CN1171377C - Power supply and computer device with it - Google Patents
Power supply and computer device with it Download PDFInfo
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- CN1171377C CN1171377C CNB001286900A CN00128690A CN1171377C CN 1171377 C CN1171377 C CN 1171377C CN B001286900 A CNB001286900 A CN B001286900A CN 00128690 A CN00128690 A CN 00128690A CN 1171377 C CN1171377 C CN 1171377C
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Abstract
The present invention relates to a power supplier for controlling the power output of a power supplier according to a first signal input by a computer mainframe, which comprises a rectifying device, a power transformer, a power control circuit and a switching device, wherein the rectifying device is used for providing a direct current power supply; the power supply transformer receives the direct current power supply and outputs an output power supply and a second signal; the power control circuit is used for controlling the output power supply of the power supply transformer according to the second signal; the switching device is switched on to provide the second signal for driving the power supply control circuit when the first signal is detected to enable the power supplier to normally work. Thus, the power supplier can act according to a state of the computer mainframe.
Description
The present invention relates to a kind of power supply unit, particularly a kind of external power source that is provided by the detection computations machine host is to start the power supply unit of display.
At present, most computer product and peripheral device all adopt switched-mode power supply (switchingpower), and it utilizes PM (pulse width modulation) control integrated circuit (IC) to come as power control circuit.General this type of PM control IC all must have enough voltage and electric current just to be started, and for example 3842, and the IC controller of 3844 series, therefore needs a start-up circuit to make the IC can regular event.Yet start-up circuit only uses when start-up circuit, after IC starts, promptly changes the electric power of being supplied subsequent operation by accessory power supply, and this moment, this start-up circuit became the burden of useless and consumed power on the contrary.
Fig. 1 represents the line block diagram of a conventional power source supply, and the back coupling voltage stabilizing control circuit of output voltage then omits and will not illustrate to simplify invention in this figure.As shown in Figure 1, a rectifier 1, for example bridge rectifier is converted into direct voltage with AC-input voltage.One commutation condenser 2 is in order to reduce pulsation (ripple) voltage of direct voltage.Above-mentioned direct voltage starts power supply control chip 5 (is example with 3842 controllers at this) by starting resistance 3 charge initiation capacitors 4, after power supply control chip 5 starts, export the grid of a high-frequency pulse signal, use making oxide-semiconductor control transistors 6 carry out change action fast to oxide-semiconductor control transistors 6 (is example with N type metal oxide semiconductor transistor NMOS at this).Transformer 7, comprise the first winding 7a (or claiming main winding), the second winding 7b, reach tertiary winding 7c, wherein the first winding 7a is coupled to the drain electrode of nmos pass transistor 6, action by above-mentioned oxide-semiconductor control transistors 6, the magnetic flux of the winding 7a that wins is changed, thus the second winding 7b, and tertiary winding 7c respond to respectively and obtain a high-frequency pulse voltage.The pulse voltage that the second winding 7b is responded to is after an output diode 9 rectifications, reaching an output capacitor 10 reduction pulsation, output as power supply unit, and the pulse voltage that tertiary winding 7c is responded to is through a booster diode 8 rectifications and start and to provide to power supply control chip 5 after capacitor 4 reduces pulsation, and power supply control chip 5 promptly thus power supply as the driving voltage of its work.
The operation principle of above-mentioned power supply unit is as follows, when above-mentioned power supply unit input ac voltage, alternating voltage through rectifier 1, and commutation condenser 2 be converted into direct voltage, and this direct voltage charges to starting capacitor 4 via starting resistance 3, along with the increase of A end points direct voltage, the voltage potential of B end points also increases.(is that example is 16V with 3842 controllers) power supply control chip 5 will start and exports a high-frequency pulse signal when the voltage of B end points arrives a specific voltage.Oxide-semiconductor control transistors 6 is carried out change action after accepting above-mentioned high-frequency signal, so that power conversions to the second winding 7b that the first winding 7a is stored, and tertiary winding 7c.The pulse voltage that the second winding 7b is responded to through an output diode 9 rectifications, and an output capacitor 10 use as the output of power supply unit after reducing pulsation and operate for All other routes (not shown).The pulse voltage that tertiary winding 7c is responded to is through booster diode 8 rectifications and after starting capacitor 4 and reducing pulsation, provides to power supply control chip 5 it is operated.
As from the foregoing, power supply unit is at the beginning of input ac voltage, starting power supply control chip 5 required voltages is to be provided starting capacitor 4 chargings through starting resistance by direct voltage, and after oxide-semiconductor control transistors 6 began to carry out its change action, the required voltage of power supply control chip 5 work was then provided by the tertiary winding 7c of transformer 7.Yet circulating current will cause the loss of excess power on starting resistance.The power consumption of starting resistance 3 can be calculated as follows (is that 3842 controllers are example with power control circuit).
The input power specification of general computer and peripheral device thereof is between alternating voltage 90V～264V, when AC-input voltage is minimum 90V, via rectifier 1, and the direct voltage that obtains of commutation condenser 2 be about 90V * 1.414=127.6V, the required starting current of 3842 controllers is minimum to be 1mA, so the maximum value of starting resistance 3 is: (dc voltage-starting resistor)/1mA=(127.26V-16V)
2/ 1mA=111260 Ω; When AC-input voltage during for the highest 264V, via rectifier 1, and the direct voltage that obtains of commutation condenser 2 be about 264V * 1.414=373.296V, because starting the back, 3842 controllers only need the above operating voltage of 10V, so the power consumption of starting resistance 3 is (dc voltage-operating voltage)
2/ (starting resistance value)=(373.296V-10V)/111260 Ω=1.18W.General computer and the essential electricity-saving function of peripheral equipment (power saving function) thereof all require the power consumption under battery saving mode (off-mode) to need less than 3W, can't reach in the pattern of DPMS and the consumption of above-mentioned about 1.18W is often feasible, power consumption is less than the standard of 3W.
Yet known technology can reduce the power consumption of starting resistance, but can't cooperate power saving IC action, and carries out rapid re-strike (restart).Power supply unit now often need cooperate power saving IC (powersaving IC) to operate under its DPMS pattern, generally be to cut off some by power saving IC control wouldn't use the power supply of circuit, for example fluoroscopic level, and vertical scanning signal, but the output that power supply unit must can continue to supply the required pact of power saving IC+5V voltage again, reach approximate number 10mA electric current.In order to satisfy this requirement, if allow the power supply unit perseveration, only other outputs are cut off staying+5V exports to power saving IC (just so level, vertical signal can automatically reply when recovering) and then can't reach the specification requirement that power consumption need be lower than 3W.Thus, and can't reach the effect of power saving really, showing needs to improve the foregoing circuit structure to reach purpose of power saving really.
Thus, main purpose of the present invention is for a kind of power supply unit is provided, and its power supply signal of being exported under general modfel according to main frame operates.When main frame enters the DPMS pattern, can interrupt exporting to the power supply signal of display, and the i.e. shut-down operation thereupon of power supply unit of display at this moment reaches the purpose of certain saving electric power, and can simplify the complexity of circuit and reduce manufacturing cost.
For obtaining above-mentioned purpose, the present invention proposes a kind of power supply unit, is applicable to that this supply comprises according to an out-put supply of being controlled above-mentioned power supply unit by one first signal of outside input: a rectifying device, in order to a direct current power supply to be provided; One power transformer in order to receiving described DC power supply, and is exported a described out-put supply and a secondary signal; One power control circuit is in order to control the out-put supply of described power transformer according to described secondary signal; It is characterized in that, also comprise: a switching device, this switching device is the state according to described first signal, described secondary signal closed or conducting to described power control circuit, thereby make described power transformer connection work, thereby or disconnect and to make external ac power source can't import described power supply unit; Wherein said power control circuit comprises: a power supply control chip is coupled to described switching device; And an oxide-semiconductor control transistors, being coupled between described power supply control chip and the power transformer, switch switches to control the output voltage size of described power transformer in order to the switching signal of exporting according to described power supply control chip; Described power transformer comprises: one first winding, one second winding and the tertiary winding, wherein said DC power supply is to be applied on described first winding and the oxide-semiconductor control transistors, and making described second winding and the tertiary winding produce described out-put supply and secondary signal respectively by the change action of described oxide-semiconductor control transistors, described secondary signal is as the power supply of described power control circuit.
In addition, another object of the present invention is to provide a kind of computer installation, comprising: a main frame, in order to one first signal to be provided; And a display, have a power supply unit, to export an out-put supply according to described first signal and use for described display, wherein said power supply unit comprises: a rectifying device, in order to a direct current power supply to be provided; One power transformer in order to receiving described DC power supply, and is exported a described out-put supply and a secondary signal; One power control circuit is in order to control the size of the out-put supply of described power transformer according to described secondary signal; It is characterized in that, also comprise: a switching device, this switching device is the state according to described first signal, described secondary signal closed or conducting to described power control circuit, thereby make described power transformer connection work, thereby or disconnect and to make external ac power source can't import described power supply unit; Wherein said power control circuit comprises: a power supply control chip is coupled to described switching device; And an oxide-semiconductor control transistors, being coupled between described power supply control chip and the power transformer, switch switches to control the output voltage size of described power transformer in order to the switching signal of exporting according to described power supply control chip; Described power transformer comprises: one first winding, one second winding and the tertiary winding, wherein said DC power supply is to be applied on described first winding and the oxide-semiconductor control transistors, and making described second winding and the tertiary winding produce described out-put supply and secondary signal respectively by the change action of described oxide-semiconductor control transistors, described secondary signal is as the power supply of described power control circuit.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, elaborate.
Fig. 1 is the line block diagram that shows a conventional power source supply.
Fig. 2 is the line block diagram that shows according to embodiment of the invention power supply unit.
Fig. 3 is the outside drawing that shows according to main frame in the embodiment of the invention and display.
With reference to Fig. 2, Fig. 2 represents the circuit block diagram according to the embodiment of the invention.For simplicity, the back coupling voltage stabilizing control circuit of output voltage then omits and will not illustrate in Fig. 2, wherein with known conventional art components identical with identical symbology.
As shown in Figure 2, rectifying device 11 comprises a bridge rectifier 1 and a capacitor 2, is DC power supply in order to the AC power rectification that the outside is provided.Power transformer 7 comprises the first winding 7a, the second winding 7b and tertiary winding 7c.Power control circuit 12 comprises power supply control chip 5 and oxide-semiconductor control transistors 6, be a nmos pass transistor at this with above-mentioned oxide-semiconductor control transistors 6, and the integrated circuit that above-mentioned power supply control chip 5 can be in integrated circuit model 3842 and 3844 series is an example.Power supply control chip 5 output switching signals are with Switch Control transistor 6, use that the electric current that makes power transformer 7 first winding 7a changes and produce induced voltage to produce out-put supply respectively at the second winding 7b and tertiary winding 7c respectively.Switching device 13 is a relay at this, and in order to the power supply signal Vin that detection computations machine host (not shown) is provided, this power supply signal Vin is the main frame 31 by as shown in Figure 3, is sent to the power supply unit of display 32 inside via the sequence transmission line.When switching device 13 detects above-mentioned power supply signal Vin, then conducting, thus provide the tertiary winding voltage that 7c is produced to power control circuit 12.Be herein when detecting above-mentioned power supply signal Vin and exist with switching device 13 then conducting be example, otherwise certainly, conducting does not repeat them here also for feasible if detect when existing less than above-mentioned power supply signal Vin then with switching device 13.Moreover, in the present embodiment, above-mentioned switching device 13 is to change its conducting or closing state according to the power supply signal Vin that main frame 31 is provided, and switching device 13 of the present invention can detect any by signal that main frame 31 sent and change its conducting or closing state.Between the tertiary winding 7c and switching device 13 of power transformer 7, have a protection diode 8, its positive pole is the tertiary winding 7c that is coupled to power transformer 7, and negative pole is to be coupled to switching device 13.Start-up circuit 14 is made up of a plurality of resistance 3 and electric capacity 4.
The operation principle of above-mentioned power supply unit is as described below, operates in general modfel at this default main frame 31, thus its provide a power supply signal Vin to display 32 with actuating switch device 13.When the power supply unit of display 32 inside receives alternating voltage, alternating voltage through rectifier 1, and commutation condenser 2 be converted into direct voltage, and above-mentioned direct voltage provides to power supply control chip 5 via start-up circuit 14, will start power supply control chip 5 to provide a high-frequency pulse signal to oxide-semiconductor control transistors 6.Oxide-semiconductor control transistors 6 is accepted above-mentioned high-frequency signal and is carried out change action, uses power conversion to the second winding 7b, reaches tertiary winding 7c.The pulse voltage that the second winding 7b is responded to through an output diode 9 rectifications, and an output capacitor 10 use output after reducing pulsation as power supply unit, required to supply with All other routes (not shown) action.
When main frame 31 operates in battery saving mode (DPMS), this moment, main frame no longer provided power supply signal Vin, therefore switching device 13 cuts out and causes power supply control chip 5 to stop action because of receiving driving power, because the anergy of power supply control chip 5, cause the control switch 6 can't handover operation and cause power transformer 7 can't produce induced voltage, and external ac power source also because lacking current path, this power supply unit can't be imported power supply unit so far.Therefore no longer include power consumption.
By the design of foregoing circuit, when main frame 31 operated in battery saving mode (DPMS), power supply unit was shut-down operation.Moreover, its inner other circuit element also no longer consumes electric power, has solved the shortcoming of conventional art.
Though the present invention discloses as above with preferred embodiment; so it is not in order to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; can do a little change and retouching, so protection scope of the present invention should be with being as the criterion that the claim scope is defined.
Claims (24)
1. a power supply unit is applicable to an out-put supply of controlling above-mentioned power supply unit according to one first signal of being imported by the outside, and this supply comprises:
One rectifying device is in order to provide a direct current power supply;
One power transformer in order to receiving described DC power supply, and is exported a described out-put supply and a secondary signal;
One power control circuit is in order to control the out-put supply of described power transformer according to described secondary signal; It is characterized in that, also comprise:
One switching device, this switching device is the state according to described first signal, described secondary signal closed or conducting to described power control circuit, thereby make described power transformer connection work, thereby or disconnect and make external ac power source can't import described power supply unit;
Wherein said power control circuit comprises:
One power supply control chip is coupled to described switching device; And
One oxide-semiconductor control transistors is coupled between described power supply control chip and the power transformer, and switch switches to control the output voltage size of described power transformer in order to the switching signal of exporting according to described power supply control chip;
Described power transformer comprises: one first winding, one second winding and the tertiary winding, wherein said DC power supply is to be applied on described first winding and the oxide-semiconductor control transistors, and making described second winding and the tertiary winding produce described out-put supply and secondary signal respectively by the change action of described oxide-semiconductor control transistors, described secondary signal is as the power supply of described power control circuit.
2. power supply unit as claimed in claim 1, wherein said first signal is a power supply signal.
3. power supply unit as claimed in claim 1, wherein said oxide-semiconductor control transistors are a nmos pass transistor.
4. power supply unit as claimed in claim 1, wherein said power supply control chip can be integrated circuit model 3842, reach the integrated circuit in 3844 series.
5. power supply unit as claimed in claim 1 also comprises a protection diode, and the positive pole of described protection diode is coupled to the tertiary winding of described power transformer, and negative pole is coupled to described switching device.
6. power supply unit as claimed in claim 1, wherein said rectifying device comprise a bridge rectifier and a capacitor.
7. power supply unit as claimed in claim 1, wherein said switching device are a relay.
8. power supply unit as claimed in claim 1 also comprises a start-up circuit, is made up of a plurality of resistance of the described DC power supply of acceptance and the electric capacity that charged by described DC power supply.
9. computer installation comprises:
One main frame is in order to provide one first signal; And
One display has a power supply unit, exports an out-put supply according to described first signal and uses for described display, and wherein said power supply unit comprises:
One rectifying device is in order to provide a direct current power supply;
One power transformer in order to receiving described DC power supply, and is exported a described out-put supply and a secondary signal;
One power control circuit is in order to control the size of the out-put supply of described power transformer according to described secondary signal; It is characterized in that, also comprise:
One switching device, this switching device is the state according to described first signal, described secondary signal closed or conducting to described power control circuit, thereby make described power transformer connection work, thereby or disconnect and make external ac power source can't import described power supply unit;
Wherein said power control circuit comprises:
One power supply control chip is coupled to described switching device; And
One oxide-semiconductor control transistors is coupled between described power supply control chip and the power transformer, and switch switches to control the output voltage size of described power transformer in order to the switching signal of exporting according to described power supply control chip;
Described power transformer comprises: one first winding, one second winding and the tertiary winding, wherein said DC power supply is to be applied on described first winding and the oxide-semiconductor control transistors, and making described second winding and the tertiary winding produce described out-put supply and secondary signal respectively by the change action of described oxide-semiconductor control transistors, described secondary signal is as the power supply of described power control circuit.
10. computer installation as claimed in claim 9, wherein said first signal is a power supply signal.
11. computer installation as claimed in claim 9, wherein said oxide-semiconductor control transistors are a nmos pass transistor.
12. computer installation as claimed in claim 9, wherein said power supply control chip can be integrated circuit model 3842, reach the integrated circuit in 3844 series.
13. computer installation as claimed in claim 9 also comprises a protection diode, the positive pole of described protection diode is coupled to the tertiary winding of described power transformer, and negative pole is coupled to described switching device.
14. computer installation as claimed in claim 9, wherein said rectifying device comprise a bridge rectifier and a capacitor.
15. computer installation as claimed in claim 9, wherein said switching device are a relay.
16. computer installation as claimed in claim 9 also comprises a start-up circuit, is made up of a plurality of resistance of the described DC power supply of acceptance and the electric capacity that charged by described DC power supply.
17. a display equipment is connected in a main frame that one first signal can be provided, described display equipment comprises:
One power supply unit is exported an out-put supply according to described first signal and is used for described display, and wherein said power supply unit comprises:
One rectifying device is in order to provide a direct current power supply;
One power transformer in order to receiving described DC power supply, and is exported a described out-put supply and a secondary signal;
One power control circuit is in order to control the size of the out-put supply of described power transformer according to described secondary signal; It is characterized in that, also comprise:
One switching device, this switching device is the state according to described first signal, described secondary signal closed or conducting to described power control circuit, thereby make described power transformer connection work, thereby or disconnect and make external ac power source can't import described power supply unit;
Wherein said power control circuit comprises:
One power supply control chip is coupled to described switching device; And
One oxide-semiconductor control transistors is coupled between described power supply control chip and the power transformer, and switch switches to control the output voltage size of described power transformer in order to the switching signal of exporting according to described power supply control chip;
Described power transformer comprises: one first winding, one second winding and the tertiary winding, wherein said DC power supply is to be applied on described first winding and the oxide-semiconductor control transistors, and making described second winding and the tertiary winding produce described out-put supply and secondary signal respectively by the change action of described oxide-semiconductor control transistors, described secondary signal is as the power supply of described power control circuit.
18. display equipment as claimed in claim 17, wherein said first signal is a power supply signal.
19. display equipment as claimed in claim 17, wherein said oxide-semiconductor control transistors are a nmos pass transistor.
20. display equipment as claimed in claim 17, wherein said power supply control chip can be integrated circuit model 3842, reach the integrated circuit in 3844 series.
21. display equipment as claimed in claim 17 also comprises a protection diode, the positive pole of described protection diode is coupled to the tertiary winding of described power transformer, and negative pole is coupled to described switching device.
22. display equipment as claimed in claim 17, wherein said rectifying device comprise a bridge rectifier and a capacitor.
23. display equipment as claimed in claim 17, wherein said switching device are a relay.
24. display equipment as claimed in claim 17 also comprises a start-up circuit, is made up of a plurality of resistance of the described DC power supply of acceptance and the electric capacity that charged by described DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001286900A CN1171377C (en) | 2000-09-20 | 2000-09-20 | Power supply and computer device with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001286900A CN1171377C (en) | 2000-09-20 | 2000-09-20 | Power supply and computer device with it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1344056A CN1344056A (en) | 2002-04-10 |
| CN1171377C true CN1171377C (en) | 2004-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001286900A Expired - Fee Related CN1171377C (en) | 2000-09-20 | 2000-09-20 | Power supply and computer device with it |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1171377C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101241171B (en) * | 2007-02-08 | 2010-09-22 | 佛山市顺德区顺达电脑厂有限公司 | Power supply apparatus test device and method |
| CN104253529B (en) * | 2013-06-25 | 2018-06-15 | 无锡华润上华科技有限公司 | The start-up circuit and power management chip of power management chip |
-
2000
- 2000-09-20 CN CNB001286900A patent/CN1171377C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1344056A (en) | 2002-04-10 |
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