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Device and method for operating battery powered electric appliance

A technology for batteries and electrical appliances, applied to battery circuit devices, circuit devices, current collectors, etc., can solve problems such as large discharge, not portable, difficult battery storage, production and sales

Inactive Publication Date: 2010-01-20
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the prior art has the disadvantage that batteries for machine tools with high power requirements either discharge quickly when the machine tool is in operation or are large and not portable
In addition, there is the problem that batteries with high energy are considered dangerous goods, which makes storage, production and sales of batteries more difficult

Method used

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  • Device and method for operating battery powered electric appliance
  • Device and method for operating battery powered electric appliance
  • Device and method for operating battery powered electric appliance

Examples

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Embodiment Construction

[0020] figure 1 A power tool 3 is shown, namely a battery-operated screwdriver or a battery-operated drilling machine. The tool 3 has an electric motor inside its housing, by means of which a tool 4 , such as a drill or driver, can be set into rotation.

[0021] For powering the electric motor, a first battery 1 and a second battery 2 are provided for use. To receive these batteries, the power tool 3 has interfaces which, on the one hand, allow electrical contacting of the batteries and, on the other hand, ensure the mechanical fastening of the batteries 1 and 2 to the tool 3 .

[0022] The ratio of the power consumed by the electric motor to the power supplied by batteries 1 and 2 can be optimized in various ways. For example, in one embodiment of the invention it is provided that the parameters of batteries 1 and 2 are determined in such a way that each battery can guarantee the full power of electric tool 3 . By using the second battery, the available battery capacity is...

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PUM

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Abstract

The invention relates to a method for operating a battery powered electric appliance. In the method, the discharging current of the battery is adjusted by means of pulse width modulation, wherein at least a first battery and at least a second battery are provided, and the current pulses of the first battery are output in the inter-pulse periods of the second battery. Moreover, the invention relates to a device for current regulation when a plurality of parallel batteries are discharged. In the device, each battery is connected with a load via an associated switching element and connected with a control circuit. The switching elements can be controlled by the control circuit so that the power output by the batteries can be controlled through pulse width modulation of the current and so that only one of the batteries is connected with the load at a time.

Description

technical field [0001] The invention relates to a method and a device for operating a battery-operated electrical appliance, in which the discharge current of the battery is regulated by means of pulse width modulation. A method of the type mentioned at the outset is used in particular to regulate the current demand of a battery-operated machine tool. Background technique [0002] It is known from the prior art to equip power tools, such as grinders, screwdrivers, drills or hand-held circular saws, with batteries, so that these devices can also be used independently of the power grid. In this case, economical operation is achieved in particular when rechargeable batteries are used, which after use can be recharged by means of a charging device from the public power grid or the on-board power system of the motor vehicle for reuse. [0003] Furthermore, it is known from the prior art to regulate the current drawn from the battery by means of pulse width modulation when the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J1/10
CPCH02J2007/0067H02J7/0063H02J1/10H02J7/00711H02J7/007182
Inventor W·马蒂亚斯
Owner ROBERT BOSCH GMBH
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