CN201608944U - Switch power supply without electrolytic capacitor - Google Patents
Switch power supply without electrolytic capacitor Download PDFInfo
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- CN201608944U CN201608944U CN2010201090587U CN201020109058U CN201608944U CN 201608944 U CN201608944 U CN 201608944U CN 2010201090587 U CN2010201090587 U CN 2010201090587U CN 201020109058 U CN201020109058 U CN 201020109058U CN 201608944 U CN201608944 U CN 201608944U
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Abstract
Disclosed is a switch power supply without electrolytic capacitors, comprising a primary side circuit and a secondary side circuit, two side circuits are isolated by a transformer coil T1. The primary side circuit comprises an AC-DC transfer circuit Vg, an energy storage inductor L1, a blocking capacitor C1a and a switching tube, current which is output from the Vg is passed through a return circuit which is formed by the primary side of the L1, the C1a and the T1 in a way of being connected with each other in series. An input end and an output end of the switching tube Q1 are respectively connected at the rear end of the L1 and the T1. A control end of the Q1 is connected with a control circuit of the switching tube. The secondary side circuit is a constant current control circuit. The technical proposal has the advantages that the current stability is very good, ripple wave is extremely small, the control accuracy is high, the service life of a LED is prolonged greatly. The power supply can achieve the requirement of a high performance power supply without adding extra cost, in addition, the anti-interference ability is extremely strong. The switch power supply without the electrolytic capacitors is a break-through of the switch power supply design in the LED lighting industry and is a revolutionary promotion for the industry.
Description
Technical field
The utility model belongs to the switch power technology field, specifically is the no electrolytic capacitor Switching Power Supply.
Background technology
1, the advantage of LED illumination is very obvious:
(1) save the energy: same illumination, can save the electric energy more than 60%, for the occasion of high-power illumination,,, can reach the brightness of the above common sodium vapor lamp of 250W especially with the LED lamp of 120W as city street lamp, Tunnel Lamp etc.
(2) environmental protection, unharmful substance.
(3) life-span long, use continuously under the suitable situation of condition of work can reach more than 50000 hours the longest reaching more than 100000 hours, normal useful life more than 10 years, and the general lighting product has only 2-3 useful life.
2, the subject matter of LED illumination:
(1) the LED illumination need provide constant DC stream, because the life-span that conference significantly reduces LED is spent in current fluctuation, this has the Current Control of more stable and degree of precision with regard to the power supply that requires to power.
(2) the LED illumination need be by long-life, the power supply of powerful Switching Power Supply.Though the LED product is a lot of on the market at present, the life-span of the LED lamp power supply that most outdoor lightings are used can only reach about 2 years, did not match with normal useful life of LED.Its basic reason is:
A, high power switching power supply will reach higher voltage stabilizing/constant current accuracy, need the electrochemical capacitor (elementary and secondary) of larger capacity, are difficult to the capacity that reaches big as if the electric capacity with other classifications; Promptly enable the capacity that reaches same, its volume also is huge incomparable, and cost is extremely expensive.
The continuous operation temperature rise under the big situation of power of B, Switching Power Supply is higher, the heat radiation of LED itself also can be transmitted heat and be given Switching Power Supply in addition, when the summer outdoor application, electrochemical capacitor can lose efficacy because of the evaporation gradually of its electrolyte, and general electrochemical capacitor is only 2000-3000 hour useful life when 85C.
(3), LED electric consumption on lighting source generally all required power coefficient to adjust circuit, the constant voltage circuit and the constant-current circuit that need after adding, circuit cost is very high, and the life-span is limited, so seriously restricted the development of high-power LED illumination industry.
In the prior art, general by strengthening the design margin life-saving of electrochemical capacitor.Because it is sooner or later thing that the evaporation of electrolyte makes electrochemical capacitor lose function, so life-span and reality that the method by Theoretical Calculation estimates often have very big-difference.And,, also can influence overall performance even system can work along with the amount of electrolyte reduces, cause the LED life-span to reduce even damage.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the utility model proposes a kind of new LED illumination that is used for and wait more powerful power supply, concrete technical scheme is as follows:
A kind of no electrolytic capacitor Switching Power Supply comprises primary-side circuitry and secondary-side circuitry, and two lateral circuits are isolated by transformation coil T1; Primary-side circuitry comprises ac-dc conversion circuit Vg, energy storage inductor L1, capacitance C1a and switching tube, the loop that electric current process L1, the C1a of described Vg output and the primary side of T1 are followed in series to form, the input and output side of described switching tube Q1 is connected in the rear end of L1 and the rear end of T1 respectively; The control end of described Q1 connects the switch controlled circuit; Described secondary-side circuitry is a constant-current control circuit.
Described constant-current control circuit comprises capacitance C1b, energy storage inductor L2 and load resistance R; Secondary side current process C1b, the L2 of described T1 and the loop that R is connected in series successively and constitutes; The two ends of described R are "+" and "-" output stage of Switching Power Supply; Be connected with diode D1 and capacitance C2 between "-" output stage of the input of described L2 and output and Switching Power Supply respectively; The anode of described D1 connects "-" output stage of Switching Power Supply.
Described switch controlled circuit is that to adjust chip PFC with power factor be the circuit of main control chip, and the voltage of "+" and "-" output stage of this main control chip receiving key power supply and the current parameters of primary side are controlled the duty cycle of switching of Q1 with this.Described main control chip also receives from external control signal.
Described C1a, C1b are thin-film capacitor (compare with common electric capacity, the capacity of thin-film capacitor are less) with C2.The shared same iron core of described L1 and L2.
Principle explanation of the present utility model:
1, a kind of topological structure, be used for LED illumination than large power supply, the characteristics of this topological structure are to utilize power coefficient to adjust circuit as main control, add constant-current control circuit.
2, the topological structure of circuit: isolate cuk converter (Isolated CUK Converter):
(1) this topological structure utilizes L1, L2 inductive energy storage to substitute capacitance energy storage, therefore can use very capacitor C 1a, C1b, the C2 of low capacity, and the function of electric capacity mainly has been the effect that prevents current oscillation.
For example, the street lamp of a 150W is generally 100uF/450V with the elementary electric capacity of Switching Power Supply, and secondary capacitance is generally two 680uF/63V (48V output).And the C1a of this new design, C1b only are 1uF/630V, and general thin electric capacity can meet the demands.
(2) because the characteristics of inductance itself are perfectly straight stream, resistance exchanges, under a certain constant load, and this structure input, output ripple is very little.
(3) to be used for LED illumination be a kind of ideal scheme to this structure, because the LED illumination itself is exactly a kind of constant load, not wishing has big fluctuation, and the LED light modulation also is a kind of slow variation, does not have the load of frequent moment sudden change.
(4) this structure utilizes PFC (power factor adjustment chip) as main control chip, both to realize the power factor adjustment.Having realized the power supply of steady load again, is a kind of perfect combination.Owing to be that continuous mode (CCM) sort circuit can provide stable electric current to the LED lighting load to greatest extent, improved the life-span of LED greatly and driven efficient.
(5) the strong EMC performance of this electric current antijamming capability is good
(6) this circuit is because poor for the fluctuating load adjustment capability, uses for the stabilized voltage power supply of general application to be not suitable for, so few the application.
The advantage of the technical program comprises:
A, current stability are very good, and ripple is minimum, and the control precision height prolongs life-span of LED greatly.
B, need not jumbo electrochemical capacitor storage power, but adopt inductive energy storage,, can reach the life-span more than 10 years, satisfy the demand that LED throws light on fully so can power supply be increased following useful life greatly at high-temperature condition with the thin-film capacitor of common low capacity.
C, this design utilize power factor correction circuit (PFC) as the control core, make power supply not need additionally to increase the requirement that cost can reach the high-performance power supply, and antijamming capability are extremely strong.
D, the technical program are a kind of breakthroughs of LED illuminating industry Switching Power Supply design, are a kind of revolutionary promotions for the sector, have solved the headache problem in many years of puzzlement the sector.
Description of drawings
Fig. 1 is a principle topological diagram of the present utility model;
Fig. 2 is an embodiment circuit diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment
In conjunction with Fig. 1, a kind of no electrolytic capacitor Switching Power Supply comprises primary-side circuitry and secondary-side circuitry, and two lateral circuits are isolated by transformation coil T1; Primary-side circuitry comprises ac-dc conversion circuit Vg, energy storage inductor L1, capacitance C1a and switching tube, the loop that electric current process L1, the C1a of described Vg output and the primary side of T1 are followed in series to form, the input and output side of described switching tube Q1 is connected in the rear end of L1 and the rear end of T1 respectively; The control end of described Q1 connects the switch controlled circuit; Described secondary-side circuitry is a constant-current control circuit.
Described constant-current control circuit comprises capacitance C1b, energy storage inductor L2 and load resistance R; Secondary side current process C1b, the L2 of described T1 and the loop that R is connected in series successively and constitutes; The two ends of described R are "+" and "-" output stage of Switching Power Supply; Be connected with diode D1 and capacitance C2 between "-" output stage of the input of described L2 and output and Switching Power Supply respectively; The anode of described D1 connects "-" output stage of Switching Power Supply.
Described switch controlled circuit is that to adjust chip PFC with power factor be the circuit of main control chip, and the voltage parameter of "+" and "-" output stage of this main control chip receiving key power supply and the current parameters of primary side are controlled the duty cycle of switching of Q1 with this.Described main control chip also receives from external control signal.
Described C1a, C1b and C2 are thin-film capacitors.The shared same iron core of described L1 and L2.
In conjunction with Fig. 2, in this example, described PFC selects 1CE2PCS01G for use.The function of above-mentioned C2 is made of C6 and C7 parallel connection as required.The voltage acquisition port VSENSE of 1CE2PCS01G isolates by photoelectricity that ICU2 gathers the voltage of output and from the control signal (being pwm signal) of outside; Current acquisition port ISENSE gathers the current signal of primary side.PFC adjusts the duty cycle of switching of Q1, if phenomenons such as short circuit are directly closed Q1. according to these signals.
Claims (6)
1. a no electrolytic capacitor Switching Power Supply comprises primary-side circuitry and secondary-side circuitry, and two lateral circuits are isolated by transformation coil T1; It is characterized in that primary-side circuitry comprises ac-dc conversion circuit Vg, energy storage inductor L1, capacitance C1a and switching tube, the loop that electric current process L1, the C1a of described Vg output and the primary side of T1 are followed in series to form, the input and output side of described switching tube Q1 is connected in the rear end of L1 and the rear end of T1 respectively; The control end of described Q1 connects the switch controlled circuit; Described secondary-side circuitry is a constant-current control circuit.
2. Switching Power Supply according to claim 1 is characterized in that described constant-current control circuit comprises capacitance C1b, energy storage inductor L2 and load resistance R; Secondary side current process C1b, the L2 of described T1 and the loop that R is connected in series successively and constitutes; The two ends of described R are "+" and "-" output stage of Switching Power Supply; Be connected with diode D1 and capacitance C2 between "-" output stage of the input of described L2 and output and Switching Power Supply respectively; The anode of described D1 connects "-" output stage of Switching Power Supply.
3. Switching Power Supply according to claim 1 and 2, it is characterized in that described switch controlled circuit is that to adjust chip PFC with power factor be the circuit of main control chip, the voltage of "+" and "-" output stage of this main control chip receiving key power supply and the current parameters of primary side are controlled the duty cycle of switching of Q1 with this.
4. Switching Power Supply according to claim 3 is characterized in that described main control chip also receives from external control signal.
5. Switching Power Supply according to claim 2 is characterized in that the shared same iron core of described L1 and L2.
6. Switching Power Supply according to claim 2 is characterized in that described C1a, C1b and C2 are the thin-film capacitors of low capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201090587U CN201608944U (en) | 2010-02-05 | 2010-02-05 | Switch power supply without electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201090587U CN201608944U (en) | 2010-02-05 | 2010-02-05 | Switch power supply without electrolytic capacitor |
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| Publication Number | Publication Date |
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| CN201608944U true CN201608944U (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201090587U Expired - Lifetime CN201608944U (en) | 2010-02-05 | 2010-02-05 | Switch power supply without electrolytic capacitor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102123552A (en) * | 2011-01-28 | 2011-07-13 | 重庆大学 | Multi-path constant-current high-power LED (Light-Emitting Diode) driving power supply |
| CN102413609A (en) * | 2011-11-04 | 2012-04-11 | 王坤 | Low-power illuminating system with LED (light-emitting diode) lamps |
| CN102573194A (en) * | 2010-12-30 | 2012-07-11 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit |
| CN104967304A (en) * | 2015-03-12 | 2015-10-07 | 华南理工大学 | Bridgeless CUK isolation type three-phase power factor correction converter |
| CN108012370A (en) * | 2017-11-22 | 2018-05-08 | 中山市深力卓光电科技有限公司 | The LED drive power of no electrolytic capacitor |
-
2010
- 2010-02-05 CN CN2010201090587U patent/CN201608944U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573194A (en) * | 2010-12-30 | 2012-07-11 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit |
| CN102123552A (en) * | 2011-01-28 | 2011-07-13 | 重庆大学 | Multi-path constant-current high-power LED (Light-Emitting Diode) driving power supply |
| CN102123552B (en) * | 2011-01-28 | 2013-08-07 | 重庆大学 | Multi-path constant-current high-power LED (Light-Emitting Diode) driving power supply |
| CN102413609A (en) * | 2011-11-04 | 2012-04-11 | 王坤 | Low-power illuminating system with LED (light-emitting diode) lamps |
| CN102413609B (en) * | 2011-11-04 | 2013-11-13 | 王坤 | Low-power illuminating system with LED (light-emitting diode) lamps |
| CN104967304A (en) * | 2015-03-12 | 2015-10-07 | 华南理工大学 | Bridgeless CUK isolation type three-phase power factor correction converter |
| CN104967304B (en) * | 2015-03-12 | 2018-04-13 | 华南理工大学 | One kind is based on no bridge CUK isolated form Three Phase Power Factor Correction Converters |
| CN108012370A (en) * | 2017-11-22 | 2018-05-08 | 中山市深力卓光电科技有限公司 | The LED drive power of no electrolytic capacitor |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20101013 |
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| CX01 | Expiry of patent term |