CN101175358B - Full-bridge protection circuit and multi-light tube driving circuit using the same - Google Patents
Full-bridge protection circuit and multi-light tube driving circuit using the same Download PDFInfo
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- CN101175358B CN101175358B CN2006101425521A CN200610142552A CN101175358B CN 101175358 B CN101175358 B CN 101175358B CN 2006101425521 A CN2006101425521 A CN 2006101425521A CN 200610142552 A CN200610142552 A CN 200610142552A CN 101175358 B CN101175358 B CN 101175358B
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Abstract
The present invention provides a full bridge protection circuit, which is used for multi lamp tube driving circuit. The full bridge protection circuit mainly comprises a main control unit, a full bridge conversion unit and a detecting circuit. The main control unit is provided with an input end and an output end. The output end of the main control unit is used for outputting control signal. The input end of the full bridge conversion unit is coupled and connected with the output end of the main control unit to receive the control signal. The detecting circuit is coupled and connected with the input end of the full bridge conversion unit and the input end of the main control unit. When the detecting circuit detects that the control signal received by the input end of the full bridge conversion unit is abnormal, the electric potential of the input end of the main control unit is changed by the detecting circuit, so the main control unit is stopped to output the control signal.
Description
Technical field
The present invention relates to a kind of technical field of multiple lamp tube drive circuit, and be particularly related to a kind of full-bridge protection circuit and use its multiple lamp tube drive circuit.
Background technology
Please with reference to Fig. 1, it shows the sketch map of traditional multiple lamp tube drive circuit.As shown in Figure 1, multiple lamp tube drive circuit 100 is in order to driving a plurality of fluorescent tube L, fluorescent tube L for example be cathode fluorescent tube (ColdCathode Fluorescent Lamp, CCFL).Multiple lamp tube drive circuit 100 comprises main control unit 110, the first full-bridge converting unit 120a, first transformer 130, the second full-bridge converting unit 120b, second transformer 140 and two feedback circuits 150 and 160.
In addition, the multiple lamp tube drive circuit 100 of Fig. 1 is that example is explained with general two driving converter structures.That is; It is last that main control unit 110, the first full-bridge converting unit 120a, first transformer 130 and feedback circuit 150 are arranged on a main circuit board (master board) M, and that the second full-bridge converting unit 120b, second transformer 140 and feedback circuit 160 are arranged on another secondary circuit board (slaver board) S is last.
For example (Pulse Width Modulation, PWM) controller is in order to produce control signal S1-S4 for pulse-width modulation for main control unit 110.Under normal operating state, the control signal S1-S4 of main control unit 110 is sent to main circuit board M and secondary circuit board S respectively and goes up a plurality of full-bridge converting units via transfer wire and buffer etc.As shown in Figure 1, control signal S1-S4 is except being sent to the first full-bridge converting unit 120a, and by connector and winding displacement and be sent to the second full-bridge converting unit 120b on the secondary circuit board S from main circuit board M.Two full-bridge converting unit 120a and 120b respectively have four transistor switch assemblies (not illustrating); Open repeatedly and close in order to receive corresponding control signal S1-S4; Produce the AC driving signal by this, and after transformer 130 and 140 boosted, the fluorescent tube L that input is coupled was luminous to drive it. Feedback circuit 150 and 160 uses some diodes and resistance to come the detector tube electric current, and produces feedback signal to main control unit 110.
Yet, in a large amount of processes of making, often produce assembly error because of job relations causes two winding displacements between circuit board.At this moment, control signal S1-S4 just can't normally be sent to each full-bridge converting unit; Like four transistors of the last second full-bridge converting unit 120b of secondary circuit board S maybe a certain just be to receive to be the fixing normal control signal S1-S4 of square wave, but the situation that the generation signals sky connects or signal is fixed a height (low) level.Thus, the full-bridge converting unit possibly transshipped or other factors is arranged and caused transistor or fuse to burn, and the control signal S1-S4 that is sent to other group full-bridge converting unit is also taken place unusually.At this moment, other full-bridge converting unit will be ensued unusual or damage.
The problems referred to above not only make product quality be greatly affected, and also cause follow-up maintenance or inspection operation to be difficult for carrying out because can't learn really that real generation belongs to unusually, and to start in the manufacture process because of problem points solve.
Summary of the invention
In view of this, the object of the invention is exactly a kind of full-bridge protection circuit to be provided and to use its multiple lamp tube drive circuit.Mainly be to utilize testing circuit in the full-bridge protection circuit to detect the control signal that corresponding full-bridge converting unit received or whether the drive signal that is produced be unusual, and and then make the main control unit shut-down operation.By this, can, one group of full-bridge converting unit protect other group full-bridge converting unit can not ensue unusual or damage when damaging.
According to the object of the invention, a kind of multiple lamp tube drive circuit is proposed, in order to drive a plurality of fluorescent tubes.Multiple lamp tube drive circuit comprises main control unit, the first full-bridge converting unit, first transformer, the second full-bridge converting unit, second transformer and testing circuit.Main control unit has input and output, and the output of main control unit is in order to the output control signal.The input of the first full-bridge converting unit couples the output of main control unit, to receive control signal.The primary side of first transformer couples the output of the first full-bridge converting unit, and the secondary side of first transformer couples an end of these a little fluorescent tubes fluorescent tube wherein.The input of the second full-bridge converting unit couples the output of main control unit, to receive control signal.The primary side of second transformer couples the output of the second full-bridge converting unit, and the secondary side of second transformer couples the other end of this fluorescent tube.The input that testing circuit couples the input of the first or second full-bridge converting unit and couples main control unit.When testing circuit detects the control signal that input received of the first or second full-bridge converting unit when unusual, testing circuit changes the current potential of the input of main control unit, makes main control unit stop to export control signal according to this.
According to the object of the invention, a kind of full-bridge protection circuit is proposed.Full-bridge protection circuit is applicable to a multiple lamp tube drive circuit, and comprises main control unit, full-bridge converting unit and testing circuit.Main control unit has input and output, and the output of main control unit is in order to the output control signal.The input of full-bridge converting unit couples the output of main control unit, to receive control signal.Testing circuit couples the input of full-bridge converting unit and the input of main control unit.When testing circuit detects the control signal that input received of full-bridge converting unit when unusual, testing circuit changes the current potential of the input of main control unit, makes main control unit stop to export control signal according to this.
According to the object of the invention, a kind of full-bridge protection circuit is proposed.Full-bridge protection circuit is applicable to a multiple lamp tube drive circuit, and comprises main control unit, full-bridge converting unit and testing circuit.Main control unit has an input.The full-bridge converting unit couples main control unit, and comprises the first transistor, transistor seconds, the 3rd transistor and the 4th transistor, and first and second transistor series, the 3rd and the 4th transistor series.Main control unit is controlled first to fourth transistor and is produced a drive signal.Testing circuit couples the input of drive signal and main control unit, and when testing circuit detects drive signal when unusual, testing circuit changes the current potential of the input of main control unit, makes main control unit stop to control first to fourth transistor according to this and produces drive signal.
According to the object of the invention, a kind of multiple lamp tube drive circuit is proposed, in order to drive a plurality of fluorescent tubes.Multiple lamp tube drive circuit comprises main control unit, full-bridge converting unit, transformer and testing circuit.Main control unit has an input.The full-bridge converting unit couples main control unit, and comprises the first transistor, transistor seconds, the 3rd transistor and the 4th transistor, and first and second transistor series, the 3rd and the 4th transistor series.Main control unit is controlled first to fourth transistor and is produced a drive signal.The primary side of transformer couples the full-bridge converting unit to receive drive signal, and the secondary side of transformer couples these a little fluorescent tubes fluorescent tube wherein.Testing circuit couples the input of drive signal and main control unit, and when testing circuit detects drive signal when unusual, testing circuit changes the current potential of the input of main control unit, makes main control unit stop to control first to fourth transistor according to this and produces drive signal.
According to the object of the invention, a kind of multiple lamp tube drive circuit is proposed, in order to drive a plurality of fluorescent tubes.Multiple lamp tube drive circuit comprises main control unit, full-bridge converting unit, transformer and testing circuit.Main control unit has input and output, and the output of main control unit is in order to the output control signal.The input of full-bridge converting unit couples the output of main control unit, to receive control signal.The primary side of transformer couples the output of full-bridge converting unit, and the secondary side of transformer couples an end of these a little fluorescent tubes fluorescent tube wherein.Testing circuit couples the input of full-bridge converting unit and the input of main control unit.When testing circuit detects the control signal that input received of full-bridge converting unit when unusual, testing circuit changes the current potential of the input of main control unit, makes main control unit stop to export control signal according to this.
For letting above-mentioned purpose of the present invention, characteristic and the advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and conjunction with figs., elaborates as follows.
Description of drawings
Fig. 1 shows the sketch map of traditional multiple lamp tube drive circuit.
Fig. 2 shows the sketch map according to the multiple lamp tube drive circuit of first embodiment of the invention.
Fig. 3 shows the circuit diagram of the testing circuit 250 of Fig. 2.
Fig. 4 shows the sketch map according to the full-bridge protection circuit of second embodiment of the invention.
Fig. 5 shows the circuit diagram of the testing circuit 450 of Fig. 4.
The reference numeral explanation
100,200: multiple lamp tube drive circuit
110,210,410: main control unit
120a, 220a: the first full-bridge converting unit
120b, 220b: the second full-bridge converting unit
130,230: the first transformers
140,240: the second transformers
150,160: feedback circuit
250,450: testing circuit
400: full-bridge protection circuit
420: the full-bridge converting unit
R1-R3, r1, r2: resistance
C1, C2, c1, c2: electric capacity
Q1-Q3, q2, q4:NMOS transistor
Q1, q3:PMOS transistor
D, d1-d3: diode
L: fluorescent tube
M: main circuit board
S: secondary circuit board
Embodiment
First embodiment
Please with reference to Fig. 2, it shows the sketch map according to the multiple lamp tube drive circuit of first embodiment of the invention.Multiple lamp tube drive circuit 200 is in order to driving a plurality of fluorescent tube L, and comprises main control unit 210, the first full-bridge converting unit 220a, first transformer 230, the second full-bridge converting unit 220b, second transformer 240 and testing circuit 250.Wherein, multiple lamp tube drive circuit 200 is an example with two converter structures that drive equally, and promptly two full- bridge converting unit 220a and 220b are arranged at respectively on two circuit boards (not illustrating).Wherein, testing circuit 250 is to be example with the second full-bridge converting unit 220b that couples on the secondary circuit board, comes to make comparisons and explain how to bring into play the protection effect with existing.In addition, existing feedback circuit also omits its icon.
In addition, the primary side of first transformer 230 (p) couples the output 222a of the first full-bridge converting unit 220a, and the secondary side of first transformer (s) couples the end of a fluorescent tube L.The primary side of second transformer 240 (p) couples the output 222b of the second full-bridge converting unit 220b, and the secondary side of second transformer 240 (s) couples the other end of this fluorescent tube L.
The function of testing circuit 250 mainly is that the control signal S that received in order to the input 221b that detects the second full-bridge converting unit 220b is when unusual (due to existing winding displacement error); Change the current potential of the input 211 of main control unit 210; Make main control unit 210 inner stop to export control signal S like pwm chip according to the potential change of input 211; Thereby guarantee that other assembly can not receive control on Abnormal signal S like the first full-bridge converting unit 220a in the multiple lamp tube drive circuit 200 if the second full-bridge converting unit 220b damages.Under now accompanying drawing specify the circuit structure and the function mode of testing circuit 250.
Please with reference to Fig. 3, it shows the circuit diagram of the testing circuit 250 of Fig. 2.Detecting unit 250 comprises charge/discharge unit 251 and switch element 252.As shown in Figure 3, charge/discharge unit 251 comprises diode D, first resistance R 1, first capacitor C 1, second capacitor C 2, second resistance R 2, nmos pass transistor Q1.First resistance R 1 and first capacitor C 1 are parallel between the negative electrode of an earth terminal GND and diode D.Second capacitor C 2 is coupled between first end of anode and second resistance R 2 of diode D.Second end of second resistance R 2 couples an operating voltage Vcc.The grid of nmos pass transistor Q1 is in order to couple the input 221b of the second full-bridge converting unit 220b among Fig. 2.The source electrode of nmos pass transistor Q1 and drain electrode couple first end of the earth terminal GND and second resistance R 2 respectively.
252 of switch elements comprise nmos pass transistor Q2, nmos pass transistor Q3 and the 3rd resistance R 3.The grid of nmos pass transistor Q2 and source electrode couple negative electrode and the earth terminal GND of diode D respectively.The grid of nmos pass transistor Q3 and source electrode couple drain electrode and the earth terminal GND of nmos pass transistor Q2 respectively.The drain electrode of nmos pass transistor Q3 is the input 211 in order to couple main control unit 210 among Fig. 2 then.The 3rd resistance R 3 is coupled between the grid of operating voltage Vcc and nmos pass transistor Q3.
When the control signal S that is received as the input 221b of the second full-bridge converting unit 220b was normal square wave, nmos pass transistor Q1 is corresponding according to this to open and closes, make electric current via second resistance R 2, second capacitor C 2 and diode D to 1 charging of first capacitor C.That is the cathode potential of diode D can be increased to a fixed level.At this moment, nmos pass transistor Q2 and Q3 open respectively and close, and a high level is kept in the drain electrode of nmos pass transistor Q3 then.
Yet; When the control signal S that is received as the input 221b of the second full-bridge converting unit 220b is unusual; Connect or fixing high (low) level like the signal sky, promptly nmos pass transistor Q1 can not open and close repeatedly, just second capacitor C 2 can produce short circuit or isolation effect to the direct current signal of fixed level.At this moment, first capacitor C 1 will be by 1 discharge of first resistance R, and nmos pass transistor Q2 closes because of the cathode potential reduction of diode D, and nmos pass transistor Q3 then opens according to operating voltage Vcc and makes its drain electrode change to a low level.
In brief, charge/discharge unit 251 is can be according to the control signal S that input 221b is received normal or carry out charge or discharge unusually, and 252 of switch elements produce the input 211 of high level signal or low level signal to main control unit 210 accordingly.By this, detecting unit 250 utilizes the running of charge/discharge unit 251 and switch element 252 and can bring into play above-mentioned defencive function.
Wherein, preferably come configuration detection circuit 250, to detect each input 221b respectively with the quantity of the input 221b of the corresponding second full-bridge converting unit 220b.Certainly, the first full-bridge converting unit 220a equally can applying detection circuit 250.In addition; Though first embodiment explains with the structure of two driving converters; But look the actual design of multiple lamp tube drive circuit; Testing circuit 250 can be a full-bridge protection circuit with main control unit 210 and the collocation of arbitrary full-bridge converting unit also, supplies required the operating in of designer for example to adopt single multiple lamp tube drive circuit that drives converter structure.
Second embodiment
Please with reference to Fig. 4, it shows the sketch map according to the full-bridge protection circuit of second embodiment of the invention.Be that with the first embodiment difference testing circuit 450 of full-bridge protection circuit 400 changes to couple the drive signal Sd that full-bridge converting unit 420 produces, and is whether unusual to detect it.
As shown in Figure 4, full-bridge converting unit 420 comprises four transistors; PMOS transistor q1 and nmos pass transistor q2 to be in series in a second embodiment, with PMOS transistor q3 that is in series and nmos pass transistor q4 be example.The control signal S1-S4 of main control unit 410 exports the grid of four transistor q1-q4 respectively to, opens and closes and between two series connection point T1 and T2, produce and will boost and be conducted to the AC driving signal Sd of fluorescent tube via transformer to control four transistor q1-q4 alternate repetitions.Yet in case arbitrary control signal S1-S4 is unusual, drive signal Sd ensues equally unusually.
Please with reference to Fig. 5, it shows the circuit diagram of the testing circuit 450 of Fig. 4.Compared to Fig. 3, because the signal level that is detected is different, the circuit structure of detecting unit 450 its charge/discharge units 451 and switch element 452 is also different.In a second embodiment.Charge/discharge unit 451 comprises the first diode d1, the first resistance r1, the first electric capacity c1, the second electric capacity c2, the second resistance r2 and the second diode d2.The first resistance r1 and the first electric capacity c1 are parallel between the negative electrode of the earth terminal GND and the first diode d1.The second electric capacity c2 is coupled between first end of anode and the second resistance r2 of the first diode d1.Second end of the second resistance r2 couples the series connection point T1 of Fig. 4, to receive drive signal Sd.In other embodiments, second end of the second resistance r2 also can couple series connection point T2.The negative electrode of the second diode d2 and anode then couple anode and the earth terminal GND of the first diode d1 respectively.452 of switch elements comprise the 3rd diode d3, and the negative electrode of the 3rd diode d3 and anode couple the negative electrode of the first diode d1 and the input 411 of main control unit 410 respectively.
When full-bridge converting unit 420 produced normal AC driving signal Sd, electric current charged to the first electric capacity c1 via the second resistance r2, the second electric capacity c2 and first and second diode d1 and d2.That is the cathode potential of the first diode d1 can be increased to a fixed level, and is higher than the anode potential of the 3rd diode d3 and makes the 3rd not conducting of diode d3.
Yet, when drive signal Sd is unusual, connect or fixing high (low) level, just the second electric capacity c2 can produce short circuit or isolation effect to the direct current signal of fixed level like the signal sky.At this moment, the first electric capacity c1 will be discharged by the first resistance r1, and cause the cathode potential of the 3rd diode d3 to reduce and conducting.By this, the anode potential of the 3rd diode d3 after the conducting will and then reduce.
Thus; Charge/discharge unit 451 can carry out charge or discharge according to the normal or unusual drive signal Sd that is received; 452 current potentials that can change the input 411 of main control unit 410 accordingly of switch element, and make main control unit 410 shut-down operation according to this with first embodiment is said.Have common knowledge the knowledgeable when understanding in the technical field under right the present invention, two kinds of testing circuits among above-mentioned two embodiment can couple outside the full-bridge converting unit simultaneously, and the existing feedback circuit of also all arranging in pairs or groups uses.For example, the input of main control unit promptly can be the pin of the feedback signal that generally is provided with receiving feedback circuit, and testing circuit then makes main control unit shut-down operation according to this by changing the feedback signal level, reaches required defencive function.
The full-bridge protection circuit that the above embodiment of the present invention disclosed and use its multiple lamp tube drive circuit.Mainly be to utilize testing circuit in the full-bridge protection circuit to detect the control signal that corresponding full-bridge converting unit received or whether the drive signal that is produced be unusual, and and then make the main control unit shut-down operation.By this, can, one group of full-bridge converting unit protect other group full-bridge converting unit can not ensue unusual or damage when damaging.
In sum, though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Have common knowledge the knowledgeable in the technical field under any, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching.Therefore, protection scope of the present invention is as the criterion when looking appended the claim person of defining.
Claims (25)
1. multiple lamp tube drive circuit, in order to drive a plurality of fluorescent tubes, this multiple lamp tube drive circuit comprises:
One main control unit has an input and an output, and this output of this main control unit is in order to export a control signal;
One first full-bridge converting unit, an input of this first full-bridge converting unit couples this output of this main control unit, to receive this control signal;
One first transformer, the primary side of this first transformer couple an output of this first full-bridge converting unit, and the secondary side of this first transformer couples an end of a lamp tubes fluorescent tube wherein;
One second full-bridge converting unit, an input of this second full-bridge converting unit couples this output of this main control unit, to receive this control signal;
One second transformer, the primary side of this second transformer couple an output of this second full-bridge converting unit, and the secondary side of this second transformer couples the other end of this fluorescent tube; And
One testing circuit; This input that couples this input of this first or second full-bridge converting unit and couple this main control unit; When this testing circuit detects this control signal that this input received of this first or second full-bridge converting unit when unusual; This testing circuit changes the current potential of this input of this main control unit, makes this main control unit stop to export this control signal according to this.
2. multiple lamp tube drive circuit as claimed in claim 1; Wherein, This control signal that this input received that detects this second full-bridge converting unit when this testing circuit just often; Produce this input of a high level signal to this main control unit,, then produce this input of a low level signal to this main control unit when this testing circuit detects this control signal that this input received of this second full-bridge converting unit when unusual.
3. multiple lamp tube drive circuit as claimed in claim 2, wherein, this testing circuit comprises:
One charge/discharge unit, this input that couples this first or second full-bridge converting unit to be receiving this control signal, when this control signal just often, this charge/discharge unit charges according to this control signal; And
One switch element couples this input of this charge/discharge unit and this main control unit, and when this control signal was unusual, this charge/discharge unit discharged, and makes this switch element produce this low level signal.
4. multiple lamp tube drive circuit as claimed in claim 3, wherein, this charge/discharge unit comprises:
One diode;
One first resistance and one first electric capacity are parallel between the negative electrode of an earth terminal and this diode;
One second electric capacity and one second resistance, this second electric capacity are coupled between one first end of an anode and this second resistance of this diode, and one second end of this second resistance couples an operating voltage; And
One transistor, this transistorized grid couples this input of this first or second full-bridge converting unit, and this a transistorized one source pole and a drain electrode couple this first end of this earth terminal and this second resistance respectively.
5. multiple lamp tube drive circuit as claimed in claim 4, wherein, this switch element comprises:
One the first transistor, a grid of this first transistor and one source pole couple this anode and an earth terminal of this diode respectively;
One transistor seconds, a grid of this transistor seconds and one source pole couple drain electrode and this earth terminal of this first transistor respectively, and a drain electrode of this transistor seconds couples this input of this main control unit; And
One resistance is coupled between this grid of an operating voltage and this transistor seconds.
6. full-bridge protection circuit, this full-bridge protection circuit is applicable to a multiple lamp tube drive circuit, this full-bridge protection circuit comprises:
One main control unit has an input and an output, and this output of this main control unit is in order to export a control signal;
One full-bridge converting unit, an input of this full-bridge converting unit couples this output of this main control unit, to receive this control signal; And
One testing circuit; Couple this input of this full-bridge converting unit and this input of this main control unit; When this testing circuit detects this control signal that this input received of this full-bridge converting unit when unusual; This testing circuit changes the current potential of this input of this main control unit, makes this main control unit stop to export this control signal according to this.
7. full-bridge protection circuit as claimed in claim 6; Wherein, This control signal that this input received that detects this full-bridge converting unit when this testing circuit just often; Produce this input of a high level signal to this main control unit,, then produce this input of a low level signal to this main control unit when this testing circuit detects the control signal that this input received of this full-bridge converting unit when unusual.
8. full-bridge protection circuit as claimed in claim 7, wherein, this testing circuit comprises:
One charge/discharge unit, this input that couples this full-bridge converting unit to be receiving this control signal, when this control signal just often, this charge/discharge unit charges according to this control signal; And
One switch element couples this input of this charge/discharge unit and this main control unit, and when this control signal was unusual, this charge/discharge unit discharged, and makes this switch element produce this low level signal.
9. full-bridge protection circuit as claimed in claim 8, wherein, this charge/discharge unit comprises:
One diode;
One first resistance and one first electric capacity are parallel between the negative electrode of an earth terminal and this diode;
One second electric capacity and one second resistance, this second electric capacity are coupled between one first end of an anode and this second resistance of this diode, and one second end of this second resistance couples an operating voltage; And
One transistor, this transistorized grid couples this input of this full-bridge converting unit, and this a transistorized one source pole and a drain electrode couple this first end of this earth terminal and this second resistance respectively.
10. full-bridge protection circuit as claimed in claim 9, wherein, this switch element comprises:
One the first transistor, a grid of this first transistor and one source pole couple this negative electrode and an earth terminal of this diode respectively;
One transistor seconds, a grid of this transistor seconds and one source pole couple drain electrode and this earth terminal of this first transistor respectively, and a drain electrode of this transistor seconds couples this input of this main control unit; And
One resistance is coupled between this grid of an operating voltage and this transistor seconds.
11. a full-bridge protection circuit, this full-bridge protection circuit is applicable to a multiple lamp tube drive circuit, and this full-bridge protection circuit comprises:
One main control unit has an input;
One full-bridge converting unit; Couple this main control unit; And comprise a first transistor, a transistor seconds, one the 3rd transistor and one the 4th transistor; This first and second transistor series, the 3rd and the 4th transistor series, this this first to fourth transistor of main control unit control produces a drive signal; And
One testing circuit; Couple this input of this drive signal and this main control unit; When this testing circuit detects this drive signal when unusual; This testing circuit changes the current potential of this input of this main control unit, makes this main control unit stop to control this first to fourth transistor according to this and produces this drive signal.
12. full-bridge protection circuit as claimed in claim 11; Wherein, When this testing circuit detects this drive signal just often; Produce this input of a high level signal to this main control unit,, then produce this input of a low level signal to this main control unit when this testing circuit detects this drive signal when unusual.
13. full-bridge protection circuit as claimed in claim 12, wherein, this testing circuit comprises:
One charge/discharge unit couples this first and second transistorized series connection and sentences and receive this drive signal, when this drive signal just often, this charge/discharge unit charges according to this drive signal; And
One switch element couples this input of this charge/discharge unit and this main control unit, and when this drive signal was unusual, this charge/discharge unit discharged, and makes this switch element produce this low level signal.
14. full-bridge protection circuit as claimed in claim 13, wherein, this charge/discharge unit more comprises:
One first diode;
One first resistance and one first electric capacity are parallel between the negative electrode of an earth terminal and this first diode;
One second electric capacity and one second resistance, this second electric capacity are coupled between one first end of an anode and this second resistance of this first diode, and one second end of this second resistance couples this first and second transistorized series connection place; And
One second diode, a negative electrode of this second diode and an anode couple this anode and this earth terminal of this first diode respectively.
15. full-bridge protection circuit as claimed in claim 14, wherein, this switch element more comprises:
One diode, a negative electrode of this diode couples this negative electrode of this first diode, and an anode of this diode couples this input of this main control unit.
16. a multiple lamp tube drive circuit, in order to drive a plurality of fluorescent tubes, this multiple lamp tube drive circuit comprises:
One main control unit has an input;
One full-bridge converting unit; Couple this main control unit; And comprise a first transistor, a transistor seconds, one the 3rd transistor and one the 4th transistor; This first and second transistor series, the 3rd and the 4th transistor series, this this first to fourth transistor of main control unit control produces a drive signal; And
One transformer, the primary side of this transformer couple this full-bridge converting unit to receive this drive signal, and the secondary side of this transformer couples a lamp tubes fluorescent tube wherein; And
One testing circuit; Couple this input of this drive signal and this main control unit; When this testing circuit detects this drive signal when unusual; This testing circuit changes the current potential of this input of this main control unit, makes this main control unit stop to control this first to fourth transistor according to this and produces this drive signal.
17. multiple lamp tube drive circuit as claimed in claim 16; Wherein, When this testing circuit detects this drive signal just often; Produce this input of a high level signal to this main control unit,, then produce this input of a low level signal to this main control unit when this testing circuit detects this drive signal when unusual.
18. multiple lamp tube drive circuit as claimed in claim 17, wherein, this testing circuit comprises:
One charge/discharge unit couples this first and second transistorized series connection and sentences and receive this drive signal, when this drive signal just often, this charge/discharge unit charges according to this drive signal; And
One switch element couples this input of this charge/discharge unit and this main control unit, and when this drive signal was unusual, this charge/discharge unit discharged, and makes this switch element produce this low level signal.
19. multiple lamp tube drive circuit as claimed in claim 18, wherein, this charge/discharge unit more comprises:
One first diode;
One first resistance and one first electric capacity are parallel between the negative electrode of an earth terminal and this first diode;
One second electric capacity and one second resistance, this second electric capacity are coupled between one first end of an anode and this second resistance of this first diode, and one second end of this second resistance couples this first and second transistorized series connection place; And
One second diode, a negative electrode of this second diode and an anode couple this anode and this earth terminal of this first diode respectively.
20. multiple lamp tube drive circuit as claimed in claim 19, wherein, this switch element more comprises:
One diode, a negative electrode of this diode couples this negative electrode of this first diode, and an anode of this diode couples this input of this main control unit.
21. a multiple lamp tube drive circuit, in order to drive a plurality of fluorescent tubes, this multiple lamp tube drive circuit comprises:
One main control unit has an input and an output, and this output of this main control unit is in order to export a control signal;
One full-bridge converting unit, an input of this full-bridge converting unit couples this output of this main control unit, to receive this control signal;
One transformer, the primary side of this transformer couple an output of this full-bridge converting unit, and the secondary side of this transformer couples an end of a lamp tubes fluorescent tube wherein; And
One testing circuit; Couple this input of this full-bridge converting unit and this input of this main control unit; When this testing circuit detects this control signal that this input received of this full-bridge converting unit when unusual; This testing circuit changes the current potential of this input of this main control unit, makes this main control unit stop to export this control signal according to this.
22. multiple lamp tube drive circuit as claimed in claim 21; Wherein, This control signal that this input received that detects this full-bridge converting unit when this testing circuit just often; Produce this input of a high level signal to this main control unit,, then produce this input of a low level signal to this main control unit when this testing circuit detects the control signal that this input received of this full-bridge converting unit when unusual.
23. multiple lamp tube drive circuit as claimed in claim 22, wherein, this testing circuit comprises:
One charge/discharge unit, this input that couples this full-bridge converting unit to be receiving this control signal, when this control signal just often, this charge/discharge unit charges according to this control signal; And
One switch element couples this input of this charge/discharge unit and this main control unit, and when this control signal was unusual, this charge/discharge unit discharged, and makes this switch element produce this low level signal.
24. multiple lamp tube drive circuit as claimed in claim 23, wherein, this charge/discharge unit comprises:
One diode;
One first resistance and one first electric capacity are parallel between the negative electrode of an earth terminal and this diode;
One second electric capacity and one second resistance, this second electric capacity are coupled between one first end of an anode and this second resistance of this diode, and one second end of this second resistance couples an operating voltage; And
One transistor, this transistorized grid couples this input of this full-bridge converting unit, and this a transistorized one source pole and a drain electrode couple this first end of this earth terminal and this second resistance respectively.
25. multiple lamp tube drive circuit as claimed in claim 24, wherein, this switch element comprises:
One the first transistor, a grid of this first transistor and one source pole couple this negative electrode and an earth terminal of this diode respectively;
One transistor seconds, a grid of this transistor seconds and one source pole couple drain electrode and this earth terminal of this first transistor respectively, and a drain electrode of this transistor seconds couples this input of this main control unit; And
One resistance is coupled between this grid of an operating voltage and this transistor seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101425521A CN101175358B (en) | 2006-10-30 | 2006-10-30 | Full-bridge protection circuit and multi-light tube driving circuit using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101425521A CN101175358B (en) | 2006-10-30 | 2006-10-30 | Full-bridge protection circuit and multi-light tube driving circuit using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101175358A CN101175358A (en) | 2008-05-07 |
| CN101175358B true CN101175358B (en) | 2012-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101425521A Expired - Fee Related CN101175358B (en) | 2006-10-30 | 2006-10-30 | Full-bridge protection circuit and multi-light tube driving circuit using the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101175358B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6759812B2 (en) * | 2001-08-30 | 2004-07-06 | Koito Manufacturing Co., Ltd. | Discharge lamp lighting circuit for detecting failure of a switching element |
| CN1711805A (en) * | 2002-11-11 | 2005-12-21 | 皇家飞利浦电子股份有限公司 | Circuit arrangement for operating a high pressure discharge lamp |
-
2006
- 2006-10-30 CN CN2006101425521A patent/CN101175358B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6759812B2 (en) * | 2001-08-30 | 2004-07-06 | Koito Manufacturing Co., Ltd. | Discharge lamp lighting circuit for detecting failure of a switching element |
| CN1711805A (en) * | 2002-11-11 | 2005-12-21 | 皇家飞利浦电子股份有限公司 | Circuit arrangement for operating a high pressure discharge lamp |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2006-73441A 2006.03.16 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101175358A (en) | 2008-05-07 |
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