CN102647840A - Electric-discharge lamp lightening device and illumination device comprising same - Google Patents
Electric-discharge lamp lightening device and illumination device comprising same Download PDFInfo
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- CN102647840A CN102647840A CN2011100430580A CN201110043058A CN102647840A CN 102647840 A CN102647840 A CN 102647840A CN 2011100430580 A CN2011100430580 A CN 2011100430580A CN 201110043058 A CN201110043058 A CN 201110043058A CN 102647840 A CN102647840 A CN 102647840A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention provides an electric-discharge lamp lightening device which comprises an inverter circuit (103), two direct-current voltage detection circuits (a, b), a direct-current voltage difference detection circuit (105), and a control circuit part (107); the inverter circuit (103) is used for converting direct-current voltage into alternating-current voltage so as to provide high-frequency alternating-current power for a load of an electric-discharge lamp to lighten the electric-discharge lamp; the two direct-current voltage detection circuits (a, b) are respectively connected with two ends of the load of the electric-discharge lamp and are used for detecting the direct-current voltages of the two ends of the load of the electric-discharge lamp; the direct-current voltage difference detection circuit (105) is formed between the two direct-current voltage detection circuits (a, b), and is used for detecting the difference between the direct-current voltages respectively detected by the two direct-current voltage detection circuits (a, b); and the control circuit part (107) is connected with the direct-current voltage difference detection circuit (105), and is used for stopping the action of the inverter circuit (103) or inhibiting the output of the inverter circuit (103) when the difference between the direct-current voltages, detected by the direct-current voltage difference detection circuit (105), is over a rated value.
Description
Technical field
The present invention relates to a kind of lighting apparatus for discharge lamp and the lighting apparatus that comprises this lighting apparatus for discharge lamp; Poor between the direct voltage at the place, two ends through detecting the discharge lamp load detects the protection of not launching single transmit phenomenon particularly and inverter circuit being stipulated of discharge lamp load.
Background technology
In existing lighting apparatus for discharge lamp; When (break down in the discharge lamp load and become under the situation of not launching) appears when unusual in the discharge lamp load; Mostly use voltage from the discharge lamp load, or the position that different voltages with different produces during with regular event when unusual is detected and testing result is transformed to the signal of telecommunication of regulation, the method that the protection that puts rules into practice is then moved.In the discharge lamp load, particularly the fluorescent lamp load is according to environment temperature, and its characteristic can change.Usually, the highest in so-called normal temperature (25 deg.c) by the luminous flux that discharge lamp produced, when environment temperature when normal temperature departs from, reduce by the luminous flux that discharge lamp produced, and the electrical characteristics of discharge lamp load also change.For example, the voltage of fluorescent lamp load (modulating voltage) is the highest at normal temperatures, and when when normal temperature departs from, modulating voltage reduces.
Become not method for transmitting as detecting the discharge lamp load, usually, adopted the method for the control of stipulating through the variation that detects this modulating voltage.But modulating voltage has like above-mentioned temperature characterisitic, under the situation of the variation of considering environment temperature, can't obtain the load discrimination precision when not launching just often fully.
In order to solve such problem, various motions have been proposed.
For example, patent documentation 1 discloses the lighting apparatus for discharge lamp that is used to solve such problem.
The summary that Fig. 8 and Fig. 9 show patent documentation 1 disclosed lighting apparatus for discharge lamp respectively constitutes and concrete formation example.
Like Fig. 8 and shown in Figure 9, in this lighting apparatus for discharge lamp, not only comprise the tube voltage test section, also comprise the non-symmetric component test section.When so-called single transmit, the non-symmetric component test section of the non-symmetric component of load detects the direct voltage composition of discharge lamp load during by the detection single transmit, and according to testing result the protection that inverter circuit puts rules into practice is moved.
In the concrete example of the lighting apparatus for discharge lamp of this prior art, can receive hardly the discharge lamp load that environment temperature causes electrical property change influence and the discharge lamp load do not launched particularly that the single transmit phenomenon detects.
Patent documentation 1: No. 3941360 communique of TOHKEMY
But, in the lighting apparatus for discharge lamp of patent documentation 1 disclosed this prior art, have following problem.
In patent documentation 1 disclosed lighting apparatus for discharge lamp, an end of discharge lamp load must directly be connected with the circuit ground of inverter circuit.
Yet; In the two ends of discharge lamp load any all not with the direct-connected lighting apparatus for discharge lamp of the circuit ground of inverter circuit in; For example in lighting apparatus for discharge lamp shown in Figure 10, be difficult to detect the non-symmetric component (direct voltage composition) that is produced in the discharge lamp load.
Particularly; Use at inverter circuit shown in Figure 10 under the situation of non-symmetric component test section of patent documentation 1; Because the direct voltage composition of the detected discharge lamp load of non-symmetric component test section and flip-flop by overlapping with the direct voltage of capacitor (C0), therefore can't obtain the performance identical with this concrete example.This be because switching device (Q1 and Q2) with situation about switching such as 50% duty ratio under, flip-flop by the voltage that uses capacitor be offer inverter circuit DC power supply voltage 1/2, usually, it is the voltage of the degree of 100～300V.The direct voltage composition that produces when discharge lamp loads on single transmit is generally the voltage of the degree of 10～40V because the state of not launching is also revocable.
Can know referring to Figure 11; Under the situation that when these two voltages overlap, it is transformed to direct voltage and it is detected through electric resistance partial pressure; Can't detect the influence of the direct voltage composition of discharge lamp load fully, thus exist can't be to the discharge lamp load do not launch the problem that single transmit phenomenon is particularly carried out high-precision test.
Summary of the invention
In order to solve above-mentioned prior art problems the present invention has been proposed.Therefore; The purpose of this invention is to provide a kind of lighting apparatus for discharge lamp and the lighting apparatus that comprises this lighting apparatus for discharge lamp; Poor between the direct voltage at the place, two ends through detecting the discharge lamp load detects the protection of not launching single transmit phenomenon particularly and inverter circuit being stipulated of discharge lamp load.
To achieve these goals,, proposed a kind of lighting apparatus for discharge lamp, having comprised according to the present invention: inverter circuit, being used for dc voltage conversion is alternating voltage, thereby to provide high-frequency ac power to make discharge tube lighting to the discharge lamp load; Two direct voltage testing circuits, the two ends with the discharge lamp load are connected respectively, are used for detecting respectively the direct voltage at the place, two ends of discharge lamp load; Be formed on the direct voltage difference detecting circuit between said two direct voltage testing circuits, be used to detect by said two direct voltage testing circuits poor between the detected direct voltage respectively; And the control circuit portion that is connected with the direct voltage difference detecting circuit, the difference between the detected said direct voltage of direct voltage difference detecting circuit is when setting is above, and the action that stops inverter circuit perhaps suppressing the output of inverter circuit.
Preferably, lighting apparatus for discharge lamp of the present invention also comprises: the DC transfer circuit that is connected with inverter circuit, carry out rectification and it be transformed to direct voltage the alternating voltage of AC power.
Preferably, lighting apparatus for discharge lamp of the present invention also comprises: filter circuit is used to stop the noise and the high-frequency current composition that are derived from inverter circuit to turn back to AC power; Rectifier is used for the alternating voltage of AC power is carried out rectification; And smoothing circuit, be used for the voltage behind the rectifier rectification is carried out smoothly to produce direct voltage.
Preferably, said discharge lamp load is the hot cathode discharge lamp load that is made up of filament.
Preferably, said discharge lamp load directly is not connected with the circuit ground of inverter circuit, and between discharge lamp load and circuit ground, has formed direct voltage composition and the overlapping formation of another direct voltage that makes discharge lamp.
Preferably, said discharge lamp load comprise be connected in series more than one discharge lamp.
Preferably, said discharge lamp load and preheating energising is connected in parallel to constitute connecting and composing of C preheating type with capacitor.
In addition, according to the present invention, a kind of lighting apparatus that comprises aforesaid lighting apparatus for discharge lamp of the present invention has been proposed also.
According to aforesaid the present invention; (for example the direct voltage composition that makes the discharge lamp load and another direct voltage between the circuit ground of discharge lamp load and inverter circuit, have been formed; Flip-flop is by with the voltage of capacitor) under the overlapping situation; Can utilize simple formation to detect the direct voltage composition that only in discharge lamp, is produced exactly, and the discharge lamp load do not launch single transmit particularly the time protection action that inverter circuit is put rules into practice.
Description of drawings
Below in conjunction with the detailed description of preferred embodiment of accompanying drawing to being adopted, above-mentioned purpose of the present invention, advantage and characteristic will become obviously through reference, wherein:
Fig. 1 shows the summary pie graph according to the lighting apparatus for discharge lamp of the first embodiment of the present invention;
Fig. 2 shows the concrete pie graph of lighting apparatus for discharge lamp shown in Figure 1;
Fig. 3 shows the summary pie graph of lighting apparatus for discharge lamp according to a second embodiment of the present invention;
Fig. 4 shows the concrete pie graph of lighting apparatus for discharge lamp shown in Figure 3;
Fig. 5 shows the summary pie graph of the lighting apparatus for discharge lamp of a third embodiment in accordance with the invention;
Fig. 6 shows the pie graph according to the discharge lamp load in the lighting apparatus for discharge lamp of first to the 3rd embodiment;
Fig. 7 shows the sketch map that comprises according to the outward appearance of the lighting device of lighting apparatus for discharge lamp of the present invention;
Fig. 8 shows the summary pie graph according to the lighting apparatus for discharge lamp of prior art;
Fig. 9 shows the concrete pie graph of lighting apparatus for discharge lamp shown in Figure 8;
Figure 10 shows the concrete pie graph of the lighting apparatus for discharge lamp of having used non-symmetric component test section shown in Figure 9, and wherein any in the two ends of discharge lamp load all directly is not connected with the circuit ground of inverter circuit; And
Figure 11 is the comparison diagram of voltage difference accuracy of detection that is used for voltage difference accuracy of detection and the lighting apparatus for discharge lamp shown in Figure 10 of key diagram 8 and lighting apparatus for discharge lamp shown in Figure 9.
Embodiment
Below with reference to accompanying drawing specific embodiment of the present invention is described.
First embodiment
Fig. 1 shows the summary pie graph according to the lighting apparatus for discharge lamp of the first embodiment of the present invention.
As shown in Figure 1, comprise according to the lighting apparatus for discharge lamp of the first embodiment of the present invention: DC (direct current) translation circuit 101, inverter circuit 103, two direct voltage testing circuit a, b, direct voltage difference detecting circuit 105 and control circuit portions 107.
The alternating voltage of 101 couples of AC power Vin of DC translation circuit carries out rectification and it is transformed to direct voltage.Inverter circuit 103 will be an alternating voltage from the dc voltage conversion of the output of DC translation circuit 101, thereby to provide high-frequency ac power to make discharge tube lighting to the discharge lamp load.Two direct voltage testing circuit a, b are connected with the two ends of discharge lamp load respectively, are used for detecting respectively the direct voltage at the place, two ends of discharge lamp load.Direct voltage difference detecting circuit 105 is formed between said two direct voltage testing circuit a, the b, is used to detect poor between the detected direct voltage respectively by said two direct voltage testing circuit a, b.Control circuit portion 107 is connected with direct voltage difference detecting circuit 105.Difference between direct voltage difference detecting circuit 105 detected direct voltages is when setting is above, and the action that this control circuit portion 107 stops inverter circuit 103 perhaps suppresses the output of inverter circuit 103.
This inverter circuit 103 is made up of by electricity consumption container C 0 the switching device Q1 that alternately repeats conducting and end, Q2, stabilizing choke BC, resonance electricity consumption container C 1, discharge lamp load FL and direct current.Inverter circuit 103 shown in Figure 1 is inverter circuits 103 of so-called semi-bridge type.
Next the action performed according to the lighting apparatus for discharge lamp of this embodiment will be described.
This inverter circuit 103 is according to the drive signal from control circuit portion 107, makes switching device Q1, Q2 alternately carry out conducting and by action.In the present embodiment, switching device Q1, Q2 switch to be roughly 50% duty ratio.
At this moment, in the circuit that constitutes by electricity consumption container C 0 by stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel and direct current, produce the square-wave voltage as peak value with the output voltage V dc of DC translation circuit 101.
This square-wave voltage ends flip-flop through direct current by electricity consumption container C 0; And apply about 1/2 the direct voltage of the output voltage V dc of DC translation circuit 101 to direct current by electricity consumption container C 0, and apply the rectangular-wave alternating-current voltage of 1/2 peak value with output voltage V dc of equaling DC translation circuit 101 to the resonant load circuit that constitutes by stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel.
Because this rectangular-wave alternating-current voltage; This resonant load circuit that is made up of stabilizing choke BC, discharge lamp load FL resonant electricity consumption container C 1 carries out the resonance action, and provides and the corresponding high-frequency ac power of the operating frequency of switching device Q1 or Q2 to discharge lamp load FL.
Two direct voltage testing circuit a, b are connected with the two ends of discharge lamp load FL respectively, when lighting usually, have applied the direct voltage composition that on electricity consumption container C 0, is applied at direct current to each of two direct voltage testing circuit a, b respectively.Because the duty ratio that switching device Q1, Q2 switch is roughly 50%, in discharge lamp load FL, can not produce the direct voltage composition.
Direct voltage difference detecting circuit 105 is connected with two direct voltage testing circuit a, b respectively, and detects poor between the detected direct voltage respectively, and export the signal of regulation according to testing result by said two direct voltage testing circuit a, b.When lighting usually, can between two direct voltage testing circuit a, b, produce dc voltage difference hardly.At this moment, judge the normal specified signal of load from direct voltage difference detecting circuit 105 to 107 inputs of control circuit portion.Therefore, control circuit portion 107 makes inverter circuit 103 continue action usually.
Get at discharge lamp load FL under the situation of end of lifetime (not launching), discharge lamp load FL shows asymmetric electric discharge phenomena.For example, this possibly be insufficient the causing of scattered quantum owing to coated emitter in the filament portion that discharge lamp load FL has taken place.
For example; Become under the situation of not launching as direct current high potential direction with the filament that is connected side of discharge lamp load FL at stabilizing choke BC; In order to eliminate the direct voltage composition that is produced among the discharge lamp load FL, end 1/2 overlapping (with reference to the waveform in Fig. 1) that on opposite direction, makes the output voltage V dc of this direct voltage composition and DC translation circuit 101 in the electricity consumption container C 0 at direct current.Although this moment, direct voltage testing circuit a detected voltage did not change, be the 1/2 overlapping and voltage of formation that makes the output voltage V dc of the direct voltage composition that produced among the discharge lamp load FL and DC translation circuit 101 at the detected voltage of direct voltage testing circuit b.Therefore; Be formed on direct voltage difference detecting circuit 105 and can detect the direct voltage composition that is produced among the discharge lamp load FL, and judge the specified signal of load abnormals (discharge lamp load do not launch particularly single transmit) to control circuit portion 107 input from direct voltage difference detecting circuit 105.
Control circuit portion 107 when receiving this specified signal, transfer to the action that stops inverter circuit 103 (for example vibration), or with protection patterns such as the output that compares inverter circuit 103 usually suppresses.
In addition; Taken place in the opposite direction under the situation of asymmetric electric discharge phenomena; Although because the polarity of the direct voltage composition that is produced among the discharge lamp load FL becomes on the contrary; But direct voltage difference detecting circuit 105 can detect poor between the direct voltage at two ends places of this discharge lamp load FL equally, and inverter circuit 103 is carried out corresponding protection.
According to the first embodiment of the present invention,
The inverter circuit that in the two ends of discharge lamp load any directly is not connected with the circuit ground of inverter circuit and when lighting usually, applied direct voltage to the two ends of load when circuit ground is observed constitutes; Owing to can only directly detect the direct voltage composition that (when not launching) produced when end of lifetime in discharge lamp load FL; Thereby can not receive the influence of environment temperature environment and asymmetric polarity of discharge and detect discharge lamp load FL exactly do not launch particularly single transmit, and can protect inverter circuit.
Fig. 2 shows the concrete pie graph of lighting apparatus for discharge lamp shown in Figure 1.
As shown in Figure 2, according to the lighting apparatus for discharge lamp of the first embodiment of the present invention, direct voltage testing circuit a is made up of resistor R a1, Ra2 and capacitor Ca1, and direct voltage testing circuit b is made up of resistor R b1, Rb2 and capacitor Cb1.Direct voltage difference detecting circuit 105 is made up of resistor R c1, transistor Qa, Qb, capacitor Cc1 and resistor R c2.This direct voltage difference detecting circuit 105 is connected with the comparator of control circuit portion 107.
Next the action that two direct voltage testing circuit a in this lighting apparatus for discharge lamp, b and direct voltage difference detecting circuit 105 are performed will be described.
Direct voltage testing circuit a, b are respectively through resistor R a1, Ra2 and resistor R b1, Rb2; The voltage that the two ends of discharge lamp load are located carries out the resistor dividing potential drop; And through capacitor Ca1, Cb1 the high-frequency ac composition is carried out filtering respectively, detect the direct voltage at the place, two ends of discharge lamp load.Just, the direct voltage of the two ends of discharge lamp load being located carries out electric resistance partial pressure and detects.
Analyzed as above, and when lighting usually,, in the direct voltage difference detecting circuit, can not produce voltage difference because direct voltage testing circuit a, b detected voltage VCa1 are identical with VCb1.
Just, the resistor R c1 place that is connected between capacitor Ca1, the Cb1 does not produce voltage difference, thereby transistor Qa, not conducting of Qb.Can not produce voltage at resistor R c2 or capacitor Cc1 place.
At this moment, to control circuit portion 107 input low level signals, and control circuit portion 107 makes inverter circuit 103 continue action usually from direct voltage difference detecting circuit 105.
As above illustrational, become under end of lifetime (not launch'sing) the situation at discharge lamp load FL, voltage VCa1 does not change, and according to the asymmetric polarity of discharge that in discharge lamp load FL, is produced, voltage VCb1 changes.
When producing voltage difference between voltage VCa1 and the voltage VCb1, for example, under the situation of VCb1＞VCa1, electric current flows to base stage and the emitter of resistor R c1 and transistor Qb in the direction from voltage VCb1 to voltage VCa1, and transistor Qb becomes conducting.At this moment; When capacitor Cc1 being charged and its voltage VCc1 when surpassing the reference voltage V ref of comparator; Comparator output low level signal, and the control circuit of control circuit portion 107 is transferred to and is made inverter circuit 103 failures of oscillations, or the protection pattern that suppresses with the output that compares inverter circuit 103 usually.Under the situation of VCb1＜VCa1, according to above identical operating principle, transistor Qa conducting is charged to move to identical protection pattern to capacitor Cc1.
According to the concrete formation of this lighting apparatus for discharge lamp, can constitute the protection when carrying out the discharge lamp load and not launching (particularly single transmit) through simple and cheap circuit.
Second embodiment
Fig. 3 shows the summary pie graph of lighting apparatus for discharge lamp according to a second embodiment of the present invention.
As shown in Figure 3, lighting apparatus for discharge lamp according to a second embodiment of the present invention comprises two direct voltage testing circuit, direct voltage difference detecting circuit and the control circuit portions identical with first embodiment.In addition, according to a second embodiment of the present invention lighting apparatus for discharge lamp also comprises: filter circuit 201, inverter circuit 203, rectifier 209 and smoothing circuit 211.
Next the action performed according to the lighting apparatus for discharge lamp of this embodiment will be described.
Because the action according to the direct voltage testing circuit of this second embodiment and direct voltage difference detecting circuit is identical with first embodiment, thereby in this its explanation of omission.
The lighting apparatus for discharge lamp of this second embodiment partly dual-purpose DC translation circuit and inverter circuit, and the action through inverter circuit, when improving power factor and input current distortion, FL provides high-frequency ac power to the discharge lamp load.
The valley fill type smoothing circuit carries out smoothly the voltage that the alternating voltage with AC power Vin carries out after the full-wave rectification through smmothing capacitor C3, C4, produces the direct voltage of part after level and smooth.
When switching device Q1 conducting, according to the size of supply voltage Vin, current path changes.Resonance current is ended the path flow of electricity consumption container C 0 through switching device Q1, stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, direct current by smoothing circuit.In addition, the path flow of the parallel circuits that constitutes through diode D1, D2, switching device Q1, stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, the circuit that forms by electricity consumption container C 0 and diode D3 that is connected in series and capacitor C3 by direct current by supply voltage of resonance current.In addition, electric current is by the path flow of capacitor C2 through diode D2, switching device Q1, stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel.In addition, electric current is ended the path flow of electricity consumption container C 0 through diode D1, D2, switching device Q1, stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, direct current by supply voltage.The size interlock of the voltage of this path and AC power Vin; At the voltage of AC power Vin near peak value; Q1 is in conduction period; The current ratio of the current path that smoothing circuit is charged from the voltage of AC power Vin becomes big; At the voltage of AC power Vin when peak value begins step-down; In Q1 conduction period, the current path through capacitor C2, diode D2, switching device Q1, stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel with become big through supply voltage, diode D1, D2, switching device Q1, stabilizing choke BC, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, direct current by the current ratio of the current path of electricity consumption container C 0.
When Q1 ended, the regenerated energy of being stored among the stabilizing choke BC was through discharge lamp load FL resonant electricity consumption container C 1, diode D3, capacitor C3, the path of switching device Q2 and the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel that is connected in parallel, the path flow that direct current ends electricity consumption container C 0, switching device Q2.
When the Q2 conducting, according to the size of the voltage of AC power Vin, current path changes.Electric current is by the path flow of direct current by the discharge lamp load FL resonant electricity consumption container C 1 of electricity consumption container C 0 through being connected in parallel, stabilizing choke BC, switching device Q2.In addition, resonance current is by the voltage of the AC power Vin path flow through diode D1, D2, capacitor C4, diode D5, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, stabilizing choke BC, switching device Q2.In addition, electric current is by the voltage of the AC power Vin path flow through diode D1, capacitor C2, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, stabilizing choke BC, switching device Q2.Same as described above; The size interlock of the voltage of this path and AC power Vin; At the voltage of AC power Vin near peak value; Q2 is in conduction period; It is big that the current ratio in the path through diode D1, D2, capacitor C4, diode D5, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, stabilizing choke BC, switching device Q2 becomes; When peak value begins step-down,, become big by the current ratio of the current path of electricity consumption container C 0, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, stabilizing choke BC, switching device Q2 and the current path of voltage through AC power Vin, diode D1, capacitor C2, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel, stabilizing choke BC, switching device Q2 at the voltage of AC power Vin through direct current in Q2 conduction period.
Q2 by the time, the regenerated energy of being stored among the stabilizing choke BC is through the path flow of switching device Q1, capacitor C4, diode D5, the discharge lamp load FL resonant electricity consumption container C 1 that is connected in parallel.
Through repeating above action; When discharge lamp load FL provides high-frequency ac power; Make the high-frequency current that is in proportion with the voltage of AC power Vin flow to inverter circuit from power supply; And, can side by side improve input power factor and input current distortion through this electric current being carried out filtering by filter circuit.
In such inverter circuit constitutes; Switching device Q1, Q2 with the situation that roughly 50% duty ratio is moved under; When lighting usually; Between two direct voltage testing circuits, can not produce dc voltage difference; And getting into end of lifetime and when not launching at discharge lamp load FL, the direct voltage difference detecting circuit will detect by two direct voltage testing circuits distinguishes poor between detected two voltages, and control circuit portion carries out the protection to inverter circuit identical with first embodiment according to testing result and moves.
Owing to have identical direct voltage testing circuit and direct voltage difference detecting circuit, lighting apparatus for discharge lamp according to a second embodiment of the present invention can be realized the technique effect identical with first embodiment, specifically as stated.
Fig. 4 shows the concrete pie graph of lighting apparatus for discharge lamp shown in Figure 3.
In order to simplify, only concrete formations different with first embodiment in the lighting apparatus for discharge lamp shown in Figure 4 is described below explanation of the present invention.
As shown in Figure 4, in this lighting apparatus for discharge lamp, the switching device of inverter circuit is made up of bipolar transistor Q1, Q2 and free-wheel diode D7, D8.
Transistor Q1, Q2 adopt the autoexcitation driving method.According to the voltage that is produced among the current transformer CT, base current is provided to transistor Q1, Q2.
Control circuit portion is made up of Zener diode ZD1, capacitor R13, capacitor C7, thyristor SCR, the resistor R 11, diode D12, resistor R 12 and the capacitor C6 that are connected with the secondary coiling of stabilizing choke BC, diode D11, direct voltage source E, diode D13 and the resistor R 14 that is connected with the base stage of transistor Q2.
Next the action performed according to the lighting apparatus for discharge lamp of this embodiment will be described.
Because the front is illustrated the action of inverter circuit and direct voltage testing circuit, direct voltage difference detecting circuit, therefore in this its explanation of omission.Below the action of control circuit portion will only be described.
In the common action of inverter circuit, because stored charge not, the voltage VCc1 of capacitor Cc1 is in below the Zener voltage of Zener diode ZD1.Just, because not to the grid input trigger voltage of thyristor SCR, thyristor SCR ends.In addition, at this moment, resistor R 11, the R12 that is connected in parallel and the capacitor C6 that is connected with the secondary coiling of stabilizing choke BC, diode D12 charge to capacitor C6 with the voltage of stipulating when carrying out halfwave rectifier.
Become at discharge lamp load FL and not launch and when asymmetric electric discharge phenomena take place; Identical with the description of front; When capacitor Cc1 being charged and its voltage VCc1 when surpassing the Zener voltage of Zener diode ZD1, begin capacitor C7 is charged, thyristor SCR becomes conducting.When thyristor SCR conducting, institute's stored voltage begins discharge through the path of thyristor SCR, diode D10, D11 among the capacitor C6.Because this electric current, extract the base current of transistor Q2, the inverter circuit failure of oscillations out through the path of D11, capacitor C6, thyristor SCR.In addition; Thyristor SCR is because grid triggers after the conducting; Since the holding current of thyristor SCR through direct voltage source E, diode D13, resistor R 14, thyristor SCR path flow and provide, can keep the stopping of vibration of inverter circuit.
The 3rd embodiment
Fig. 5 shows the summary pie graph of the lighting apparatus for discharge lamp of a third embodiment in accordance with the invention.
The lighting apparatus for discharge lamp of a third embodiment in accordance with the invention is that the half-bridge formation of inverter circuit shown in Figure 2 is out of shape the example that forms afterwards.As shown in Figure 5, the half-bridge formation of this inverter circuit 503 constitutes different with the half-bridge of the inverter circuit 103 of first embodiment.However, the main composition of the lighting apparatus for discharge lamp of the 3rd embodiment shown in Figure 5 is identical with first embodiment in fact with operating principle, therefore omits it at this and specifies.
Thus, a third embodiment in accordance with the invention can obtain the technique effect identical with first embodiment.
Fig. 6 shows the pie graph according to the discharge lamp load in the lighting apparatus for discharge lamp of the foregoing description.
As shown in Figure 6, the number that constitutes the discharge lamp of the discharge lamp load in the lighting apparatus for discharge lamp is not limited to one, and can be more than one.And as shown in Figure 6, under the situation that the discharge lamp load is made up of a plurality of discharge lamps, a plurality of discharge lamps are connected in series.A plurality of discharge lamps that are connected in series and preheating electricity consumption container C 1 are connected in parallel, and have constituted connecting and composing of C preheating type.In addition, this discharge lamp load can be the hot cathode discharge lamp load that is made up of filament.
Fig. 7 shows the sketch map that comprises according to the outward appearance of the lighting device of lighting apparatus for discharge lamp of the present invention.
As shown in Figure 7, can lighting apparatus for discharge lamp according to the present invention be loaded on the various lighting devices, and can obtain the technique effect identical with above-described the present invention.
Although below combined the preferred embodiments of the present invention to show the present invention, one skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited the foregoing description, and should be limited accompanying claims and equivalent thereof.
The referenced drawings symbol
The INV inverter circuit
The C0 capacitor
The Z load circuit
1 tube voltage test section
2 non-symmetric component test sections
3 " or " portion
Claims (8)
1. lighting apparatus for discharge lamp comprises:
Inverter circuit, being used for dc voltage conversion is alternating voltage, thereby to provide high-frequency ac power to make discharge tube lighting to the discharge lamp load;
Two direct voltage testing circuits, the two ends with the discharge lamp load are connected respectively, are used for detecting respectively the direct voltage at the place, two ends of discharge lamp load;
Be formed on the direct voltage difference detecting circuit between said two direct voltage testing circuits, be used to detect by said two direct voltage testing circuits poor between the detected direct voltage respectively; And
The control circuit portion that is connected with the direct voltage difference detecting circuit, the difference between the detected said direct voltage of direct voltage difference detecting circuit is when setting is above, and the action that stops inverter circuit perhaps suppressing the output of inverter circuit.
2. lighting apparatus for discharge lamp according to claim 1 also comprises:
The DC transfer circuit that is connected with inverter circuit carries out rectification and it is transformed to direct voltage the alternating voltage of AC power.
3. lighting apparatus for discharge lamp according to claim 1 also comprises:
Filter circuit is used to stop the noise and the high-frequency current composition that are derived from inverter circuit to turn back to AC power;
Rectifier is used for the alternating voltage of AC power is carried out rectification; And
Smoothing circuit is used for the voltage behind the rectifier rectification is carried out smoothly to produce direct voltage.
4. lighting apparatus for discharge lamp according to claim 1, wherein said discharge lamp load are the hot cathode discharge lamp loads that is made up of filament.
5. lighting apparatus for discharge lamp according to claim 1; Wherein said discharge lamp load directly is not connected with the circuit ground of inverter circuit, and between discharge lamp load and circuit ground, has formed direct voltage composition and the overlapping formation of another direct voltage that makes discharge lamp.
6. lighting apparatus for discharge lamp according to claim 1, wherein said discharge lamp load comprise be connected in series more than one discharge lamp.
7. lighting apparatus for discharge lamp according to claim 1, wherein said discharge lamp load and preheating energising are connected in parallel to constitute connecting and composing of C preheating type with capacitor.
8. one kind comprises the lighting apparatus according to any described lighting apparatus for discharge lamp of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110043058.0A CN102647840B (en) | 2011-02-21 | 2011-02-21 | Electric-discharge lamp lightening device and illumination device comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110043058.0A CN102647840B (en) | 2011-02-21 | 2011-02-21 | Electric-discharge lamp lightening device and illumination device comprising same |
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| Publication Number | Publication Date |
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| CN102647840A true CN102647840A (en) | 2012-08-22 |
| CN102647840B CN102647840B (en) | 2015-01-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002083698A (en) * | 2000-09-06 | 2002-03-22 | Matsushita Electric Works Ltd | Electric discharge lamp lighting equipment |
| CN1585586A (en) * | 2003-08-21 | 2005-02-23 | 株式会社电装 | Lighting device of discharge lamp |
| CN1780518A (en) * | 2004-09-22 | 2006-05-31 | 三星电子株式会社 | Circuit and method for driving discharge lamp |
| US20100072913A1 (en) * | 2008-09-24 | 2010-03-25 | Panasonic Electric Works Co., Ltd. | High pressure discharge lamp lighting device and luminaire using same |
| CN101690409A (en) * | 2007-06-20 | 2010-03-31 | 松下电工株式会社 | Discharge lamp operating device, illumination device, and liquid crystal display device |
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2011
- 2011-02-21 CN CN201110043058.0A patent/CN102647840B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002083698A (en) * | 2000-09-06 | 2002-03-22 | Matsushita Electric Works Ltd | Electric discharge lamp lighting equipment |
| CN1585586A (en) * | 2003-08-21 | 2005-02-23 | 株式会社电装 | Lighting device of discharge lamp |
| CN1780518A (en) * | 2004-09-22 | 2006-05-31 | 三星电子株式会社 | Circuit and method for driving discharge lamp |
| CN101690409A (en) * | 2007-06-20 | 2010-03-31 | 松下电工株式会社 | Discharge lamp operating device, illumination device, and liquid crystal display device |
| US20100072913A1 (en) * | 2008-09-24 | 2010-03-25 | Panasonic Electric Works Co., Ltd. | High pressure discharge lamp lighting device and luminaire using same |
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| CN102647840B (en) | 2015-01-28 |
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