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Active discharge circuit and method for hydrogen fuel cell system

A fuel cell system and discharge circuit technology, applied in battery circuit devices, electric vehicles, circuit devices, etc., can solve the problems of discharge function failure, long discharge time, and easily damaged resistors, and achieve shortened discharge time, widened applicability, The Effect of Good Thermal Design

Pending Publication Date: 2020-01-10
SHENZHEN FREECOOL SCI & TECH
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Problems solved by technology

Resistance discharge has the following two defects: On the one hand, the discharge time is long. Taking a discharge resistor of 500 ohms as an example, if the average value of the stack voltage is 70v during the discharge process, the time required to discharge 50 coulombs of electricity is about 50 / (70 / 500) = 357 seconds; on the other hand, the resistance heats up seriously, which is easy to damage the resistance and cause the discharge function to fail

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  • Active discharge circuit and method for hydrogen fuel cell system

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The present invention is used for the release of the residual hydrogen energy of the hydrogen fuel cell, mainly through the internal energy loss of the DC / DC converter to achieve the purpose of energy release; the present invention includes:

[0020] (1) DC / DC converter topology is mainly composed of multi-channel boost BOOST;

[0021] (2) At least one of the topological multi-channel BOOST of the DC / DC converter has two controllable switch tubes;

[0022] (3) The DC / DC converter receives the active discharge command sent by the stack system controller, controls the IGBT switch, and makes s...

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Abstract

The invention, which belongs to the technical field of fuel cells, discloses an active discharge circuit and method for a hydrogen fuel cell system. A DC / DC converter comprises two or more than two paths of boost circuits which are connected in parallel. Each boost circuit is provided with an inductor and a controllable switch tube connected with an anti-parallel diode; at least one path of boostcircuit has upper and lower controllable switch tubes, wherein the lower controllable switch tube is grounded. When discharging is performed, at least one path of boost circuit works in boost mode andat least one path of boost circuit works in a duck mode; and the step-up ratio of the output and input voltages is kept unchanged through current control. According to the invention, the discharge time can be shortened and the circuit topology can be simplified.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to an active discharge circuit and method for a hydrogen fuel cell system. Background technique [0002] In new energy vehicles powered by hydrogen fuel cells, the main DC / DC converter is used to output the energy of the hydrogen stack to the DC bus. When the system stops working, there is a certain amount of residual hydrogen (residual hydrogen) in the stack. , The DC / DC converter needs to release the energy of the residual hydrogen reaction within a certain period of time, so as to avoid the damage of the stack caused by the residual hydrogen. [0003] At present, the main method to release the remaining energy (remaining hydrogen) of the stack is to discharge the remaining hydrogen through resistance, and release the remaining hydrogen energy through resistance heating. Resistance discharge has the following two defects: On the one hand, the discharge time is long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J7/00H02M3/10H02M3/158
CPCH02J1/00H02M3/10H02M3/1584
Inventor 汤忠景孝凯杜戈阳
Owner SHENZHEN FREECOOL SCI & TECH
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