CN211128274U

CN211128274U - Frequency sweep frequency preheating soft start circuit of discharge lamp

Info

Publication number: CN211128274U
Application number: CN201921872623.2U
Authority: CN
Inventors: 袁成毅
Original assignee: Foshan Yuejia Electronic Technology Co ltd
Current assignee: Foshan Yuejia Electronic Technology Co ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-07-28
Anticipated expiration: 2029-11-04

Abstract

The utility model discloses a soft start circuit is preheated in discharge lamp frequency sweep, preheat soft start circuit including the sweep and with the chip U that soft start circuit output is connected is preheated to the sweep, the sweep preheats soft start circuit and includes chip power VCC, electric capacity C4, resistance R8, resistance R6, electric capacity C6, diode D5, triode Q6, diode D6, resistance R9 and resistance R11, wherein, resistance R6's one end is connected with diode D5's negative pole and is connected with chip power VCC, resistance R6's the other end respectively with diode D5 positive pole, electric capacity C6's one end and triode Q6's base are connected. Has the advantages that: according to the setting of values for C6 and R6, R9 and R11, convenience is provided for obtaining proper preheating time, preheating frequency and operating frequency, and convenience is provided for providing proper preheating time, preheating frequency and operating frequency for the ballast of the ultraviolet lamp.

Description

Frequency sweep frequency preheating soft start circuit of discharge lamp

Technical Field

The utility model relates to a gas discharge lamp technical field particularly, relates to a soft start circuit is preheated to discharge lamp frequency sweep frequency.

Background

Since the general lighting is rapidly transiting from the discharge lamp age to the L ED solid lighting age, the whole industry chain is all inclined to the L ED industry chain, but in some special fields, such as the field of ultraviolet lamps (UV lamps), the traditional electronic ballast is still needed to be matched with the ultraviolet lamps for lighting, but because the whole industry chain is inclined to the L ED industry chain, the upstream special chip of the UV lamp electronic ballast is almost all in a production stop state, so that the electronic ballast is in a state that no special chip is available, and as the UV lamps belong to gas discharge lamps, in order to prolong the service life of the lamps and better start the lamps, the electronic ballast needs a preheating soft start process in the starting process, and the switching frequency of a half-bridge circuit is required to be adjusted from high to low within the preheating start time in the prior art, the preheating soft start circuit is complicated and has high cost.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

To the problem among the correlation technique, the utility model provides a discharge lamp frequency sweep preheats soft start circuit to overcome the above-mentioned technical problem that current correlation technique exists.

Therefore, the utility model discloses a specific technical scheme as follows:

a frequency sweep preheating soft start circuit of a discharge lamp comprises a sweep preheating soft start circuit and a chip U connected with an output end of the sweep preheating soft start circuit, wherein the sweep preheating soft start circuit comprises a chip power supply VCC, a capacitor C4, a resistor R8, a resistor R6, a capacitor C6, a diode D5, a triode Q6, a diode D6, a resistor R9 and a resistor R11, one end of the resistor R6 is connected with a negative electrode of the diode D5 and is connected with the chip power supply VCC, the other end of the resistor R6 is connected with a positive electrode of the diode D5, one end of the capacitor C6 and a base electrode of the triode Q6 respectively, an emitter electrode of the triode Q6 is connected with a negative electrode of the diode D6, an anode of the diode D6 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with one end of the resistor R11 and is connected with a sixth pin of the chip U, the other end of the resistor R11 is connected with one end of the capacitor C4, the collector of the triode Q6 and the other end of the capacitor C6 respectively and is grounded, the other end of the capacitor C4 is connected with one end of the resistor R8 and is connected with a fifth pin of the chip U, and the other end of the resistor R8 is connected with a seventh pin of the chip U.

Further, the diode D5 and the diode D6 are both 1N4148 diodes, and the diode D5 and the diode D6 are both switching diodes.

Further, the type of the triode Q6 is a 2N3906 triode, and the triode Q6 is a PNP triode.

Further, the capacitance of the capacitor C6 is 100 microfarads, the capacitance of the capacitor C4 is coded as 102, and the capacitance of the capacitor C4 is 1000 picofarads.

Furthermore, the capacitor C6 is a polar capacitor, the anode of the capacitor C6 is connected to the base of the transistor Q6, and the cathode of the capacitor C6 is grounded.

Further, the resistor R11 is a chip timing resistor, the resistance of the resistor R8 is 200 ohms, the resistance of the resistor R11 is 15 kilo-ohms, the resistance of the resistor R9 is 2.2 kilo-ohms, and the resistance of the resistor R6 is 300 kilo-ohms.

The utility model has the advantages that: through the characteristics of R6 and C6, the process of Q6 from on to off is a linear change process, so that the oscillation frequency of the chip U is swept from the highest value to the lowest value linearly, a perfect sweep frequency curve can be obtained, and the values of C6, R6, R9 and R11 are set, so that convenience is provided for obtaining proper preheating time, preheating frequency and working frequency, and the proper preheating time, preheating frequency and working frequency are provided for the ballast of the ultraviolet lamp.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a frequency-sweep preheating soft start circuit of a discharge lamp according to an embodiment of the present invention.

Detailed Description

For further explanation of the embodiments, the drawings are provided as part of the disclosure and serve primarily to illustrate the embodiments and, together with the description, to explain the principles of operation of the embodiments, and to provide further explanation of the invention and advantages thereof, it will be understood by those skilled in the art that various other embodiments and advantages of the invention are possible, and that elements in the drawings are not to scale and that like reference numerals are generally used to designate like elements.

According to the utility model discloses an embodiment provides a discharge lamp frequency sweep preheats soft start circuit.

Referring now to the drawings and the detailed description, as shown in fig. 1, a frequency-sweep preheating soft start circuit of a discharge lamp according to an embodiment of the present invention includes a frequency-sweep preheating soft start circuit and a chip U connected to an output end of the frequency-sweep preheating soft start circuit, where the frequency-sweep preheating soft start circuit includes a chip power VCC, a capacitor C4, a resistor R8, a resistor R6, a capacitor C6, a diode D5, a transistor Q6, a diode D6, a resistor R9, and a resistor R11, where one end of the resistor R6 is connected to a negative electrode of the diode D5 and to the chip power VCC, the other end of the resistor R6 is connected to an anode of the diode D5, one end of the capacitor C6, and a base of the transistor Q6, an emitter of the transistor Q6 is connected to a negative electrode of the diode D6, an anode of the diode D6 is connected to one end of the resistor R9, the other end of the resistor R9 is connected with one end of the resistor R11 and connected with a sixth pin of the chip U, the other end of the resistor R11 is respectively connected with one end of the capacitor C4, the collector of the triode Q6 and the other end of the capacitor C6 and grounded, the other end of the capacitor C4 is connected with one end of the resistor R8 and connected with a fifth pin of the chip U, and the other end of the resistor R8 is connected with a seventh pin of the chip U.

By means of the technical scheme, the process of turning on and turning off the Q6 is a linear change process through the characteristics of the R6 and the C6, so that the oscillation frequency of the chip U is swept from the highest value to the lowest value linearly, a perfect sweep frequency curve can be obtained, and the proper preheating time, preheating frequency and working frequency are conveniently obtained and provided for the ballast of the ultraviolet lamp according to the setting of the values of the C6, the R6, the R9 and the R11.

In one embodiment, for the diode D5, the diode D5 and the diode D6 are both 1N4148 diodes, the diode D5 and the diode D6 are both switching diodes, basic parameters of the switching diodes are Vrm-75V, If-150 mA, Vf-1V, Trr-4 ns and C0-4 pf, Trr is recovery time, and C0 is zero-bias capacitance.

In one embodiment, for transistor Q6 described above, transistor Q6 is a 2N3906 transistor and transistor Q6 is a PNP transistor.

In one embodiment, for the capacitor C6 described above, the capacitance of the capacitor C6 is 100 microfarads, the capacitance of the capacitor C4 is coded as 102, and the capacitance of the capacitor C4 is 1000 picofarads.

In one embodiment, for the capacitor C6, the capacitor C6 is a polar capacitor, the positive electrode of the capacitor C6 is connected to the base of the transistor Q6, and the negative electrode of the capacitor C6 is grounded.

In an embodiment, for the resistor R11, the resistor R11 is a chip timing resistor, the resistor R8 has a resistance of 200 ohms, the resistor R11 has a resistance of 15 kohms, the resistor R9 has a resistance of 2.2 kohms, and the resistor R6 has a resistance of 300 kohms.

The working principle is as follows: when in use, firstly, the power is supplied, and C6 aluminum electrolysis is charged through R6; at the moment, because the voltage at the two ends of the aluminum electrolysis C6 cannot be suddenly changed, the base voltage of the Q6 is nearly zero, the Q6 is in a conducting state at the moment, the CE-level impedance of the Q6 is very low, the R9 and the R11 are connected in parallel, the timing oscillation resistance of the chip U is equal to the resistance value of the R9 and the R11 which are connected in parallel, the value is far lower than that of the R11, and the oscillation frequency of the chip U is the highest value at the moment; after power-on, VCC of the chip U gradually charges C6 through R6, voltage at two ends of C6 gradually rises, base voltage of Q6 gradually rises, due to the characteristic of a PNP type triode, Q6 gradually exits from a conducting state, time from conducting to exiting conducting of Q6 depends on values of C6 and R6, when C6 is fully charged, base voltage of Q6 exceeds 0.7V, Q6 completely exits from conducting, and then timing resistance of the chip U only remains R11; the frequency returns to the value set normally; due to the characteristics of R6 and C6, the process of turning on and off the Q6 is a linear change process, so that the oscillation frequency of the chip U is linearly swept from the highest value to the lowest value, and a perfect sweep frequency curve can be obtained.

In summary, with the aid of the technical solution of the present invention, through the characteristics of R6 and C6, the process of Q6 from turning on to turning off is a linear process, so that the oscillation frequency of the chip U is swept from the highest value to the lowest value linearly, a perfect sweep frequency curve can be obtained, and according to the values set for C6, R6, R9 and R11, convenience is provided for obtaining a proper preheating time, preheating frequency and operating frequency, and convenience is provided for providing a proper preheating time, preheating frequency and operating frequency for the ballast of the ultraviolet lamp.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A frequency sweep preheating soft start circuit of a discharge lamp is characterized by comprising a sweep preheating soft start circuit and a chip U connected with an output end of the sweep preheating soft start circuit, wherein the sweep preheating soft start circuit comprises a chip power supply VCC, a capacitor C4, a resistor R8, a resistor R6, a capacitor C6, a diode D5, a triode Q6, a diode D6, a resistor R9 and a resistor R11, one end of the resistor R6 is connected with a negative electrode of the diode D5 and connected with the chip power supply VCC, the other end of the resistor R6 is respectively connected with a positive electrode of the diode D5, one end of the capacitor C6 and a base electrode of the triode Q6, an emitter electrode of the triode Q6 is connected with a negative electrode of the diode D6, a positive electrode of the diode D6 is connected with one end of a resistor R9, the other end of a resistor R9 is connected with one end of the resistor R11 and connected with a sixth pin of the chip U, the other end of the resistor R11 is connected with one end of the capacitor C4, the collector of the triode Q6 and the other end of the capacitor C6 respectively and is grounded, the other end of the capacitor C4 is connected with one end of the resistor R8 and is connected with a fifth pin of the chip U, and the other end of the resistor R8 is connected with a seventh pin of the chip U.

2. A frequency swept preheat soft start circuit for a discharge lamp as claimed in claim 1, wherein the diode D5 and the diode D6 are both 1N4148 diodes, and the diode D5 and the diode D6 are both switching diodes.

3. A frequency swept preheat soft start circuit for a discharge lamp as claimed in claim 1, wherein the transistor Q6 is a 2N3906 transistor and the transistor Q6 is a PNP transistor.

4. A frequency swept preheat soft start circuit for a discharge lamp as claimed in claim 1, wherein the capacitance of the capacitor C6 is 100 microfarads, the capacitance of the capacitor C4 is coded as 102, and the capacitance of the capacitor C4 is 1000 picofarads.

5. A frequency swept preheat soft start circuit for a discharge lamp as claimed in claim 1, wherein the capacitor C6 is a polar capacitor, the anode of the capacitor C6 is connected to the base of the transistor Q6, and the cathode of the capacitor C6 is grounded.

6. A frequency swept preheating soft start circuit of a discharge lamp as claimed in claim 1, wherein the resistor R11 is a chip timing resistor, the resistance of the resistor R8 is 200 ohms, the resistance of the resistor R11 is 15 kilo-ohms, the resistance of the resistor R9 is 2.2 kilo-ohms, and the resistance of the resistor R6 is 300 kilo-ohms.