JPH0313997Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (industrial application field) This invention relates to a portable emergency light. More specifically, the plug blade provided on the back of this emergency light is usually inserted into an outlet installed in a hallway, etc.
In addition to charging, it can also be used as a night light, and in the event of a power outage, it lights up brightly, and the plug blade of this emergency light can be removed from a wall outlet, making it a portable emergency light.

(Prior art) Figure 1 shows a well-known conventional example.
The plug blades A and A are provided on the back side of the emergency light and can be inserted into an outlet provided on the wall. E is a power supply unit connected to a commercial power source through the plug blades A and A, and has a built-in full-wave rectifier circuit. B is
It is a storage battery and is charged from the power supply section E.
D is a power failure detection circuit in which current flows from the storage battery B to the control pole G of the thyristor SCR at the same time as a power failure occurs, and the thyristor SCR is driven to drive the transistor to which the lamp L is connected.

In addition, Utility Model No. 55-22718 "Power Outage Light" is equipped with a charging plug that can be retracted and retracted at will, and a resistor is connected in series to the lamp during normal times, and in the event of a power outage, a relay contact connected in parallel to the power supply is used. A portable emergency light is shown that connects the lamp directly to the battery (without a resistor).

Furthermore, in Jitsugoku No. 49-40770 “Outage Light”,
In the event of a power outage, the lights will automatically turn off after being lit for a few seconds to several tens of seconds, minimizing wasted battery consumption, and at the same time, a switch will be installed to turn the lights on regardless of whether the lights are turned off automatically or not. This is a power outage light with a structure that allows it to continue operating.

(Problems to be Solved by the Invention) In the conventional example shown in Figure 1, the lamp L is either turned on at full brightness or turned off, and is used as a night light to keep your feet at night. It was not possible to obtain a lighting condition with low illuminance to illuminate the area.

In addition, in the case of Utility Model Publication No. 55-22718, when normally used as a night light, a resistor is connected in series to the circuit, and the voltage is lowered by this resistor (that is, power is consumed by the resistor), resulting in low output. In other words, the illuminance is low. Therefore, not only is electric power was wasted, but the heat generated by the electric power generates unnecessary anxiety, which is a drawback.

Furthermore, in the case of Utility Model Publication No. 49-40770, not only can it not be used as a night light under normal conditions, that is, low illuminance, but it also turns off after a certain period of time after a power outage. If you do not reach the emergency light during the lighting duration, you will not know where the emergency light is located, and there is a risk that it will not function as an emergency light at all.

The present invention provides a portable emergency light that eliminates the drawbacks of the prior art described above.In normal times, the plug blade provided on the back of the emergency light is inserted into a wall outlet, and the light is charged and the light is kept low. It can be turned on depending on the illuminance, and can be used as a night light to illuminate your feet at night.In the event of a power outage, it can be fully lit and used as a portable emergency light.Furthermore, when used as a night light, the voltage can be lowered with a resistor.
The purpose is to provide a portable emergency light that does not generate heat.

B. Structure of the invention (means for solving problems) The portable emergency light of the invention will be explained in detail with reference to FIG.

1, 1 is a plug blade provided on the back side of this portable emergency light. 2 is a DC power supply, which includes a diode bridge 3 and a smoothing capacitor C. Consists of. 4 is a step-down circuit for keeping the voltage applied to the subsequent circuit low; if the pulsating voltage exceeds the Zener voltage of the Zener diode ZD, the current i. flows, a voltage is applied to the gate G of the thyristor SCR1, it becomes conductive, the base of the transistor Tr3 is grounded, and no voltage is supplied to the subsequent circuits. 5 is a storage battery. 6 is a lighting circuit for the lamp L. This lighting circuit connects the collectors of two transistors Tr1 and Tr2 to the lamp L, and the other end is connected to the negative side of the power supply. Bases B1 and B2, which are control poles of these transistors Tr1 and Tr2, are controlled by a control circuit 7. The control circuit 7 detects a power outage and turns on the transistor.
It consists of a power failure detection circuit 8 that drives Tr1, a night light starting circuit 9, and a cutoff circuit 10. The power failure detection circuit 8 connects a connection point a divided by resistors r1 and r2.
is connected to the base of the transistor Tr4, and the collector is connected to the control pole G of the thyristor SCR2, which supplies voltage to the base B1 of the transistor Tr1, through a capacitor C2. Next, the night light starting circuit 9 supplies the voltage of the control pole G3 of the thyristor SCR3, which supplies the voltage to the base 2 of the transistor Tr2, via the manual switch S1.

The base-emitter voltage of the transistor Tr2 is set to be lower than the base-emitter voltage of the transistor Tr1. Further, the cutoff circuit 10 connects the control poles G2 and G3 of the thyristors SCR2 and SCR3, which supply voltage to the bases of the two transistors Tr1 and Tr2 of the lamp lighting circuit 6, to the negative side of the power supply by a switch S2 via diodes D1 and D2. It is connected to.

(Function) The structure is as described above, and when this emergency light is installed by inserting the plug blades 1 and 1 into an outlet installed on the wall, if there is a commercial power source, the resistance r
Since the base of the transistor Tr4 is connected to the connection point a of 1 and r2, it is in a conductive state, and the control pole G of the thyristor SCR2 is grounded, so that the thyristor SCR2 is in a non-conductive state.

When the commercial power supply fails, the transistor Tr4 becomes non-conductive, so current flows from the storage battery B through the capacitor C2 and the resistor Tr4, so a voltage is applied to the control pole G of the thyristor SCR2, which becomes conductive, and the transistor Tr1 becomes conductive. becomes conductive and lamp L is fully lit. Next, when commercial power is present, if the starting switch S1 is closed, that is, when used as a night light, the current i3 flows through the diode D3, the resistor r6, the diode D4, and the resistor r7.
, the thyristor SCR3 becomes conductive, the current i4 flows, and the base B2 of the transistor Tr2
A voltage is applied to it and it becomes conductive. However, the voltage Vbe between the base and emitter of transistor Tr2 is equal to the voltage across resistor r8, but transistor Tr2
Since emitter point B of 2 is connected to point d of one side, the voltage corresponding to the voltage drop across resistor r7 and resistor r9
It is equal to Vbe, and the transistor Tr1 and
Comparing the Vbe of Tr2, they are Vbe1 and Vbe2, and the conduction state of the transistor Tr2 is shallow, and the lamp L is lit, but it is not fully lit but is lit with low illuminance.

C. Effect of the invention As mentioned above, according to the invention of the present application, the commercial power source E
A DC power supply 2 that rectifies and smooths the input from the commercial power supply E, a step-down circuit 4 that steps down the output of the DC power supply 2 and supplies it to the storage battery 5, and a DC power supply 2 that can be connected to the commercial power supply E. In a portable emergency light equipped with an electric circuit section that detects a power outage and lights up the lamp, a storage battery 5 and a lamp lighting circuit 6 are provided.
a power failure detection circuit 8 that supplies current to the base of the transistor Tr1 of the lamp lighting circuit 6 to drive the transistor Tr1 by a thyristor SCR2 that detects a power failure and becomes conductive; and a thyristor that becomes conductive when the manually operated switch S1 is closed. SCR3
A night light starting circuit 9 supplies a current to the base of the transistor Tr2 of the lamp lighting circuit 6 to drive the transistor Tr2, and the lamp lighting circuit 6 connects the control poles of the thyristors SCR2 and SCR3 to ground. and a switch for turning off the transistor Tr1, which turns off the transistor Tr1.
The voltage between the base and emitter of the transistor
The voltage between the base and emitter of Tr2 is set higher than that of transistor Tr1, so that the conduction state of transistor Tr1 becomes a deeper conduction state, making it a portable emergency light. When used as a night light, a lighting state with low illuminance can be obtained.

Furthermore, when used as a night light, the voltage applied to the lamp is lowered to achieve low illuminance, which is achieved by varying the degree of conduction of the transistors, rather than lowering the voltage through the power consumption of a resistor. Because of this configuration, not only is power consumption low, but there is also no fear of giving the user unnecessary anxiety due to heat generated by the resistor.

What's more, when a power outage occurs, the system immediately switches to all lights on and continues to maintain all lights on, so even if you are unable to reach the certain position of the emergency lights immediately after a power outage, you can still use the emergency lights. There are excellent practical effects such as there is no fear that the location will be lost.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing a conventional example of the invention, and FIG. 2 is an electric circuit diagram showing an embodiment of the invention. 1...Blug blade, 2...Power supply device, 3...Diode bridge, 4...Step-down circuit, 5...Storage battery, 6
... Lamp lighting circuit, 7 ... Control circuit, 8 ... Power failure detection circuit, 9 ... Night light starting circuit, 10
...Break circuit.

Claims (1)

[Scope of utility model registration request] A plug blade that can be connected to a commercial power supply, a DC power supply that rectifies and smoothes the input from the commercial power supply, a step-down circuit that steps down the output of this DC power supply and supplies it to a storage battery, and a lamp that detects a power outage of the commercial power supply. In a portable emergency light, a storage battery, a lamp lighting circuit, and a thyristor SCR2 that detects a power outage and conducts electricity supply current to the base of a transistor Tr1 in the lamp lighting circuit. A power failure detection circuit that drives the transistor Tr1; and a night light starting circuit that drives the transistor Tr2 by supplying current to the base of the transistor Tr2 of the lamp lighting circuit using the thyristor SCR3, which is made conductive by closing the manually operated switch S1. , the thyristor SCR2, SCR
A light-off switch S ₂ connects the control pole of No. 3 to ground and puts the lamp lighting circuit into a non-conducting state.
A portable emergency light comprising: a voltage between the base and emitter of the transistor Tr1 is higher than a voltage between the base and emitter of the transistor Tr2.