherein the current sampling module is used to collect the total load current and / or partial load current of several household appliances, and the data processing module is used to process the total load current or partial load current collected by the current sampling module to obtain the total load current and / or partial load current. If it is found that the load working current is in an abnormal state, the load power supply is cut off, and an alarm is issued to prompt the user, such as Fig.12 shown.

[0033] The total current is sampled by the sampling resistor. The following example illustrates that the neutral line is equipotential with the GND ground, the sampling resistor R is at the GND end, and part or all of the current is sampled; the live line is equipotential with the VCC, the sampling resistor R is at the VCC end, and part or all of the current is sampled. The present application is not limited to the following combinations, the present application is not limited to whether the weak current end and the strong current end are equipotential, and the present application is not limited to using only resistors as current sampling sensors.

[0034] Embodiment 1

[0035] The weak current VCC is at the same potential as the live wire, the resistor R is at the VCC end, and the total current of all strong current loads is sampled.

[0036] like Figure 1As shown, an embodiment of the present invention discloses a household appliance current monitoring device, the monitoring device includes a power module, the live wire L is divided into two paths, the first path is connected to the live wire input end of the power module, and the second path is connected to the output end of the power module, the neutral wire N is divided into several paths, the first path is connected to the neutral wire input end of the power module, and the other paths are respectively connected to the neutral wire terminals of several loads and their control circuits, one end of the current sampling module is connected to the current output end of the power module, and the other end of the current sampling module is divided into two paths, the first path is connected to the signal input end of the current data processing module, and the second path is connected to the current input end of the first load and its control circuit, the second to Nth loads and their control circuits are connected in parallel with the first load and its control circuit, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power module is respectively connected to the power input end of the current data processing module and the control chip, for providing them with working power.

[0037] Embodiment 2

[0038] The weak current VCC is at the same potential as the live wire, the resistor R is at the VCC end, and the total current of some strong current loads is sampled.

[0039] like Figure 2 As shown, an embodiment of the present invention discloses a household appliance current monitoring device, the monitoring device includes a power module, the live wire L is divided into two paths, the first path is connected to the live wire input end of the power module, and the second path is connected to the power output end of the power module, the neutral wire N is divided into several paths, the first path is connected to the neutral wire input end of the power module, and the other paths are respectively connected to the neutral wire terminals of several loads and their control circuits, the current output end of the power module is divided into three paths, the first path is connected to the power input end of the first load and its control circuit, the second path is connected to the power input end of the second load and its control circuit, and the third path is connected to one end of the current sampling module, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the other paths are respectively connected to the power input ends of the third to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power module is respectively connected to the power input ends of the current data processing module and the control chip to provide working power for them.

[0040] Embodiment 3

[0041] The weak current ground and the neutral line have the same potential, and the sampling resistor R is at the weak current ground to sample all load currents.

[0042] like Figure 3As shown, an embodiment of the present invention discloses a household appliance current monitoring device, the monitoring device includes a power module, the live wire L is divided into several paths, the first path is connected to the live wire input end of the power module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the power output end of the power module is VCC, the neutral wire N is divided into two paths, the first path is connected to the neutral wire input end of the power module, the second path is connected to the neutral wire output end of the power module, the neutral wire output end of the power module is grounded, one end of the current sampling module is grounded, and the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the current output ends of the first to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power module is respectively connected to the power input end of the current data processing module and the control chip to provide working power for them.

[0043] Embodiment 4

[0044] The weak current ground and the neutral line have the same potential. The sampling resistor R is at the weak current ground to sample part of the strong current load current.

[0045] like Figure 4 As shown, an embodiment of the present invention discloses a household appliance current monitoring device, the monitoring device includes a power module, the live wire L is divided into several paths, the first path is connected to the live wire input end of the power module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the power output end of the power module is VCC, the neutral wire N is divided into two paths, the first path is connected to the neutral wire input end of the power module, the second path is connected to the neutral wire output end of the power module, the neutral wire output end of the power module is grounded, the other end of the first load and its control circuit and the second load and its control circuit are grounded, one end of the current sampling module is grounded, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the current output ends of the third to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power module is respectively connected to the power input end of the current data processing module and the control chip to provide working power for them.

[0046] Embodiment 5

[0047] The sampling resistor R is at the VDD end of the weak current load to sample all weak current load currents. VDD can be at the same potential as VCC or at different potentials. The signal ground and the power ground can be at the same potential or at different potentials.

[0048] like Figure 5As shown, an embodiment of the present invention discloses a household appliance current monitoring device, the monitoring device includes a current sampling module, one end of the current sampling module is connected to the power supply VDD, the other end of the current sampling module is divided into a plurality of paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the other ends of the first to Nth loads and their control circuits are grounded, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide working power for them.

[0049] Embodiment 6

[0050] The sampling resistor R is at the VDD end of the weak current load to sample part of the weak current load current. VDD can be at the same potential as VCC or at different potentials. The signal ground and the power ground can be at the same potential or at different potentials.

[0051] like Figure 6 As shown, an embodiment of the present invention discloses a household appliance current monitoring device, a current sampling module of the monitoring device, a power supply VDD is divided into three paths, the first path is connected to the power input end of the first load and its control circuit, the second path is connected to the power input end of the second load and its control circuit, the third path is connected to one end of the current sampling module, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the power input ends of the third to Nth loads and their control circuits, the other ends of the first to Nth loads and their control circuits are grounded, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide working power for them.

[0052] Embodiment 7

[0053] The sampling resistor R is at the power ground end of the weak current load to sample all the weak current load currents. VDD can be at the same potential as VCC or at different potentials. The signal ground and the power ground can be at the same potential or at different potentials.

[0054] like Figure 7As shown, an embodiment of the present invention discloses a household appliance current monitoring device, a current sampling module of the monitoring device, a power supply VDD is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the other ends of the first to Nth loads and their control circuits are connected to one end of the current sampling module, the other end of the current sampling module is grounded, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide working power for them.

[0055] Embodiment 8

[0056] The sampling resistor R is at the power ground end of the weak current load to sample part of the weak current load current. VDD can be at the same potential as VCC or at different potentials. The signal ground and the power ground can be at the same potential or at different potentials.

[0057] like Figure 8 As shown, an embodiment of the present invention discloses a household appliance current monitoring device, a current sampling module of the monitoring device, a power supply VDD is divided into several paths, a first path is connected to the power input end of the first load and its control circuit, a second path is connected to the power input end of the second load and its control circuit, the other end of the first to second loads and their control circuits is grounded, and the remaining paths of the power supply VDD are respectively connected to the power input ends of the third to Nth loads and their control circuits, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the other ends of the third to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power supply VCC is respectively connected to the power input ends of the current data processing module and the control chip to provide working power for them.

[0058] The current sampling module includes a sampling resistor, an AC transformer or a Hall sensor;

[0059] For strong electric loads, current sampling is performed through a sampling resistor. R can be a single resistor or a series resistor or a parallel resistor or the equivalent total resistance of a series-parallel resistor network, or it can be one or a partial resistor in a series resistor or a parallel resistor or a series-parallel resistor network.

[0060] For weak current loads, current sampling is performed through a sampling resistor. R can be a single resistor, a series resistor, a parallel resistor, or the equivalent total resistance of a series-parallel resistor network, or one or a partial resistor in a series resistor, a parallel resistor, or a series-parallel resistor network.

[0061] When the current sampling module uses a sampling resistor, such as Fig. 9 As shown, the sampling resistor includes resistors R1-R3 connected in series. It should be noted that the sampling resistor R can be R1 or R2 or R3, or it can be an equivalent resistor connected in series with R1 and R2, or it can be an equivalent resistor connected in series with R1, R2, and R3. The use of three resistors is just for illustration, and the number of series resistors is not limited.

[0062] like Fig.10 As shown, the sampling resistor includes resistors R1 to R3 connected in parallel. It should be noted that the sampling resistor R can also be an equivalent resistor of resistors R1 and R2 connected in parallel. The use of three resistors is just for illustration, and the number of parallel resistors is not limited.

[0063] like Fig.11 As shown, the sampling resistor includes resistors R1-R6, the resistor R1 is connected to one end of the resistor R5 via the resistor R2, the resistors R3-R4 are connected in parallel with the resistor R2, and the resistor R6 is connected in parallel with the resistor R5. It should be noted that the sampling resistor R can also be an equivalent resistor of a partial resistor combination or an equivalent resistor of the entire resistor network. The use of 6 resistors is only for illustration, and the form of a series-parallel resistor network is not limited.

Claims

1. A household appliance current monitoring device, characterized in that: It includes a current sampling module and a data processing module. The current sampling module is used to collect the total load current and / or partial load current of several household appliances. The data processing module is used to process the total load current and / or partial load current collected by the current sampling module to obtain the total load current and / or partial load current. If it is found that the load working current is in an abnormal state, the load power supply is cut off and an alarm is issued to prompt the user; The monitoring device includes a power supply module, the live wire L is divided into several paths, the first path is connected to the live wire input end of the power supply module, and the remaining paths are respectively connected to the power input ends of the first to Nth loads and their control circuits, the power output end of the power supply module is VCC, the neutral wire is divided into two paths, the first path is connected to the neutral wire input end of the power supply module, the second path is connected to the neutral wire output end of the power supply module, the neutral wire output end of the power supply module is grounded, the other ends of the first load and its control circuit and the second load and its control circuit are grounded, one end of the current sampling module is grounded, and the other end of the current sampling module is divided into several paths, the first path is connected to the signal input end of the current data processing module, and the remaining paths are respectively connected to the current output ends of the third to Nth loads and their control circuits, the signal output end of the current data processing module is connected to the signal input end of the control chip, and the power output end of the power supply module is respectively connected to the power input end of the current data processing module and the control chip to provide working power for them; The current sampling module includes a sampling resistor, an AC transformer or a Hall sensor; when the current sampling module uses a sampling resistor, the sampling resistor includes resistors R1-R3 connected in series; or the sampling resistor includes resistors R1-R3 connected in parallel; or the sampling resistor includes resistors R1-R6, the resistor R1 is connected to one end of the resistor R5 via the resistor R2, the resistors R3-R4 are connected in parallel with the resistor R2, the resistor R6 is connected in parallel with the resistor R5, and N is a natural number greater than 3.

2. A household appliance current monitoring device, characterized in that: It includes a current sampling module and a data processing module. The current sampling module is used to collect the total load current and / or partial load current of several household appliances. The data processing module is used to process the total load current and / or partial load current collected by the current sampling module to obtain the total load current and / or partial load current. If it is found that the load working current is in an abnormal state, the load power supply is cut off and an alarm is issued to prompt the user; The monitoring device includes a current sampling module, the power supply VDD is divided into three paths, the first path is connected to the power input terminal of the first load and its control circuit, the second path is connected to the power input terminal of the second load and its control circuit, the third path is connected to one end of the current sampling module, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input terminal of the current data processing module, and the remaining paths are respectively connected to the power input terminals of the third to Nth loads and their control circuits, the other ends of the first to Nth loads and their control circuits are grounded, the signal output terminal of the current data processing module is connected to the signal input terminal of the control chip, and the power supply VCC is respectively connected to the power input terminals of the current data processing module and the control chip to provide working power for them; The current sampling module includes a sampling resistor, an AC transformer or a Hall sensor; when the current sampling module uses a sampling resistor, the sampling resistor includes resistors R1-R3 connected in series; or the sampling resistor includes resistors R1-R3 connected in parallel; or the sampling resistor includes resistors R1-R6, the resistor R1 is connected to one end of the resistor R5 via the resistor R2, the resistors R3-R4 are connected in parallel with the resistor R2, the resistor R6 is connected in parallel with the resistor R5, and N is a natural number greater than 3.

3. A household appliance current monitoring device, characterized in that: It includes a current sampling module and a data processing module. The current sampling module is used to collect the total load current and / or partial load current of several household appliances. The data processing module is used to process the total load current and / or partial load current collected by the current sampling module to obtain the total load current and / or partial load current. If it is found that the load working current is in an abnormal state, the load power supply is cut off and an alarm is issued to prompt the user; The monitoring device includes a current sampling module, the power supply VDD is divided into several paths, the first path is connected to the power input terminal of the first load and its control circuit, the second path is connected to the power input terminal of the second load and its control circuit, the other end of the first to second loads and their control circuits is grounded, and the remaining paths of the power supply VDD are respectively connected to the power input terminals of the third to Nth loads and their control circuits, the other end of the current sampling module is divided into several paths, the first path is connected to the signal input terminal of the current data processing module, and the remaining paths are respectively connected to the other ends of the third to Nth loads and their control circuits, the signal output terminal of the current data processing module is connected to the signal input terminal of the control chip, and the power supply VCC is respectively connected to the power input terminals of the current data processing module and the control chip to provide working power for them; The current sampling module includes a sampling resistor, an AC transformer or a Hall sensor; when the current sampling module uses a sampling resistor, the sampling resistor includes resistors R1-R3 connected in series; or the sampling resistor includes resistors R1-R3 connected in parallel; or the sampling resistor includes resistors R1-R6, the resistor R1 is connected to one end of the resistor R5 via the resistor R2, the resistors R3-R4 are connected in parallel with the resistor R2, the resistor R6 is connected in parallel with the resistor R5, and N is a natural number greater than 3.

Images