CN1734915A - High performance switch power supply - Google Patents
High performance switch power supply Download PDFInfo
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- CN1734915A CN1734915A CN 200410051065 CN200410051065A CN1734915A CN 1734915 A CN1734915 A CN 1734915A CN 200410051065 CN200410051065 CN 200410051065 CN 200410051065 A CN200410051065 A CN 200410051065A CN 1734915 A CN1734915 A CN 1734915A
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Abstract
This invention belongs to high efficient switching power supply comprised a active power factor correction circuit, and a circuit device to realize high efficient switching power supply which comprises a rectification voltage division circuit, a comparator and its output drive circuit, a switching circuit, a active power factor correction circuit and its voltage division circuit on feedback input terminal; wherein, the rectification voltage division circuit detects input voltage and inputs the voltage variety into input terminal of comparator, the latter compares the detection result and reference voltage to control switching circuit to output correction voltage for active power factor correction circuit. The invention can increase the power supply efficiency on low AC condition.
Description
Technical field
The present invention relates to the Switching Power Supply of television set, especially for realizing that the Active Power Factor Correction rectifier output voltage follows AC-input voltage (hereinafter to be referred as the high efficiency switch power supply of Gai Bianing AC voltage).
Background technology
In existing television set Switching Power Supply, in order to improve the harmonic current interference of power supply to power supply unit, usually all used APFC (hereinafter to be referred as: APFC), the operating efficiency of APFC circuit is directly connected to the efficient of whole Switching Power Supply.
As everyone knows, the operating efficiency of APFC circuit is limit by its switching tube loss, thereby if will raise the efficiency, reduces switching loss and just seem very necessary.And switching loss is very big with the peak current relation that flows through the switching tube drain-source utmost point, and peak current is big, and the switching tube loss is big.
Referring to Fig. 1, in the Switching Power Supply of existing consumer electronics, the rectifier output voltage of APFC is designed to changeless, normally HV=400V ± 20V, when ac input voltage is higher for example more than the 140V, the voltage V of bridge rectifier output
InJust high, the peak current that flows through APFC energy storage inductor L is just little, and the peak current that flows through its drain-source utmost point when the switching tube conducting is in normal range (NR), and the switching tube own loss is little, the power-efficient height; When ac input voltage is lower than 140V, the voltage V of bridge rectifier output
InJust low, the peak current that flows through APFC energy storage inductor L is just big, and the peak current that flows through its drain-source utmost point when the switching tube conducting just heightens, and the switching tube own loss is just big, and power-efficient obviously reduces.At this moment, flow through switching tube electric current some become heat energy, owing to the encapsulation reason cause this part heat energy also to be difficult for distributing, its result not only causes the inefficiency of power supply, but also may cause the cause thermal damage of device.Problem hereto, the past, many researchers studied from different directions, but effect is not clearly.
In view of this, how to reduce the peak current that flows through the switching tube of APFC circuit when ac input voltage is low, self energy consumption that reduces switching tube just becomes emphasis of the present invention.
Summary of the invention
The purpose of this invention is to provide a kind of Switching Power Supply efficiently, this Switching Power Supply can keep high efficiency in wide input voltage range, under low AC voltage input, flow through the peak current of the switching tube drain-source utmost point of Switching Power Supply, thereby improve the efficient of power supply under low AC voltage input.
The present invention is achieved in that
A kind of Switching Power Supply efficiently, it includes existing APFC, it is characterized in that this Switching Power Supply also includes the circuit arrangement of realizing high efficiency Switching Power Supply, this circuit arrangement is by the rectification and voltage division circuit, comparator and output driving circuit thereof, switching circuit, bleeder circuit on APFC and the feedback input end thereof is formed, input voltage is by the rectification and voltage division electric circuit inspection, the change in voltage situation is input to the input of comparator, comparator compares this testing result and reference voltage, by its output driving circuit control switch circuit, adjust voltage again to APFC output.
Specifically, its circuit constitutes and act as:
The current rectifying and wave filtering circuit of AC-input voltage and dc voltage divider circuit thereof are used to detect the variation of AC-input voltage, and this variation are transferred to an input of comparator;
Comparator compares direct voltage on the above-mentioned input and the reference voltage on another input, and result relatively delivers to the control end of switching circuit by the output driving circuit of cascade, is used for the break-make of control switch circuit; Reference voltage, its value are decided by the preset value (normally preestablish minimum input voltage value) of AC-input voltage, and this preset value then is according to guaranteeing still that when AC-input voltage is low the principle that whole power supply has a High Power Factor determines;
Switching circuit, examined result's control is connected to circuit common with the resistance on the feedback end of APFC when its conducting;
APFC (APFC), the signal work of sending here according to said switching circuit, when monitoring the ac input voltage step-down, APFC will adjust rectifier output voltage to and ac input voltage corresponding horizontal this moment, the peak current of guaranteeing to flow through switching tube is constant big.
The course of work of the present invention is: power supply opening, be connected on the rectification and voltage division circuit on the AC-input voltage, the voltage division signal that directly reflects the AC-input voltage height is sent to comparison circuit, under predetermined ac input voltage, the comparison circuit upset, switching circuit work, APFC output voltage feedback control loop divider resistance changes, thereby make the APFC rectifier output voltage follow the AC-input voltage upset, and then raise the efficiency.
Described comparison circuit be voltage ratio, be the comparison of bleeder circuit and reference voltage, provide driving voltage to switching circuit.
Described rectification and voltage division circuit is current rectifying and wave filtering circuit and the dc voltage divider circuit thereof that comprises AC-input voltage;
In the above-mentioned rectification and voltage division circuit, diode D, capacitor C are formed the current rectifying and wave filtering circuit of AC-input voltage, directly are connected on the alternating current input power supplying.
In the above-mentioned rectification and voltage division circuit, by R
1, R
2Form bleeder circuit, be connected on the filter capacitor two ends of the current rectifying and wave filtering circuit of above-mentioned AC-input voltage, the direct voltage on it is carried out dividing potential drop.
Described comparator and drive circuit thereof are by integrated circuit (IC)
1Constitute comparison circuit and output driving circuit thereof, be connected to reference voltage V on its inverting input
Ref, V
RefNumerical value and the critical point of AC-input voltage (for example set critical voltage V
Ac=140V) corresponding, normal phase input end is accepted above-mentioned dc partial voltage signal, and output is received following switching circuit control input end, the break-make of control switch circuit.
Described switching circuit is made up of the divider resistance in switching tube and the APFC output voltage feedback loop, and after the switching tube conducting, pull down resistor in the APFC output voltage feedback loop reduces, and makes the APFC rectification be output as normal level (400VDC ± 20VDC).
Above-mentioned switching circuit is by low-power transistor Q1 and collector load resistor R thereof
5Constitute.R
5The other end be connected to APFC (APFC) IC
2Feedback input end FB.
Bleeder circuit behind the described APFC is by resistance R
3, R
4Constitute, be connected on the rectifier output voltage of APFC, will feed back to IC after its dividing potential drop
2Feedback input end FB, APFC regulates the duty ratio of its switch in view of the above, and is stable to keep its rectifier output voltage.
The present invention is by adjusting voltage to the APFC input, make it under voltage input value situation less than normal, can replenish voltage in right amount, make it keep normal voltage output, can make the peak current that flows through APFC energy storage inductor L remain state less than normal, the peak current that flows through its drain-source utmost point when the switching tube conducting can be in normal range (NR), and the switching tube own loss is little, the power-efficient height.
Actual proof, the positive effect of the present invention aspect raising the efficiency.For example, when AC-input voltage is 90V, during output 270W, measured data shows that it then is 92% that the present invention adopts the efficient of circuit.In addition, the amplitude that flows through the peak current of switching tube among the APFC almost differs one times.
Because the loss of switching tube is little among the APFC, heating just has been out of question, thereby has improved the reliability of device in the circuit.
Description of drawings
Fig. 1 is original APFC figure,
Fig. 2 is a circuit structure diagram of the invention process,
Fig. 3 is the peak current oscillogram of switching tube among original APFC,
The peak current oscillogram of switching tube among Fig. 4 APFC of the invention process.
Embodiment
As shown in Figure 2, the present invention increases partial circuit on the basis of original APFC, make the variation that it can automatically perception AC-input voltage, when this variation reaches a certain critical point, just its rectifier output voltage is adjusted to automatically a corresponding numerical value, thereby when guaranteeing that AC-input voltage changes in a very wide scope, the switching tube Q of APFC
2Peak current keep a more stable little amplitude, make Switching Power Supply remain high efficiency work.
Existing APFC does not improve, and no longer repeats at this.
The circuit that the invention process increased has: 1. rectification and voltage division circuit; 2. comparison circuit; 3. switching circuit.The formation of each circuit and connect as follows:
1. rectification and voltage division circuit
This rectification and voltage division circuit comprises current rectifying and wave filtering circuit and two parts of bleeder circuit again, forms the current rectifying and wave filtering circuit of AC-input voltage by diode D, capacitor C, directly is connected on the alternating current input power supplying;
By R
1, R
2Form bleeder circuit, be connected on the filter capacitor two ends of the current rectifying and wave filtering circuit of above-mentioned AC-input voltage, the direct voltage on it is carried out dividing potential drop;
2. comparison circuit
By integrated circuit (IC)
1Constitute comparison circuit (being comparator) and output driving circuit thereof, be connected to reference voltage V on its inverting input
Ref, V
RefNumerical value and the critical point of AC-input voltage (for example set critical voltage V
Ac=140V) corresponding, normal phase input end is accepted above-mentioned dc partial voltage signal, and output is received following switching circuit control input end, the break-make of control switch circuit.
3. switching circuit
By low-power transistor Q
1And collector load resistor R
5Constitute.R
5The other end be connected to APFC (APFC) IC
2Feedback input end FB.
The present invention implements also to need bleeder circuit, so that APFC is stably worked:
Bleeder circuit
Be by resistance R
3, R
4Constitute, be connected on the rectifier output voltage of APFC, will feed back to IC after its dividing potential drop
2Feedback input end FB, APFC regulates the duty ratio of its switch in view of the above, and is stable to keep its rectifier output voltage.
Component parameter among Fig. 1, model are as shown in the table
| Code name | IC 1 | IC 2 | Q 1 | D | C | R 1 | R 2 | R 3 | R 4 | R 5 |
| Parameter or model | LM 393 | NCP 1650 | 2N 7002 | 1N 4007 | 2.2Uf /400V | 560K | 6.8K | 900K | 18K | 20K |
The course of work of this circuit is as follows.Power supply opening is connected on the rectification and voltage division circuit on the AC-input voltage, will directly reflect the voltage division signal of AC-input voltage height be sent to the normal phase input end of comparison circuit, with the reference voltage V of the inverting input of comparison circuit
RefCompare, at selected V
RefDuring=4V, the critical value V of corresponding AC-input voltage
Ac=140V, when AC-input voltage reaches this predetermined value, the comparison circuit upset, switching circuit work is with the resistance R on the FB end of APFC
5Other end ground connection, the divider resistance of the output voltage feedback control loop of APFC changes, APFC readjusts the duty ratio of its switching tube, make rectifier output voltage be reduced to present 250V ± 50V, so as not to the switching tube Q that causes flowing through APFC because of the pressure reduction that is added in the APFC two ends is excessive from original 400VDC ± 20VDC
2The peak current of (see figure 1) increases, so, and Q
2Be unlikely to extra loss to occur, thereby improve the operating efficiency of Switching Power Supply under low input.
In addition, comparison diagram 3 and Fig. 4, the amplitude that flows through the peak current of switching tube among the APFC as can be seen almost differs one times.Fig. 3 is the peak current oscillogram of switching tube among original APFC, about 10 lattice of amplitude; Fig. 4 is the peak current oscillogram of switching tube among the APFC of the present invention, about 5 lattice of amplitude.
Because the loss of switching tube is little among the APFC, heating just has been out of question, thereby has improved the reliability of device in the circuit.
Claims (11)
1, a kind of Switching Power Supply efficiently, it includes existing APFC, it is characterized in that this Switching Power Supply also includes the circuit arrangement of realizing high efficiency Switching Power Supply, this circuit arrangement is by the rectification and voltage division circuit, comparator and output driving circuit thereof, switching circuit, bleeder circuit on APFC and the feedback input end thereof is formed, input voltage is by the rectification and voltage division electric circuit inspection, the change in voltage situation is input to the input of comparator, comparator compares this testing result and reference voltage, by its output driving circuit control switch circuit, adjust voltage again to APFC output.
2, Switching Power Supply efficiently as claimed in claim 1 is characterized in that:
The current rectifying and wave filtering circuit of AC-input voltage and dc voltage divider circuit thereof are used to detect the variation of AC-input voltage, and this variation are transferred to an input of comparator;
Comparator compares direct voltage on the above-mentioned input and the reference voltage on another input, and result relatively delivers to the control end of switching circuit by the output driving circuit of cascade, is used for the break-make of control switch circuit;
Switching circuit, examined result's control is connected to circuit common with the resistance on the feedback end of APFC when its conducting;
APFC, according to the signal work that said switching circuit is sent here, when monitoring the AC-input voltage step-down, APFC will be adjusted rectifier output voltage and arrive and AC-input voltage corresponding horizontal this moment.
3, Switching Power Supply efficiently as claimed in claim 1, it is characterized in that power supply is connected on the rectification and voltage division circuit on the AC-input voltage, the voltage division signal that directly reflects the AC-input voltage height is sent to comparison circuit, under predetermined AC-input voltage, the comparison circuit upset, switching circuit work, APFC output voltage feedback control loop divider resistance changes, and the APFC rectifier output voltage is followed the AC-input voltage upset.
4, Switching Power Supply efficiently as claimed in claim 1, it is characterized in that described comparison circuit be voltage ratio, be the comparison of bleeder circuit and reference voltage, provide driving voltage to switching circuit.
5, Switching Power Supply efficiently as claimed in claim 1 is characterized in that described rectification and voltage division circuit is current rectifying and wave filtering circuit and the dc voltage divider circuit thereof that comprises AC-input voltage.
6, Switching Power Supply efficiently as claimed in claim 5 is characterized in that in the above-mentioned rectification and voltage division circuit, and diode D, capacitor C are formed the current rectifying and wave filtering circuit of AC-input voltage, directly are connected on the alternating current input power supplying.
7, Switching Power Supply efficiently as claimed in claim 6 is characterized in that in the above-mentioned rectification and voltage division circuit, by R
1, R
2Form bleeder circuit, be connected on the filter capacitor two ends of the current rectifying and wave filtering circuit of above-mentioned AC-input voltage, the direct voltage on it is carried out dividing potential drop.
8, Switching Power Supply efficiently as claimed in claim 1 is characterized in that described comparator and drive circuit thereof are by integrated circuit (IC)
1Constitute comparison circuit and output driving circuit thereof, be connected to reference voltage V on its inverting input
Ref, V
RefNumerical value corresponding with the critical point of AC-input voltage, normal phase input end is accepted above-mentioned dc partial voltage signal, output is received following switching circuit control input end, the break-make of control switch circuit.
9, Switching Power Supply efficiently as claimed in claim 1 is characterized in that described switching circuit is made up of the divider resistance in switching tube and the APFC output voltage feedback loop.
10, Switching Power Supply efficiently as claimed in claim 9 is characterized in that above-mentioned switching circuit is by low-power transistor Q
1And collector load resistor R
5Constitute.R
5The other end be connected to APFC IC
2Feedback input end FB.
11, Switching Power Supply efficiently as claimed in claim 10 is characterized in that the bleeder circuit behind the described APFC is by resistance R
3, R
4Constitute, be connected on the rectifier output voltage of APFC, will feed back to IC after its dividing potential drop
2Feedback input end FB, APFC is regulated the duty ratio of its switch in view of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051065 CN1734915B (en) | 2004-08-13 | 2004-08-13 | Switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051065 CN1734915B (en) | 2004-08-13 | 2004-08-13 | Switch power supply |
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| Publication Number | Publication Date |
|---|---|
| CN1734915A true CN1734915A (en) | 2006-02-15 |
| CN1734915B CN1734915B (en) | 2010-05-26 |
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ID=36077160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410051065 Expired - Fee Related CN1734915B (en) | 2004-08-13 | 2004-08-13 | Switch power supply |
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| Country | Link |
|---|---|
| CN (1) | CN1734915B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795039A (en) * | 2014-02-14 | 2014-05-14 | 苏州佳世达电通有限公司 | Power adapter and capacitor protection device thereof |
| CN104467746A (en) * | 2014-12-09 | 2015-03-25 | 中国航空工业集团公司第六三一研究所 | Duty ratio adjusting method and circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2595063Y (en) * | 2003-01-06 | 2003-12-24 | 李善根 | Active power factor corrector with low cost |
| CN2595110Y (en) * | 2003-01-24 | 2003-12-24 | 于晓平 | Factor corrector for color TV-set switch power supply |
-
2004
- 2004-08-13 CN CN 200410051065 patent/CN1734915B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795039A (en) * | 2014-02-14 | 2014-05-14 | 苏州佳世达电通有限公司 | Power adapter and capacitor protection device thereof |
| CN103795039B (en) * | 2014-02-14 | 2017-01-25 | 苏州佳世达电通有限公司 | Power adapter and capacitor protection device thereof |
| CN104467746A (en) * | 2014-12-09 | 2015-03-25 | 中国航空工业集团公司第六三一研究所 | Duty ratio adjusting method and circuit |
| CN104467746B (en) * | 2014-12-09 | 2017-04-05 | 中国航空工业集团公司第六三一研究所 | A kind of dutycycle method of adjustment and circuit |
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| Publication number | Publication date |
|---|---|
| CN1734915B (en) | 2010-05-26 |
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Owner name: SHENZHEN TCL NEW TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: TCL KING ELECTRICAL APPLIANCES (SHENZHEN) CO., LTD. Effective date: 20110212 |
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