A load adaptive circuit for IoT meter

Abstract

The present application provides an Internet of Things meter load adaptive circuit, which includes: a power output module, a load judgment subcircuit and a dummy load control subcircuit; the power output module is connected to the load judgment subcircuit and the dummy load control subcircuit; the load judgment subcircuit is connected to the dummy load control subcircuit; the load judgment subcircuit is used to judge whether the circuit has a load according to the input level of the load judgment subcircuit; the dummy load control subcircuit is used to connect the circuit when the circuit does not have a load. The Internet of Things meter load adaptive circuit provided by the embodiment of the present application can reduce the power consumption of the Internet of Things meter while stabilizing the output voltage of the Internet of Things meter.

Description

Technical Field

[0001] The present application relates to the field of Internet of Things electric energy meters, and more specifically, to an Internet of Things meter load adaptive circuit. Background Art

[0002] The power supply of IoT electric energy meters generally adopts a flyback switching power supply, which generally has two power outputs; one for the management chip and the other for the metering chip. Since the working current of the management chip is relatively large, in order to obtain more stable power output and work efficiency, the power output of the management chip is often used as a feedback loop.

[0003] However, the management core module is not a necessary module for the IoT electricity meter. When the IoT electricity meter does not have a management core module, the load of the power feedback loop is very low; at this time, the second power supply cannot output stable power.

[0004] At present, in order to ensure the stable output of the second power supply without the management chip in the first power supply, a dummy load is often added to the first power supply to stabilize the output voltage of the other power supply. However, the addition of the dummy load will increase the power consumption of the IoT power meter. Utility Model Content

[0005] In view of the above problems, the purpose of the embodiment of the present application is to provide an Internet of Things meter load adaptive circuit, which can determine whether a circuit has a load connected by setting a load judgment subcircuit and a dummy load control subcircuit; when the circuit has a first load connected, the dummy load control subcircuit controls the dummy load not to be connected; when the circuit does not have a first load connected, the dummy load control subcircuit controls the dummy load to connect to the circuit. This can not only maintain the output voltage of the power supply stable, but also reduce the power consumption of the Internet of Things meter.

[0006] In a first aspect, an embodiment of the present application provides an Internet of Things meter load adaptive circuit, which includes: a power output module, a load judgment subcircuit and a dummy load control subcircuit; the power output module is connected to the load judgment subcircuit and the dummy load control subcircuit; the load judgment subcircuit is connected to the dummy load control subcircuit; the load judgment subcircuit is used to judge whether the circuit has a first load according to the input level of the load judgment subcircuit; the dummy load control subcircuit is used to connect the circuit when the circuit does not have the first load.

[0007] In the above implementation process, the load judgment subcircuit is set to determine whether the IoT electric meter is connected to the first load. When the first load is connected to the circuit, the dummy load control subcircuit controls the dummy load not to be connected to the circuit; thereby reducing the power consumption of the IoT electric energy meter. When the first load is not connected to the circuit, the dummy load control subcircuit controls the dummy load to be connected to the circuit, thereby maintaining a stable output voltage of the power supply.

[0008] Optionally, in an embodiment of the present application, the load judgment subcircuit includes: a first voltage-dividing resistor, a first protection resistor, and a first switch. The first end of the first voltage-dividing resistor is the first end of the load judgment subcircuit; the second end of the first voltage-dividing resistor is connected to the first end of the first switch; the first voltage-dividing resistor is used to control the current of the load judgment subcircuit when the first end of the load judgment subcircuit is connected to the first load; the third end of the first switch is connected to the dummy load control subcircuit; the first switch is used to turn on when the first end of the load judgment subcircuit is connected to the first load, and output a low level at the third end of the first switch; the first switch is also used to turn off when the first end of the load judgment subcircuit is suspended, and output a high level at the third end of the first switch.

[0009] In the above implementation process, a first switch and a matching resistor are set in the load judgment subcircuit. When the circuit is connected to the load, the first switch is turned on; after the first switch is turned on, since the second switch of the first switch is grounded, the potential of the second end of the first switch is low. If the circuit is not connected to the load, the first switch is in the cut-off state; since the first voltage-dividing resistor is connected to the power output module, the third end of the first switch is connected to the first voltage-dividing resistor, then the third end of the first switch outputs a high level. Through the load judgment subcircuit provided in the embodiment of the present application, it is possible to accurately judge whether the circuit has a load connected, thereby further determining whether the dummy load needs to be connected.

[0010] Optionally, in an embodiment of the present application, the load judgment subcircuit also includes: a first filtering module and a second filtering module; the first end of the first filtering module is connected to the second end of the first voltage-dividing resistor, the first end of the first switch, and the second end of the first switch; the first end of the second filtering module is connected to the third end of the first switch; the second end of the second filtering module is connected to the second end of the first switch, the second end of the first filtering module and the ground.

[0011] In the above implementation process, there are also a first filtering module and a second filtering module in the dummy load judgment subcircuit; when the load is connected to or removed from the circuit, the voltage of the circuit will be affected; therefore, filtering modules are respectively set at the input and output ends of the load judgment subcircuit to improve the anti-interference ability of the circuit.

[0012] Optionally, in an embodiment of the present application, the dummy load control subcircuit includes: a second protection resistor, a third protection resistor, a second switch and a dummy load; the second protection resistor is connected to the load judgment subcircuit, the third protection resistor, the second end of the dummy load and the power output module; the third protection resistor is connected to the first end of the second switch; the second end of the second switch is grounded; the third end of the second switch is connected to the first end of the dummy load; the second switch is used to connect the dummy load to the circuit when the second switch is turned on; and the second end of the dummy load is connected to the power output module; the dummy load is used to keep the output voltage of the power output module stable.

[0013] In the above implementation process, in the dummy load judgment subcircuit provided in the embodiment of the present application, the second switch and the matching resistor are set to control whether the dummy load is connected to the circuit. When the load is connected to the circuit, the input end of the dummy load control subcircuit will input a low level, then the second switch is in a disconnected state, and the dummy load will not be connected to the circuit. When the dummy load is not connected to the circuit, the second switch is in a conducting state, and the dummy load is connected to the circuit. Thereby, when there is a load in the circuit, the dummy load is not connected, which reduces the power consumption of the circuit; when there is no load in the circuit, the dummy load is connected to keep the output of the power supply stable.

[0014] Optionally, in an embodiment of the present application, the load adaptive circuit of the IoT meter further includes a voltage feedback subcircuit and a power supply. The power supply voltage output module includes a first output subcircuit and a second output submodule; the voltage feedback subcircuit is connected to the power supply and the first output submodule, and is used to stabilize the output voltage of the power supply; the first output submodule is connected to the dummy load control subcircuit and the load judgment subcircuit, and is used to supply power to the first load when the first end of the load judgment subcircuit is connected to the first load; the second output submodule is connected to the second load, and is used to supply power to the second load.

[0015] In the above implementation process, the output of the general electric energy meter can be divided into two paths; one path can be connected or not connected to the load, and the other path generally always has a load; in the embodiment of the present application, the load that is always connected to the load is called the second load, and is connected to the second output submodule; the other path that can be connected or not connected to the load is called the first load, and is connected to the first output submodule. In the embodiment of the present application, the output voltage of the first output submodule is used as the feedback signal of the voltage feedback submodule of the embodiment of the present application. Through the correction of the voltage by the voltage feedback submodule, the output voltage of the second output submodule can be kept stable.

[0016] Optionally, in an embodiment of the present application, the voltage feedback subcircuit includes an error sampling module, a voltage regulating module, and a photoelectric coupler. The error sampling module is connected to the first output submodule and the ground, and is used to obtain the output voltage of the first output submodule to obtain the target voltage; the first end of the voltage regulating module is connected to the error sampling module and the first output submodule; the second end of the voltage regulating module is grounded; the voltage regulating module is used to correct the target voltage; the photoelectric coupler is connected to the voltage regulating module and the power supply, and is used to correct the output voltage of the first output submodule.

[0017] In the above implementation process, the voltage feedback subcircuit in the embodiment of the present application is respectively provided with an error sampling module, a voltage regulation module and a photoelectric coupler; and the functions of voltage sampling, voltage regulation and voltage feedback are respectively realized. Regardless of whether the first output submodule is connected to the first load, the output voltage can be adjusted through the load feedback subcircuit to keep the output voltage of the second output submodule stable.

[0018] Optionally, in an embodiment of the present application, the voltage feedback subcircuit also includes: a balancing module; the error sampling module includes: a first sampling resistor and a second sampling resistor; the first end of the balancing module is connected to the first sampling resistor and the second sampling resistor; the second end of the balancing module is connected to the voltage regulation module; the balancing module is used to maintain loop stability when the voltage regulation module corrects the target voltage.

[0019] In the above implementation process, a balancing module is also provided in the voltage feedback submodule. The balancing module determines whether the output voltage of the first output module is higher or lower than the reference voltage according to the voltage sampling by the first sampling resistor and the second sampling resistor in the error sampling module, thereby correcting the voltage and maintaining the stability of the loop.

[0020] Optionally, in an embodiment of the present application, the voltage regulation module includes a reference source; the reference source is connected in parallel with the first sampling resistor; the first end of the reference source is connected to the photocoupler, and the reference source is used to correct the target voltage.

[0021] In the above implementation process, a reference source is provided in the voltage regulation module, which can stably output a standard voltage, pull a target voltage that is too high or too low back to the standard voltage, and further feed the standard voltage back to the power supply through a photocoupler to pull the output voltage of the power supply back to the standard voltage.

[0022] Optionally, in an embodiment of the present application, the first load includes a management core module.

[0023] Optionally, in the embodiment of the present application, the second load includes a metering core module.

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A first schematic diagram of a load adaptive circuit for an IoT meter provided in an embodiment of the present application;

[0027] Figure 2 A circuit diagram of a load determination subcircuit provided in an embodiment of the present application;

[0028] Figure 3 A circuit diagram of a dummy load control subcircuit provided in an embodiment of the present application;

[0029] Figure 4 A second schematic diagram of a load adaptive circuit for an IoT meter provided in an embodiment of the present application;

[0030] Figure 5 A circuit diagram of a voltage feedback subcircuit provided in an embodiment of the present application.

[0031] Icons: power output module-200; dummy load control subcircuit-400; load judgment subcircuit-300; first voltage-dividing resistor-R2; first protection resistor-R1; first switch-Q1; first filtering module-310; second filtering module-320; second protection resistor-R3; third protection resistor-R4; second switch-Q2; dummy load-R; first load-R8; second load-R9; voltage feedback subcircuit-500; first output submodule-210; second output submodule-220; error sampling module-510; voltage regulation module-520; optocoupler-U1; balancing module-530; first sampling resistor-R5; second sampling resistor-R6; reference source-U2. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] During the research process, the applicant discovered that the flyback switching power supply generally has two power outputs; one of which supplies power to the management chip, and the other supplies power to the metering chip. Since the working current of the management chip is relatively large, in order to obtain more stable power output and work efficiency, the power output of the management chip is often used as a feedback loop. However, the management chip module is not a necessary module for the Internet of Things electric energy meter. When the Internet of Things electric energy meter does not have a management chip module, the load of the power feedback loop is very low; at this time, the second power supply cannot output stable power. In order to ensure the stable output of the second power supply under the premise that there is no management chip on the first channel, a dummy load is often added to the first channel to stabilize the output voltage of the other channel. However, the addition of the dummy load will cause the power consumption of the Internet of Things electric energy meter to increase when the management chip module is not connected.

[0039] Based on this, the load adaptive circuit of the IoT meter provided in the embodiment of the present application can judge whether there is a load connected to the circuit by setting a load judgment subcircuit and a dummy load control subcircuit; when there is a load connected to the circuit, the dummy load control subcircuit controls the dummy load not to be connected; when there is no load connected to the circuit, the dummy load control subcircuit controls the dummy load to be connected to the circuit. In this way, the output voltage of the power supply can be kept stable, and the power consumption of the IoT meter can be reduced.

[0040] Please see Figure 1 , Figure 1 The first schematic diagram of the load adaptive circuit of the Internet of Things meter provided in the embodiment of the present application. The load adaptive circuit 100 of the Internet of Things meter includes a power output module 200, a load judgment subcircuit 300 and a dummy load control subcircuit 400.

[0041] The power output module 200 is connected to the load judgment subcircuit 300 and the dummy load control subcircuit 400; the load judgment subcircuit 300 is connected to the dummy load control subcircuit; the load judgment subcircuit 300 is used to judge whether the circuit has a first load R8 according to the input level of the load judgment subcircuit 300; the dummy load R control circuit is used to connect the circuit when the first load R8 does not exist in the circuit.

[0042] pass Figure 1 It can be seen that the IoT meter load adaptive circuit 100 provided in the embodiment of the present application realizes the judgment of whether the IoT meter is connected to the first load R8 by setting the load judgment subcircuit 300. When the first load R8 is connected to the circuit, the dummy load control subcircuit 400 controls the dummy load R not to be connected to the circuit; thereby reducing the power consumption of the IoT meter. When the first load R8 is not connected to the circuit, the dummy load control subcircuit 400 controls the dummy load R to be connected to the circuit, thereby maintaining the output voltage of the power supply stable.

[0043] Please see Figure 2 , Figure 2A circuit diagram of a load determination subcircuit provided in an embodiment of the present application; the load determination subcircuit 300 includes a first voltage-dividing resistor R2, a first protection resistor R1, and a first switch Q1.

[0044] The first end of the first voltage-dividing resistor R2 is the first end of the load judgment subcircuit; the second end of the first voltage-dividing resistor R2 is connected to the first end of the first switch Q1; the first voltage-dividing resistor R2 is used to control the current of the load judgment subcircuit 300 when the first end of the load judgment subcircuit is connected to the first load R8; the third end of the first switch Q1 is connected to the dummy load control subcircuit 400; the first switch Q1 is used to be turned on when the first end of the load judgment subcircuit is connected to the first load R8, and output a low level at the third end of the first switch Q1; the first switch Q1 is also used to be turned off when the first end of the load judgment subcircuit is suspended, and output a high level at the third end of the first switch Q1.

[0045] It can be understood by those skilled in the art that the first switch Q1 can be an NPN transistor; wherein the first end of the first switch Q1 is the base of the transistor, the second end of the first switch Q1 is the emitter of the transistor, and the third end of the first switch Q1 is the collector of the transistor. Since the second end of the first switch Q1 is grounded, when the first switch Q1 is in the on state, the collector of the first switch Q1 outputs a low level. Since the emitter of the first switch Q1 is connected to VCC1 (power output module 200), when the first switch Q1 is in the off state, the collector of the first switch Q1 should output a high level.

[0046] Among them, R1 is arranged between the first switch Q1 and VCC1. When the first switch Q1 is in the on state, the collector of the first switch Q1 is at a low level. Therefore, the first protection resistor R1 is arranged to protect the power supply.

[0047] pass Figure 2 It can be seen that the first switch Q1 and the matching resistor are set in the load judgment subcircuit 300. When the circuit is connected to the load, the first switch Q1 is turned on; after the first switch Q1 is turned on, since the second switch of the first switch Q1 is grounded, the potential of the second end of the first switch Q1 is low. If the circuit is not connected to the load, the first switch Q1 is in the cut-off state; since the first voltage-dividing resistor R2 is connected to the power output module 200, and the third end of the first switch is connected to the first voltage-dividing resistor R2, the third end of the first switch Q1 outputs a high level at this time. The load judgment subcircuit provided in the embodiment of the present application can accurately determine whether the circuit has a load connected, thereby further determining whether the dummy load R needs to be connected.

[0048] Please continue to see Figure 2 The load judgment subcircuit 300 also includes: a first filtering module 310 and a second filtering module 320 .

[0049] The first end of the first filter module 310 is connected to the second end of the first voltage-dividing resistor R2, the first end of the first switch Q1, and the second end of the first switch Q1; the first end of the second filter module 320 is connected to the third end of the first switch Q1; the second end of the second filter module 320 is connected to the second end of the first switch Q1, the second end of the first filter module 310, and the ground.

[0050] It can be seen that there are also a first filter module 310 and a second filter module 320 in the fake load judgment subcircuit 300; when the load is connected to or removed from the circuit, the voltage of the circuit will be affected; therefore, filter modules are respectively set at the input and output ends of the load judgment subcircuit 300 to improve the anti-interference ability of the circuit.

[0051] Please see Figure 3 , Figure 3 A circuit diagram of a dummy load control subcircuit provided in an embodiment of the present application; the dummy load control subcircuit 400 includes: a second protection resistor R3, a third protection resistor R4, a second switch Q2 and a dummy load R.

[0052] The second protection resistor R3 is connected to the load judgment sub-circuit 300, the third protection resistor R4, the second end of the dummy load R and the power output module 200; the third protection resistor R4 is connected to the first end of the second switch Q2; the second end of the second switch Q2 is grounded; the third end of the second switch Q2 is connected to the first end of the dummy load R; the second switch Q2 is used to connect the dummy load R to the circuit when the second switch Q2 is turned on; and the second end of the dummy load R is connected to the power output module 200; the dummy load R is used to keep the output voltage of the power output module 200 stable.

[0053] It should be noted that the second switch Q2 can be an NPN transistor; wherein the first end of the second switch Q2 is the base of the transistor, the second end of the second switch Q2 is the emitter of the transistor, and the third end of the second switch Q2 is the collector of the transistor. The input end of the dummy load control subcircuit 400 is connected to the load judgment subcircuit 300; when the collector of the first switch Q1 is at a low level, the second switch Q2 is in a cut-off state, and the dummy load R is equivalent to an open circuit. When the collector of the first switch Q1 is at a high level, the second switch Q2 is in a conducting state, and the dummy load R is connected to the circuit.

[0054] pass Figure 3It can be seen that in the dummy load judgment subcircuit 300 provided in the embodiment of the present application, the second switch Q2 and the matching resistor are set to control whether the dummy load R is connected to the circuit. When the load is connected to the circuit, the input end of the dummy load R control circuit will input a low level, then the second switch Q2 is in a disconnected state, and the dummy load R will not be connected to the circuit. When the dummy load R is not connected to the circuit, the second switch Q2 is in a conducting state, and the dummy load R is connected to the circuit. Thereby, when there is a load in the circuit, the dummy load R is not connected, thereby reducing the power consumption of the circuit; when there is no load in the circuit, the dummy load R is connected to maintain the output of the power supply stable.

[0055] Please see Figure 4 , Figure 4 This is a second schematic diagram of the IoT meter load adaptive circuit provided in an embodiment of the present application; the IoT meter load adaptive circuit 100 also includes a voltage feedback subcircuit 500 and a power supply.

[0056] The power supply voltage output module includes a first output submodule 210 and a second output submodule 220; the voltage feedback subcircuit 500 is connected to the power supply and the first output submodule 210, and is used to stabilize the output voltage of the power supply; the first output submodule 210 is connected to the dummy load control subcircuit 400 and the load judgment subcircuit 300, and is used to supply power to the first load R8 when the first end of the load judgment subcircuit is connected to the first load R8; the second output submodule 220 is connected to the second load R9, and is used to supply power to the second load R9.

[0057] pass Figure 4 It can be known that the output of a general electric energy meter can be divided into two paths; one path may or may not be connected to a load, and the other path generally always has a load; in the embodiment of the present application, the path of load that is always connected to the load is called the second load R9, and is connected to the second output submodule 220; the other path of load that may or may not be connected is called the first load R8, and is connected to the first output submodule 210. In the embodiment of the present application, the output voltage of the first output submodule 210 is used as the feedback signal of the voltage feedback submodule of the embodiment of the present application. Through the correction of the voltage by the voltage feedback submodule, the output voltage of the second output submodule 220 can be kept stable.

[0058] Please see Figure 5 , Figure 5 This is a circuit diagram of a voltage feedback sub-circuit provided in an embodiment of the present application; the voltage feedback sub-circuit 500 includes an error sampling module 510, a voltage regulation module 520 and a photoelectric coupler U1.

[0059] Those skilled in the art can understand that a photocoupler is an electrical-optical-electrical conversion device that uses light as a medium to transmit electrical signals. It consists of two parts: a light source and a light receiver. The light source and the light receiver are assembled in the same sealed housing and isolated from each other by a transparent insulator. Since the input and output of the photocoupler are isolated from each other, the electrical signal transmission has the characteristics of unidirectionality, and thus has good electrical insulation and anti-interference capabilities.

[0060] The error sampling module 510 is connected to the first output submodule 210 and the ground, and is used to obtain the output voltage of the first output submodule 210 to obtain the target voltage; the first end of the voltage regulating module 520 is connected to the error sampling module 510 and the first output submodule 210; the second end of the voltage regulating module 520 is grounded; the voltage regulating module 520 is used to correct the target voltage; the optocoupler U1 is connected to the voltage regulating module 520 and the power supply, and is used to correct the output voltage of the first output submodule 210.

[0061] pass Figure 5 It can be seen that the voltage feedback subcircuit 500 in the embodiment of the present application is respectively provided with an error sampling module 510, a voltage regulation module 520 and a photoelectric coupler U1; the functions of voltage sampling, voltage regulation and voltage feedback are respectively realized. Regardless of whether the first output submodule 210 is connected to the first load R8, the output voltage can be adjusted through the load feedback subcircuit to keep the output voltage of the second output submodule 220 stable.

[0062] Please continue to see Figure 5 The voltage feedback sub-circuit 500 further includes: a balancing module 530. The error sampling module 510 includes: a first sampling resistor R5 and a second sampling resistor R6.

[0063] The first end of the balancing module 530 is connected to the first sampling resistor R5 and the second sampling resistor R6; the second end of the balancing module 530 is connected to the voltage regulating module 520; the balancing module 530 is used to keep the loop stable when the voltage regulating module 520 corrects the target voltage.

[0064] It can be seen that a balancing module 530 is also provided in the voltage feedback submodule. The balancing module 530 determines whether the output voltage of the first output module is higher or lower than the reference voltage according to the voltage sampling by the first sampling resistor R5 and the second sampling resistor R6 in the error sampling module 510, thereby correcting the voltage and maintaining the stability of the loop.

[0065] Please continue to see Figure 5 , the voltage regulation module 520 includes a reference source U2.

[0066] The reference source U2 is connected in parallel with the first sampling resistor R5 ; the first end of the reference source U2 is connected with the photoelectric coupler U1 , and the reference source U2 is used to correct the target voltage.

[0067] It should be noted that the reference source provides a stable and standard voltage source. The output voltage value can be controlled by taking the voltage of the reference source as a reference.

[0068] It can be seen that the voltage regulation module 520 is provided with a reference source U2, which can stably output a standard voltage, pull a target voltage that is too high or too low back to the standard voltage, and further feed the standard voltage back to the power supply through the optocoupler U1, pulling the output voltage of the power supply back to the standard voltage.

[0069] In an optional embodiment, the first load R8 includes a power management core module. The power management core module is generally used to manage the conversion, distribution, detection and other power management of electric energy in an electronic device system.

[0070] In an optional embodiment, the second load R9 includes a metering core module. The metering core module is often used to convert electrical signals into data that can be read by a single chip microcomputer, and then the single chip microcomputer performs calculations to achieve electrical energy metering.

[0071] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A load adaptive circuit for an IoT meter, characterized in that: The load adaptive circuit of the IoT meter includes: a power output module, a load judgment subcircuit and a dummy load control subcircuit; The power output module is connected to the load judgment subcircuit and the dummy load control subcircuit; The load judgment subcircuit is connected to the dummy load control subcircuit; The load determination subcircuit is used to determine whether the circuit has a first load according to the input level of the load determination subcircuit; and the dummy load control subcircuit is used to connect the circuit when the circuit does not have the first load.

2. The load adaptive circuit of the IoT meter according to claim 1, characterized in that: The load judgment subcircuit includes: a first voltage dividing resistor, a first protection resistor and a first switch; The first end of the first voltage-dividing resistor is the first end of the load judgment subcircuit; the second end of the first voltage-dividing resistor is connected to the first end of the first switch; The first voltage-dividing resistor is used to control the current of the load judgment subcircuit when the first end of the load judgment subcircuit is connected to the first load; The second end of the first switch is grounded; the third end of the first switch is connected to the dummy load control subcircuit; the first switch is used to be turned on when the first end of the load judgment subcircuit is connected to the first load, and to output a low level at the third end of the first switch; the first switch is also used to be turned off when the first end of the load judgment subcircuit is suspended, and to output a high level at the third end of the first switch.

3. The load adaptive circuit of the IoT meter according to claim 2, characterized in that: The load judgment subcircuit further includes: a first filtering module and a second filtering module; The first end of the first filtering module is connected to the second end of the first voltage-dividing resistor, the first end of the first switch, and the second end of the first switch; The first end of the second filtering module is connected to the third end of the first switch; The second end of the second filter module is connected to the second end of the first switch, the second end of the first filter module and the ground.

4. The load adaptive circuit of the IoT meter according to claim 1, characterized in that: The dummy load control subcircuit comprises: a second protection resistor, a third protection resistor, a second switch and a dummy load; The second protection resistor is connected to the load judgment sub-circuit, the third protection resistor, the second end of the dummy load and the power output module; The third protection resistor is connected to the first end of the second switch; The second end of the second switch is grounded; the third end of the second switch is connected to the first end of the dummy load; the second switch is used to connect the dummy load to the circuit when the second switch is turned on; and The second end of the dummy load is connected to the power output module; the dummy load is used to keep the output voltage of the power output module stable.

5. The load adaptive circuit of the IoT meter according to claim 2, characterized in that: The IoT meter load adaptive circuit also includes: a voltage feedback subcircuit and a power supply; the power supply voltage output module includes a first output submodule and a second output submodule; The voltage feedback subcircuit is connected to the power supply and the first output submodule, and is used to stabilize the output voltage of the power supply; The first output submodule is connected to the dummy load control subcircuit and the load judgment subcircuit, and is used to supply power to the first load when the first end of the load judgment subcircuit is connected to the first load; The second output submodule is connected to a second load and is used to supply power to the second load.

6. The load adaptive circuit of the IoT meter according to claim 5, characterized in that: The voltage feedback subcircuit includes: an error sampling module, a voltage regulation module and a photoelectric coupler; The error sampling module is connected to the first output submodule and the ground, and is used to obtain the output voltage of the first output submodule to obtain a target voltage; The first end of the voltage regulating module is connected to the error sampling module and the first output submodule; the voltage regulating module is used to correct the target voltage; The photoelectric coupler is connected to the voltage regulating module and the power supply, and is used to correct the output voltage of the first output submodule.

7. The load adaptive circuit of the IoT meter according to claim 6, characterized in that: The voltage feedback subcircuit further includes: a balancing module; the error sampling module includes: a first sampling resistor and a second sampling resistor; The first end of the balancing module is connected to the first sampling resistor and the second sampling resistor; the second end of the balancing module is connected to the voltage regulating module; the balancing module is used to keep the loop stable when the voltage regulating module corrects the target voltage.

8. The load adaptive circuit of the IoT meter according to claim 7, characterized in that: The voltage regulation module includes a reference source; The reference source is connected in parallel with the first sampling resistor; a first end of the reference source is connected with the photoelectric coupler, and the reference source is used to correct the target voltage.

9. The load adaptive circuit of the IoT meter according to any one of claims 5 to 8, characterized in that: The first load includes a management core module.

10. The load adaptive circuit of the IoT meter according to any one of claims 5 to 8, characterized in that: The second load includes a metering core module.

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