JPS63118913A - Stabilized power unit - Google Patents

Abstract

PURPOSE:To cut off a power source automatically and to reduce power consumption, by detecting the fact that the operation of an equipment is stopped for a time exceeding a prescribed time, and stopping the function of a reference voltage generating element. CONSTITUTION:By connecting a power source switch 41 to a terminal 1a side, the charge current of a capacitor 5 flows on a constant voltage diode 3, and a reference voltage Vref is generated. When the reference voltage Vref is generated, a control transistor 4 is driven by the differential output of a differential amplifier 16, then, a prescribed voltage is outputted. The voltage is added on the constant voltage diode 3 via a resistor 7 and a diode 8. In such way, the Vref is maintained even after the charge current of the capacitor 5 is stopped, and an output voltage V0 is stabilized. When an operator stops the operation of the equipment, the output signal of a detection circuit 10 goes from '1' to '0', and a timer 11 is triggered, and when a period while the equipment is not operated exceeds the set time of the timer, a switching element 12 is closed at the time of completing a timer period, and the transistor 4 is cut off, then, the reference voltage Vref disappears.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a regulated power supply device with self-0FFIN capability.

[Prior Art] A conventional stabilized power supply device controls a control transistor using the output of an error amplifier.

[Problems to be Solved by the Invention] By the way, this type of conventional stabilized power supply device continuously outputs voltage unless the power switch is turned off.
Depending on the type of equipment to which the output of this power supply device is supplied, the following inconveniences may occur.

That is, for example, if the above-mentioned device is a radio-controlled transmitter for operating construction machinery such as a bulldozer or power shovel, the above-mentioned power supply device will stabilize the voltage of the battery, but the above-mentioned power switch will be turned off. If forgotten, the battery voltage will drop and the transmitter will no longer be able to operate.

[Means for Solving the Problems] In devices such as the radio-controlled transmitter described above, lever operations and switch operations are always performed within a certain period of time when the device is used. The present invention focuses on this point, and provides a stabilized power supply device that controls a fault control transistor using the output of an error amplifier, and includes a power switch interposed between a DC voltage source to be stabilized and a control transistor, and a power switch interposed between a DC voltage source to be stabilized and a control transistor. A capacitor that is charged by the DC voltage source when the power switch is turned on and supplies the charging current as an initial current to the base Q voltage generating element, and a voltage that supplies the output voltage of the control transistor to the reference voltage generating element. a supply path, an operation state detection means for detecting whether or not the device to which the output voltage is applied is being operated, and an operation state detection means for detecting that the operation has been stopped for a certain period of time or more based on the output of the operation state detection means. and means for detecting and stopping the function of the reference voltage generating element.

[Function] When it is detected that the operation of the device has been stopped for a certain period of time or more, the function of the reference voltage generating element is stopped, thereby causing the output voltage of the control transistor to drop.

[Example] The present invention will be described in detail below with reference to the drawings.

The figure shows self-OFFg! ! Safety 1a according to the present invention with functions
is connected to the anode of the battery 2, and the other terminal 1b is connected to the cathode of a constant voltage diode 3 serving as a reference voltage source. Further, the common terminal 1C of this switch 1 is connected to the emitter of the control transistor 4.

A capacitor 5 and a resistor 6 are connected in series between the terminal 1C of the switch 1 and the cathode of the voltage regulator diode 3, and a capacitor 5 and a resistor 6 are connected in series between the collector of the control transistor 4 and the cathode. A resistor 7 and a diode 8 are interposed.

This embodiment is applied to a device that requires operation by an operator, such as a radio-controlled transmitter for operating construction machinery (for example, a power shovel, a bulldozer), and when the device is the above-mentioned radio-controlled transmitter, the load 9 is It means a transmission circuit etc. for this transmission.

The operation state detection circuit 10 detects that the n device is being operated, and in the case of the above-mentioned radio control transmission, detects that the operation stick or switch is being operated based on their output signals. do.

Note that this detection circuit 10 outputs a signal of logic level "1" when detecting the above operation.

The timer 11 operates when the output signal of the operation state detection circuit 10 is “
It is triggered when the change from '1' to '0', that is, when the above-mentioned operation is stopped, and a certain period of time t (for example, 60 seconds) is counted.

This timer 11 is a so-called retrigger type timer, and outputs a signal of logic level "1" after the timer ends. Incidentally, this timer 11 is constituted by, for example, a re-1-rega type monostable multivibrator.

The normally open switch element 12, which is made of a transistor or the like, is closed by the output of the timer when the timer 11 finishes counting while the operation state detection circuit 10 has not detected any operation state; In this case, the cathode of the voltage regulator diode 3 is grounded via the diode 13.

The operation of this embodiment will be explained below.

When the power switch 41 is turned on to the terminal 1a side, the charging current of the capacitor 5 flows to the constant voltage diode 3.
A reference voltage Vref is generated across the constant voltage diode 3.

When this reference voltage Vref is generated, the transistor 14
．． The control transistor 4 is driven by the error output of the differential type error amplifier 16 consisting of 15, and a predetermined voltage is output from the transistor. This voltage is then applied to the constant voltage diode 3 via the resistor 7 and diode 8. Therefore, the capacitor 5
Even after the charging current stops, the reference voltage Vref continues to be generated, thereby stabilizing the output voltage Vo of the control transistor 4.

If the operator stops operating the operation stick, etc., the output signal of the detection circuit 10 changes from "1" to "0".
, the timer 11 is triggered. and,
After that, if the operation of the operating stick etc. does not wait for a time longer than the set time t of the timer 11, the switch element 12 is closed when the timer 11 finishes counting the time t.

When the switch element 12 is opened, the voltage regulator diode 3
Since the cathode of is grounded through the diode 13,
The transistor 14 constituting the error amplifier 16 is almost in a cut-off state, and as a result, the control transistor 4
is almost in a cut-off state, and its output voltage Vo becomes almost zero.

When the output voltage Vo drops to almost zero, the current that had been flowing to the voltage regulator diode 3 via the resistor 7 and diode 8 stops, so the reference voltage Vref disappears, and from then on, the output of the control transistor 4 Voltage Vo maintains a substantially zero state.

It should be noted that if the operation stick or the like is repeatedly operated at a cycle shorter than the set time t of the timer, the timer 11 is retriggered each time the operation is performed, so that the switch element 12 is not closed. Furthermore, even if the timer 11 times up, if the operation stick etc. is being operated at that time, the switch element 12 will be activated by the action of the AND circuit 17.
is not closed.

Thus, according to this embodiment, if the operation stick, etc. is not operated within the set time of the timer 11 after the operation of the operation stick, etc. is stopped, the output voltage of the control transistor 4 is automatically reduced to zero voltage. The power supply to the load 9 can be stopped by descending to a nearby location. Therefore, even if the user forgets to turn off the power switch 1, wasteful consumption of the battery 2 can be prevented.

When the operator performs the operation again, it is sufficient to switch the power switch 1 to the terminal 1b side and then turn the switch 1 to the terminal 1a side. In other words, connect power switch 1 to terminal 1.
When switched to the b side, the capacitor 5 is discharged via the switch 1, so by switching the switch 1 to the terminal 1a side again, the charging current of the capacitor 5 is applied to the voltage regulator diode 3, and the voltage is regulated. Voltage operation can be started again.

In addition, although the differential type error amplifier 16 is used in the above embodiment, the error amplifier is not limited to the differential type.

Furthermore, the present invention can be effectively applied not only to radio-controlled transmitters but also to other devices that involve lever operations and the like.

[Effects of the Invention] As described above, according to the present invention, when it is detected that the operation of the device to which the present invention is applied has been stopped for a certain period of time or more, the function of the reference voltage generating element is stopped. I can do it. Therefore, even if the user forgets to turn off the power switch after the operation of the i-device is completed, the power is automatically turned off, thereby preventing wasteful power consumption.

[Brief explanation of the drawing]

The drawing is a circuit configuration diagram showing an embodiment of a stabilized power supply device according to the present invention. DESCRIPTION OF SYMBOLS 1... Power switch, 2... Battery, 3... Constant voltage diode, 4... Control transistor, 5...
・Capacitor, 6.7... Resistor, 8... Diode, 9... Load, 10... Operation status detection circuit, 11.
...Timer, 12... Switch element, 13... Diode, 16... Error amplifier.

Claims (1)

[Claims] A stabilized power supply device that controls a control transistor using the output of an error amplifier, comprising: a power switch interposed between a DC voltage source to be stabilized and the control transistor; and a power switch that controls the power switch. a capacitor that is sometimes charged by the DC voltage source and supplies the charging current as an initial current to the reference voltage generation element; a voltage supply path that supplies the output voltage of the control transistor to the reference voltage generation element; an operation state detection means for detecting whether or not a device to which an output voltage is applied is being operated; A stabilized power supply device comprising means for stopping the function of a reference voltage generating element.