CN100438300C - Power supply detecting cirucit with power-saving under ready condition - Google Patents
Power supply detecting cirucit with power-saving under ready condition Download PDFInfo
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- CN100438300C CN100438300C CNB2004100458285A CN200410045828A CN100438300C CN 100438300 C CN100438300 C CN 100438300C CN B2004100458285 A CNB2004100458285 A CN B2004100458285A CN 200410045828 A CN200410045828 A CN 200410045828A CN 100438300 C CN100438300 C CN 100438300C
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Abstract
The present invention provides a power supply detection circuit which has the advantages that the present invention can reduce unnecessary power loss in a stand-by state so as to save power consumption. The power supply detection circuit of the present invention is used for receiving input voltage and converting the input voltage into output voltage which has a different voltage level with the input voltage. The present invention is composed of an electromagnetic interference filter, a bridge rectifier, a transistor switch, a driver and a circuit box, wherein the electromagnetic interference filter is used for eliminating the common mode noise of input voltage, the bridge rectifier is connected with the electromagnetic interference filter and is used for carrying out full-wave rectification to the input voltage, the transistor switch is connected with the bridge rectifier, the driver is connected with the transistor switch and is used for driving the on-off operation of the transistor switch according to a feed back value of the output voltage, the circuit box is connected with the electromagnetic interference filter, the bridge rectifier and the driver and is used for providing discharge path for the electromagnetic interference filter, and meanwhile, the circuit box samples the input voltage so as to detect the change of the input voltage.
Description
Technical field
The present invention relates to a kind of power sensor detecting circuit, the particularly a kind of power sensor detecting circuit that can under holding state, operate the time saving power consumption.
Background technology
Generally speaking, one ac/dc adapter, be used for receiving the AC mains of input, and alternating current is converted to the direct current of high-voltage level, to provide DC-DC converter to convert high-voltage level to different low voltage level, be used for operating an electronic installation so that provide, as the electric supply of desktop PC.
The circuit configurations of known ac/dc adapter are shown in Fig. 1.The ac/dc adapter of Fig. 1 comprises an input ac power Vin, one Electromagnetic interference filter (EMI filter) 11, one bridge rectifier (bridge rectifier) 12, one input voltage circuit for detecting 13, one energy storage component 14, one transistor switch Q1, a driver 15, and an output filter 16.Electromagnetic interference filter 11 is made up of an input power filtering capacitor X-cap, and it is used for eliminating the differential mode noise (differential-mode noise) of input voltage vin.Import power filtering capacitor X-cap and three discharge resistance Rx parallel connections of connecting mutually, and the discharge path of input power filtering capacitor X-cap is provided by discharge resistance Rx.Bridge rectifier 12 is made up of several diodes, and it is used for the input voltage of AC power Vin is carried out full-wave rectification.The alternating voltage of being exported by bridge rectifier 12 passes through the ac/dc adapter again, and exports a direct current voltage.Storage power when energy storage component 14 is ON at transistor switch Q1, and releasing energy to output filter 16 during for OFF as transistor switch Q1.Output filter 16 is made up of diode D1 and capacitor C 1, and it is in order to carry out filtering to output dc voltage.Driver 15 is worth to come driving transistors switch Q1 conducting and ends in order to the back coupling according to output dc voltage, and then the magnitude of voltage of stable output dc voltage.In addition, the ac/dc adapter of Fig. 1 also comprises an input power sensor detecting circuit 13, and it is taken a sample to input ac voltage so that detect the variation of input voltage, and the variation of input voltage provided gives driver 15.Generally speaking, input power sensor detecting circuit 13 is made of the voltage divider (voltage divider) that resistance R and r formed, and the resistance value of resistance r is much smaller than the resistance value of resistance R.
Portable electronic devices major part now all possesses power management function, and can regulate the distribution of power supply and the parameter of setting stand-by operation pattern in response to user's demand.Therefore the more power saving and can working long period of time of present portable electronic devices.Yet when entering holding state in system, though the inner most active electronic building brick of electric pressure converter, all entered the state of power-off (shut down) and shut-down operation as transistor switch Q1 and driver 15 etc., but some passive electronic building bricks all can continue to receive input ac power and produce power consumption as discharge resistance 3Rx and the input resistance R of power sensor detecting circuit 13 and r.The meaningless power loss that these are caused when operating under holding state will significantly increase the electrical source consumption of system.
Therefore, reduce when how to allow electric pressure converter under holding state, operate because the caused power loss of resistance is the target that the present invention will pursue to save electrical source consumption.
Summary of the invention
Main purpose of the present invention is to propose a kind of power sensor detecting circuit that can operate the time saving power consumption under holding state.
According to preferred embodiment of the present invention, in order to reach purpose of the present invention, a kind of power sensor detecting circuit is provided, it is in order to receive an input voltage and to convert this input voltage to have with the different voltage levels of this input voltage a output voltage, it comprises: an Electromagnetic interference filter, in order to eliminate the differential mode noise of this input voltage; One bridge rectifier is connected to this Electromagnetic interference filter, in order to this input voltage is carried out full-wave rectification; One transistor switch is connected to this bridge rectifier; One driver is connected to this transistor switch, is worth the on/off operation that drives this transistor switch in order to the back coupling according to this output voltage; And a circuit box, be connected to this Electromagnetic interference filter, this bridge rectifier and this driver, in order to being provided, a discharge path gives this Electromagnetic interference filter, simultaneously this input voltage is taken a sample so that detect the variation of this input voltage.
According to the power sensor detecting circuit of above-mentioned conception, it is a kind of ac/dc adapter.
According to the power sensor detecting circuit of above-mentioned conception, wherein this Electromagnetic interference filter comprises at least one input power filtering capacitor.
According to the power sensor detecting circuit of above-mentioned conception, wherein this bridge rectifier is made up of several diodes.
According to the power sensor detecting circuit of above-mentioned conception, also comprise an energy storage component, be connected between this bridge rectifier and this transistor switch, its on/off operation according to this transistor switch transmits a direct current voltage.
According to the power sensor detecting circuit of above-mentioned conception, also comprise an output filter, be connected to this energy storage component, in order to this output voltage is carried out filtering, and this output filter comprises a diode and an electric capacity.
According to the power sensor detecting circuit of above-mentioned conception, wherein this circuit box comprises: one first resistance, and have one first end and be connected to this Electromagnetic interference filter, and one second end; One second resistance has second end that one first end is connected to this first resistance, and one second end; One the 3rd resistance has second end that one first end is connected to this second resistance, and one second end is connected to this Electromagnetic interference filter; One first diode has one first end and is connected to first end of this second resistance and second end of this first resistance, and one second end; One second diode has one first end and is connected to first end of the 3rd resistance and second end of this second resistance, and one second end; One the 4th resistance has one first end and be connected to second end of this first diode and second end of this second diode, and one second end is connected to this driver; And one the 5th resistance, have second end that one first end is connected to the 4th resistance, and one second end is connected to an earth terminal.
The present invention also provides a kind of power sensor detecting circuit of saving standby power, and in order to receive an input voltage and this input voltage is changed, it comprises: an Electromagnetic interference filter, in order to eliminate the differential mode noise of this input voltage; One bridge rectifier is connected to this Electromagnetic interference filter, in order to this input voltage is carried out full-wave rectification; One transistor switch is connected to this bridge rectifier; One driver is connected to this transistor switch, is worth the on/off operation that drives this transistor switch in order to the back coupling according to this output voltage; And a power sensor detecting circuit, be connected to this Electromagnetic interference filter, this bridge rectifier and this driver, in order to being provided, a discharge path gives this Electromagnetic interference filter, simultaneously this input voltage is taken a sample so that detect the variation of this input voltage; Wherein this circuit box comprises: one first resistance, and have one first end and be connected to this Electromagnetic interference filter, and one second end; One second resistance has second end that one first end is connected to this first resistance, and one second end; One the 3rd resistance has second end that one first end is connected to this second resistance, and one second end is connected to this Electromagnetic interference filter; One first diode has one first end and is connected to first end of this second resistance and second end of this first resistance, and one second end; One second diode has one first end and is connected to first end of the 3rd resistance and second end of this second resistance, and one second end; One the 4th resistance has one first end and be connected to second end of this first diode and second end of this second diode, and one second end is connected to this driver; And one the 5th resistance, have second end that one first end is connected to the 4th resistance, and one second end is connected to an earth terminal.
According to the power sensor detecting circuit of above-mentioned conception, it is a kind of ac/dc adapter.
According to the power sensor detecting circuit of above-mentioned conception, wherein this Electromagnetic interference filter comprises at least one input power filtering capacitor, and this bridge rectifier is made up of several diodes.
According to the power sensor detecting circuit of above-mentioned conception, also comprise an energy storage component, be connected between this bridge rectifier and this transistor switch, its on/off operation according to this transistor switch transmits a direct current voltage.
According to the power sensor detecting circuit of above-mentioned conception, also comprise an output filter, be connected to this energy storage component, in order to this output voltage is carried out filtering, and this output filter comprises a diode and an electric capacity.
Description of drawings
The present invention will do explanation in more detail by the example conjunction with figs., wherein:
Fig. 1 shows the circuit configurations of known ac/dc adapter;
Fig. 2 shows and the relevant voltage oscillogram of known ac/dc adapter;
The equivalent electric circuit of the known ac/dc adapter of Fig. 3 to Fig. 6 displayed map 1; And
Fig. 7 shows the circuit configurations of the voltage adapter of a preferred embodiment of the present invention.
11: Electromagnetic interference filter
12: bridge rectifier
13: the input voltage circuit for detecting
14: energy storage component
15: driver
16: output filter
22: the first diodes
24: the second diodes
Embodiment
The resistance that the present invention is characterized in to be used for to detect the input power sensor detecting circuit inside that input voltage changes combines with the resistance of the discharge path of the Electromagnetic interference filter that is used to provide input, when reducing under holding state operation owing to power loss that resistance was caused.Detailed description about a preferred embodiment of the present invention is described below.
See also Fig. 2, it shows the relevant voltage oscillogram of known ac/dc adapter with Fig. 1, Fig. 2 (A) is the voltage oscillogram of input ac voltage Vin, Fig. 2 (B) carries out resulting voltage oscillogram after the full-wave rectification for input ac voltage Vin through bridge rectifier 12, and Fig. 2 (C) is the voltage oscillogram through input power sensor detecting circuit 13 resulting sampling input voltages.By the voltage oscillogram of Fig. 2 (B) as can be seen at input ac voltage Vin through after the full-wave rectification, the phase place of its formed voltage is similar to input ac voltage Vin, yet its amplitude but be one on the occasion of, no matter input ac voltage Vin is between positive half cycle or negative half-cycle.In Fig. 2 (C), the voltage divider that input power sensor detecting circuit 13 utilizes resistance R and r to be formed comes input ac voltage is taken a sample so that detect the variation of input voltage, and therefore the amplitude of resulting sampling input voltage will equal r * Vin/ (r+R).Driver 15 can use the voltage of this sampling to adjust the power factor of input AC electricity, and the scope of decision operating voltage.
Fig. 7 shows the circuit configurations of the voltage adapter of a preferred embodiment of the present invention.Yet next we desire earlier with reference to Fig. 3 to Fig. 6 how the circuit configurations of being deduced out the voltage adapter of Fig. 7 by the circuit configurations of the known voltage adapter of Fig. 1 to be described, make those skilled in the art that scholar can understand creation spirit of the present invention and principle in view of the above, thereby realize circuit design benchmark of the present invention based on instruction around here.
See also Fig. 3, it is first kind of equivalent electric circuit of the voltage adapter of Fig. 1.Circuit configurations according to Fig. 3, between the positive half period of input ac voltage Vin, input current can flow through one first diode 22, be connected in the resistance R between the Electromagnetic interference filter 11 and first diode 22, and be connected in the resistance r between first diode 22, one second diode 24 and the earth terminal.Therefore between the positive half period of input ac voltage Vin, the amplitude of the resulting sampling input voltage of input power sensor detecting circuit just can be r * Vin/ (r+R), and its value be one on the occasion of.Same, between the negative half-cycle of input ac voltage Vin, input current can flow through second diode 24, be connected in the resistance R between the discharge resistance Rx and second diode 24, and be connected in the resistance r between first diode 22, second diode 24 and the earth terminal.Therefore between the negative half-cycle of input ac voltage Vin, the amplitude of the resulting sampling input voltage of input power sensor detecting circuit also can be r * Vin/ (r+R), and its value be one on the occasion of.Therefore according to the circuit configurations of Fig. 3, can produce profile as Fig. 2 (C) just input to the voltage waveform of the sampling input ac voltage of driver 15, and the circuit configurations of the voltage adapter of Fig. 3 just can be considered the equivalent electric circuit of the voltage adapter of Fig. 1.
See also Fig. 4, it is second kind of equivalent electric circuit of the voltage adapter of Fig. 1.Can know by Fig. 4 and to find out between the positive half period of input ac voltage Vin, input current can flow through first diode 22, be connected in the resistance 1/2R between the Electromagnetic interference filter 11 and first diode 22, be connected in the resistance 1/2R between first diode 22 and the driver 15, and be connected in the resistance r between driver 15 and the earth terminal.Because two resistance 1/2R connect mutually, its equivalent resistance is R, thus can be considered with Fig. 3 in be connected in the equivalent resistance that the resistance R between the Electromagnetic interference filter 11 and first diode 22 couples mutually.Therefore between the positive half period of input ac voltage Vin, the amplitude of resulting sampling input voltage also can be r * Vin/ (r+R), and its value be one on the occasion of.Same, between the negative half-cycle of input ac voltage Vin, input current can flow through second diode 24, be connected in the resistance 1/2R between the discharge resistance Rx and second diode 24, be connected in the resistance 1/2R between second diode 24 and the driver 15, and be connected in the resistance r between driver 15 and the earth terminal.Because two resistance 1/2R connect mutually, its equivalence value also is R.So can be considered and be connected in that resistance R between the discharge resistance Rx and second diode 24 couples mutually and resistance value is the equivalent resistance of r.Therefore between the negative half-cycle of input ac voltage Vin, the amplitude of resulting sampling input voltage also can be r * Vin/ (r+R), and its value be one on the occasion of.Therefore according to the circuit configurations of Fig. 4, the voltage waveform that inputs to the sampling input ac voltage of driver 15 just can produce the profile as Fig. 2 (C), just and the circuit configurations of the voltage adapter of Fig. 4 can be considered the equivalent electric circuit of the voltage adapter of Fig. 1 and Fig. 3.
See also Fig. 5, it is the third equivalent electric circuit of the voltage adapter of Fig. 1.In the voltage adapter of Fig. 5, two groups of R that first diode 22, second diode 24 are connected with earth terminal and 2r, through its equivalent electric circuit of back that is connected in parallel is 1/2R and r, so the power sensor detecting circuit configuration of Fig. 5 just can be considered and Fig. 1, Fig. 3 and the equivalent mutually circuit of Fig. 4.
See also Fig. 6, it is the 4th a kind of equivalent electric circuit of the voltage adapter of Fig. 1.Circuit configurations according to Fig. 6, between the positive half period of input ac voltage Vin, input current can flow through one first diode 22, be connected in the resistance 1/2R between the Electromagnetic interference filter 11 and first diode 22, and shunt in connecting the resistance R+2r between first diode 22, second diode 24 and the earth terminal and first diode 22 to the 1/2R+2r+1/2R between the Electromagnetic interference filter 11.By 1/2R+2r+1/2R and R+2r equivalent, so the wherein one group of R and the 2r equivalent that are connected with earth terminal of first diode 22 to its polyphone of the 1/2R+2r+1/2R between the Electromagnetic interference filter 11 result and first diode 22, second diode 24 among Fig. 5 as can be known.Between the negative half-cycle of input ac voltage Vin, input current can flow through second diode 24, be connected in the resistance 1/2R between the Electromagnetic interference filter 11 and second diode 24, and shunt in connecting the resistance R+2r between first diode 22, second diode 24 and the earth terminal and second diode 24 to the 1/2R+2r+1/2R between the Electromagnetic interference filter 11.By 1/2R+2r+1/2R and R+2r equivalent, so the wherein one group of R and the 2r equivalent that are connected with earth terminal of second diode 24 to its polyphone of the 1/2R+2r+1/2R between the Electromagnetic interference filter 11 result and first diode 22, second diode 24 among Fig. 5 as can be known.So the power sensor detecting circuit configuration of Fig. 6 just can be considered the equivalent electric circuit of Fig. 1, Fig. 3, Fig. 4 and Fig. 5.
The resistance 1/2R that we will be connected between the anode tap of the Electromagnetic interference filter 11 (input power filtering capacitor X-cap) and first diode 22 at this is called first resistance, the resistance 1/2R+2r that is connected between the anode tap of the anode tap of first diode 22 and second diode 24 is called second resistance, be called the 3rd resistance with being connected in the anode tap of second diode 24 and the resistance 1/2R between the Electromagnetic interference filter 11 (input power filtering capacitor X-cap), the cathode terminal of first diode 22 will be connected in, resistance R between the cathode terminal of second diode 24 and the driver 15 is called the 4th resistance, is called the 5th resistance with being connected in the resistance 2r of driver to earth terminal.
Next, in the circuit configurations of Fig. 6, because the discharge resistance Rx of three series connection is only as input power filtering capacitor X-cap is provided the usefulness of discharge path, it can combine with first resistance, second resistance and the 3rd resistance and reduce employed resistance number in the circuit, that is, three discharge resistance Rx can omit fully, become the discharge resistance that input power filtering capacitor X-cap is provided and replace with first resistance, second resistance and the formed circuit blocks of the 3rd resistance.And because 1/2R so can be approximated to 1/2R, via above-mentioned step, just can obtain the circuit configurations of the voltage adapter of preferred embodiment of the present invention shown in Figure 7 much larger than 2r in second resistance.
How above explanation has explained the equivalent electric circuit by row fully, and the circuit configurations of known voltage adapter are carried out assembly displacement and the program step that merges with the circuit configurations of deriving voltage adapter of the present invention.Therefore as can be seen from Figure 6, electric pressure converter of the present invention provides and has reduced when operating under standby mode because the caused electrical source consumption of power loss of resistance, and electric pressure converter of the present invention is characterised in that to have a circuit box (circuit box), this circuit box can provide a discharge path to give this Electromagnetic interference filter, simultaneously this input voltage is taken a sample so that detect the variation of this input voltage.Know clearly it, the composition of this circuit box includes one first resistance 1/2R, and have one first end and be connected to this Electromagnetic interference filter 11, and one second end; One second resistance 1/2R has second end that one first end is connected to this first resistance 1/2R, and one second end; One the 3rd resistance 1/2R has second end that one first end is connected to this second resistance 1/2R, and one second end is connected to this Electromagnetic interference filter 11; One first diode 22 has one first end and is connected to first end of this second resistance 1/2R and second end of this first resistance 1/2R, and one second end; One second diode 24, have one first end and be connected to first end of the 3rd resistance 1/2R and second end of this second resistance 1/2R, and one second end, and one the 4th resistance R, have one first end and be connected to second end of this first diode 22 and second end of this second diode 24, and one second end is connected to driver 15; And one the 5th resistance 2r, have second end that one first end is connected to the 4th resistance R, and one second end is connected to earth terminal.Compare as can be known with the known voltage adapter of first figure, causing the power loss when holding state is operated in voltage adapter of the present invention inside is Vin
2/ (1/2R+1/2R+r), be Vin yet cause the power loss when holding state is operated in the known voltage adapter inside
2/ (3RX)+Vin
2/ (R+r).Because resistance 1/2R+1/2R+r must equal the resistance value of 3RX, so this circuit will be saved Vin
2/ (R+r) stand-by power consumption.So by the caused power loss of resistance, and can further save inner electrical source consumption when the present invention can significantly improve under holding state operation really.
But with apprehensible be the above embodiments changes, and do not break away from its broad inventive concept.Therefore, the present invention is restricted in the specific embodiments that is disclosed, and desires to comprise the spirit of the present invention that defined by appended claim and all modifications in the scope.
Claims (8)
1. a power sensor detecting circuit of saving standby power also converts this input voltage to have with the different voltage levels of this input voltage a output voltage in order to receive an input voltage, and it comprises:
One Electromagnetic interference filter is in order to eliminate the differential mode noise of this input voltage;
One bridge rectifier is connected to this Electromagnetic interference filter, in order to this input voltage is carried out full-wave rectification;
One transistor switch is connected to this bridge rectifier;
One driver is connected to this transistor switch, is worth the on/off operation that drives this transistor switch in order to the back coupling according to this output voltage; And
One sampling and circuit for detecting is connected to this Electromagnetic interference filter, this bridge rectifier and this driver, gives this Electromagnetic interference filter in order to a discharge path to be provided, and simultaneously this input voltage taken a sample so that detect the variation of this input voltage.
2. power sensor detecting circuit as claimed in claim 1 is characterized in that this power sensor detecting circuit is a kind of ac/dc adapter.
3. power sensor detecting circuit as claimed in claim 1 is characterized in that this Electromagnetic interference filter comprises at least one input power filtering capacitor.
4. power sensor detecting circuit as claimed in claim 1 is characterized in that this bridge rectifier is made up of several diodes.
5. power sensor detecting circuit as claimed in claim 1 is characterized in that also comprising an energy storage component, is connected between this bridge rectifier and this transistor switch, and its on/off operation according to this transistor switch transmits a direct current voltage.
6. power sensor detecting circuit as claimed in claim 5 is characterized in that also comprising an output filter, is connected to this energy storage component, and in order to this output voltage is carried out filtering, and this output filter comprises a diode and an electric capacity.
7. power sensor detecting circuit as claimed in claim 1 is characterized in that this sampling and circuit for detecting comprise:
One first resistance has one first end and is connected to this Electromagnetic interference filter, and one second end;
One second resistance has second end that one first end is connected to this first resistance, and one second end;
One the 3rd resistance has second end that one first end is connected to this second resistance, and one second end is connected to this Electromagnetic interference filter;
One first diode has one first end and is connected to first end of this second resistance and second end of this first resistance, and one second end;
One second diode has one first end and is connected to first end of the 3rd resistance and second end of this second resistance, and one second end;
One the 4th resistance has one first end and be connected to second end of this first diode and second end of this second diode, and one second end is connected to this driver; And
One the 5th resistance has second end that one first end is connected to the 4th resistance, and one second end is connected to an earth terminal.
8. power sensor detecting circuit as claimed in claim 7, wherein first end of this first diode and second end are respectively anode and negative electrode, first end of this second diode and and second end be respectively anode and negative electrode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100458285A CN100438300C (en) | 2004-05-20 | 2004-05-20 | Power supply detecting cirucit with power-saving under ready condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100458285A CN100438300C (en) | 2004-05-20 | 2004-05-20 | Power supply detecting cirucit with power-saving under ready condition |
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| CN1581663A CN1581663A (en) | 2005-02-16 |
| CN100438300C true CN100438300C (en) | 2008-11-26 |
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| CNB2004100458285A Expired - Fee Related CN100438300C (en) | 2004-05-20 | 2004-05-20 | Power supply detecting cirucit with power-saving under ready condition |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458463C (en) * | 2005-10-19 | 2009-02-04 | 台达电子工业股份有限公司 | High-voltage detecting circuit for saving power consumption on stand-by state |
| CN102377358B (en) * | 2010-08-23 | 2014-09-10 | 昂宝电子（上海）有限公司 | System and method for reducing standby power consumption of power converter with switching mode |
| US9374019B2 (en) | 2010-09-28 | 2016-06-21 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for discharging an AC input capacitor with automatic detection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000166239A (en) * | 1998-11-27 | 2000-06-16 | Matsushita Electric Ind Co Ltd | Variable voltage converter and air conditioner using the converter |
| JP2003204676A (en) * | 2002-01-09 | 2003-07-18 | Internatl Business Mach Corp <Ibm> | Ac-dc adaptor, and apparatus connected to the adaptor |
-
2004
- 2004-05-20 CN CNB2004100458285A patent/CN100438300C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000166239A (en) * | 1998-11-27 | 2000-06-16 | Matsushita Electric Ind Co Ltd | Variable voltage converter and air conditioner using the converter |
| JP2003204676A (en) * | 2002-01-09 | 2003-07-18 | Internatl Business Mach Corp <Ibm> | Ac-dc adaptor, and apparatus connected to the adaptor |
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| CN1581663A (en) | 2005-02-16 |
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Assignee: In reach electronics (Jiangsu) Co., Ltd Assignor: Delta Optoelectronics Inc. Contract fulfillment period: 2008.1.1 to 2013.12.31 Contract record no.: 2009990000379 Denomination of invention: Power supply detecting cirucit with power-saving under ready condition Granted publication date: 20081126 License type: Exclusive license Record date: 2009.4.28 |
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