CN100454739C - Self-exciting switching power supply - Google Patents
Self-exciting switching power supply Download PDFInfo
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- CN100454739C CN100454739C CNB2004100184317A CN200410018431A CN100454739C CN 100454739 C CN100454739 C CN 100454739C CN B2004100184317 A CNB2004100184317 A CN B2004100184317A CN 200410018431 A CN200410018431 A CN 200410018431A CN 100454739 C CN100454739 C CN 100454739C
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Abstract
The present invention discloses a self-exciting switching power supply which is characterized in that a power supply circuit is that a full wave voltage doubling rectification and filter circuit is connected with a high-frequency self-exciting oscillation and high-frequency oscillation and ripple elimination circuit; the high-frequency self-exciting oscillation and high-frequency oscillation and ripple elimination circuit is respectively connected with a secondary rectification and filter circuit and a sampling circuit of voltage-stabilization control, overvoltage control and short circuit overcurrent control; the secondary rectification and filter circuit is connected with the sampling circuit of voltage-stabilization control, overvoltage control and short circuit overcurrent control. Because the present invention is additionally provided with the high-frequency oscillation and high-frequency ripple elimination circuit, the present invention does not need an oscillation circuit chip when implemented. Therefore, the present invention has the advantages of simple structure, low manufacturing cost and easy popularization and mass production. Besides, because the present invention uses a high-frequency transformer and has reasonable structural design and a reasonable winding method, the switching power supply has the advantages of stable and reliable circuit operation and large output power. Besides, the accuracy, the voltage regulation ratio, the loading regulation ratio, the output ripples, etc. of a direct current voltage outputted by the switching power supply are all superior to those of various switching power supplies on the existing market.
Description
Technical field:
The invention belongs to the technical field of Switching Power Supply, specifically a kind of self-activated switch power supply that relates to.
Background technology:
The circuit of present self-activated switch power supply is comparatively complicated, and weakening and high frequency ripple are not set eliminate circuit, therefore the error of voltage accuracy and output ripple is bigger, the error of voltage regulation, load regulation is also bigger, the high-frequency self-excitation oscillating circuit of this external Switching Power Supply can produce an oscillating impulse, this oscillating impulse is similar to rectangular ripple, have the very big forward and the waveform of negative peak, such waveform not only damages switching transistor easily, and power consumption is big, and it is big to exchange high-frequency ripple.
Summary of the invention:
The object of the present invention is to provide a kind of improved self-activated switch power supply, it can make the error of voltage accuracy and output ripple less.
To achieve these goals, technical scheme of the present invention is: a kind of self-activated switch power supply, it mainly comprises housing and is contained in the interior power circuit of housing, it is characterized in that: described power circuit is, the full wave and voltage doubling rectification is eliminated circuit with filter circuit with high-frequency self-excitation vibration and weakening high frequency ripple and is connected, the high-frequency self-excitation vibration is eliminated circuit with the weakening high frequency ripple and is connected with filter circuit with the secondary rectification respectively, the sampling voltage stabilizing was controlled pressure-controlled short circuit overcurrent control circuit and was connected, and the secondary rectification was controlled pressure-controlled short circuit overcurrent control circuit with filter circuit and sampling voltage stabilizing and is connected.
The present invention is owing to set up weakening and high frequency ripple elimination circuit, when implementing, do not need the oscillating circuit chip, therefore simple in structure, low cost of manufacture is easy to promote and produce in enormous quantities, and has used high frequency transformer, its reasonable structural design and winding method, make that the switching power circuit working stability is reliable, power output is big, and the precision of output dc voltage, voltage regulation, load regulation and output ripple etc. all are better than the various Switching Power Supplies on the existing market.
Description of drawings:
Fig. 1 is an electrical block diagram of the present invention
Fig. 2 is the circuit theory diagrams of one embodiment of the invention
Fig. 3 is a fundamental diagram of the present invention
Fig. 4 is a rectangle oscillating impulse output waveform figure on the switching transistor collector electrode in the prior art
Fig. 5 is a high frequency transformer high-frequency impulse oscillogram of the present invention
Embodiment:
Below in conjunction with drawings and Examples the present invention is further described.
The present invention mainly comprises housing and is contained in the interior power circuit of housing, it is different from prior art and is: described power circuit is, the full wave and voltage doubling rectification is eliminated circuit 2 with filter circuit 1 with high-frequency self-excitation vibration and weakening high frequency ripple and is connected, the high-frequency self-excitation vibration is eliminated circuit with the weakening high frequency ripple and is connected with filter circuit 3 with the secondary rectification respectively, the sampling voltage stabilizing was controlled pressure-controlled short circuit overcurrent control circuit 4 and was connected, the secondary rectification was controlled pressure-controlled short circuit overcurrent control circuit with filter circuit and sampling voltage stabilizing and was connected, wherein high-frequency self-excitation vibration and weakening high frequency ripple elimination circuit are seen Fig. 2, one end of first capacitor C 6 is connected with an end of first resistance R 2 and an end of primary, the other end of first capacitor C 6 respectively with an end of second capacitor C 7, the negative terminal of diode D1, the other end of first resistance R 2 connects, the anode of diode D1 is connected with the end of the second resistance R L, the other end of the other end of second capacitor C 7 and the second resistance R L, the other end of primary connects, the overcurrent short-circuit control circuit is arranged in the high-frequency self-excitation oscillating circuit, in the overcurrent short-circuit control circuit end of the 3rd resistance R 14 respectively with the emitter of switching transistor V1, one end of the 4th resistance R 13 connects, the other end ground connection of the 3rd resistance R 14.When overcurrent, short circuit; during the voltage drop on the 3rd resistance R 14 〉=1V; then make V2 transistor turns (0.7V); this moment V1 Vce＜0.7V; V1 is ended, and at this moment circuit is output as 0, reaches protective effect; it is high speed diode that weakening and high frequency ripple are eliminated the diode D1 described in the circuit, and the second resistance R L is a high frequency magnetic core resistance.
In the prior art, after powering on, circuit will form oscillating impulse output at the collector electrode of switching transistor V1, this square wave pulse is a waveform with very big forward peak value and negative peak, see Fig. 4, the comparable input supply voltage of this crest voltage (300V) is high 2～3 times, as seen such crest not only damages switching transistor V1 easily, power consumption is bigger in addition, the interchange high-frequency ripple is big, in order to overcome above-mentioned these phenomenons, the present invention's design in concrete enforcement adopts special weakening and high frequency ripple to eliminate circuit, makes the forward and the negative sense upward peak pulse complete obiteration basically of the output voltage waveforms on the switching transistor V1 collector electrode.
Operation principle of the present invention is seen Fig. 3, magnetic energy is stored in the transformer T1 in the Ton time from input, then this magnetic energy is emitted to output as a kind of power output in the time at the Toff that is right after, the Toff time is when finishing, OV is returned in the free oscillation of transformer T1 voltage, because the voltage of the base winding of transformer is the triggering signal of the on of V1, promptly begin new one-period, promptly form the self-excitation higher-order of oscillation, finish the high frequency conversion (input voltage vin becomes output voltage V out) of Switching Power Supply thus.
The present invention adopts high frequency transformer when implementing, the winding method of technical finesses such as this high frequency transformer employing is elementary, secondary winding alternatively layered, even space out, and its oscillogram is seen Fig. 5.
Claims (2)
1, a kind of self-activated switch power supply, it mainly comprises housing and is contained in the interior power circuit of housing, it is characterized in that: described power circuit is, the full wave and voltage doubling rectification is eliminated circuit with filter circuit with high-frequency self-excitation vibration and weakening high frequency ripple and is connected, the high-frequency self-excitation vibration is eliminated circuit with the weakening high frequency ripple and is connected with filter circuit with the secondary rectification respectively, the sampling voltage stabilizing was controlled pressure-controlled short circuit overcurrent control circuit and was connected, the secondary rectification was controlled pressure-controlled short circuit overcurrent control circuit with filter circuit and sampling voltage stabilizing and was connected, high-frequency self-excitation vibration and weakening high frequency ripple are eliminated in the circuit, one end of first electric capacity (C6) is connected with an end of first resistance (R2) and an end of primary, the other end of first electric capacity (C6) respectively with an end of second electric capacity (C7), the negative terminal of diode (D1), the other end of first resistance (R2) connects, the anode of diode (D1) is connected with an end of second resistance (RL), the other end of the other end of second electric capacity (C7) and second resistance (RL), the other end of primary connects, high-frequency self-excitation vibration and weakening high frequency ripple are eliminated in the circuit the overcurrent short-circuit control circuit, in the overcurrent short-circuit control circuit end of the 3rd resistance (R14) respectively with the emitter of switching transistor (V1), one end of the 4th resistance (R13) connects, the other end ground connection of the 3rd resistance (R14).
2, by the described a kind of self-activated switch power supply of claim 1, it is characterized in that: it is high speed diode that high-frequency self-excitation vibration and weakening high frequency ripple are eliminated the diode (D1) described in the circuit, and second resistance (RL) is high frequency magnetic core resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100184317A CN100454739C (en) | 2004-05-18 | 2004-05-18 | Self-exciting switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100184317A CN100454739C (en) | 2004-05-18 | 2004-05-18 | Self-exciting switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1700574A CN1700574A (en) | 2005-11-23 |
| CN100454739C true CN100454739C (en) | 2009-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100184317A Expired - Fee Related CN100454739C (en) | 2004-05-18 | 2004-05-18 | Self-exciting switching power supply |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107073715B (en) * | 2017-01-13 | 2019-10-18 | 深圳市奥星澳科技有限公司 | A kind of Wireless intelligent control device and system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100410A (en) * | 1985-01-22 | 1986-07-23 | 菲利浦光灯制造公司 | Self-oscillating power-supply circuit |
| CN1050625A (en) * | 1990-10-17 | 1991-04-10 | 邹鹏程 | Self-excitation switching mode voltage stablizer |
| CN1118119A (en) * | 1994-09-03 | 1996-03-06 | 黄得泰 | Self excited switch source with overcurrent protection |
| CN2513287Y (en) * | 2001-08-22 | 2002-09-25 | 赵毅 | Switch stable voltage power source |
| CN2572664Y (en) * | 2002-09-20 | 2003-09-10 | 毛灿豪 | Switch power source with short circuit protection |
| CN2706958Y (en) * | 2004-05-18 | 2005-06-29 | 上海美芝欧加电器有限公司 | Self-activated switch power |
-
2004
- 2004-05-18 CN CNB2004100184317A patent/CN100454739C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100410A (en) * | 1985-01-22 | 1986-07-23 | 菲利浦光灯制造公司 | Self-oscillating power-supply circuit |
| CN1050625A (en) * | 1990-10-17 | 1991-04-10 | 邹鹏程 | Self-excitation switching mode voltage stablizer |
| CN1118119A (en) * | 1994-09-03 | 1996-03-06 | 黄得泰 | Self excited switch source with overcurrent protection |
| CN2513287Y (en) * | 2001-08-22 | 2002-09-25 | 赵毅 | Switch stable voltage power source |
| CN2572664Y (en) * | 2002-09-20 | 2003-09-10 | 毛灿豪 | Switch power source with short circuit protection |
| CN2706958Y (en) * | 2004-05-18 | 2005-06-29 | 上海美芝欧加电器有限公司 | Self-activated switch power |
Non-Patent Citations (2)
| Title |
|---|
| 一种新型的自激式开关稳压电源. 王锡城，刘素英.电视技术，第6期. 1983 |
| 一种新型的自激式开关稳压电源. 王锡城，刘素英.电视技术，第6期. 1983 * |
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| Publication number | Publication date |
|---|---|
| CN1700574A (en) | 2005-11-23 |
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Granted publication date: 20090121 Termination date: 20120518 |