KR20010077702A - Power control circuit of amplifier - Google Patents

Abstract

PURPOSE: A power control circuit of an amplifier is provided to reduce power loss due to leakage current by using a power distributor device in a power control circuit. CONSTITUTION: A power supply source(11) provides an alternating power through the first and the second power lines. A rectification portion(12) converts the alternating power to direct power. A power distributor portion(13) receives the direct power and outputs a multitude of output signal having different delay time according to an operation of a power switch(17) of an amplifier. The first to the n-th switch portions(14) are driven according to the output signals of the power distributor portion(13). The first to the N-th power supply portions(16) receive the output signals from the first to the n-th switch portions through the first to the n-th safety portions(15).

Description

Power control circuit of amplifier

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control circuit of an amplifier, and more particularly, to an amplifier composed of a main amplifier circuit, a pre-amplifier circuit, a cassette / decoder circuit, and the like. In addition, the present invention relates to a power control circuit of an amplifier capable of improving the performance of an amplifier by supplying or cutting off power at a predetermined delay time interval during power on or power off operation.

In general, an amplifier is composed of a main amplifier circuit, a preamplifier circuit, a cassette / decoder circuit, and the like.

Input signals of the main amplifier circuit are supplied with output signals of the preamplifier circuit and the cassette / decoder circuit. That is, the output signal of the cassette / decoder circuit or the signal input from the outside (such as a microphone audio signal) is amplified through the preamplifier circuit and the main amplifier circuit, and then converted into a voice signal through a speaker connected to the output terminal of the main amplifier circuit. Is output.

However, in the conventional power control circuit, the following problems are generated by simultaneously supplying power to the main amplifier circuit, the preamp circuit, and the cassette / decoder circuit.

When the preamplifier circuit and the cassette / decoder circuit connected to the input terminal of the main amplifier circuit are enabled (turned on), power is supplied to the main amplifier circuit, and the output signal of the main amplifier is instantaneously transmitted to the speaker, resulting in noise -Sound), and a speaker with a small load capacity may cause a malfunction.

In addition, in the conventional power control circuit, as shown in FIG. 1, the power supplied from the power supply source 1 through the power supply line P2 is integratedly supplied to the amplifier 5. Then, the power supplied through another power line P1 is supplied to the power control means 3 through the rectifying means 2. At this time, the switching means 4 is turned on and off according to the output of the power control means 3, and the power line P1 is turned off when the turn on operation of the switching means 4 is performed. Power supplied through the amplifier 5 is supplied to operate the amplifier 5.

However, such a conventional power control circuit has a disadvantage in that a leakage current flows through the power line P2 integrated with the amplifier 5 when the amplifier is powered off.

Accordingly, an object of the present invention is to provide a power control circuit of an amplifier that can solve the above-mentioned disadvantages by using a power distributor means in the power control circuit of the amplifier.

The power control circuit of the amplifier according to the present invention for achieving the above object is in the power control circuit of the amplifier consisting of a main amplifier circuit, a pre-amp circuit and a cassette / decoder circuit, the AC power supply through the first and second power lines A power supply source for supplying the power supply, rectifying means for converting AC power supplied through the first and second power lines into DC power, and DC power converted by the rectifying means as inputs, and an amplifier power switch A power distributor means for outputting a plurality of output signals having different delay times according to the operation of the power supply, AC power input through the first and second power lines, and a predetermined delay according to the output signal of the power distributor means. First to nth switching means driven at time intervals, and output signals of the first to nth switching means Characterized in that it comprises a first to n-th power supply means to be sequentially input through the first to n-th safety means, respectively.

1 is a block diagram of a conventional power control circuit.

2 is a block diagram of a power control circuit of an amplifier according to the present invention;

3 is an output characteristic diagram of a power distributor means according to the present invention;

<Description of the symbols for the main parts of the drawings>

11 power source 12 rectification means

13 power distributor means 14 switching means

15: safety means 16: power supply means

17: amplifier power switch 18: main amplifier circuit

19: preamplifier circuit 20: cassette / decoder circuit

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

2 is a block diagram of a power control circuit of an amplifier according to the present invention, wherein the power supply 11 supplies AC power through the first and second power lines P1 and P2. AC power supplied through the first and second power lines P1 and P2 is converted into direct current (DC) power by the rectifying means 12 and supplied to the power distributor means 13.

At this time, the power distributor means 13 outputs the output signals S1 to Sn having different delay times according to the turn on operation of the amplifier power switch 17.

That is, as shown in FIG. 3, the output signal S1 is first turned on (t1 time), and the output signal Sn is finally turned on (tn time).

Therefore, the first to n th switching means 14 to which AC power is supplied through the first and second power lines P1 and P2 are output signals S1 to Sn of the power distributor means 13. ) Turns on at a constant delay time interval.

Accordingly, the output signals P11 and P12 to Pn1 and Pn2 of the first to nth switching means 14 are sequentially supplied to the first to nth power supply means 16 through the first to nth safety means 15. Is supplied.

At this time, the main amplifier circuit 18, the preamplifier circuit 19 and the cassette / decoder circuit 20 connected to the output terminals of the first to nth power supply means 16 are sequentially turned on.

Here, the first to n-th safety means 15 cuts off the first safety means when a problem occurs in the main amplifier circuit 18 due to abnormal power supply and the surrounding environment, thereby powering up the main amplifier circuit 18. The supply will be cut off. That is, the first to n-th safety means 15 blocks only the corresponding circuit when an abnormality occurs in each circuit.

In addition, in the case of the turn off operation of the amplifier, the power distributor means 13 outputs an output signal having a delay time opposite to the turn on operation of the amplifier according to the turn off operation of the amplifier power switch 17. S1 to Sn) are outputted.

That is, as shown in Fig. 3, the output signal Sn is first turned off (tn1 time), and the output signal S1 is finally turned off (t11 time).

Therefore, the respective circuits connected to the output terminals of the first to nth power supply means 16 are turned off in the order of the cassette / decoder circuit 20, the preamp circuit 19 and the main amplifier circuit 18.

Meanwhile, the power distributor means 13 uses a memory (CPU) or a timer circuit in which a program is built so that the output signals S1 to Sn can be output at different delay times. It can be changed by the user.

As described above, the turn-on operation of the amplifier is turned on in the order of the main amplifier circuit 18, the pre-amp circuit 19, and the cassette / decoder circuit 20, and the turn-off operation of the amplifier is reversely the cassette / decoder circuit. 20, the preamplifier circuit 19 and the main amplifier circuit 18 are turned off in order to prevent noise (beep sounds) and speaker failures generated in the prior art in advance. do.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains, as described above and the accompanying drawings. It is not limited to.

As described above, according to the present invention, by using the power distributor control means in the power control circuit of the amplifier, it is possible to prevent noise (beep-sound) and speaker failure caused in the prior art in advance, and to power off the amplifier. It is possible to completely cut off the power supplied through the power line from the power supply source by the time switching means, which has an excellent effect of preventing power loss.

Claims (2)

In the power control circuit of an amplifier consisting of a main amplifier circuit, a preamplifier circuit and a cassette / decoder circuit, A power supply source for supplying AC power through the first and second power lines; Rectifying means for converting AC power supplied through the first and second power lines into DC power; A power distributor means for inputting the DC power converted by the rectifying means and outputting a plurality of output signals having different delay times according to the operation of the amplifier power switch; First to n-th switching means which input AC power through the first and second power lines and are driven at a predetermined delay time interval in accordance with an output signal of the power distributor means; And first to nth power supply means for sequentially inputting the output signals of the first to nth switching means through the first to nth safety means, respectively. The method of claim 1, The power distributor means uses a built-in memory to output a plurality of output signals at different delay time intervals, and the power control of the amplifier, characterized in that configured to adjust the different delay time arbitrarily Circuit.