JP2708742B2 - Power circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit used for small electronic devices and the like. [Summary of the Invention] The present invention relates to a solar cell, a current limiter connected to the solar cell, and corresponding to a voltage generated from the solar cell, for regulating a current generated from the solar cell, Via a current limiter means, connected to the solar cell, a rechargeable battery supplied with current regulated power supplied from the current limiter means via the current limiter means, the rechargeable battery and the A solar cell is connected via a power switch, and the rechargeable battery or a load to which current from the solar cell is supplied via a power switch is connected in parallel with the current limiter means. At a voltage or less, and turned on in a state where the power switch is on, the generated current of the solar cell bypasses the current limiter means The battery is controlled so as to flow to the load, and the rechargeable battery is turned off in a state in which the rechargeable battery is at a predetermined voltage or less and the power switch is off, so that the generated current from the solar battery is charged through the current limiter means. By providing switching means for controlling the flow to the battery, effective use of solar energy is achieved. [Problems to be Solved by Conventional Techniques and Inventions] In recent years, the spread and diversification of outdoor sports and outdoor leisure have increased the time spent outdoors, and tape devices such as tape recorders have been downsized. There are many opportunities to enjoy electronic devices such as recorders. However, as a power source for small tape recorders and the like in the field, there is still only batteries built into the main body of electronic devices such as tape recorders. There is annoying that it does not become. Then, this invention is provided with the solar cell and the rechargeable battery accompanying it, and an object of this invention is to provide the power supply circuit which utilized solar energy effectively. [Means for Solving the Problems] The configuration of the present invention for achieving the above object is a solar cell, which is connected to the solar cell, and corresponding to the power generation voltage from the solar cell, Current limiter means for regulating the generated current from the battery, and via the current limiter means, connected to the solar cell, the current-limited generated current supplied from the current limiter means the current limiter means A rechargeable battery supplied via a power switch, wherein the rechargeable battery and the solar cell are connected via a power switch, and a current supplied from the rechargeable battery or the solar cell via a power switch; The rechargeable battery is connected in parallel with a current limiter means, is turned on in a state where the rechargeable battery is at a predetermined voltage or less, and the power switch is on, and the While controlling the generated current to flow to the load bypassing the current limiter means, the rechargeable battery is below a predetermined voltage,
And switching means for turning off the power switch when the power switch is off, and controlling the generated current from the solar cell to flow to the rechargeable battery via the current limiter means. [Operation] When the solar cell generates power when the power switch is off, current is sent to the rechargeable battery via the current limiter means, and electricity is stored. When the power switch is on, the generated current from the solar cell or the electricity from the rechargeable battery is supplied to the load.At this time, the charge amount of the rechargeable battery is equal to or less than a predetermined value, that is, the electricity is stored in the rechargeable battery. Otherwise, electricity from the solar cell is supplied to the load via the switching means instead of the current limiter means. Embodiment An embodiment of the present invention will be described below with reference to the drawings. In the figure, a solar cell E ₁ and battery E _2, the respective ten terminal connected through a current limiter unit 1,
One terminal of each is grounded and connected in parallel. The solar cell E ₁ is, for example, a transparent portion in the tape recorder housing (not shown) is formed, inside, for example, single-crystal silicon element of the transparent portion is configured with a plurality of rows arranged. Further, the rechargeable battery E ₂ is constituted by a secondary battery such as a nickel cadmium battery. Said current limiter unit 1, the emitter terminal of the transistor Tr ₁ via a resistor R _1, a base terminal two diodes D _1, wherein each through a series circuit of a D ₂ solar cell E
Connected to _one of the ten terminals, it is constituted collector terminal of the transistor Tr ₁ is connected to the ten terminals of the rechargeable battery E _2, battery
To E ₂ so that is higher than the permissible current does not flow. Wherein the solar cell E ₁ and battery E ₂ a series circuit of a series circuit of a resistor R ₂ and a light emitting diode D ₃ and resistor R ₃ and resistor R ₄ is connected in parallel. The light emitting diode D ₃ is for a indicator that lights up when the power generation of the solar cell E _1. The transistor Tr ₂ has a collector terminal connected to a common connection point between the diode D ₂ and the base terminal of the transistor Tr ₁ via a resistor R ₅ , a base terminal connected to a common connection point between the resistors R ₃ and R _4, and an emitter. The terminals are each connected to ground. The transistor Tr ₂ is to prevent discharge of the battery E ₂ in the non-power generation of the solar cell E _1. Common connection point between the collector terminal of the rechargeable battery E ₂ and the transistor Tr ₁ is connected to the load 3 via the series circuit of the external power supply connection portion 2 and the power switch SW. The external power supply connection unit 2 includes three connection terminals a, b, and c. The connection terminal a is connected to the power switch SW and the connection terminal b.
The common connection point between the tens and collector terminals of the transistor Tr ₁ of the rechargeable battery E _2, connecting terminals c are connected to ground. The connection terminal a and the connection terminal b is connected at the external power supply not connected, are connected to the solar cell E ₁ and the rechargeable battery E ₂ and the power switch SW. When an external power supply is connected, the connection between the connection terminal a and the connection terminal b is disconnected, and an external power supply (not shown) is connected to the power switch SW. The external power supply connection 2
Depending plug of the external power source removably, or the power to the load 3 to the external power source, the solar cell E ₁ or the rechargeable battery
And it has a change-over switch for switching whether to E _2. The power switch SW is a switch that is turned on when the motor is driven such as reproduction, recording, and fast-forward. Switching means 4 is disposed between said external power supply connection portion 2 and the common connection point between the power switch SW and the rechargeable battery E _2. The switching means 4 comprises a transistor Tr _3, the emitter terminal via a resistor R ₅ to the common connection point of the external power supply connection portion 2 and a power switch SW, a base terminal of the diode D ₄ and a resistor R ₆ The collector terminal is connected to the ten terminals of the solar cell E ₁ through the series circuit and the rechargeable battery E ₂
Respectively connected to the ten terminals. The load 3 is mainly driven by a motor for running the tape, and requires a terminal voltage of, for example, 1.2 V to 1.5 V. When an AC power supply is used as an external power supply for the external power supply connection section 2 via an AC adapter, the AC adapter (here, 1.8
When the plug of V) has been connected, thereby also conducts transistor Tr ₃ and transistor Tr ₄ is rendered conductive. A DC power source, that is, a dry battery (for example,
When the connection plug from 1.5V) is connected, the transistor Tr ₄ is thereby transistor Tr ₃ also non-conducting in non-conductive. Further, when the solar cell E ₁ generates power when the transistor Tr ₃ is conductive, non-conductive the transistor Tr ₃ flows to the base terminal of the transistor Tr ₃ the generated current through the resistor R ₆ and the diode D ₄ To Moreover, the serially connected circuit of a resistor R ₇ and the resistor R ₈ is between the common connection point and ground and the external power supply connection portion 2 and a power switch SW, the common resistor R _7, R ₈ of the both the base terminal of the transistor Tr ₄ is connected to the connection point. The collector terminal of the transistor Tr ₄ is the common connection point between the base terminal and the diode D ₄ of the transistor Tr ₃ via a resistor R _9, emitter terminals are connected to ground. Transistor Tr ₄ is prevented even discharge of the rechargeable battery E ₂ in the non-power generation of the transistor Tr ₂ in the same manner as in the solar cell E _1. Switching means 5 is intended to apply an electromotive force of the solar battery E ₁ while bypassing the current limiter unit 1 when the battery E ₂ is empty on the load, three transistors Tr _5, Tr _6, It is equipped with a Tr _7. The common connection point of the transistor Tr ₅ is a power switch SW and the load 3 via the collector terminal resistor R _10, a base terminal distribution between the common connection point and ground and the external power supply connection portion 2 and a power switch SW The emitter terminal is connected to the ground at the common connection point of the two series resistors R ₁₁ and R ₁₂ . The transistor Tr ₆ has a collector terminal connected to the base terminal of the transistor Tr ₇ described below via the resistor R ₁₃ , a base terminal connected to a common connection point between the collector terminal of the transistor Tr ₅ and the resistor R _10, and an emitter terminal connected to ground. It is connected. Transistor Tr ₇ is the common connection point of the solar cell E ₁ emitter terminal via the resistor R ₁₄ and the resistor R _6, to the common connection point of the collector terminal and the collector terminal of the transistor Tr ₁ and the battery E ₂ It is connected. When the power switch SW is not connected to an external power source to the external power supply connection portion 2 off, with the transistor Tr ₅ is non-conductive, the switching means makes the transistor Tr ₇ no voltage is applied to the base terminal of the transistor Tr ₆ is non-conductive 5 is off. Also, when the power switch SW is of the external power supply to the external power supply connection portion 2 is connected off, transistor Tr ₅ is in the conducting,
Switching means 5 transistor Tr ₇ becomes non-conductive the transistor Tr ₆ voltage is the voltage of the row is applied to the base terminals are nonconductive of the transistor Tr ₆ is turned off. And Thus, the transistor Tr ₇ is the switching means 5 becomes nonconductive off transistor Tr ₆ irrespective to an external power source connection and non-connection to an external power supply connection portion 2 is non-conductive when the power switch SW is turned off . Also, when the power switch SW is an external power supply to the external power supply connection portion 2 on-connected becomes conductive in accordance with the resistance division ratio of the transistor Tr ₅ is resistance-divided R11, R12, transistor transistor Tr ₆ are in non-conducting Tr ₇ becomes non-conductive and switching means 5 is turned off. If the solar cell E ₁ external power to the external power supply connection portion 2 power switch SW is on is in a disconnected when the battery E ₂ is empty is in the power generation state, the power generation voltage of the solar cell E ₁ is the current limiter means 1, external power supply connection 2, power switch SW, resistor R10
Conducting transistor Tr ₆ is applied to the base of the transistor Tr ₆ via the switching means 5 and conducts the transistor Tr ₇ is configured to be turned on. On this occasion,
The generated current of the solar cell E ₁ is the rechargeable battery E ₂ and the power switch SW
Because it is supplied to the load 3 via the voltage at the connection terminal a of the external power supply connection portion 2 is not in the voltage of only turning on the transistor Tr _5. Also, when in the solar cell E ₁ is the power generation state in the external power supply connection portion 2 to the external power supply is disconnected the power switch SW is on when the predetermined value or more power storage condition that the rechargeable battery E _2, battery E ₂ voltage configured to causes the conducting transistor Tr ₅ by resistance division ratio of the resistance division R11, R12 through the external power supply connection unit 2, the switching means 5 becomes transistor Tr ₇ is non-conductive in the transistor Tr ₆ is non-conducting is turned off Have been. Hereinafter, the operation of the power supply circuit of the tape recorder will be described. First, when an external power supply is not connected to the external power supply connection unit 2,
That is, a case where an external power supply is not connected will be described. When the power switch SW is turned off, electricity in the rechargeable battery E ₂ is charged through the current limiter unit 1 when the solar cell E ₁ is the power generation. If battery E ₂ is the solar cell E ₁ with the external power source is not connected to an external power supply connection portion 2 power switch SW is turned on in an empty state is in a power generating state, the solar cell switching means 5 is turned on
Generated current E ₁ is flowed to the load 3 via the external power supply connection portion 2 and a power switch SW, bypassing the current limiter unit 1. Thus, the switching means 5 so current flows the path that is the current controlled by the current limiter unit 1 to the bypass and the load 3, the current that the rechargeable battery E ₂ to consumption of the load 3 in an empty state of the rechargeable battery E ₂ it can also operate the load 3 with only power generation of the solar cell E ₁ when greater than the allowable charging current. Further, if the solar cell E ₁ external power to the external power supply connection portion 2 power switch SW is turned on at a predetermined value or more storage state in disconnected with the rechargeable battery E ₂ is in the power generating state, the load from the solar cell E ₁ 3 current flows in the limit current limiter unit 1 is to, when the load 3 is current is required than the current limit of the current limiter unit 1 current shortfall from the rechargeable battery E ₂ is supplied to the load 3. Next, a case in which a DC power supply, that is, a connection plug from a dry battery (for example, 1.5 V) is connected to the external power supply connection unit 2 as an external power supply will be described. Regardless of the on / off state of the power switch SW, the switching means 4 is turned off depending on the connection of the dry battery, so that the rechargeable battery from a power source such as a dry battery having a finite life is used.
And it has a configuration such as to prevent the charging of the E _2. Therefore when the power switch SW is on, not in battery E ₂ current is supplied only to the load 3 from the battery is charged. Further, no current is supplied from the rechargeable battery E ₂ and the solar cell E ₁ to the load 3. At this time, when the solar cell E ₁ generates power,
Through the current limiter unit 1 generated current only the rechargeable battery E ₂ is supplied, the effective use of solar energy is achieved. Finally, connect the AC power to the external power connection 2 via the AC adapter.
A case where a power supply is used and a plug of an AC adapter (for example, 1.8 V) is connected will be described. When the power switch SW is turned off, electricity battery E ₂ through the switching means 4 by the transistor Tr ₄ is charged when the solar cell E ₁ is not generating power. In this case, when the solar cell E ₁ to generate electricity, the diode D _4, a resistor R _6, prevents the supply current from the external power source switching means 4 is turned off and flows in the battery E _2, solar cell E ₁ Of the rechargeable battery E ₂ through the current limiter 1
Is charged. Power generation current of the solar cell E ₁ with the maximum permissible current or more current does not flow through the battery E ₂ is achieved effective use of charged solar energy. When the power switch SW is on, the transistor with when the solar cell E ₁ is not generating a current to the load 3 differs from the when connecting the DC power supply (e.g., 1.5V) flows
The switching means 4 is turned on by Tr ₄ and the current is
Also supplied to the rechargeable battery E ₂ flows into _two. Also at this time, when the solar cell E ₁ generates power, the switching means 4 is turned off by the diode D ₄ and the resistor R ₆ , and the power is supplied from an external power supply (for example, 1.8 V).
Of no longer the charging of the rechargeable battery E ₂ by the power source, it flows instead to the battery E ₂ generated current through the current limiter unit 1 of the solar cell E _1. Therefore, the power generation current of the solar cell E ₁ with the maximum permissible current or more current does not flow is the effective use of charged by solar energy to the rechargeable battery E ₂ is achieved in the rechargeable battery E _2. In this embodiment, depending on the magnitude of the external power supply voltage (1.5 V DC power supply, 1.8 V AC power supply) connected, a DC power supply such as a dry battery, which is a power supply with a finite external power supply, and a power supply with an infinite power supply life was controlled switching means 4 and the AC power is then identified by the transistor Tr _4, not limited to this, identifying the connection between the DC power supply and AC power by other means, on the switching means 4, Off control may be performed. [Effects of the Invention] As described above, according to the present invention, a solar cell is connected to the solar cell, and the generated current from the solar cell is regulated in accordance with the generated voltage from the solar cell. And a rechargeable battery connected to the solar cell via the current limiter means, and a current-regulated current supplied from the current limiter means being supplied via the current limiter means. And a load where the rechargeable battery and the solar cell are connected via a power switch, and a current from the rechargeable battery or the solar cell is supplied via a power switch,
The rechargeable battery is connected in parallel with the current limiter means, is turned on in a state where the rechargeable battery is at a predetermined voltage or less, and the power switch is turned on, and the generated current of the solar cell bypasses the current limiter means to load the load. And the rechargeable battery is turned off in a state where the power switch is off, and the generated current from the solar cell is supplied to the rechargeable battery via the current limiter means. Switching means for controlling the flow of electricity, when the power switch is off, when the solar cell generates electricity, electricity is stored in the rechargeable battery via the current limiter means, and when the power switch is on, The power generated by the solar cell or the power from the rechargeable battery is supplied to the load. At this time, when the rechargeable battery is empty, the electricity from the solar cell is a current limiter. Since the power is supplied to the load through the switching means, bypassing the stage, solar energy is effectively used. In addition, when the power switch is on and the rechargeable battery is empty, a sufficient current can be supplied to the load by fully supplying the generated current of the solar cell to the load. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a power supply circuit diagram of a tape recorder showing an embodiment of the present invention. E ₁ … solar cell, E ₂ … rechargeable battery, SW… power switch, 3… load.

Claims (1)

(57) [Claims] A solar cell, connected to the solar cell, and corresponding to a voltage generated from the solar cell, a current limiter for regulating a current generated from the solar cell; and A rechargeable battery connected to a battery and supplied with current-regulated current supplied from the current limiter means via the current limiter means, the rechargeable battery and the solar cell connected via a power switch And a load to which current from the rechargeable battery or the solar cell is supplied via a power switch, and the load is connected in parallel with the current limiter means, the rechargeable battery is at a predetermined voltage or less, and the power switch Is turned on in the on state, so that the generated current of the solar cell flows to the load, bypassing the current limiter means. The control is performed so that the rechargeable battery is at a predetermined voltage or less, and the power switch is turned off when the power switch is off, so that the generated current from the solar cell flows to the rechargeable battery via the current limiter. A power supply circuit comprising: