CN201611388U - Extensible voltage detecting system for single fuel cell - Google Patents

Abstract

The utility model discloses an extensible voltage detecting system for single fuel cell. Voltage signals of every two fuel cells in a fuel cell stack are respectively subject to voltage division by a voltage-dividing resistor and then output to a corresponding operational amplifier to be output to an A/D port of a single chip machine. The extensible voltage detecting system for single fuel cell can realize co-operation of multiple devices without the need of changing hardware structure of equipment and lower computer software, is easy for extension, and has excellent universality.

Description

A Scalable Fuel Cell Monolithic Voltage Inspection System

technical field

The utility model relates to a detection system, in particular to an expandable inspection system for detecting the single-chip voltage of a fuel cell.

Background technique

The monolithic voltage monitoring (CVM) system is an important part of the fuel cell test system, and its safety, reliability, and effectiveness are important guarantees for fuel cell testers to effectively monitor and evaluate the system.

At present, the known fuel cell single-chip voltage inspection systems are all aimed at specific stack modules, and the corresponding voltage inspection system is designed according to the number of cell voltages to be detected, using a single monitoring device or multiple sets of devices. monitor.

ZL200710099293.3 proposes a fuel cell-oriented single-chip voltage inspection system, which uses a single monitoring device for all 540 fuel cells. Another common monitoring method is to jointly detect multiple sets of monitoring devices.

A single monitoring device has certain limitations. When the number of monomer voltages to be detected needs to be increased or decreased, its detection channels are insufficient or redundant, and the scalability is insufficient; the multi-set monitoring device system has good flexibility and can An appropriate number of monitoring units is selected according to the actual test requirements, but the matching between the monitoring units and the versatility of using the same monitoring device in different test systems are still insufficient.

Utility model content

In order to solve the above-mentioned problems in the above-mentioned prior art, the utility model proposes an expandable fuel cell single-chip voltage inspection system. This system can realize multiple sets of devices to work together without changing the hardware structure and lower computer software. Expansion, with good versatility.

The utility model can be solved by the following technical solutions:

An expandable fuel cell single-chip voltage inspection system, the voltage signals of every two fuel cells in the fuel cell stack are divided by voltage-dividing resistors and output to the corresponding operational amplifier, and then output to the corresponding operational amplifier through the operational amplifier. The A/D port of the microcontroller.

As a preferred embodiment of the present utility model:

The single-chip microcomputer of the utility model is connected with a reference voltage; the I/O port of the single-chip microcomputer is connected with a four-position dial switch; the single-chip microcomputer adopts MC9S08DZ60.

Due to the adoption of the above technical scheme, the utility model has a high detection accuracy of fuel cell voltage, which can reach 0.01V; the dial code of the fuel cell inspection system can be set to different values according to actual needs, so that multiple Multiple monitoring units can work together to facilitate expansion.

Description of drawings

Fig. 1 is the schematic diagram of the utility model system

Fig. 2 is the application schematic diagram of dial switch in the utility model

Detailed ways

Below in conjunction with specific embodiment, further set forth the utility model:

As shown in Figure 1, a scalable fuel cell single-chip voltage inspection system, the voltage signals of each two fuel cells in the fuel cell stack are divided by voltage-dividing resistors and output to the corresponding operational amplifiers, and then output to the corresponding operational amplifiers. It is output to the A/D port of the microcontroller through the operational amplifier. There is a reference voltage of 4.096V outside the microcontroller, which ensures the high precision of A/D conversion. The single-chip microcomputer adopts MC9S08DZ60, which is low in cost and supports CAN network. Since the ADC module of MC9S08DZ60 has 24 analog input interfaces, one single-chip microcomputer can measure 24 voltage signals, which is very suitable for the development of fuel cell voltage inspection system.

The I/O port of the MCU is connected with a four-digit dial switch, and the MCU software automatically modifies the ID of sending and receiving data according to the address of the dial switch. The convenience brought by this is mainly: multiple modules can use the same program , you only need to set the address according to the order when using it. As shown in Figure 2, one end of the dial switch is connected to the ground in parallel, and the other end is connected to the four I/O terminals of the microcontroller. Read external switch value. Increment the initial ID of the dataframe with the read extrinsics. The CVM unit is uniquely marked by the on-off control of the four-position dial switch. The four-position dial switch has a total of 16 dial codes, so a maximum of 16 CVMs can work together. As a voltage detection signal, the system can be expanded to detect 24*2*16=768 fuel cell monomers, which can meet most of the current stack test requirements. The number of digits of the dial switch can also continue to increase, and its expansion scale can also increase proportionally.

Specific test case 1: In the backup power fuel cell system test platform, the total number of cells to be tested is 90, and the voltage of two cells is used as a test signal. The actual number of voltage signals to be tested is 45, and 2 Each CVM unit, set its dial code to 0001, 0010 respectively, the upper computer and the FCU unit send trigger frames to the CAN communication network at regular intervals, and after receiving the trigger signal, the three CVM units feed back the collected monomer voltage to the CAN communication network in turn information, the host computer and FCU unit receive the corresponding data frame by extracting different ID numbers, and display the voltage signal in real time.

Specific test case 2: In the 10kW car stack test platform, the total number of stack cells to be tested is 144, and the voltage of two cells is used as a test signal. The actual total test voltage signals are 72, and 3 For each CVM unit, set the dial codes to 0001, 0010, and 0011 respectively, and the host computer can obtain real-time voltage feedback signals by periodically sending trigger frames.

In the two implementation cases, the CVM units used are exactly the same. You only need to select an appropriate number of CVM units according to the number of cells to be tested, and set their dial codes to different values. The upper computer and the FCU unit can Obtain the corresponding voltage signal to monitor the operation status of the stack in real time.

However, the above-mentioned specific implementations are only exemplary, and are for better understanding of this patent by those skilled in the art, and cannot be interpreted as limiting the scope of this patent; as long as any Equivalent changes or modifications all fall within the scope of this patent.

Claims (4)

1. A scalable fuel cell monolithic voltage inspection system is characterized in that: the voltage signals of every two fuel cells in the fuel cell stack are respectively output to the corresponding operational amplifiers after being divided by a voltage dividing resistor, and then It is output to the A/D port of the microcontroller through the operational amplifier. 2. An expandable fuel cell single-chip voltage inspection system according to claim 1, characterized in that: said single-chip microcomputer is connected with a reference voltage. 3. An expandable single-chip voltage inspection system for fuel cells according to claim 2, wherein a four-position dial switch is connected to the I/O port of the single-chip microcomputer. 4. An expandable fuel cell single-chip voltage inspection system according to any one of claims 1-3 above, characterized in that: the single-chip microcomputer adopts MC9S08DZ60.

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