CN100391315C - Power supply unit and used current converter - Google Patents
Power supply unit and used current converter Download PDFInfo
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- CN100391315C CN100391315C CNB011375507A CN01137550A CN100391315C CN 100391315 C CN100391315 C CN 100391315C CN B011375507 A CNB011375507 A CN B011375507A CN 01137550 A CN01137550 A CN 01137550A CN 100391315 C CN100391315 C CN 100391315C
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Abstract
The present invention provides a power supply device which combines a rectifier/filter and a converter circuit with a current inverter so as to reduce size and improve power supply efficiency. The power supply device comprises a rectifier/filter, a DC-DC converter and a DC-AC inverter, wherein the rectifier/filter is connected to an AC input end so as to convert AC electricity to DC electricity. The DC-DC converter and the DC-AC inverter supply the power concurrently, and their one end is connected to the output end of the rectifier/filter simultaneously. The DC-DC converter converts the input DC voltage to a fixed low DC voltage output so as to supply a system circuit with electricity power. The DC-AC inverter converts the input DC voltage to a higher AC voltage output so as to supply a lamp tube with electricity power.
Description
Technical field
The present invention is relevant for a kind of power system, particularly relevant a kind of structure with multistage input voltage, its with rectification/filter and transducer (converter) circuit in conjunction with converter (inverter), so that reduce volume and improve power-efficient.
Background technology
The indoor power supply system is based on alternating current now, and it is in the scope of 90-264V (interchange) mostly, for example, is typically 90-132V (interchange) or 180-264V (interchange).Yet, in the present LCD, except that the general circuit power supply in giving display of the DC power supply of needs one low voltage,, also need the AC power of a high voltage that the discharge lamp power supply of illumination is provided to power supply as the circuit of control chart image signal etc.For example, in the mobile computer liquid crystal panel of single fluorescent tube, need be approximately the power supply of 7-21V (direct current), and in many fluorescent tubes LCD, needs 12 or 15V different fixed voltages such as (direct currents) are to power to display circuit; Simultaneously, also need one to be approximately more than 1,000 volt AC power, to drive a cathode fluorescent tube (CCFL) that light source is provided.Therefore, one typical electric power system, as shown in Figure 1, must comprise an input AC from socket, through one rectification/filter 11, a flyback converter (Fly-Back converter) 12, one converter (DC-ACinverter) 13 and a lowering and stabilizing blood pressure device (Buck regulator) 14, with required alternating current to lamp tube power supply, and power to other element of display system with required direct current.But, this typical electric power system needs conversion layer by layer, commercially available product all is that rectification/filter 11 and flyback converter 12 are formed an additional adapter (additional adapter) at present, needs to be connected to converter 13 and lowering and stabilizing blood pressure device 14 via connector and cable again; Therefore, make power-efficient lower, only have about 70%, and part, assembly cost height, volume also accounted in appearance.
Summary of the invention
Therefore, a purpose of the present invention provides a kind of supply unit, and it does not need an external adapter, can reach the purpose that reduces volume and improve power-efficient.This supply unit is to can be used for providing power supply to comprise the system of fluorescent tube, comprising: one rectification/filter, flow to direct current (DC-DC) transducer and always flow to exchange (DC-AC) converter always.This rectification/filter has an input, is connected to an AC power, is used for converting input ac voltage to direct voltage.This direct current is connected to the output of this rectification/filter simultaneously to the mutual parallel powering of alternating-current converter and both ends to direct current transducer and this direct current, and the required power supply of other end difference output system, wherein, this direct current is pressed into low-voltage dc voltage output to direct current transducer with the dc voltage drop of importing, to power to the circuit system except that fluorescent tube, this direct current then converts the direct voltage of input to alternating-current converter and exchanges and the output of boosting, with to lamp tube power supply.
In view of the above, supply unit of the present invention can not only can improve power-efficient directly in conjunction with rectification/filter, transducer and converter, and can select the lower part of rated power for use, and, more can reach the effect that reduces volume and reduce part and assembly cost because it can be made on the same circuit board.
Another object of the present invention provides a kind of converter, is used to drive a discharge lamp, comprising: two switches; One drive circuit (driver) is used to drive this two switches alternate conduction; One transformer; One sample circuit is used to obtain the lamp tube current value and exports a feedback signal, and a pulse-width modulation (PWM) control circuit is used for coming according to feedback signal the duty cycle of control Driver Circuit; One voltage detecting circuit is used for exporting a control signal according to the direct voltage size of input converter, and an impedance adjustment circuit, is used for adjusting its equivalent impedance according to control signal.
In view of the above, converter of the present invention can be when the voltage of its input be higher, to change the relation curve of its frequency and impedance, makes the frequency of operation of converter can not produce change significantly because of the influence that input voltage raises via the adjustment of impedance adjustment circuit.Therefore, can guarantee the useful life of fluorescent tube, and can avoid lead to produce the part problem of temperature rise that kelvin effect causes, more can effectively reduce conversion loss because of high frequency.
Description of drawings
For make above-mentioned and other purpose of the present invention, feature, can be more apparent with advantage, hereinafter enumerate a preferred embodiment, and cooperate appended accompanying drawing, be described in detail below, wherein:
Fig. 1 represents a typical electric power system calcspar;
Fig. 2 represents the calcspar of a supply unit of the present invention;
The calcspar of Fig. 3 converter in the presentation graphs 2 according to the present invention;
Two impedances-frequency relation curve that the impedance adjustment circuit that Fig. 4 is illustrated in Fig. 3 is produced when switching impedance; And
Fig. 5 is the circuit diagram of one embodiment of presentation graphs 3 according to the present invention;
Second embodiment of the impedance adjustment circuit in Fig. 6 presentation graphs 5;
The 3rd embodiment of the impedance adjustment circuit in Fig. 7 presentation graphs 5; And
The 4th embodiment of the impedance adjustment circuit in Fig. 8 presentation graphs 5.
Symbol description: 11,21: rectification/filter; 12,22: transducer; 13,23: converter; 14: the lowering and stabilizing blood pressure device; 30: control circuit for pulse-width modulation 31: top driver 32: below driver 33: switch 34: impedance adjustment circuit 36: voltage detecting circuit 37: fluorescent tube 38: sample circuit
Embodiment
Similar functions element in the following explanation uses identical numbering.
With reference to figure 2, it is the calcspar of a supply unit of the present invention.In Fig. 2, this supply unit comprises: one rectification/filter 21, flow to direct current (DC-DC) transducer 22 and flow to always and exchange (DC-AC) converter 23 always.As shown in Figure 2, one input of this rectification/filter 21 is connected to an external ac power source, (for example be used for input ac voltage, general chamber electricity is 90-132V (interchanges) or 180-264V (interchange)) convert direct voltage to and export (for example, the magnitude of voltage that M is ordered among the figure is 120-190V or 250-380V (direct current)).This direct current to direct current transducer 22 and this direct current to alternating-current converter 23, be different from three grades of electric power systems of a typical case, the parallel simultaneously output that is connected to this rectification/filter is so that shorten input ac voltage to the progression between required output voltage and improve its power-efficient and arrive about 80%.Just, the more typical electric power system of the power supplying efficiency of this structure increases about 10%.Wherein, this direct current will be imported the high-voltage dc voltage step-down to direct current transducer 22 and become fixing low-voltage dc voltage output, with part except that fluorescent tube and circuit supply in system, this direct current then converts the direct voltage of input to the more alternating current output of high pressure to alternating-current converter 23, for driving fluorescent tube.For example, the uses such as other circuit of the fixed voltage liquid crystal display of 12V (direct current) and/or 5V (direct current) are provided by this transducer 22, even can use for the personal computer system, provide about more than 1,000 volts alternating voltage to be used to drive by this converter 23 in addition to a cathode fluorescent tube.Wherein, this converter partly is described in further detail as follows.
With reference to figure 3, be the calcspar of this converter (inverter) 23 among Fig. 2.In Fig. 3, this converter 23 can be used for driving fluorescent tube 37, it comprises: switch 33 (comprising the first switch M1 and second switch M2), a top drive circuit (HSD, high side driver) 31, one below drive circuit (LSD, low side driver), 32, one transformer T3, an impedance adjustment circuit (34, one voltage detecting circuit 36, a sample circuit 38 and a pulse-width modulation (PWM) control circuit 30.
As shown in Figure 3, top drive circuit 31 and below drive circuit 32 are connected respectively to the control input end of the first switch M1 and second switch M2, are used for driving this two switch M1, M2 alternate conduction by driving frequency.Therefore, from the DC power supply (direct voltage that promptly is equivalent to node M feed-in in Fig. 2) of end points Vin input, can convert the primary side of ac square wave feed-in transformer T3 to via the change action of switch M1, M2.Then,, and export about more than 1,000 a volts AC power source of sine wave, be connected in the fluorescent tube 37 of transformer T3 secondary side with driving via boosting and filtering of transformer T3.Sample circuit 38 is connected in an end of fluorescent tube 37, be used to detect flow through fluorescent tube 37 electric current and export one and feed back signal to control circuit for pulse-width modulation 30.Control circuit for pulse-width modulation 30 can be controlled the duty cycle (duty cycle) of top drive circuit 31 and below drive circuit 32 according to feedback signal, so that regulate the brightness of fluorescent tube 37.Impedance adjustment circuit 34 is connected between the primary side and voltage detecting circuit 36 of transformer T3.Voltage detecting circuit 36 can relatively be imported the dc voltage value Vin and a predefined reference voltage level Vref of converter, and adjust the switching of circuit 34 according to control group as a result relatively, that is, change the resistance value of impedance adjustment circuit 34, to change from the viewed equivalent impedance of transformer T3 primary side.
In the circuit of above-mentioned Fig. 3, control circuit for pulse-width modulation 30 also replaceable becomes other to have the circuit of similar effect.For example, can adopt a frequency modulation(FM) control circuit, the switching frequency of drive circuit 31 and below drive circuit 32 can reach the purpose of regulating fluorescent tube 37 brightness equally above controlling with the foundation feedback signal.
With reference to figure 4, Fig. 4 adjusts the impedance-frequency relation curve chart that is produced when circuit switches impedance at Fig. 3 middle impedance.As shown in Figure 4, adopt the input power supply of 90-132V (interchange) when the present invention's supply unit shown in Figure 2, that is voltage detecting circuit 36 detects and converts to when Vin is about 120-190V (direct current) behind the direct voltage, and controllable impedance is adjusted circuit 34 and made converter 23 operations switch on impedance Z
1, at this moment, frequency of operation is in f
1～f
3Scope in (frequency f
1Corresponding to 120V (direct current) input voltage; Frequency f
3Corresponding to 190V (direct current) input voltage).Adopt the input power supply of 180-264V (interchange) when the present invention's supply unit shown in Figure 2, that is, voltage detecting circuit 36 detects and converts to when Vin is about 250-380V (direct current) behind the direct voltage, and controllable impedance is adjusted circuit 34 and made converter 23 operations switch on impedance Z
2, at this moment, frequency of operation is in f
2～f
4Scope in (frequency f
2Corresponding to 250V (direct current) input voltage; Frequency f
4Corresponding to 380V (direct current) input voltage).Therefore, generally speaking, the frequency of operation of converter of the present invention is in f
1～f
4Scope in, in fact be about the scope of 50kHz to 65kHz.Compare with it, known converter does not have the function that impedance is switched because voltage detecting circuit 36 and impedance adjustment circuit 34 are not set, thereby when supply unit adopts the input power supply of 180-264V (interchange), can make frequency of operation be in f
5～f
6Scope in (frequency f
5Corresponding to 250V (direct current) input voltage; And frequency f
6Corresponding to 380V (direct current) input voltage), obviously, will make the frequency of operation mobility scale become big.That is when input voltage was higher, the converter possible operation switched on the high frequency of 80kHz, caused collecting the skin phenomenon easily.Therefore, converter circuit provided by the present invention, when input voltage was higher, controllable impedance-frequency relation curve was from impedance Z
1Switch to impedance Z
2, make converter operate in relatively low frequency, effectively improve the generation of kelvin effect.In addition, because the scope of frequency change narrows down, but the life-span of prolonging lamp tube.Moreover the switching frequency of switch 33 descends, and reduces the temperature rise of part, and then reduces the loss and improve its efficient.The input voltage range of these 120 to 380V (direct currents) only is used for explanation, is not to be used for restriction, and every those skilled in the art can come the input voltage range of design according to the actual requirements.In addition, voltage detecting circuit 36 also can change the external ac power source that detects among Fig. 2 into via suitable modification, and exports a control signal to impedance adjustment circuit 34 according to the size of its magnitude of voltage.
Fig. 5 is the circuit diagram of the embodiment of Fig. 3 according to the present invention.In Fig. 5, this control circuit for pulse-width modulation 30 can use any known technology to realize, so only represent with calcspar.As shown in Figure 5, for improving the driving force of PWM 2 signals, in the drive circuit 31, switch Q14 and Q18 are set up, it replaces change action can produce a square wave, again via a capacitor C 56 and an isolated driving transformer T4, produces the signal of a driving switch M1.This signal is with after circuit such as switch Q13, resistance R 44, resistance R 77, resistance R 88 and capacitor C 8, but the change action of acceleration switch M1.In the drive circuit 32 of below, then comprise circuit such as switch Q19, resistance R 95, diode D3, but the change action of acceleration switch M2.This switch 33 comprises above-mentioned this first and second switch M1 and M2, be subjected to the driving of top drive circuit 31 and below drive circuit 32 respectively, so that by a frequency alternate conduction, convert the direct voltage Vin of input to primary side that square wave outputs to transformer T3, with after transformer T3 boosts and filtering becomes AC sine wave, be used to drive the fluorescent tube 37 that is connected in Circuit Fault on Secondary Transformer.A transformer T3 secondary side capacitor C 35 in parallel is used to adjust resonance curve.In addition, capacitor C 67 is connected in series with fluorescent tube 37, is used to reduce the feature of liquid crystal panel own to influence that fluorescent tube produced.Feedback circuit 38 is connected in the other end of fluorescent tube 37, it comprises a pair of halfwave rectifier diode D5 and D8, be used for AC signal is rectified into the signal that has only positive half wave, and a sample resistance R100, be used for the sampling of the current value of this fluorescent tube 37 of flowing through and change into voltage feedback signal FB outputing to this control circuit for pulse-width modulation 30.This circuit 30 is exported this output signal PWM 2 and PWM 1 according to this feedback signal, is respectively applied for the duty cycle of control top drive circuit 31 and below drive circuit 32, so that regulate the brightness of fluorescent tube 37.
Best, voltage detecting circuit 36 also comprises a lagging circuit (hysteresis circuit), mainly is made up of switch Q39 and resistance R 22k, is used to adjust the threshold value that control switch Q15 switches.For example, if switching frequency-impedance relationship curve when the external communication voltage that circuit design of the present invention becomes to import in Fig. 2 supply unit is 150V (interchange) is then if input voltage all can make switch Q15 produce misoperation in producing small change up and down near the 150V (interchange).After lagging circuit is set, can make the signal of delivering to this switch Q15 can carry out switching really, avoid generation of false action, for example, under the situation that voltage rises, must surpass 160V (interchange) and just can make switch Q15 conducting, and under the situation that voltage descends, then must be lower than 140V (interchange) and just can make not conducting of switch.
Present embodiment only is illustrative rather than definitive thereof, and other modification also is feasible.For example, as shown in Figure 6, impedance adjustment circuit 34 can be two first inductance L 61 that is connected in series and second inductance L 62, and this second inductance L 62 is connected in parallel with control switch Q15.In addition, also the first siding ring that two tandem electric inductance L61 and the L62 of above-mentioned Fig. 6 can be transformed to an inductance L 7 and transformer T3 is connected in parallel, and switch Q15 then connects with inductance L 7, forms the circuit as Fig. 7.In addition, also can make switch Q15 be directly connected in the first siding ring of transformer T3 wherein, so can utilize the conducting of switch Q15 or not conducting and change the number of turns of transformer T3 first siding ring, and then change equivalent impedance, as shown in Figure 8.
In the preferred embodiment of Fig. 5 of the present invention, switch 33 adopts a half-bridge (half-bridge) structure, yet switch 33 also can adopt full-bridge (full-bridge) or recommend (push-pull) formula structure etc.Switch M1 and M2 can use the transistor of MOS field-effect transistor or any other kind.Drive circuit 31 and 32 also only is the example of explanation, and visual side circuit needs and adopts the design of other form.In addition, though impedance adjustment circuit 34 is shown as the primary side that is connected transformer T3,, also can connect secondary side at transformer T3, that is, the impedance adjustment circuit among Fig. 5 34 changed into be connected between capacitor C 35 and the earth terminal, can reach the effect that frequency-impedance relationship curve switches equally.
Though the present invention with a preferred embodiment openly as above; so it is not to be used to limit the present invention; any those skilled in the art; under situation without departing from the spirit or scope of the invention; can do and change and change, so protection scope of the present invention is when looking being as the criterion that accompanying Claim limits.
Claims (30)
1. a supply unit is used to provide power supply to comprise the system of fluorescent tube, comprising:
One rectification/filter, it has an input, is connected to an external ac power source, is used for converting this input ac voltage to direct voltage, and has an output, to export this direct voltage;
Flow to direct current (DC-DC) transducer, the output that it is connected to this rectification/filter is used for converting this direct voltage step-down to a fixedly direct voltage output, to power to the system except that this fluorescent tube always; And
Flow to exchange (DC-AC) converter, its and this direct current is used for that this direct voltage is converted to an alternating voltage and exports to the parallel output that is connected to this rectification/filter of direct current transducer always, with to this lamp tube power supply,
Wherein, this direct current further comprises to alternating-current converter:
Two switches, it respectively has a control input end;
One drive circuit is electrically connected to the control input end of these two switches, is used to drive this two switch alternate conduction;
One transformer, its primary side are electrically connected to this two switches, and secondary side is electrically connected to this fluorescent tube;
One sample circuit is electrically connected to this fluorescent tube, is used for detecting flowing through this lamp tube current value and exporting a feedback signal;
One modulation control circuit is electrically connected to this sample circuit and this drive circuit, is used for controlling this drive circuit according to this feedback signal;
One voltage detecting circuit, it has an input, is used for the voltage swing according to this input, exports a control signal; And
One impedance adjustment circuit is electrically connected to this voltage detecting circuit and this transformer, is used for adjusting its equivalent impedance according to this control signal.
2. supply unit as claimed in claim 1, wherein, this system is a LCD.
3. supply unit as claimed in claim 1, wherein, this system is a personal computer.
4. supply unit as claimed in claim 1, wherein, this system is a portable computer.
5. supply unit as claimed in claim 1, wherein, the voltage range of this external ac power source is in about 90 in the voltage range of 270V.
6. supply unit as claimed in claim 1, wherein, the input of this voltage detecting circuit is electrically connected to the output of this rectification/filter.
7. supply unit as claimed in claim 1, wherein, the input of this voltage detecting circuit is electrically connected to this external ac power source.
8. supply unit as claimed in claim 1, wherein, this transformer is a step-up transformer.
9. supply unit as claimed in claim 1, wherein, the operational frequency range of this converter is to be in about 50KHz in the frequency range of 65KHz.
10. supply unit as claimed in claim 1, wherein, this impedance adjustment circuit is the primary side that is electrically connected to this transformer.
11. supply unit as claimed in claim 1, wherein, this impedance adjustment circuit is electrically connected to the secondary side of this transformer.
12. supply unit as claimed in claim 1, wherein, this modulation control circuit is to be a control circuit for pulse-width modulation, is used for controlling according to this feedback signal the duty cycle of this drive circuit.
13. supply unit as claimed in claim 1, wherein, this modulation control circuit is to be a frequency modulation(FM) control circuit, is used for controlling according to this feedback signal the switching frequency of this drive circuit.
14. a converter is used to drive a discharge lamp, this converter comprises:
Two switches, it respectively has a control input end;
One drive circuit is electrically connected to the control input end of these two switches, is used to drive this two switch alternate conduction;
One transformer, its primary side are electrically connected to this two switches, and secondary side is electrically connected to this fluorescent tube;
One sample circuit is electrically connected to this fluorescent tube, is used for detecting flowing through this lamp tube current value and exporting a feedback signal;
One modulation control circuit is electrically connected to this sample circuit and this drive circuit, is used for controlling this drive circuit according to this feedback signal;
One voltage detecting circuit is used for the voltage swing according to this converter of input, exports a control signal; And
One impedance adjustment circuit is electrically connected to this voltage detecting circuit and this transformer, is used for adjusting its equivalent impedance according to this control signal.
15. converter as claimed in claim 14, wherein, this transformer is a step-up transformer.
16. converter as claimed in claim 14, wherein, the operational frequency range of this converter is to be in about 50KHz in the frequency range of 65KHz.
17. converter as claimed in claim 14, wherein, this impedance adjustment circuit is electrically connected to the primary side of this transformer.
18. converter as claimed in claim 14, wherein, this impedance adjustment circuit is electrically connected to the secondary side of this transformer.
19. converter as claimed in claim 14, wherein, these two switches are to be the MOS field-effect transistor.
20. converter as claimed in claim 14, wherein, this impedance adjustment circuit is to comprise a control switch, it has a control input end, be electrically connected to this voltage detecting circuit, control this control switch conducting or not conducting according to this control signal, to adjust the equivalent impedance of this impedance adjustment circuit.
21. converter as claimed in claim 14, wherein, this modulation control circuit is to be a control circuit for pulse-width modulation, is used for controlling according to this feedback signal the duty cycle of this drive circuit.
22. converter as claimed in claim 14, wherein, this modulation control circuit is to be a frequency modulation(FM) control circuit, is used for controlling according to this feedback signal the switching frequency of this drive circuit.
23. a converter is used to drive a discharge lamp, this converter comprises:
Two switching transistors, it respectively has a control input end;
One drive circuit is electrically connected to the control input end of these two switching transistors, is used to drive these two switching transistors by the driving frequency alternate conduction;
One transformer, it has first siding ring and second siding ring, and this first siding ring is electrically connected to this two switching transistors, and this second siding ring is electrically connected to this fluorescent tube;
One sample circuit, it comprises a sample resistance, is connected in series in this fluorescent tube, is used for detecting flowing through this lamp tube current value and exporting a feedback signal;
One modulation control circuit is electrically connected to this sample circuit and this drive circuit, is used for controlling this drive circuit according to this feedback signal, to regulate the brightness of this fluorescent tube;
One voltage detecting circuit, it comprises a comparator, and an input of this comparator is electrically connected to the input voltage of this converter, and another input is electrically connected to a predefined reference voltage, be used for exporting a control signal according to the input voltage of this converter and the comparative result of this reference voltage; And
One impedance adjustment circuit, the one end is electrically connected to this transformer, the other end is electrically connected to this voltage detecting circuit via the control input end of a control switch, controls this control switch conducting or not conducting according to this control signal, to adjust the equivalent impedance of this impedance adjustment circuit.
24. converter as claimed in claim 23, wherein, an end of this impedance adjustment circuit is electrically connected to the first siding ring of this transformer.
25. converter as claimed in claim 23, wherein, an end of this impedance adjustment circuit is electrically connected to the second siding ring of this transformer.
26. converter as claimed in claim 23, wherein, this impedance adjustment circuit comprises first capacitor and second capacitor in parallel, and the tie point of this first and second capacitor is electrically connected to the first siding ring of this transformer, and this second capacitors in series connects this control switch.
27. converter as claimed in claim 23, wherein, this impedance adjustment circuit comprises first inductor and second inductor of series connection, and an end of this first inductor is electrically connected to the first siding ring of this transformer, this second inductor this control switch that is connected in parallel.
28. converter as claimed in claim 23, wherein, this voltage detecting circuit also comprises a lagging circuit, is used to adjust the threshold value that this control switch switches.
29. converter as claimed in claim 23, wherein, this impedance adjustment circuit comprises first inductor, and the one end is electrically connected to the first siding ring of this transformer, and is connected in series with this control switch.
30. converter as claimed in claim 23, wherein, this control switch of this impedance adjustment circuit is connected in the first siding ring of this transformer, to change equivalent impedance by the number of turns that changes this first siding ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011375507A CN100391315C (en) | 2001-10-29 | 2001-10-29 | Power supply unit and used current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011375507A CN100391315C (en) | 2001-10-29 | 2001-10-29 | Power supply unit and used current converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1416305A CN1416305A (en) | 2003-05-07 |
| CN100391315C true CN100391315C (en) | 2008-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011375507A Expired - Fee Related CN100391315C (en) | 2001-10-29 | 2001-10-29 | Power supply unit and used current converter |
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| CN (1) | CN100391315C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101332228B1 (en) | 2008-12-26 | 2013-11-25 | 메키트 에퀴지션 코포레이션 | Chip packages with power management integrated circuits and related techniques |
| CN101854769B (en) * | 2009-04-02 | 2012-11-28 | 华映视讯（吴江）有限公司 | Light source brightness control circuit and method |
| CN104735873B (en) * | 2015-03-18 | 2017-08-18 | 深圳市锦兴流明科技有限公司 | A kind of change-over circuit and lamp of compatible fluorescent lamp ballast |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886424A (en) * | 1996-07-10 | 1999-03-23 | Samsung Electronics Co., Ltd. | Power supply apparatus for portable computer and DC input selection circuit adapted to the same |
| CN2443427Y (en) * | 2000-08-07 | 2001-08-15 | 阎建平 | Centralized power supply device for computer and external device |
-
2001
- 2001-10-29 CN CNB011375507A patent/CN100391315C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886424A (en) * | 1996-07-10 | 1999-03-23 | Samsung Electronics Co., Ltd. | Power supply apparatus for portable computer and DC input selection circuit adapted to the same |
| CN2443427Y (en) * | 2000-08-07 | 2001-08-15 | 阎建平 | Centralized power supply device for computer and external device |
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| CN1416305A (en) | 2003-05-07 |
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Assignee: Guolian Electronics (Shanghai) Co., Ltd. Assignor: Hon Hai Precision Industry Co., Ltd. Contract fulfillment period: 2008.6.28 to 2021.10.29 contract change Contract record no.: 2009990000259 Denomination of invention: Power supply unit and used current converter Granted publication date: 20080528 License type: Exclusive license Record date: 2009.4.2 |
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