CN209845365U

CN209845365U - Circuit for preventing lamp tube current from being overlarge and used for emergency lamp

Info

Publication number: CN209845365U
Application number: CN201821922240.7U
Authority: CN
Inventors: 陈祖盛; 何铭泰; 陈仪
Original assignee: Xirong Electrical Appliances (shenzhen) Co Ltd
Current assignee: Xirong Electrical Appliances (shenzhen) Co Ltd; Century Concept Ltd
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2019-12-24
Anticipated expiration: 2028-11-21

Abstract

The utility model discloses a prevent too big circuit of fluorescent tube electric current for emergency light, including LED power and LED lamp, the output series connection of LED power has diode D4 and LED lamp, the both sides of LED lamp are parallelly connected to have diode D5 and low pressure LED drive, low pressure LED driven input is connected to emergent supply circuit, emergent supply circuit's both ends are parallelly connected to have transformer T2's secondary winding T2B, transformer T2's first primary winding T2A's one end coupling to electric bridge BR1, MOS pipe Q1's drain electrode is coupled to first primary winding T2A's the other end, the utility model discloses increase a charging control circuit, prevent that the fluorescent tube electric current from exceeding its rated current, prolong the life-span of fluorescent tube, when having avoided using fluorescent tube supply circuit, because fluorescent tube supply circuit fluorescent tube electric current is greater than its rated current, the fast ageing problem of fluorescent tube.

Description

Circuit for preventing lamp tube current from being overlarge and used for emergency lamp

Technical Field

The utility model belongs to the technical field of supply circuit, concretely relates to prevent too big circuit of fluorescent tube electric current for emergency light.

Background

The emergency lamp adopts the LED lamp, and the pulse type driving chip of the LED lamp supplies power to the LED lamp through the output interface of the pulse generator with high frequency, and because the frequency of the pulse signal is very high, human eyes can not feel the stroboflash of the LED at all, so the mode not only accords with the visual requirement, but also effectively saves the electric energy output on the one hand.

However, the lamp tube power supply circuit in the current market still has certain defects in the use process, for example, when the emergency power supply of the same output lamp tube for general lighting and emergency is not controlled by other devices, when the commercial power is supplied again, the output current of the driver and the output current of the emergency lamp are simultaneously applied to the output lamp tube in a short time, so that the lamp tube current is larger than the rated current, the lamp tube is rapidly aged, and the service life is shortened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prevent the too big circuit of fluorescent tube electric current for emergency light to when solving the use fluorescent tube supply circuit who proposes in the above-mentioned background art, because fluorescent tube supply circuit fluorescent tube electric current is greater than its rated current, the ageing fast problem of fluorescent tube.

In order to achieve the above object, the utility model provides a following technical scheme: a circuit for preventing lamp tube current from being overlarge for an emergency lamp comprises an LED power supply and an LED lamp, wherein the output end of the LED power supply is connected with a diode D4 and the LED lamp in series, the two sides of the LED lamp are connected with a diode D5 and a low-voltage LED drive in parallel, the input end of the low-voltage LED drive is connected to an emergency power supply circuit, the two ends of the emergency power supply circuit are connected with a secondary coil winding T2B of a transformer T2 in parallel, one end of a first primary winding T2A of the transformer T2 is coupled to an electric bridge BR1, the other end of the first primary winding T2A is coupled to the drain electrode of a MOS tube Q1, the source electrode of the MOS tube Q1 is grounded, the grid electrode of the MOS tube Q1 is connected with a PWM drive, the negative electrode of a BR1 is grounded, the two alternating current output ends of the electric bridge BR1 are connected with a capacitor C1 in parallel, the two ends of the capacitor C1 are connected with a transformer T1 in parallel, the two ends of the transformer T1 are respectively connected to an anode and a cathode, the two alternating current output ends, the capacitor C2 is coupled to the LED drive power supply control through the voltage stabilizer Z1, the input end of the LED drive power supply control is connected with the bidirectional thyristor Q2, one end of the bidirectional thyristor Q2 is connected to the live wire N of alternating current, the other end of the bidirectional thyristor Q2 is connected to the LED power supply, and the input end of the LED power supply is connected to the zero wire L of the alternating current.

Preferably, the emergency power supply circuit comprises a MOS transistor Q4, an NPN triode Q3, a resistor R3, a resistor R1, a diode D3, a resistor R2, a capacitor C3, a diode D2, a capacitor C4, a voltage regulator Z2 and a resistor R4.

Preferably, the input end of the low-voltage LED driver is connected to a MOS transistor Q4, an NPN transistor Q3 and a resistor R3 which are connected in series, a gap between an NPN transistor Q3 and a resistor R3 is coupled to the drain of the MOS transistor Q4 through a voltage regulator Z2, a gap between the gate of the MOS transistor Q4 and the voltage regulator Z2 is connected to the source of the MOS transistor Q4 through a resistor R4, two ends of the NPN transistor Q4 and the resistor R4 are connected in parallel to a battery, two ends of the battery are connected in parallel to a resistor R4 and a diode D4, two ends of the resistor R4 are connected in parallel to a capacitor C4, a base of the NPN transistor Q4 is coupled between the resistor R4 and the diode D4 through a resistor R4 and a diode D4, an emitter of the NPN transistor Q4 is coupled to the resistor R4 through a capacitor C4, two ends of the capacitor C4 are connected in parallel to a secondary coil T2 of the transformer T4.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses increase a charging control circuit, through its control, when the commercial power has a power failure, the voltage of closing the LED power earlier, discharge the time delay back through electric capacity C4 again, NPN triode Q3 closes, and MOS pipe Q4 switches on, and low pressure LED drive power supply work, and the LED lamp is bright. When the commercial power comes, after the capacitor C4 is charged to be greater than 0.7V, the NPN triode Q3 is conducted, the MOS tube Q4 is closed, the LED lamp is not lighted, when the capacitor C2 is charged to be greater than 5V1, the bidirectional thyristor Q2 is controlled to be conducted through the LED driving power supply, the LED power supply works, the LED lamp is lighted, the circuit can effectively prevent the output of the emergency power supply and the output of the driving power supply from being simultaneously added to the output lamp tube, the current of the lamp tube is prevented from exceeding the rated current of the lamp tube, the service life of the lamp tube is prolonged, and the problem that when the lamp tube power supply circuit is used, the lamp tube is aged fast due to the fact that the.

Drawings

Fig. 1 is a circuit diagram of the present invention;

fig. 2 is the circuit diagram of the emergency power supply of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a prevent too big circuit of fluorescent tube electric current for emergency light, includes LED power and LED lamp, its characterized in that: the output end of the LED power supply is connected in series with a diode D4 and an LED lamp, the two sides of the LED lamp are connected in parallel with a diode D5 and a low-voltage LED drive, the input end of the low-voltage LED drive is connected to an emergency power supply circuit, the two ends of the emergency power supply circuit are connected in parallel with a secondary coil winding T2B of a transformer T2, one end of a first primary winding T2A of the transformer T2 is coupled to an electric bridge BR1, the other end of the first primary winding T2A is coupled to the drain of an MOS tube Q1, the source of the MOS tube Q1 is grounded, the gate of the MOS tube Q1 is connected with a PWM drive, the cathode of the electric bridge BR1 is grounded, the two AC output ends of the electric bridge 1 are connected in parallel with a capacitor C1, the two ends of the capacitor C1 are connected in parallel with a transformer T1, the two ends of the transformer T1 are respectively connected to an AC positive pole and a negative pole, the two AC output ends of the electric bridge BR1 are connected in parallel with a capacitor C1, the two ends of the second, the input end of the LED driving power supply control is connected with a bidirectional thyristor Q2, one end of a bidirectional thyristor Q2 is connected to a live wire N of alternating current, the other end of the bidirectional thyristor Q2 is connected to an LED power supply, and the input end of the LED power supply is connected to a zero line L of the alternating current.

The emergency power supply circuit comprises an MOS transistor Q4, an NPN triode Q3, a resistor R3, a resistor R1, a diode D3, a resistor R2, a capacitor C3, a diode D2, a capacitor C4, a voltage regulator tube Z2 and a resistor R4.

The input end of the low-voltage LED drive is connected to a MOS tube Q4, an NPN triode Q3 and a resistor R3 which are connected in series, the space between an NPN triode Q3 and a resistor R3 is coupled to the drain electrode of an MOS tube Q4 through a voltage regulator tube Z2, the space between the grid electrode of an MOS tube Q4 and a voltage regulator tube Z2 is connected to the source electrode of an MOS tube Q4 through a resistor R4, the two ends of the NPN triode Q4 and the two ends of the resistor R4 are connected in parallel with a storage battery, the two ends of the storage battery are connected in parallel with a resistor R4 and a diode D4, the two ends of the resistor R4 are connected in parallel with a capacitor C4, the base electrode of the NPN triode Q4 is coupled between the resistor R4 and the diode D4 through the resistor R4, the emitter electrode of the NPN triode Q4 is coupled to the resistor R4 through the capacitor C4, the two ends of the capacitor C4 are connected in parallel.

The utility model discloses a theory of operation and use flow: the utility model discloses when using, increase a charging control circuit, through its control, when the commercial power has a power failure, the voltage of closing the LED power earlier, discharge the time delay back through electric capacity C4 again, NPN triode Q3 closes, and MOS pipe Q4 switches on, and low pressure LED drive power supply works, and the LED lamp is bright. When the commercial power comes, after the capacitor C4 is charged to be larger than 0.7V, the NPN triode Q3 is conducted, the MOS tube Q4 is closed, the LED lamp is not lighted, when the capacitor C2 is charged to be larger than 5V1, the bidirectional thyristor Q2 is controlled to be conducted through the LED driving power supply, the LED power supply works, and the LED lamp is lighted. The circuit can effectively prevent the output of the emergency power supply and the output of the driving power supply from being simultaneously applied to the output lamp tube, prevent the current of the lamp tube from exceeding the rated current of the lamp tube and prolong the service life of the lamp tube.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a prevent too big circuit of fluorescent tube electric current for emergency light, includes LED power and LED lamp, its characterized in that: the output end of the LED power supply is connected in series with a diode D4 and an LED lamp, the two sides of the LED lamp are connected in parallel with a diode D5 and a low-voltage LED drive, the input end of the low-voltage LED drive is connected to an emergency power supply circuit, the two ends of the emergency power supply circuit are connected in parallel with a secondary coil winding T2B of a transformer T2, one end of a first primary winding T2A of the transformer T2 is coupled to an electric bridge BR1, the other end of the first primary winding T2A is coupled to the drain of a MOS tube Q1, the source of the MOS tube Q1 is grounded, the gate of the MOS tube Q1 is connected with PWM drive, the negative electrode of the electric bridge BR1 is grounded, the two alternating current output ends of the electric bridge BR1 are connected in parallel with a capacitor C1, the two ends of the capacitor C1 are connected in parallel with a transformer T1, the two ends of the transformer T1 are respectively connected to an alternating current positive electrode and a negative electrode, the two alternating current output ends of the electric bridge BR1 are connected in parallel with a capacitor C1, the LED driving power supply control circuit is characterized in that the capacitor C2 is coupled to an LED driving power supply control through a voltage stabilizer Z1, the input end of the LED driving power supply control is connected with a bidirectional thyristor Q2, one end of the bidirectional thyristor Q2 is connected to a live wire N of alternating current, the other end of the bidirectional thyristor Q2 is connected to an LED power supply, and the input end of the LED power supply is connected to a zero wire L of the alternating current.

2. A circuit for preventing excessive lamp current for an emergency lamp according to claim 1, wherein: the emergency power supply circuit comprises an MOS tube Q4, an NPN triode Q3, a resistor R3, a resistor R1, a diode D3, a resistor R2, a capacitor C3, a diode D2, a capacitor C4, a voltage regulator tube Z2 and a resistor R4.

3. A circuit for preventing excessive lamp current for an emergency lamp according to claim 1, wherein: the input end of the low-voltage LED drive is connected to a MOS tube Q4, an NPN triode Q3 and a resistor R3 which are connected in series, the space between the NPN triode Q3 and the resistor R3 is coupled to the drain electrode of the MOS tube Q4 through a voltage regulator tube Z2, the space between the grid electrode of the MOS tube Q4 and the voltage regulator tube Z2 is connected to the source electrode of the MOS tube Q4 through a resistor R4, the two ends of the NPN triode Q4 and the two ends of the resistor R4 are connected in parallel with a storage battery, the two ends of the storage battery are connected in parallel with a resistor R4 and a diode D4, the two ends of the resistor R4 are connected in parallel with a capacitor C4, the base of the NPN triode Q4 is coupled between the resistor R4 and the diode D4 through the resistor R4 and the diode D4, the emitter of the NPN triode Q4 is coupled to the resistor R4 through a capacitor C4, the two ends of the capacitor C4 are connected in parallel with a secondary winding T2.