Power management module

Abstract

The utility model relates to a power supply management module which comprises a power supply, a DC-DC voltage reduction chip, a first linear voltage stabilization chip, a second linear voltage stabilization chip, a multipath linear voltage stabilization chip and a voltage reference chip, the output of the power supply is connected with the input of the DC-DC voltage reduction chip, the output of the DC-DC voltage reduction chip is divided into two paths, one path is connected with the input of the first linear voltage-stabilizing chip, one path is connected with the input of the second linear voltage-stabilizing chip, the output of the first linear voltage-stabilizing chip is connected with the digital synthesizer, the output of the second linear voltage-stabilizing chip is divided into three paths, one path is connected with the radio frequency detector, the other path is connected with the input of the multi-path linear voltage-stabilizing chip, and the third path is connected with the input of the voltage reference chip. The output of the multipath linear voltage stabilization chip is divided into multiple paths to be connected with the main control chip, and the output of the voltage reference chip is connected with the analog-to-digital sampling chip. The power supply management module is low in voltage reduction power consumption, low in ripple voltage, low in voltage noise and stable in power supply, so that normal work of the power equipment state monitoring device is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of power equipment status monitoring, and in particular relates to a power management module. Background Art

[0002] In the process of manufacturing, transportation, installation, maintenance and operation of power equipment, it is inevitable that some internal defects will occur. If these internal defects are not discovered and handled in time, they may cause long-term stable partial discharge, causing the internal insulation of the power to gradually deteriorate, thus leading to accidents. Once a power equipment fails, it may cause power outages in local areas, and in severe cases, it may even cause large-scale paralysis of the power grid, causing significant losses to the national economy. Therefore, it is necessary to use online monitoring devices to detect and diagnose partial discharge of power equipment, and then formulate corresponding treatment measures based on the diagnosis results to ensure the safe and stable operation of power equipment and power systems.

[0003] The power supply of the existing power equipment status monitoring device has problems such as high output ripple voltage, large voltage noise, and poor voltage regulation rate. When supplying power to the main control chip and the analog chip, it seriously affects the accuracy of the relevant analog data measurement and the accuracy of the power equipment fault detection. The DC / DC chip used in the power supply of the existing monitoring device during voltage reduction has the problems of high power consumption and low efficiency, resulting in serious heating during the voltage reduction process. Patent CN107807585A discloses a power equipment monitoring system, which includes: a DC / DC adaptive power supply module, an environmental data acquisition module, a data detection module, a central control module, a wireless communication module, an electric memory module, a current control module, a power distribution protection module, an overload protection module, and a module alarm module. The DC / DC adaptive power supply module, the environmental data acquisition module, and the data detection module are respectively connected to the central control module through circuit lines. The control setting of the present invention is simple and the adjustment is convenient; the control paths are multiple and the safety and stability are strong; the remote network control is realized through the wireless communication module; at the same time, the climate conditions around the power equipment can be monitored through the environmental data acquisition module. If the climate changes greatly, preparations can be made in advance for possible problems to prevent losses caused by untimely response once problems occur. Patent CN106323456A discloses a power rectifier circuit and device for a sustainable safety monitoring system for electric power equipment, wherein the power rectifier circuit for a sustainable safety monitoring system for electric power equipment includes a circuit breaker F1, a rectifier module DB1, a power converter T1 and a PWM chip IC4, the live wire terminal A of the power rectifier circuit is connected to the circuit breaker F1, the neutral wire terminal N is connected to the thermistor RT1, the live wire terminal A and the neutral wire terminal N are connected in parallel with capacitor C6 and inductor L10 in turn, and then connected to pin 3 and pin 2 of the rectifier module DB1 respectively; the output pin 1 of the rectifier module DB1 is connected to the input terminal 1 of the power converter T1, and parallel capacitors C7, C8 and parallel resistors R34, R35 are arranged on its connecting line. Through the coordination of the circuit breaker F1, the rectifier module DB1, the power converter T1 and the PWM chip IC4, the three-phase power supply unidirectional 220V AC power is filtered, rectified and transformed, and output as a stable 5V DC power supply, providing working power for the conventional safety monitoring system. However, the electric power equipment monitoring devices disclosed in the above patents all have the above problems. Summary of the invention

[0004] The purpose of the utility model is to provide a power management module, which not only has low power consumption in voltage reduction and effectively solves the heating problem, but also generates low ripple voltage, small voltage noise and high power supply stability, thereby ensuring the normal operation of internal components of the power equipment status monitoring device.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a power management module, including a power supply, a DC-DC step-down chip, a first linear voltage regulator chip, a second linear voltage regulator chip, a multi-channel linear voltage regulator chip and a voltage reference chip, the output of the power supply is connected to the input of the DC-DC step-down chip, the output of the DC-DC step-down chip is divided into two paths, one path is connected to the input of the first linear voltage regulator chip, and the other path is connected to the input of the second linear voltage regulator chip, the output of the first linear voltage regulator chip is connected to a digital synthesizer, the output of the second linear voltage regulator chip is divided into three paths, the first path is connected to a radio frequency detector, the second path is connected to the input of the multi-channel linear voltage regulator chip, and the third path is connected to the input of the voltage reference chip, the output of the multi-channel linear voltage regulator chip is divided into multiple paths and connected to the main control chip at the same time, and the output of the voltage reference chip is connected to an analog-to-digital sampling chip.

[0006] Furthermore, the power supply is a lithium battery, and the lithium battery outputs a 12V DC voltage.

[0007] Furthermore, the DC-DC step-down chip adopts an LM2596 chip, and the LM2596 chip inputs a 12V DC voltage and outputs an 8V voltage to provide to the first linear voltage regulator chip and the second linear voltage regulator chip respectively.

[0008] Furthermore, the first linear voltage regulator chip is a linear voltage regulator chip with adjustable output voltage.

[0009] Furthermore, the first linear voltage regulator chip adopts an LM317 chip, and the LM317 chip inputs an 8V voltage and outputs a 3.3V voltage to power the digital synthesizer alone.

[0010] Furthermore, the second linear voltage regulator chip is a linear voltage regulator chip with a fixed output voltage.

[0011] Furthermore, the second linear voltage regulator chip adopts a CJ7805 chip, the CJ7805 chip inputs an 8V voltage, outputs a 5V voltage to power the RF detector, outputs a 5V voltage to provide a multi-channel linear voltage regulator chip, and outputs a 2.5V voltage to provide a voltage reference chip.

[0012] Furthermore, the multi-channel linear voltage stabilizing chip adopts EA3059 chip, and the EA3059 chip inputs 5V voltage and outputs 3.3V, 1.35V, 1.0V, and 1.8V voltages which are simultaneously provided to the main control chip.

[0013] Furthermore, the voltage reference chip adopts a REF2925 chip, and the REF2925 chip inputs a 2.5V voltage.

[0014] Furthermore, the digital synthesizer adopts an AD9854 chip, the radio frequency detector adopts an AD8302 chip, and the analog-to-digital sampling chip adopts an AD7655 chip.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a power management module, which performs multi-stage voltage reduction and voltage regulation through the circuit design of a DC-DC step-down chip and multiple linear voltage regulator chips. It can not only provide different voltages for the internal modules of the power equipment status monitoring device and improve the diversity and rationality of the power supply voltage, but also reduce the power consumption during voltage reduction and effectively solve the heating problem. At the same time, it avoids the AC interference and clutter in the power supply. The power supply voltage has the advantages of good stability, good power supply characteristics, and small voltage ripple, thereby meeting the working requirements of the power equipment status monitoring device, ensuring that the internal components of the power equipment status monitoring device work in a normal state, and extending the working life of the power equipment status monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a circuit principle block diagram of the power management module of the embodiment of the utility model;

[0017] Figure 2 It is a circuit diagram of a DC-DC buck chip in an embodiment of the utility model;

[0018] Figure 3 It is a circuit diagram of a multi-channel linear voltage stabilizing chip in an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] In order to meet the voltage requirements of the power equipment status monitoring device when it is working, such as Figure 1As shown, this embodiment provides a power management module, including a power supply, a DC-DC step-down chip, a first linear voltage regulator chip, a second linear voltage regulator chip, a multi-channel linear voltage regulator chip and a voltage reference chip. The output of the power supply is connected to the input of the DC-DC step-down chip. The output of the DC-DC step-down chip is divided into two paths, one path is connected to the input of the first linear voltage regulator chip, and the other path is connected to the input of the second linear voltage regulator chip. The output of the first linear voltage regulator chip is connected to a digital synthesizer of an electric power equipment status monitoring device. The output of the second linear voltage regulator chip is divided into three paths, a first path is connected to a radio frequency detector of the electric power equipment status monitoring device, a second path is connected to the input of the multi-channel linear voltage regulator chip, and a third path is connected to the input of the voltage reference chip. The output of the multi-channel linear voltage regulator chip is divided into multiple paths and simultaneously connected to the main control chip of the electric power equipment status monitoring device, and the output of the voltage reference chip is connected to the analog-to-digital sampling chip of the electric power equipment status monitoring device.

[0023] In order to increase the portability of the power equipment status monitoring device, the device uses a lithium battery as the power supply, and the lithium battery outputs a 12V DC voltage. In order to avoid AC interference and clutter in the lithium battery and to reduce the DC voltage of the lithium battery in the application, the power management module of the device mainly includes two parts: DC-DC step-down and linear voltage regulation.

[0024] In this embodiment, the DC-DC step-down chip uses the LM2596 chip, the LM2596 chip inputs a 12V DC voltage, and outputs an 8V voltage to provide to the first linear voltage regulator chip and the second linear voltage regulator chip respectively.

[0025] This power management module uses the LM2596 chip to step down the 12V DC voltage twice. If 3.3V is directly converted from 12V, problems such as excessive power and significant heat generation may occur due to excessive voltage drop. The DC-DC chip is used as the chip for initial voltage reduction due to its advantages such as low power consumption, wide voltage regulation range, and efficiency of 80%~90%. The LM2596 can output a driving current of 3A, which can fully meet the power consumption requirements of the subsequent stage. This power management module chooses to output an 8V DC voltage and perform a subsequent secondary voltage reduction. In this embodiment, the LM2596 chip and its peripheral circuits are as follows: Figure 2 shown.

[0026] In this embodiment, the first linear voltage regulator chip is a linear voltage regulator chip LM317 with adjustable output voltage. The LM317 chip receives 8V voltage from the LM2596 chip and outputs 3.3V voltage to power the digital synthesizer. The digital synthesizer uses the AD9854 chip.

[0027] In this embodiment, the second linear voltage regulator chip adopts the linear voltage regulator chip CJ7805 with fixed output voltage. The CJ7805 chip inputs 8V voltage from the LM2596 chip, outputs 5V voltage to power the RF detector, outputs 5V voltage to the multi-line linear voltage regulator chip, and outputs 2.5V voltage to the voltage reference chip.

[0028] In this embodiment, the RF detector and analog-to-digital sampling chip of the power equipment status monitoring device and the DC input of the subsequent low-voltage part are provided by the CJ7805 chip. The RF detector adopts the AD8302 chip. The voltage reference chip adopts the REF2925 chip, and the analog-to-digital sampling chip adopts the AD7655 chip. The REF2925 chip is input with 2.5V by the CJ7805 chip and supplies power to the AD7655 chip. This power management module selects the voltage reference chip REF2925 to provide an external reference voltage to the analog-to-digital sampling chip AD7655 as an AD sampling reference. Due to the temperature drift characteristics, low voltage drop and stable output voltage of the voltage reference chip REF2925, the accuracy of analog-to-digital conversion is effectively guaranteed.

[0029] In this embodiment, the multi-line linear voltage regulator chip uses the EA3059 chip. The EA3059 chip receives a 5V voltage from the CJ7805 chip and outputs 3.3V, 1.35V, 1.0V, and 1.8V voltages to the main control chip at the same time, thereby powering the main control chip through the multi-line linear voltage regulator chip EA3059.

[0030] The EA3059 chip is a four-way power management chip that can provide an output voltage from 0.6V to the input voltage, with a load current of 2A per channel. It has a 24-pin QFN compact package and can input a DC 5V power supply. Therefore, the EA3059 chip can meet the power supply voltage requirements of the FPGA. The EA3059 chip contains a four-way synchronous power adjustment module, which can control the power output of the four channels by setting a bit, and can enable the power output pins independently to provide a flexible power-on sequence that meets the power-on sequence requirements inside the FPGA. The EA3059 chip circuit in this power management module is as follows: Figure 3 shown.

[0031] Different types of circuits and logic units inside the FPGA require different voltage and current levels to operate normally. Figure 3 As shown, the four-way synchronous power adjustment module outputs four voltages of different amplitudes that can respectively supply power for the internal logic power supply, I / O power supply, auxiliary power supply, core power supply, etc. at the PS and PL ends. Figure 3The EN1~EN4 pins shown are four enable pins. The power-on sequence of the enable pins affects the power-on timing inside the FPGA. The EN1 pin is directly connected to 5V after passing through R1. The 5V powered by EN3 is connected to the pin after connecting to capacitor C2. Therefore, EN1 is powered on first, and EN3 is connected to the power supply after the capacitor is fully charged. This ensures that the 1.0V output is earlier than the 1.8V output. The 1.8V generated later will enable EN2 and EN4, ensuring that 3.3V appears later than 1.8V, thereby ensuring the power-on timing of the FPGA.

[0032] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A power management module, characterized in that: It includes a power supply, a DC-DC step-down chip, a first linear voltage regulator chip, a second linear voltage regulator chip, a multi-channel linear voltage regulator chip and a voltage reference chip. The output of the power supply is connected to the input of the DC-DC step-down chip. The output of the DC-DC step-down chip is divided into two paths, one path is connected to the input of the first linear voltage regulator chip, and the other path is connected to the input of the second linear voltage regulator chip. The output of the first linear voltage regulator chip is connected to a digital synthesizer. The output of the second linear voltage regulator chip is divided into three paths, the first path is connected to a radio frequency detector, the second path is connected to the input of the multi-channel linear voltage regulator chip, and the third path is connected to the input of the voltage reference chip. The output of the multi-channel linear voltage regulator chip is divided into multiple paths and connected to a main control chip at the same time. The output of the voltage reference chip is connected to an analog-to-digital sampling chip.

2. The power management module according to claim 1, characterized in that: The power supply is a lithium battery, and the lithium battery outputs a 12V DC voltage.

3. The power management module according to claim 1, characterized in that: The DC-DC step-down chip adopts the LM2596 chip, and the LM2596 chip inputs a 12V DC voltage and outputs an 8V voltage to provide to the first linear voltage regulator chip and the second linear voltage regulator chip respectively.

4. The power management module according to claim 1, characterized in that: The first linear voltage stabilizing chip is a linear voltage stabilizing chip with adjustable output voltage.

5. The power management module according to claim 4, characterized in that: The first linear voltage regulator chip adopts LM317 chip, and the LM317 chip inputs 8V voltage and outputs 3.3V voltage to power the digital synthesizer separately.

6. The power management module according to claim 1, characterized in that: The second linear voltage regulator chip is a linear voltage regulator chip with a fixed output voltage.

7. The power management module according to claim 6, characterized in that: The second linear voltage regulator chip adopts CJ7805 chip, and the CJ7805 chip inputs 8V voltage, outputs 5V voltage to power the radio frequency detector, outputs 5V voltage to provide to the multi-line linear voltage regulator chip, and outputs 2.5V voltage to provide to the voltage reference chip.

8. The power management module according to claim 1, characterized in that: The multi-channel linear voltage stabilizing chip adopts the EA3059 chip, and the EA3059 chip inputs a 5V voltage and outputs 3.3V, 1.35V, 1.0V, and 1.8V voltages which are simultaneously provided to the main control chip.

9. The power management module according to claim 1, characterized in that: The voltage reference chip adopts a REF2925 chip, and the REF2925 chip inputs a 2.5V voltage.

10. The power management module according to claim 1, characterized in that: The digital synthesizer adopts the AD9854 chip, the radio frequency detector adopts the AD8302 chip, and the analog-to-digital sampling chip adopts the AD7655 chip.

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