Discharger and discharger control method

Abstract

Upon detecting an external signal which instructs to stop discharge, an input voltage equal to or less than a set value for the prevention of overdischarge, or an output voltage equal to or more than a set value for the prevention of output of an overvoltage, a control unit (12) stops discharge to a load (40) by opening a switching element (4b) of a step-down unit (11b). Upon detecting that an external signal is reset or an input voltage equal to or more than a set value larger than the set value for the prevention of overdischarge, the control unit (12) resumes discharge to the load (40) by setting the switching element (4b) in a switching operation state or short-circuiting it.

Description

[0001] This application is a divisional application of an invention patent application with an application date of May 25, 2007, an application number of 200780034497.7, and an invention title of "Discharger and Discharge Control Method". technical field [0002] The present invention relates to a discharger and a discharge control method, and more particularly to a discharger and a discharge control method for controlling the output of a DC power supply to a load when a battery system composed of a plurality of battery packs is used as a DC power supply system. Background technique [0003] Compared with lead-acid batteries, Ni-MH storage batteries used in DC power supplies have higher energy density, longer battery life and less burden on the environment. They are small, lightweight, and portable, so they are used as automotive storage batteries or as power supplies for disaster countermeasures. , in recent years, haste is gaining popularity. [0004] In addition, in order...

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Problems solved by technology

Therefore, regardless of whether it is power supply based on a commercial power supply or not, no matter what state it is in, since the battery pack 30 always continues to supply power to the disconnecting portion 11c of the discharger 10B, the capacity of the battery pack 30 decreases rapidly, and the charge-discharge cycle increases, creating problems related to the decrease in battery life of the battery pack 30

[0023] in addition, Figure 4 discharger 10A or Figure 5 The above-mentioned problems of the discharger 10B, that is, the early deterioration of the battery pack 30 caused by the continuation of discharge, the erroneous output of the overvoltage to the load 40, and the lack of disconnection of parts from the outside of the discharger 10A, etc. In addition, regarding Disconnection operation conditions of the disconnection part 11c and recovery conditions from disconnection, diodes 2 (2a, 2c), increased installation space due to voltage drop due to insertion of the disconnection switch 4c, and construction of a battery system The problem of increased cost required, and the problem of reduced life of the battery pack 30 caused by supplying power to the disconnected portion 11c from the battery pack 30, are not limited to a battery pack composed of a plurality of nickel-metal hydride storage batteries. The situation of the battery system in which the power output by the relevant battery pack is supplied to the load through each DC-DC converter for step-up and step-down

[0024] For example, it is a battery pack composed of a plurality of combined lithium-ion batteries and other secondary batteries other than nickel-metal hydride storage batteries, and the power output by the battery pack is supplied to the load through each buck-boost DC-DC converter. A battery system, and further, a battery system that includes a primary battery and supplies power output by a plurality of battery packs composed of a combination of multiple batteries to a load through each DC-DC converter for buck-boosting, and further includes a battery system for power storage Problems also arise in battery systems where the power output from multiple power supplies composed of capacitors and multiple DC voltage sources is supplied to the load through each DC-DC converter for buck-boosting

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