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On-line detection circuit and detection method of photovoltaic battery health assessment for wsn node

A detection circuit and health assessment technology, applied in battery circuit devices, photovoltaic power generation, photovoltaic system monitoring, etc., can solve problems such as inability to replace batteries in time, inability to detect battery health status online, and inability to evaluate battery health status

Active Publication Date: 2020-08-04
ZHEJIANG UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention mainly solves the technical problem that the current WSN node (that is, the wireless sensor node) uses a photovoltaic system that cannot perform online detection of the battery health status, cannot evaluate the battery health status, and thus cannot replace the battery in time and troubleshoot; it provides a WSN The online detection circuit and detection method of photovoltaic battery health assessment for nodes can perform online detection of the battery health status of the photovoltaic system for WSN nodes, evaluate the battery health status, facilitate timely replacement of batteries, and timely troubleshooting, thereby ensuring normal operation of WSN nodes run

Method used

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  • On-line detection circuit and detection method of photovoltaic battery health assessment for wsn node
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  • On-line detection circuit and detection method of photovoltaic battery health assessment for wsn node

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Experimental program
Comparison scheme
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Embodiment 1

[0037] Embodiment 1: The WSN node of this embodiment uses the photovoltaic cell health assessment online detection circuit, such as figure 1 As shown, it includes a central processing unit 1, a charge control circuit 2, a discharge control circuit 3, a constant current load circuit 4, a first MOS tube switch circuit 5, a second MOS tube switch circuit 6 and a third MOS tube switch circuit 7, charging The input terminal of the control circuit is connected to the solar battery Solar through the first MOS tube switch circuit, the output terminal of the charging control circuit is connected to the battery Battery, and the battery Battery is connected to the input terminal of the discharge control circuit, and the output terminal of the discharge control circuit is connected to the third The MOS tube switch circuit is connected to the load 8, the series circuit formed by the constant current load circuit and the second MOS tube switch circuit is connected in parallel with the batter...

Embodiment 2

[0044] Embodiment 2: The WSN node of this embodiment uses the online detection circuit of photovoltaic battery health assessment, such as Figure 5As shown, the constant current load circuit includes an operational amplifier U41, and the second MOS tube switch circuit includes a MOS tube Q42; the non-inverting input terminal of the operational amplifier U41 is connected to the positive pole of the battery through the resistor R42 and the resistor R41, and is connected to the positive pole of the battery through the resistor R43 and the MOS tube. The drain of Q42 is connected, the connection point of resistor R42 and resistor R41 is connected with the negative electrode of voltage regulator D41, the positive electrode of voltage regulator D41 is connected with the drain of MOS transistor Q42, the inverting input terminal of operational amplifier U41 is connected with the transistor Q41 The emitter is connected, the collector of the transistor Q41 is connected to the positive ele...

Embodiment 3

[0045] Embodiment 3: The WSN node of the present embodiment uses the photovoltaic cell health assessment online detection circuit. The difference from Embodiment 1 is that the central processing unit is a single-chip microcomputer specially set in the detection circuit. In the present embodiment, the WSN node has an RS485 interface. The RS485 communication is adopted between the single-chip U1 and the WSN node, so an RS485 communication interface circuit needs to be added. Such as Figure 7 , Figure 8 As shown, the central processing unit includes a single-chip microcomputer U71, and the single-chip microcomputer U71 adopts a STC8C1K12 single-chip microcomputer; the RS485 communication interface circuit includes an RS485 interface chip U62, and the RS485 interface chip U62 adopts an XR33032 chip. Pin 8 of the single-chip microcomputer U71 is connected to the positive pole of the battery and grounded through the capacitor C71, pin 10 of the single-chip microcomputer U71 is gr...

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Abstract

The invention relates to an online detection circuit and method for the health assessment of a photovoltaic cell for a WSN node. The detection circuit is characterized in that the input end of a charging control circuit is connected to a solar cell via a first MOS transistor switching circuit; the output end of the charging control circuit is connected to a battery; the battery is connected to theinput end of a discharging control circuit; the output end of the discharging control circuit is connected to a load through a third MOS transistor switching circuit; a constant-current load circuitand the second MOS transistor switching circuit are connected and then are connected in parallel with the battery; and charging and discharging termination signals and the control terminals of the three MOS transistor switching circuits are connected to a central processing unit. The detection method comprises the steps of first disconnecting a discharging circuit to in order that the battery is in a state where the battery is only charged but not discharged; after the battery is fully charged, disconnecting the charging circuit, and connecting the constant-current load circuit in order that the battery is in a state where the battery is only discharged but not charged; and recording, by the central processing unit, the discharge time of the now and old batteries so as to realize the SOH detection of the battery. The detection circuit and method can obtain relatively accurate detection results, and contribute to timely cell replacement.

Description

technical field [0001] The invention relates to an on-line battery detection system, in particular to an on-line detection circuit and detection method for photovoltaic battery health assessment for WSN nodes. Background technique [0002] Wireless sensor network (WSN) is a wireless communication network composed of a large number of sensor nodes. When it is distributed in an outdoor environment, it is difficult to obtain energy through power lines. Therefore, in addition to battery power supply, photovoltaic power supply system has also become its main power supply mode. . However, as the number of charge and discharge cycles increases, the life of the battery in the photovoltaic system will gradually decrease or even fail, and it needs to be replaced in time. Therefore, it is very necessary to evaluate the state of health of the battery in a timely and accurate manner. However, the current photovoltaic system for wireless sensor nodes focuses on the realization of charge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/35H02S50/10
CPCH02S50/10Y02E10/50
Inventor 黄腾飞谢少伟干嘉诚
Owner ZHEJIANG UNIV OF WATER RESOURCES & ELECTRIC POWER