CN104779803A - Sound switching power supply - Google Patents
Sound switching power supply Download PDFInfo
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- CN104779803A CN104779803A CN201510158411.8A CN201510158411A CN104779803A CN 104779803 A CN104779803 A CN 104779803A CN 201510158411 A CN201510158411 A CN 201510158411A CN 104779803 A CN104779803 A CN 104779803A
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- power supply
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- coil
- switching device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a sound switching power supply. A PWM (pulse width modulation) control unit is encapsulated in a metal casing by using heat-conductive epoxy resin, the heat conduction effect is good, the insulation performance is high, the EMC (electro-magnetic compatibility) effect is good, the sound quality is improved, and the power supply is higher in environmental suitability, low in cost and convenient to produce and maintain; load power of a secondary coil is sampled by using an auxiliary bias coil, the PWM control unit outputs voltage stably according to a sampling result, and a circuit is simple in structure and low in cost; the sound switching power supply adopts open-loop circuit design, is high in overload capacity and can meet the large dynamic demand during music playing.
Description
Technical field
The application relates to field of audio, particularly relates to a kind of Stereo Switch power supply.
Background technology
Sound equipment power supply many employings Industrial Frequency Transformer in the market realizes, and the supply voltage of 220V is converted to 12V or other output voltage, has the advantages such as structure is simple, overload capacity is strong, signal dynamics is large; Along with rising steadily of copper processing, the cost advantage of traditional Industrial Frequency Transformer is more and more not obvious, and has the shortcomings such as conversion efficiency is low, stand-by power consumption is large, volume is large.Switching Power Supply has the good characteristics such as volume is little, lightweight, low in energy consumption, efficiency is high, ripple is little, noise is low, intelligence degree is high, easy dilatation because of it, is widely used on various electronic equipment.Switching Power Supply structure conventional in prior art as shown in Figure 1, in the structure shown here, the output electric energy of sampling feedback unit to primary side is sampled, and utilize photoelectric isolating device that sampled result is fed back to primary side, can effective regulated output voltage, according to P=UI, when power one timing, if voltage constant, electric current keeps constant substantially, large, the lower tone of distortion when signal Larger Dynamic.If the Larger Dynamic demand of stereo set in music process need be met, need to select more powerful Switching Power Supply, add hardware cost, cause the waste of circuit resource; Current Switching Power Supply many employings discrete component design, complex circuit, production maintenance difficult, failure rate is high, therefore needs a kind of integrated audio Switching Power Supply of low cost of the Larger Dynamic demand that can meet in music process.
Summary of the invention
The invention provides a kind of Stereo Switch power supply of primary side and primary side open-loop design, assisted bias coil sampling voltage stabilizing is adopted in primary side, its primary side possesses the characteristic of Switching Power Supply, and adapt to the mains fluctuations scope of 100 ~ 200V, its primary side possesses the characteristic of Industrial Frequency Transformer, and overload capacity is strong.
A kind of Stereo Switch power supply of the application; adopt the control module design of integration; wherein control module employing conductive coefficient is the thermal conductivity epoxy resin encapsulated of 1W/ (m DEG C); PWM unit, sampling unit, switching device and protected location are encapsulated in a metal shell and form independently components and parts; good heat dissipation effect; EMC is effective; decrease component number; improve the insulation property of circuit; decrease the impact of external temperature, humidity; have stronger environmental suitability, cost is low, produces easy to maintenance.
Based on this, the application provides a kind of Stereo Switch power supply, comprises primary rectifier filter unit, primary coil, assisted bias coil, biased rectifier filter unit, control module, secondary coil and secondary commutation filter unit; Primary rectifier filter unit is connected with primary coil, and primary rectifier filter unit outputs to primary coil to after the power supply signal rectifying and wave-filtering of input; Secondary coil is coupled by magnetic core with primary coil, and secondary coil utilizes electromagnetic induction principle that magnetic energy is converted to electric energy; Electric energy in secondary coil exports after secondary commutation filter unit rectifying and wave-filtering; Assisted bias coil utilizes electromagnetic induction principle to sample to the electric energy loaded of secondary coil in primary side, after the rectifying and wave-filtering of biased rectifier filter unit, is sent to control module; Control module controls the electric energy of primary coil output according to the sampled result of assisted bias coil.
Above-mentioned control module comprises PWM unit, sampling unit, switching device and protected location; PWM unit, sampling unit, switching device and protected location make on the same substrate, by be placed on same substrate PWM unit, sampling unit, switching device and protected location embedding be in same enclosure interior.Adopt silica gel or epoxy resin by be placed on same substrate PWM unit, sampling unit, switching device and protected location embedding be in same enclosure interior.This epoxy resin is heat-conducting type epoxy resin.The conductive coefficient of this epoxy resin is 1W/ (m DEG C).This housing is metal shell.By epoxy resin, switching device is connected with metal shell, the heat of switching device is delivered to metal shell.This metal shell has fixing feet, and fixing feet is used for being fixed metal shell and dispelling the heat.
The beneficial effect of the application is: the application provides a kind of Stereo Switch power supply, and adopt the control module design of integration, circuit is simple, and cost is low, produces easy to maintenance; Wherein control module employing conductive coefficient is the epoxy resin encapsulated of 1W/ (m DEG C), PWM unit, sampling unit, switching device and protected location are encapsulated and forms independently components and parts, decrease component number, improve the insulation property of circuit, decrease the impact of external temperature, humidity, good heat dissipation effect, there is stronger environmental suitability, cost is low, produces easy to maintenance; And a kind of Stereo Switch power acquisition of the application open loop circuit designs, overload capacity is strong, can meet the Larger Dynamic demand in music process.
Accompanying drawing explanation
Fig. 1 is general Stereo Switch power supply architecture schematic diagram;
Fig. 2 is a kind of Stereo Switch power supply of the application example structure schematic diagram;
Fig. 3 is the application's control module structural representation;
Fig. 4 is the application's control module encapsulation schematic diagram;
Fig. 5 is a kind of Stereo Switch power supply of the application embodiment circuit theory diagrams;
Fig. 6 is the embodiment of the present application sampling unit electrical block diagram.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
The term definition used in the application:
PWM:Pulse Width Modulation pulse width modulation.
Conductive coefficient: conductive coefficient refers under steady heat transfer condition, the material that 1m is thick, the temperature difference of both side surface is 1 degree, and within 1 second, the heat transmitted by 1 square area, unit is watt/ meter Du.
A kind of Stereo Switch power supply of the application, as shown in Figure 2, comprises primary rectifier filter unit 11, primary coil 12, assisted bias coil 13, biased rectifier filter unit 14, control module 10, secondary coil 15 and secondary commutation filter unit 16.
Primary rectifier filter unit 11 pairs of input signals carry out rectifying and wave-filtering, and alternating current is become direct current, as being the direct current of 310V by the AC rectification of 220V.In the present embodiment, primary rectifier filter unit 11 can adopt full-wave rectifier filter circuit to realize.Primary rectifier filter unit 11 is connected with primary coil 12, and the direct current after rectifying and wave-filtering is outputted to primary coil 12 by primary rectifier filter unit 11.Secondary coil 15 is coupled by magnetic core with primary coil 12, and secondary coil 15 utilizes electromagnetic induction principle that magnetic energy is converted to electric energy; Electric energy in secondary coil 15 exports after secondary commutation filter unit 16 rectifying and wave-filtering; Assisted bias coil 13 utilizes electromagnetic induction principle to sample to the electric energy loaded of secondary coil 15 in primary side, after the rectifying and wave-filtering of biased rectifier filter unit 14, is sent to control module 10; Control module 10 controls the electric energy of primary coil 12 output according to the sampled result of assisted bias coil 13.
In the present embodiment, primary coil 12 and secondary coil 15 form inverse-excitation type and convert; Primary coil 12 and assisted bias coil 13 form inverse-excitation type and convert.When control module 10 is opened, primary coil 12 charges; When control module 10 is ended, primary coil 12 pairs of assisted bias coils 13 and secondary coil 15 charge.
As shown in Figure 3, above-mentioned control module 10 comprises PWM unit 2, sampling unit 1, switching device 3 and protected location 4; The electric energy of sampling unit 1 to input is sampled, and exports PWM unit 2 to; PWM unit 2 outputs to the duty ratio of switching device 3 control port signal, with the turn-on and turn-off of control switch device 3 according to the signal adjustment that sampling unit 1 inputs; Protected location 4 is connected with control module 10; Protected location 4 is sampled by the electric current in control module 10 pairs of primary coils 12, and sampled result is fed back to control module 10, the electric energy that control module 10 exports according to sampled result adjustment primary coil 12.
Biased rectifier filter unit 14 comprises the first rectifier diode D1 and the first filter capacitor C1; First rectifier diode adopts withstand voltage 100V, and the Schottky diode of electric current 1A realizes; First filter capacitor adopts the 47uF of high frequency low-resistance, and the electrochemical capacitor of 50V realizes.The anode of the first rectifier diode is connected with one end of assisted bias coil 13, and the other end of assisted bias coil 13 is connected to ground; The negative electrode of the first rectifier diode is connected with one end of one end of the first filter capacitor and sampling unit 1, and the other end of the first filter capacitor is connected to ground; Assisted bias coil 13 is powered for PWM unit 2 by biased rectifier filter unit 14.
Secondary commutation filter unit 16 comprises the second rectifier diode and the second filter capacitor; Second rectifier diode D2 adopts withstand voltage 100V, and the Schottky diode of electric current 5A realizes; Second filter capacitor C2 adopts the electrochemical capacitor of 1000uF, 50V to realize.The anode of the second rectifier diode is connected with one end of secondary coil 15, the negative electrode of the second rectifier diode is connected with one end of the second filter capacitor, the other end of the second filter capacitor is connected with the other end of secondary coil 15, and the other end of secondary coil 15 is connected to ground; Secondary coil 15 by secondary commutation filter unit 16 for load provides electric energy.
Be that the Stereo Switch power supply of 50W is described for example with power output, when supply voltage is 220V, according to the transformer turn ratio designed, the output voltage of assisted bias coil 13 is 16V, and secondary coil 15 exports as 18V/3A.
In practical work process, when inputting 220V mains ripple, there will be the supply voltage being input to the present embodiment Stereo Switch power supply unstable, as being elevated to 240V from 220V, when supply voltage raises, the energy stored in primary coil 12 raises, and the energy that secondary coil 15 and assisted bias coil 13 sense increases, namely the output voltage of assisted bias coil 13 is higher than 16V, and secondary coil 15 output voltage is higher than 18V, the voltage that now sampling unit 1 is sampled raises, and be sent to the sampling input pin of PWM unit 2, PWM unit 2 reduces the duty ratio outputting to switching device 3 control end signal, now switching device 3 ON time reduces, in primary coil 12, rechargeable energy reduces, the energy of secondary coil 15 and assisted bias coil 13 reduces, assisted bias coil 13 output voltage after the rectification of the first rectifier diode D1 decreases, secondary coil 15 output voltage is reduced to 18V, thus serve when mains fluctuations, stablize the object of secondary coil 15 output voltage 18V.
When supply voltage normal power supply, secondary coil 15 exports normally, as secondary coil 15 exports 18V/3A.If the load reduction of secondary coil 15, namely when RL resistance increases, secondary coil 15 output voltage raises, as risen to 18.1V from 18V, according to the mutual inductance principle of transformer, in assisted bias coil 13, voltage 16V increases, the voltage that sampling unit 1 is sampled increases, and be sent to the sampling input pin of PWM unit 2, the PWM output pin of PWM unit 2 is connected with the control pin of switching device 3 control end, PWM unit 2 sends duty ratio ON time and reduces instruction, now switching device 3 ON time reduces, in primary coil 12, rechargeable energy reduces, in secondary coil 15, energy reduces thereupon, output voltage is reduced to 18V, in assisted bias coil 13, voltage drop is low to moderate 16V, thus maintenance stable output.In like manner, when secondary coil 15 output voltage 18V reduces, assisted bias coil 13 output voltage 16V decreases, after sampling unit to PWM unit, PWM unit makes the ON time of switching device lengthen, make secondary coil 15 normally export 18V voltage, thus ensure that the stable of output voltage when load variations.
As shown in Figure 5, load resistance RL is equivalent to the power amplification loop in acoustics circuit, can need big current when there is bass in audio signal, and now the power output of power amplifier is one times of standard output or more, now be equivalent to RL resistance diminish, load becomes heavy.When load becomes heavy, the electric current in secondary coil 15 loop increases, because secondary coil 15 stored energy is limited, the voltage 18V that secondary coil 15 exports declines, assisted bias coil 13 output voltage 16V declines, the voltage that sampling unit 1 is sampled decreases, and be sent to the sampling input pin of PWM unit 2, the PWM output pin of PWM unit 2 is connected with the control pin of switching device 3 control end, PWM unit 2 increases the duty ratio outputting to switching device 3 control end signal, now switching device 3 ON time increases, the energy stored in primary coil 12 increases, secondary coil 15 rechargeable energy increases, it is multiple to 18V normal voltage that secondary coil 15 exports Yan.The resistance of suitable adjustment second sampling resistor, can make this circuit have very strong overload capacity, to meet the Larger Dynamic demand in music process, is applied in sound equipment power supply, can be better than Industrial Frequency Transformer.Suitable adjustment transformer parameter value, can ensure that output voltage precision is about 5%, meet the supply voltage requirement of sound equipment power amplifier completely.
In the present embodiment, protected location 4 is connected with the output pin of PWM unit 2 overcurrent protection pin and switching device 3 protected location 4.Protected location 4 is sampled by the electric current in switching device 3 pairs of primary coils 12, and sampled result is fed back to the overcurrent protection pin of PWM unit 2, and PWM unit 2 outputs to the duty ratio of switching device 3 control port signal according to sampled result adjustment.Concrete principle is as follows:
When music signal is large, when power amplifier exports high-power, namely when load becomes heavy, namely secondary coil 15 is accelerated, when the energy of primary coil 12 is certain, according to conservation of energy principle, in assisted bias coil 13, energy reduces, assisted bias coil 13 output voltage is lower than 16V, the voltage that sampling unit 1 is sampled reduces thereupon, sampling unit 1 is input to the sampling input pin of PWM unit 2 by sampling output pin, through the inter-process of PWM unit 2, PWM unit 2 exports and switching device 3 duty ratio ON time is increased, the energy that assisted bias coil 13 and secondary coil 15 are obtained increases.
When power amplifier fault or loudspeaker burn out; secondary coil 15 loop current continues to increase; namely secondary coil 15 is accelerated load discharge; the energy that assisted bias coil 13 obtains is less; in assisted bias coil 13,16V voltage continues to decline; PWM unit 2 output duty cycle ON time continues to increase; electric current in switching device 3 is made to continue to increase; in switching device 3, electric current flows through the second sampling resistor; sampling voltage on second sampling resistor increases; when sampling voltage reaches overload protection threshold value, stopping exports by PWM unit 2, thus reaches the object of overcurrent protection.
When sound equipment power amplifier failed shorted; in secondary coil 15, electric current increases, and output voltage reduces, and the energy that assisted bias coil 13 obtains is very little; assisted bias coil 13 output voltage reduces very large; far below 16V, the voltage that sampling unit 1 is sampled reduces, and PWM unit 2 output duty cycle ON time increases; in switching device 3, electric current increases; second sampling resistor power on voltage rise to short-circuit protection threshold value time, PWM unit 2 stops exporting, thus reaches the object of short-circuit protection.When short trouble is removed, the automatic Yan of power supply normally works again.
When sound equipment stops playing, power amplifier power output is zero, in assisted bias coil 13, rechargeable energy increases, 16V voltage increases, and the voltage that sampling unit 1 is sampled increases, when reaching the threshold value of standby mode in PWM unit 2, PWM unit 2 exports and presents interval hop cycle state, the conducting number of times of switching device 3 is greatly reduced, thus energy loss is greatly reduced, generally lower than 0.3W.
PWM unit 2, sampling unit 1, switching device 3 make on the same substrate with protected location 4; by be placed on same substrate PWM unit 2, sampling unit 1, switching device 3 with protected location 4 embedding in same enclosure interior; form modular unit; decrease component number; improve the insulation property of circuit, decrease the impact of external temperature, humidity, there is stronger environmental suitability; cost is low, produces easy to maintenance.
In the present embodiment, PWM unit 2 adopts the general PWM drive IC such as UC3842 or OB2263 to realize.
In the present embodiment, the electrical block diagram of sampling unit 1 as shown in Figure 6.Sampling unit 1 comprises operational amplifier OA and reference voltage source DC; Reference voltage source is connected with an input port of operational amplifier, and the signal that another input port in inputs by operational amplifier and reference voltage source DC compare, and output port out exports sampled result to PWM unit 2.Reference voltage source DC can be connected with the inverting input of operational amplifier OA, input port in is connected with the in-phase input end of operational amplifier OA.For reference voltage source DC for 2.5V is described, according to the short characteristic of the void of operational amplifier, the input voltage of the in-phase input end of operational amplifier OA equals the voltage of reference voltage source DC, is 2.5V.When the voltage of input port in is greater than the voltage of reference voltage source DC, as during for 2.51V, the differential mode voltage Ud of operational amplifier OA in-phase input end and inverting input is 0.01V, operational amplifier OA output voltage Uo=AUd, because operational amplifier OA has the characteristic of high-gain, operational amplifier OA output voltage Uo increases, as, the output voltage of 2V can be obtained, thus reach the object detecting input voltage minor variations, highly sensitive.Sampling unit 1 output voltage feeds back to the sampling input pin of PWM unit 2, and PWM unit 2 is according to the duty ratio of the input signal adjustment PWM output signal of sampling input pin.
Sampling silica gel or epoxy resin by be placed on same substrate PWM unit 2, sampling unit 1, switching device 3 with protected location 4 embedding in same enclosure interior.Sampling silica gel or epoxy resin by the PWM unit 2 on same substrate, sampling unit 1, switching device 3 with protected location 4 embedding in same enclosure interior; fixation is served to the circuit on substrate and substrate; and there is good thermal conductivity due to silica gel or epoxy resin, adopt silica gel or epoxy resin the heat conduction produced in the components and parts course of work on substrate can be gone out.
In the present embodiment, preferably select heat-conducting type epoxy resin to realize, as select conductive coefficient be 1W/ (m DEG C) epoxy resin realize.Silica gel quality is softer; easily cause the damage of components and parts; epoxy resin hardness is high, good insulating; therefore preferentially select in the present embodiment heat-conducting type epoxy resin realize to the PWM unit 2 on same substrate, sampling unit 1, switching device 3 with and the embedding of protected location 4; being conducive to protecting components and parts not impaired while, the heat that effective conduction switching device 3 produces.
In the present embodiment, above-mentioned housing is metal shell.Metal shell is adopted to be conducive to the heat conduction of modular unit inside, on metal shell, dispelling the heat to modular unit; And switching device 3 can produce electromagnetic radiation when high frequency big current, adopt metal shell to carry out electromagnetic shielding, avoid electromagnetic radiation to have an impact to sound system tonequality.In the present embodiment, the metal shell be made of copper preferentially is selected.
By epoxy resin, switching device 3 is connected with metal shell, the heat of switching device 3 is delivered to metal shell.Epoxy resin is adopted to be connected with metal shell by switching device 3, for the heat of switching device 3 is delivered to metal shell.In a kind of Stereo Switch Power Operating Process of the application, switching device 3 is due to State Transferring frequently, for main heater members, heat-conducting type epoxy resin is adopted to be connected with metal shell by switching device 3, can the heat produced in switching device 3 course of work be delivered on metal shell, utilize metal shell to dispel the heat, avoid because heat causes circuit working efficiency to reduce at modular unit accumulated inside, even circuit damage.
Metal shell has fixing feet, and fixing feet is used for being fixed metal shell, dispelling the heat and earth shield.Fixing feet is connected with the zero potential ground wire of circuit board by higfh-tension ceramics electric capacity C, plays the effect of electromagnetic shielding.When control module in the present embodiment 10 being fixed on pcb board, the heat of metal shell, by the Copper Foil thermo-contact on scolding tin and pcb board, can be passed by Copper Foil by fixing feet, realizes the fixing of metal shell and heat radiation.Control module 10 described in the application isolate by higfh-tension ceramics electric capacity C and ground, circuit board hot junction, production, debug, easy to maintenance, degree of safety is high.
In sum, the application provides a kind of Stereo Switch power supply, and adopt the control module 10 of integration to design, circuit is simple, and cost is low, produces easy to maintenance; Wherein control module 10 adopts conductive coefficient to be the epoxy resin encapsulated of 1W/ (m DEG C), PWM unit 2, sampling unit 1, switching device 3 are encapsulated with protected location 4 and forms independently components and parts, decrease component number, improve the insulation property of circuit, decrease the impact of external temperature, humidity, good heat dissipation effect, there is stronger environmental suitability, cost is low, produces easy to maintenance; And a kind of Stereo Switch power acquisition of the application open loop circuit designs, overload capacity is strong, can meet the Larger Dynamic demand in music process.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made.
Claims (9)
1. a Stereo Switch power supply, is characterized in that:
Comprise primary rectifier filter unit, primary coil, assisted bias coil, biased rectifier filter unit, control module, secondary coil and secondary commutation filter unit;
Described primary rectifier filter unit is connected with described primary coil, and described primary rectifier filter unit outputs to described primary coil to after the power supply signal rectifying and wave-filtering of input;
Described secondary coil is coupled by magnetic core with described primary coil, and described secondary coil utilizes electromagnetic induction principle that magnetic energy is converted to electric energy; Electric energy in described secondary coil is power output after described secondary commutation filter unit rectifying and wave-filtering;
Described assisted bias coil utilizes electromagnetic induction principle to sample to the electric energy loaded of described secondary coil in primary side, after the rectifying and wave-filtering of described biased rectifier filter unit, is sent to control module;
Described control module controls the electric energy of described primary coil output according to the sampled result of described assisted bias coil.
2. Stereo Switch power supply as claimed in claim 1, it is characterized in that, described control module comprises PWM unit, sampling unit, switching device and protected location;
Described sampling unit is sampled to the electric energy that biased rectifier filter unit inputs, and exports PWM unit to;
Described PWM unit outputs to the duty ratio of described switching device control port signal, to control the turn-on and turn-off of described switching device according to the signal adjustment that described sampling unit inputs;
Described protected location is connected with described PWM unit; Described protected location is sampled to the electric current in described primary coil by described PWM unit, and sampled result is fed back to described PWM unit, and described PWM unit adjusts the turn-on and turn-off of described switching device according to sampled result;
Described PWM unit, described sampling unit, described switching device and described protected location make on the same substrate, will be placed in the described PWM unit on same substrate, described sampling unit, described switching device and described protected location embedding in same enclosure interior.
3. Stereo Switch power supply as claimed in claim 1, it is characterized in that, described primary coil and described secondary coil form inverse-excitation type and convert; Described primary coil and described assisted bias coil form inverse-excitation type and convert.
4. Stereo Switch power supply as claimed in claim 2, is characterized in that, sampling silica gel or epoxy resin will be placed in the described PWM unit on same substrate, described sampling unit, described switching device and described protected location embedding in same enclosure interior.
5. Stereo Switch power supply as claimed in claim 4, it is characterized in that, described epoxy resin is heat-conducting type epoxy resin.
6. Stereo Switch power supply as claimed in claim 5, it is characterized in that, the conductive coefficient of described epoxy resin is 1W/ (m DEG C).
7. Stereo Switch power supply as claimed in claim 4, it is characterized in that, described housing is metal shell.
8. Stereo Switch power supply as claimed in claim 7, be is characterized in that, be connected by described switching device by described epoxy resin with described metal shell, the heat of described switching device is delivered to described metal shell.
9. Stereo Switch power supply as claimed in claim 8, it is characterized in that, described metal shell has fixing feet, and described fixing feet is used for being fixed and earth shield described metal shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510158411.8A CN104779803A (en) | 2015-04-03 | 2015-04-03 | Sound switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510158411.8A CN104779803A (en) | 2015-04-03 | 2015-04-03 | Sound switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN104779803A true CN104779803A (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510158411.8A Pending CN104779803A (en) | 2015-04-03 | 2015-04-03 | Sound switching power supply |
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| CN (1) | CN104779803A (en) |
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| CN105207488A (en) * | 2015-10-26 | 2015-12-30 | 广州金升阳科技有限公司 | Loop control circuit of fly-back switching power supply and fly-back switching power supply adopting loop control circuit |
| CN105207489A (en) * | 2015-10-26 | 2015-12-30 | 广州金升阳科技有限公司 | Loop control method and circuit for fly-back switching power supply |
| CN105376688A (en) * | 2015-11-24 | 2016-03-02 | 深圳市航电技术研究院 | Power line audio conduction sensitivity testing mode switching device for airborne equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105207488A (en) * | 2015-10-26 | 2015-12-30 | 广州金升阳科技有限公司 | Loop control circuit of fly-back switching power supply and fly-back switching power supply adopting loop control circuit |
| CN105207489A (en) * | 2015-10-26 | 2015-12-30 | 广州金升阳科技有限公司 | Loop control method and circuit for fly-back switching power supply |
| CN105376688A (en) * | 2015-11-24 | 2016-03-02 | 深圳市航电技术研究院 | Power line audio conduction sensitivity testing mode switching device for airborne equipment |
| CN105376688B (en) * | 2015-11-24 | 2018-10-23 | 深圳市航电技术研究院 | Airborne equipment power cord audio conducted susceptibility test model switching device |
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