CN201116683Y - an emergency light - Google Patents

Abstract

The utility model discloses an emergency light, comprising a rectifier filter circuit connected to the mains, a half-bridge oscillator circuit and a charging circuit connected to the output of the rectifier filter circuit, an energy-saving lamp connected to the output end of the half-bridge oscillator circuit, a battery connected to the output end of the charging circuit, a connector connecting them together, an LED module mounted on the connector, and a light control circuit connected to the charging circuit, the battery, and the LED module, respectively. When the power grid is powered, the energy-saving lamp emits light and illuminates, and charges the battery at the same time. When the power grid is out of power and the ambient light is dim, the light is automatically converted to the LED module for illumination. The emergency light of this structure is light, energy-saving, easy to use, and most suitable for use as a ceiling light.

Description

an emergency light

technical field

The utility model relates to a lighting fixture, in particular to an emergency lamp used for lighting public aisles, indoor corridors and other occasions in areas where power grid blackouts often occur.

Background technique

In areas with tight power supply, emergency lights are often used as emergency lighting. Existing emergency lights are structurally composed of fluorescent tubes, step-down transformers, rectifying and filtering circuits, storage batteries, and high-frequency oscillating circuits. When the power grid has electricity, the power frequency power will charge the battery through the step-down transformer and the rectification and filtering circuit. Rely on the output power of the battery to make the fluorescent lamp continue to emit light. For this kind of emergency light, the power consumption of the fluorescent lighting of the fluorescent lamp is completely converted by the electric energy stored in the battery during the power outage, and the power consumption is large. Therefore, the lead-acid battery configured is heavy and large, which brings inconvenience and trouble to hoisting. In addition, in areas with frequent power outages, the voltage fluctuation range of the power grid is large, which will affect the normal charging of the battery in the emergency light, thereby shortening the service life of the emergency light.

Contents of the invention

The purpose of this utility model is to solve the volume and weight problems of existing emergency lights, and to provide an emergency light that is light in weight, reliable in lighting, high in lighting brightness when the power grid is on, and can automatically illuminate when the power grid is out of power, and is easy to install and use.

The utility model provides an emergency light with the following structure. The emergency light comprises: a rectification filter circuit whose input end can be connected with the mains, a charging circuit connected to the output end of the rectification filter circuit and a half-bridge The oscillating circuit, the storage battery connected to the output end of the charging circuit, an energy-saving lamp connected to the output end of the half-bridge type oscillating circuit, and a connecting body for putting them together. An LED module including several high-brightness light-emitting diodes, and a light control circuit respectively connected to the charging circuit, the storage battery and the LED module. When the power grid has power, the mains electricity will generate about 300V DC voltage at its output terminal through the rectification and filtering circuit. One way of the DC power will be ignited by the half-bridge oscillator circuit to light up the energy-saving lamps for lighting; the other way will be to charge the battery through the charging circuit. When the energy-saving lamp emits light, the ambient light is bright, and the light control circuit cuts off the electrical connection between the LED module and the battery, and the LED module does not emit light; when the power grid fails, the output terminal of the rectifier filter circuit has no voltage, and the half-bridge oscillates The circuit stops working, and the energy-saving lamp does not emit light. At this time, the ambient light is dark, and the light control circuit automatically connects the electrical connection between the LED module and the storage battery, and the LED module obtains an operating current to emit light.

The charging circuit includes: a switching transistor Q1, a pulse transformer T1, a protection transistor Q2, the collector of the switching transistor Q1 is connected to the output positive terminal of the rectification filter circuit through the primary winding N1 of the pulse transformer T1, and its emitter is The polar resistor R4 is connected to the output negative terminal of the rectifier filter circuit, the base resistor R3 and the capacitor C3 are connected in series, and connected between the base of the switching transistor Q1 and the feedback winding N3 end of the pulse transformer T1, and the regulator tube ZD1 and the capacitor C4 connected in series between the base of the switching transistor Q1 and the other end of the feedback winding N3 connected to the output negative end of the rectification and filtering circuit, and connected in parallel at the junction of the voltage regulator transistor ZD1 and capacitor C4 and the junction of capacitor C3 and the feedback winding N3 Connect a forward diode D6 to become the feedback network for the on/off intermittent oscillation of the switching transistor Q1; connect a start-up resistor R3 between the positive output terminal of the rectification filter circuit and the base of the switching transistor Q1; ground one end of the pulse transformer T1 A high-frequency rectification and filtering circuit is connected to the secondary winding N2 of the high-frequency rectification and filtering circuit. The output positive and negative terminals of the high-frequency rectification and filtering circuit are respectively connected with the positive and negative poles of the battery to charge the battery; the collector and emitter of the transistor Q2 are protected They are respectively connected to the base of the switching transistor Q1 and the output negative terminal of the rectification and filtering circuit, and the base of the protection transistor Q2 is connected to the emitter of the switching transistor Q1 to form an overcurrent protection circuit for the oscillation of the switching transistor Q1.

The light control circuit includes: a third triode Q3, a fourth triode Q4, a photosensitive resistor CDS and an auxiliary winding N4 magnetically coupled with the pulse transformer T1. One end of the auxiliary winding N4 is connected to the secondary pole of the pulse transformer T1. The remote end of the winding N2 is connected, and the other end is connected to the base of the third transistor Q3 of the PNP type through the forward rectifying diode D7, the forward diode D9, and the current limiting resistor R7, at the junction of the rectifying diode D7 and the diode D9 A and the grounded negative pole of the battery E1 are connected in parallel with a filter capacitor C6; the emitter of the third triode Q3 is connected to the positive pole of the battery E1; the LED module is connected across the collector and ground of the third triode Q3 On the emitter of the third transistor Q3, a base resistor R10 connected to the base of the fourth transistor Q4 is connected, and the emitter of the third transistor Q3 is connected to the fourth transistor Q3 through a load resistor R9 On the collector of the transistor Q4, a connection resistor R8 is connected in series between the collector of the fourth transistor Q4 and the base of the third transistor Q3, and at the same time, a photoresistor is connected across the fourth transistor The base of the tube and the emitter to ground.

After adopting the above-mentioned structure, when the power grid is powered, the energy-saving lamps are ignited to illuminate and charge the battery at the same time. When the power grid is out of power and the ambient light is dark, the power stored in the battery is used to make each light-emitting diode of the LED module Luminous lighting, because the working power consumption of the LED module is very low, the battery can use multiple small-capacity rechargeable single batteries, not only the overall weight is greatly reduced, but also the space in the connecting body can be used reasonably, so as to make light-weight The unique pendant emergency light provides convenience. Since the charging circuit adopts a DC-DC conversion circuit with intermittent pulse width automatic adjustment, this circuit can reduce the change of the DC output voltage caused by the fluctuation of the grid voltage, thereby ensuring the normal and safe charging of the battery and prolonging the service life of the battery; due to the setting With the addition of a light control circuit, when the power grid has a power change to a power outage, the luminous lighting of the energy-saving lamp can be automatically converted into the luminous lighting of the LED module. The lighting is reliable and easy to use.

Description of drawings

Fig. 1 is a schematic circuit diagram of an emergency light of the utility model.

Fig. 2 is a kind of specific structure schematic diagram of the utility model.

Detailed ways

As shown in Figure 1, the rectification filter circuit 1 is composed of four diodes D1, D2, D3, D4 and two filter capacitors C1a and C1b connected in series, wherein the input terminals L and N can be connected to the 220V mains; the filter capacitor C1a The contact point and the L terminal of the filter capacitor C1b can be connected with 110V mains to facilitate the use in different countries or regions. A half-bridge oscillating circuit 2 is connected to the output end of the rectification filter circuit 1, and an energy-saving lamp 3 is connected to the output end of the half-bridge oscillating circuit. When the grid has power, the mains power is rectified and filtered by the rectifier filter circuit 1, and a DC voltage of about 300V is formed between the positive terminal of the filter capacitor C1a and the negative terminal of the filter capacitor C1b, and the DC voltage is added to the half-bridge oscillator circuit 2 The input end causes the circuit to oscillate, and outputs tens of kilohertz of alternating current to ignite the energy-saving lamp tube 3 to emit light.

A charging circuit 4 is also connected to the output terminal of the rectifying and filtering circuit 1. The charging circuit is an intermittent pulse width automatic adjustment DC-DC conversion circuit, which includes a switching transistor Q1, a pulse transformer T1, and a protection transistor Q2. The collector of the switching transistor Q1 is connected to the positive end of the filter capacitor C1a through the primary winding N1 of the pulse transformer T1, and its emitter is connected to the negative end of the filter capacitor C1b through the emitter resistor R4, and the base resistor R3 and the capacitor C3 are connected in series. Between the base of the switching transistor Q1 and one end of the feedback winding N3 of the pulse transformer T1, the regulator diode ZD1 and the capacitor C4 are connected in series, and connected between the base of the switching transistor Q1 and the other end of the feedback winding N3 connected to the negative end of the filter capacitor C1b , and a forward diode D6 is connected across the junction of the voltage regulator transistor ZD1 and the capacitor C4 and the junction of the capacitor C3 and the feedback winding N3 to become a feedback network for switching on/off the intermittent oscillation of the switching transistor Q1. When the switching transistor Q1 starts to conduct, the collector current flowing through the primary winding N1 increases linearly, so that the feedback winding N3 generates an induced voltage whose upper end is positive and the lower end is negative, and the switching transistor Q1 obtains a forward bias and rapidly saturates. At this time, the induction current on the feedback winding N3 charges the capacitor C3. As the voltage on the capacitor C3 rises, the positive feedback voltage of the switching transistor Q1 gradually decreases, and the switching transistor Q1 starts to exit the saturation region, and flows through the collector of the primary winding N1. The electrode current begins to decrease, and the polarity of the induced voltage on the feedback winding N3 is reversed immediately, the polarity of which is negative at the upper end and positive at the lower end, and the switching transistor Q1 tends to be cut off due to negative feedback. At this time, the induced current generated by the feedback winding N3 charges the capacitor C4 through the diode D6, and the voltage on the capacitor C4 increases. The base-emitter of the transistor Q1 is applied with a reverse voltage, so that the switching transistor Q1 is quickly cut off.

A starting resistor R2 connected to the positive end of the filter capacitor C1a is connected to the base of the switching transistor Q1, and a high-frequency rectification and filter circuit composed of a diode D8 and a capacitor C5 is connected to the secondary winding N2 of the pulse transformer T1. The output positive terminal B of the rectification filter circuit is connected to the battery E1 through the current limiting resistor R5 to charge the battery. The accumulator can adopt 3 AA Ni-MH batteries, and of course also can adopt integral Ni-MH battery pack or lithium battery pack.

The collector and emitter of the protective transistor Q2 are respectively connected to the base of the switching transistor Q1 and the negative terminal of the filter capacitor C1b, and the base thereof is connected to the emitter of the switching transistor Q1. When some reason, such as the grid voltage is too high, or the emitter current of the switching transistor Q2 is too large at the moment of starting up, the emitter current causes the voltage drop on the emitter resistor R4 to exceed 0.65V, and the protection transistor Q2 is turned on immediately. The base-emitter voltage of the switching transistor Q1 becomes a negative value and cuts off quickly, thereby ensuring that the switching transistor Q1 is damaged by overcurrent. In addition, the circuit is equipped with an overvoltage protection measure composed of a diode D5, a capacitor C2 and a resistor R1.

In the above-mentioned charging circuit, due to the cooperative action of the stabilizing tube ZD1, the capacitor C4 and the diode D6 in the feedback network, the on/off oscillation of the switching transistor Q1 is an intermittent oscillation, and its on-time can not only be automatically adjusted with the charging current of the battery, Moreover, it can also make reverse changes according to the grid voltage fluctuation, so that the charging circuit can normally and reasonably charge the storage battery to prolong the service life of the storage battery.

The light control circuit 6 is connected with the charging circuit 4 and the storage battery. It includes a third triode Q3, a fourth triode Q4, a photosensitive resistor CDS and an auxiliary winding N4 magnetically coupled with the pulse transformer T1. The auxiliary winding The lower end 7 of N4 is connected to the remote end 6 of the secondary winding N2, and its other end 8 is connected to the base of a PNP third transistor Q3 through a forward rectifying diode D7, a forward diode D9, and a current limiting resistor R7. A filter capacitor C6 is connected in parallel between the junction A of the rectifier diode D7 and the diode D9 and the grounded negative pole of the battery E1; the emitter of the third transistor Q3 is connected to the positive pole of the battery E1; the emitter of the third transistor Q3 and An LED module 7 is connected across the ground terminal, and the LED module is composed of several high-brightness white light-emitting diodes and corresponding current-limiting resistors connected together. The emitter of the third transistor Q3 is connected to the base of the fourth transistor Q4 through a base resistor R10, and the emitter is also connected to the collector of the fourth transistor Q4 through a load resistor R9, so that The voltage of the storage battery E1 is applied between the collector and the emitter of the fourth transistor Q4, and a connection resistor R8 is connected between the collector of the fourth transistor Q4 and the base of the third transistor Q3, Meanwhile, the photoresistor CDS is connected across the base and the emitter of the fourth transistor Q4.

The working mode of this circuit is as follows: when the grid has power, the 110V or 220V mains is rectified and filtered by the rectifier filter circuit 1, and a DC voltage of about 300V is formed between the positive terminal of the filter capacitor C1a and the negative terminal of the filter capacitor C1b. One way is added to the input end of the half-bridge oscillation circuit 2, the circuit oscillates, and generates tens of kilohertz of alternating current, which ignites the energy-saving lamp tube 4 to emit light; the other way is added to the input end of the charging circuit 4, the circuit generates intermittent oscillation, and the pulse transformer T1 The two ends of the secondary winding N2 of the secondary winding N2 generate a low-voltage alternating current of tens of kilohertz. After the alternating current is rectified and filtered by the high-frequency rectification and filtering circuit, it outputs a low-voltage direct current to charge the battery E1. At this time, since the DC potential at point A of the cathode of the rectifier diode D7 connected to the auxiliary winding N4 is higher than the DC voltage at the cathode B of the rectifier diode D8 connected to the secondary winding L2, the third transistor Q3 is based on The emitter voltage is cut off for reverse bias. At the same time, because the energy-saving lamp tube 3 emits light and the environment is bright, the resistance value of the photosensitive resistor CDS in the light control circuit 6 becomes smaller, and the voltage on it is lower than the conduction voltage of the fourth triode Q4, and the fourth triode is cut off. The third triode Q3 is also turned off in reverse bias, and the LED module 7 does not emit light.

When the power grid fails, the rectifying and filtering circuit 1 has no output voltage, the half-bridge oscillating circuit 2 stops working, the energy-saving lamp tube 3 does not emit light, and the charging circuit 4 does not work either. At this time, the ambient light is dark, the resistance value of the photoresistor CDS increases, and the voltage drop on it reaches the turn-on voltage of the fourth transistor Q4, the fourth transistor Q4 is turned on, and the collector potential drops to zero, and the fourth transistor Q4 is turned on, and the collector potential drops to zero. The triode Q3 is forward biased and turned on, and its collector current flows from the positive pole of the battery E1 through the LED module to the negative pole of the battery E1, and the LED module emits light for illumination.

Fig. 2 is a schematic structural diagram of an emergency light designed according to the above principles. It can be seen from the figure that the emergency light has a connecting body 8, a lamp cap 9 is arranged on the upper part of the connecting body, and two connecting arms 10, 11 extending to both sides are arranged on the lower part of the connecting body. A ring-shaped energy-saving lamp tube 3 is movably fixed at the ends of the two connecting arms. A circuit board 12 and a storage battery 5 are placed in the cavity of the connecting body 8, and the circuit board is arranged with a rectification and filtering circuit, a half-bridge oscillation circuit, a charging circuit, a light control circuit and an LED module in FIG. 1 . On the bottom surface 15 of the connecting body 8, there are several through holes 13 corresponding to the diameters of the light-emitting diodes in the LED module 7. Extend out one by one, facing the lighting area. A window 14 is opened on the side of the connector 8, and the position of the window just faces the light-receiving surface of the photoresistor CDS after the circuit board 12 is seated, so that the photoresistor CDS can sense ambient light.

This ring-shaped emergency light is light in weight and can be used as a chandelier or as a ceiling light. When the power grid is on, the luminous brightness is large, and when the power is cut off, it will automatically switch to the LED module to emit light.

The above are only preferred embodiments of the present utility model. Under the premise of not departing from the principle of the utility model, some deformations or improvements can also be made, such as using slightly different charging circuits or light control circuits, energy-saving lamps using other special-shaped lamp tubes, these should also be regarded as belonging to the utility model scope of protection.

Claims (4)

1. An emergency light, comprising: a rectification filter circuit (1) whose input end can be connected to the mains, a charging circuit (4) connected to the output end of the rectification filter circuit and a half-bridge oscillator circuit ( 2), an energy-saving lamp tube (3) connected to the output end of the half-bridge oscillation circuit, a storage battery (5) connected to the output end of the charging circuit, and a connecting body (8) for assembling them together, It is characterized in that: the utility model also includes an LED module (7) containing several high-brightness light-emitting diodes mounted on the connecting body (8), respectively connected with the charging circuit (4), the storage battery (5) and the LED module ( 7) A light control circuit (6) connected. 2. An emergency light according to claim 1, characterized in that: the charging circuit (4) includes a switching transistor (Q1), a pulse transformer (T2), a protection transistor (Q2), and a switching transistor ( The collector of Q1) is connected to the output positive terminal of the rectification filter circuit (1) through the primary winding (N1) of the pulse transformer (T1), and its emitter is connected to the output of the rectification filter circuit (1) through the emitter resistor (R4). On the negative terminal, the base resistor (R3) and the capacitor (C3) are connected in series between the base of the switching transistor (Q1) and the feedback winding (N3) of the pulse transformer (T1), and the regulator tube (ZD1) and The capacitor (C4) is connected in series between the base of the switching transistor (Q1) and the other end of the feedback winding (N3) connected to the output negative end of the rectifier filter circuit (1), and between the regulator tube (ZD1) and the capacitor (C4) A forward diode (D6) is connected to the contact of the capacitor (C3) and the feedback winding (N3) in parallel to form a feedback network for the on/off intermittent oscillation of the switching transistor (Q1); at the output of the rectifier filter circuit (1) A start-up resistor (R3) is connected between the positive end and the base of the switching transistor (Q1); a high-frequency rectification and filtering circuit is connected to the secondary winding (N2) of the pulse transformer (T1) whose one end is grounded. The output positive terminal and negative terminal of the frequency rectification filter circuit are respectively connected to the positive pole and the negative pole of the storage battery; the collector and emitter of the protection transistor (Q2) are respectively connected to the base of the switching transistor (Q1) and the rectification filter circuit (1) The negative terminal of the output is connected, and its base is connected to the emitter of the switching transistor (Q1), forming an overcurrent protection circuit for the switching transistor (Q1) to oscillate. 3. An emergency light according to claim 2, characterized in that: a forward diode (D5) and a capacitor are connected in series between the collector of the switching transistor (Q1) and the output positive terminal of the rectification filter circuit (1) (C2), and a resistor (R1) is connected in parallel at both ends of the capacitor (C2) to become an overvoltage protection circuit for the switching transistor (Q1) to oscillate. 4. An emergency light according to claim 3, characterized in that: the light control circuit (6) includes a third triode (Q3), a fourth triode (Q4), a photoresistor (CDS) and an auxiliary winding (N4) magnetically coupled with the pulse transformer (T1), one end of the auxiliary winding (N4) is connected to the remote end of the secondary winding (N2) of the pulse transformer (T1), and its The other end is connected to the base of the PNP-type third triode (Q3) through the forward rectifier diode (D7), forward diode (D9), and current limiting resistor (R7), and the rectifier diode (D7) and the diode ( The contact point (A) of D9) is connected to the negative pole of the storage battery (E1) and connected with a filter capacitor (C6); the emitter of the third triode (Q3) is connected to the positive pole of the storage battery (E1); the LED module spans Connected to the collector and ground of the third transistor (Q3); a base connected to the base of the fourth transistor (Q4) is connected to the emitter of the third transistor (Q3) Resistor (R10), the emitter of the third transistor (Q3) is connected to the collector of the fourth transistor (Q4) through a load resistor (R9), and the collector of the fourth transistor (Q4) A connection resistor (R8) is connected in series with the base of the third transistor (Q3), and at the same time, the photoresistor (COS) is connected across the base of the fourth transistor (Q4) and the grounded emitter. end.

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