CN1074604C - Zero-switching loss switching voltage regulator - Google Patents
Zero-switching loss switching voltage regulator Download PDFInfo
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- CN1074604C CN1074604C CN98116927A CN98116927A CN1074604C CN 1074604 C CN1074604 C CN 1074604C CN 98116927 A CN98116927 A CN 98116927A CN 98116927 A CN98116927 A CN 98116927A CN 1074604 C CN1074604 C CN 1074604C
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Abstract
The present invention discloses a switching power supply which comprises an input terminal Vin, an output terminal Vo, a transformer T, a switching circuit 1, a rectification circuit 2, etc., wherein the switching circuit 1 is mainly composed of an electronic switch K1; the rectification circuit 2 is mainly composed of a first diode D1. The switching power supply is characterized in that a regulator circuit 10 is added to the primary side of the transformer T for regulating currents and voltage waveforms on the electronic switch K1 and the first diode D1, which makes at least one of the currents and the voltages of the electronic switch K1 and the first diode D1 zero or close to zero at the instant that the electronic switch K1 and the first diode D1 are respectively turned on and off. Thus, the zero switching loss of a switching tube and a rectifying diode is simultaneously implemented.
Description
The present invention relates to a kind of Switching Power Supply.
Existing Switching Power Supply, adopt PWM technology, voltage resonance converter technique or current resonance converter technique no matter be, owing to itself intrinsic shortcoming, be difficult to really realize simultaneously the zero switching loss of switching tube and rectifier diode, promptly in moment of switching tube and rectifier diode open and close, voltage on it, electric current are non-vanishing, so that the power that consumes also just can not reach is zero.
Purpose of the present invention is exactly in order to overcome the above problems, and a kind of Switching Power Supply is provided, and realizes the zero switching loss work of switching tube and rectifier diode simultaneously.
The present invention realizes that the scheme of above-mentioned purpose is: a kind of Switching Power Supply, comprise: input, output, comprise the first elementary winding and secondary winding transformer, comprise electronic switch switching circuit, comprise the rectification circuit of first diode, described electronic switch is series at the first elementary winding, and described first diode is series at secondary winding; It is characterized in that: increase on the former limit of transformer and adjust circuit, to regulate electric current, the voltage waveform on electronic switch, first diode, make the moment of electronic switch, first each comfortable open and close of diode, its electric current, voltage have an amount at least to be zero or to approach zero;
Described adjustment circuit comprises inductance, second diode, second electric capacity, the second elementary winding, the 3rd diode, the 4th diode, after wherein second diode, inductance, the 4th diode are connected in order, the negative electrode one termination input of second diode, the anode one end ground connection of the 4th diode; Second electric capacity one is terminated at the tie point place of second diode and inductance, and the other end is connected to the non-earth terminal of electronic switch; After the 3rd diode, the second elementary windings in series, the tie point place of the 3rd diode cathode one termination the 4th diode and inductance, other end ground connection, wherein the second elementary winding is the former limit winding of setting up.
Owing to adopted above scheme, suitably control conducting, the disconnection condition of electronic switch, can reach: during the electronic switch conducting and first diode when turn-offing the electric current of the two be zero, voltage when electronic switch turn-offs is zero, voltage during first diode current flow approaches zero, thereby has realized the zero switching loss switching of the electronic switch and first diode.
Fig. 1 is a circuit theory schematic diagram of the present invention (part).
Fig. 2 is functional-block diagram of the present invention (integral body).
Fig. 3 is an embodiment of the invention work wave schematic diagram.
Fig. 4 is the physical circuit figure of an embodiment.
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Embodiment one: see Fig. 1, be depicted as the topology signal of Switching Power Supply example of the present invention, comprise: input Vin, output end vo, transformer T, the switching circuit of mainly forming 1, the main rectification circuit of forming by the first diode D1 2 etc. by electronic switch K1, increase adjustment circuit 10 on the former limit of transformer T, to regulate electric current, the voltage waveform on electronic switch K1, the first diode D1, make the moment of electronic switch K1, first each comfortable open and close of diode D1, it is zero that its electric current, voltage have an amount at least;
See Fig. 1, described adjustment circuit 10 comprises inductance L 1, the second diode D2, second capacitor C, 2, the second elementary winding N2, the 3rd diode D3, the 4th diode D4 etc., after wherein the second diode D2, inductance L 1, the 4th diode D4 connect in order, the negative electrode one termination input Vin of the second diode D2, the anode one end ground connection of the 4th diode D4; Second capacitor C 2 one is terminated at the tie point place of the second diode D2 and inductance L 1, and the other end is connected to the non-earth terminal of electronic switch K1; After the 3rd diode D3, the second elementary winding N2 series connection, the tie point place of the 3rd diode D3 negative electrode one termination the 4th diode D4 and first inductance L 1, other end ground connection, wherein the second elementary winding N2 is former limit second winding of setting up.
See Fig. 2, the electric current that the main current detection circuit of being made up of No. the second current detector RSB 3 detects in the rectification circuits 2, its signal mails to switching circuit 1 through the second road current over-zero comparator 4, trigger 5, drive circuit 6 etc.; The main electric current in the current detection circuit 7 sense switch circuit of forming by first via current detector RSA 1, its signal through first via comparator 9 with come self-rectifying circuit 2 and through voltage error signal that voltage error amplifier 8 amplifies relatively after, comparison signal enters trigger 5, drive circuit 6 etc., mails to switching circuit 1.According to a physical circuit of this figure design as shown in Figure 4, the mark of contact TR1-TR4 is in order to map conveniently among the figure, and it is interconnective mark identical place, such as: the place of all mark TR1 all links to each other, surplus together.Control circuit comprises the second road current over-zero comparator 4, voltage error amplifier 8, first via comparator 9, trigger 5, drive circuit 6 etc.
Use above circuit, the break-make of control electronic switch K1 makes the change procedure of its one-period as follows: (1) No. the second current detector 3 detects the secondary current signal, compares with the second road current over-zero comparator 4, when detecting secondary current I
RSB=0 o'clock, send a trigger impulse, make trigger 5 counter-rotatings send high level signal, make electronic switch K1 conducting through drive circuit 6.(2) after the electronic switch K1 conducting, current detector A detects primary current I
RSARise gradually, this current value is compared with the error signal of sending here through voltage error amplifier 8, works as I
RSAWhen being higher than error signal, send a high level pulse, make the counter-rotating of trigger 5 states, thus stopcock electronic switch K1, the first diode D1 conducting.(3) along with I
RSBDecline and to zero, get back to state (1), thereby finish the work of one-period.
Like this, the waveform of electronic switch K1, second capacitor C 2, the first diode D1 should be as shown in Figure 3, and wherein a is the K1 driving voltage waveform, b is a K1 switching voltage waveform, and c is the C2 voltage waveform, and d is the K1 current waveform, e is the D1 current waveform, and f is the C2 current waveform, and g is the D1 voltage waveform.So we can obtain following analysis result:
1, during electronic switch K1 conducting,, is zero (condition that electronic switch K1 opens is that electric current is 0 among the RSB), realizes that zero loss is open-minded so open immediate current because electric current can not suddenly change in the inductance; Based on identical reason (moment that the first diode D1 oppositely turn-offs, electronic switch K1 moment of opening) just, the first diode D1 realizes that zero loss turn-offs.
2, suppose that the turn ratio correlation that we get the first elementary winding N1 and the second elementary winding N2 is N2=N1/2 (if other ratios, can in like manner analyze), in the electronic switch K1 turn on process, because voltage can not suddenly change on second capacitor C 2, so inductance L 1 has been applied in the voltage greater than Vin/2, because the energy storage afterflow effect of inductance, the clamping action of the first diode D1 and the second diode D2, the afterflow effect of the 3rd diode D3, thereby make the voltage on second capacitor C 2 rise to Vin, because the second diode D2, the unidirectional on state characteristic of the 3rd diode D3 makes voltage on second capacitor C 2 be remained to electronic switch K1 when turn-offing.
The electric capacity both end voltage when 3, electronic switch K1 turn-offs, on second capacitor C 2 voltage that equates with Vin arranged, owing to can not be suddenlyd change, so switch ends voltage can not suddenly change, equate with the shutoff prepotential, so just realized the no-voltage shutoff, thereby the zero loss that has realized electronic switch K1 is turn-offed.
4, since the conduction voltage drop of the first diode D1 equal diode just with to conduction voltage drop (forward resistance is very little, so pressure drop is very little, promptly about 0.7V), so that the conduction loss of the first diode D1 also approaches is zero.
To sum up 1 and 4 as can be known, and the present invention has realized the zero switching loss switching of the electronic switch K1 and the first diode D1.In the experiment of a reality, adopt circuit mode of the present invention, import at 48V,
24V output, electric current are in the PWT power supply of 6A, have realized 89% efficient, than not raising the efficiency 4% with before this circuit.
Claims (2)
1. Switching Power Supply, comprise: input (Vin), output (Vo), comprise the first elementary winding (N1) and secondary winding transformer (T), comprise electronic switch (K1) switching circuit (1), comprise the rectification circuit (2) of first diode (D1), described electronic switch (K1) is series at the first elementary winding (N1), and described first diode (D1) is series at secondary winding; It is characterized in that: increase on the former limit of transformer (T) and adjust circuit (10), to regulate electric current, the voltage waveform on electronic switch (K1), first diode (D1), make the moment of electronic switch (K1), each comfortable open and close of first diode (D1), its electric current, voltage have an amount at least to be zero or to approach zero;
Described adjustment circuit (10) comprises inductance (L1), second diode (D2), second electric capacity (C2), the second elementary winding (N2), the 3rd diode (D3), the 4th diode (D4), after wherein second diode (D2), inductance (L1), the 4th diode (D4) are connected in order, the negative electrode one termination input (Vin) of second diode (D2), the anode one end ground connection of the 4th diode (D4); Second electric capacity (C2) one is terminated at the tie point place of second diode (D2) and inductance (L1), and the other end is connected to the non-earth terminal of electronic switch (K1); After the 3rd diode (D3), the series connection of the second elementary winding (N2), the tie point place of the 3rd diode (D3) negative electrode one termination the 4th diode (D4) and inductance (L1), other end ground connection, wherein the second elementary winding (N2) is the former limit winding of setting up.
2. Switching Power Supply as claimed in claim 1, it is characterized in that: the current detection circuit (3) that comprises No. the second current detector (RSB) detects the electric current in the rectification circuit (2), its signal mails to switching circuit (1) through the second road current over-zero comparator (4), trigger (5), drive circuit (6);
Comprise the electric current in current detection circuit (7) the sense switch circuit (1) of first via current detector (RSA), its signal through first via comparator (9) with come self-rectifying circuit (2) and through voltage error amplifier (8) amplifying signal relatively after, comparison signal enters trigger (5), drive circuit (6), mails to switching circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98116927A CN1074604C (en) | 1998-08-20 | 1998-08-20 | Zero-switching loss switching voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98116927A CN1074604C (en) | 1998-08-20 | 1998-08-20 | Zero-switching loss switching voltage regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1224947A CN1224947A (en) | 1999-08-04 |
| CN1074604C true CN1074604C (en) | 2001-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98116927A Expired - Lifetime CN1074604C (en) | 1998-08-20 | 1998-08-20 | Zero-switching loss switching voltage regulator |
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| CN (1) | CN1074604C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103829A (en) * | 1985-05-11 | 1986-11-05 | 西门子公司 | Switching elements with the through-flow code converter of free oscillation |
| EP0802615A2 (en) * | 1994-01-28 | 1997-10-22 | Matsushita Electric Industrial Co., Ltd. | Switching power source apparatus |
-
1998
- 1998-08-20 CN CN98116927A patent/CN1074604C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103829A (en) * | 1985-05-11 | 1986-11-05 | 西门子公司 | Switching elements with the through-flow code converter of free oscillation |
| EP0802615A2 (en) * | 1994-01-28 | 1997-10-22 | Matsushita Electric Industrial Co., Ltd. | Switching power source apparatus |
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| Publication number | Publication date |
|---|---|
| CN1224947A (en) | 1999-08-04 |
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Address after: First floor, 3 floor, electrical workshop, HUAWEI base, industrial zone, Longgang District, Guangdong, China Applicant after: Ansheng Electric Co., Ltd., Shenzhen City Address before: Five floor, Arts crafts emporium, Nanshan District science and Technology Park, Shenzhen, Guangdong Applicant before: Huawei Electric Co., Ltd., Shenzhen |
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Free format text: CORRECT: APPLICANT; FROM: SHENZHEN HUAWEI ELECTRICAL CO., LTD. TO: SHENZHEN ANSHENG ELECTRICAL CO., LTD. |
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Owner name: EMERSON NETWORK POWER CO., LTD Free format text: FORMER NAME OR ADDRESS: SHENZHEN ANSHENG ELECTRICAL CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: Huadian Power Plant, Longgang District, Guangdong District, Shenzhen Province Patentee after: Aimosheng Network Energy Source Co., Ltd. Address before: Guangdong Province, Shenzhen District, Longgang province HUAWEI industrial base, Patentee before: Ansheng Electric Co., Ltd., Shenzhen City |
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Owner name: POWER SUPPLY PRODUCTS (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: AIMOSHENG NETWORK ENERGY SOURCE CO LTD Effective date: 20140904 |
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Free format text: CORRECT: ADDRESS; FROM: 518129 SHENZHEN, GUANGDONG PROVINCE TO: 518101 SHENZHEN, GUANGDONG PROVINCE |
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Effective date of registration: 20140904 Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Astec power supply (Shenzhen) Co., Ltd. Address before: 518129, Shenzhen, Guangdong province Longgang District snow Gang Industrial Zone Huadian building on the first floor of the third floor Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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