Power circuit

Abstract

A power supply circuit, which includes: a linear voltage control block 5, used for stepping down the charging voltage of the power backup capacitor to within the load operating voltage range when the output voltage of the power supply in the form of a battery pack 2 exceeds the upper limit of the load operating voltage range and is used to control the charging voltage of the power backup capacitor to be substantially equal to the output voltage of the power supply when the output voltage of the power supply is in the operating voltage range of the load; and the current control circuit 6 is used to utilize the load operating The predetermined current value within the required power range controls the upper limit of the output current of the power supply.

Description

[0001] This application claims priority from a prior Japanese patent application JP 2003-367629, the contents of which are incorporated herein by reference. technical field [0002] The present invention relates to a power supply circuit using a battery, and more particularly, to a power supply circuit that performs circuit control to control the voltage generated by the battery to match the operating voltage range of a load and performs circuit control to control battery discharge The current upper limit, and when the load is too heavy and the discharge current exceeds the specified upper limit, the power supply circuit uses the energy stored in the electric double layer capacitor to provide power support, thereby effectively releasing the charging capacity of the battery. Background technique [0003] With reference to Japanese Laid-Open Patent Publication JP-A-H09-219933, three kinds of power supply electronic devices are proposed, which can use three types of batteries, n...

AI Technical Summary

Problems solved by technology

[0018] As mentioned above, in electronic devices that can use various types of batteries, when DC-DC converters are used to convert the voltage generated by the batteries, the following problems inevitably arise: because the DC-DC converters have to cover a wide range of voltages The conversion efficiency is reduced due to the wide range; the wide range of input voltage can also cause faults; or overvoltage occurs under no-load conditions

[0019] Also, in the case of periodically repeating the load of heavy load and light load, like the load pattern of the time division multiple access system represented by the radio communication device, due to the influence of the voltage drop caused by the internal resistance and capacitance discharge of the battery The resulting change in battery voltage due to low battery warnings, power outages, etc. while the battery still has residual capacity, the battery cannot be efficiently discharged to its final voltage

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