CN1487644A - Electric power device and electronic parts - Google Patents
Electric power device and electronic parts Download PDFInfo
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- CN1487644A CN1487644A CNA031374549A CN03137454A CN1487644A CN 1487644 A CN1487644 A CN 1487644A CN A031374549 A CNA031374549 A CN A031374549A CN 03137454 A CN03137454 A CN 03137454A CN 1487644 A CN1487644 A CN 1487644A
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Abstract
To reduce power consumption as the entire device, especially that under no load, with a power supply along with an electronic component, in which an output voltage is kept constant by controlling oscillation waveform according to a load. There are provided a transformer, a detecting means which detects an output voltage outputted from a secondary coil side of the transformer and generates a detection signal, transmission means which transmit the detection signal generated by the detecting means to a primary coil side of the transformer, and control means that control a voltage applied to the primary coil side of the transformer based on the output signal of the transmission means. The transmission coefficient of detection signal is so set in the transmission means that the output signal is kept within a signal range required for the control means and that the signal range of the detection signal is requisite minimum.
Description
Technical field
The present invention relates to a kind of supply unit and electronic unit, particularly control vibrational waveform to keep certain supply unit and the electronic unit of output voltage with load.
Background technology
Fig. 3 illustrates the circuit structure diagram of existing supply unit one example.
Existing supply unit 1 constitutes the switching regulator of RCC (Ringing Choke Converter) mode.
It is made up of bridge diode circuit 11, smoothing circuit 12, transformer 13, control circuit 14, rectifier smoothing circuit 15, testing circuit portion 16, optical coupler 17, switch triode Q1.
Input ac voltage/electric current is supplied to bridge diode circuit 11 via R1.11 pairs of input ac voltage/electric currents of bridge diode circuit carry out rectification.Voltage/current by 11 rectifications of bridge diode circuit is supplied to smoothing circuit 12.Smoothing circuit 12 is made up of choke L1, smoothing capacitor C1, C2, smoothly by the voltage/current of bridge diode circuit 11 rectifications.
Smoothed voltage/current also is supplied to control circuit 14 via resistance R 2 when being supplied to transformer 13 via resistance R 1.Transformer 13 contains primary coil L11, secondary coil L12 and ancillary coil L13.
Be applied in switch correspondent voltage on the primary coil L11 with switch triode Q1.On secondary coil L12, then produce and the electric current correspondent voltage that flows through primary coil L11.Secondary coil L12 is connected with rectifier smoothing circuit 15.Rectifier smoothing circuit 15 is made up of diode D11, D12 and capacitor C11, C12 and choke L2, and its is supply with lead-out terminal Tout after the alternating current rectification smoothing that produces on the secondary coil L12.
Control circuit 14 is made up of resistance R 2～R5, capacitor C3～C5, diode D1 and triode Q2, forms so-called auto-excitation type intermittent oscillation circuit, makes switch triode Q1 carry out switch.Control circuit 14 is connected with ancillary coil L13, carries out self-oscillation by the electric current from ancillary coil L13.In addition, the Control current Ic by optical coupler 17 outputs is supplied to control circuit 14.The Control current Ic of control circuit 14 corresponding optical coupler 17 outputs carries out intermittent oscillation.When Control current Ic becomes big, just elongated during the switch triode Q1 disconnection, when Control current Ic diminishes, just shorten during the switch triode Q1 connection.
In addition, control circuit 14 will pass through from the electric current of ancillary coil L13 to supply with optical coupler 17 after diode D1 and capacitor C5 rectification, the smoothing.Optical coupler 17 is made up of photodiode Dp and phototriode Qp, controls the emitter current of phototriode Qp according to the luminous quantity of photodiode Dp.Be supplied to the collector electrode of phototriode Qp by the electric current after the diode D1 of control circuit 14 and capacitor C5 rectification, the smoothing.The luminous quantitative change of photodiode Dp for a long time, the emitter current of phototriode Qp just increases, when the luminous quantity of photodiode Dp tailed off, the emitter current of phototriode Qp just reduced.The emitter current of phototriode Qp is as the Control current Ic of control circuit 14 and be supplied to control circuit 14.
In addition, supply with detection electric current I f from testing circuit 16 to photodiode Dp.Photodiode Dp, if come the detection electric current I f of self-detection circuit 16 big, it is big that its luminous quantity just becomes, if come the detection electric current I f of self-detection circuit 16 little, its luminous quantity just diminishes.
Here, the transfer ratio of setting optical coupler 17 is that the electric current that flows through among CTR, the photodiode Dp is If, flows to the Control current of control circuit 14, and promptly the collector current of phototriode Qp is Ic, and then Ic can be expressed as
Ic＝If×CTR。(1)
Therefore, according to formula (1), the detection electric current I f that flows through among the photodiode Dp just can be expressed as
If＝Ic/CTR。(2)
Yet, in supply units such as existing AC adapter, wish to reduce the current sinking of device integral body, particularly reduce the current sinking when non-loaded.But, in AC adapter shown in Figure 3, when non-loaded, can produce loss, transformer efficiency loss, the photodiode loss of optical coupler 17, the loss of testing circuit 16 of coiling load such as starting resistance, transformer 13, switch triode Q10 etc.
The transmission efficiency of optical coupler 17 is poor, and transfer rate CTR is low.Therefore, the fixed Control current Ic in order to obtain just need make and detect electric current I f and become big.Become big owing to detect electric current I f, cause the current drain of the secondary coil L12 side of transformer 13 to become big.Especially, in the secondary coil L12 of transformer 13 side, owing to need the conversion efficiency of transformer 13, compare with the current sinking of the primary coil L11 side of transformer 13, it is big that its current sinking just becomes.
Summary of the invention
The present invention is in view of above each point, and so that a kind of consumption electric power that can reduce device integral body to be provided, the supply unit of the current sinking when particularly non-loaded and electronic unit are its purpose.
The invention is characterized in, have: transformer (13), detection is from the output voltage of the secondary coil (L12) of transformer (13) output and produce the checkout gear (16) of detection signal, the detection signal that checkout gear (16) is produced is sent to the conveyer (17 of the primary side of transformer (13), 101), and the control device (14 of controlling the applied voltage of primary coil (L11) side that is applied to transformer (13) based on the output signal of conveyer (17), Q1), conveyer (17,101) make output signal maintain control device (14, Q1) in the required range of signal, and set the transfer ratio of detection signal, make the range of signal of detection signal become required Min..
In addition, feature of the present invention also is, conveyer (17,101) has: by according to detection signal and luminous photodiode (Dp) and output constitute with the optical coupler of being formed from the phototriode (Qp) of the electric current of the photophase of photodiode (Dp) (17), with the phototriode (Qp) of formation optical coupler (17) that Darlington is connected and provide the triode (Q10) of electric current to control device (14, Q1), transfer ratio is regulated by the current amplification degree of above-mentioned Darlington connection.
Have, feature of the present invention also is, is connected with resistance (R10) between the base-emitter of triode (Q10) again.
In addition, feature of the present invention also is, optical coupler (17) and triode (Q10) are by integrated and constitute single part.
According to the present invention, detecting from the output voltage of secondary coil (L12) the side output of transformer (13), and the detection signal that will be produced by the checkout gear (16) of generation detection signal, by conveyer (17,101) be sent to the control device (14 that the applied voltage of primary coil (L11) side that puts on transformer (13) is controlled, Q1) in a kind of like this structure, by conveyer (17,101) make output signal maintain control device (14, Q1) in the required range of signal, and, make the range of signal of detection signal become required Min. by the transfer ratio of setting detection signal, owing to can be reduced to minimum to current sinking, especially can reduce the current sinking when non-loaded, thereby reduce the consumption electric power of device integral body, particularly can significantly reduce the current sinking when non-loaded.
Also have, reference symbol only is an example, is not limited thereto.
Description of drawings
Fig. 1 is the circuit structure diagram of an embodiment of supply unit of the present invention.
Fig. 2 is the performance plot with respect to the Control current Ic that detects electric current I f.
Fig. 3 is the circuit structure diagram of an example of existing supply unit.
Embodiment
Shown in Figure 1 is the circuit structure diagram of an embodiment of supply unit of the present invention.In the figure, the structure division mark prosign identical with Fig. 3 omits its explanation.
The supply unit 100 of present embodiment is provided with current amplification circuit 101 between optical coupler and intermittent oscillation circuit.
Triode Q10 is made of NPN type triode.The voltage that rectifier smoothing circuit produced that is made of diode D1 and capacitor C5 is applied to the collector electrode of triode Q10.Resistance R 10 is connected between the base-emitter of triode Q10.By resistance R 10 linearity in the little current range of current amplification circuit 101 is improved.
The emitter current of phototriode Qp is amplified according to current amplification degree hfe.Driving power voltage from rectifier smoothing circuit is supplied to collector electrode, and its emitter is connected with the base stage of triode Q1 via resistance.
Here, the emitter current of setting triode Q10 is Ic, and the current amplification degree of triode Q10 is hfe, and then the current amplification degree after optical coupler 17 and the triode Q10 combination just is expressed as
(CRT×hfe)。
Like this, the emitter current Ic of triode Q10 just is expressed as
Ic＝If×(CRT×hfe)。(3)
Therefore, the electric current I f that is flow through among the photodiode Dp just is expressed as
If＝Ic/(CRT×hfe)。(4)
After the output current Ic of the existing optical coupler 17 shown in formula (4) and the formula (2) compared, electric current I f can be that ratio reduces with the current amplification degree hfe of triode Q10.By electric current I f is reduced, just can significantly reduce the current sinking of the secondary coil L12 side of transformer 17.
For example, when the alternating voltage of importing is under the situation of 100V, can reduce the consumption electric power of 10mW.
Fig. 2 illustrates the performance plot with respect to the Control current Ic that detects electric current I f.In Fig. 2, dotted line is represented existing characteristic, and solid line is represented characteristic of the present invention.
By as present embodiment, making current amplification degree become (CRT * hfe), in Fig. 2 with shown in the solid line like that with respect to the characteristic of the Control current Ic that detects electric current I f, only compare with the such current amplification degree of situation in the past shown in dotted lines in Figure 2, move to the arrow A direction for the occasion of CRT.
By moving to the direction of arrow A with respect to the Control current Ic characteristic that detects electric current I f, be used to obtain the required detection current range Δ If of fixed Control current range delta Ic to the arrow directions X, promptly the direction that diminishes to current value moves.Therefore, the current sinking in secondary coil L12 side is diminished.
Have again, current amplification circuit 111 also can with optical coupler 17 becoming one, provide as parts.
In addition, in the present embodiment,, also can reduce current sinking by the conversion efficiency that improves optical coupler 17 though between optical coupler 17 and control circuit 14, be provided with current amplification circuit.
In addition, in the present embodiment, for example understand to be the so-called AC adapter of dc voltage as supply unit with the AC voltage transitions, but the present invention is not limited to this, can be applicable at least to have transformer, detect from the output voltage of the second coil side output of transformer and produce the checkout gear of detection signal, the detection signal that checkout gear produced be sent to the conveyer of primary side of transformer and the supply unit of control device of applied voltage that is applied to the primary side of transformer based on the output signal control of conveyer.
As mentioned above, has such advantage according to the present invention: by regulating the transmission of conveyer Coefficient makes current sinking be reduced to Min., especially, owing to can reduce disappearing when non-loaded Power consumption stream, thus the power consumption that can reduce device integral body had, particularly can significantly reduce Current sinking when non-loaded etc.
Claims (6)
1. supply unit, it is characterized in that, it has: transformer, detection is from the output voltage of the second coil side of transformer output and produce the checkout gear of detection signal, the aforementioned detection signal that aforementioned checkout gear produced is sent to the conveyer of the primary side of aforementioned transformer, and the control device that is applied to the applied voltage of aforementioned transformer side based on the output signal control of aforementioned conveyer, aforementioned conveyer maintains in the required range of signal of aforementioned control device aforementioned output signal, and set the transfer ratio of aforementioned detection signal, make the range of signal of aforementioned detection signal become required Min..
2. supply unit as claimed in claim 1, it is characterized in that, above-mentioned conveyer has: comprise according to above-mentioned detection signal and luminous photodiode and output with constituting from the optical coupler of the phototriode of the electric current of the photophase of above-mentioned photodiode and with the phototriode that constitutes above-mentioned optical coupler that Darlington is connected and providing the triode of electric current to above-mentioned control device, above-mentioned transfer ratio is regulated by the current amplification degree of above-mentioned Darlington connection.
3. supply unit as claimed in claim 2 is characterized in that, is connected with resistance between the base-emitter of above-mentioned triode.
4. supply unit as claimed in claim 2 is characterized in that, above-mentioned optical coupler and above-mentioned triode are by integrated and constitute single part.
5. electronic unit, it is characterized in that, optical coupler and triode is integrated and constitute single part, described optical coupler contains with good grounds input signal and luminous photodiode and output and phototriode from the electric current of the photophase of above-mentioned photodiode, and described triode constitutes with the phototriode that constitutes above-mentioned optical coupler that Darlington connects and the output output current.
6. electronic unit as claimed in claim 5 is characterized in that, is connected with resistance between the base-emitter of above-mentioned triode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002287207 | 2002-09-30 | ||
| JP2002287207A JP2004129340A (en) | 2002-09-30 | 2002-09-30 | Power supply and electronic component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1487644A true CN1487644A (en) | 2004-04-07 |
| CN100477441C CN100477441C (en) | 2009-04-08 |
Family
ID=32280080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031374549A Expired - Fee Related CN100477441C (en) | 2002-09-30 | 2003-06-20 | Electric power device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004129340A (en) |
| CN (1) | CN100477441C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450074A (en) * | 2015-11-01 | 2016-03-30 | 四川泛华航空仪表电器有限公司 | Self-excited transistor inverter |
| CN107710577A (en) * | 2015-07-03 | 2018-02-16 | 飞利浦照明控股有限公司 | Power converter and the LED illumination circuit for including it |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5042536B2 (en) * | 2006-06-16 | 2012-10-03 | ローム株式会社 | POWER SUPPLY DEVICE AND ELECTRIC DEVICE HAVING THE SAME |
| JP5601030B2 (en) * | 2010-05-27 | 2014-10-08 | 横河電機株式会社 | Constant voltage output device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01117656A (en) * | 1987-10-29 | 1989-05-10 | Fanuc Ltd | Switching regulator |
| JP2596957B2 (en) * | 1988-01-08 | 1997-04-02 | シャープ株式会社 | Optical coupling device |
-
2002
- 2002-09-30 JP JP2002287207A patent/JP2004129340A/en active Pending
-
2003
- 2003-06-20 CN CNB031374549A patent/CN100477441C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107710577A (en) * | 2015-07-03 | 2018-02-16 | 飞利浦照明控股有限公司 | Power converter and the LED illumination circuit for including it |
| CN105450074A (en) * | 2015-11-01 | 2016-03-30 | 四川泛华航空仪表电器有限公司 | Self-excited transistor inverter |
| CN105450074B (en) * | 2015-11-01 | 2019-05-28 | 四川泛华航空仪表电器有限公司 | Auto-excitation type transistor inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004129340A (en) | 2004-04-22 |
| CN100477441C (en) | 2009-04-08 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090408 Termination date: 20100620 |