CN201081132Y - A kind of fire emergency sign light - Google Patents

Abstract

A fire-fighting emergency marking lamp is characterized in that: the marking lamp consists of a power source circuit, a 132V-187V emergency switching circuit, a main oscillation circuit, an overvoltage/overcurrent protective circuit, a switching transformer, a DC voltage-stabilizing control circuit, a charging control circuit, a nickel cadmium rechargeable battery, a light source circuit, a failure testing circuit and an emergency switching control circuit capable of automatically switching to the emergency state during under voltage commercial power or power failure. The utility model has the advantages that: (1) the utility model provides a fire-fighting emergency marking lamp with high energy-saving performance, low cost, long service life and more striking mark; (2) with a simple circuit and high reliability, the marking lamp, which accords with the national standards (GB17945-2000) with overall performance completely or partly exceeding the national standards, is particularly suitable to be used in large-scale centralized recreation areas and shopping malls.

Description

A kind of fire emergency sign light

(1) Technical field:

The utility model relates to a lamp, in particular to a high-performance fire-fighting emergency sign lamp manufactured by applying the principle of an inverter circuit.

(2) Technical background:

The fire emergency sign light is a lighting tool used to provide signs for evacuation when a fire breaks out in a building. With the rapid development of social economy, there are more and more large-scale centralized entertainment places and stores, and the market's The fire-fighting emergency sign lights are visually eye-catching, and they have high power consumption and short light source life. The application of such products in today's energy shortage will increase unnecessary burdens on the country, society and business households, and will also lead to lighting emergency needs. trouble.

(3) Contents of the invention:

The purpose of this utility model is to provide a kind of fire-fighting emergency sign light, which overcomes the above-mentioned shortcomings by applying the working principle of the inverter circuit, and is a fire-fighting emergency sign light with high energy saving, low cost and long service life.

The technical scheme of the utility model: a fire emergency sign lamp, characterized in that it is composed of a power supply circuit, a 132V-187V emergency conversion circuit, a main oscillation circuit, an overvoltage/overcurrent protection circuit, a switching transformer, and a DC voltage stabilization control circuit. , charging control circuit, nickel-cadmium rechargeable battery, light source circuit, emergency conversion control circuit and fault detection circuit that can automatically switch to emergency state when the mains is undervoltage or power failure; the said power supply with AC-DC conversion function The input end of the circuit is connected to the AC mains, the output end is connected to the 132V-187V emergency conversion circuit and the main oscillation output circuit; the output end of the 132V-187V emergency conversion circuit is connected to the input end of the main oscillation circuit, and the emergency conversion circuit is grounded; the main oscillation circuit passes through The overvoltage/overcurrent protection circuit is grounded, and the output end of the main oscillation circuit is connected to the switching transformer, which is converted into low-voltage direct current DC8.5V/DC3.5V. Power supply; the output end of the DC voltage stabilization control circuit is connected to the input end of the emergency conversion control circuit, and the DC voltage stabilization control circuit is grounded; the charging control circuit and the emergency conversion control circuit are connected to the nickel-cadmium rechargeable battery.

The power supply circuit mentioned above is connected to an external power supply and is composed of a bridge-type full-wave rectifier circuit, a current-limiting resistor and a filter capacitor. The full-wave rectifier circuit and the current-limiting resistor are connected in series to the AC mains. .

The 132V-187V emergency conversion circuit mentioned above is mainly composed of a triode and a voltage dividing resistor. The collector of the triode is connected to the base of the next triode in sequence to control whether it is turned on, and then control whether the main oscillation circuit oscillates and outputs .

The overvoltage/overcurrent protection circuit mentioned above is composed of Zener diodes, triodes and voltage divider resistors, which constitute an overcharge circuit that automatically switches to trickle charge with a small current when the battery voltage reaches the maximum allowable value, and when the battery When the discharge reaches the allowable value, the over-discharge circuit of the discharge circuit is automatically cut off, and the cathode of the Zener diode is connected to the base of the triode.

The above-mentioned DC voltage stabilization control circuit is composed of a triode and a voltage dividing resistor, and the output terminal charges the battery through a diode.

The above-mentioned emergency conversion control circuit is composed of a triode, a diode, a capacitor, and a voltage dividing resistor. The anode of the capacitor is connected to the base of the triode to provide a conduction voltage for it.

The fault detection circuit mentioned above is composed of a voltage dividing resistor, a triode and a light-emitting diode. The voltage dividing resistor provides a conduction voltage for the base of the triode, and the emitter of the triode is connected to the light-emitting diode to realize an alarm function.

The above-mentioned light source circuit is composed of LED light-emitting diodes.

The working process of the utility model is as follows: the emergency light circuit adopts the inverter circuit principle, when 220V is normally input, the city power is filtered by D1, D2, D3, D4 full-wave rectification, R1 current limiting and C1, and the output is 300V, Q1b The bias voltage makes Q1 saturated and turned on, Q1C is about 0V, Q3 cuts off Q4b current and injects normal start-up output through R11; when the mains input is a value between 132V-187V, the mains is full-wave through D1-D4 After the rectifier R1 limits the current and filters C1, the output is lower than 300V, Q1b is 0.5V lower. At this time, Q1 is cut off, Q3 is turned on, and the current of Q4b is 0A. Q4 stops vibration and has no output, thus realizing the conversion from main power to backup power at 132V-187V . Similarly, when the input voltage > 150V-187V, it will automatically switch to the main power state.

When the input voltage is normal and the load current is normal, the blocking oscillator starts to oscillate and the Q4b voltage is the normal starting voltage. Since D8 is a 4.3V regulator tube, the R10 terminal voltage is <0.4V, Q5 is turned off, and the switching power supply is normal. Work.

When the input voltage > 300V, the voltage parallel negative feedback startup process is as follows: when the input > 300V, the TR1 feedback output is rectified and filtered > -4.3V, D8 breaks down, and the voltage of Q4b drops, so that the input current of Q4b decreases, and the main output current remains No change, to ensure the safe operation of the inverter circuit used by the emergency lights.

When the input voltage > 300V or the load current increases, the current series negative feedback startup process is: when the mains input voltage > 300V or the load current increases, the current flowing through the resistor R10 increases, and when the R10 terminal voltage > 0.5V , when Q5 enters the enlarged conduction area, the voltage of Q4b decreases, ensuring that the current of Q4c does not increase with the increase of the mains input voltage or the increase of the load current, and ensures the safe operation of the switching power supply; C2, D6, and R9 are used to prevent power surge pulses and This power pulse pollutes the mains, and the filter circuit is set.

In the main power state, 8.5V cuts off Q9 through R13, D11, D14, and D15. When the main power is disconnected, due to the memory effect of capacitor C8, Q10 is still in the conduction state at the moment of power failure. After Q9 loses the reverse bias voltage, Q9b current is formed through Q10, which makes Q9 conduct instantly, and the battery voltage continues to be maintained through D13 and Q9. Q10 and Q9 are turned on, and the sign screen is on at this time, and the emergency switch is realized. This is the emergency state; when the battery voltage drops to about 3.3V after the emergency, the battery voltage cannot maintain the turn-on of Q9, Q9 is turned off, and the sign When the screen is off, it will immediately enter the shutdown state, thus completing an emergency cycle.

When the battery insurance is broken or the battery is open, the voltage of the main charging circuit rises to about 8.5V. This voltage divides the voltage of R18 and R19, so that Q6 is turned on, and the yellow light of Q6c is lowered; start the emergency conversion circuit, 8.5V in the main power state Charge the battery through the relevant circuit. When the switch SB is pressed, the voltage is from R13 and D11 to the ground, so that Q8 loses its bias and cannot work. At this time, due to the memory function of C8, Q10 is turned on, Q9 is turned on, and the circuit into an emergency state.

The utility model has the advantages of: 1. The fire emergency sign lamp adopts the inverter working principle to provide a fire emergency sign light with high energy saving, low cost, long life and more eye-catching signs; 2. The circuit of the fire emergency sign light is simple , high reliability, in line with the national GB17945-2000 standard, the overall performance completely or partly exceeds the national standard, and is extremely suitable for large-scale centralized entertainment venues and stores.

(4) Description of drawings:

Fig. 1: It is the block diagram of the overall circuit principle of a kind of fire emergency sign light involved in the utility model.

Fig. 2: It is a structure diagram of circuit components of a kind of fire emergency sign light involved in the utility model.

(5) Specific implementation methods:

Embodiment: a kind of fire emergency sign lamp (seeing Fig. 1), it is characterized in that it is controlled by power supply circuit, 132V-187V emergency conversion circuit, main oscillation circuit, overvoltage/overcurrent protection circuit, switching transformer, DC voltage regulator Circuit, charging control circuit, nickel-cadmium rechargeable battery, light source circuit, emergency conversion control circuit and fault detection circuit that can automatically switch to emergency state when the mains is undervoltage or power failure; the said AC-DC conversion function The input end of the power circuit is connected to the AC mains, and the output end is connected to the 132V-187V emergency conversion circuit and the main oscillation output circuit; the output end of the 132V-187V emergency conversion circuit is connected to the input end of the main oscillation circuit, and the emergency conversion circuit is grounded; the main oscillation circuit The overvoltage/overcurrent protection circuit is grounded, and the output end of the main oscillation circuit is connected to the switching transformer, which is converted into low-voltage direct current DC8.5V/DC3.5V. The circuit supplies power; the output end of the DC voltage stabilization control circuit is connected to the input end of the emergency conversion control circuit, and the DC voltage stabilization control circuit is grounded; the charging control circuit and the emergency conversion control circuit are connected to the nickel-cadmium rechargeable battery.

The above-mentioned power supply circuit (see Figure 2) is composed of bridge full-wave rectifier circuit, current limiting resistor and filter capacitor, including diodes D1, D2, D3, D4, current limiting resistor R1, filter capacitor C1, full-wave rectifier The circuit and the current limiting resistor are connected in series to the AC mains, and the output terminal of the rectification circuit is connected to the filter capacitor.

The above-mentioned 132V-187V emergency conversion circuit (see Figure 2) is mainly composed of triodes and voltage dividing resistors, including triodes Q1, Q3, Q4, voltage dividing resistors R3, R4, R7, R11, R12, collectors of the triodes Connect with the base of the next triode in turn to control whether it is turned on, and then control whether the main oscillation circuit oscillates and outputs.

The above-mentioned overvoltage/overcurrent protection circuit (see Figure 2) is composed of a Zener diode, a triode and a voltage dividing resistor, including a Zener diode D8, a transistor Q4, a resistor R10, the cathode of the Zener diode and the base of the triode. Pole connection; when the battery voltage is charged to the maximum allowable value, it will automatically switch to the overcharge circuit with a small current trickle charge, and when the battery discharges to the allowable value, it will automatically cut off the discharge circuit.

The above-mentioned DC voltage stabilization control circuit (see Figure 2) is composed of triode and voltage divider resistors, including KIA7042, transistor Q8, voltage divider resistors R21, R22, and diode D12. The output terminal charges the battery through the diode.

The above-mentioned emergency conversion control circuit (see Figure 2) is composed of triode, diode, capacitor and voltage dividing resistor, including voltage dividing resistor R13, diodes D11, D14, D15, voltage regulator diode D13, triode Q9, Q10, capacitor C8, the positive electrode of the capacitor is connected to the base of the triode to provide it with a conduction voltage.

The above-mentioned fault detection circuit (see Fig. 2) is composed of a voltage dividing resistor, a triode and a light-emitting diode, including a voltage dividing resistor R18, R19, and a transistor Q6. Connect the light-emitting diode to realize the alarm function.

The above-mentioned light source circuit (see Figure 2) is composed of LED light-emitting diodes.

Claims (8)

1. fire-fighting emergent identification lamp, it is characterized in that it is to swing circuit, overvoltage/current foldback circuit, switch transformer, DC voltage-stabilizing control circuit, charging control circuit, nickel-cadmium chargeable battery, circuit of light sources by power circuit, the emergent change-over circuit of 132v-187v, principal earthquake, can be at civil power under-voltage or be transformed into the emergent conversion control circuit of emergency rating when having a power failure automatically, failure detector circuit be formed; Said power circuit input with AC-DC translation function connects electric main, and output is connected to the emergent change-over circuit of 132v-187v and output circuit is swung in principal earthquake; The output of the emergent change-over circuit of 132v-187v connects the input that circuit is swung in principal earthquake, emergent change-over circuit ground connection; Principal earthquake is swung circuit by overvoltage/current foldback circuit ground connection, the output that circuit is swung in principal earthquake connects switch transformer, be converted to low-voltage DC DC8.5V/DC3.5V, after the voltage stabilizing of DC voltage-stabilizing control circuit, be charging control circuit and emergent conversion control circuit power supply; The output of DC voltage-stabilizing control circuit connects the input of emergent conversion control circuit, DC voltage-stabilizing control circuit ground connection; Charging control circuit and emergent conversion control circuit are connected with nickel-cadmium chargeable battery.

2. according to the said a kind of fire-fighting emergent identification lamp of claim 1, it is characterized in that said power circuit is made up of full-wave bridge rectifier circuit, current-limiting resistance and filter capacitor, full-wave rectifying circuit and current-limiting resistance series connection back is connected electric main, the output connection filter capacitor of rectification circuit.

3. according to the said a kind of fire-fighting emergent identification lamp of claim 1, it is characterized in that the emergent change-over circuit of said 132v-187v mainly is made up of triode and divider resistance, the colelctor electrode of triode is connected with the base stage of next triode in turn, control its whether conducting, and then the control principal earthquake is swung circuit and whether is shaken output.

4. according to the said a kind of fire-fighting emergent identification lamp of claim 1, it is characterized in that said overvoltage/current foldback circuit is made up of Zener diode, triode and divider resistance, constitute be transformed into automatically when cell voltage is charged to threshold limit value the very little trickle charge of electric current overcharge circuit and when battery discharge overdischarge road of cut-out discharge loop automatically during to permissible value; The negative electrode of Zener diode is connected with the base stage of triode.

5. according to the said a kind of fire-fighting emergent identification lamp of claim 1, it is characterized in that said DC voltage-stabilizing control circuit is made of triode and divider resistance, output is a battery charge by diode.

6. according to the said a kind of fire-fighting emergent identification lamp of claim 1, it is characterized in that said emergent conversion control circuit is made up of triode, diode, electric capacity, divider resistance, capacitance cathode is connected with transistor base, for it provides conducting voltage.

7. according to the said a kind of fire-fighting emergent identification lamp of claim 1, it is characterized in that said failure detector circuit is made up of divider resistance, triode and light emitting diode, divider resistance provides conducting voltage for transistor base, and triode emission collection connects light emitting diode and realizes warning function.

8. according to the said a kind of fire-fighting emergent identification lamp of claim 1, it is characterized in that said circuit of light sources is to be made of the LED light emitting diode.

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