CN101039072A - Switching power device - Google Patents
Switching power device Download PDFInfo
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- CN101039072A CN101039072A CN 200610200236 CN200610200236A CN101039072A CN 101039072 A CN101039072 A CN 101039072A CN 200610200236 CN200610200236 CN 200610200236 CN 200610200236 A CN200610200236 A CN 200610200236A CN 101039072 A CN101039072 A CN 101039072A
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- power supply
- pulse width
- width modulator
- rectifying
- rectification filtering
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- 238000001914 filtration Methods 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 22
- 230000035939 shock Effects 0.000 claims description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 241001676573 Minium Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The invention discloses a switch power supply device which relates to power supply transform technology field comprising a rectifying and filtering circuit, a pulse transformer, a pulse width modulator, and a switch tube controlled by the pulse width modulator. The pulse width modulator is supplied with power by a flyback rectifying and filtering power supply and a fowword rectifying and filtering power supply. The winding terminal which connects with the anode of rectifying element of the fowword rectifying and filtering power supply and the dc input terminal of the primary winding of the pulse transformer are dotted terminals. A lowpass filter is arranged in the input loop of the fowword rectifying and filtering power supply. The switch power supply device provided can be applicable is appratus such as color television and can solve the problem of incoming line rectifying main filtering capacitor failure or switch tube burnout when solder joint welding-off occurs.
Description
Technical field
The present invention relates to Switching Power Supply converter technique field, especially a kind of single-end flyback switching power supply.
Background technology
Switching Power Supply is many power supplys of present usefulness, is widely used in the electrical equipment of color television set etc.Present more common Switching Power Supply, as adopt UC3842, MC44608, TEA1507, the single-end flyback switching power supply that type pulse width modulator integrated circuits such as STRF6656 are connected into, in the primary structure of this class Switching Power Supply, an input rectifying filter circuit that is made of rectifier and filter capacitor is arranged, this current rectifying and wave filtering circuit with AC rectification filtering after, the output direct current is supplied with the elementary winding of a pulse transformer, and in the loop of this elementary winding, being in series with the switching tube (above-mentioned STRF6656 type pulse width modulator integrated circuit is integrated in circuit module with switching tube) that is used for regulating current pulse width, the turn-on and turn-off of this switching tube are then controlled by the pulse width modulator that above-mentioned several integrated circuits constitute.Find through long-term observation, the Switching Power Supply of these structures, main filter capacitor in the input rectifying filter circuit takes place in regular meeting, and dry or solder joint sealing-off causes the damage of switching tube because of electrolyte.The applicant is through test of many times and analysis; think that this filter capacitor is owing to be in the operating state of the big electric current of high frequency for a long time; rotten, temperature rise take place easily; electrolyte is dry to lose efficacy or the solder joint sealing-off thereby cause; when inlet wire rectification master filter capacitor lost efficacy or during the solder joint sealing-off, the circuit structure in existing scheme is failed timely and effective protection switch pipe, very easily burns switching tube and damages the pulse width modulator integrated circuit; cause serious economy loss, be difficult to sometimes repair.
Summary of the invention
Switching power unit provided by the invention, it is to be solved to be prior art can be burnt switching tube when inefficacy of inlet wire rectification master filter capacitor or solder joint sealing-off problem.
In order to address the above problem, the technical solution used in the present invention is: the switching tube that it includes rectifier filter, pulse transformer, pulse width modulator and is controlled by this pulse width modulator, and described pulse width modulator is by a normal shock rectification filtering power and an anti-sharp rectification filtering power power supply; The direct-flow input end of the winding terminal that positive pole connect of the rectifier cell of described normal shock rectification filtering power and the elementary winding of described pulse transformer is an end of the same name, is provided with low pass filter in the input circuit of this normal shock rectification filtering power; The winding terminal that positive pole connect of the rectifier cell of described anti-sharp rectification filtering power and the dc output end of the elementary winding of described pulse transformer are ends of the same name.Sort circuit setting can reduce the capacity to the filter capacitor of pulse width modulator power supply; when making inefficacy of inlet wire rectification master filter capacitor or solder joint sealing-off; the little energy that low valley point and capacitance stores are arranged because of the anti-supply voltage that swashs rectification filtering power output; deficiency is so that the continuous operate as normal of pulse width modulator and enter discontinuous operation; thereby limited the operating current of switching tube, the protection switch pipe is unlikely to overtemperature and burns.When the output load short circuits, the power supply energy that the normal shock rectification filtering power provides to pulse width modulator only can make the integrated circuit of pulse width modulator be in intermittently minimum power operating state, thereby limited the load short circuits output current, elements such as protection switch pipe are unlikely to overtemperature and burn; And this power supply anti-voltage that swashs rectification filtering power output when operate as normal is higher than the output voltage of normal shock rectification filtering power, and the output of normal shock rectification filtering power circuit is ended, and is powered to pulse width modulator by anti-sharp rectification filtering power.
Above-mentioned normal shock rectification filtering power can be made of described rectifier cell, the low pass filter and the pressurizer that are connected into by resistance and electric capacity; The negative pole of described rectifier cell is connected on the resistance of described low pass filter, and the input of described pressurizer then is connected on the positive voltage terminal of described low pass filter filter capacitor.Described pressurizer can be made of the semiconductor voltage stabilizing circuit that voltage stabilizing didoe and triode and biasing resistor are connected into.
Owing to adopted such scheme, the present invention compared with prior art has following beneficial effect:
1, the main filter capacitor of this switching power unit inlet wire lost efficacy or during the solder joint sealing-off, pulse width modulator can be in intermittently low-duty, and switching tube can be not overheated and damage, thereby protected switching tube.
2, this switching power unit is when output short-circuit, and pulse width modulator also is in intermittently minimum power operating state, thereby prevents to burn switching tube, and makes output short circuit current as far as possible little.
Description of drawings
Fig. 1 is the electric theory diagram that the present invention is used for television set embodiment.
Fig. 2 is the electrical schematic diagram of Fig. 1 embodiment.
Embodiment.
The invention will be further elaborated below in conjunction with the accompanying drawing example:
Shown in Figure 1, this switching power unit is made of the sample circuit of rectifier filter circuit, pulse transformer T, pulse-width modulation circuit, switching tube, normal shock rectification filtering power, anti-sharp rectification filtering power, voltage and the current rectifying and wave filtering circuit that is connected on the pulse transformer T output winding, alternating current is from the input of AC end, and direct current is from the output of B end.
Shown in Figure 2, alternating current is from the input of AC end, the rectifier filter that is connected into by fuse FU, rectifier D1, resistance R 1 and capacitor C 1, direct current after rectification exports the direct-flow input end of the elementary winding N1 of pulse transformer T to, the dc output end of elementary winding N1 is connected to one and is connected into switching circuit by switching tube Q1, resistance R 9 and capacitor C 8, the break-make of switching tube Q1 is controlled by the output signal of pulse width modulator, and pulse width modulator is connected into by UC3842 type pulse width modulator integrated circuit (IC) and resistance R 3～R9, RW1, capacitor C 3～C7, diode D3.The anti-sharp rectification filtering power that feedback winding N3, the diode D3 of pulse transformer T and capacitor C 3 constitute is as the elementary indirect sampled signal of pulse width modulator voltage stabilizing adjustment.Feedback winding N3, the diode D2 of pulse transformer T and capacitor C 2 constitute the anti-rectification filtering power that swashs, the positive pole of diode D2 connects the end of feedback winding N3 and the dc output end of the elementary winding N1 of pulse transformer T is an end of the same name, and this instead swashs rectification filtering power provides working power for pulse width modulator when this device operate as normal.When this supply unit starts in energising, provide power supply from two Zhi Luxiang pulse width modulators, the one tunnel is to provide by resistance R 2, and another road is to provide by a normal shock rectification filtering power.This normal shock rectification filtering power is the frame of broken lines part, be connected into by rectifier diode D4, resistance R 10～11, capacitor C 9, voltage stabilizing didoe DW1 and triode Q2, wherein the positive pole of rectifier diode D4 connects the end of the elementary winding N2 of pulse transformer T and the direct-flow input end of the elementary winding N1 of pulse transformer T is an end of the same name, and the negative pole of rectifier diode D4 is connected on by resistance R 11, capacitor C 9 to be formed on the resistance R 11 of low pass filter; Voltage stabilizing didoe DW1 and resistance R 10, triode Q2 form the semiconductor voltage stabilizer circuit, and its input then is connected on the positive voltage terminal of capacitor C 9.Resistance R 7, R8, C7 are over-current detection circuit.Pulse transformer T secondary winding N4 and diode D5, capacitor C 10 constitute the rectifying and wave-filtering output circuit, provide stabilized voltage power supply to load.
In foregoing circuit; capacitor C 9 capacity are as far as possible little; low-pass filtering resistance R 11 values are big as far as possible; can keep normal startup at the input voltage lower limit gets final product; capacitor C 2 capacity are also as far as possible little under the situation that guarantees normal startup; then the electric energy of electric capacity storage is few; when inlet wire master filter capacitor C1 inefficacy or sealing-off; output voltage of this switching power unit and feedback voltage all low valley point can occur; in low valley point place capacitor C 2; the system that C9 constitutes can't to the pulse width modulator integrated circuit (IC) provide can continuous operation electric energy; impel pulse width modulator to be in small-power discontinuous operation state, protected switching tube Q1 can overheatedly not burn.When load short circuits, the ON time of switching tube Q1 is extremely short, and being reflected on winding N1, the N2 is a high frequency short pulse, but R11, C9 low-pass filter circuit filtering high-frequency energy, and the auxiliary electric energy that provides to the integrated circuit (IC) of pulse width modulator is seldom.The R11 resistance value is big more, and the electric energy of the integrated circuit (IC) of supply pulse width modulator is just few more during short circuit, and the discontinuous operation time is just long more, and the short circuit current of output is just more little, and elements such as protection switch pipe are unlikely to overtemperature and burn.Capacitor C 9 values are 0.22 microfarad in the present embodiment, and resistance R 11 values are 100 ohm, and capacitor C 2 values are 2.2 microfarads.
The voltage stabilizing circuit that constitutes by resistance R 10, voltage-stabiliser tube DW1, triode Q2, output voltage values is near the minium operation voltage of pulse width modulator integrated circuit (IC), for pulse width modulator provides the assistant starting power supply when starting, when this switching power unit operate as normal since its output voltage be lower than and anti-the feedback voltage that feeds back winding N3 and provide is provided automatically shuts down output.
Claims (3)
1. switching power unit, it includes current rectifying and wave filtering circuit, pulse transformer, pulse width modulator, anti-swashs rectification filtering power by the switching tube of this pulse width modulator control and one to what described pulse width modulator provided power supply, it is characterized in that: described pulse width modulator is also by a normal shock rectification filtering power power supply, the direct-flow input end of the winding terminal that positive pole connect of the rectifier cell of this normal shock rectification filtering power and the elementary winding of described pulse transformer is an end of the same name, is provided with low pass filter in the input circuit of this normal shock rectification filtering power.
2. switching power unit according to claim 1 is characterized in that: described normal shock rectification filtering power is made of described rectifier cell, the low pass filter and the pressurizer that are connected into by resistance and electric capacity; The negative pole of described rectifier cell is connected on the resistance of described low pass filter, and described low pass filter filter capacitor is connected on the input of described pressurizer.
3. switching power unit according to claim 2 is characterized in that: described pressurizer can be made of the semiconductor voltage stabilizer circuit that voltage stabilizing didoe, triode and biasing resistor are connected into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610200236 CN101039072A (en) | 2006-03-14 | 2006-03-14 | Switching power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610200236 CN101039072A (en) | 2006-03-14 | 2006-03-14 | Switching power device |
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| Publication Number | Publication Date |
|---|---|
| CN101039072A true CN101039072A (en) | 2007-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610200236 Pending CN101039072A (en) | 2006-03-14 | 2006-03-14 | Switching power device |
Country Status (1)
| Country | Link |
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| CN (1) | CN101039072A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345482A (en) * | 2008-08-22 | 2009-01-14 | 戴俊 | Composite power supply |
| CN103036444A (en) * | 2011-09-30 | 2013-04-10 | 海洋王照明科技股份有限公司 | Voltage regulator circuit |
| CN106208716A (en) * | 2016-08-26 | 2016-12-07 | 深圳市华星光电技术有限公司 | Switching power circuit and Switching Power Supply |
| CN108322051A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of inverse-excitation type switch power-supply |
| CN109412421A (en) * | 2018-11-13 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of parallel operation circuit |
| CN109980901A (en) * | 2019-03-05 | 2019-07-05 | 合肥华耀电子工业有限公司 | A kind of auxiliary power supply circuit of wide input range power module |
| CN109995252A (en) * | 2019-04-22 | 2019-07-09 | 合肥惠科金扬科技有限公司 | A kind of voltage regulator circuit and switching power circuit |
| CN110601505A (en) * | 2018-09-26 | 2019-12-20 | 北京迪赛奇正科技有限公司 | Power supply circuit without auxiliary power supply |
| CN113037098A (en) * | 2021-04-30 | 2021-06-25 | 深圳市航嘉驰源电气股份有限公司 | Flyback switching power supply conversion circuit |
| CN115224920A (en) * | 2022-07-18 | 2022-10-21 | 深圳市晶源健三电子有限公司 | ASC high-voltage power supply system of 800V SiC motor controller |
-
2006
- 2006-03-14 CN CN 200610200236 patent/CN101039072A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345482A (en) * | 2008-08-22 | 2009-01-14 | 戴俊 | Composite power supply |
| CN101345482B (en) * | 2008-08-22 | 2015-04-29 | 戴俊 | Composite power supply |
| CN103036444A (en) * | 2011-09-30 | 2013-04-10 | 海洋王照明科技股份有限公司 | Voltage regulator circuit |
| CN106208716A (en) * | 2016-08-26 | 2016-12-07 | 深圳市华星光电技术有限公司 | Switching power circuit and Switching Power Supply |
| CN108322051A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of inverse-excitation type switch power-supply |
| CN110601505A (en) * | 2018-09-26 | 2019-12-20 | 北京迪赛奇正科技有限公司 | Power supply circuit without auxiliary power supply |
| CN109412421A (en) * | 2018-11-13 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of parallel operation circuit |
| CN109980901A (en) * | 2019-03-05 | 2019-07-05 | 合肥华耀电子工业有限公司 | A kind of auxiliary power supply circuit of wide input range power module |
| CN109980901B (en) * | 2019-03-05 | 2021-06-15 | 合肥华耀电子工业有限公司 | Auxiliary power supply circuit of wide input range power module |
| CN109995252A (en) * | 2019-04-22 | 2019-07-09 | 合肥惠科金扬科技有限公司 | A kind of voltage regulator circuit and switching power circuit |
| CN113037098A (en) * | 2021-04-30 | 2021-06-25 | 深圳市航嘉驰源电气股份有限公司 | Flyback switching power supply conversion circuit |
| CN115224920A (en) * | 2022-07-18 | 2022-10-21 | 深圳市晶源健三电子有限公司 | ASC high-voltage power supply system of 800V SiC motor controller |
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| WD01 | Invention patent application deemed withdrawn after publication |