JPS58151621A - Electronic apparatus provided with solar battery - Google Patents

Abstract

PURPOSE:To always obtain a stable display irrespctive of surrounding brightness, by detecting electromotive force of plural solar batteries, and suitably switching the number of electric connections to an apparatus circuit, of each solar battery in accordance with a result of detection. CONSTITUTION:A solar battery SB is constituted of solar batteries S0-S6 connected in series, and S3-S6 among them are connected to a solar battery switching circuit SW of a CPU, respectively. The batteries S0-S2 are always connected to a logic circuit of the body, and the batteries S3-S6 are switched suitably as to its connecting state. A voltage comparator CP inputs output electromotive force SW0 of the circuit SW, and reference voltage VRef, outputs a control signal in accordance with a difference of both, and this circuit SW receives this signal, and switches suitably the connecting state of the batteries S3-S6. When the incident light quantity of the batteries S0-S6 increases and the electromotive force SW0 exceeds the reference, the SW is operated by a control signal of the CP, and the batteries S5, S6 are cut off so that the electromotive force returns to its original reference. When the incident light quantity decreases, the batteries S5, S6 are connected again so that the electromotive force returns to its original reference.

Description

[Detailed Description of the Invention] The present invention relates to a so-called solar cell-equipped electronic device using the electromotive force of a solar type 7132 as a driving source, and in particular, to an electronic device that can always provide a stable display regardless of changes in ambient brightness. It is.

The electromotive force of solar cells changes significantly depending on the surrounding brightness. For this reason, electronic devices that use the electromotive force of solar cells as a driving source have the disadvantage that when the amount of light incident on the solar cells increases, an electromotive force greater than the specified value is applied, causing display blurring. Furthermore, as the amount of incident light decreases, the electromotive force also decreases, resulting in disadvantages such as dimming of the display and slow response time of the device.

In view of these conventional drawbacks, the present invention is designed to always provide an optimal display by changing the number of solar cells connected to the main body of the device according to the surrounding brightness to obtain an appropriate electromotive force. be.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a perspective view of the external appearance of a calculator with a solar battery according to the present invention, in which A is the main body, K is the main board, D is the liquid crystal display section,
SB is a solar cell.

As shown in Fig. 2, the solar cell SB consists of seven solar cells/m (so-56) connected in series, and of these solar cells (S3 to S6) are each connected to a central processing unit CPU. It is connected to the solar heavy oil switching circuit SW. This is because the solar cells So to S2 are always connected to the logic circuit of the main body, and the connection state of the later solar cells 83 to S6 is appropriately switched.

cp is the output (electromotive force) Sw of the switching circuit SW.

This is a voltage comparator that inputs the reference voltage Vref and outputs a control signal according to the difference between the two, and the switching circuit SW receives this control signal and switches the solar cells 83 to S.
6 as appropriate.

According to this configuration, when the amount of light incident on the solar cells (SO to S6) increases and the electromotive force (Swo) rises to the reference value, the switching circuit SW is activated by the control signal of the voltage comparator CP, and the electromotive force increases. For example, solar cell S to return to the original standard.
5 and 86 are blocked.

On the other hand, in this state, when the amount of incident light is a little less than one region and the electromotive force becomes less than the standard, the switching circuit SW is activated by the control signal of the voltage comparator CP, and the electromotive force returns to the original standard. For example, by reconnecting the solar cells S5 and 86, the electromotive force obtained from all the installed solar cells 5o-86 is supplied to the logic circuit.These switchings are instantaneous, so the logic circuit is A constant electromotive force is always applied regardless of changes in ambient brightness.

As described above, the electronic device with a solar streetcar of the present invention detects the electromotive force obtained from a plurality of installed solar cells, and adjusts each electromotive force according to the detection result so that the electromotive force always remains at a constant value. Since the number of solar cells electrically connected to the device circuit is changed as appropriate, the resulting electromotive force is always set to be constant regardless of changes in ambient brightness. Therefore, it is possible to eliminate the conventional drawbacks such as blurring of the display and delay in response time.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a solar battery-equipped vehicle according to the present invention, FIG. 2 is a block diagram of the vehicle, and FIG. 3 is a circuit diagram of the main parts of the CPU. A is the main body, K is a thousand-board, D is a display section, SB is a solar cell unit, CPU is a central processing unit, SW is a switching circuit, CP is a voltage ratio regulator, and 5o-S is a solar cell. Agent Patent Attorney Aihiko Fukushi (other name) Figure 3

Claims (1)

[Claims] 1. In an electronic device equipped with a plurality of solar cells and using their electromotive force as a driving source, the electromotive force is detected, and the device of each solar cell is controlled according to the detection result. An electronic device equipped with a solar cell, characterized by comprising means for appropriately switching the number of electrical connections to an opening.