CN219999639U - Lighting lamp power supply circuit capable of automatically switching emergency power supply - Google Patents

Abstract

The utility model provides a lighting lamp power supply circuit capable of automatically switching emergency power supply, which relates to the technical field of lighting control and comprises an automatic switching constant voltage circuit, a power supply input circuit coupled to an input end of the automatic switching constant voltage circuit, a switching power supply circuit and an LED constant current driving circuit which are respectively coupled to an output end of the automatic switching constant voltage circuit and used for controlling the lighting lamp.

Description

Lighting lamp power supply circuit capable of automatically switching emergency power supply

Technical Field

The utility model relates to the technical field of illumination control, in particular to an illumination lamp power supply circuit capable of automatically switching emergency power supplies.

Background

Emergency lighting is an important safety facility of modern public buildings, which is closely related to the life safety of people. When a fire disaster or other disasters occur in a building and power interruption occurs, emergency illumination plays an important role in personnel evacuation, rescue and other works.

At present, when the alternating current is interrupted, the lighting lamps at the underground garage, corridor and other positions in most public buildings cannot work normally, and only the emergency lighting lamps additionally arranged on the wall can be used for emergency lighting. And traditional emergency lighting lamps generally use built-in storage batteries for emergency power supply, and the emergency lighting time is limited. And the emergency lighting lamp has the advantages of small installation quantity, large interval and limited lighting range. A large number of lighting fixtures for daily indoor lighting are usually arranged in a public building, the traditional lighting fixtures can only be used for lighting when an alternating current power supply is normally input, and the help of environment lighting, route guidance and the like can not be provided for evacuees in disaster scenes where the alternating current power supply is interrupted.

Therefore, a lighting lamp power circuit capable of automatically switching emergency power sources when a disaster occurs is studied, so that the lighting lamp for daily lighting in a public building can provide lighting in emergency conditions, and the lighting lamp power circuit has great significance.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide the lighting lamp power supply circuit capable of automatically switching the emergency power supply, which can automatically switch the emergency power supply when a disaster occurs, provide stable and reliable illumination and improve the safety of the escape process.

The technical aim of the utility model is realized by the following technical scheme:

the utility model provides an automatic switch emergency power supply's lighting fixture power supply circuit, includes automatic switch constant voltage circuit, the power input circuit who is coupled in automatic switch constant voltage circuit input, and couple respectively in automatic switch constant voltage circuit output be used for controlling lighting fixture's switching power supply circuit and LED constant current drive circuit, power input circuit includes AC input circuit and emergent direct current input circuit.

Through the technical scheme, the alternating current input circuit rectifies and filters alternating current to convert the direct current into direct current and outputs the direct current to the automatic switching constant voltage circuit, the emergency direct current input circuit outputs the emergency direct current to the automatic switching constant voltage circuit when the alternating current input circuit fails and cannot output a direct current power supply, the automatic switching constant voltage circuit boosts the direct current output by the alternating current input circuit or the emergency direct current input circuit and outputs the boosted direct current to the switching power circuit and the LED constant current driving circuit after power factor correction, the switching power circuit converts the voltage output by the automatic switching constant voltage circuit into low-voltage direct current voltage and outputs the low-voltage direct current voltage, and the LED constant current driving circuit drives the LED lamp to work by using the power supply provided by the automatic switching constant voltage circuit.

Further, the alternating current input circuit comprises an alternating current power supply input module AC1 and an alternating current rectifying and filtering circuit.

Through the technical scheme, 220V alternating current is connected through the alternating current power input module AC1, the connected 220V alternating current is rectified and filtered through the alternating current rectifying and filtering circuit, and direct current is output to the automatic switching constant voltage circuit.

Further, the ac rectifying and filtering circuit includes a bridge DB1 and a capacitor C1 coupled to the bridge DB 1.

Through the technical scheme, the conversion from alternating current to direct current is completed through the rectifying and filtering bridge DB1, and the rectified circuit is filtered through the capacitor C1.

Further, a fuse F1 is coupled between the AC power input module AC1 and the AC rectifying and filtering circuit.

Through the technical scheme, the fuse F1 plays an overload protection role on the circuit, and the circuit is protected from running safely.

Further, the emergency direct current input circuit comprises a direct current power supply input module DC1 and a diode D1 coupled to the direct current power supply input module DC 1.

Through the technical scheme, direct current access is completed through the direct current power supply input module DC1, and direct current input rectified through the alternating current input circuit is prevented from flowing backwards into the direct current input module DC1 through the diode D1.

Further, the automatic switching constant voltage circuit includes a chip U1 and a plurality of capacitors, resistors and diodes coupled to the chip U1.

Furthermore, the chip U1 is a BOOST PFC constant voltage driving chip with the model BP 2636D.

Furthermore, the LED constant current driving circuit selects a PWM dimming non-isolated buck type LED constant current driving chip with the model of BP2956 XS.

Further, the switching power supply circuit is a BP8523D driving chip.

In summary, the utility model has the following beneficial effects:

1. the utility model realizes that the same automatic switching constant voltage circuit can work under the two conditions of an alternating current power supply input circuit and an emergency direct current circuit, can meet the emergency direct current input of different voltages by adjusting the size of the peripheral resistor, can enable the lamps which are used for daily illumination in the building to continuously work under the condition of the emergency power supply to provide illumination, improves the illumination condition of escape paths in the building under the disaster condition, and provides guarantee for the escape process.

2. The utility model reduces the volume of the circuit board while meeting the design requirement, and effectively reduces the production cost.

Drawings

FIG. 1 is a block diagram schematic of the present embodiment;

fig. 2 is a circuit schematic of the present embodiment.

Reference numerals: 1. an alternating current input circuit; 2. an emergency direct current input circuit; 3. automatically switching the constant voltage circuit; 4. a switching power supply circuit; 5. and an LED constant current driving circuit.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

The utility model provides an automatic switch emergency power supply's lighting fixture power supply circuit, includes automatic switch constant voltage circuit 3, the power input circuit who is coupled in automatic switch constant voltage circuit 3 input, and the switching power supply circuit 4 and the LED constant current drive circuit 5 that are coupled in automatic switch constant voltage circuit 3 output respectively, switching power supply circuit 4 and LED constant current drive circuit 5 are used for controlling lighting fixture.

The power input circuit includes an ac input circuit 1 and an emergency dc input circuit 2.

The AC input circuit 1 includes an AC power input module AC1 and an AC power rectifying and filtering circuit. The alternating current power supply input module AC1 is connected with 220V alternating current of the commercial power. The alternating current rectifying and filtering circuit comprises a bridge DB1 and a capacitor C1, and a fuse F1 is coupled between the bridge DB1 and the alternating current power input module AC 1.

One end of the AC power input module AC1 with 220V AC input is connected to the fuse F1 and then connected to one AC input end of the bridge DB1, and the other end is directly connected to the other AC input end of the bridge DB 1. The direct current output positive end of the bridge DB1 is connected with the capacitor C1, and the direct current output negative end of the bridge DB1 is grounded.

The emergency DC input circuit 2 includes a DC power input module DC1 and a diode D1 coupled to the DC power input module DC 1. The selection of the DC power input module DC1 is determined according to the actual lighting fixture and the selection of the circuit components, and in this embodiment, the DC power input module DC1 selects 40V DC.

The positive terminal of the emergency DC input DC1 is connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 is coupled to the automatic switching constant voltage circuit 3.

The automatic switching constant voltage circuit 3 includes a chip U1 and a plurality of capacitors, resistors and diodes coupled to the chip U1.

In this embodiment, the chip U1 is a BOOST PFC constant voltage driving chip with a model BP 2636D. The LED constant current driving circuit 5 selects a PWM dimming non-isolated buck type LED constant current driving chip with the model BP2956 XS. The switching power supply circuit 4 selects a driving chip with the model BP 8523D.

The automatic switching constant voltage circuit 3 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a diode D2, a diode D3, an inductor L1, and a chip U1. One end of the resistor R1, one end of the resistor R2 and the positive end of the diode D2 are connected and connected with the negative end of the diode D1, and the other end of the resistor R1, the negative end of the diode D2 and one end of the inductor L1 are connected and connected to the direct current output positive end of the bridge DB 1. The capacitor C2 is connected in parallel between a VCC pin (3 rd pin) and a GND pin (2 nd pin) of the chip U1, the resistor R3 is connected in parallel between a CS pin (4 th pin) and a GND pin (2 nd pin) of the chip U1, 4 DRAIN (5 th, 6 th, 7 th and 8 th pins) of the chip U1 are connected with the other end of the inductor L1 and the positive end of the diode D3, the FB pin (1 st pin) of the chip U1 is connected with the resistor R5 and then grounded, the resistor R4 is connected between the negative end of the diode D3 and the FB pin (1 st pin) of the chip U1, the capacitor C3 is connected between the negative end of the diode D3 and the ground, and the GND pin (2 nd pin) of the chip U1 is grounded.

The alternating current input circuit 1 is connected with 220V alternating current and converts the alternating current into direct current through rectification and filtration, and outputs the direct current to the automatic switching constant voltage circuit 3, and the emergency direct current input circuit 2 outputs the emergency 40V direct current to the automatic switching constant voltage circuit 3 when the alternating current input circuit 1 fails and cannot output direct current. The automatic switching constant voltage circuit 3 boosts the direct current output from the alternating current input circuit 1 or the emergency direct current input circuit 2, corrects the power factor, and outputs the boosted direct current to the switching power supply circuit 4 and the LED constant current drive circuit 5. The switching power supply circuit 4 converts the voltage output by the automatic switching constant voltage circuit 3 into low-voltage direct-current voltage output for the LED lamp to work. The LED constant current driving circuit 5 uses the power supply provided by the automatic switching constant voltage circuit 3 to drive the LED lamp to work.

When the 220V AC power input module AC1 is normal, the automatic switching constant voltage circuit 3 rectifies the 220V AC power, filters the rectified power through the bridge DB1, and then connects the rectified power to the VCC pin (pin 3) of the chip U1 through the resistor R1 and the resistor R2. After the input current and voltage of the VCC pin of the chip U1 meet the working current conditions, the rectified and filtered direct current is subjected to BOOST boosting and power factor correction through the chip U1 and a peripheral circuit consisting of an inductor L1, a capacitor C2, a resistor R3, a diode D3, a resistor R4 and a resistor R5, and is output after being subjected to filtering through the capacitor C3 after correction.

When the 220V alternating current power input module AC1 is interrupted and the 40V direct current power input module DC1 outputs direct current, the automatic switching constant voltage circuit 3 is connected to a VCC pin (3 rd pin) of the chip U1 through a diode D1 and a resistor R2, and still meets working current and working voltage of the chip U1 after being connected to the VCC pin (3 rd pin), the 40V emergency direct current is connected to an inductor L1 through the diode D2, and BOOST boosting and power factor correction are carried out on the same chip U1 and peripheral circuits thereof as the 220V alternating current AC1 during normal input, and the 40V emergency direct current is output after being filtered by a capacitor C3. The direct current power input module DC1 is controlled by the adjusting resistor R3 to be input to the working current of the chip U1 through the current of the VCC pin (3 rd pin) of the chip U1 by the resistor R3, and the emergency direct current power input of various voltages can be realized. The diode D1 is connected between the positive end of the 40V direct current power supply input module DC1 and the positive ends of the resistor R1 and the diode D2, the diode D2 is connected between the direct current output positive end of the bridge DB1 and the diode D1 after being connected with the resistor R1 in parallel, 40V emergency direct current is allowed to flow into the inductor L1 through the diode D1 and the diode D2, and the direct current output rectified by the bridge DB1 is prevented from flowing backwards into the 40V direct current power supply input module DC 1.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.

Claims (9)

1. An illumination lamp power supply circuit capable of automatically switching emergency power supplies is characterized in that: the LED constant current driving circuit comprises an automatic switching constant voltage circuit (3), a power supply input circuit coupled to the input end of the automatic switching constant voltage circuit (3), and a switching power supply circuit (4) and an LED constant current driving circuit (5) which are respectively coupled to the output end of the automatic switching constant voltage circuit (3) and used for controlling the lighting lamp, wherein the power supply input circuit comprises an alternating current input circuit (1) and an emergency direct current input circuit (2).

2. The lighting fixture power circuit for automatically switching emergency power according to claim 1, wherein: the alternating current input circuit (1) comprises an alternating current power supply input module AC1 and an alternating current rectifying and filtering circuit.

3. The lighting fixture power circuit for automatically switching emergency power according to claim 2, wherein: the alternating current rectifying and filtering circuit comprises a bridge DB1 and a capacitor C1 coupled to the bridge DB 1.

4. The lighting fixture power circuit for automatically switching emergency power according to claim 2, wherein: and a fuse F1 is coupled between the alternating current power supply input module AC1 and the alternating current rectifying and filtering circuit.

5. The lighting fixture power circuit for automatically switching emergency power according to claim 1, wherein: the emergency direct current input circuit (2) comprises a direct current power supply input module DC1 and a diode D1 coupled to the direct current power supply input module DC 1.

6. The lighting fixture power circuit for automatically switching emergency power according to claim 1, wherein: the automatic switching constant voltage circuit (3) comprises a chip U1 and a plurality of capacitors, resistors and diodes coupled to the chip U1.

7. The lighting fixture power circuit for automatically switching emergency power according to claim 6, wherein: the chip U1 is a BOOST PFC constant voltage driving chip with the model of BP 2636D.

8. The lighting fixture power circuit for automatically switching emergency power according to claim 1, wherein: the LED constant current driving circuit (5) is a PWM dimming non-isolated buck type LED constant current driving chip with the model of BP2956 XS.

9. The lighting fixture power circuit for automatically switching emergency power according to claim 1, wherein: the switching power supply circuit (4) is a BP8523D driving chip.