CN200980044Y - A switch power supply circuit - Google Patents
A switch power supply circuit Download PDFInfo
- Publication number
- CN200980044Y CN200980044Y CN 200620016472 CN200620016472U CN200980044Y CN 200980044 Y CN200980044 Y CN 200980044Y CN 200620016472 CN200620016472 CN 200620016472 CN 200620016472 U CN200620016472 U CN 200620016472U CN 200980044 Y CN200980044 Y CN 200980044Y
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- triode
- circuit
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- utmost point
- switching power
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Abstract
The utility model discloses a switch power circuit, comprising a low-level and a sublevel, wherein the sublevel comprises a starting-up and standing-by switch circuit which comprises a resistance R645, a triode Q623 and a triode Q624, and a triode Q622 is connected between the triode Q623 and a resistance R637 which is connected with the C pole of the triode Q622 which e pole is connected with ground and b pole is connected with the C pole of the triode Q623, while the triode Q624 is a PNP triode. The switch power circuit of the utility model prevents the two triodes Q623 and Q624 connected directly via increasing the triodes, and makes the triode Q624 having no voltage difference between the electron collector and base electrode and in completely inactive state, and also provides the switch power circuit with instantly stable starting-up and standing-by switch circuit and low standing-by power.
Description
[technical field]
The utility model relates to Switching Power Supply, relates in particular to start, the standby commutation circuit of the Switching Power Supply of television set.
[background technology]
Power supply plays a part civil power is changed into the electric power that electrical equipment can use in electrical equipment, has energy loss when power supply is changed.A good power supply has higher conversion ratio, can save electric energy.But because the switching loss of Switching Power Supply self, the conversion ratio that improves power supply becomes difficult.
Existing switching power circuit comprises elementary and Switching Power Supply secondary of Switching Power Supply.Elementary fuse, linear filter, rectification, filter circuit, power supply switch tube and the power transformer of comprising of described switching power circuit.Described fuse element in machine changes and fuses when causing electric current excessive, the protection entire circuit.Interference, the spike of described linear filter filtering alternating current guarantee the alternating current of low pollution.Described rectification, filter circuit change civil power into direct current.The collaborative transformer of described power supply switch tube is secondary needed various direct currents with the power conversion of primary direct current, and some overvoltages, overcurrent, protection such as overheated are provided.Described power transformer is converted to secondary needed various DC power supply with the mapping mode of primary direct current by electricity, magnetic, electricity.
The secondary of elementary and Switching Power Supply of described switching power circuit is connected, elementary with Switching Power Supply, i.e. and the voltage of the left side of transformer transmission carries out forming DC power supply behind the rectifying and wave-filtering, is transferred to each part of TV inside.
Described elementary connection 220v power supply describedly secondaryly carries out other parts that alternating current after the transformation carries out the equipment that is transferred to behind the rectifying and wave-filtering to supply voltage,
Described switching power circuit secondary comprise start, standby commutation circuit ,+the 5V voltage stabilizing circuit ,+the 3.3V voltage stabilizing circuit.
See also Fig. 1, the start of existing switching power circuit, the standby commutation circuit comprises resistance R 145, Q623, R637, Q624, R639 and D626, described R145 is connected with a pin of power supply, the described secondary start that comprises, the standby commutation circuit and be connected with described circuit+the 5V voltage stabilizing circuit, + 3.3V voltage stabilizing circuit, described start, the standby commutation circuit comprises resistance R 645, triode Q623, triode Q624, described resistance R 645 is connected with the b utmost point of described triode Q623, is connected with described triode Q624 after the c utmost point of described triode Q623 is connected with resistance R 637.
When the television set operate as normal, low level of MCU POWER (start/standby) pin output, this level resistance R 145 of flowing through makes triode Q623 (2SC1815Y) be in complete cut-off state, the triode Q623 C utmost point is in high level, this high level makes that no-voltage is poor between triode Q624 (NPN) collector electrode and base stage, Q624 is in cut-off state, and the CPU operate as normal is needed+5V ,+the 3.3V operating voltage provides after by D622 (BA158), C625 (1000uF/16V) rectifying and wave-filtering.
During the television set stand-by operation, high level of MCU POWER pin output, this level R145 that flows through makes the Q623 saturation conduction, the Q623 C utmost point is in low level, this low level makes between Q624 collector electrode and base stage voltage difference, Q624 is in the saturation conduction state, (by providing when standby power is in intermittent oscillation after D621 (BA158) rectification, C622 (1000uF/50V) filtering, be about 3V by the voltage behind D622 (BA158), C625 (1000uF/16V) rectifying and wave-filtering this moment) about+12V is provided the voltage that Q624 C extremely goes up.Should+voltage (3V) behind 12V voltage and D622 (BA158), C625 (1000uF/16V) rectifying and wave-filtering separated by D626 (BA158), and the CPU stand-by operation is needed+5V ,+the 3.3V operating voltage provides after by D621 (BA158) rectification, C622 (1000uF/50V) filtering.
But, in the existing switching power circuit owing to only used two-stage open and close circuit, but, components and parts are being used and there are differences after all in theory, for example: triode Q623 (2SC1815Y) is in complete cut-off state when start, this is just theoretical, also having faint electric current in the practical application flows through, cause between triode Q624 (NPN) collector electrode and base stage small voltage difference is arranged, Q624 is in incomplete cut-off state, the difference that these are small just makes start, the standby commutation circuit moment instability of Switching Power Supply and standby power height.
[utility model content]
Technical problem to be solved in the utility model is, a kind of switching power circuit is provided, and solves existing switching power circuit instability, and the high problem of standby power.
The technical scheme that the utility model adopted is: provide a kind of switching power circuit to comprise primary and secondary, the described secondary start that comprises, the standby commutation circuit and be connected with described circuit+the 5V voltage stabilizing circuit, + 3.3V voltage stabilizing circuit, described start, the standby commutation circuit comprises resistance R 645, triode Q623, triode Q624, described resistance R 645 is connected with the b utmost point of described triode Q623, after being connected with resistance R 637, the c utmost point of described triode Q623 is connected with described triode Q624, also be connected with triode Q622 between described triode Q623 and the described resistance R 637, the C utmost point of described triode Q622 is connected with described resistance R 637, e utmost point ground connection, the b utmost point is connected with the C utmost point of described triode Q623; Described triode Q624 is the PNP pipe.
More specifically, also be connected with resistance R 635 between described triode Q622 and the described triode Q623, an end of described resistance R 635 is connected with the C utmost point of described triode Q623, and the other end is connected with the b utmost point of described triode Q622.
More specifically, described switching power circuit also comprises with described start, standby commutation circuit and being connected+the 5V voltage stabilizing circuit, described+5V voltage stabilizing circuit comprises resistance R 644, voltage stabilizing didoe ZD602 and capacitor C 117, one end of described voltage stabilizing didoe ZD602 and capacitor C 117 is connected the equal ground connection of the other end of described diode ZD602 and capacitor C 117 with described resistance R 644 after a node connects.
More specifically, described switching power circuit also comprises with described start, standby commutation circuit and being connected+the 3.3V voltage stabilizing circuit, described+3.3V voltage stabilizing circuit comprises resistance R 638, R711, triode Q650, voltage-stabiliser tube ZD602 and capacitor C 145, described resistance R 638 is connected with the c utmost point of described triode Q650, be connected with resistance R 711 between the c utmost point of described triode Q650 and the b utmost point, its e utmost point is connected with an end of capacitor C 145, its tie point is connected with the circuit of the needs+3.3V of television set inside, the other end ground connection of described capacitor C 145.
The utility model compared with prior art, beneficial effect is: the utility model switching power circuit has increased resistance R 635 and triode Q622 between triode Q623 and described resistance R 637, thereby adopted three grades to open, close circuit, make components and parts minimize influence circuit in the difference of using and exist in theory, for example: triode Q623 (2SC1815Y) is though there is faint electric current to flow through when standby, but also having resistance R 635 and triode Q622 to isolate Q623 is connected with the direct of Q624, make that no-voltage is poor between triode Q624 collector electrode and base stage, Q624 is in complete cut-off state.Realized that start, the standby commutation circuit moment in Switching Power Supply is stable, and the low circuit of standby power.
[description of drawings]
Fig. 1 is start, the standby commutation circuit schematic diagram in the existing switching power circuit.
Fig. 2 is a switching power circuit schematic diagram of the present utility model.
Fig. 3 is start, the standby commutation circuit schematic diagram in the switching power circuit of the present utility model.
Fig. 4 is in the switching power circuit of the present utility model+5V voltage stabilizing circuit schematic diagram.
Fig. 5 is in the switching power circuit of the present utility model+3.3V voltage stabilizing circuit schematic diagram.
[embodiment]
Switching power circuit of the present utility model comprises elementary and Switching Power Supply secondary of Switching Power Supply.Elementary fuse, linear filter, rectification, filter circuit, power supply switch tube and the power transformer of comprising of described switching power circuit.Described fuse element in machine changes and fuses when causing electric current excessive, the protection entire circuit.Interference, the spike of described linear filter filtering alternating current guarantee the alternating current of low pollution.Described rectification, filter circuit change civil power into direct current.The collaborative transformer of described power supply switch tube is secondary needed various direct currents with the power conversion of primary direct current, and some overvoltages, overcurrent, protection such as overheated are provided.Described power transformer is converted to secondary needed various DC power supply with the mapping mode of primary direct current by electricity, magnetic, electricity.
The secondary of elementary and Switching Power Supply of described Switching Power Supply is connected, elementary with Switching Power Supply, i.e. and the voltage of the left side of transformer transmission carries out forming DC power supply behind the rectifying and wave-filtering, is transferred to each part of TV inside.
Described elementary connection 220v power supply describedly secondaryly carries out other parts that alternating current after the transformation carries out the equipment that is transferred to behind the rectifying and wave-filtering to supply voltage,
As shown in Figure 2, described Switching Power Supply secondary comprise start, standby commutation circuit ,+the 5V voltage stabilizing circuit ,+the 3.3V voltage stabilizing circuit.
Described start, standby commutation circuit and described rectifying and wave-filtering are that the other end of the transformer of 12V and 48V is connected, and the standby of starting shooting is switched.
Described+5V voltage stabilizing circuit is connected with described start, stand-by circuit, gives CPU for stable, level and smooth 5V power supply.
Described+3.3V voltage stabilizing circuit is connected with described start, stand-by circuit, gives CPU for stable, level and smooth 3.3V power supply.
Described start, the standby commutation circuit comprises resistance R 145, triode Q623, resistance R 635, triode Q622, resistance R 637, triode Q624, resistance R 639 and diode D626, one end of described resistance R 645 is connected with power supply, the other end is connected with the b utmost point of triode Q623, one end of the described resistance R 635 of c utmost point desire of described triode Q623 connects, e utmost point ground connection, the other end of described resistance R 635 is connected with the b utmost point of described triode Q622, the e utmost point ground connection of described triode Q622, the c utmost point is connected with an end of described resistance R 637, the other end of described resistance R 637 is connected with the b utmost point of described triode Q624, the c utmost point of described triode Q624 is connected with the positive pole of described diode D626, and described resistance R 639 is connected with the e utmost point with the b utmost point of described triode.And described triode Q624 is the PNP pipe.
When the television set operate as normal, high level of POWER (power supply) pin output, this level resistance R 145 of flowing through makes triode Q623 (2SC1815Y) saturation conduction, the triode Q623 C utmost point is in low level, described low level makes triode Q622 (2SC1815Y) be in complete cut-off state, this moment, the C utmost point of triode Q622 was in high level, no-voltage is poor between Q624 (2SA1013) emitter and base stage, Q624 is in cut-off state, and the CPU operate as normal is needed+5V, + 3.3V operating voltage is by D622 (BA158), provide behind C625 (1000uF/16V) rectifying and wave-filtering.
When the television set holding state, low level of POWER pin output, this level R145 that flows through makes triode Q623 end fully, the triode Q623 C utmost point is in high level, this high level makes triode Q621 be in the saturation conduction state, triode Q621 (2SC1815Y) C utmost point low level, voltage stabilizing didoe ZD620 (3.3V voltage-stabiliser tube) is breakdown, this puncture voltage influences photoelectrical coupler IC622 (P621) primary current, make power supply enter the intermittent oscillation state, the secondary voltage of respectively exporting winding of power supply drops to about 1/3 of operate as normal respectively.
During the television set stand-by operation, low level of POWER pin output, this level resistance R 145 of flowing through makes triode Q623 end fully, the triode Q623 C utmost point is in high level, this high level makes triode Q622 be in the saturation conduction state, triode Q622 C utmost point low level, between triode Q624 emitter and base stage voltage difference is arranged, triode Q624 is in the saturation conduction state, the voltage that triode Q624 C extremely goes up is+12V about (by D621 (BA158) rectification, provide when standby power is in intermittent oscillation after capacitor C 622 (1000uF/50V) filtering, this moment is by diode D622 (BA158), voltage behind C625 (1000uF/16V) rectifying and wave-filtering is about 3V).Should+voltage (3V) behind 12V voltage and D622 (BA158), C625 (1000uF/16V) rectifying and wave-filtering separated by D626 (BA158), and the CPU stand-by operation is needed+5V ,+the 3.3V operating voltage provides after by D621 (BA158) rectification, C622 (1000uF/50V) filtering.
In order to accomplish stand-by power consumption, must reduce the reactive loss of unit, device as far as possible less than 1W.See also Fig. 4, of the present utility model+5V voltage stabilizing circuit+5V voltage stabilizing circuit comprises resistance R 644, diode ZD602 and capacitor C 117, one end of described voltage stabilizing didoe ZD602 and capacitor C 117 is connected the equal ground connection of the other end of described diode ZD602 and capacitor C 117 with described resistance R 644 after a node connects.When standby by provide after D621 (BA158) rectification, C622 (1000uF/50V) filtering+12V voltage through R644 (10K/1/6W) current limliting, ZD602 (5.1V voltage-stabiliser tube) voltage stabilizing after confession+5V give (being about 20mA) work such as EEPROM, infrared receiving terminal, the R644 here, ZD602 cost are about 0.1W than the saving of normal use L7805 three-terminal voltage-stabilizing pipe power consumption.
As shown in Figure 5, of the present utility model+3.3V voltage stabilizing circuit comprises resistance R 638, R711, triode Q650, voltage-stabiliser tube ZD602 and capacitor C 145, described resistance R 638 is connected with the c utmost point of described triode Q650, be connected with resistance R 711 between the c utmost point of described triode Q650 and the b utmost point, its e utmost point is connected with an end of capacitor C 145, and its tie point is connected with the circuit of the needs+3.3V of television set inside, the other end ground connection of described capacitor C 145.When standby by provide after D621 (BA158) rectification, C622 (1000UF/50V) filtering+12V voltage through confession+3.3V (45mA) behind R638 (22/2W) the current limliting R711 (510/1/6W), Q650 (2SC1815Y) ZD602 (3.9V voltage-stabiliser tube) voltage stabilizing, C145 filtering operating voltage during to the CPU standby.Should+saving of 3.3V voltage stabilizing circuit power consumption is about 0.1W.
Claims (4)
1, a kind of switching power circuit comprises primary and secondary, the described secondary start that comprises, the standby commutation circuit, described start, the standby commutation circuit comprises resistance R (645), triode Q (623), triode Q (624), described resistance R (645) is connected with the b utmost point of described triode Q (623), after being connected with resistance R (637), the c utmost point of described triode Q (623) is connected with described triode Q (624), it is characterized in that, also be connected with triode Q (622) between described triode Q (623) and the described resistance R (637), the C utmost point of described triode Q (622) is connected with described resistance R (637), e utmost point ground connection, the b utmost point is connected with the C utmost point of described triode Q (623); Described triode Q (624) is the PNP pipe.
2, switching power circuit as claimed in claim 1, it is characterized in that, also be connected with resistance R 635 between described triode Q (622) and the described triode Q (623), one end of described resistance R 635 is connected with the C utmost point of described triode Q (623), and the other end is connected with the b utmost point of described triode Q (622).
3, switching power circuit as claimed in claim 1, it is characterized in that, described switching power circuit also comprises with described start, standby commutation circuit and being connected+the 5V voltage stabilizing circuit, described+5V voltage stabilizing circuit comprises resistance R (644), voltage stabilizing didoe ZD602 and capacitor C (117), one end of described voltage stabilizing didoe ZD602 and capacitor C (117) is connected the equal ground connection of the other end of described voltage stabilizing didoe ZD602 and capacitor C (117) with described resistance R (644) after a node connects.
4, switching power circuit as claimed in claim 1, it is characterized in that, described switching power circuit also comprises and described start, the standby commutation circuit connects+and the 3.3V voltage stabilizing circuit is described+and the 3.3V voltage stabilizing circuit comprises resistance R (638), R (711), triode Q (650), voltage-stabiliser tube ZD602 and capacitor C (145), described resistance R (638) is connected with the c utmost point of described triode Q (650), be connected with resistance R (711) between the c utmost point of described triode Q (650) and the b utmost point, its e utmost point is connected with an end of capacitor C (145), its tie point is connected with the circuit of the needs+3.3V of television set inside, the other end ground connection of described capacitor C (145).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620016472 CN200980044Y (en) | 2006-12-14 | 2006-12-14 | A switch power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620016472 CN200980044Y (en) | 2006-12-14 | 2006-12-14 | A switch power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200980044Y true CN200980044Y (en) | 2007-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620016472 Expired - Fee Related CN200980044Y (en) | 2006-12-14 | 2006-12-14 | A switch power supply circuit |
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| Country | Link |
|---|---|
| CN (1) | CN200980044Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101587370B (en) * | 2008-05-23 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Auxiliary control circuit for booting computer |
| CN101510735B (en) * | 2008-10-24 | 2012-10-17 | 深圳创维－Rgb电子有限公司 | Energy-saving switch power supply with normal work and standby function |
| CN102111595B (en) * | 2009-12-29 | 2014-12-10 | 康佳集团股份有限公司 | Central processing unit (CPU) supply circuit equipment |
-
2006
- 2006-12-14 CN CN 200620016472 patent/CN200980044Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101587370B (en) * | 2008-05-23 | 2011-03-30 | 鸿富锦精密工业（深圳）有限公司 | Auxiliary control circuit for booting computer |
| CN101510735B (en) * | 2008-10-24 | 2012-10-17 | 深圳创维－Rgb电子有限公司 | Energy-saving switch power supply with normal work and standby function |
| CN102111595B (en) * | 2009-12-29 | 2014-12-10 | 康佳集团股份有限公司 | Central processing unit (CPU) supply circuit equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071121 Termination date: 20131214 |