CN102665309A

CN102665309A - Emergency fluorescent lamp

Info

Publication number: CN102665309A
Application number: CN2012101375439A
Authority: CN
Inventors: 何林
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-06
Filing date: 2012-05-06
Publication date: 2012-09-12

Abstract

The invention relates to an emergency fluorescent lamp. The emergency fluorescent lamp is composed of a 6V direct-current power supply, a self-excited oscillator circuit and a boosting and lighting circuit, wherein the model of a power switch integrated circuit IC1 in the self-excited oscillator circuit is TWH8751. The dependence on power supply is higher and higher at present, so power failures can bring about great influences or cause losses to the normal work, life and student learning. The emergency fluorescent lamp is standby lighting equipment independent of a power system, and the common emergency lighting equipment usually uses a storage battery as a power supply. The emergency fluorescent lamp provided by the invention is suitable for 6-8W fluorescent lamp, can meet the requirement of emergency lighting when a power supply line is switched off for a short time, and is also suitable for emergency lighting of various small public places or emergency lighting for fire protection. If four D manganese-zinc dry batteries are used, the lighting time of the emergency fluorescent lamp is more than 90 minutes..

Description

The emergency fluorescent lamp

Technical field

The invention belongs to electronic technology and emergency lighting field, relate to a kind of emergency fluorescent lamp.

Background technology

Improving constantly of Along with people's daily life level, people are also increasingly high to the dependence of power supply, in case power failure brings very big influence or cause some losses for normal work, life and student's study.The emergency fluorescent lamp is the emergency lighting that is independent of outside the electrical network, emergency-lighting set commonly used many with storage battery as power supply.

Emergency fluorescent lamp of the present invention is fit to adapted 6～8W fluorescent lamp; It can tackle the requirement of supply lines short time emergency lighting when having a power failure; Also be applicable to the emergency lighting or the fire emergency of various small-sized public places; If use 4 joint 1# MnZn dry cells, this emergency fluorescent lamp lighting time was greater than 90 minutes.

Below specify the related in force correlation technique content of this emergency fluorescent lamp.

Summary of the invention

Goal of the invention and beneficial effect: people are increasingly high to the dependence of power supply now, in case power failure brings very big influence or cause some losses for normal work, life and student's study.The emergency fluorescent lamp is the emergency lighting that is independent of outside the electrical network, emergency-lighting set commonly used many with storage battery as power supply.Emergency fluorescent lamp of the present invention is fit to adapted 6～8W fluorescent lamp; It can tackle the requirement of supply lines short time emergency lighting when having a power failure; Also be applicable to the emergency lighting or the fire emergency of various small-sized public places; If use 4 joint 1# MnZn dry cells, this emergency fluorescent lamp lighting time was greater than 90 minutes.

The circuit working principle: it is core parts that the circuit of emergency fluorescent lamp adopts power switch circuit IC1 (TWH8751); Power switch circuit IC1 internal circuit is made up of input stage, buffer amplifier and Darlington power output stage; And be provided with feedback control loop and subtract the flow pattern output protection circuit, versatility is very strong.When the level of the gating end (the 2nd pin) of power switch circuit IC1 >=1.6V, the input of power switch circuit IC1 (the 1st pin) is to the no control action of output (the 4th pin), and promptly internal circuit final stage Darlington transistor ends, the circuit no-output; The 2nd pin that has only power switch circuit IC1 be low level (＜1.2V) time, be added in the signal level of power controlling switch integrated circuit IC1 output effectively on the power switch circuit IC1 input.

The emergency fluorescent lamp selects for use TWH8751 as self-excited oscillator circuit core element, and its peripheral resistance R 1 is a current-limiting resistance, and potentiometer RP, electric capacity of the dacron C2 are determining frequency of oscillation, and electrochemical capacitor C1 is used for stablizing the voltage of 6V DC power supply.The vibration winding L 1 of oscillation step-up transformer is determining the height of oscillating voltage, can induce higher voltage in the winding L 2 of boosting of oscillation step-up transformer, thereby fluorescent material and mercuryvapour in the percussion fluorescent lamp are lighted fluorescent lamp RGD.

Technical scheme: the emergency fluorescent lamp, it by 6V DC power supply, self-excited oscillator circuit, boost and lighting circuit is formed, its characteristic comprises:

The self-excited oscillator circuit: the vibration winding L 1 by power switch circuit IC1, resistance R 1, electric capacity of the dacron C2, potentiometer RP and oscillation step-up transformer T is formed; The model that power switch circuit IC1 selects for use is TWH8751; The anodal VCC of connection circuit behind the 5th pin series resistor R1 of power switch circuit IC1; The 1st pin of power switch circuit IC1 connects the end of electric capacity of the dacron C2 and the end of potentiometer RP; The 3rd pin connection circuit ground GND of the other end of electric capacity of the dacron C2 and power switch circuit IC1; The 4th pin of power switch circuit IC1 meets the other end of potentiometer RP and an end of lever arm and oscillation step-up transformer T vibration winding L 1 thereof, the anodal VCC of other end connection circuit of oscillation step-up transformer T vibration winding L 1;

Boost and lighting circuit: the winding L 2 of boosting by oscillation step-up transformer T is formed with fluorescent lamp RGD; The boost other end of winding L 2 of the boost termination circuit ground GND of an end and fluorescent lamp RGD of winding L 2 of oscillation step-up transformer T, oscillation step-up transformer T links to each other with the other end of fluorescent lamp RGD.

The 6V dc power anode links to each other with circuit anode VCC, and the 6V dc power cathode links to each other with circuit ground GND.

Description of drawings

Accompanying drawing 1 is the circuit working schematic diagram of emergency fluorescent lamp; T is an oscillation step-up transformer in the accompanying drawing 1.

Embodiment

Specification requirement according to the components and parts of the circuit working schematic diagram of the emergency fluorescent lamp shown in the accompanying drawing 1 and description of drawings and the following stated is implemented, and can realize the present invention.

The selection of components and parts and technical parameter

IC1 is a power switch circuit; The model of selecting for use is TWH8751; Its packing forms is TOP-220, and the required Control current of TWH8751 input stage gating end is very little, only 100～200 μ A; Buffer amplifier and Darlington power are formed output stage, and are provided with feedback control loop and subtract the flow pattern output protection circuit in inside; Power switch circuit IC1 has 5 pins, and pin function is respectively: input (IN), gating end (ST), circuit ground (GND), output (OUT) and positive source (VCC);

The resistance of resistance R 1 is that 680 Ω, power are 1/2W; RP is a potentiometer, and its resistance is 220K Ω;

C1 is an electrochemical capacitor, and capacity is 470 μ F/16V; C2 is an electric capacity of the dacron, and capacity is 0.01 μ F;

RGD is a fluorescent lamp, and optional use power is the fluorescent lamp of 6～8W;

The 6V DC power supply can be selected 6V, 4AH storage battery for use, or uses 4 joint 1# MnZn dry cells when emergent.

Circuit production main points and circuit debugging

The making of oscillation step-up transformer T: magnetic core is selected U type ferrite magnetic core or ring type magnetic core for use; Also available common EI type or FF type silicon steel sheet replace; But conversion efficiency will reduce; Vibration winding L 1 usefulness ￠ 0.3～0.4mm enamelled wire is around 45 circles, and the winding L of boosting 2 usefulness ￠ 0.12～0.15mm enamelled wire is around 1500 circles;

The circuit of emergency fluorescent lamp welds according to the annexation of components and parts shown in the accompanying drawing 1 as long as the components and parts performance of using is intact, the physics wiring is conscientiously checked and check errorless after, the circuit of this device need not debugged and get final product operate as normal;

During circuit debugging adjustable potentiometer RP lever arm is spun on the centre position, can makes fluorescent lamp RGD luminous behind the connection 6V DC power supply, adjustment potentiometer RP makes the complete machine Current Control get final product at 260mA～320mA;

Use 4 joint 1# MnZn dry cells, the emergency fluorescent lamp lighting time was greater than 90 minutes.When finding phenomenons such as the fluorescent lamp appearance is dim, flicker, should be that the electric weight of 6V DC power supply is not enough, in time change dry cell, or in time storage battery charged.

Claims

1. emergency fluorescent lamp, it by 6V DC power supply, self-excited oscillator circuit, boost and lighting circuit is formed, its characteristic comprises:

The self-excited oscillator circuit is made up of the vibration winding L 1 of power switch circuit IC1, resistance R 1, electric capacity of the dacron C2, potentiometer RP and oscillation step-up transformer T; The model that power switch circuit IC1 selects for use is TWH8751; The anodal VCC of connection circuit behind the 5th pin series resistor R1 of power switch circuit IC1; The 1st pin of power switch circuit IC1 connects the end of electric capacity of the dacron C2 and the end of potentiometer RP; The 3rd pin connection circuit ground GND of the other end of electric capacity of the dacron C2 and power switch circuit IC1; The 4th pin of power switch circuit IC1 meets the other end of potentiometer RP and an end of lever arm and oscillation step-up transformer T vibration winding L 1 thereof, the anodal VCC of other end connection circuit of oscillation step-up transformer T vibration winding L 1;

Boost and lighting circuit is made up of with fluorescent lamp RGD the winding L 2 of boosting of oscillation step-up transformer T; The boost other end of winding L 2 of the boost termination circuit ground GND of an end and fluorescent lamp RGD of winding L 2 of oscillation step-up transformer T, oscillation step-up transformer T links to each other with the other end of fluorescent lamp RGD.

2. emergency fluorescent lamp according to claim 1 is characterized in that: the 6V dc power anode links to each other with circuit anode VCC, and the 6V dc power cathode links to each other with circuit ground GND.