CN1284422C

CN1284422C - Low-harmonic compact type energy-saving lamp electronic ballast

Info

Publication number: CN1284422C
Application number: CN 01114463
Authority: CN
Inventors: 邓树兴
Original assignee: Individual
Current assignee: SHENZHEN SANYE LIGHTING TECHNOLOGY Co Ltd
Priority date: 2001-05-16
Filing date: 2001-05-16
Publication date: 2006-11-08
Anticipated expiration: 2021-05-16
Also published as: WO2002093985A1; CN1386040A

Abstract

The present invention relates to a low-harmonic compact electronic ballast for energy-saving lamps, which is composed of a double-pi electromagnetic interference filter circuit 1 for power input, an AC-to-DC bridge rectifier circuit 2, a high-low frequency overlapping passive rectification filter circuit 3 for power factor correction, a high-frequency oscillation DC-to-AC inverter circuit 4 and a resonant capacitance circuit 5 of a filament. The electronic ballast is connected with straight fluorescent lamp tubes or fluorescent lamp tubes in a U shape or other forms, etc. when used, the harmonic content of input current is lower than 30%, the waveform distortion is extremely small, and the safe and economic operation of an electric network can be ensured; the input power factor is bigger than 0.95, and the wave peak ratio of lamp current is lower than 1.7. An assembled energy-saving lamp has the advantages of small size, low cost and reliable work.

Description

A kind of low-harmonic compact type energy-saving lamp electronic ballast

The present invention relates to a kind of electronic-circuit device that is used for fluorescent lamp control, be meant a kind of low-harmonic compact type energy-saving lamp electronic ballast especially.

Compact type energy-saving lamp (CFL) has become the main body of contemporary Green Lighting Project with advantages such as its energy-conservation, high light efficiency, easy to use, price are suitable, but simultaneously because " electricity-saving lamp " self circuit reason, to cause input current waveform to produce distortion inevitably, and this distortion will pollute with the form of current harmonics to " common frequency power network ".When reaching a certain amount of, this pollution will cause supply line's voltage waveform distortion, center line heating, and transformer and cable overload, circuit power consumption equipment and motor can't operate as normal, even cause fire.The current harmonics total content of ordinary electronic electricity-saving lamp is often more than 120%, and power factor only about 0.5.Therefore no matter from the safety and economic operation that ensures electrical network still from protection power consumption equipment and personal safety, current harmonic content that all must strict restriction electricity-saving lamp is to reduce the serious harm that harmonic pollution causes.Improving the input power factor of compact type energy-saving lamp (self-ballasted fluorescent lamp) electric ballast and the circuit engineering scheme of reduction Harmonics of Input at present is mainly: Active Power Factor Correction and PPFC (Passive Power Factor Correction) two class circuit.Their shortcoming is, the former circuit structure complexity, volume is big, cost is high; And the latter, or Harmonics of Input content height, still do not meet " C " class lighting apparatus harmonic wave limit value requirement of IEC6100-3-2 electromagnetic field compatibility standard regulation, or then functional reliability is poor, debugging difficulty is big, is difficult to practicality.

In view of this, purpose of the present invention, be to provide a kind of can realize High Power Factor, and Harmonics of Input meets the IEC6100-3-2 standard-required, and volume is little, cost is low, functional reliability is high, particularly be fit to a kind of low-harmonic compact type energy-saving lamp electronic ballast that small-power (5W-30W) self-ballasted fluorescent lamp (compact type energy-saving lamp) is used.

Referring to Fig. 1 the present invention electricity functional-block diagram, technical solution of the present invention is as follows.The present invention has the two π type electromagnetic interference filter circuit 1 of power supply input, interchange → direct current bridge rectifier 2, higher-order of oscillation direct current → AC inverter circuit 4, wherein the two π type electromagnetic interference filter circuit 1 of power supply input are delivered to interchange → direct current bridge rectifier 2 with AC supply voltage after the filtering electromagnetic interference, it is characterized in that, also have low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit 3 and filament resonant capacitance circuit 5, interchange → direct current bridge rectifier 2 changes alternating voltage into pulsating dc voltage and is delivered to low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit 3, one high-frequency modulation signal of filament resonant capacitance circuit 5 feedback outputs simultaneously is to low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit 3, the signal of 3 pairs of stack inputs of low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit carries out the low-and high-frequency modulation and does to be delivered to the dc supply of higher-order of oscillation direct current → AC inverter circuit 4 as this circuit behind the rectifying and wave-filtering, and higher-order of oscillation direct current → AC inverter circuit 4 carries out the higher-order of oscillation and gives filament resonant capacitance circuit 5 with high-frequency modulation signal.Have foregoing circuit structure and signal flow to the present invention in use, its filament resonant capacitance circuit 5 is connected with the filament of the fluorescent tube 6 of straight pipe type or U type or other type, higher-order of oscillation direct current → high-frequency modulation signal that AC inverter circuit 4 produces is transported to the filament of fluorescent tube 6 through filament resonant capacitance circuit 5, make fluorescent tube 6 luminous lightings, thereby finish the overall process that electric ballast of the present invention drives electricity-saving lamp work.

Adopt the compact type energy-saving lamp of electric ballast assembling of the present invention to have following advantage and characteristics: 1. to guarantee the power grid security economical operation: because its Harmonics of Input total content is less than 30%, harmonic content meets " C " class lighting apparatus harmonic wave limit value requirement of IEC6100-3-2 electromagnetic compatibility standard regulation, and lamp current crest ratio is less than 1.7, therefore the input current waveform distortion is minimum, pollution-free to electrical network, reduced the generation of disaster hidden-trouble and contingency.2. reduce reactive loss, further energy-conservation: input power factor is up to 0.95, and input current reduces by 50% than general electricity-saving lamp under with constant power and equal illumination conditions.3. power consumption equipment there is not electromagnetic interference substantially: be specially adapted to senior place such as communication, finance, aviation, railway, star hotel, hospital, precision instrument room, computer room, reception and launching centre, Head of Government office and use.4. reduce the spoilage in blocks of electricity-saving lamp: when common energy-saving lamp is installed use concentratedly, because harmonic wave severe overweight, very easily form voltage standing wave(VSW) point (series resonance) in the part, the transient voltage stack will cause electricity-saving lamp to burn in flakes, so user even manufacturer are often not clear, generally be attributed to the electricity-saving lamp poor quality, essence then is that harmonic wave does mischief, and then there is not this type of problem in the present invention.5. vision protection, ensure healthy: operating frequency designs more than 40KHZ, has reduced the stroboscopic effect of electricity-saving lamp to greatest extent, reaches the level of " eye-protecting lamp ", has effectively protected the illumination work environmentAL safety.6. use that small-power of the present invention (5W-30W) self-ballasted fluorescent lamp (compact type energy-saving lamp) volume is little, cost is low, functional reliability is high.

Below in conjunction with drawings and Examples the present invention is made and to further specify.

Fig. 1 is the present invention's electricity functional-block diagram;

Fig. 2 is the embodiment of a kind of physical circuit of Fig. 1 block diagram.

Referring to Fig. 1 and Fig. 2.The two π type electromagnetic interference filter circuit 1 of power supply input are by protective tube BX, capacitor C 1 connects to form with L2 with C2 and inductance L 1, interchange → direct current bridge rectifier 2 is connected to form by diode D1 to D4, low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit 3 is connected to form by capacitor C 3 to C6 and diode D5, higher-order of oscillation direct current → AC inverter circuit 4 is by large power triode Q1 and Q2, bidirectional diode DB3, diode D6 to D10, resistance R 1 is to R6, capacitor C 7 and C8, oscillation transformer L3～L5 and inductance L 6 connect to form, and filament resonant capacitance circuit 5 is made up of with C10 capacitor C 9.

Low-and high-frequency of the present invention stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit 3 with the annexation of other circuit is: C3, C4 and D5 positive pole connect end altogether and exchange → output cathode of direct current bridge rectifier 2 is electrically connected, hold the connecting altogether of C3, C5 and C6 negative pole and exchange → output negative pole of direct current bridge rectifier 2 is electrically connected; The end that connects altogether of R1, the R2, C8, D7 negative pole and the Q1 collector electrode that connect end and higher-order of oscillation direct current → AC inverter circuit 4 altogether of D5 negative pole, C6 positive pole is electrically connected, positive pole as the dc supply of this circuit 4, the end that connects altogether that connects end and C7, D8 positive pole, R4, D10 positive pole and the L4 of higher-order of oscillation direct current → AC inverter circuit 4 altogether of C3, C5 and C6 negative pole is electrically connected, as the negative pole of the dc supply of this circuit 4.The capacitance span of C3, C4, C5 is 1000Pf～0.5 μ f, and the capacitance of C5 is 1/10～1/100 of C4, and the capacitance span of C6 is 4.7 μ f～100 μ f, and D5 adopts the high-frequency rectification diode.

Filament resonant capacitance circuit 5 of the present invention with the annexation of other circuit is: L6 one end of the end of C10 and higher-order of oscillation direct current → AC inverter circuit 4 is electrically connected, and the end that connects altogether of C4, the C5 of the end of C9 and low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit 3 is electrically connected.The electric capacity span of C9, C10 is 500Pf-0.05 μ f, and the capacitance of C9 equals the capacitance of C10.

The present invention with circuit structure shown in Figure 2 in the pass that the filament with straight pipe type or U type or other type fluorescent tube 6 is connected is: the end that connects end and one group of cathode filament of fluorescent tube 6 altogether of C10, L6 is electrically connected, and the end of C9 then is electrically connected with the other end of this group cathode filament; The other end of C10 and fluorescent tube 6 another the group cathode filament an end be electrically connected, C9, C4, C5 connect altogether end then with this another the group cathode filament the other end be electrically connected.

The technical scheme of low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit 3 of the present invention is different from known " by streaming " or PPFC (Passive Power Factor Correction) filter circuits such as " pump formulas ", its course of work is the high-frequency modulation signal with higher-order of oscillation direct current → inverter circuit 4, through C4, C5, the pi-network that C3 constitutes feeds back to the direct current of interchange → direct current bridge rectifier 2 and is just exporting, negative pole, high frequency is superimposed upon on the unidirectional dc pulse moving voltage of low frequency (100HZ or 120HZ), export C6 to through the D5 rectification then and carry out filtering, improve the angle of flow of the diode D1～D4 of interchange → direct current bridge rectifier 2 with this, make that input current waveform is approaching or it is sinusoidal wave to reach, thereby reduce the Harmonics of Input of compact type energy-saving lamp electronic ballast greatly.

The resonant capacitance of filament resonant capacitance circuit 5 of the present invention is intersected respectively by C9, C10 and composes in parallel behind the cathode filament by fluorescent tube 6, purpose is the cathode filament electric current of adjusting by fluorescent tube 6, improve the light electrical efficiency, improve starting performance, prolonging lamp tube service life, the fluorescent tube operate as normal life-span was greater than 8000 hours.

Claims

1, a kind of low-harmonic compact type energy-saving lamp electronic ballast, have the two π type electromagnetic interference filter circuit (1) of power supply input, interchange → direct current bridge rectifier (2), higher-order of oscillation direct current → AC inverter circuit (4), wherein the two π type electromagnetic interference filter circuit (1) of power supply input are delivered to interchange → direct current bridge rectifier (2) with AC supply voltage after the filtering electromagnetic interference, it is characterized in that, also have low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit (3) and filament resonant capacitance circuit (5), interchange → direct current bridge rectifier (2) changes alternating voltage into pulsating dc voltage and is delivered to low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit (3), filament resonant capacitance circuit (5) feedback output one high-frequency modulation signal is to the PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit (3) that just superposes simultaneously, the signal that low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit (3) is imported stack carries out the low-and high-frequency modulation and does to be delivered to the dc supply of higher-order of oscillation direct current → AC inverter circuit (4) as this circuit behind the rectifying and wave-filtering, and higher-order of oscillation direct current → AC inverter circuit (4) carries out the higher-order of oscillation and gives filament resonant capacitance circuit (5) with high-frequency modulation signal.

2, a kind of low-harmonic compact type energy-saving lamp electronic ballast according to claim 1 is characterized in that:

A) the two π type electromagnetic interference filter circuit (1) of power supply input are by protective tube BX, capacitor C 1 connects to form with L2 with C2 and inductance L 1, interchange → direct current bridge rectifier (2) is connected to form by diode D1 to D4, low-and high-frequency stack PPFC (Passive Power Factor Correction) rectification filter circuit (3) is connected to form by capacitor C 3 to C6 and diode D5, higher-order of oscillation direct current → AC inverter circuit (4) is by large power triode Q1 and Q2, bidirectional diode DB3, diode D6 to D10, resistance R 1 is to R6, capacitor C 7 and C8, oscillation transformer L3～L5 and inductance L 6 connect to form, and filament resonant capacitance circuit (5) is made up of with C10 capacitor C 9;

B) BX, the C1 of the two towering type electromagnetic interference filter circuit (1) of power supply input and the end of L1 connect mutually altogether, and the other end of C1 links to each other with the end of L2, and the other end of L1 links to each other with the end of C2, and the other end of L2 links to each other with the other end of C2; The positive pole of the D1 of interchange → direct current bridge rectifier (2) links to each other with the negative pole of D2, and the positive pole of D3 links to each other with the negative pole of D4, and the negative pole of D1 links to each other as output cathode with the negative pole of D3, and the positive pole of D2 links to each other as output negative pole with the positive pole of D4; The annexation of two towering type electromagnetic interference filter circuit (1) of power supply input and exchanging → direct current bridge rectifier (2) is that the link of L1 and C2 connects mutually altogether with the link of D1 and D2; The link of L2 and C2 connects mutually altogether with the link of D3 and D4;

C) low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit (3) with the annexation of other circuit is: C3, C4 and D5 positive pole connect end altogether and exchange → output cathode of direct current bridge rectifier (2) is electrically connected, hold the connecting altogether of C3, C5 and C6 negative pole and exchange → output negative pole of direct current bridge rectifier (2) is electrically connected; The end that connects altogether of R1, the R2, C8, D7 negative pole and the Q1 collector electrode that connect end and higher-order of oscillation direct current → AC inverter circuit (4) altogether of D5 negative pole, C6 positive pole is electrically connected, positive pole as the dc supply of this circuit (4), the end that connects altogether that connects end and C7, D8 positive pole, R4, D10 positive pole and the L4 of higher-order of oscillation direct current → AC inverter circuit (4) altogether of C3, C5 and C6 negative pole is electrically connected, as the negative pole of the dc supply of this circuit (4);

D) filament resonant capacitance circuit (5) with the annexation of other circuit is: L6 one end of the end of C10 and higher-order of oscillation direct current → AC inverter circuit (4) is electrically connected, and the end that connects altogether of C4, the C5 of the end of C9 and low-and high-frequency stack PPFC (Passive Power Factor Correction) current rectifying and wave filtering circuit (3) is electrically connected.

3, a kind of low-harmonic compact type energy-saving lamp electronic ballast according to claim 2, it is characterized in that, the capacitance span of C3, C4, C5 is 1000Pf～0.5 μ f, and the capacitance of C5 is 1/10～1/100 of C4, and the capacitance span of C6 is 4.7 μ f～100 μ f; The electric capacity span of C9, C10 is 500Pf-0.05 μ f, and the capacitance of C9 equals the capacitance of C10.