CN100480716C - Detector - Google Patents
Detector Download PDFInfo
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- CN100480716C CN100480716C CN 200510121018 CN200510121018A CN100480716C CN 100480716 C CN100480716 C CN 100480716C CN 200510121018 CN200510121018 CN 200510121018 CN 200510121018 A CN200510121018 A CN 200510121018A CN 100480716 C CN100480716 C CN 100480716C
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- inverter circuit
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Abstract
The detection device includes an input end, a power supply circuit, an inverter circuit unit, a voltage regulation unit, an output unit, and a detection unit. The input end is in use for inputting AC. The power supply circuit is in use for stepping down voltage, and rectifying AC to DC. The inverter circuit unit is in use for inverting DC to AC, and for stepping up voltage. The voltage regulation unit is in use for adjusting the input voltage for the inverter circuit unit; and the output end is in use for outputting the stepped up AC. The detection unit includes a first voltage detection unit, and a second voltage detection unit. The first voltage detection unit is in use for measuring the input voltage of the inverter circuit unit, and the second voltage detection unit is in use for measuring the output voltage of the inverter circuit unit. It is convenient for the detection device to carry out detecting.
Description
[technical field]
The present invention relates to a kind of pick-up unit, particularly a kind of cold cathode ray tube pick-up unit.
[background technology]
Along with the develop rapidly of science and technology, LCD becomes the main flow in the demonstration field gradually, but this also also has higher requirement to the reliability of LCD.And cold cathode ray tube (Cold Cathode Fluorescent Lamp, CCFL) be generally the critical elements of LCD, particularly the some modulating voltage of cold cathode ray tube is bigger to the reliability effect of LCD, seems very necessary so cold cathode ray tube is carried out the reliability detection.
See also Fig. 1, be the detection synoptic diagram of a kind of cold cathode ray tube detection system of prior art.This detection system 100 comprises direct voltage source 120, inverter circuit unit 130 and oscillograph 150.This direct voltage source 120 is connected to the input end of this inverter circuit unit 130, and this oscillograph 150 is connected to the output terminal of this inverter circuit unit 130, these direct voltage source 120 tool output voltages, electric current Presentation Function.
When using this detection system 100, cold cathode ray tube 180 is connected to the output terminal of this inverter circuit unit 130, open this direct voltage source 120 and oscillograph 150, regulate the output voltage of this direct voltage source 120 from low to high and light this cold cathode ray tube 180.In the process that this cold cathode ray tube 180 is lighted, one maximum output voltage can appear in the output terminal of this inverter circuit unit 130, this maximum output voltage is the some modulating voltage of this cold cathode ray tube 180, and this lamp voltage value and corresponding current value are shown by this oscillograph 150 or calculate.When maximum output voltage appearred in this inverter circuit unit 130, the output voltage of this direct voltage source 120 was the secondary point modulating voltage of this cold cathode ray tube 180, and this secondary point lamp voltage value and corresponding current value are shown by this direct voltage source 120.
Yet, when this detection system 100 detects, this direct voltage source 120, oscillograph 150 and cold cathode ray tube 180 all need be connected to this inverter circuit unit 130, feasible connection is more loaded down with trivial details, and this connection is all temporary transient connection, connect unstablely, make the less stable that detects, so inconvenient when causing this detection system 100 to detect.
[summary of the invention]
Inconvenient problem when detecting in order to solve detection system in the prior art is necessary to provide a kind of more convenient pick-up unit that detects.
A kind of pick-up unit, it comprises: an input end, a power circuit, an inverter circuit unit, a voltage-regulation unit, an output terminal and a detecting unit; This input end is used for input AC, it is direct current that this power circuit is used for alternating current step-down and rectification, this inverter circuit unit is used for dc inverter to be alternating current and to boost, this inverter circuit unit comprises an input end, this input end is used to receive input voltage, this voltage-regulation unit is used for regulating the input voltage of this inverter circuit unit, alternating current output after this output terminal is used for this is boosted, this detecting unit comprises one first voltage detection unit and one second voltage detection unit, this first voltage detection unit is used for measuring the input voltage of this inverter circuit unit, this first voltage detection unit is connected between the input end and ground wire of this inverter circuit unit, and second voltage detection unit is used for measuring the output voltage of this inverter circuit unit.
This pick-up unit is regulated the input voltage of this inverter circuit unit by this voltage-regulation unit, and detect the input voltage and the output voltage of this inverter circuit unit by this detecting unit, and with voltage-regulation unit and this inverter circuit unit and detecting unit integration, and set up lasting the connection, make the stable higher of this pick-up unit, so this detection system detects more convenient.
[description of drawings]
Fig. 1 is the detection synoptic diagram of a kind of cold cathode ray tube detection system of prior art.
Fig. 2 is the connection diagram of pick-up unit one better embodiment of the present invention.
Fig. 3 is the circuit diagram of the voltage-regulation unit of pick-up unit shown in Figure 2.
Fig. 4 is the synoptic diagram of pick-up unit shown in Figure 2.
[embodiment]
See also Fig. 2, be the synoptic diagram of pick-up unit one better embodiment of the present invention.This pick-up unit 2 comprises an input end 22, a switch 23, a power circuit 24, a voltage-regulation unit 25, an inverter circuit unit 26, a detecting unit 28 and an output terminal 29.This detecting unit 28 comprises first detecting unit 281 and second detecting unit 282.
This input end 22 is connected to the AC power of 220V or 110V via lead.This AC power offers this power circuit 24 via this input end 22 and switch 23, this power circuit 24 can export AC power step-down and the rectification of 220V or 110V to this voltage-regulation unit 25 for the 18V direct current input end 251.This voltage-regulation unit 25 can be regulated this 18V direct current, exports the input end 261 of this inverter circuit unit 26 then to via output terminal 257.The dc inverter that this inverter circuit unit 26 can provide this voltage-regulation unit 25 also boosts and is High Level AC Voltage, and via these output terminal 29 outputs.
This first detecting unit 281 is arranged between this voltage-regulation unit 25 and this inverter circuit unit 26, and it comprises one first voltage detection unit 2811 and one first current detecting unit 2812.This first voltage detection unit 2811 is a voltage table, and it is connected between the input end 261 and ground wire of this inverter circuit unit 26, is used for detecting the input voltage of this inverter circuit unit 26.This first current detecting unit 2812 is a reometer, and it is connected between the input end 261 of the output terminal 257 of this voltage-regulation unit 25 and this inverter circuit unit 26, is used for detecting the input current of this inverter circuit unit 26.
This second detecting unit 282 is arranged between this inverter circuit unit 26 and the output terminal 29, and it comprises one second voltage detection unit 2821 and one second current detecting unit 2822.Second voltage detection unit 2821 comprises two resistance 2823,2824 and a voltage table 2825.The resistance of this resistance 2823 is much larger than this resistance 2824, and the resistance of this resistance 2823 is 3M Ω, and the resistance of this resistance 2824 is 30K Ω.These two resistance 2823,2824 are connected in series between the high-pressure side 262 and low pressure end 263 of this inverter circuit unit 26, and the High Level AC Voltage that this inverter circuit unit 26 is exported carries out dividing potential drop, this voltage table 2825 is connected in parallel with this resistance 2824, and it is used for measuring the dividing potential drop of this resistance 2824.Can calculate the voltage of this High Level AC Voltage according to the resistance of the dividing potential drop of this resistance 2824 and these two resistance 2823,2824.And by setting the resistance of these two resistance 2823,2824, make the integral multiple of the voltage of this High Level AC Voltage for these resistance 2824 dividing potential drops, the voltage of this High Level AC Voltage then is the integral multiple of these voltage table 2825 readings, conveniently to read the magnitude of voltage of this High Level AC Voltage.
This second current detecting unit 2822 is a reometer, and it is arranged between the low pressure end 263 and this output terminal 29 of this inverter circuit unit 26, is used for detecting the output current of this inverter circuit unit 26.
See also Fig. 3, be the circuit diagram of the voltage-regulation unit 25 of this pick-up unit 2.This voltage-regulation unit 25 comprises an input end 251, an input filter unit 252, a regulon 253, an output filter unit 254, a feedback unit 255, a control module 256 and an output terminal 257.
Filter unit 254 filtering are regulated, exported to the direct current of these input end 251 inputs via these input filter unit 252 filtering, regulon 253, export this output terminal 257 to, this feedback unit 255 can and feed back to this control module 256 to the sampling of the output voltage of this output terminal 257, this control module 256 can be controlled this regulon 253 according to feedback voltage, to regulate the output voltage of this output terminal 257.
This input filter unit 252 comprises two electric capacity 2521,2522, all is connected to be used for filtering between this input end 251 and the ground wire.
This control module 256 comprises an integrated circuit 2561, two resistance 2562,2563 and electric capacity 2564.8 pins of these integrated circuit 2561 tools, the pin 6 of this integrated circuit 2561 is a power input, it is connected to this input end 251, for this integrated circuit 2561 provides power supply; The pin 2 and 4 of this integrated circuit 2561 is connected to ground wire; The pin 3 of this integrated circuit 2561 is connected to ground wire by this electric capacity 2564, and this electric capacity 2564 is oscillating capacitance, and the oscillation frequency that its vibration back produces will offer this integrated circuit 2561.The input end of this resistance 2562 is connected to this input end 251, and its output terminal is connected to the pin 7 of this regulon 253 and this integrated circuit 2561.One end of this resistance 2563 is connected to this pin 7, and the other end is connected to this pin 1 and 8.
This regulon 253 comprises a transistor 2531, a diode 2532 and an inductance 2533.The source electrode of this transistor 2531 is connected to the output terminal of this resistance 2562, the grid of this transistor 2531 is connected to the pin 1 and 8 of this integrated circuit 2561, the drain electrode of this transistor 2531 is connected to ground wire via this diode 2532, and is connected to this output terminal 257 via this inductance 2533.
This output filter unit 254 comprises two electric capacity 2541,2542, all is connected to be used for filtering between this output terminal 257 and the ground wire.
This feedback unit 255 comprises two adjustable resistances 2551,2552 and an electric capacity 2553.These two adjustable resistances 2551,2552 are connected in series between this output terminal 257 and the ground wire, and this electric capacity 2553 is connected in parallel with this resistance 2551.
The pin 7 of this integrated circuit 2561 is the induction by current end, it is connected to the junction of source electrode and this resistance 2562 of this transistor 2531, when the input current of this transistor 2531 increases, the pressure drop of this resistance 2562 increases, and the voltage of the pin 7 of this integrated circuit 2561 reduces the input current of then representing this transistor 2531 and increases; This integrated circuit 2561 can to reduce the input current of this transistor 2531, reach the function of overcurrent protection by reducing the switching frequency of its pin 1 and 8, and vice versa.The pin 5 of this integrated circuit 2561 is the input end of feedback voltage, it is connected to the tie point of these two adjustable resistances 2551,2552, then the voltage of this adjustable resistance 2552 is feedback voltage, this integrated circuit 2561 will be according to the feedback voltage of pin 5, control the switching frequency of this transistor 2531 by pin 1 and 8, to regulate the output voltage of this output terminal 257.When this transistor 2531 is opened, electric current will export this output terminal 257 to via this inductance 2533, and at this moment, this inductance 2533 is with storage power; When this transistor 2531 is closed, these inductance 2533 energy stored will continue output voltage to this output terminal 257 via these diode 2532 afterflows; When the switching frequency step-down of this transistor 2531, the output voltage of this output terminal 257 is with step-down, and vice versa.Therefore, by regulating the resistance of these two adjustable resistances 2551,2552, can control the output voltage of this output terminal 257.The resistance of this adjustable resistance 2551 is much larger than this adjustable resistance 2552, so, by this adjustable resistance 2551 can this output terminal 257 of coarse adjustment output voltage, and, can accurately control the output voltage of this output terminal 257 by these two adjustable resistances 2551,2552 by the output voltage that this adjustable resistance 2552 can this output terminal 257 of fine tuning.
The capacitance of these two electric capacity 2521,2522 is respectively 0.1 μ F and 470 μ F.This transistor 2531 is a metal-oxide semiconductor (MOS) (Metal OxideSemiconductor, MOS) transistor.The model of this diode 2532 is SKS-20-04.The inductance value of this inductance 2533 is 100 μ H.The model of this integrated circuit 2561 is GM34063.The resistance of this resistance 2562 is 0.1 Ω.The resistance of this resistance 2563 is 270 Ω.The capacitance of this electric capacity is 1nF.The resistance of this adjustable resistance 2551 is 200K Ω.The resistance of this adjustable resistance 2552 is 2K Ω.The capacitance of this electric capacity 2553 is 10nF.The capacitance of these two electric capacity 2541,2542 is respectively 0.1 μ F and 470 μ F.
See also Fig. 4, this pick-up unit 2 further comprises a shell 30, and each element of this pick-up unit 2 can be accommodated and protect to this shell 30, makes that the stability of this pick-up unit 2 and security are higher.And this input end 22, switch 23, two adjustable resistances 2551 and 2552, first voltage detection unit 2811, first current detecting unit 2812, second voltage detection unit 2821, second current detecting unit 2822 and output terminals 29 all are arranged on this case surface, make connect when detecting, to regulate and read the detection data more convenient.
When using this pick-up unit 2 to detect, cold cathode ray tube is connected to the output terminal 29 of this pick-up unit 2, open this switch 23, the direct current of these power circuit 24 outputs is supplied with this inverter circuit unit 26 via this voltage-regulation unit 25, this inverter circuit unit 26 is with dc inverter and boost and be High Level AC Voltage, via this output terminal 29 High Level AC Voltage is supplied with cold cathode ray tube again.Regulate this two adjustable resistances 2551,2552, make the input voltage of this inverter circuit unit 26 raise, the output voltage of this inverter circuit unit 26 also raises, and lights this cold cathode ray tube.
In the process that this cold cathode ray tube is lighted, one maximum output voltage can appear in this second voltage detection unit 2821, this maximum output voltage is the some modulating voltage of this cold cathode ray tube, and this lamp voltage value and corresponding current value can be shown by this second voltage detection unit 2821 and second current detecting unit 2822.When maximum output voltage appears in this second voltage detection unit 2821, the input voltage of this inverter circuit unit 26 is the secondary point modulating voltage of this cold cathode ray tube, and this secondary point lamp voltage value and corresponding current value can be shown by this first voltage detection unit 2811 and first current detecting unit 2812.
This pick-up unit 2 is regulated the input voltage of this inverter circuit unit 26 by this voltage-regulation unit 25, and detect input voltage and electric current and the output voltage and the electric current of this inverter circuit unit 26 by this detecting unit 28, and voltage-regulation unit 25 and this inverter circuit unit 26 and detecting unit 28 are integrated, and set up lasting the connection, make the stable higher of this pick-up unit 2, and be connected with cold cathode ray tube with AC power with output terminal 29 by input end 22, and then it is simple and stable higher to make that this detection system 2 connects, so this detection system 2 detects more convenient.
This second current detecting unit 2822 can also be arranged between the high-pressure side 262 and this output terminal 29 of this inverter circuit unit 26.
The voltage table 2825 of this second voltage detection unit 2821 and first voltage detection unit 2811 can be the voltage instrument, these two current detecting units 2812,2822 can be current instrument, and this voltage and current value can be read by the dial plate of this voltage instrument and current instrument; It can also be digital voltmeter and digital electronic ammeter, and this voltage and current value can be read by the display screen of this digital voltmeter and digital electronic ammeter.This second voltage detection unit 2821 can also only be a voltage table.
Claims (13)
1. pick-up unit, it comprises:
One input end, it is used for input AC;
One power circuit, it is used for alternating current step-down and rectification is direct current;
One inverter circuit unit, it is alternating current with dc inverter and boosts that this inverter circuit unit comprises an input end, this input end is used to receive input voltage;
One voltage-regulation unit, it is used for regulating the input voltage of this inverter circuit unit; And
One output terminal, the alternating current output after it is used for this is boosted;
It is characterized in that: this pick-up unit further comprises a detecting unit, it comprises first voltage detection unit and second voltage detection unit, this first voltage detection unit is used for measuring the input voltage of this inverter circuit unit, this first voltage detection unit is connected between the input end and ground wire of this inverter circuit unit, and second voltage detection unit is used for measuring the output voltage of this inverter circuit unit.
2. pick-up unit as claimed in claim 1, it is characterized in that: this detecting unit further comprises one first current detecting unit and one second current detecting unit, these two current detecting units are all reometer, this first current detecting unit is used for measuring the input current of this inverter circuit unit, and second current detecting unit is used for measuring the output current of this inverter circuit unit.
3. pick-up unit as claimed in claim 2 is characterized in that: this first current detecting unit is connected between the input end of this voltage-regulation unit and this inverter circuit unit.
4. pick-up unit as claimed in claim 2 is characterized in that: this inverter circuit unit further comprises a low pressure end, and this second current detecting unit is arranged between the low pressure end and this output terminal of this inverter circuit unit.
5. pick-up unit as claimed in claim 2 is characterized in that: this inverter circuit unit further comprises a high-pressure side, and this second current detecting unit is arranged between the high-pressure side and this output terminal of this inverter circuit unit.
6. pick-up unit as claimed in claim 1, it is characterized in that: this voltage-regulation unit comprises an input end, an input filter unit, a regulon, an output filter unit, a feedback unit, a control module and an output terminal, this input end is used for input voltage, this input filter unit and output filter unit are used for filtering, this regulon is used for regulating this input voltage and exports output terminal to, this feedback unit is used for providing feedback for this control module, this control module is used for controlling this regulon, and this output terminal is used for output voltage.
7. pick-up unit as claimed in claim 6 is characterized in that: this input filter unit and output filter unit all comprise two electric capacity, and the capacitance of these two electric capacity does not wait.
8. pick-up unit as claimed in claim 6, it is characterized in that: this feedback unit comprises one first adjustable resistance and one second adjustable resistance, the resistance of this first adjustable resistance is greater than this second adjustable resistance, this first adjustable resistance is coarse adjustment, this second adjustable resistance is fine tuning, and the Voltage Feedback of this second adjustable resistance is to this control module.
9. pick-up unit as claimed in claim 8 is characterized in that: the resistance of this first adjustable resistance is 200K Ω, and the resistance of this second adjustable resistance is 2K Ω.
10. pick-up unit as claimed in claim 9 is characterized in that: this first adjustable resistance is an electric capacity in parallel further.
11. pick-up unit as claimed in claim 6 is characterized in that: this control module comprises an integrated circuit and an electric capacity, and the model of this integrated circuit is GM34063, and this electric capacity provides oscillation frequency for this integrated circuit.
12. pick-up unit as claimed in claim 1 is characterized in that: this second voltage detection unit comprises two resistance and a voltage table, this two resistance series connection, and the resistance value of a resistance is greater than another, and the less resistance of this voltage table and resistance value is in parallel.
13. pick-up unit as claimed in claim 1 is characterized in that: this pick-up unit further comprises a shell, and this shell is used for accommodating the element of this pick-up unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510121018 CN100480716C (en) | 2005-12-20 | 2005-12-20 | Detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510121018 CN100480716C (en) | 2005-12-20 | 2005-12-20 | Detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1987502A CN1987502A (en) | 2007-06-27 |
| CN100480716C true CN100480716C (en) | 2009-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510121018 Expired - Fee Related CN100480716C (en) | 2005-12-20 | 2005-12-20 | Detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100480716C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102529459A (en) * | 2011-12-22 | 2012-07-04 | 深圳中航信息科技产业股份有限公司 | Printing head detection device and printer thereof |
-
2005
- 2005-12-20 CN CN 200510121018 patent/CN100480716C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 脉宽调制亮度调节方式下冷阴极荧光灯性能的实验研究. 王元庆.发光学报，第25卷第4期. 2004 |
| 脉宽调制亮度调节方式下冷阴极荧光灯性能的实验研究. 王元庆.发光学报，第25卷第4期. 2004 * |
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| Publication number | Publication date |
|---|---|
| CN1987502A (en) | 2007-06-27 |
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Granted publication date: 20090422 Termination date: 20161220 |