CN104753368A - Stereo switch power source - Google Patents
Stereo switch power source Download PDFInfo
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- CN104753368A CN104753368A CN201510159194.4A CN201510159194A CN104753368A CN 104753368 A CN104753368 A CN 104753368A CN 201510159194 A CN201510159194 A CN 201510159194A CN 104753368 A CN104753368 A CN 104753368A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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)
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- Dc-Dc Converters (AREA)
Abstract
The invention provides a stereo switch power source which comprises a primary rectifier and filter unit, a primary coil, a switch device, a PWM (pulse width modulation) unit, a sampling unit, a bias rectifier and filter unit, an auxiliary bias coil, a secondary coil and a secondary rectifier and filter unit, the auxiliary bias coil samples load power of the secondary coil, and the PWM unit stabilizes output voltage according to sampling result. A circuit is simple in structure and low in cost, and an open-loop circuit is designed in the stereo switch power source, so that the stereo switch power source is high in overload capacity, and large dynamic needs in the process of music playing can be met; a control unit is made on a thin film circuit board, and epoxy resin is adopted for encapsulating, so that number of devices is reduced, production efficiency is improved, reliability is enhanced, insulating performance of the circuit is improved, influence of external temperature and humidity is reduced, and the stereo switch power source has high environment adaptability.
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.Volume is little, lightweight, low in energy consumption, efficiency is high, ripple is little, noise is low, intelligence degree is high, can adapt to the good characteristics such as country variant voltage standard because it has for Switching Power Supply, 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, therefore need a kind of sound equipment 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, in primary side or be referred to as former avris, adopt assisted bias coil sampling voltage stabilizing, its primary side possesses the characteristic of Switching Power Supply, the mains fluctuations scope of 100 ~ 200V can be adapted to, its primary side or be referred to as secondary side, possesses the characteristic of Industrial Frequency Transformer, and overload capacity is strong, music dynamic range is large, bass is abundant, tonequality is pleasing to the ear.Based on this, the application provides a kind of Stereo Switch power supply, as shown in Figure 2, comprise primary rectifier filter unit, primary coil, switching device, PWM unit, sampling unit, biased rectifier filter unit, assisted bias coil, secondary coil and secondary commutation filter unit; Primary rectifier filter unit is connected with primary coil, for primary coil provides energy; 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 in the bearing power of primary side to secondary coil, after the rectifying and wave-filtering of biased rectifier filter unit, be sent to sampling unit; The sampled signal received is sent to PWM unit by sampling unit, and PWM unit outputs to the duty ratio of switching device control port signal according to sampled signal adjustment, with the ON time of control switch device and turn-off time, closely controls the electric energy of primary coil.
1, AC inputs voltage stabilizing
In practical work process, in peak times of power consumption, mains-supplied is not enough, there will be the situation of the supply voltage rising being input to the present embodiment Stereo Switch power supply, when supply voltage raises, the energy stored in primary coil raises, secondary coil and assisted bias coil-induced to energy increase, the voltage of now sampling unit sampling raises, and be sent to the sampling input pin of PWM unit, PWM unit reduces the duty ratio outputting to switching device control end signal, now the switch device conductive time reduces, the energy stored in primary coil reduces, the induced electromotive force that secondary coil utilizes electromagnetic induction principle to produce decreases, inhibit the trend that load voltage raises, thus serve when mains fluctuations, the object of the output voltage in steady load.
2, output voltage stabilizing
When output loading alleviates, namely when load resistance RL resistance increases, secondary coil output voltage increases, according to the mutual inductance principle of transformer, in assisted bias coil, voltage increases thereupon, the voltage of sampling unit sampling increases thereupon, and be sent to the sampling input pin of PWM unit, the PWM output pin of PWM unit is connected with the control pin of switching device control end, PWM unit reduces the duty ratio outputting to switching device control end signal, now the switch device conductive time reduces, the energy stored in primary coil reduces, the induced electromotive force that secondary coil utilizes electromagnetic induction principle to produce reduces thereupon, the trend that when inhibit load resistance to increase, load voltage raises.It is easily understood that work as load down, when RL resistance reduces, operation principle is identical, repeats no more herein.Utilize and change duty this reaches the object of voltage stabilizing.
3, overload (short circuit) protection
As shown in Figure 3, above-mentioned Stereo Switch power supply also comprises protected location, and protected location is connected with PWM unit and switching device; In the present embodiment, protected location is connected with the output pin of PWM unit overcurrent protection pin and switching device.Protected location is sampled to the electric current in primary coil by switching device, and sampled result is fed back to the overcurrent protection pin of PWM unit, and PWM unit outputs to the duty ratio of switching device control port signal according to sampled result adjustment.Concrete principle is as follows:
In inverse-excitation converting circuit, during switch device conductive, primary charging coil; Switching device close time, primary coil according to transformer mutual inductance principle to secondary coil and assisted bias coil discharge.When secondary coil charges, through the rectifying and wave-filtering of secondary commutation filter unit, output voltage and electric current.
When RL diminishes, namely when load becomes heavy, the energy that secondary coil needs increases, when the energy of primary coil is certain, according to conservation of energy principle, in assisted bias coil, energy reduces, the voltage of sampling unit sampling reduces thereupon, and sampling unit is input to the sampling input pin of PWM unit, through the inter-process of PWM unit by sampling output pin, PWM unit exports and switching device duty ratio ON time is increased, and the energy that assisted bias coil and secondary coil are obtained increases.
When RL resistance continues to diminish; namely when load continues to become heavy; secondary coil loop current continues to increase, and the energy of now assisted bias coil acquisition is less, and PWM unit output duty cycle ON time continues to increase; electric current in switching device is made to continue to increase; in switching device, electric current flows through the second sampling resistor, and the voltage U on the second sampling resistor increases, when U reaches overload protection threshold value; stopping exports by PWM unit, thus reaches the object of overcurrent protection.
When output short circuit; in secondary coil, electric current increases; output voltage reduces; the energy that assisted bias coil obtains is very little, and the voltage of sampling unit sampling reduces, and PWM unit output duty cycle ON time increases; in switching device, electric current increases; second sampling resistor power on voltage rise to short-circuit protection threshold value time, PWM unit stops exporting, thus reaches the object of short-circuit protection.
4, low-power consumption standby
When load is very light, RL resistance becomes large, namely time standby, in assisted bias coil, voltage increases, and the voltage of sampling unit sampling increases, when reaching the threshold value of standby mode in PWM unit, PWM unit exports and presents interval hop cycle state, the conducting number of times of switching device is greatly reduced, thus energy loss is greatly reduced, generally lower than 0.3W.
5, sound equipment Larger Dynamic is adapted to
As shown in Figure 4, 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, and be now equivalent to RL resistance and diminish, load becomes heavy.When load becomes heavy, the electric current in secondary coil loop increases, because secondary coil adopts copper wire winding, there is internal resistance, when the current increases, the voltage drop that secondary coil exports, assisted bias coil output voltage declines, the voltage of sampling unit sampling decreases, and be sent to the sampling input pin of PWM unit, the PWM output pin of PWM unit is connected with the control pin of switching device control end, this ON time of duty that PWM unit outputs to switching device control end signal increases, the energy stored in primary coil increases, rechargeable energy in secondary coil strengthens, adjust the different resistances of the second sampling resistor, this circuit can be made to have very strong overload capacity, to meet the Larger Dynamic demand in music process.
The beneficial effect of the application is:
The application provides a kind of Stereo Switch power supply, assisted bias coil is adopted to sample to bearing power in secondary coil, according to the ON time of the Duty ratio control switching device that sampled result adjustment PWM unit exports, carry out regulated output voltage, circuit power scope is 30W ~ 200W, circuit structure is simple, and circuit cost is low; Primary and secondary adopts open-loop design, and overload capacity is strong, can meet the demand signals of the Larger Dynamic of power amplifier, thus make audible bass powerful; PWM unit and sampling unit adopt thick-film technique to make on the same substrate, adopt and epoxy resin enclosedly define modular unit, decrease component number, improve production efficiency, enhance reliability, improve the insulation property of circuit, decrease the impact of external temperature, humidity, there is stronger environmental suitability.
Accompanying drawing explanation
Fig. 1 is Universal Switching Power Supply structural representation;
Fig. 2 is a kind of example structure schematic diagram of the application;
Fig. 3 is the another kind of example structure schematic diagram of the application;
Fig. 4 is the embodiment of the present application circuit theory diagrams;
Fig. 5 is the embodiment of the present application sampling unit electrical block diagram;
Fig. 6 is the embodiment of the present application encapsulation schematic 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.
The present embodiment provides a kind of Stereo Switch power supply, as shown in Figure 2, primary rectifier filter unit 1, primary coil 2, switching device 3, PWM unit 4, sampling unit 5, biased rectifier filter unit 6, assisted bias coil 7, secondary coil 8 and secondary commutation filter unit 9 is comprised.
In the present embodiment, PWM unit 4 comprises six pins, and wherein the first pin is ground pin; second pin is frequency setting pin, and three-prong is sampling input pin, and the 4th pin is chip power supply pin; 5th pin is overcurrent protection pin, and the 6th pin is PWM output pin.
In the present embodiment, sampling unit 5 comprises three pins, and wherein the first pin is power supply and sampling input pin, and the second pin is sampling output pin, and three-prong is ground pin.
Primary rectifier filter unit 1 pair of input signal carries 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 1 can adopt full-wave rectifier filter circuit to realize.Primary rectifier filter unit 1 is connected with primary coil 2, and the direct current after rectifying and wave-filtering is outputted to primary coil 2 by primary rectifier filter unit 1.
Assisted bias coil 7 utilizes electromagnetic induction principle to sample to the electric energy loaded of secondary coil 8 in primary side, after the rectifying and wave-filtering of biased rectifier filter unit 6, be sent to sampling unit 5; Biased rectifier filter unit 6 exports and is also connected with the chip power supply pin of PWM unit 4, powers to PWM unit 4; The electric energy of sampling unit 5 pairs of biased rectifier filter units 6 is sampled, and be sent to the sampling input pin of PWM unit 4, PWM unit 4 outputs to the duty ratio of switching device 3 control port signal according to sampled result adjustment, with the ON time of control switch device 3 and turn-off time, closely control the electric energy of primary coil 2.In the present embodiment, the electrical block diagram of sampling unit 5 as shown in Figure 5.Sampling unit 5 comprises operational amplifier OA and reference voltage source DC; The electric energy of biased rectifier filter unit 6 is inputted by the input port in of operational amplifier OA, reference voltage source is connected with an input port of operational amplifier, 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.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 biased rectifier filter unit 6 input voltage minor variations, highly sensitive.Output voltage feeds back to the sampling input pin of PWM unit 4, and PWM unit 4 is according to the duty ratio of the input signal adjustment PWM output signal of sampling input pin.
In the present embodiment, PWM unit 4 adopts the general PWM drive IC such as UC3842 or OB2263 to realize.
When switching device 3 is opened, primary coil 2 charges, and when switching device 3 is closed, primary coil 2 pairs of assisted bias coils 7 and secondary coil 8 charge, and the energy in primary coil 2 approximates the energy sum of assisted bias coil 7 and secondary coil 8.
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 designed this, the output voltage of assisted bias coil 7 is 16V, and secondary coil 8 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 2 raises, and the energy that secondary coil 8 and assisted bias coil 7 sense increases, namely the output voltage of assisted bias coil 7 is higher than 16V, and secondary coil 8 output voltage is higher than 18V, the voltage that now sampling unit 5 is sampled raises, and be sent to the sampling input pin of PWM unit 4, PWM unit 4 reduces the duty ratio outputting to switching device 3 control end signal, now switching device 3 ON time reduces, in primary coil 2, rechargeable energy reduces, the energy of secondary coil 8 and assisted bias coil 7 reduces, assisted bias coil 7 output voltage after the rectification of the first rectifier diode D1 decreases, secondary coil 8 output voltage is reduced to 18V, thus serve when mains fluctuations, stablize the object of secondary coil 8 output voltage 18V.
When supply voltage normal power supply, secondary coil 8 exports normally, as secondary coil 8 exports 18V/3A.If the load reduction of secondary coil 8, namely when RL resistance increases, secondary coil 8 output voltage raises, as risen to 18.1V from 18V, according to the mutual inductance principle of transformer, in assisted bias coil 7, voltage 16V increases, the voltage that sampling unit 5 is sampled increases, and be sent to the sampling input pin of PWM unit 4, the PWM output pin of PWM unit 4 is connected with the control pin of switching device 3 control end, PWM unit 4 sends duty ratio ON time and reduces instruction, now switching device 3 ON time reduces, in primary coil 2, rechargeable energy reduces, in secondary coil 8, energy reduces thereupon, output voltage is reduced to 18V, in assisted bias coil 7, voltage drop is low to moderate 16V, thus maintenance stable output.In like manner, when secondary coil 8 output voltage 18V reduces, assisted bias coil 7 output voltage 16V decreases, after sampling unit to PWM unit, PWM unit makes the ON time of switching device lengthen, make secondary coil 8 normally export 18V voltage, thus ensure that the stable of output voltage when load variations.
As shown in Figure 4, 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 8 loop increases, because secondary coil 8 stored energy is limited, the voltage 18V that secondary coil 8 exports declines, assisted bias coil 7 output voltage 16V declines, the voltage that sampling unit 5 is sampled decreases, and be sent to the sampling input pin of PWM unit 4, the PWM output pin of PWM unit 4 is connected with the control pin of switching device 3 control end, PWM unit 4 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 2 increases, secondary coil 8 rechargeable energy increases, secondary coil 8 exports and returns to 18V normal voltage.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, assisted bias coil 7 utilizes electromagnetic induction principle electric energy in primary side is to primary coil 2 and secondary coil 8 to sample, when there is fluctuation in electric energy in primary coil 2 or secondary coil 8, can according to sampled result regulated output voltage, circuit structure is simple, and circuit cost is low.
Above-mentioned biased rectifier filter unit 6 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 7, and the other end of assisted bias coil 7 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 5, and the other end of the first filter capacitor is connected to ground.The negative electrode of the first rectifier diode is connected with the power supply of sampling unit 5 and input pin of sampling.
First rectifier diode D carries out rectification to the electric energy of assisted bias coil 7.When a filter capacitor C1 is used for carrying out filtering to the electric energy of assisted bias coil 7.Sampling unit 5 is sampled to the first rectifier diode D1 negative electrode electric energy, and exports the sampling input pin of PWM unit 4 to.
Above-mentioned secondary commutation filter unit 9 comprises the second rectifier diode D2 and the second filter capacitor C2; 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 D2 is connected with one end of secondary coil 8, the negative electrode of the second rectifier diode D2 is connected with one end of the second filter capacitor C2, the other end of the second filter capacitor C2 is connected with the other end of secondary coil 8, and the other end of secondary coil 8 is connected to ground.
Assisted bias coil 7, primary coil 2 and secondary coil 8 are coupled by same magnetic core, assisted bias coil 7 utilizes electromagnetic induction principle to carry out electric energy sampling to primary coil 2 and secondary coil 8, primary coil 2 and assisted bias coil 7 form inverse-excitation type and convert, and primary coil 2 and secondary coil 8 form inverse-excitation type and convert.
As shown in Figure 4, if electromotive force direction is upper just lower negative in primary coil 2, then in secondary coil 8 and assisted bias coil 7 electromotive force direction be upper negative under just, now the first rectifier diode D1 and the second rectifier diode D2 anode voltage are less than cathode voltage, first rectifier diode D1 and the second rectifier diode D2 ends, and when switching device 3 is opened, primary coil 2 charges, when switching device 3 is closed, primary coil 2 pairs of assisted bias coils 7 and secondary coil 8 charge.
As shown in Figure 3, above-mentioned Stereo Switch power supply also comprises protected location 10, and protected location 10 is connected with PWM unit 4 and switching device 3; In the present embodiment, protected location 10 is connected with the output pin of PWM unit 4 overcurrent protection pin and switching device 3.Protected location 10 is sampled by the electric current in switching device 3 pairs of primary coils 2, and sampled result is fed back to the overcurrent protection pin of PWM unit 4, and PWM unit 4 outputs to the duty ratio of switching device 3 control port signal according to sampled result adjustment.As shown in Figure 4, above-mentioned protected location 10 comprises the first sampling resistor R1 and the second sampling resistor R2, and this first sampling resistor R1 and the second sampling resistor R2 connects, composition divider resistance.One end of first sampling resistor R1 is connected with the overcurrent protection pin of PWM unit 4; the other end of the first sampling resistor R1 is connected with one end of the second sampling resistor R2; one end of second sampling resistor R2 is connected with one end of switching device 3, and the other end of the second sampling resistor R2 is connected to ground.Electric current in switching device 3 forms sampling voltage on the second sampling resistor R2; voltage on second sampling resistor R2 is passed to the overcurrent protection pin of PWM unit 4 by the first sampling resistor R1 according to certain proportion; PWM unit 4 outputs to the duty ratio of the control signal of switching device 3 according to this Voltage Cortrol; closely control the electric energy stored in primary electrical depressor; by the setting of the resistance to the first sampling resistor R1 and the second sampling resistor R2; the protection point of circuit can be set; when load occurring the big current exceeding protection point, circuit is protected.Concrete principle is as follows:
When music signal is large, when power amplifier exports high-power, namely when load becomes heavy, namely secondary coil 8 is accelerated, when the energy of primary coil 2 is certain, according to conservation of energy principle, in assisted bias coil 7, energy reduces, assisted bias coil 7 output voltage is lower than 16V, the voltage that sampling unit 5 is sampled reduces thereupon, sampling unit 5 is input to the sampling input pin of PWM unit 4 by sampling output pin, through the inter-process of PWM unit 4, PWM unit 4 exports and switching device 3 duty ratio ON time is increased, the energy that assisted bias coil 7 and secondary coil 8 are obtained increases.
When power amplifier fault or loudspeaker burn out; secondary coil 8 loop current continues to increase; namely secondary coil 8 is accelerated load discharge; the energy that assisted bias coil 7 obtains is less; in assisted bias coil 7,16V voltage continues to decline; this ON time of duty that exports PWM unit 4 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 4, thus reaches the object of overcurrent protection.
When sound equipment power amplifier failed shorted; in secondary coil 8, electric current increases, and output voltage reduces, and the energy that assisted bias coil 7 obtains is very little; assisted bias coil 7 output voltage reduces very large; far below 16V, the voltage that sampling unit 5 is sampled reduces, and PWM unit 4 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 4 stops exporting, thus reaches the object of short-circuit protection.When short trouble is removed, power supply recovers normal work automatically.
When sound equipment stops playing, power amplifier power output is zero, in assisted bias coil 7, rechargeable energy increases, 16V voltage increases, and the voltage that sampling unit 5 is sampled increases, when reaching the threshold value of standby mode in PWM unit 4, PWM unit 4 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.
Said PWM unit 4 and sampling unit 5 make on the same substrate, adopt epoxy resin PWM unit 4, sampling unit 5 and substrate to be encapsulated, define modular unit.Above-mentioned modular unit, decreases component number, improves production efficiency, enhance reliability, improves the insulation property of circuit, and decrease the impact of external temperature, humidity, environmental suitability is strong.
Aforesaid substrate is glass mat, aluminium base or ceramic substrate.
PWM unit 4, sampling unit 5 and substrate are encapsulated by above-mentioned employing epoxy resin, form SMD or direct insertion individual devices.SMD or the direct insertion discrete component design of the many employings of Stereo Switch power supply in existing stereo set, is packaged into SMD or direct insertion individual devices by PWM unit 4 and sampling unit 5 in the present embodiment, has better circuit compatibility, easy to use.
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 (8)
1. a Stereo Switch power supply, comprises primary rectifier filter unit, primary coil, switching device, PWM unit, sampling unit, biased rectifier filter unit, assisted bias coil, secondary coil and secondary commutation filter unit:
Described primary rectifier filter unit is connected with described primary coil, for described primary coil provides energy;
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: the electric energy in described secondary coil exports after described secondary commutation filter unit rectifying and wave-filtering:
It is characterized in that:
Described assisted bias coil utilizes electromagnetic induction principle to sample in the bearing power of primary side to described secondary coil, after the rectifying and wave-filtering of biased rectifier filter unit, be sent to sampling unit:
The sampled signal received is sent to PWM unit by described sampling unit, described PWM unit outputs to the duty ratio of described switching device control port signal according to sampled signal adjustment, to control ON time and the turn-off time of described switching device, closely control the electric energy of described primary coil.
2. Stereo Switch power supply as claimed in claim 1, it is characterized in that, described PWM unit and described sampling unit adopt thick-film technique to make on the same substrate, adopt epoxy resin described PWM unit, described sampling unit and described substrate to be encapsulated, form independent entry device.
3. Stereo Switch power supply as claimed in claim 1, it is characterized in that, described biased rectifier filter unit comprises the first rectifier diode and the first filter capacitor:
The anode of described first rectifier diode is connected with one end of described assisted bias coil, the other end of described assisted bias coil is connected to ground: the negative electrode of described first rectifier diode is connected with one end of described first filter capacitor and one end of described sampling unit, and the other end of described first filter capacitor is connected to ground:
Described assisted bias coil is that described PWM unit is powered by described biased rectifier filter unit.
4. Stereo Switch power supply as claimed in claim 1, it is characterized in that, described secondary commutation filter unit comprises the second rectifier diode and the second filter capacitor:
The anode of described second rectifier diode is connected with one end of described secondary coil, the negative electrode of described second rectifier diode is connected with one end of described second filter capacitor, the other end of described second filter capacitor is connected with the other end of described secondary coil, and the other end of described secondary coil is connected to ground:
Described secondary coil by described secondary commutation filter unit for load provides electric energy.
5. 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.
6. Stereo Switch power supply as claimed in claim 1; it is characterized in that; described Stereo Switch power supply also comprises protected location; described protected location is connected with described PWM unit and described switching device: described protected location is sampled to the electric current in described primary coil by described switching device; and sampled result is fed back to PWM unit; described PWM unit outputs to the duty ratio of described switching device control port signal, to control the energy in primary coil according to sampled result adjustment.
7. Stereo Switch power supply as claimed in claim 2, it is characterized in that, described substrate is glass mat, aluminium base or ceramic substrate.
8. as the Stereo Switch power supply in claim 7 as described in any one, it is characterized in that, adopt epoxy resin described PWM unit, described sampling unit and described substrate to be encapsulated, form SMD or direct insertion individual devices.
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| CN201510159194.4A CN104753368A (en) | 2015-04-03 | 2015-04-03 | Stereo switch power source |
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| CN201510159194.4A CN104753368A (en) | 2015-04-03 | 2015-04-03 | Stereo switch power source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105162337A (en) * | 2015-09-10 | 2015-12-16 | 宁波知音音响设备有限公司 | High-power and high-stability loudspeaker box switching power supply |
| CN111918449A (en) * | 2020-07-10 | 2020-11-10 | 佛山市华全电气照明有限公司 | LED dimming control device with lamp turning-off function and control method thereof |
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| CN105162337A (en) * | 2015-09-10 | 2015-12-16 | 宁波知音音响设备有限公司 | High-power and high-stability loudspeaker box switching power supply |
| CN111918449A (en) * | 2020-07-10 | 2020-11-10 | 佛山市华全电气照明有限公司 | LED dimming control device with lamp turning-off function and control method thereof |
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