CN203278658U - Switch power supply circuit - Google Patents
Switch power supply circuit Download PDFInfo
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- CN203278658U CN203278658U CN201320285160.6U CN201320285160U CN203278658U CN 203278658 U CN203278658 U CN 203278658U CN 201320285160 U CN201320285160 U CN 201320285160U CN 203278658 U CN203278658 U CN 203278658U
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- 238000004804 winding Methods 0.000 claims abstract description 55
- 238000001914 filtration Methods 0.000 claims abstract description 44
- 239000011324 bead Substances 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 48
- 230000006698 induction Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The utility model discloses a switch power supply circuit which comprises a DC input terminal, a transformer, a first rectification filtering module, a second rectification filtering module, a first voltage output terminal, a second voltage output terminal, a switch control chip and a magnetic bead, wherein the principal winding of the transformer is connected between the DC input terminal and the drain end of the switch control chip, a first secondary winding and a second secondary winding of the transformer are correspondingly connected with the first rectification filtering module and the second rectification filtering module, and the magnetic bead is sleeved over the source end of the switch control chip or connected between the source end and the ground. In the switch power supply circuit, the magnetic bead is sleeved over the source end of the switch control chip or connected between the source end and the ground. The magnetic bead filters high frequency current signals generated after direct current flows through the principal winding of the transformer to suppress interference, thereby ensuring the operation safety and reliability of the switch power supply circuit and electrical appliances connected on a power grid.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of switching power circuit.
Background technology
In recent years, because China and European Union etc. are national to household electrical appliances, particularly the stand-by power consumption of air-conditioning there is strictly restriction, stand-by power consumption requires less than 1W, so conventional linearity (power frequency) transformer can not meet the demands, the conversion efficiency of general linear transformer only has 40% to 60%, and stand-by power consumption is generally 4W, the stand-by power consumption of the linear transformer that conversion efficiency is high also has 2W to 3W, so also far can not satisfy China and other national stand-by power consumption standard.
Switching Power Supply adapts to the input voltage of wide region because its switching frequency is high, and volume is little, conversion efficiency due to it reaches 80% to 90% in addition, its stand-by power consumption is less than 0.1W, and therefore, Switching Power Supply is by the research staff of industry and field of household appliances favor and generally employing.
But, because Switching Power Supply is based on power semiconductor (the being generally the MOSFET pipe) control method of switching time, make each road voltage stabilization of the transformer secondary output output of Switching Power Supply, each road voltage of transformer secondary output output is used as power supply by the circuit of back.Yet the shortcoming of Switching Power Supply is to exist comparatively serious switch to disturb.In Switching Power Supply, when the MOSFET pipe was operated in conducting state, the alternating voltage that it produces and electric current produce the spike interference by other components and parts in switching power circuit and resonance disturbs, and this can seriously affect the normal operation of complete machine.There is no in addition the isolation of Industrial Frequency Transformer due to the Switching Power Supply oscillator, spike disturbs and the resonance interference will seal in common frequency power network, and other electronic instrument, equipment and household electrical appliance near making are subject to severe jamming.
The utility model content
Main purpose of the present utility model is to propose a kind of switching power circuit, is intended to the high-frequency current signal in the filtering switching power circuit, suppresses to disturb.
in order to achieve the above object, the utility model proposes a kind of switching power circuit, this switching power circuit comprises the direct current input, transformer, the first rectification filtering module, the second rectification filtering module, the first voltage output end, second voltage output and switch control chip, described switch control chip comprises drain electrode end, source terminal and be used for the switch element conducting of control switch control chip inside or the control end of shutoff, described transformer comprises main winding, the first secondary winding and second subprime winding, one end of described main winding is connected with described direct current input, the other end is connected with the drain electrode end of described switch control chip, described the first secondary winding is connected with described the first rectification filtering module, described second subprime winding is connected with described the second rectification filtering module, described switching power circuit also comprises a magnetic bead, described magnetic bead is enclosed within on the source terminal of described switch control chip or is connected between described source terminal and ground.
Preferably, also comprise a Voltage Feedback module, described switch control chip also comprises a feedback end, and described Voltage Feedback module is connected between described feedback end and described the first voltage output end.
Preferably, described switch control chip is the TNY274-280 chip, and it comprises that a drain lead, one source pole pin, a bypass/multi-functional pin and enable/under-voltage pin; Wherein, described drain lead is the drain electrode end of described switch control chip, described source lead is the source terminal of described switch control chip, and described bypass/multi-functional pin is the control end of described switch control chip, and described enabling/under-voltage pin is the feedback end of described switch control chip.
Preferably, described switching power circuit also comprises the first electric capacity, and the bypass of described switch control chip/multi-functional pin is via described the first capacity earth.
Preferably, described the first electric capacity is electrochemical capacitor.
Preferably, described the first rectification filtering module comprises the first diode, the second electric capacity and the 3rd electric capacity, and described the second electric capacity is electrochemical capacitor; The anode of described the first diode is connected with the Same Name of Ends of described the first secondary winding, and the negative electrode of described the first diode is connected with described the first voltage output end; Described the second electric capacity and described the 3rd electric capacity are connected between described the first voltage output end and ground.
Preferably, described the second rectification filtering module comprises the second diode, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the first resistance and three terminal regulator; The anode of described the second diode is connected with the Same Name of Ends of described second subprime winding, the negative electrode of described the second diode is connected with the input of described three terminal regulator, and described the 4th electric capacity, described the 5th electric capacity and described the first resistance are connected between the negative electrode and ground of described the second diode; The earth terminal ground connection of described three terminal regulator, the output of described three terminal regulator is connected with described second voltage output, and described the 6th electric capacity and described the 7th electric capacity are connected between described second voltage output and ground.
Preferably, described the 4th electric capacity and described the 6th electric capacity are electrochemical capacitor.
Preferably, described Voltage Feedback module comprises the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 8th electric capacity, three end adjustable shunt reference source and photoelectrical couplers, and described photoelectrical coupler comprises light-emitting diode and phototriode; Described the first voltage output end is successively via described the second resistance, described the 3rd resistance and described the 4th grounding through resistance, the reference utmost point of described three end adjustable shunt reference sources and described the 3rd resistance be connected the connected node of the 4th resistance and be connected, the plus earth of described three end adjustable shunt reference sources, the negative electrode of described three end adjustable shunt reference sources is via the anodic bonding of described the 5th resistance and described light-emitting diode; The anode of described light-emitting diode is connected with described the first voltage output end via described the 6th resistance, the negative electrode of described light-emitting diode is connected with the negative electrode of described three end adjustable shunt reference sources, the collector electrode of described phototriode is connected with the feedback end of switch control chip, the grounded emitter of described phototriode, described the 8th electric capacity are connected between the negative electrode of the reference utmost point of described three end adjustable shunt reference sources and described three end adjustable shunt reference sources.
Preferably, described switching power circuit also comprises the 3rd diode, the 9th electric capacity and the 7th resistance; The anode of described the 3rd diode is connected with the Same Name of Ends of described main winding, and the negative electrode of described the 3rd diode is connected with the different name end of described main winding via described the 9th electric capacity, described the 7th resistance and described the 9th Capacitance parallel connection.
Compared to prior art; switching power circuit of the present utility model puts a magnetic bead or is connected a magnetic bead between this source terminal and ground in the source terminal of switch control chip; by the high-frequency current signal that produces after the main winding of magnetic bead filtering direct current by transformer; make the high-frequency current signal in switching power circuit be suppressed; reach the purpose that suppresses interference, realize the protection to switching power circuit.And then improve job stability and the reliability of Switching Power Supply, also guarantee to be connected to equipment work safety on electrical network and reliable.
Description of drawings
Fig. 1 is the circuit diagram of the utility model switching power circuit preferred embodiment.
The realization of the purpose of this utility model, functional characteristics and advantage in connection with embodiment, and is described further with reference to accompanying drawing.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
With reference to Fig. 1, Fig. 1 is the circuit diagram of the utility model switching power circuit preferred embodiment.
In the utility model preferred embodiment, switching power circuit comprises direct current input VI, transformer 10, the first rectification filtering module 20, the second rectification filtering module 30, the first voltage output end VO1, second voltage output VO2, Voltage Feedback module 40, switch control chip 50 and magnetic bead 60.
Wherein, switch control chip 50 comprises drain electrode end VD, source terminal VS, be used for the control end CTRL of the switch element conducting of control switch control chip 50 inside or shutoff and be used for adjusting PWM(Pulse Width Modulation, pulse width modulation according to the feedback signal of Voltage Feedback module 40) the feedback end FB of the duty ratio of control signal.Transformer 10 comprises main winding Ta, the first secondary winding Tb and second subprime winding Tc.The different name end of main winding Ta is connected with direct current input VI, and the Same Name of Ends of main winding Ta is connected with the drain electrode end VD of switch control chip 50.The first secondary winding Tb is connected with the first rectification filtering module 20, second subprime winding Tc is connected with the second rectification filtering module 30, be specially: the input of the first rectification filtering module 20 is connected with the Same Name of Ends of the first secondary winding Tb, the output of the first rectification filtering module 20 is connected with the first voltage output end VO1, the different name end ground connection of the first secondary winding Tb; The input of the second rectification filtering module 30 is connected with the Same Name of Ends of second subprime winding Tc, and the output of the second rectification filtering module 30 is connected with second voltage output VO2, the different name end ground connection of second subprime winding Tc.The input of Voltage Feedback module 40 is connected with the first voltage output end VO1, and the output of Voltage Feedback module 40 is connected with the feedback end FB of switch control chip 50.The source terminal VS that magnetic bead 60 is enclosed within switch control chip 50 goes up or is connected between this source terminal VS and ground.
In the present embodiment, the model of switch control chip 50 is TNY274-280, and it comprises that a drain lead D, one source pole pin S, a bypass/multi-functional pin BP/M and enable/under-voltage pin EN/UV.Wherein, drain lead D is equivalent to the drain electrode end VD of switch control chip 50.Source lead S is equivalent to the source terminal VS of switch control chip 50.Bypass/multi-functional pin BP/M is equivalent to the control end CTRL of switch element, and it is by one first capacitor C 1 ground connection, and the first capacitor C 1 is electrochemical capacitor, is used for storage of electrical energy.Enable/under-voltage pin EN/UV is equivalent to the feedback end FB of switch control chip 50.If switch control chip 50 is the paster encapsulation, the source lead S with switch control chip 50 is connected to ground by magnetic bead 60, when the connection of reality, only need the source lead S with an end connecting valve control chip 50 of wire jumper, the other end of wire jumper is passed magnetic bead 60 and receives ground; If switch control chip 50 is vertical encapsulation, just directly magnetic bead 60 is enclosed within on the source lead S of switch control chip 50.
The first rectification filtering module 20 comprises the first diode D1, the second capacitor C 2 and the 3rd capacitor C 3; The anode of the first diode D1 is connected with the Same Name of Ends of the first secondary winding Tb as the input of the first rectification filtering module 20, and the negative electrode of the first diode D1 is connected with the first voltage output end VO1; The second capacitor C 2 and the 3rd capacitor C 3 are connected between the first voltage output end VO1 and ground.
The first diode D1 is as rectifier diode, and the ac induction voltage that the Same Name of Ends of the first secondary winding Tb is exported carries out the rectification processing, and should change ac induction voltage is direct voltage; The second capacitor C 2 is electrochemical capacitor, and it both carried out filtering to the direct voltage of output as filtering and storage capacitor, stored again through filtered direct voltage; The 3rd capacitor C 3 is again carried out filtering to the direct voltage after the second capacitor C 2 and is processed as filter capacitor.
The second rectification filtering module 30 comprises the second diode D2, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the first resistance R 1 and three terminal regulator U1.
Wherein, the anode of the second diode D2 is as the input of the second rectification filtering module 30, be connected with the Same Name of Ends of second subprime winding Tc, the negative electrode of the second diode D2 is connected with the input Vin of three terminal regulator U1, and the 4th capacitor C 4, the 5th capacitor C 5 and the first resistance R 1 are connected between the negative electrode and ground of the second diode D2; The earth terminal GND ground connection of three terminal regulator U1, the output end vo ut of three terminal regulator U1 is connected with second voltage output VO2, and the 6th capacitor C 6 and the 7th capacitor C 7 are connected between second voltage output VO2 and ground.
The second diode D2 is as rectifier diode, and the ac induction voltage that the Same Name of Ends of second subprime winding Tc is exported carries out the rectification processing, and should change ac induction voltage is direct voltage; The 4th capacitor C 4 is electrochemical capacitor, and it both carried out filtering to the direct voltage of output as filtering and storage capacitor, stored again through filtered direct voltage; The 5th capacitor C 5 is again carried out filtering to the direct voltage after the 4th capacitor C 4 and is processed as filter capacitor; The 6th capacitor C 6 is electrochemical capacitor, and it is as filtering and storage capacitor, both filtering is carried out in the voltage of voltage regulation of the output end vo ut output of three terminal regulator U1, stores again through filtered voltage of voltage regulation; The 7th capacitor C 7 is again carried out filtering to the voltage of voltage regulation after the 6th capacitor C 6 and is processed all as filter capacitor.
Wherein, the first voltage output end VO1 is successively via the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 ground connection, the reference utmost point of three end adjustable shunt reference source D4 is connected with the connected node of the 3rd resistance R 3 and the 4th resistance R 4, the plus earth of three end adjustable shunt reference source D4, the negative electrode of three end adjustable shunt reference source D4 is via the anodic bonding of the 5th resistance R 5 with light-emitting diode D5; The anode of light-emitting diode D5 is connected with the first voltage output end VO1 via the 6th resistance R 6, the negative electrode of light-emitting diode D5 is connected with the negative electrode of three end adjustable shunt reference source D4, the collector electrode of phototriode Q1 is as the output of Voltage Feedback module 40, be connected the grounded emitter of phototriode Q1 with the control end CTRL of switch control chip 50.The 8th capacitor C 8 is connected between the negative electrode of the reference utmost point of three end adjustable shunt reference source D4 and three end adjustable shunt reference source D4.
In the present embodiment, switching power circuit also comprises the 3rd diode D3, the 9th capacitor C 9 and the 7th resistance R 7; The anode of the 3rd diode D3 is connected with the Same Name of Ends of the main winding Ta of transformer 10, and the negative electrode of the 3rd diode D3 is connected via the different name end of the 9th capacitor C 9 with the main winding Ta of transformer 10, and the 7th resistance R 7 is in parallel with the 9th capacitor C 9.In the present embodiment, the 3rd diode D3, the 9th capacitor C 9 and the 7th resistance R 7 form the leakage inductance absorption circuit of transformer 10.
The operation principle of the utility model switching power circuit specifically describes as follows:
as shown in Figure 1, the high-voltage constant current source of the main winding Ta from the direct current of direct current input VI input by transformer 10 and switch control chip 50 inside is given the first capacitor C 1 charging together, reach the starting of oscillation voltage of switch control chip 50 when the voltage at the first capacitor C 1 two ends, be that voltage in the bypass/multi-functional pin BP/M of switch control chip 50 is when rising to the starting of oscillation voltage of switch control chip 50, the switch element of switch control chip 50 inside, it is the metal-oxide-semiconductor conducting, the direct voltage of direct current input VI produces high-frequency current by the main winding Ta of transformer 10, this high-frequency current flows to ground by switch element and magnetic bead 60, contain abundant high order harmonic component in high-frequency current, odd harmonic in high order harmonic component particularly, because its contained energy is relatively large, be easy to circuit is produced to disturb even components and parts are caused damage.But 60 pairs of high-frequency current signals of magnetic bead have larger inhibition; can be the high-frequency current signal filtering; high-frequency current signal is suppressed; high-frequency current signal discharges with the form of heat energy by magnetic bead 60, thereby has protected this switching power circuit and other to be connected to safety and the reliability of the home appliance work on electrical network.
when the metal-oxide-semiconductor cut-off of the inside of switch control chip 50, the magnetic energy of storing in the main winding Ta of transformer 10 is converted into electrical energy transfer to the first secondary winding Tb and the second subprime winding Tc of transformer 10, and produce induced voltage at the first secondary winding Tb and the second subprime winding Tc of transformer 10, namely distinguish the induced voltage ac induction voltage of output AC respectively through the first rectification filtering module 20 at the Same Name of Ends of the first secondary winding Tb and the Same Name of Ends of second subprime winding Tc, the second rectification filtering module 30 rectifications, two kinds of output voltages of output after filtering and voltage stabilizing are processed.Simultaneously, the high-voltage constant current source of switch control chip 50 inside is given the first capacitor C 1 charging again.
voltage rising when the first voltage output end VO1 output, when namely the voltage of the first voltage output end VO1 output is greater than 12V, the voltage at the 4th resistance R 4 two ends raises, the internal resistance of the reference voltage stabilizing source of three end adjustable shunt reference source D4 inside reduces, in photoelectrical coupler U2, the luminous intensity of light-emitting diode D5 increases, voltage in photoelectrical coupler U2 between the collector and emitter of phototriode Q1 reduces, thereby the voltage that outputs on the enabling of switch control chip 50/under-voltage pin EN/UV reduces, make the duty ratio of the pwm control signal of switch control chip 50 outputs reduce, therefore the electric energy of transformer 10 outputs reduces, be that transformer 10 reduces from the electric energy that main winding Ta is delivered to the first secondary winding Tb and second subprime winding Tc, thereby make the lower voltage of the first voltage output end VO1 output.Otherwise, lower voltage when the first voltage output end VO1 output, the duty ratio of the pwm control signal of switch control chip 50 outputs increases, thereby make the voltage increases of the first voltage output end VO1 output, make the voltage of the stable output of the first voltage output end VO1 12V, the voltage of the stable output of second voltage output VO2 5V.
Compared to prior art; switching power circuit of the present utility model puts a magnetic bead 60 or is connected a magnetic bead 60 between this source terminal VS and ground at the source terminal VS of switch control chip 50; by the high-frequency current signal that produces after the main winding Ta of magnetic bead 60 filtering direct currents by transformer 10; make the high-frequency current signal in switching power circuit be suppressed; reach the purpose that suppresses interference, realize the protection to switching power circuit.And then improve job stability and the reliability of Switching Power Supply, also guarantee to be connected to equipment work safety on electrical network and reliable.
The above is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.
Claims (10)
1. switching power circuit, comprise the direct current input, transformer, the first rectification filtering module, the second rectification filtering module, the first voltage output end, second voltage output and switch control chip, described switch control chip comprises drain electrode end, source terminal and be used for the switch element conducting of control switch control chip inside or the control end of shutoff, described transformer comprises main winding, the first secondary winding and second subprime winding, one end of described main winding is connected with described direct current input, the other end is connected with the drain electrode end of described switch control chip, described the first secondary winding is connected with described the first rectification filtering module, described second subprime winding is connected with described the second rectification filtering module, it is characterized in that, described switching power circuit also comprises a magnetic bead, described magnetic bead is enclosed within on the source terminal of described switch control chip or is connected between described source terminal and ground.
2. switching power circuit as claimed in claim 1, is characterized in that, also comprises a Voltage Feedback module, and described switch control chip also comprises a feedback end, and described Voltage Feedback module is connected between described feedback end and described the first voltage output end.
3. switching power circuit as claimed in claim 2, is characterized in that, described switch control chip is the TNY274-280 chip, and it comprises that a drain lead, one source pole pin, a bypass/multi-functional pin and enable/under-voltage pin; Wherein, described drain lead is the drain electrode end of described switch control chip, described source lead is the source terminal of described switch control chip, and described bypass/multi-functional pin is the control end of described switch control chip, and described enabling/under-voltage pin is the feedback end of described switch control chip.
4. switching power circuit as claimed in claim 3, is characterized in that, described switching power circuit also comprises the first electric capacity, and the bypass of described switch control chip/multi-functional pin is via described the first capacity earth.
5. switching power circuit as claimed in claim 4, is characterized in that, described the first electric capacity is electrochemical capacitor.
6. switching power circuit as claimed in claim 1, is characterized in that, described the first rectification filtering module comprises the first diode, the second electric capacity and the 3rd electric capacity, and described the second electric capacity is electrochemical capacitor; The anode of described the first diode is connected with the Same Name of Ends of described the first secondary winding, and the negative electrode of described the first diode is connected with described the first voltage output end; Described the second electric capacity and described the 3rd electric capacity are connected between described the first voltage output end and ground.
7. switching power circuit as claimed in claim 6, is characterized in that, described the second rectification filtering module comprises the second diode, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the first resistance and three terminal regulator; The anode of described the second diode is connected with the Same Name of Ends of described second subprime winding, the negative electrode of described the second diode is connected with the input of described three terminal regulator, and described the 4th electric capacity, described the 5th electric capacity and described the first resistance are connected between the negative electrode and ground of described the second diode; The earth terminal ground connection of described three terminal regulator, the output of described three terminal regulator is connected with described second voltage output, and described the 6th electric capacity and described the 7th electric capacity are connected between described second voltage output and ground.
8. switching power circuit as claimed in claim 7, is characterized in that, described the 4th electric capacity and described the 6th electric capacity are electrochemical capacitor.
9. switching power circuit as claimed in claim 7, it is characterized in that, described Voltage Feedback module comprises the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 8th electric capacity, three end adjustable shunt reference source and photoelectrical couplers, and described photoelectrical coupler comprises light-emitting diode and phototriode; Described the first voltage output end is successively via described the second resistance, described the 3rd resistance and described the 4th grounding through resistance, the reference utmost point of described three end adjustable shunt reference sources and described the 3rd resistance be connected the connected node of the 4th resistance and be connected, the plus earth of described three end adjustable shunt reference sources, the negative electrode of described three end adjustable shunt reference sources is via the anodic bonding of described the 5th resistance and described light-emitting diode; The anode of described light-emitting diode is connected with described the first voltage output end via described the 6th resistance, the negative electrode of described light-emitting diode is connected with the negative electrode of described three end adjustable shunt reference sources, the collector electrode of described phototriode is connected with the feedback end of switch control chip, the grounded emitter of described phototriode, described the 8th electric capacity are connected between the negative electrode of the reference utmost point of described three end adjustable shunt reference sources and described three end adjustable shunt reference sources.
10. switching power circuit as claimed in claim 9, is characterized in that, described switching power circuit also comprises the 3rd diode, the 9th electric capacity and the 7th resistance; The anode of described the 3rd diode is connected with the Same Name of Ends of described main winding, and the negative electrode of described the 3rd diode is connected with the different name end of described main winding via described the 9th electric capacity, described the 7th resistance and described the 9th Capacitance parallel connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320285160.6U CN203278658U (en) | 2013-05-22 | 2013-05-22 | Switch power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320285160.6U CN203278658U (en) | 2013-05-22 | 2013-05-22 | Switch power supply circuit |
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| CN203278658U true CN203278658U (en) | 2013-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093245A (en) * | 2014-07-03 | 2014-10-08 | 广东良得光电科技有限公司 | Efficient isolation type LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093245A (en) * | 2014-07-03 | 2014-10-08 | 广东良得光电科技有限公司 | Efficient isolation type LED drive circuit |
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Granted publication date: 20131106 Termination date: 20140522 |