CN203574921U

CN203574921U - Dimmable electrodeless lamp driving circuit

Info

Publication number: CN203574921U
Application number: CN201320765740.5U
Authority: CN
Inventors: 徐珺; 李维德
Original assignee: Shanghai Hongyuan Lighting & Electric Equipment Co Ltd
Current assignee: Shanghai Hongyuan Lighting & Electric Equipment Co Ltd
Priority date: 2013-11-27
Filing date: 2013-11-27
Publication date: 2014-04-30
Anticipated expiration: 2023-11-27

Abstract

The utility model provides a dimmable electrodeless lamp driving circuit. The dimmable electrodeless lamp driving circuit includes: a dimming controller, a half bridge inverter control chip, a first MOS pipe, a second MOS pipe, an inductor, a first capacitor, and a second capacitor. The dimming controller receives and detects an external direct current signal, and outputs a pulse width modulation signal; a frequency control pin of the half bridge inverter control chip and an output terminal of the dimming controller are connected to receive the pulse width modulation signal; the drain electrode of the first MOS pipe is connected with a power supply, and the gate electrode of the first MOS pipe is connected to a first output terminal of the half bridge inverter control chip; the drain electrode of the second MOS pipe is connected with the source electrode of the first MOS pipe, the gate electrode of the second MOS pipe is connected to a second output terminal of the half bridge inverter control chip, and the source electrode of the second MOS pipe is grounded; a first terminal of the inductor is connected with the source electrode of the first MOS pipe; a first terminal of the first capacitor is connected to a second terminal of the inductor, and a second terminal of the first capacitor is grounded; and a first terminal of the second capacitor is grounded, and a second terminal of the second capacitor and a first terminal of the first capacitor are connected with the electrodeless lamp. The dimmable electrodeless lamp driving circuit can use the relatively simple circuit to realize the dimming function of the electrodeless lamp.

Description

The drive circuit for electrodeless lamp of tunable optical

Technical field

The utility model relates to Non-polarized lamp Driving technique, relates in particular to a kind of drive circuit for electrodeless lamp of tunable optical.

Background technology

Non-polarized lamp is as the illuminating product of a kind of long-life, non-maintaining, high light efficiency and high-color rendering, by domestic and international market, accepted extensively, Non-polarized lamp product all has remarkable result in factory floor illumination, road/tunnel illumination and light projector floodlighting engineering.

The electromagnetic wave coupling that Non-polarized lamp is launched radio-frequency region by high frequency magnetic core excites the discharging substance (as mercury atom) in fluorescent tube, and then the ultraviolet ray (for example ultraviolet ray of 253.7nm) that mercury atom is launched can effectively excite the light of three primary colors or other spectrum components to throw light on.Because Non-polarized lamp itself does not have electrode, thereby can guarantee that it for example, under long-term (5 years or longer time) service condition, still possess stable, without features such as replacements.

Non-polarized lamp needs the drive circuits such as ballast to drive conventionally, comparatively complicated but drive circuit for electrodeless lamp of the prior art is realized the mode of dimming function.

Utility model content

The technical problems to be solved in the utility model is to provide a kind of drive circuit for electrodeless lamp of tunable optical, can realize with comparatively simple circuit the dimming function of Non-polarized lamp.

For solving the problems of the technologies described above, the utility model provides a kind of drive circuit for electrodeless lamp of tunable optical, comprising:

Light adjusting controller, receives and detects outside direct current signal, output pulse width modulation signal;

Half-bridge inverter control chip, its FREQUENCY CONTROL pin is connected to receive described pulse-width signal with the output of described light adjusting controller;

The first metal-oxide-semiconductor, its drain electrode connects power supply, and its grid connects the first output of described half-bridge inverter control chip;

The second metal-oxide-semiconductor, its drain electrode connects the source electrode of described the first metal-oxide-semiconductor, and its grid connects the second output of described half-bridge inverter control chip, its source ground;

Inductance, its first end connects the source electrode of described the first metal-oxide-semiconductor;

The first electric capacity, its first end connects the second end of described inductance, its second end ground connection;

The second electric capacity, its first end ground connection, the first end of its second end and described the first electric capacity is configured to be connected with Non-polarized lamp.

According to an embodiment of the present utility model, this drive circuit for electrodeless lamp also comprises: the 3rd electric capacity, its first end connects the FREQUENCY CONTROL pin of described half-bridge inverter control chip, its second end ground connection.

Compared with prior art, the utlity model has following advantage:

The drive circuit for electrodeless lamp of the utility model embodiment detects by the direct current signal to outside, the pulse-width signal that output duty cycle is variable, thus realize the dimming function of Non-polarized lamp.

Accompanying drawing explanation

Fig. 1 is the electrical block diagram of the drive circuit for electrodeless lamp of the utility model embodiment;

Fig. 2 is a kind of waveform schematic diagram of the pulse-width signal in the drive circuit for electrodeless lamp of the utility model embodiment;

Fig. 3 is the another kind of waveform schematic diagram of the pulse-width signal in the drive circuit for electrodeless lamp of the utility model embodiment.

Embodiment

Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail, but should not limit protection range of the present utility model with this.

With reference to figure 1, the drive circuit for electrodeless lamp of the present embodiment comprises: light adjusting controller 11, half-bridge inverter control chip 12, the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, inductance T1, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 0.Wherein, light adjusting controller 11 and half-bridge inverter control chip 12 can be any suitable chip or elements in prior art.

Furthermore, light adjusting controller 11 receives and detects outside direct current signal IN, output pulse width modulation (PWM) signal; The FREQUENCY CONTROL pin Ct of half-bridge inverter control chip 12 is connected with the output of light adjusting controller 11, receives this pulse-width signal; The drain electrode of the first metal-oxide-semiconductor Q1 connects power supply, and the grid of the first metal-oxide-semiconductor Q1 connects the first output of half-bridge inverter control chip 12; The drain electrode of the second metal-oxide-semiconductor Q2 connects the source electrode of the first metal-oxide-semiconductor Q1, and the grid of the second metal-oxide-semiconductor Q2 connects the second output of half-bridge inverter control chip 12, the source ground of the second metal-oxide-semiconductor Q2; The first end of inductance T1 connects the source electrode of the first metal-oxide-semiconductor Q1; The first end of the first capacitor C 1 connects the second end of inductance T1, the second end ground connection of the first capacitor C 1; The first end ground connection of the second capacitor C 2, the second end of the second capacitor C 2 and the first end of the first capacitor C 1 are configured to be connected with Non-polarized lamp 10; The first end of the 3rd capacitor C 0 connects the FREQUENCY CONTROL pin Ct of half-bridge inverter control chip 12, the second end ground connection of the 3rd capacitor C 0.In addition, light adjusting controller 11 can also receive its voltage range of electric main input signal AC(and for example can reach 85V～305V).By changing the capacitance of the 3rd capacitor C 0 that FREQUENCY CONTROL pin Ct connects, frequency that can regulation output signal.

The course of work of this drive circuit for electrodeless lamp is as follows: light adjusting controller 11 is by detecting the power of outside direct current signal IN, output pulse width modulation signal is to the FREQUENCY CONTROL pin Ct of half-bridge inverter control chip 12, and then the turn-on and turn-off time of control metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2; ON time is long, and the power of Non-polarized lamp 10 is higher, otherwise ON time is short, and power of lamp tube is lower.Wherein, the duty ratio of the pulse-width signal that the ON time of metal-oxide-semiconductor Q1 and Q2 can produce with light adjusting controller 11 is directly proportional, and duty ratio is larger, and ON time is longer.

Particularly, the operation principle of the drive circuit for electrodeless lamp of the present embodiment is as follows: light adjusting controller 11 is strong and weak (for example by detecting outside d. c. voltage signal IN, the variable range of this signal is DC 0～10V), the be added to FREQUENCY CONTROL pin Ct of half-bridge inverter control chip of the pulse-width signal of its output is upper during for high level, half-bridge inverter control chip quits work, when light adjusting controller 11 detects the direct current DC voltage of d. c. voltage signal IN when higher, the be added to upper high level lasting time of FREQUENCY CONTROL pin Ct of half-bridge inverter control chip 12 of the pulse-width signal of its output is just longer, as shown in the region 21 in Fig. 2, it is just longer that half-bridge inverter control chip 12 stops time of output, at this moment the power of fluorescent tube is just lower.When the be added to FREQUENCY CONTROL pin Ct of half-bridge inverter control chip 12 of pulse-width signal upper during for low level, half-bridge inverter control chip 12 is started working again, when light adjusting controller 11 detects the direct current DC voltage of d. c. voltage signal IN when lower, the be added to upper high level lasting time of FREQUENCY CONTROL pin Ct of half-bridge inverter control chip of the pulse-width signal of its output is just shorter, as shown in the region 31 in Fig. 3, it is just shorter that half-bridge inverter control chip 12 stops the time of output, and at this moment the power of fluorescent tube is just higher.

Further, in fact the pulse-width signal of light adjusting controller 11 output (is for example added to the switching signal that just changes when the process of FREQUENCY CONTROL pin Ct of half-bridge inverter control chip 12 is equivalent to the adjustable and level of duty ratio, the switching signal frequency that this low and high level changes can be generally 150Hz～3KHz, voltage magnitude can be 0V or 5V conversion, following high level is 5V, low level is 0V), this pulse-width signal high level is added on FREQUENCY CONTROL pin Ct, when now the voltage on the FREQUENCY CONTROL pin Ct of half-bridge inverter control chip 12 is just higher than the operating voltage Vcc of its chip, half-bridge inverter control chip 12 just stops output, and the pulse-width signal high level lasting time on the FREQUENCY CONTROL that is added to pin Ct is longer (because this pulse-width signal is also a switching signal that duty ratio is adjustable, on the FREQUENCY CONTROL pin Ct that is added to, the pulse-width signal high level lasting time of (being capacitor C 0) is longer, the FREQUENCY CONTROL pin Ct(that ought be added to is so capacitor C 0) on pulse-width signal low duration shorter), will make half-bridge inverter control chip 12 stop the time lengthening of output, at this moment the power of fluorescent tube will step-down.When being added to, FREQUENCY CONTROL pin Ct(is capacitor C 0) on pulse-width signal high level lasting time shorter (because this pulse-width signal is also a switching signal that duty ratio is adjustable, when being added to, FREQUENCY CONTROL pin Ct(is capacitor C 0) on pulse-width signal high level lasting time shorter, the FREQUENCY CONTROL pin Ct(that ought be added to is so capacitor C 0) on pulse-width signal low duration longer), the time that will make half-bridge inverter control chip 12 stop output shortening, and at this moment the power of fluorescent tube will uprise.

It should be noted that, in Fig. 2 and Fig. 3, low level be take 0V as example, and high level be take 5V as example, but it will be appreciated by those skilled in the art that the scope of low and high level is not limited to this.Due to light adjusting controller output be pulse-width signal, so high level (31 places, 21He region, the region) duration is longer, lasting time of low level (32 places, 22He region, region) is just shorter so.

Although the utility model with preferred embodiment openly as above; but it is not for limiting the utility model; any those skilled in the art are not within departing from spirit and scope of the present utility model; can make possible change and modification, the scope that therefore protection range of the present utility model should be defined with the utility model claim is as the criterion.

Claims

1. a drive circuit for electrodeless lamp for tunable optical, is characterized in that, comprising:

2. drive circuit for electrodeless lamp according to claim 1, is characterized in that, also comprises: the 3rd electric capacity, its first end connects the FREQUENCY CONTROL pin of described half-bridge inverter control chip, its second end ground connection.