CN1262551A - Dual-output power supply with high voltage stability and high precision - Google Patents
Dual-output power supply with high voltage stability and high precision Download PDFInfo
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- CN1262551A CN1262551A CN 00101439 CN00101439A CN1262551A CN 1262551 A CN1262551 A CN 1262551A CN 00101439 CN00101439 CN 00101439 CN 00101439 A CN00101439 A CN 00101439A CN 1262551 A CN1262551 A CN 1262551A
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- 238000001914 filtration Methods 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract description 3
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Abstract
A dual-output power supply with high voltage-stabilizing accuracy is composed of two output circuits and two control protectors. The first output circuit is a postively triggered converter composed of transformer and electronic switch. The second output circuit consists of magnetic amplifier and rectifying, energy storing and filtering circuit. The input of magnetic amplifier is connected to secondary winding of transformer and its output to the second output via said rectifying, energy storing and filtering circuit. Its advantages are high efficiency, low ripple and individual regulation of each output.
Description
The present invention relates to a kind of dual-output power supply, particularly the DC/DC converter that two-way output is arranged of high voltage stability precision.
Existing DC/DC converter is that a kind of dc voltage conversion with certain level becomes another device higher or more low level direct voltage.Forward converter is a kind of canonical topology wherein, generally is made of transformer, switching tube, rectifying tube and energy storage unit.Former limit circuit mainly is made up of switching tube and primary windings in series, and switching tube is controlled former limit connecting and disconnecting of the circuit at interval with certain hour, and this time interval is controlled by output voltage feedback signal.By such closed-loop control, add the energy storage and the filter element of secondary, can obtain a galvanic current at secondary and press.The former and deputy limit of transformer winding under the switching tube break-make influence of series connection with it, produces the direct current square-wave voltage on same magnetic core, be responsible for former limit energy is transmitted to secondary, and transformer will be isolated between the input and output of converter mutually.Secondary circuit comprises transformer secondary output, rectifying tube, energy storage and filter circuit, is responsible for high frequency square wave is converted to direct voltage.
In field of switch power, people more consider succinct, the efficient and high power density of circuit recently.When whole electronic system volume is planned more hour, the decline of the size of power supply seems suitable important in the system.And the different piece of circuit system needs different electrical power voltage, and like this, the difficult problem that the power supply designer faces just provides and can satisfy multichannel needs, volume is littler, performance is more excellent power supply.For example, along with computer chip manufacturing technology and requirements of saving energy, originally use the place of single+5V power supply, begin now to+3.3V ,+2.5V even more low-work voltage transition, make like this in the field of using various chips, exist the requirement of different electric pressures, if in a volume, realize the multichannel output voltage, both accomplished to reduce volume, and can satisfy instructions for use again, a kind of economically viable good method of can yet be regarded as.But the power supply that uses under this occasion, be different from conventional multi-output power supply again, special requirement is arranged, promptly each road output voltage can both keep the higher precision of voltage regulation under load, input voltage change, and it is when requiring one tunnel load variations, very little to other one road output voltage precision influence.Existing supply unit mostly can't satisfy this requirement.
In the patent No. is that US5715153, name are called in the United States Patent (USP) of " Dual-output DC-DC power supply ", discloses a kind of dual-output power supply, and its volume is less, also can independent regulation between the two-way output.Its first via output adopts a forward converter (Forward Convert) to realize, the second tunnel output is transformed into relatively low direct voltage to the output of the direct current of the first via with step down voltage redulator (Buck Regulator) and realizes.Each personal independently control device of two-way output circuit.Its shortcoming is the efficient low (because lossy) of carrying out step-down with direct current, and BuckRegulator is controlled its circuit complexity.
Purpose of the present invention is exactly to provide a kind of dual-output power supply with high voltage stability and high precision in order to overcome the above problems, but realizes that volume is little, independent regulation between the two-way, and the efficient height, controls simple purpose.
The present invention realizes that the scheme of above-mentioned purpose is: a kind of dual-output power supply with high voltage stability and high precision, comprise: first via output circuit, first via control protection electric circuit, No. the second output circuit, the second tunnel control and the protective circuit, it is characterized in that: described first via output circuit is a forward converter, and it comprises transformer, electronic switch; Electronic switch is series at the former limit of transformer, the output of its control termination first via control and protective circuit; The secondary of transformer connects first via lead-out terminal behind first via rectification energy storage filter circuit.Described No. the second output circuit comprises the magnetic amplifier and the second tunnel rectification energy storage filter circuit; the input of magnetic amplifier directly is connected to the secondary of transformer; its output connects the second road lead-out terminal behind the second tunnel rectification energy storage filter circuit; input termination the second road lead-out terminal of the second tunnel control and protective circuit, its output then is connected between the output and the second tunnel rectification energy storage filter circuit of magnetic amplifier.
Owing to adopted above scheme, No. the second output circuit is to introduce from the transformer secondary output of first via output circuit, and the two common transformer has effectively reduced volume; No. the second output circuit directly obtains from the transformer secondary, rather than is obtained through buck converter by the direct voltage of first via output again, like this than the efficient height with step down voltage redulator.Because magnetic amplifier is connected in the circuit, can suppress noise and reduce interference, so the power supply ripple of this programme is little, noise is low, (RFI) is little for electromagnetic interference (EMI) and radio frequency interference.Because the control of two-way and protective circuit are independent separately; every road output voltage is independent regulation separately; during load variations; the mutual regulation problem that does not have general multi-output power supply to produce; and do not exceeding under the output gross power prerequisite; output current can be exported separately by arbitrary road, also can increase the flexibility that the user uses by two road combined outputs.
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is a physical circuit schematic diagram of the embodiment of the invention.
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Main points of the present invention are: at the power supply of two-way output, modular circuit master's topology adds the electric capacity resonant reset for single-ended forward converter, and two-way output is parallel to the transformer secondary output two ends at secondary, obtains two kinds of specification voltages by current rectifying and wave filtering circuit separately.First via output voltage by former secondary buffer circuit, is controlled former limit switching tube make-and-break time with pulse width modulating chip PWM closed-loop control, also promptly the energy size is transmitted to secondary in former limit and controls, thereby obtain first via stable DC voltage.The second road output voltage adopts the magnetic amplifier technology to realize voltage stabilizing, and its control circuit is positioned at secondary, independent control the second road output voltage; It is simple that the control ratio BUCK converter (buck converter) of magnetic amplifier is wanted.The foregoing circuit unit all is placed on one and independently encapsulates in the integral body.Two output voltage is independently controlled by control circuit separately among the present invention, and the output of every road converter can both well be regulated.And under the service condition of regulation, two-way voltage can both keep the higher precision of voltage regulation when input voltage and load variations, when one tunnel output loading changes, influences other one road output voltage hardly.Be no more than under the specified gross output prerequisite, this electric power outputting current can distribute arbitrarily, promptly can be exported separately by a certain road, also can be by two road combined outputs.
Its concrete scheme is seen Fig. 1, shown in dual-output power supply with high voltage stability and high precision comprise: first via output circuit 1, first via control protection electric circuit 2, No. the second output circuit 3, the second tunnel control and the protective circuit 4.Described first via output circuit 1 is a forward converter, and it comprises transformer T, electronic switch Q; Electronic switch Q is series at the former limit of transformer T, the output of its control termination first via control and protective circuit 2; The secondary of transformer T meets first via lead-out terminal U behind first via rectification energy storage filter circuit
O1,-U
O1
Described No. the second output circuit 3 comprises the magnetic amplifier MA and the second tunnel rectification energy storage filter circuit, and the input of magnetic amplifier MA directly is connected to the secondary of transformer T, and its output meets the second road lead-out terminal U behind the second tunnel rectification energy storage filter circuit
O2, input termination the second road lead-out terminal U of the second tunnel control and protective circuit 4
O2, its output then is connected between the output and the second tunnel rectification energy storage filter circuit of magnetic amplifier MA.
Described first via rectification energy storage filter circuit comprises the first rectifying tube D1, first inductance L 1 and first capacitor C 1; Described the second tunnel rectification energy storage filter circuit comprises the second rectifying tube D2, second inductance L 2 and second capacitor C 2.
Also comprise current sampling circuit 5, sampling and output protection circuit 6 in this power module, described current sampling circuit 5 one termination electronic switch Q negative terminals, an input of another termination first via control and protective circuit 2; Sampling and output protection circuit 6 one termination first via lead-out terminal U
O1, another input of another termination first via control and protective circuit 2.
Fig. 2 is the circuit diagram of a specific embodiment.
As mentioned above, the forward converter circuit mainly is made up of switching tube Q and transformer T (establishing the turn ratio is n), rectifying tube D1, inductance L 1 and capacitor C 1.Switching tube Q close and the time, former limit energy is delivered to secondary by transformer Q, simultaneously part energy is stored in the inductance L 1.When switching tube turn-offed, output voltage was kept by afterflow inductance L 1, and L1 and C1 form output filter circuit simultaneously, and high frequency square wave is converted into direct voltage.If the switching tube ON time is D, according to following formula:
Ui * D/n=U
O1(in the formula: Ui is an input voltage, and n is the transformer turn ratio) by control switch pipe ON time, can control output voltage keep stable as can be seen.
See Fig. 2; control and protective circuit 1 are mainly finished by Switching Power Supply control chip 38C43; mainly,, finally make output voltage stabilization to control the energy size that carry to secondary on former limit according to the difference output respective party wave impulse driving switch pipe Q of actual output voltage and rated value.
Current sampling circuit 5 is mainly by current transformer (former limit T2A; secondary T2B) forms; be used for primary current waveform necessary when pulse width modulating chip PWM provides work; simultaneously when electric current surpasses predetermined value; pulse width modulating chip PWM output pulse is closed, so also play the effect of input and output side overcurrent protection.
Sampling and output protection circuit 6 are used for when output voltage changes; by buffer circuit (mainly forming) this difference is delivered to former limit and gives pulse width modulating chip PWM by some isolating devices such as transformer T, optocoupler N3A, N3B, N4A, N4B etc.; when two output voltage is arbitrary when passing by voltage, also turn-off pulse width modulating chip PWM simultaneously by this circuit.Its main element has diode N5, N3A, N3B, N4A, N4B, Z4, Z5 etc.
Whether saturated the second tunnel control and protective circuit 4 be by control magnetic amplifier MA according to output voltage and rated value difference, and what of output are decision transformer T secondary energy delivery arrive, and reach the second tunnel output voltage stabilizing purpose.Its main element has diode N6, triode Q8, diode D9 etc.
The modular power source that uses the present invention to realize has following characteristics:
1, efficient height, particularly the second tunnel output directly obtain from the transformer secondary, rather than by The output of first via direct current obtains through buck converter again, on average exceeds than other scheme efficient like this 3～4%;
2, ripple is little, noise is low, and electromagnetic interference (EMI) and Radio frequency interference (RFI) are little. By Be connected in the circuit in magnetic amplifier, can suppress noise and reduce disturbance.
3, every road output voltage independent regulation separately, during load variations, the mutual regulation problem that does not have general multi-output power supply to produce.
4, do not exceeding under the output gross power prerequisite, output current can be exported separately by arbitrary road, also can increase the flexibility that the user uses by two road combined outputs.
Claims (3)
1, a kind of dual-output power supply with high voltage stability and high precision, comprise: first via output circuit (1), first via control protection electric circuit (2), No. the second output circuit (3), the second tunnel control and the protective circuit (4), it is characterized in that: described first via output circuit (1) is a forward converter, and it comprises transformer (T), electronic switch (Q); Electronic switch (Q) is series at the former limit of transformer (T), the output of its control termination first via control and protective circuit (2); The secondary of transformer (T) meets first via lead-out terminal (U behind first via rectification energy storage filter circuit
O1,-U
O1);
Described No. the second output circuit (3) comprises the magnetic amplifier (MA) and the second tunnel rectification energy storage filter circuit, the input of magnetic amplifier (MA) directly is connected to the secondary of transformer (T), and its output meets the second road lead-out terminal (U behind the second tunnel rectification energy storage filter circuit
O2), the input termination the second road lead-out terminal (U of the second tunnel control and protective circuit (4)
O2), its output then is connected between the output and the second tunnel rectification energy storage filter circuit of magnetic amplifier (MA).
2, dual-output power supply with high voltage stability and high precision as claimed in claim 1 is characterized in that: described first via rectification energy storage filter circuit comprises first rectifying tube (D1), first inductance (L1) and first electric capacity (C1); Described the second tunnel rectification energy storage filter circuit comprises second rectifying tube (D2), second inductance (L2) and second electric capacity (C2).
3, dual-output power supply with high voltage stability and high precision as claimed in claim 1 or 2, it is characterized in that: also comprise current sampling circuit (5), sampling and output protection circuit (6), described current sampling circuit (5) one termination electronic switch (Q) negative terminals, an input of another termination first via control and protective circuit (2); Sampling and output protection circuit (6) one termination first via lead-out terminal (U
O1), another input of another termination first via control and protective circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001014390A CN1145253C (en) | 2000-01-13 | 2000-01-13 | Dual-output power supply with high voltage stability and high precision |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001014390A CN1145253C (en) | 2000-01-13 | 2000-01-13 | Dual-output power supply with high voltage stability and high precision |
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| CN1262551A true CN1262551A (en) | 2000-08-09 |
| CN1145253C CN1145253C (en) | 2004-04-07 |
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| CNB001014390A Expired - Lifetime CN1145253C (en) | 2000-01-13 | 2000-01-13 | Dual-output power supply with high voltage stability and high precision |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352156C (en) * | 2003-12-25 | 2007-11-28 | 伊博电源（杭州）有限公司 | Magnetic amplifier auxiliary output circuit of isolation switch power source |
| CN1879287B (en) * | 2003-11-04 | 2011-04-13 | Nxp股份有限公司 | Forward converter |
| CN102790518A (en) * | 2012-08-27 | 2012-11-21 | 合肥海明科技开发有限责任公司 | Shutoff protective power supply device |
| CN103119839A (en) * | 2010-07-29 | 2013-05-22 | 艾沃特有限公司 | Dual output power supply |
| CN104602437A (en) * | 2015-01-13 | 2015-05-06 | 吉林大学 | Energy field generating device and control method thereof |
| CN104901560A (en) * | 2015-06-24 | 2015-09-09 | 航天长峰朝阳电源有限公司 | High-frequency switch power supply converter employing magnetic amplification technology |
| CN105429488A (en) * | 2015-12-16 | 2016-03-23 | 中国电子科技集团公司第四十三研究所 | Magnetic amplifier based switch power supply self-feedback circuit and control method therefor |
| CN105790589A (en) * | 2016-03-08 | 2016-07-20 | 马鞍山职业技术学院 | Multi-output switching converter with high efficiency and high accuracy |
| CN109980943A (en) * | 2019-04-08 | 2019-07-05 | 北京承力电源有限公司 | A kind of two-way voltage-stabilizing Switching Power Supply of the voltage superposition based on magnetic amplifier |
| CN113364296A (en) * | 2021-05-14 | 2021-09-07 | 长城电源技术有限公司 | Switching power supply circuit and power supply device |
| CN114825939A (en) * | 2022-03-09 | 2022-07-29 | 冠捷电子科技(福建)有限公司 | High-precision switching power supply circuit based on double-group output of single transformer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100544177C (en) * | 2006-03-08 | 2009-09-23 | 艾默生网络能源系统有限公司 | Voltage-adjustable multi-output power supply and method for adjusting output voltage thereof |
-
2000
- 2000-01-13 CN CNB001014390A patent/CN1145253C/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1879287B (en) * | 2003-11-04 | 2011-04-13 | Nxp股份有限公司 | Forward converter |
| CN100352156C (en) * | 2003-12-25 | 2007-11-28 | 伊博电源（杭州）有限公司 | Magnetic amplifier auxiliary output circuit of isolation switch power source |
| CN103119839A (en) * | 2010-07-29 | 2013-05-22 | 艾沃特有限公司 | Dual output power supply |
| CN102790518A (en) * | 2012-08-27 | 2012-11-21 | 合肥海明科技开发有限责任公司 | Shutoff protective power supply device |
| CN104602437B (en) * | 2015-01-13 | 2017-11-14 | 吉林大学 | A kind of energy field generating means and its control method |
| CN104602437A (en) * | 2015-01-13 | 2015-05-06 | 吉林大学 | Energy field generating device and control method thereof |
| CN104901560A (en) * | 2015-06-24 | 2015-09-09 | 航天长峰朝阳电源有限公司 | High-frequency switch power supply converter employing magnetic amplification technology |
| CN105429488A (en) * | 2015-12-16 | 2016-03-23 | 中国电子科技集团公司第四十三研究所 | Magnetic amplifier based switch power supply self-feedback circuit and control method therefor |
| CN105790589A (en) * | 2016-03-08 | 2016-07-20 | 马鞍山职业技术学院 | Multi-output switching converter with high efficiency and high accuracy |
| CN105790589B (en) * | 2016-03-08 | 2018-05-11 | 马鞍山职业技术学院 | A kind of multi-output switching converter of high-efficiency high-precision |
| CN109980943A (en) * | 2019-04-08 | 2019-07-05 | 北京承力电源有限公司 | A kind of two-way voltage-stabilizing Switching Power Supply of the voltage superposition based on magnetic amplifier |
| CN113364296A (en) * | 2021-05-14 | 2021-09-07 | 长城电源技术有限公司 | Switching power supply circuit and power supply device |
| CN114825939A (en) * | 2022-03-09 | 2022-07-29 | 冠捷电子科技(福建)有限公司 | High-precision switching power supply circuit based on double-group output of single transformer |
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| Publication number | Publication date |
|---|---|
| CN1145253C (en) | 2004-04-07 |
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