CN101615852A - Continuous-current plant - Google Patents
Continuous-current plant Download PDFInfo
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- CN101615852A CN101615852A CN200910150847A CN200910150847A CN101615852A CN 101615852 A CN101615852 A CN 101615852A CN 200910150847 A CN200910150847 A CN 200910150847A CN 200910150847 A CN200910150847 A CN 200910150847A CN 101615852 A CN101615852 A CN 101615852A
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Abstract
The invention provides under a kind of situation about connecting again after temporarily losing input voltage, the continuous-current plant that misoperation, system can normally start can not take place with IC in control yet.This continuous-current plant possesses: the voltage transformation transformer (T1) with ancillary coil; Control the control circuit (12) of electric current of the first siding ring of this transformer; Having the exchange conversion of will induct in the ancillary coil is the rectification unit of direct current and the rectification circuit of filtering capacitor (D3), described control circuit, the voltage that generates by described rectification circuit can be come work as supply voltage, in described continuous-current plant, be provided with voltage and reduce unit (R3, R4, Q2), when the input voltage (Vin) of the first siding ring of transformer becomes lower than predetermined potential, discharge the electric charge of the filtering capacitor of described rectification circuit, the voltage that offers described control circuit is reduced.
Description
Technical field
The present invention relates to possess the startup stabilization technology of voltage transformation, relate to and for example be effective to the technology in the employed primary side control circuit in the such supply unit of AC adapter with the insulated type continuous-current plant of transformer.
Background technology
The AC adapter is by the diode bridge circuit that AC power is carried out rectification with the direct voltage that gets by this circuit rectification is carried out decompression transformation is that the DC-DC converter etc. of wishing the direct voltage of current potential constitutes.As this DC-DC converter, for example used and controlled by the electric current that flows through in the first siding ring of voltage transformation with transformer being carried out switch, control the switching power unit of the voltage of inducting in the second siding ring.
The AC adapter is advancing miniaturization and cost degradation, so the reduction of element number is very important.Therefore, having developed control makes electric current flow through the control IC of the switching transistor of first siding ring.IC use in the control of existing switch, and being used for output voltage with the secondary coil side, to feed back to optical coupler or the outward elements such as capacitor, resistance of control usefulness IC many.
Therefore, proposed the invention of relevant following such supply unit: this supply unit is provided with ancillary coil at voltage transformation in transformer, and according to the voltage of inducting in this ancillary coil, control makes electric current flow through the switching transistor of first siding ring.As this invention, invention disclosed in patent documentation 1 or the patent documentation 2 is arranged.
In the AC adapter, need Japan with AC100V, be the function of tens V or the direct voltage below the 10V with the AC voltage transformation about 200V in overseas.As mentioned above, have primary side control with in the AC adapter of IC, IC's is withstand voltage more much lower than input voltage.Therefore, in patent documentation 1, in the invention disclosed, the primary side input voltage is carried out step-down, offer control IC as supply voltage then by resistance.
But, by resistance the primary side input voltage is being carried out step-down, when offering primary side control and use IC as supply voltage then, the puzzlement of spread of voltage is arranged.Therefore, constitute supply unit as shown in Figure 4, ancillary coil Nb is set at voltage transformation in transformer T1, is direct current by diode D3 with the exchange conversion of inducting in this ancillary coil, carry out filtering by capacitor C3, filtered voltage Vb is offered primary side control use IC12 as supply voltage, control the switching transistor Q1 that makes electric current flow through first siding ring.And following technology is studied: when starting, will offer primary side control IC by the voltage after resistance R 1 step-down, make switching transistor Q1 action, make electric current flow through first siding ring Np, after in ancillary coil Nb, generating voltage, do not use input voltage and, primary side control is worked with IC by the direct voltage Vb that the ac voltage rectifier of will induct in the ancillary coil gets.
Its result, obviously, when after the plug of AC adapter is extracted from socket, connecting again immediately, primary side control sometimes IC misoperation, the undesired startup of system.This is because the control of the primary side of AC adapter is designed in the operate as normal when 0V rises of input voltage under the initial condition with IC, and as mentioned above, when connecting again immediately after plug extracted from socket, voltage has just been come in before control fully descends with the current potential of the node in the somewhere (perhaps being the power supply switching part) of IC inside, so supply voltage is imported node and do not switched to the primary side input voltage from the induced potential of ancillary coil.
[patent documentation 1] spy opens flat 5-130773 communique
[patent documentation 2] spy opens flat 8-126307 communique
Summary of the invention
The present invention is conceived to the problems referred to above and proposes, and its purpose is, a kind of continuous-current plant is provided, and it is under situation about connecting again behind the temporarily disconnected input voltage, and control with IC misoperation does not take place yet, and system can normally start.
In order to reach above-mentioned purpose, the invention provides a kind of continuous-current plant, it possesses: have the transformer that the voltage transformation of ancillary coil is used; Control the control circuit of electric current of the first siding ring of this transformer; Having the exchange conversion of inducting in the described ancillary coil is the rectification unit of direct current and the rectification circuit of filtering capacitor, described control circuit can be worked the voltage that generates by described rectification circuit as supply voltage, in this continuous-current plant, possess voltage and reduce the unit, when its input voltage when the first siding ring of described transformer becomes lower than predetermined current potential, discharge the electric charge of the filtering capacitor of described rectification circuit, the voltage that offers described control circuit is reduced.
According to above-mentioned means, when input voltage descends, voltage reduces the electric charge that the unit discharges the filtering capacitor of rectification circuit, the voltage that offers described control circuit is descended rapidly, therefore, the current potential of the node of internal circuit also descends, and can prevent control circuit erroneous action when input voltage rises once more.
At this, it is desirable to, described voltage reduces the unit, have at resistance that the dividing potential drop that is connected in series between terminal that applies described input voltage and the reference potential point is used and the 3 terminal switch elements that between the connected node of described rectification unit and described filtering capacitor and reference potential point, are connected, on the control terminal of this 3 terminal switch element, applied the voltage of the voltage that depends on that the electric resistance partial pressure used by described dividing potential drop generates.Thus, when input voltage decline certain voltage was above, 3 terminal switch element conductings can discharge the electric charge of the filtering capacitor of rectification circuit, and the voltage that offers described control circuit is descended rapidly.
And, it is desirable to, described 3 terminal switch elements are bipolar transistors, on the base terminal of this bipolar transistor, have applied the voltage of the electric resistance partial pressure generation of using by described dividing potential drop with element via withstand voltage protection.Thus, reducing the electric current that flows through in the resistance that dividing potential drop is used when, input voltage has descended under the above situation of certain voltage, can discharge the electric charge of the filtering capacitor of rectification circuit, and the voltage that offers described control circuit descended rapidly.
In addition, it is desirable to, described voltage reduces the unit, is made of resistance of using in the dividing potential drop that is connected in series between terminal that is applied in described input voltage and the reference potential point and the 2 terminal switch elements that are connected between the connected node of the resistance that described rectification unit and the connected node and the described dividing potential drop of described filtering capacitor are used.Thus, constitute voltage decline unit, under input voltage has descended the situation more than the certain voltage, can discharge the electric charge of the filtering capacitor of rectification circuit, the voltage that offers described control circuit is descended rapidly by the element that appends lesser amt.
And, it is desirable to, described control circuit, by make electric current flow through off and on described transformer first siding ring switch element and the switch driven control circuit is connected, disconnected to this switch element constitute.Thus, by driving switch elements such as PWM controls, can improve voltage transformation efficient thus.
In addition, it is desirable to, on 1 semiconductor chip, formed described switch element and described ON-OFF control circuit as semiconductor integrated circuit.Thus, can reduce the parts number of primary side circuit, with equipment miniaturization.
According to the present invention, have can be implemented in and temporarily lose under the situation about connecting again behind the input voltage, the effect of the continuous-current plant that misoperation, system can normally start can not take place in control yet with IC.
Description of drawings
Fig. 1 is the circuit structure diagram of the AC adapter of expression the 1st execution mode of the present invention.
Fig. 2 is the circuit structure diagram of the AC adapter of expression the 2nd execution mode of the present invention.
Fig. 3 is the circuit structure diagram of variation of the AC adapter of expression the 1st execution mode.
Fig. 4 is the circuit structure diagram of an example of the expression existing AC adapter that has been equipped with the transformer that voltage transformation with ancillary coil uses.
Symbol description
The 10AC adapter
11 diode bridge circuits
12 ON-OFF control circuit (primary side control IC)
13 overvoltage detection circuits
14 optical couplers
15 overcurrent sensing circuits
The T1 transformer
The Q1 switching transistor
The Q2 electric charge discharges the transistor (3 terminal switch element) of usefulness
The resistance that R3, R4 dividing potential drop are used
D2, D3 rectification diode
The withstand voltage protecting diode of D4
D4 ' electric charge discharges the diode (2 terminal switch element) of usefulness
Embodiment
Below, preferred implementation of the present invention is described with reference to the accompanying drawings.In addition, below, the example as using continuous-current plant of the present invention has effectively illustrated the example that is applied to the AC adapter, is not limited thereto but can use continuous-current plant of the present invention.
＜execution mode 1 〉
Fig. 1 is the circuit structure diagram of the AC adapter of expression the 1st execution mode of the present invention.
The AC adapter 10 of this execution mode has: (AC) carries out rectification to alternating voltage, is transformed to the diode bridge circuit 11 and the capacitor for filter C1 of direct voltage; Has the transformer T1 that the voltage transformation of first siding ring Np and ancillary coil Nb and second siding ring Ns is used; The switching transistor Q1 that is connected in series with the first siding ring Np of this transformer T1; Q1 carries out switch driven control circuit 12 to this switching transistor.In this embodiment, on 1 such semiconductor chip of monocrystalline silicon, formed ON-OFF control circuit 12 as semiconductor integrated circuit (hereinafter referred to as control IC).
Secondary side at above-mentioned transformer T1, be provided with: the rectification that is connected in series with second siding ring Ns is with diode D2, the capacitor for filter C2 that is connected between the another terminal of the cathode terminal of this diode D2 and second siding ring Ns, the alternating current of inducting by flowing through electric current on first siding ring Np discontinuous ground is carried out rectifying and wave-filtering, thus the output direct voltage Vout corresponding with the turn ratio of first siding ring Np and second siding ring Ns in second siding ring Ns.
In addition, the AC adapter 10 of this execution mode has at primary side: the rectification that is connected in series with above-mentioned ancillary coil Nb is with diode D3 and the capacitor for filter C3 that is connected between the another terminal of the cathode terminal of this diode D3 and ancillary coil Nb, and filtered voltage Vb is applied in above-mentioned control with on the predetermined terminal of IC12.Meanwhile, via resistance R 1 input voltage vin is applied to control with on the another terminal of IC12.The capacitance of capacitor for filter C3 is made as about 150 μ F.
With in the IC12, though the not shown voltage commutation circuit that is provided with, it offers internal circuit with the filtering voltage Vb or the input voltage vin of above-mentioned ancillary coil side as supply voltage in control.Voltage commutation circuit, power supply rigidly connect after logical, ancillary coil Nb also can't supply with starting stage of enough electric power, for internal circuit can be worked input voltage vin is supplied with as supply voltage; Make switching transistor Q1 action in control with IC12, in first siding ring, flow through electric current, in ancillary coil Nb behind the induced potential, do not use input voltage and make the internal circuit work of control with IC12 by the alternating voltage of inducting among the ancillary coil Nb being carried out the voltage that rectification gets.
And control possesses with IC12: the filtering voltage Vb to above-mentioned ancillary coil side samples, the error amplifying circuit that itself and the potential difference of predetermined reference voltage are amplified; The comparators that the output that produces the output of oscillator of waveform signal (triangular wave) of preset frequency and above-mentioned error amplifying circuit is compared etc. for example generate and export in the PWM mode above-mentioned switching transistor Q1 is carried out the control impuls of conducting by control.
And, in the AC of this execution mode adapter 10, be provided with: the pnp bipolar transistor Q2 that on the connected node N3 of above-mentioned diode D3 and filtering capacitor C3, has been connected emitter, collector electrode has been connected with the earth GND via resistance R 2; Resistance R 3, R4 that the dividing potential drop that is connected in series between the output node N1 of diode bridge 11 and the earth GND is used.In addition, the AC adapter 10 of this execution mode on the connected node N2 of resistance R 3, R4, has connected the base terminal of above-mentioned transistor Q2 via the diode D4 of reverse connection.This diode D4 is as working for the withstand voltage protection component of not protecting applying the voltage more than withstand voltage on the base terminal of transistor Q2.
In addition, in the execution mode of Fig. 1, as with control with IC12 element independently, illustrate the switching transistor Q1 that makes electric current flow through first siding ring, but this transistor Q1 also can be assembled in control with in the IC12.
The effect of above-mentioned transistor Q2 then, is described.
The AC adapter of this execution mode, set the turn ratio of primary winding Np and ancillary coil Nb for make above-mentioned ancillary coil filtering voltage Vb and reached for example such voltage of 24V, and with the resistance ratio of resistance R 3 and R4 set for the current potential V2 of stable state lower node N2 reach than Vb (=24V) about high slightly 30V.In addition, in order to reduce the current sinking of the primary side circuit under the stable state, with the resistance value decision of resistance R 3 and R4 for totally reaching a few M Ω.
When the plug of pulling up the AC adapter, input voltage vin descends, and the current potential V2 of node N2 reaches Vb-2Vf when following (Vf is the forward voltage of PN junction), and transistor Q2 is switched on, the electric charge of filtering capacitor C3 discharges to the earth GND by Q2 and resistance R 2, makes that thus Vb descends rapidly.Particularly, reduce Vb, the resistance value of resistance R 2 is got into about 800 Ω for making the collector current that flows through among the Q2 about 300mA.
By resistance R 2～R4 is made as value as described above, the AC adapter of this execution mode, under input voltage vin reaches high-tension situation more than the 180V, meaningless current sinking in the time of also suppressing to stablize, and when input voltage turn-offs, can promptly reduce the supply voltage (Vb) of control with IC12.And if control uses the supply voltage of IC12 to descend, then the current potential of the node of internal circuit also descends, and therefore, can prevent control IC12 misoperation when power supply is connected again.
＜execution mode 2 〉
Transistor Q2 and emitter resistance R2 thereof that this execution mode has omitted the electric charge release usefulness in the 1st execution mode only establish diode D4 ', when input voltage vin descends, by diode D4 ' electric charge of filtering capacitor C3 are discharged to the earth GND, reduce Vb.In this embodiment, diode D4 ' does not come work with element as 2 terminal switch elements as withstand voltage protection.
Under above-mentioned such situation about constituting, when the resistance value of resistance R 3, R4 is identical with the 1st execution mode, the decline of the voltage Vb of filtering capacitor C3 is slack-off, but when the permissible value of the electric current that flows through in resistance R 3, R4 is big or fall time of voltage Vb when not too strict, can reduce the resistance value of R4, as present embodiment, discharge the electric charge of filtering capacitor C3, reduce the current potential Vb of node N3 by diode D4 '.
In addition, in the 2nd execution mode, between lead-out terminal, connect series resistance R5, the R6 that dividing potential drop is used, and the overvoltage detection circuit 13 that detects secondary side voltage is set, when detecting the overvoltage of output, stop based on the driving of control with the switching transistor Q1 of IC12 by this overvoltage detection circuit 13.The supply unit of this execution mode has been to use the insulated type of transformer, promptly the reference potential of primary side and secondary side is separated, and therefore controls via optical coupler PC input primary side from the signal of above-mentioned overvoltage detection circuit 13 and uses IC12.
The variation of the AC adapter of expression the 1st execution mode in Fig. 3.This variation and the 2nd execution mode similarly are provided with overvoltage detection circuit 13, and the resistance R sns that current detecting is used is set in the way of an output line, the overcurrent sensing circuit 15 that detects output current according to the voltage between terminals of this resistance R sns is set, under the situation of the overcurrent that detects output, also stop based on the driving of primary side control with the switching transistor Q1 of IC12.
In addition, in this variation, the logic of the output by having got voltage detecting circuit 13 and the output of overcurrent sensing circuit 15 and, offer optical coupler PC then, shared 1 optical coupler PC.In addition, be not limited to mode shown in Figure 3, can carry out various changes based on the voltage detecting of overvoltage detection circuit 13 or based on the current detecting of overcurrent sensing circuit 15.
More than, understand the invention that the inventor makes specifically according to embodiment, but the present invention is not limited to above-mentioned execution mode, can carry out various changes.For example, in said embodiment, discharge the transistor Q2 of usefulness, used bipolar transistor, but also can use MOSFET (field-effect transistor) as the electric charge that makes electric current flow through the switching transistor Q1 of first siding ring and filtering capacitor C3.In this case, if withstand voltage enough height of the MOSFET that uses then can omit the diode D4 among Fig. 1.
In addition, in said embodiment, the resistance R 2 of connecting with the transistor Q2 of electric charge release usefulness has been connected the collector electrode side of Q2, but also can be connected the emitter side of Q2.
Utilizability on the industry
In the above description, illustrated that mainly the invention that the inventor is made is applied to as its background Utilize the field, be the situation of AC adapter, but the present invention is not limited to this, can be widely used in making Use transformer, and the alternating voltage of inducting in the ancillary coil is carried out the power supply electricity that rectification generates control circuit The continuous-current plant of pressing.
Claims (6)
1. continuous-current plant possesses: have the transformer that the voltage transformation of ancillary coil is used; Control the control circuit of electric current of the first siding ring of this transformer; Having the exchange conversion of inducting in the described ancillary coil is the rectification unit of direct current and the rectification circuit of filtering capacitor, described control circuit can be worked the voltage that generates by described rectification circuit as supply voltage, this continuous-current plant is characterised in that
Possess voltage and reduce the unit, this voltage reduces unit, when the input voltage of the first siding ring of described transformer becomes lower than predetermined current potential, discharges the electric charge of the filtering capacitor of described rectification circuit, and the voltage that offers described control circuit is reduced.
2. continuous-current plant according to claim 1 is characterized in that,
Described voltage reduces the unit to have at resistance that the dividing potential drop that is connected in series between terminal that applies described input voltage and the reference potential point is used and the 3 terminal switch elements that are connected between the connected node of described rectification unit and described filtering capacitor and reference potential point, has applied the voltage of the voltage that depends on the electric resistance partial pressure generation of using by described dividing potential drop on the control terminal of this 3 terminal switch element.
3. continuous-current plant according to claim 2 is characterized in that,
Described 3 terminal switch elements are bipolar transistors, on the base terminal of this bipolar transistor, have applied the voltage of the electric resistance partial pressure generation of using by described dividing potential drop with element via withstand voltage protection.
4. continuous-current plant according to claim 1 is characterized in that,
Described voltage reduces the unit, is made of resistance of using in the dividing potential drop that is connected in series between terminal that is applied in described input voltage and the reference potential point and the 2 terminal switch elements that are connected between the connected node of the resistance that described rectification unit and the connected node and the described dividing potential drop of described filtering capacitor are used.
5. according to any one the described continuous-current plant in the claim 2～4, it is characterized in that,
Described control circuit, by make electric current flow through off and on described transformer first siding ring switch element and the switch driven control circuit is connected, disconnected to this switch element constitute.
6. continuous-current plant according to claim 5 is characterized in that,
On 1 semiconductor chip, described switch element and described ON-OFF control circuit have been formed as semiconductor integrated circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008165253 | 2008-06-25 | ||
| JP2008165253A JP2010011563A (en) | 2008-06-25 | 2008-06-25 | Dc power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101615852A true CN101615852A (en) | 2009-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910150847A Pending CN101615852A (en) | 2008-06-25 | 2009-06-23 | Continuous-current plant |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2010011563A (en) |
| CN (1) | CN101615852A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900760A (en) * | 2010-06-25 | 2010-12-01 | 洪金文 | Electricity meter and power source applicable to same |
| CN102158079A (en) * | 2010-01-26 | 2011-08-17 | 松下电工株式会社 | Lighting power source with controlled charging operation for driving capacitor |
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| WO2012164613A1 (en) * | 2011-05-31 | 2012-12-06 | パナソニック株式会社 | Switching power supply and semiconductor device |
| CN102983752B (en) * | 2012-12-28 | 2015-03-18 | 杭州士兰微电子股份有限公司 | Quick-start gate driving device and control module thereof |
| JP6482182B2 (en) * | 2014-04-25 | 2019-03-13 | 新電元工業株式会社 | Control circuit and switching power supply |
| KR20160108636A (en) | 2015-03-04 | 2016-09-20 | 주식회사 솔루엠 | Rectifier and power converter including the same |
| MY190877A (en) | 2016-02-05 | 2022-05-13 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Terminal charging system, charging method, and power adapter |
| SG11201700428UA (en) | 2016-02-05 | 2017-09-28 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Charge method, adapter and mobile terminal |
| CN108347179B (en) * | 2017-01-24 | 2021-06-11 | 苏州未来电器股份有限公司 | External circuit breaker control system of electric energy meter and PSR flyback switching power supply circuit thereof |
| JP6298994B1 (en) * | 2017-09-14 | 2018-03-28 | パナソニックＩｐマネジメント株式会社 | Power supply circuit and motor drive device |
| JP7186683B2 (en) * | 2019-09-10 | 2022-12-09 | 日本電産モビリティ株式会社 | switching power supply |
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| JPH05292740A (en) * | 1992-04-07 | 1993-11-05 | Nec Ibaraki Ltd | Switching regulator |
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| US6574081B1 (en) * | 1999-11-30 | 2003-06-03 | Murata Manufacturing Co., Ltd. | DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005124252A (en) * | 2003-10-14 | 2005-05-12 | Sharp Corp | Switching power supply |
| JP4748025B2 (en) * | 2006-10-18 | 2011-08-17 | パナソニック電工株式会社 | Phase control power supply |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05292740A (en) * | 1992-04-07 | 1993-11-05 | Nec Ibaraki Ltd | Switching regulator |
| JPH08126307A (en) * | 1994-10-20 | 1996-05-17 | Fujitsu General Ltd | Power source circuit |
| US6574081B1 (en) * | 1999-11-30 | 2003-06-03 | Murata Manufacturing Co., Ltd. | DC-DC converter |
| CN1937383A (en) * | 2005-09-22 | 2007-03-28 | 松下电器产业株式会社 | Switch power supply, semiconductor appatatus and controlling method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158079A (en) * | 2010-01-26 | 2011-08-17 | 松下电工株式会社 | Lighting power source with controlled charging operation for driving capacitor |
| CN102158079B (en) * | 2010-01-26 | 2014-01-29 | 松下电器产业株式会社 | Power source and lighting device |
| CN101900760A (en) * | 2010-06-25 | 2010-12-01 | 洪金文 | Electricity meter and power source applicable to same |
| CN101900760B (en) * | 2010-06-25 | 2012-02-15 | 洪金文 | Electricity meter and power source applicable to same |
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| JP2010011563A (en) | 2010-01-14 |
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Application publication date: 20091230 |