KR930005536Y1 - Power control circuit for mini-headphone stereo - Google Patents

Abstract

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Description

Power control circuit for small headphone stereo

1 is an implementation circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

5: Switching unit 10: Remote key switch unit

15: system controller 20: built-in key switch unit

25: operation selector Q1, Q2, Q3: transistor

IC1: Voltage Comparison IC S1: Remote Switch

S2: Recording detection switch R1-R12: Resistance

The present invention uses a voltage logic deck and operates a voltage comparison IC that recognizes wired remote key presses in a small headphone stereo capable of wired remote control. It relates to a power control circuit of a small headphone stereo to reduce.

Hi-Fi cassettes or radio cassettes that use AC power are not a problem for the standby power consumed to check keystrokes, but headphones are stereo with small batteries and wired remote keys or built-in keys. In standby power supply, about 10-15mA consumed to check wired remote key input, has been a major factor in reducing battery life.

In other words, in a small headphone stereo that uses a built-in key embedded in a set or a wired remote key connected to the set to control the set operation, a voltage comparison IC is generally used to check a wired remote key input. Since it consumes the current (approximately 10-15mA) of the operating state for the key input check at all times, it was inconvenient to replace the battery frequently as it shortened the battery life.

The present invention has been made in view of the above, and aims to minimize power consumption by driving a voltage comparison IC for key input check only when a wired remote key is pressed in a small headfun stereo capable of wired remote control. It is done.

In order to achieve the purpose of minimizing power consumption by driving the voltage comparison IC only when the wired remote key is pressed as described above, the present invention provides a first switch for selecting the set built-in key and the wired remote key operation. And a set built-in key input means which is operated when the set embedded key of the first switching means is selected to apply a set control key input directly to a system controller, and a wired remote key when selecting the wired remote key of the first switching means. It is characterized in that it is provided with a second switching means which is operated when is pressed to drive the voltage comparison IC.

When described in detail based on the accompanying embodiments of the present invention as follows.

The small headphone stereo is equipped with a remote switch (S1) for selecting whether to operate with a remote key or a built-in key, and has a built-in set (K5-D9) for controlling the set operation by being embedded in the set. A wired remote key K0-K4 for remote operation is provided.

Here, the remote key K0-K4 is connected to the set and the terminal a to freely control the set, and when the remote key K0-K4 is pressed, the resistance value is changed so that the remote key switch unit 10 changes. Configure

The change in the resistance value of the remote key switch unit 10 is detected by the voltage comparison IC IC1 to determine which function the remote key is pressed. However, the voltage ratio IC IC1 is connected to the remote key K0-K4. Connect the switching unit (5) to operate only when one of the) is pressed.

Here, the switching unit 5 is a transistor Q2 which is operated when one of the remote keys K0-K4 is pressed when the remote key is selected at the remote switch S1, and a voltage comparison IC which is operated when the transistor Q2 is operated. It consists of the transistor Q1 which drives IC1.

That is, in the present invention, the power supply Vcc selected as the terminal ON of the remote switch S1 is applied to the collector shaft of the transistor Q2 and at the same time, the transistors R1, R2, R4, and R5 are connected through the transistors. Q2) to be applied to the base, and the terminal (a) (b) is connected to the connection point of the resistor (R4) and (R5) through the resistor (R6), and the remote key (K0-) to the terminal (a) (b). The remote key switch unit 10 composed of K4) and resistors R7-R10 is configured to be connected.

The voltage change of the remote key switch unit 10 is connected to be applied to the terminal IN of the voltage comparison IC IC1, and the terminal G ND of the voltage comparison IC IC1 is connected to the collector of the transistor Q1. The terminal Vcc is connected to the terminal ON of the remote switch S1 through the resistor R1.

The terminal (STOP) (FF) (REW) (PLAY) of the voltage comparison IC (IC1) is connected to the terminal (STOP) (FF) (REW) (PLAY) of the system controller 15, but a diode is connected to the terminal (REC). Connect the terminal (STOP) (PLAY) through (D7) (D8).

Meanwhile, one side of the built-in key K5-K8 is connected to the terminals STOP, FF, REW, and PLAY of the system controller 15, and the other side of the built-in key K5-K8 connects the diode D1-D4. The internal key K9 connected to the collector of the transistor Q3 and connected to the collector of the transistor Q3 is connected to the terminal PLAY (STOP) of the system controller 15 through the diode D5 and D6. .

At this time, the voltage comparison IC IC1 outputs the low level to the terminal corresponding to the selected function, and the system controller 15 performs the function corresponding to the terminal applied as the low level, and the recording detection switch S2 is safe to record on the tape. When the tab is attached, it is 'on' to enable recording, and if there is no recording safety tab, it is 'off' to prevent recording.

In the present invention of the configuration as described above looks first when the terminal (OFF) is selected by 'off' the remote switch (S1).

When the remote switch S1 is 'off', it is selected when the system is operated by the built-in key K5-K9 built in the set without operating the system by the remote key.

When the remote switch S1 is in the 'off' state as shown in the figure, the transistor Q3 of the operation selector 25 is applied to the power supply Vcc through the resistors R11 and R12 to be 'turned on'. When the transistor Q3 is 'turned on', one side of the built-in key K5-K9 becomes the ground potential, and the terminal SPOT (FF) (REW) of the system controller 15 is pressed as the built-in key K5-K9 is pressed. (PLAY) falls to the low level, whereby the system controller 15 controls the operation of the set.

That is, when the built-in key K8 is pressed, the terminal PLAY of the system controller 15 becomes low level due to the 'turned on' transistor Q3 of the diode D4 so that the system controller 15 performs the regeneration operation. In addition, when the built-in key K7 is pressed, the low level goes to the terminal REW of the system controller 15 due to the diode D3 and the transistor Q3 'turned on' so that the system controller 15 performs the rewinding operation. do.

Likewise, when the internal key K6 is pressed, the terminal FF of the system controller 15 becomes low level, and the set operation is sent quickly. When the internal key K5 is pressed, the terminal STOP of the system controller 15 is low. Level will stop the set.

When the built-in key K9 is pressed, the terminals STOP and PLAY of the system controller 15 go to the low level by turning on the transistors Q3 and diodes D5 and D6. The internal program is programmed to perform a recording operation when the terminal STOP (PLAY) is low level.

Here, the system controller 15 does not perform the recording operation if the recording detection switch S2 is not 'on' even when the terminal STOP (PLAY) is at a low level by pressing the internal key K9, and the recording detection switch S2 is performed. Recording is only performed when) is 'on'.

At this time, the recording detection switch (S2) is a switch that is 'on' when the recording safety piece of the tape does not fall off when recording is possible, and the switch is 'off' when the recording safety piece is dropped and impossible to record.

Accordingly, when the remote switch S1 is 'off', the system controller 15 drives the set according to the internal key K5-K9 input. At this time, the transistor Q3 of the operation selector 25 is turned on. And the diodes D1-D6 are used to prevent reverse voltage.

Meanwhile, the case where the terminal ON is selected by turning the remote switch S1 on will be described.

When the remote switch S1 is 'on', the power supply Vcc is not supplied to the operation selector 25 so that the transistor Q3 is 'turned off' and when the transistor Q3 is 'turned off', the internal key ( Even if K5-K9 is pressed, the low level is not applied to the terminals STOP, FF, REW, and PLAY of the system controller 15.

That is, when the remote switch S1 is turned on, the set cannot be operated by pressing the built-in key K5-K9 of the built-in key switch 20.

On the other hand, in order to remotely control the set, the terminal (a) (b) connected to the terminal (IN) of the voltage comparison IC (IC1) comprises a remote key switch 10 consisting of a remote key (K0-K4) and a resistor (R7-R10). The terminal of (a) (b) is to be connected.

In this way, the terminal (a) (b) of the remote key switch unit 10 is connected to the terminal (a) (b) connected to the terminal (IN) of the voltage comparison IC (IC1), and the remote switch (S1) is turned on. If set, the operation is controlled according to the pressing of the remote key (K0-K4) of the remote key switch unit 10.

At this time, only by the operation of turning on the remote switch S1 and connecting the remote key switch unit 10 to the terminal a, the voltage comparison IC IC1 is not driven, thereby reducing power consumption.

The reason is that the transistors Q1 and Q2 of the switching unit 5 maintain the 'turn off' state so as not to ground the terminal GND of the voltage comparison IC IC1, and the voltage comparison IC IC1 is connected to the terminal ( If GND) is not grounded, it will not operate, resulting in no power consumption.

However, when any one of the remote keys K0-K4 is pressed, the base side of the transistor Q2 of the switching unit 5 falls to a low level and becomes 'turned on', and when the transistor Q2 is 'turned on', the transistor Q1 ) Is 'turned on' to ground the terminal GND of the voltage comparison IC IC1 so that the voltage comparison IC1 operates only while the remote keys K0-K4 are pressed.

In other words, when any of the remote keys K0-K4 is pressed, the transistors Q1 and Q2 of the switching unit 5 are turned on to ground the terminal GND of the voltage comparison IC IC1. ) Is operated when the remote key (K0-K4) is pressed to check the voltage applied to the terminal (IN).

At this time, when the remote key (KO) of the remote key switch unit 10 is pressed, the voltage applied to the terminal IN of the voltage comparison IC (IC1) is If you press the remote key (K1) When pressing the remote key (K2) Press the remote key (K3) When pressing the remote key (K4) Becomes

In this way, when the remote key (K0-K4) is pressed, the voltage level applied to the terminal IN of the voltage comparison IC (IC1) becomes different, and the voltage comparison IC (IC1) checks the voltage input to the terminal IN. Output low level to the preset terminal.

That is, when the remote key K0-K4 of the remote key switch unit 10 is pressed, the voltage is applied and the voltage applied to the terminal IN of the IC IC1 is different, and the voltage comparison IC IC1 applies the applied voltage at this time. Check to output low level only to the terminal selected by remote key (K0-K4) and high level to other terminal. At this time, voltage comparison IC (IC1) operates the switching unit 5 only when the remote key is pressed. If the remote key (K0-K4) is not pressed, the voltage comparison IC (IC1) is not operated, thereby reducing power consumption.

As such, the voltage comparison IC IC1 compares the voltage level according to the pressing of the remote key K0-K4 and outputs the low level to the corresponding terminal. During reproduction, the voltage comparison IC IC1 outputs the low level to the terminal PLAY. Regenerate the set by dropping the terminal (PLAY) to the low level, and rewind by outputting the low level to the terminal (REW) by dropping the terminal (REW) of the system controller (15) to the low level. Let it work

The voltage comparison IC IC1 outputs the low level to the terminal FF during the fast send operation, and drops the terminal FF of the system controller 15 to the low level for fast send operation. A low level is output to the low level, and the terminal STOP of the system controller 15 is dropped to the low level to stop the operation.

On the other hand, when the recording operation is selected, a low level is output from the voltage comparison IC IC1 to the terminal TEC. Accordingly, the diodes D7 and D8 are 'on', so that the terminal STOP of the system controller 15 ( By dropping PLAY) to a low level, you can record a set.

At this time, the system controller 15 is programmed to perform a recording operation when the terminal STOP (PLAY) is at a low level, and performs a recording operation only when the recording detection switch S2 is recognized as 'ON'.

On the other hand, if the hold terminal (HOLD) is selected without selecting the 'on' or 'off' of the remote switch (S1), the power supply (Vcc) supplied to each part of the set is cut off and no operation is performed.

As described above, the present invention is a compact headphone stereo for controlling the driving of a set by a system controller according to input of a remote key and a built-in key. By operating the selector, only the internal key input is recognized by the system controller.When selecting a remote key, the voltage comparison IC is driven only when the remote key is selected, so that the system controller recognizes only the remote key input. It can reduce the power consumption of the set, and the built-in key input can be directly recognized by the system controller, so that the operation by the remote key and the built-in key can be performed using one voltage comparison IC.

Claims (1)

In the small headphone stereo in which the remote K0-K4 checks the internal key K5-K9 input by the system controller 15 to control the system, the remote key switch unit 10 constituted by the remote keys K0-K4. And a remote switch (S1) for selecting the operation of the built-in key switch unit 20 consisting of a built-in key (K5-K9), and is driven when the remote key (K0-K4) of the remote key switch unit (10) is pressed. The system controller 15 compares the switching unit 5 which grounds the terminal GND of the comparison IC IC1 with the voltage which is driven during the operation of the switching unit 5 and applied by the remote key switch unit 10. Power control of a small headphone stereo composed of a voltage comparison IC IC1 for applying a control signal to the control unit and an operation selection unit 25 for driving the built-in key switch unit 20 by selecting driving by the remote switch S1. Circuit.