Power measurement circuit and electronic equipment

Abstract

The utility model provides a power measuring circuit and an electronic device. The power measuring circuit comprises a measuring module and a digital processing module. The input end of the measuring module is connected with a power supply module of the electronic equipment; the input end of the digital processing module is connected with the output end of the measuring module, and the output end of the digital processing module is connected with a control module of the electronic equipment. According to the utility model, the power of the electronic equipment can be measured without depending on external power measuring equipment, and the cost of the electronic equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, specifically to a power measurement circuit and electronic equipment. Background Technology

[0002] Electronic devices typically need to monitor their own power during operation in order to adjust the power and avoid waste. Most electronic devices can be connected to external power measurement devices to monitor their own power during operation. However, for small electronic devices such as electronic whiteboards, directly connecting external power measurement devices would occupy a lot of space, thereby increasing the size of the device and increasing costs. Utility Model Content

[0003] This invention provides a power measurement circuit and electronic device, aiming to solve the problem of high cost caused by the need for external power measurement equipment to detect the power of electronic devices.

[0004] In a first aspect, the present invention provides a power measurement circuit, the power measurement circuit comprising a measurement module and a digital processing module; the input terminal of the measurement module is connected to the power supply module of an electronic device; the input terminal of the digital processing module is connected to the output terminal of the measurement module, and the output terminal of the digital processing module is connected to the control module of the electronic device.

[0005] Furthermore, the measurement module includes a current acquisition circuit and a voltage acquisition circuit; the input terminals of the current acquisition circuit and the voltage acquisition circuit are both connected to the power supply module, and the output terminals of the current acquisition circuit and the voltage acquisition circuit are both connected to the digital processing module.

[0006] Furthermore, the current acquisition circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor; one end of the first resistor and one end of the second resistor are both connected to the output terminal of the power supply board of the power supply module, the other end of the first resistor and one end of the third resistor are both connected to the neutral wire of the power supply module, the other end of the second resistor is connected to one end of the first capacitor and the digital processing module, the other end of the third resistor is connected to one end of the second capacitor and the digital processing module, and the other ends of the first capacitor and the second capacitor are both grounded.

[0007] Furthermore, the voltage acquisition circuit includes a plurality of voltage divider resistors connected in series, wherein the first voltage divider resistor is connected to the live wire of the power supply module, and the last voltage divider resistor is connected to the digital processing module.

[0008] Furthermore, the digital processing module includes a first digital processing circuit and an optocoupler isolation circuit; the input terminal of the first digital processing circuit is connected to the output terminal of the current acquisition circuit and the output terminal of the voltage acquisition circuit, respectively; the output terminal of the first digital processing circuit is connected to the input terminal of the optocoupler isolation circuit; and the output terminal of the optocoupler isolation circuit is connected to the control module.

[0009] Furthermore, the optocoupler isolation circuit includes a first optocoupler and a second optocoupler; the optical input terminal of the first optocoupler and the optical output terminal of the second optocoupler are both connected to the first digital processing circuit, and the optical output terminal of the first optocoupler and the optical input terminal of the second optocoupler are both connected to the control module.

[0010] Furthermore, the measurement module includes a current detection circuit and a voltage detection circuit; the input terminal of the current detection circuit and the output terminal of the voltage detection circuit are both connected to the power supply module, and the output terminals of the current detection circuit and the voltage detection circuit are both connected to the digital processing module.

[0011] Furthermore, the current detection circuit includes a current transformer, which is connected to the power supply module and also to the digital processing module.

[0012] Furthermore, the voltage detection circuit includes a voltage transformer, one end of which is connected to the power supply module, and the other end of which is connected to the digital processing module.

[0013] Secondly, this utility model also provides an electronic device, which includes a power supply module, a control module, and the power measurement circuit described in any one of the above-mentioned items.

[0014] The electronic device disclosed in this utility model includes a power supply module and a power measurement circuit. The power measurement circuit includes a measurement module and a digital processing module. The measurement module is connected to both the power supply module and the digital processing module. It can collect and measure the voltage and current of the power supply module and send the collected and measured voltage and current to the digital processing module. After processing, the digital processing module sends the data to the control module of the electronic device, so that the control module can calculate the power based on the voltage and current. Therefore, the power of the electronic device can be measured without relying on external power measurement equipment, which reduces the cost. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a block diagram of the power measurement circuit provided in the first embodiment of the present invention;

[0017] Figure 2 This is a block diagram of the power measurement circuit provided in the second embodiment of the present invention;

[0018] Figure 3 This is a circuit diagram of the current acquisition circuit provided in the first embodiment of this utility model;

[0019] Figure 4 This is a circuit diagram of the voltage acquisition circuit provided in the first embodiment of this utility model;

[0020] Figure 5 This is a circuit diagram of the optocoupler isolation circuit provided in the first embodiment of this utility model;

[0021] Figure 6 This is a block diagram of the power measurement circuit provided in the third embodiment of this utility model;

[0022] Figure 7 This is a circuit diagram of the voltage acquisition circuit provided in the second embodiment of this utility model;

[0023] Figure 8 This is a circuit diagram of the current acquisition circuit provided in the second embodiment of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0027] Furthermore, the directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are only for reference to the accompanying drawings and the product's usage state. Therefore, the directional terms used are for explaining and understanding this invention, and not for limiting it. Additionally, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0028] See Figures 1 to 8 , Figure 1 This is a block diagram of the power measurement circuit 100 provided in the first embodiment of this utility model; Figure 2 This is a block diagram of the power measurement circuit 100 provided in the second embodiment of this utility model; Figure 3 This is a circuit diagram of the current acquisition circuit 11 provided in the first embodiment of this utility model; Figure 4 This is a circuit diagram of the voltage acquisition circuit 12 provided in the first embodiment of this utility model; Figure 5 This is a circuit diagram of the optocoupler isolation circuit 22 provided in the first embodiment of this utility model; Figure 6 This is a block diagram of the power measurement circuit 100 provided in the third embodiment of this utility model; Figure 7 This is a circuit diagram of the voltage acquisition circuit 12 provided in the second embodiment of this utility model; Figure 8 This is a circuit diagram of the current acquisition circuit 11 provided in the second embodiment of this utility model. Figure 1 As shown, the power measurement circuit 100 includes a measurement module 10 and a digital processing module 20; the input terminal of the measurement module 10 is connected to the power supply module 200 of the electronic device; the input terminal of the digital processing module 20 is connected to the output terminal of the measurement module 10, and the output terminal of the digital processing module 20 is connected to the control module 300 of the electronic device.

[0029] Specifically, the electronic device can be any electronic device with a load, such as an electronic whiteboard. The electronic whiteboard may include a load 400, a power supply module 200, a control module 300, and a power measurement circuit 100. The power supply module 200 may include a power board with corresponding power circuitry, and the power board also supplies power to the load 400 of the electronic device. The control module 300 may include a motherboard with corresponding control chips for controlling the operation of the electronic device.

[0030] The power measurement circuit 100 may include a measurement module 10 and a digital processing module 20. The measurement module 10 is connected to the power supply module 200 and is used to detect and measure the voltage and current of the power supply module 200. At the same time, the measurement module 10 is also connected to the digital processing module 20 and is used to send the detected and measured voltage and current to the digital processing module 20. After being processed by the digital processing module 20, the data is output to the control module 300. Finally, the control module 300 calculates the power of the electronic device.

[0031] The measurement module 10 is mainly used to detect the voltage and current of the power supply module 200. Specifically, it can include two different types of measurement methods: isolated detection and non-isolated detection. Figures 2 to 5 The diagram shows a block illustration and circuit diagram for non-isolated measurements. Figures 6 to 8 The block diagram and circuit diagram for isolation measurement are shown below. The two types of detection are explained separately.

[0032] See Figures 2 to 5 As a further embodiment, the measurement module 10 includes a current acquisition circuit 11 and a voltage acquisition circuit 12; the input terminals of the current acquisition circuit 11 and the voltage acquisition circuit 12 are both connected to the power supply module 200, and the output terminals of the current acquisition circuit 11 and the voltage acquisition circuit 12 are both connected to the digital processing module 20.

[0033] In the non-isolated measurement, the measurement module 10 may include a current acquisition circuit 11 and a voltage acquisition circuit 12. Both the current acquisition circuit 11 and the voltage acquisition circuit 12 are connected to the power supply module 200. The current acquisition circuit 11 is used to acquire the current of the power supply module 200, and the voltage acquisition circuit 12 is used to acquire the current of the power supply module 200. At the same time, the voltage acquisition circuit 12 and the current acquisition circuit 11 are also connected to the digital processing module 20 to output the acquired voltage or current to the digital processing module 20, and after processing by the digital processing module 20, the voltage or current is output to the control module 300.

[0034] As a further embodiment, the current acquisition circuit 11 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a second capacitor C2; one end of the first resistor R1 and one end of the second resistor R2 are both connected to the output terminal of the power supply board of the power supply module 200, the other end of the first resistor R1 and one end of the third resistor R3 are both connected to the neutral wire of the power supply module 200, the other end of the second resistor R2 is connected to one end of the first capacitor C1 and the digital processing module 20, the other end of the third resistor R3 is connected to one end of the second capacitor C2 and the digital processing module 20, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are both grounded.

[0035] Among them, such as Figure 3 As shown, AC_N_OUT is the output terminal of the power supply board of the power supply module 200, AC_N is the AC neutral line, the first resistor R1 is connected in parallel with AC_N_OUT and AC_N, the second resistor R2 is connected in series with AC_N_OUT, the third resistor R3 is connected in series with AC_N, the first capacitor C1 and the second capacitor C2 are connected in series, and the series circuit formed by them is connected in parallel with AC_N_OUT and AC_N. IN1 and IP1 are output to the digital processing module 20.

[0036] As a further embodiment, the voltage acquisition circuit 12 includes a plurality of voltage divider resistors connected in series, wherein the first voltage divider resistor is connected to the live wire of the power supply module 200, and the last voltage divider resistor is connected to the digital processing module 20.

[0037] Among them, such as Figure 4 As shown, the voltage acquisition circuit may include resistors RX1, RX2, RX3, RX4 and RX5 connected in series. Resistor RX6 and capacitor C3 are connected in parallel with resistor RX5. AC_L is the AC live wire, and VP is output to the digital processing module 20.

[0038] As a further embodiment, the digital processing module 20 includes a first digital processing circuit 21 and an optocoupler isolation circuit 22; the input terminal of the first digital processing circuit 21 is connected to the output terminal of the current acquisition circuit 11 and the output terminal of the voltage acquisition circuit 12, respectively; the output terminal of the first digital processing circuit 21 is connected to the input terminal of the optocoupler isolation circuit 22; and the output terminal of the optocoupler isolation circuit 22 is connected to the control module 300.

[0039] The digital processing module 20 may include a first digital processing circuit 21 and an optocoupler isolation circuit 22. The first digital processing module 20 may include a digital processing chip and its peripheral circuits. It may also include a power supply circuit to power the digital processing chip. The digital processing chip is connected to the outputs of the voltage acquisition circuit 12 and the current acquisition circuit 11, and processes the voltage and current signals before outputting them to the optocoupler isolation circuit 22, which then outputs the signals to the control module 300. The optocoupler isolation circuit 22 prevents damage to the control module 300 from high voltage or high current.

[0040] As a further embodiment, the optocoupler isolation circuit 22 includes a first optocoupler T1 and a second optocoupler T2; the optical input terminal of the first optocoupler T1 and the optical output terminal of the second optocoupler T2 are both connected to the first digital processing circuit 21, and the optical output terminal of the first optocoupler T1 and the optical input terminal of the second optocoupler T2 are both connected to the control module 300.

[0041] The optocoupler isolation circuit 22 may include a first optocoupler T1 and a second optocoupler T2, such as... Figure 5 As shown, the optical input terminal of the first optocoupler T1 is connected to the TX pin of the digital processing chip in the first digital processing circuit 21 through resistor R5, and the optical output terminal of the first optocoupler T1 is connected to the SOC_RX pin of the control chip in the control module 300.

[0042] The optical output terminal of the second optocoupler T2 is connected to the RX pin of the digital processing chip through resistor R7, and the optical input terminal of the second optocoupler T2 is connected to the SOC_TX pin of the control chip.

[0043] See Figures 6 to 8 As a further embodiment, the measurement module 10 includes a current detection circuit 13 and a voltage detection circuit 14; the input terminal of the current detection circuit 13 and the output terminal of the voltage detection circuit 14 are both connected to the power supply module 200, and the output terminals of the current detection circuit 13 and the voltage detection circuit 14 are both connected to the digital processing module 20.

[0044] In the isolation detection, the measurement module 10 may include a current detection circuit 13 and a voltage detection circuit 14. The input terminals of both the current detection circuit 13 and the voltage detection circuit 14 are connected to the power supply module 200, and the output terminals of both the current detection circuit 13 and the voltage detection circuit 14 are connected to the digital processing module 20. The current detection circuit 13 is used to detect the current of the power supply module 200, and the voltage detection circuit 14 is used to detect the voltage of the power supply module 200, and sends the voltage signal and the current signal to the digital processing module 20.

[0045] In a further embodiment, the current detection circuit 13 includes a current transformer CT1, which is connected to the power supply module 200 and also to the digital processing module 20. In a further embodiment, the voltage detection circuit 14 includes a voltage transformer PT1, one end of which is connected to the power supply module 200, and the other end of which is connected to the digital processing module 20.

[0046] Among them, such as Figure 7 As shown, the voltage detection circuit 14 includes a voltage transformer PT1. One end of the voltage transformer PT1 is connected to the N_OUT terminal of the power supply board through resistors R13, R12, R110, R9, and R11. Simultaneously, this end of the voltage transformer PT1 is also connected to the L_OUT terminal of the power supply board. The other end of the voltage transformer PT1 is connected to the VP pin of the digital processing chip in the digital processing module 20 through resistor R15.

[0047] like Figure 8 As shown, the current detection circuit 13 includes a current transformer CT1, which is connected to the AC_N_OUT terminal and AC_N terminal of the power supply board, respectively. At the same time, the current transformer CT1 is also connected to the IP1 pin and IN1 pin of the digital processing chip through resistors R17 and R18, respectively.

[0048] This utility model also provides an electronic device, which includes a power supply module 200, a control module 300, and a power measurement circuit 100 as described in any of the above embodiments; the power measurement circuit 100 includes a measurement module 10 and a digital processing module 20; the input terminal of the measurement module 10 is connected to the power supply module 200 of the electronic device; the input terminal of the digital processing module 20 is connected to the output terminal of the measurement module 10, and the output terminal of the digital processing module 20 is connected to the control module 300 of the electronic device.

[0049] Specifically, the electronic device may include a power supply module 200, a control module 300, and a power measurement circuit 100. The power supply module 200 may include a power board with corresponding power circuitry, and the power board is also used to supply power to the load 400 of the electronic device. The control module 300 may include a motherboard with corresponding control chips for controlling the operation of the electronic device.

[0050] The power measurement circuit 100 may include a measurement module 10 and a digital processing module 20. The measurement module 10 is connected to the power supply module 200 and is used to detect and measure the voltage and current of the power supply module 200. At the same time, the measurement module 10 is also connected to the digital processing module 20 and is used to send the detected and measured voltage and current to the digital processing module 20. After being processed by the digital processing module 20, the data is output to the control module 300. Finally, the control module 300 calculates the power of the electronic device.

[0051] The measurement module 10 is mainly used to detect the voltage and current of the power supply module 200. Specifically, it can include two different types of measurement methods: isolated detection and non-isolated detection. Figures 2 to 5 The diagram shows a block illustration and circuit diagram for non-isolated measurements. Figures 6 to 8 A block diagram and circuit diagram for isolation measurement.

[0052] The power measurement circuit and electronic device disclosed in this utility model have a measurement module connected to a power supply module and a digital processing module, respectively. The measurement module can collect and measure the voltage and current of the power supply module and send the collected and measured voltage and current to the digital processing module. After processing by the digital processing module, the data is sent to the control module of the electronic device, so that the control module can calculate the power based on the voltage and current. Thus, the power of the electronic device can be measured without relying on external power measurement equipment, which reduces the cost.

[0053] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A power measurement circuit, characterized by, The power measurement circuit comprises: a measurement module, an input end of the measurement module being connected with a power supply module of an electronic device; a digital processing module, an input end of the digital processing module being connected with an output end of the measurement module, and an output end of the digital processing module being connected with a control module of the electronic device.

2. The power measurement circuit of claim 1, wherein, The measurement module comprises a current acquisition circuit and a voltage acquisition circuit; an input end of the current acquisition circuit and an input end of the voltage acquisition circuit are both connected with the power supply module, and an output end of the current acquisition circuit and an output end of the voltage acquisition circuit are both connected with the digital processing module.

3. The power measurement circuit of claim 2, wherein, The current acquisition circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor; one end of the first resistor and one end of the second resistor are both connected with an output end of a power board of the power supply module, the other end of the first resistor and one end of the third resistor are both connected with a zero line of the power supply module, the other end of the second resistor is connected with one end of the first capacitor and the digital processing module respectively, the other end of the third resistor is connected with one end of the second capacitor and the digital processing module respectively, and the other end of the first capacitor and the other end of the second capacitor are both grounded.

4. The power measurement circuit of claim 2, wherein, The voltage acquisition circuit comprises a plurality of voltage division resistors connected in series, a first voltage division resistor of the plurality of voltage division resistors is connected with a live line of the power supply module, and a last voltage division resistor of the plurality of voltage division resistors is connected with the digital processing module.

5. The power measurement circuit of claim 2, wherein, The digital processing module comprises a first digital processing circuit and an optical coupling isolation circuit; an input end of the first digital processing circuit is connected with an output end of the current acquisition circuit and an output end of the voltage acquisition circuit respectively, an output end of the first digital processing circuit is connected with an input end of the optical coupling isolation circuit, and an output end of the optical coupling isolation circuit is connected with the control module.

6. The power measurement circuit of claim 5, wherein, The optical coupling isolation circuit comprises a first optoelectronic coupler and a second optoelectronic coupler; an optical input end of the first optoelectronic coupler and an optical output end of the second optoelectronic coupler are both connected with the first digital processing circuit, and an optical output end of the first optoelectronic coupler and an optical input end of the second optoelectronic coupler are both connected with the control module.

7. The power measurement circuit of claim 1, wherein, The measurement module comprises a current detection circuit and a voltage detection circuit; an input end of the current detection circuit and an output end of the voltage detection circuit are both connected with the power supply module, and an output end of the current detection circuit and an output end of the voltage detection circuit are both connected with the digital processing module.

8. The power measurement circuit of claim 7, wherein, The current detection circuit comprises a current transformer, the current transformer being connected with the power supply module and the digital processing module.

9. The power measurement circuit of claim 7, wherein, The voltage detection circuit comprises a voltage transformer, one end of the voltage transformer being connected with the power supply module, and the other end of the voltage transformer being connected with the digital processing module.

10. An electronic device, comprising: The power measurement circuit comprises a power supply module, a control module and the power measurement circuit according to any one of claims 1-9.

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