JPH04312316A - Combined electronic appliance - Google Patents

Abstract

PURPOSE:To save power in downsized combined electronic appliance. CONSTITUTION:In a combined electronic appliance for feeding power 4 through a single power supply loop 1 to a multi-function circuit, a circuit section 10 executing only one function, a circuit section 11 executing only another function and a circuit section 12 executing both functions are connected around the circuit section 12 so that they are fed with power 4, respectively, through the power supply loop 1. Furthermore, diodes D1, D2 and disposed at predetermined positions in the power supply loop 1 so that power is not fed to unnecessary circuits in the operation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite electrical device having multiple functions that can be used as a single product.

0002

[Prior Art] For example, a composite electric device having two functions, such as a CD (compact disc device) with a radio, has a circuit section that performs only one function and a circuit section that only performs the other function. It has a circuit section that also serves a function, and power is supplied to each of these circuit sections through a single power supply loop.

However, when power is supplied through a single power supply loop, when one of the functions is operated, the power is also supplied to a circuit section that performs only the other function. Therefore, conventionally, in the above case, a switching means for blocking the supply of power has been provided to a circuit section that performs only the other function.

0004

[Problems to be Solved by the Invention] However, in a portable composite electric device that aims to be as compact as possible, due to limitations in mounting space, the above-mentioned switching means is not provided, and circuit parts unrelated to the operation are also required. We had no choice but to configure it to supply power.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a composite electric device which is a small device and can save power.

[0006]

[Means for Solving the Problems] The composite electrical equipment of the present invention for achieving the above-mentioned problems has a plurality of functions that can be made into one product by itself, and connects the circuits of each function through a single power supply loop. In a complex electrical equipment that supplies power to a user, there is a circuit section that performs only one function, a circuit section that only performs the other function, and a circuit section that performs both functions. The power supply loops are connected to each other so that power is supplied from the power supply loops at the center, and power is supplied from opposite directions of the power supply loops when one function is operating and when the other function is operating, so that either one of the functions A diode is provided in the power supply loop so that power is not supplied to the circuit section that performs only the other function during operation.

[0007]

[Operation] When one of the functions is selected, power is supplied to the circuit section that performs only one function and the circuit section that performs both functions via the power supply loop, but only the other function is selected. No power is supplied to the circuit section to be executed, and this supply blocking can be achieved by simply adding a diode to the power supply loop.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a C with a radio, which is a composite electric device according to the present invention.
A circuit block diagram when applied to D is shown.

In FIG. 1, power supply loop 1 includes a CD
A driving regulator 2, a DD (direct current-direct current) converter 3, and a radio driving transistor Q1 are interposed,
A power supply 4 is supplied to the power supply loop 1 from a common connection point between the input side of the regulator 2 and the collector side of the transistor Q1.

Further, the power source 4 is also supplied to the microcomputer 6 via another regulator 5. The microcomputer 6 receives command signals from the play key 7, stop key 8, etc.
A control signal is output to the D signal processing circuit 12, regulator 2, etc. For example, when the play key 7 is turned on, the regulator 2 is driven and the CD signal processing circuit 12 executes the play mode. When the stop key 8 is turned on, the regulator 2 and the CD signal processing circuit 12 are controlled to stop their previous operations.

The radio selection switch SW1 controls the on/off of a pair of transistors Q2, and is configured so that the above-mentioned radio driving transistor Q1 is turned on/off by turning on/off of the pair of transistors Q2. That is, when the radio selection switch SW1 is turned on, the transistor Q1 is turned on, and when the radio selection switch SW1 is turned off, the transistor Q1 is also turned off.

Further, a switch SW2 is provided which operates in conjunction with the radio selection switch SW1, and this switch SW2 is connected in parallel with the stop key 8. Therefore, when the radio selection switch SW1 is turned on, the stop key 8 is short-circuited and the CD function mode is not accepted.

On the other hand, the circuit section 10 that executes only the CD function
and a circuit section 11 that performs only the radio function, and a circuit section 12 that performs both functions.
Power source 4 is supplied from

The circuit unit 10 that performs only the CD function includes pickup means 1 that picks up signals from the disc.
3, a CD signal processing circuit 14 for processing the picked up signal, a DA converter 15 for converting this output signal into an analog signal, and a buffer 16, and sends the CD signal to a line amplifier 19.

[0015] The circuit section 11 that executes only the radio function is
It has a tuner 17 that selects a signal of a desired frequency from antenna signals, and a radio signal processing circuit 18 that processes the output of the tuner into a waveform, and sends this radio signal to a line amplifier 19.

The circuit unit 12 that has both functions includes a line amplifier 19 and a headphone amplifier 20 connected via a variable resistor VR, and the headphone amplifier 20 sends a CD signal or a radio signal to the headphones 21. It will be done.

Further, a diode D1 is provided between the power supply point of the circuit section 10 that performs only the CD function of the power supply loop 1 and the power supply point of the circuit section 12 that performs both functions. The configuration is such that the power supply 4 is not supplied to the circuit section 10 that only performs the CD function from the direction of the arrow B.

A diode D2 is provided between the power supply point of the circuit section 11 that performs only the radio function of the power supply loop 1 and the power supply point of the circuit section 12 that performs both functions. The configuration is such that the power supply 4 is not supplied to the circuit section 11 that only performs the radio function from the direction of the arrow.

The operation of the above configuration will be explained below. When the play key 7 is turned on, the regulator 2 is activated and the circuit section 10 executes only the CD function from the direction of the arrow A.
The power source 4 is supplied to the circuit unit 12 that performs both functions, and CD audio is obtained from the headphones 21. Here, the circuit section 11 that performs only the radio function includes a diode D2.
Since the power source 4 is not supplied, power is saved.

Furthermore, when the radio selection switch SW1 is placed in the on position, the transistor Q1 is turned on without the regulator 2 operating, and the circuit section 11 that only performs the radio function from the direction of the arrow B and both functions are switched on. The power supply 4 is supplied to the circuit unit 12 for execution, and radio sound is obtained from the headphones 21. Here, the power supply 4 is not supplied to the circuit section 10 that only performs the CD function through the diode D1, resulting in power saving.

Furthermore, conventionally, a power supply 4 is provided to each circuit of the circuit section 11 that executes only the CD function when the radio function is operated.
is not only supplied, but also when a large output is output from the headphones 21, the voltage fluctuation of the power supply loop 1 is buffered by the buffer 16,
An oscillation loop occurs in which the signal comes out from each output of the DA converter 15 and then enters the input of the headphone amplifier 20, but according to this embodiment, such an oscillation loop does not occur.

The diodes D1 and D2 block power supply to unnecessary circuit sections 10 and 11 during each of the above-mentioned functions.
Since it was done by simply adding , almost no implementation space is required.

[0023]

Effects of the Invention As described above, according to the present invention, in a composite electrical equipment that supplies power to a circuit having multiple functions through a single power supply loop, a circuit unit that performs only one function and a circuit unit that performs only one function. A circuit unit that performs only the other function and a circuit unit that performs both functions are connected so that power is supplied from the power supply loop, respectively, with the circuit unit that performs both functions as the center, and the power supply loop Since a diode is provided at a predetermined position of the device so that power is not supplied to a circuit section unnecessary for operation, it is only necessary to add a diode that requires almost no mounting space, and this is effective in reducing power consumption of a small device.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram (embodiment) when the present invention is applied to a CD with a radio.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Power supply loop, 10...Circuit unit that performs only the CD function, 11...Circuit unit that executes only the radio function, 12...
Circuit portions that serve both functions, D1, D2...diodes.

Claims (1)

[Claims] [Claim 1] A circuit section that performs only one function in a composite electrical equipment that has multiple functions that can be used alone as one product and supplies power to the circuits of each function via a single power supply loop. A circuit unit that performs only one function and a circuit unit that performs both functions are connected so that power is supplied from the power supply loop, respectively, with the circuit unit that performs both functions as the center, and one function The power supply loop is configured so that power is supplied from opposite directions of the power supply loop during operation and when the other function is operated, and when one of the functions is operated, the power source is configured so that power is not supplied to the circuit section that executes only the other function. A composite electrification device characterized by having a diode installed in the supply loop.