CN102932998A - Power converter - Google Patents
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- CN102932998A CN102932998A CN201210453141XA CN201210453141A CN102932998A CN 102932998 A CN102932998 A CN 102932998A CN 201210453141X A CN201210453141X A CN 201210453141XA CN 201210453141 A CN201210453141 A CN 201210453141A CN 102932998 A CN102932998 A CN 102932998A
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- power supply
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- changeover device
- supply changeover
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- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 238000001914 filtration Methods 0.000 claims description 7
- 230000009977 dual effect Effects 0.000 abstract description 4
- 229910052736 halogen Inorganic materials 0.000 description 17
- 150000002367 halogens Chemical class 0.000 description 17
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The invention discloses a power converter. On the basis of an existing power converter circuit, a load characteristic match circuit is added, and meanwhile a dual voltage rectifying filter circuit and a constant-current output circuit are adopted. A current continuation circuit in the load characteristic match circuit enables an electronic transformer connected with the converter to maintain certain small current input when output of the electronic transformer is close to the lowest value. A current balance resistor in the load characteristic match circuit enables the electronic transformer to limit charging current in a filter capacitor in the dual voltage rectifying filter circuit when the electronic transformer outputs the alternating current peak value, and when the alternating current peak value outputted by the electronic transformer passes, certain charging current for the filter capacitor is maintained. By means of the load characteristic match circuit, the load characteristic of a light emitting diode (LED) lamp connected with the power converter is close to the load characteristic of the electronic transformer, and therefore the phenomena that LED spots are not lightened, flicker and are extremely low in brightness caused by the fact that the LED lamp is connected with the electronic transformer are avoided, and the power converter is applied to transformers of different types.
Description
Technical field
The invention belongs to the electric lighting technical field, relate to a kind of power supply changeover device and LED lamp, be specifically related to a kind of power supply changeover device for the switching led light source.
Background technology
Large power, electrically source converter in the market is that the low pressure of halogen lamp cup electronic transformer is exported the rectifying and wave-filtering that boosts, and carries out constant current again and drives, and powers to the high-powered LED lamp group.The patent No. is that 201090000531.6 utility model discloses a kind of power supply changeover device and a kind of LED lamp, its circuit comprises EMI filter circuit, voltage multiplying rectifier filter circuit and constant current output circuit, when the halogen lamp cup electronic transformer is exported the alternating current of 6V～12V, electric current forms voltage behind EMI filter circuit and voltage multiplying rectifier filter circuit be the direct current of input voltage more than 2 times, this direct current by constant current output circuit after again step-down be that the direct current of 6V～12V is supplied with the LED lamp.Because power supply changeover device and electronic transformer do not mate, namely the load characteristic of LED lamp is different from the load characteristic of electronic transformer, causes this quasi-driver when supporting the use with existing electronic transformer, understands that appearance point does not work, flicker, the extremely low phenomenon of brightness.
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention provides a kind of applicable dissimilar transformer, and overcome that traditional LED lamp appearance point does not work, the power supply changeover device of flicker, the extremely low phenomenon of brightness.
For solving the problems of the technologies described above, by the following technical solutions of the present invention:
A kind of power supply changeover device, this power supply changeover device is connected with prime transformer, rear class LED lamp group respectively, described power supply changeover device comprises voltage multiplying rectifier filter circuit, constant current output circuit, comprise two mutually filter capacitors of series connection in the described voltage multiplying rectifier filter circuit, the output of the low pressure of prime transformer is carried out constant current by constant current output circuit again and is driven the power supply of rear class LED lamp group through the voltage multiplying rectifier filter circuit rectifying and wave-filtering that boosts; This power supply changeover device also comprises the load characteristic match circuit that is comprised of electric current continuity circuit and current balance type resistance; Wherein, between the output that described electric current continuity circuit is arranged on the prime transformer and the input of voltage multiplying rectifier filter circuit, the alternating current that is used for the output of prime transformer keeps power supply changeover device that the input of certain electric current is arranged during near low ebb; Described current balance type resistance is connected with the input of described voltage multiplying rectifier filter circuit, restriction voltage multiplying rectifier filter circuit filter capacitor charging current when being used for alternating current in the output of prime transformer at peak value.
As improvement of the present invention, described electric current continuity circuit is made of full bridge rectifier, the 6th resistance, the 7th resistance, the 8th electric capacity.Be connected with two brachium pontis mid points of described full bridge rectifier after described the 6th resistance, the 7th resistance and the 8th electric capacity are parallel with one another.
As improvement of the present invention, the transformer that the input of described load characteristic match circuit connects is electronic transformer.
As improvement of the present invention, the transformer that the input of described load characteristic match circuit connects is linear transformer.
Further improve as the present invention, comprise two mutually filter capacitors of series connection in the described voltage multiplying rectifier filter circuit, described filter capacitor is electrochemical capacitor.
Further improve as the present invention, this power supply changeover device also comprises the rear utmost point filter capacitor that is connected in parallel on the constant current output circuit output.
The beneficial effect that the present invention has is:
On the basis of existing converter circuitry of power, input at the voltage multiplying rectifier filter circuit connects the load characteristic match circuit, electric current in this load characteristic match circuit continuity circuit can make electronic transformer during near low ebb, keep power supply changeover device that certain small electric stream input is arranged in output; The effect of the current balance type resistance in this load characteristic match circuit is to limit filter capacitor charging current in the voltage multiplying rectifier filter circuit when the alternating current peak value of electronic transformer output, do not allow the filter capacitor charging current excessive, the alternating current peak value past tense in electronic transformer output also can keep the charging current certain to filter capacitor like this.By electric current continuity circuit and the acting in conjunction of current balance type resistance, the load characteristic of the LED lamp that power supply changeover device connects is near the load characteristic of electronic transformer, thereby occur when avoiding LED lamp connecting electronic transformer that the LED point does not work, flicker, the extremely low phenomenon of brightness, make the power supply changeover device of this invention be applicable to dissimilar transformers.Filter capacitor adopts two jumbo electrochemical capacitor filtering in the voltage multiplying rectifier filter circuit, and this driver has the rear class filter capacitor simultaneously, under the filter action of dual large bulk capacitance, efficiently solves the stroboscopic problem of LED lamp.
Description of drawings
Fig. 1 is the power supply changeover device module map;
Fig. 2 is converter circuitry of power figure.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
Present embodiment is not change in the circuit wiring structure situation of former halogen lamp cup, utilizes the low pressure output of former halogen lamp cup electronic transformer to drive LED lamp group.This driver is that the output voltage of traditional halogen lamp cup electronic transformer is changed, and directly drives 1 ~ 5 great power LED.
As shown in Figure 2, a kind of power supply changeover device, this power supply changeover device are connected with prime Halogen Lamp Electronic Transformer, rear class LED lamp group respectively.Power supply changeover device comprises voltage multiplying rectifier filter circuit 10, constant current output circuit 20, comprise filter capacitor in the voltage multiplying rectifier filter circuit 10, the output of the low pressure of prime Halogen Lamp Electronic Transformer is carried out constant current by constant current output circuit 20 again and is driven the power supply of rear class LED lamp group through voltage multiplying rectifier filter circuit 10 rectifying and wave-filtering that boosts.This power supply changeover device also comprises the load characteristic match circuit 30 that is comprised of electric current continuity circuit 301 and current balance type resistance 302; Wherein, electric current continuity circuit 301 is arranged between the input of the output of prime Halogen Lamp Electronic Transformer and voltage multiplying rectifier filter circuit 10, the alternating current that is used for the output of prime Halogen Lamp Electronic Transformer keeps power supply changeover device that certain electric current input is arranged during near low ebb.Current balance type resistance 302 is connected with the input of described voltage multiplying rectifier filter circuit 10, the charging current of restriction voltage multiplying rectifier filter circuit filter capacitor when being used for alternating current in the output of prime Halogen Lamp Electronic Transformer at peak value.
The voltage multiplying rectifier filter circuit 10 of power supply changeover device is by diode D1, D2, D3, D4, and electrochemical capacitor C1, C2 and capacitor C 3 form.The anode of diode D1 is connected negative electrode and is jointly connected the first input end of this voltage multiplying rectifier filter circuit 10 with diode D4, the negative electrode of the anode of diode D2 and diode D3 connects the second input of this voltage multiplying rectifier filter circuit 10 jointly.Diode D1 negative electrode is connected negative electrode and is jointly connected the positive pole of electrochemical capacitor C2 and an end of capacitor C 3 with diode D2, diode D3 is connected anode and is extremely jointly connected the negative pole of electrochemical capacitor C1 and the other end of capacitor C 3 with diode D4.The positive pole of electrochemical capacitor C1 is connected negative pole and is jointly connected the second input of this voltage multiplying rectifier filter circuit 10 with electrochemical capacitor C2.The first output of voltage multiplying rectifier filter circuit 10 and the second output are connected to the two ends of capacitor C 3.Wherein, electrochemical capacitor C1, C2 capacity are 470uF, and withstand voltage is 35V.This circuit plays that alternating voltage to output carries out that multiplication of voltage is boosted, rectification and filter action.
The constant current output circuit 20 of power supply changeover device is that constant-current driven chip U1, resistance R 2, R3, R4, R5, capacitor C 5, inductance L 1, diode D5 and NPN type three utmost point Q1 pipes of XL8002 form by model.The 3rd pin of constant-current driven chip U1 links to each other with the end of resistance R 2, R3, connects simultaneously the first output of voltage multiplying rectifier filter circuit 10.The other end of the collector electrode contact resistance R3 of the Q1 of NPN type triode, the other end of the base stage contact resistance R2 of triode Q1 and the first pin of constant-current driven chip U1.The 4th pin that connects constant-current driven chip U1 behind the second pin of the emitter connection constant-current driven chip U1 of triode Q1 and the series capacitance C5.Resistance R 4, R5 are connected in parallel, one end of resistance R 4 connects the 5th pin of constant-current driven chip U1 and the negative electrode of diode D5, the other end of resistance R 4 connects an end of inductance L 1 and connects the 4th pin of constant-current driven chip U1, the other end of inductance L 1 connects the first output of constant current output circuit 10, the second output of the anodic bonding constant current output circuit of diode D5.
This power supply changeover device also comprises the rear utmost point filter capacitor C6 that is connected in parallel on driver output end; Should rear utmost point filter capacitor C6 be that capacity is 47uF, withstand voltage be the electrochemical capacitor of 50V.
As shown in Figure 2, load characteristic match circuit 30 comprises electric current continuity circuit 301 and current balance type resistance R 1.Electric current continuity circuit 301 is made of full bridge rectifier, resistance R 6, R7, capacitor C 8.Full bridge rectifier is comprised of diode D6, D7, D8, D9, the first input end of the anodic bonding load characteristic match circuit 30 of the negative electrode of diode D6 and diode D9; The second input of the anodic bonding load characteristic match circuit 30 of the negative electrode of diode D7 and diode D8.Resistance R 6, R7 and capacitor C 8 are connected in parallel between the negative electrode connected node of the anodic bonding node of diode D6, D7 of full bridge rectifier and diode D6, D7.
An end of current balance type resistance R 1 connects the first input end of this power supply changeover device in the load characteristic match circuit 30, and the other end of current balance type resistance R 1 connects the first input end of voltage multiplying rectifier filter circuit 10.
When this power supply changeover device input connects the high-frequency alternating current of Halogen Lamp Electronic Transformer output, behind the electric current process voltage multiplying rectifier filter circuit, go into the higher stable DC electricity of voltage and supply with constant current output circuit.The direct current of high voltage outputs to the LED lamp group two ends that are connected with power supply changeover device through becoming the burning voltage that adapts to LED work behind the constant-current driven chip.
Input at the voltage multiplying rectifier filter circuit connects load characteristic match circuit 30, electric current in this load characteristic match circuit 30 continuity circuit 301 can make the halogen lamp cup electronic transformer during near low ebb, keep power supply changeover device that certain small electric stream input is arranged in output.The effect of the current balance type resistance R 1 in this load characteristic match circuit 30 is to limit filter capacitor charging current in the voltage multiplying rectifier filter circuit 10 when the alternating current peak value of halogen lamp cup electronic transformer output, do not allow the filter capacitor charging current excessive, the alternating current peak value past tense in the output of halogen lamp cup electronic transformer also can keep the charging current certain to filter capacitor like this.Acting in conjunction by electric current continuity circuit 301 and current balance type resistance R 1, the load characteristic of the LED lamp that power supply changeover device connects is near the load characteristic of Halogen lamp LED, thereby occur when avoiding the LED Lamp cup to be used for halogen lamp cup that the LED point does not work, flicker, the extremely low phenomenon of brightness, make the power supply changeover device of this invention be applicable to dissimilar halogen lamp cups.Filter capacitor adopts the electrochemical capacitor filtering of 2 470uF in the voltage multiplying rectifier filter circuit 10, the filter capacitor of this driver output end parallel connection adopts the electrochemical capacitor filtering of 47uF, under the filter action of dual large bulk capacitance, efficiently solve the stroboscopic problem of LED Lamp cup.
The power supply changeover device that present embodiment provides is converted to first direct voltage with the high-frequency ac voltage of the output high voltage of electronic transformer, forming voltage after the step-down of step-down constant-current driven chip is the stable DC electricity of 0 ~ 20V, and the constant current driving force about 5 LEDs series connection 450mA is provided.This driver has 1 ~ 5 great power LED 450mA power greater than the constant current driving force of 7W, and has 1 ~ 5 great power LED constant current driving force and output short circuit protection function.
Power supply changeover device input of the present invention can also connect the linear transformer that output voltage is 5V-20V.
The above has done detailed description to embodiments of the present invention by reference to the accompanying drawings, but the present invention is not limited to above-mentioned execution mode, in the ken that those of ordinary skills possess, can also not break away under the prerequisite of aim of the present invention and make various variations.
Claims (6)
1. power supply changeover device, this power supply changeover device is connected with prime transformer, rear class LED lamp group respectively, described power supply changeover device comprises voltage multiplying rectifier filter circuit (10), constant current output circuit (20), comprise filter capacitor in the described voltage multiplying rectifier filter circuit (10), the output of the low pressure of prime transformer is carried out constant current by constant current output circuit (20) again and is driven the power supply of rear class LED lamp group through voltage multiplying rectifier filter circuit (10) rectifying and wave-filtering that boosts; It is characterized in that: this power supply changeover device also comprises the load characteristic match circuit (30) that is comprised of electric current continuity circuit (301) and current balance type resistance (302); Wherein, between the output that described electric current continuity circuit (301) is arranged on the prime transformer and the input of voltage multiplying rectifier filter circuit (10), the alternating current that is used for the output of prime transformer keeps power supply changeover device that the input of certain electric current is arranged during near low ebb; Described current balance type resistance (302) is connected with the input of described voltage multiplying rectifier filter circuit (10), the charging current of restriction voltage multiplying rectifier filter circuit filter capacitor when being used for alternating current in the output of prime transformer at peak value.
2. power supply changeover device according to claim 1 is characterized in that: described electric current continuity circuit (301) is made of full bridge rectifier, the 6th resistance (R6), the 7th resistance (R7), the 8th electric capacity (C8); Be connected with two brachium pontis mid points of described full bridge rectifier after described the 6th resistance (R6), the 7th resistance (R7) and the 8th electric capacity (C8) are parallel with one another.
3. power supply changeover device according to claim 1 is characterized in that: the transformer that the input of described load characteristic match circuit (30) connects is electronic transformer.
4. power supply changeover device according to claim 1 is characterized in that: the transformer that the input of described load characteristic match circuit (30) connects is linear transformer.
5. power supply changeover device according to claim 1 is characterized in that: comprise two mutually filter capacitors of series connection in the described voltage multiplying rectifier filter circuit (10), described filter capacitor is electrochemical capacitor.
6. power supply changeover device according to claim 1, it is characterized in that: this power supply changeover device also comprises the rear utmost point filter capacitor that is connected in parallel on constant current output circuit (20) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210453141.XA CN102932998B (en) | 2012-11-13 | 2012-11-13 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210453141.XA CN102932998B (en) | 2012-11-13 | 2012-11-13 | Power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102932998A true CN102932998A (en) | 2013-02-13 |
| CN102932998B CN102932998B (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210453141.XA Expired - Fee Related CN102932998B (en) | 2012-11-13 | 2012-11-13 | Power converter |
Country Status (1)
| Country | Link |
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| CN (1) | CN102932998B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105491722A (en) * | 2015-12-31 | 2016-04-13 | 吴文武 | LED autotransformer driver |
| CN107612371A (en) * | 2017-09-19 | 2018-01-19 | 杭州欧佩捷科技有限公司 | Full-bridge Capacitance Coupled inputs AC DC converters and its transform method |
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| US6700331B2 (en) * | 2002-06-05 | 2004-03-02 | Lusa Lighting, Inc. | Control circuit for dimming fluorescent lamps |
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| CN201398262Y (en) * | 2009-04-23 | 2010-02-03 | 深圳市兴皓地电子有限公司 | Drive circuit of low-voltage alternating current fluorescent lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107612371A (en) * | 2017-09-19 | 2018-01-19 | 杭州欧佩捷科技有限公司 | Full-bridge Capacitance Coupled inputs AC DC converters and its transform method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102932998B (en) | 2014-09-17 |
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Owner name: ZHENJIANG LEDIAN SEMICONDUCTOR TECHNOLOGY CO., LTD Free format text: FORMER OWNER: ZHENJIANG LUMINOUZ LIGHTING CO., LTD. Effective date: 20140808 |
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Effective date of registration: 20140808 Address after: 212127 Zhenjiang City, Jiangsu province Dantu District Valley Township Tower Road No. 3 Applicant after: Zhenjiang Le electricity semiconductor Science and Technology Ltd. Address before: 212009 Zhenjiang City, Jiangsu Province Economic Development Zone Five Road No. 2 Applicant before: Zhenjiang Luminouz Lighting Co., Ltd. |
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