JPS6112358B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a checker for an emergency light built into, for example, an emergency light.

[Background technology]

Emergency light checkers are used to check whether emergency lights used in emergencies such as commercial power outages or fire outbreaks can remain lit normally for a specified period of time. This system creates an emergency situation, turns on the emergency lights, and if the normal lighting status is exceeded within a certain period of time, an indicator light is used to indicate that the situation is not normal. Normally, whether or not this is normal is determined after a certain period of time has passed from the start of the inspection.
The judgment is made based on whether or not the storage battery that serves as the emergency power source maintains a voltage value above a certain level. Although this method is effective when using simple items such as incandescent lamps as the emergency lighting load, When the load is a complex circuit that uses a high-frequency inverter that includes transistors and thyristors to turn on fluorescent lights at high frequencies, there may be a failure in the inverter and the emergency lights may not turn on properly even if the storage battery is normal. In such cases, there was a drawback that the desired detection could not be made.

[Purpose of the invention]

The purpose of this invention is to provide an emergency light that uses a high frequency inverter to turn on a fluorescent light in an emergency.
The objective is to provide an effective inspection method.

[Disclosure of the invention]

The emergency light checker of this invention connects a high-frequency inverter to both ends of a storage battery through contacts that close in an emergency, turns on a fluorescent light through a high-frequency current-limiting impedance, and forcibly turns on a fluorescent light equivalent to that in an emergency. A voltage detecting means for detecting a voltage proportional to the voltage across a high-frequency current limiting impedance, a rectifying and smoothing means for rectifying and smoothing this voltage, which is used in an emergency light equipped with an inspection means for generating a state. a Schmitt circuit that inverts the output state when this rectified and smoothed voltage falls below the low operating point;
The display device includes display means that changes the display from inactive to active in response to the reversal of the output state of the Schmitt circuit, and a compensation circuit that constantly charges the capacitor of the rectifying and smoothing means to a level higher than the low operating point of the Schmitt circuit. It is characterized by

According to the configuration of the present invention, the high-frequency current-limiting impedance connected in series with the fluorescent lamp at the output end of the high-frequency inverter determines whether the fluorescent lamp serving as the emergency light source is in a state where it can be lit normally within a predetermined time. Since the inspection is performed by detecting the magnitude of the voltage of the fluorescent lamp, the detection input is accurately proportional to the tube current of the fluorescent lamp, and it can detect not only the deterioration of the capacity of the storage battery that serves as an emergency power source, but also the failure of the high frequency inverter and the fluorescent lamp. It is possible to detect and display all the causes of abnormal fluorescent lamp lighting, such as end-of-life conditions.

In addition, since the capacitor of the rectifying and smoothing means is normally charged to a value higher than the threshold value of the Schmitt circuit, the operation of the Schmitt circuit cannot be started, for example, when an inspection is started when a fluorescent lamp is not lit for commercial use. Even when the output of the voltage detection means is delayed due to a delay in the lighting of the fluorescent lamps, the input voltage to the Schmitt circuit can be maintained above the low operating point, reliably preventing malfunctions at the start of inspection. be able to.

Embodiment FIG. 1 is a circuit diagram of an emergency light to which the present invention is applied. In Figure 1, the regular lighting lamp is fluorescent lamp 1.
and a check coil 2, and is connected to a commercial power source 5 via an inspection means 4 consisting of a regular lighting lamp blinking switch 3 and an inspection switch. Emergency lighting consists of a charging circuit and an emergency lighting main circuit.
The charging circuit includes a power transformer 6, a rectifier 7, and a current limiting resistor 8, and has an input end connected to a commercial power source 5 via an inspection means 4, and an output end connected to a storage battery 9, which will be described later. The emergency light main circuit uses a fluorescent lamp 1, which is a commercial light source, as an emergency light source, and includes a storage battery 9, a high frequency inverter 10, and
A power failure detection relay 11, a storage battery 9 and a high frequency inverter 10 are connected in parallel with the input end of the charging circuit.
The normally closed contact 12 of the power failure detection relay 11 provided between
It consists of contacts 13 and 14 for switching between the two sides. Here, the high frequency inverter 10 includes a switching transistor 15 and an output transformer 16.
and high frequency impedance 1 of capacitors etc.
It is formed including 7. The emergency light checker has a primary winding 26 of a voltage detection means 25 consisting of a transformer connected to both ends of the high frequency current limiting impedance 17 of the high frequency inverter 10, and a rectifier 28 provided in the secondary winding 27. A compensation circuit 34 including a tertiary winding 32 of the power transformer 6 of the charging circuit and a rectifier 33 at both ends of the tertiary winding 32 is provided, and these are connected via diodes 35 and 36 for mutual interference prevention, and are connected to a resistor 29 as a common smoothing element. It is connected to capacitor 30. In this case, the rectifier 28, the resistor 29, and the capacitor 30 constitute a rectifying and smoothing means 42. Further, the operating voltage of the emergency light checker is set to V ₀ with respect to the voltage detected by the high frequency current limiting impedance 17 of the high frequency inverter 10 during normal lighting, which is permissible for the fluorescent light 1 serving as the emergency light source. There is.

And, this emergency light checker has contact point 1.
A Zener circuit 37 is provided at both ends of the battery 18 via a zener circuit 9, and a control transistor 38 and a switching transistor 39 are provided at both ends of the Zener circuit 37, and a display means 21 such as a light emitting diode is connected in series with the switching transistor 39 as a load. circuit 40
Connect the control input to the smoothing capacitor 3
0, the voltage across both ends is V ₃₀ , and the low operating point V _L is V ₀
The high operating point is set sufficiently higher than the voltage supplied from the compensation circuit 34.

In the emergency lights configured in this way, during general use, when the commercial power is on, the regular lighting lamps operate and the fluorescent lamp 1 lights up, and when the commercial power is turned on, the regular lighting lamps stop operating and the emergency lighting is turned on. In the lamp main circuit, contact 12 of power failure detection relay 11 closes, contact 1
3 and 14 are switched, the fluorescent lamp 1 is turned on by the high frequency inverter 10, and emergency lighting is provided.

When checking the function of the emergency light main circuit,
As shown in Figure A, the commercial AC is turned off by opening the inspection means 4 at time _t1 to artificially cause a commercial power outage in the circuit. When a commercial power outage occurs, contact 1
The high frequency inverter 10 is connected to the storage battery 9 through the high frequency inverter 10, the high frequency inverter 10 is activated, and high frequency tube current is supplied to the fluorescent lamp 1 through the high frequency current limiting impedance 17, so that the fluorescent lamp 1 is turned on in an emergency.
The voltage across the high frequency current limiting impedance 17 is detected by the primary winding 26 of the voltage detection means 25, and the secondary winding 27 receives a high frequency voltage V proportional to the voltage V ₁₇ of the high frequency current limiting impedance 17. ₂₇
appears and forms the detection input of the emergency light checker V. This voltage V ₂₇ is rectified by a rectifier 28 and smoothed by a resistor 29 and a capacitor 30, and a voltage V ₃₀ of the capacitor 30 is applied between the base and emitter of a transistor 38. Voltage V ₁₇
appears in proportion to the tube current of the fluorescent lamp 1. Therefore, when the voltage of the storage battery 9 is high at the beginning of an artificial power outage, the tube current is large, and therefore the voltage _V27 is as shown in Figure 2 (b). Since the operating voltage V ₀ of the control transistor 38 is sufficiently higher than the operating voltage V 0 of the control transistor 38 and the voltage V ₃₀ across the capacitor 30 is also sufficiently higher than the low operating point V _L of the Schmitt circuit 40, the control transistor 38 is in a conductive state. When the switching transistor 39 is in a non-conducting state, the light emitting diode 21
is off.

The voltage V ₂₇ decreases, and at time t ₂ before the inspection end time t ₃ , the voltage V ₃₀ becomes below the low operating point V _L as shown in (b). The switching transistor 39 changes from a non-conducting state to a conducting state via the control transistor 38, and current is supplied to the display means 21, and a luminous display is performed as shown in C. However, when the inspection ends at time _t3 , the fluorescent light is turned off. Even if the lamp 1 is turned on by the commercial power supply 5 and the voltage V ₁₇ becomes zero, the voltage supplied from the compensation circuit 34 is not higher than the high operating point, so the Schmitt circuit 4
0 operation is maintained, and the luminescent display of the display means 21 is memorized and maintained even after the inspection is completed, making it easy to confirm the results after the inspection. At this time, the emergency light checker V,
Not only the insufficient capacity of the storage battery 9, but also the case where the tube current is insufficient due to a failure of the high frequency inverter 10 or the end of the life of the fluorescent lamp 1 are detected and displayed in the same manner.

In addition, if you start an inspection when the regular lighting lamp blinking switch 3 is open and the fluorescent lamp 1 is not turned on for commercial purposes, it will take a little time for the emergency lighting of the fluorescent lamp 1 to start, and although it is instantaneous, the high frequency There are cases where no voltage appears on the current limiting impedance 17. In such a case, no voltage appears in the secondary winding 27 of the voltage detection means 25, and the detection input of the circuit tries to become lower than the operating voltage V ₀ , but the compensation circuit 34 smooths it when the commercial power is turned on before starting the inspection. Since charge is stored in the capacitor 30, the input voltage of the Schmitt circuit 40 is held at or above the low operating point _VL for a predetermined period of time and is not inverted.
After an instant, the fluorescent lamp 1 is turned on in an emergency, thereby allowing the desired inspection state to be entered. That is, the compensation circuit 34 has the function of delaying the detection operation by the Schmitt circuit 40 for a predetermined period of time. In this circuit, the Schmitt circuit 40 that maintains the light emitting state of the display means 21 is connected to the switch 41.
By short-circuiting the base and emitter of the switching transistor 39 for a moment, the switching transistor 39 is reset to non-conductive state and prepared for the next inspection.

In the embodiment, a light emitting diode was used as the display means 21, but it goes without saying that other display elements may be used as long as they have an excellent display effect that provides sufficient brightness with a relatively small current. .

〔Effect of the invention〕

According to the emergency light checker of the present invention, a high-frequency checker connected in series with the fluorescent light to the output end of a high-frequency inverter can check whether the fluorescent light serving as an emergency light source is in a state where it can be lit normally within a predetermined time. Since the inspection is performed by detecting the voltage of the current-limiting impedance, the detection input is accurately proportional to the tube current of the fluorescent lamp, and it is possible to detect not only the deterioration of the capacity of the storage battery that serves as an emergency power source, but also the capacity of the high-frequency inverter. It is possible to detect and display all the causes of abnormal lighting of the fluorescent lamp, such as malfunctions and end-of-life conditions of the fluorescent lamp.

In addition, since the capacitor of the rectifying and smoothing means is normally charged to a value higher than the threshold value of the Schmitt circuit, the operation of the Schmitt circuit cannot be started, for example, when an inspection is started when a fluorescent lamp is not lit for commercial use. Even when the output of the voltage detection means is delayed due to a delay in the lighting of the fluorescent lamps, the input voltage to the Schmitts circuit can be maintained above the low operating point, reliably preventing malfunctions at the start of inspection. can do.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an emergency light using an embodiment of the present invention, and FIG. 2 is an explanatory diagram of its operation. 1...Fluorescent lamp, 4...Inspection means, 9...Storage battery, 10
...high frequency inverter, 12...contact, 17...current limiting impedance for high frequency, 21...display means, 25...
Voltage detection means, 4... Compensation circuit, 40... Schmitt circuit, 42... Rectification and smoothing means, V... Emergency light checker.

Claims (1)

[Claims] 1 A high-frequency inverter is connected to both ends of the storage battery through contacts that close in an emergency, and a fluorescent lamp is turned on through a high-frequency current limiting impedance, and a check means is provided that forcibly generates a state equivalent to an emergency. It is used in emergency lights, and includes a voltage detection means for detecting a voltage proportional to the voltage across a high frequency current limiting impedance, a rectification and smoothing means for rectifying and smoothing this voltage, and a rectification and smoothing means for rectifying and smoothing this voltage. a Schmitt circuit that inverts its output state when A checker for emergency lights characterized by comprising a compensation circuit that charges the circuit above its low operating point.