JP3254293B2 - electric circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of supplying power to a plurality of circuits constituting an electric device for the purpose of reducing current consumption of the electric device.

[0002]

2. Description of the Related Art Generally, an electric device is constituted by a plurality of circuits as shown in FIG. 2, and each circuit operates at various voltage values. The voltage value (V1) of the main power supply 13 used for the device is determined according to the circuit 5 operating at the highest voltage. Therefore, the voltage value (V1) of the main power supply 13
The circuit 1 and the circuit 2 that operate at a lower voltage value (V2) include a voltage adjustment circuit 1 including a stabilized power supply and a series resistor.
In step 8, the voltage needs to be adjusted and supplied to each circuit. Similarly, the voltage value (V1) lower than the voltage value (V1) of the main power supply 13
The circuits 3 and 4 operating in 3) are provided with a voltage adjusting circuit 19.
To adjust the voltage and supply it to each circuit. The currents I1 to I5 corresponding to the respective circuits are consumed in the circuits 1 to 5 to which the power is supplied.

That is, the total current consumption It is represented by the following equation (1). It = I1 + I2 + I3 + I4 + I5 (1) Accordingly, the total power consumption Pt of the device is represented by the following equation (2). Pt = V1 × It (2)

[0004] In the device configured as described above,
The power is also consumed by the voltage adjustment circuit, and the powers P11 and P12 consumed by the voltage adjustment circuit 18 and the voltage adjustment circuit 19, respectively.
Is represented by equations (3) and (4). PL1 = (V1−V2) × (I1 + I2) (3) PL2 = (V1−V3) × (I3 + I4) (4) That is, of the total power consumption Pt expressed by the equation (2) ,
The powers PL1 and PL2 expressed by the equations (3) and (4) are simply consumed as heat.

[0005]

As described above, according to the conventional power supply circuit system, the voltage regulating circuit consumes unnecessary power, which is disadvantageous for low power and miniaturization. The present invention has been made in view of the above, and has been made in order to solve such a problem. An object of the present invention is to provide a power supply circuit system that does not consume unnecessary power.

[0006]

In order to achieve the above object, the present invention provides a circuit group in which a plurality of circuits operating at a voltage lower than the main power supply are connected in parallel, and another circuit group having the same configuration. Alternatively, a single circuit is connected in cascade, and means for consuming only the difference between the total current consumption of the former circuit group and the total current consumption of the latter circuit group or the single circuit is provided. Power is supplied to the circuit.

[0007]

Therefore, according to the present invention, the power consumption and the size of the device can be reduced without wasteful power consumption.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the drawings. FIG. 1 is a block diagram showing an embodiment of a power supply circuit system according to the present invention. In this embodiment, the circuits operating at the same voltage value are divided into groups, and the groups are cascaded. That is, as shown in the embodiment, the point that a current corresponding to each circuit flows through each circuit is the same as that of the conventional example shown in FIG. Circuits 1 and 2 operating at a voltage value (V2) lower than (V1) are connected in parallel,
Similarly, the circuit 3 and the circuit 4 operating at a voltage value (V3) lower than the voltage value (V1) of the main power supply 13 are connected in parallel,
The former circuit group and the latter circuit group are connected in cascade. Further, a zener diode 6 having V3 as a zener voltage is connected in parallel to the latter circuit group.
Here, assuming that the former circuit group is a circuit group 1, the latter circuit group is a circuit group 2, a total current flowing through the circuit group 1 is It1, a total current flowing through the circuit group 2 is It2, and a current flowing through the Zener diode 6 is Iz. It1 and It2 can be expressed by equations (5) and (6). It1 = I1 + I2 (5) It2 = I3 + I4 (6) Further, if the relationship between It1 and It2 is expressed as It1> It2 (7), the current Iz flowing through the Zener diode 6 becomes
It is expressed by equation (8). Iz = It1-It2 (8) It is necessary to select Iz represented by the equation (8) so that the value of the operation of the Zener diode becomes sufficiently stable. If the relationship between It1 and It2 is set so as to satisfy the equation (9), the Zener diode 6 does not need to be connected. It1 = It2 (9) That is, according to the present invention, each circuit group can be connected in a cascade manner, and unnecessary power consumption consumed by the voltage adjustment circuit is eliminated. In the above embodiment, an example is shown in which another circuit group operating at the voltage value V3 is cascaded to a circuit group operating at the voltage value V2. The effect is obtained. It is apparent that the same effect can be obtained by a combination of three or more circuit groups or a single circuit. Even when the current value of each circuit changes due to environmental changes, if the current value of each circuit is set so as to satisfy the condition of equation (7), the change in the current value is absorbed by the Zener diode, Since the voltage value is constant, it is clear that each circuit operates stably.

[0009]

As described above, according to the present invention, a voltage adjusting circuit becomes unnecessary, and unnecessary power consumption can be eliminated.
In addition, since the condition of equation (7) may be satisfied so that the operation of the Zener diode is sufficiently stabilized, the degree of freedom in setting the current value of each circuit can be expanded, the circuit can be easily realized, and the current can be easily reduced. become. Further, since high stability can be obtained against environmental changes, it is effective for use in electronic devices.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional configuration method.

[Explanation of symbols]

 1-5 Circuit block 6 Zener diode 13 Main power supply 18-19 Voltage adjustment circuit

Claims (2)

(57) [Claims] 1. A main power supply and a voltage lower than a voltage value V1 of the main power supply.
Circuits operating at different voltage values V2 are connected in parallel
A first circuit group and a voltage lower than the voltage value V1 of the main power supply
The voltage of the second circuit operating at the value V3 or the voltage of the main power supply
A plurality of circuits operating at a voltage value lower than the value V1 in parallel
A first circuit group and a second circuit group
Connect the circuit or second circuit group in a custard form
An electric circuit characterized by being configured as described above . 2. The electric circuit according to claim 1, wherein the total current consumption of the first circuit group is compared with the second circuit or the second circuit.
A method that consumes only the current difference from the total current consumption of the circuit group
Stage, the voltage value V2 of the first circuit group and the second circuit
Or the sum with the voltage value V3 of the second circuit group is
When the pressure value is equal to V1, each circuit can be used without wasting power.
Characterized in that it is configured to supply power to the
circuit.