Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2000-03-17
2001-07-31
Shingleton, Michael B (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
C381S094500, C381S120000, C330S051000
Reexamination Certificate
active
06268773
ABSTRACT:
TECHNICAL FIELD
This invention relates to a power system or the like which supplies DC power to an electronic appliance into which contamination of noises from outside should be avoided as much as possible as in an amplifier for audio.
BACKGROUND ART
Conventionally, as a power system which supplies DC power to an electronic appliance such as an amplifier for audio which dislikes contamination of noises from outside, there was used such a system that, after accepting the supply of alternate power, which would be rectified, obtained a power in the shape of rectified wave, and obtained a direct current with ripples as little as possible by means of a smoothing capacitor, a ripple filter circuit, and a stabilizing circuit, etc., and outputted this.
However, even if the above described power system was used, any DC power completely without ripples was not obtainable, and in the case when such a DC power was supplied to the above described amplifier for audio, noise (hum) due to the ripples was generated by the amplifier for audio.
Taking the above described background into consideration, in recent years, amplifiers for audio, etc., which are supplied with power from batteries (that is secondary batteries) with huge capacities, have been proposed, and some have already been introduced for practical use.
However, an amplifier for audio, etc., powered by a battery with a huge capacity, which is large in size, is inconvenient in terms of transportability and installation, and in addition when the battery is discharged and the supply of power has been stopped, it will become necessary for the battery to be charged over a comparatively long hours, and during the period the amplifier for audio, and moreover, any audio equipment itself will not become unusable.
The present invention has been accomplished, by contemplating the above described backgrounds, and the purpose thereof is to provide a power system or the like which does not become very large in terms of size, and in addition does not halt any supply of DC power due to charging after discharge.
DISCLOSURE OF THE INVENTION
In a first invention, a power system to supply an electronic appliance with a DC power is configured as follows. That is, such a configuration comprises:
a plurality of secondary batteries;
a detecting circuit on absence of signal which detects whether or not there is any input signal into the above described electronic appliance, and in the case when there is no above described input signal continuously for a predetermined fixed time period, sends out a detecting signal on absence of signal to indicate such a state;
a charging circuit which, after receiving the supply of an alternate power, implements the supply of DC power for charging;
a connection switching circuit which connects one of a plurality of the secondary batteries with the above described electronic appliance so that the battery functions a secondary battery for the supply of power to supply the electronic appliance with a DC power, and connects the others with the above described charging circuit so as to function as secondary batteries to be charged, and every time when a detecting signal on absence of a signal is sent out from the detecting circuit on absence of a signal, switches connection status, and causes the one which functioned as the secondary battery for the supply of power up to the point of time to function as the secondary battery to be charged, and causes one of those batteries which functioned the secondary battery to be charged up to the point of time to function as the secondary battery for the supply of power.
The above described configuration makes such a power system obtainable that does not become very large in terms of sizes and in addition, for charging the battery after the time when the secondary battery on duty is completely discharged, will not halt the supply of DC power to the above described electronic appliance.
In the second invention, a power system to supply an electronic appliance with a DC power is configured as follows. That is, such a configuration comprises:
a plurality of secondary batteries;
a detecting circuit on absence of signal which, after a predetermined time has lapsed since switching in connection status in the later-described connection switching circuit has taken place, starts detecting whether or not there is any input signal into the above described electronic appliance, and in the case when there is no above described input signal continuously for a predetermined fixed time period, sends out a detecting signal on absence of signal to indicate such a state;
a charging circuit which, after receiving the supply of an alternate power, implements the supply of DC power for charging; and
a connection switching circuit which connects one of a plurality of said secondary batteries with the above described electronic appliance so that the battery functions a secondary battery for the supply of power to supply the electronic appliance with a DC power, and connects the others with the above described charging circuit so as to function as secondary batteries to be charged, and every time when a detecting signal on absence of a signal is sent out from the detecting circuit on absence of a signal, switches connection status, and causes the one which functioned as the secondary battery for the supply of power up to the point of time to function as the secondary battery to be charged, and causes one of those batteries which functioned the secondary battery to be charged up to the point of time to function as the secondary battery for the supply of power.
The above described configuration makes such a power system obtainable that does not become very large in terms of sizes, and in addition, for charging the battery after the time when the secondary battery on duty is completely discharged, will not halt the supply of DC power to the above described electronic appliance.
In the third invention, a power system to supply an amplifier for audio with a DC power is configured as follows.
That is, such a configuration comprises:
a plurality of secondary batteries;
a detecting circuit on absence of signal which, after a predetermined time has lapsed since switching in connection status in the later-described connection switching circuit has taken place, starts detecting whether or not there is any audio input signal into the above described amplifier for audio, and in the case when there is no the audio input signal continuously for a predetermined fixed time period, sends out a detecting signal on absence of signal to indicate such a state;
a charging circuit which, after receiving an alternate power, implements the supply of DC power for charging; and
a connection switching circuit which connects one of a plurality of said secondary batteries with the above described amplifier for audio so that the battery functions a secondary battery for the supply of power to supply the amplifier for audio with a DC power, and connects the others with the above described charging circuit so as to function as batteries to be charged, and every time when a detecting signal on absence of a signal is sent out from the detecting circuit on absence of a signal, switches connection status, and causes the one which functioned as the secondary battery for the supply of power up to the point of time to function as the secondary battery to be charged, and causes one of those batteries which functioned the secondary battery to be charged up to the point of time to function as the secondary battery for the supply of power.
The above described configuration makes such a power system obtainable that does not become very large in terms of sizes, and in addition, for charging the battery after the time when the secondary battery on duty is completely discharged, will not halt the supply of DC power to the above described amplifier for audio.
The fourth invention is configured so that the number of the secondary battery in the power system in the above described first through third inventions is two.
In the fifth invention, an amplification syste
Kanesaka & Takeuchi
Shingleton Michael B
Wellpine Communications Co., Ltd.
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