CN209030102U - A kind of High-power amplifier dual transformer switching power circuit - Google Patents

Abstract

The utility model relates to power technique fields; control circuit, rectification circuit, filter circuit, control power supply, driving transformer T7 and driving transformer T8 are put more particularly to a kind of powered-down source circuit of High-power amplifier dual transformer, including input terminal, transformer circuit, output end, transformer rectifier circuit, dual transformer switching power circuit protection circuit, high-power attack；The utility model directly carries out rectifying and wave-filtering to alternating current and is then input in transformer circuit; circuit and high-power attack is protected to put control circuit control transformer circuit using dual transformer switching power circuit; the voltage for making transformer T5 and T6 alternating outbound course opposite is input to output end finally by rectification circuit and filter circuit and uses for power amplifier; since the primary of transformer circuit uses concatenated primary coil; the parallel connection of secondary windings of transformer circuit allows the output of the power circuit to stablize.

Description

A kind of High-power amplifier dual transformer switching power circuit

Technical field

The utility model relates to power technique fields, and in particular to a kind of High-power amplifier dual transformer switch power supply Road.

Background technique

Power amplifier is a maximum family in all kinds of sound appliances, and effect mainly inputs source of sound equipment more micro- After weak signal amplifies, generates sufficiently large electric current and be pushed to the playback that loudspeaker carries out sound.It is high-power attack to put mainly answer Used in occasions such as discotheque, dance hall, stage performance, stadiums, the continuous output of long-time high power, high sound pressure is needed, therefore It is high-power to attack the stability and reliability put and continuous high power is needed to export.The general high-power capacitor filtering put and used of attacking rectifies Power supply must use high-power transformer material can guarantee higher performance, therefore power-supply system there are volumes big, quality weight, cost The problems such as high.Linear stabilized power supply has very high performance, but since voltage regulator circuit must use high-quality element, power supply production Cost is too high, while the power tube work in voltage regulator circuit, in amplification region, consumption power is larger, causes under power-supply system efficiency Drop.Switching Power Supply is the time ratio that control switch pipe turns on and off using modern power electronics technology, maintains to stablize output A kind of power supply of voltage.Most of switching power circuits compare the output voltage after sampling relatively with reference voltage, when certain When kind factor causes output voltage to change, comparison result will generate error signal, and the pulse width of switching circuit is then amplified Error signal control afterwards, such error amplifying circuit will affect the transient response of power supply, when it is high-power attack put rapid variation when Because of the lag of regulated and control network, electric power output voltage will appear moment drop, cause power output unstable.

Summary of the invention

To solve problems of the prior art, the utility model provides a kind of High-power amplifier dual transformer switch electricity Source circuit improves power work efficiency, reduces production cost, reduces volume, improves output stability.

A kind of High-power amplifier dual transformer Switching Power Supply that achieve the above purpose, the technical solution of the present invention is: Circuit, including input terminal, transformer circuit and output end further include transformer rectifier circuit, dual transformer switching power circuit guarantor Protection circuit, high-power attack put control circuit, rectification circuit, filter circuit, control power supply, driving transformer T7 and driving transformer T8；The transformer rectifier circuit connects input terminal；The transformer circuit includes bridge switching circuit, transformer T5, transformer The primary coil T50 of T6, transformer T5 are equipped with terminals 1C and terminals 2C, and the primary coil T60 of transformer T6 is equipped with wiring 1D and terminals 2D, terminals 2C is held to connect with terminals 1D, terminals 1C passes through bridge switching circuit and transformer rectifier circuit Connection, terminals 2D are connect by bridge switching circuit with ground terminal AGND, and primary coil T50 connects with primary coil T60；Become The secondary coil of depressor T5 is made of secondary coil T51, secondary coil T52, secondary coil T53 and secondary coil T54, transformer The secondary coil of T6 is made of secondary coil T61, secondary coil T62, secondary coil T63 and secondary coil T64, transformer T5's Rectification circuit is connected after the parallel connection of secondary windings of secondary coil and T6, the output end of rectification circuit connects filter circuit, filtered electrical The output end on road connects output end；Bridge switching circuit connects driving transformer T7 and driving transformer T8, driving transformer T7 It puts control circuit with driving transformer T8 with high-power attack and connect, dual transformer switching power circuit protects circuit connection high-power It attacks and puts control circuit, dual transformer switching power circuit protection circuit, driving transformer T7 connect control with driving transformer T8 Power supply.

Input terminal accesses power grid AC power source, and power grid AC power source is directly rectified into direct current by transformer rectifier circuit.Become The primary coil of transformer T5 and T6 in transformer circuits form series circuit, are alternately inputted by bridge switching circuit, to change The opposite electric current of the primary coil input direction of depressor T5 and T6, output electric current instant response speed is high, voltage output characteristics It is good.The secondary coil formation of transformer T5 and T6 are connected in parallel, and secondary current superposition exports powerful need to meet It wants；By rectification circuit and filter circuit, provide output end reliable and stable DC power supply.It is attacked by control power supply to high-power It puts control circuit, control power supply and protects circuit and high-power attack to put control circuit power supply to dual transformer switching power circuit, lead to Cross dual transformer switching power circuit and give High-power amplifier control circuit control signal, according to the signal by driving transformer T7 and Driving transformer T8 is worked alternatively, and to change the working condition of transformer circuit, realizes the transformation output of direct current.

Further, the terminals 1C is connect with one end of RC mould group, and terminals 2D is connect with the other end of RC mould group, The transformation RC mould group is composed in series by resistance R37 and capacitor C21.Capacitor prevents voltage jump, absorbs the excessively electric of kurtosis Pressure, concatenated resistance play damping action, the energy of resistance consumption overvoltage, thus the oscillation of suppression circuit.

Further, the primary coil of the driving transformer T7 is made of primary coil T71 and primary coil T72, just Grade coil T71 and primary coil T72 is equipped with common terminal 2A, and primary coil T71 is additionally provided with terminals 1A, primary coil T72 It is additionally provided with terminals 3A, the secondary coil of driving transformer T7 is by the secondary coil T73 and secondary coil T74 group that are connected in parallel At secondary coil T73 is equipped with terminals 7A and terminals 6A, and secondary coil T74 is equipped with terminals 5A and terminals 4A, terminals 7A, terminals 6A, terminals 5A and terminals 4A are arranged successively；The primary coil of the driving transformer T8 is by primary coil T81 and primary coil T82 composition, primary coil T81 and primary coil T82 are equipped with common terminal 2B, and primary coil T81 is separately set There are terminals 1B, primary coil T82 to be additionally provided with terminals 3B, terminals 1A is connect with terminals 1B, terminals 2B and terminals Connection control power supply, terminals 3A are connect with terminals 3B after 2A connection, and the secondary coil of driving transformer T8 is by being connected in parallel Secondary coil T83 and secondary coil T84 composition, secondary coil T83 be equipped with terminals 7B and terminals 6B, secondary coil T84 Equipped with terminals 5B and terminals 4B, terminals 7B, terminals 6B, terminals 5B and terminals 4B are arranged successively.Terminals 2B Connection control power supply after connecting with terminals 2A, if primary coil T71 and primary coil T81 work, generation current direction is identical, If primary coil T72 and primary coil T82 work, when generating current direction and primary coil T71 and primary coil T81 work The current direction of generation is opposite.By the above-mentioned two groups of primary coils of on-off, to make secondary coil T73, secondary coil T74, secondary coil T83, secondary coil T84 generate two kinds of contrary electric currents, realize the control to transformer circuit.

Further, the bridge switching circuit includes four groups of switch protecting circuits, and the switch protecting circuit includes protecting Protection circuit and switching circuit, protection circuit include the end voltage source E1, the end voltage source E2, triode V9, diode D11, load electricity Hinder R30, collector load resistor R14, base resistance R26 and voltage source resistance R8；The base stage of triode V9 connects base resistance The other end of R26, base resistance R26 connect the end E1 of voltage source, the emitter connection of triode V9 with the cathode of diode D11 The collector of the anode of diode D11, triode V9 connects collector load resistor R14, and collector load resistor R14's is another End connects voltage source resistance R8 with load resistance R30, and the end voltage source resistance R8 connection voltage source E2, load resistance R30's is another End is connect with the emitter of the anode of diode D11 and triode V9；Switching circuit includes output end E3, output end E4, metal-oxide-semiconductor Q3 and switch RC mould group, the source electrode connection of described drain electrode mould group one end connection switch RC metal-oxide-semiconductor Q3 and output end E3, metal-oxide-semiconductor Q3 The other end and output end E4 of switch RC mould group, the source electrode of metal-oxide-semiconductor Q3 are connect with the anode of diode D11, the grid of metal-oxide-semiconductor Q3 By the end voltage source resistance R8 connection voltage source E2, the mould group both ends switch RC connect output end E3 and output end E4, switch RC mould Group is composed in series by the resistance R34 and capacitor C18 being connected in series.If the end voltage source E2 is high level, then the end voltage source E1 is low Level, in this state, the grid of metal-oxide-semiconductor Q3 obtain cut-in voltage, so that the drain electrode of the source electrode of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q3 is led Logical, the base stage of triode V9 is low level, and triode V9 is not turned on；If the end voltage source E2 is low level, then the end voltage source E1 is High level, in this state, the grid of metal-oxide-semiconductor Q3 is low level, so that the drain electrode of the source electrode of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q3 is not led Logical, the base stage of triode V9 is high level, and the grid of metal-oxide-semiconductor Q3 is connected to the source electrode of metal-oxide-semiconductor Q3, releases by triode V9 conducting The residual voltage because disconnecting generation after metal-oxide-semiconductor Q3 conduction is bled off, plays the role of protecting metal-oxide-semiconductor Q3；Meanwhile switch RC mould group is This inverse peak voltage provides Releasing loop, prevents metal-oxide-semiconductor Q3 reverse breakdown.

Further, the end voltage source E1 of first group of switch protecting circuit is connect with the terminals 6A of driving transformer T7, The end voltage source E2 of first group of switch protecting circuit is connect with the terminals 7A of driving transformer T7, first group of switch protecting circuit The end voltage source E3 connect with transformer rectifier circuit, the end voltage source E4 of first group of switch protecting circuit and driving transformer T5's Terminals 1C connection, the end voltage source E2 of second group of switch protecting circuit are connect with the terminals 5B of driving transformer T8, and second The end voltage source E1 of group switch protecting circuit is connect with the terminals 4B of driving transformer T8, the electricity of second group of switch protecting circuit The end potential source E3 is connect with the terminals 2D of transformer T6, and the end voltage source E4 of second group of switch protecting circuit and ground terminal AGND connect It connects；The end voltage source E1 of third group switch protecting circuit is connect with the terminals 7B of driving transformer T8, third group switch protection The end voltage source E2 of circuit is connect with the terminals 6B of driving transformer T7, the end voltage source E3 of third group switch protecting circuit with Transformer rectifier circuit connection, the end voltage source E4 of third group switch protecting circuit are connect with the terminals 2D of driving transformer T6, The end voltage source E2 of 4th group of switch protecting circuit is connect with the terminals 4A of driving transformer T7, the 4th group of switch protecting circuit The end voltage source E1 connect with the terminals 5A of driving transformer T7, the end voltage source E3 of the 4th group of switch protecting circuit and transformation The terminals 1C connection of device T5, the end voltage source E4 of the 4th group of switch protecting circuit is connect with ground terminal AGND.If primary coil The end voltage source E2 of T71 and primary coil T81 work, first group of switch protecting circuit and second group of switch protecting circuit is high electricity Flat, the end voltage source E1 of first group of switch protecting circuit and second group of switch protecting circuit is low level, third group switch protection The end voltage source E2 of circuit and the 4th group of switch protecting circuit is low level, and third group switch protecting circuit and the 4th group of switch are protected The end voltage source E1 of protection circuit is high level, the metal-oxide-semiconductor Q3 grid of first group of switch protecting circuit and second group of switch protecting circuit Pole obtains cut-in voltage, the metal-oxide-semiconductor Q3 conducting of first group of switch protecting circuit and second group of switch protecting circuit, and electric current successively passes through Over commutation transforming circuit, the metal-oxide-semiconductor Q3 of first group of switch protecting circuit, primary coil T50, primary coil T60 and second group are opened Forming circuit is connect with ground terminal AGND after closing the metal-oxide-semiconductor Q3 of protection circuit, primary coil T50 and primary coil T60 are obtained just To voltage；If primary coil T72 and primary coil T82 work, first group of switch protecting circuit and second group of switch protecting circuit The end voltage source E2 be low level, the end voltage source E1 of first group of switch protecting circuit and second group of switch protecting circuit is high electricity Flat, the end voltage source E2 of third group switch protecting circuit and the 4th group of switch protecting circuit is high level, third group switch protection The end voltage source E1 of circuit and the 4th group of switch protecting circuit is low level, and third group switch protecting circuit and the 4th group of switch are protected The metal-oxide-semiconductor Q3 grid of protection circuit obtains cut-in voltage, the metal-oxide-semiconductor of third group switch protecting circuit and the 4th group of switch protecting circuit Q3 conducting, electric current successively pass through transformer rectifier circuit, the metal-oxide-semiconductor Q3 of third group switch protecting circuit, primary coil T60, primary It connect forming circuit after coil T50 and the 4th group of switch protecting circuit metal-oxide-semiconductor Q3 with ground terminal AGND, primary coil T50 and just Grade coil T60 obtains backward voltage；Such first group of switch protecting circuit and second group of switch protecting circuit work, third group are opened Pass protects circuit and the 4th group of switch protecting circuit not to work, and alternately and repeatedly works, and the direct current after rectification is passed through transformer T5 It is output in rectification circuit with T6.

Further, it is described it is high-power attack put control circuit include first group of high-power attack put control protection electric circuit and second High-power attack of group puts control protection electric circuit, and described first group high-power to attack that put control protection electric circuit include the first signal source input terminal The collector of S1, resistance R18, diode D7, base resistance R23 and triode V8, triode V8 are connect with load end F1, three poles The emitter of pipe V8 is connect with ground terminal DGND, and the base stage of triode V8 is connect with base resistance R23, base resistance R23 and two The cathode of pole pipe D7 connects, and the anode of diode D7 connects the first signal source input terminal S1, the first signal source input terminal S1 and connects Resistance R18 is connected between ground terminal DGND；Described second group high-power to attack that put control protection electric circuit include second signal source input terminal S2, resistance R19, diode D6, base resistance R22, triode V7 and load end F2, the collector and load end F2 of triode V7 Connection, the emitter of triode V7 are connect with ground terminal DGND, and the base stage of triode V7 is connect with base resistance R22, base stage electricity Resistance R22 is connect with the cathode of diode D6, the anode connection second signal source input terminal S2 of diode D6, the input of second signal source It holds and connects resistance R19 between S2 and ground connection DGND.Base resistance R23 makes triode V8 emitter be in forward bias, and provides Size base current appropriate, resistance R18 have the function of shunting, electric current reverse flow when diode D6 prevents triode V8 from failing It is dynamic, damage signal element；Similarly second group it is high-power attack put control protection electric circuit and first group it is high-power attack put control protection electricity The corresponding electronic component in road has phase same-action；If the first signal source input terminal S1 has input current signal, the base of triode V8 Pole obtains enough electric currents and saturation conduction, the i.e. collector and emitter of triode V8 are connected, the load work for connecting load end Make；Same second group high-power attack put control protection electric circuit working principle it is identical；As the first signal source input terminal S1 and second Signal source input terminal S2 interval works alternatively, and load can discontinuous operation.

Further, the collector of the triode V8 connects the both ends of the first RC mould group with the emitter of triode V8, The first RC mould group is composed in series by resistance R24 and capacitor C19；The transmitting of the collector and triode V7 of the triode V7 Pole connects the both ends of the 2nd RC mould group, and the 2nd RC mould group is composed in series by resistance R25 and capacitor C20；The diode D7 Anode connect with the base stage of switching tube Q8, the cathode of diode D7 is connect with the emitter of switching tube Q8, the collection of switching tube Q8 Electrode connects ground terminal DGND；The diode D6 anode connect with the base stage of switching tube Q9, the cathode of diode D6 with open The emitter connection of pipe Q9 is closed, the collector of switching tube Q9 connects ground terminal DGND.The work of first RC mould group and the 2nd RC mould group With identical, capacitor prevents voltage jump, absorbs the overvoltage of kurtosis, and concatenated resistance plays damping action, resistance consumption mistake The energy of voltage, thus the oscillation of suppression circuit；Switching tube Q8 effect is the remnants electricity after releasing triode V8 power-off, switching tube Q9 effect is the remnants electricity after releasing triode V7 power-off.

Further, the terminals 1B of the terminals 1A and transformer T8 of the transformer T7 connect load end F1, described The terminals 3B of the terminals 3A and transformer T8 of transformer T7 connect load end F2；When the first signal source input terminal S1 has input Current signal, the collector and emitter conducting of triode V8, primary coil T71 and primary coil T81 work, secondary coil T73, secondary coil T74, secondary coil T83, secondary coil T83 generate forward current, control transformer circuit work；When second Signal source input terminal S2 has input current signal, the collector and emitter conducting of triode V7, primary coil T72 and primary line T82 work is enclosed, secondary coil T73, secondary coil T74, secondary coil T83, secondary coil T83 generate reverse current, and control becomes Transformer circuits work.

Further, dual transformer switching power circuit protection circuit includes pwm chip, triode V3, triode V4, protection RC mould group, resistance R20 and polar capacitor C34, pwm chip include terminals CSS, power end VC, power end VCC, output end OUT A, output end OUT B and input terminal INV IN, input terminal INV IN are connect with ground terminal DGND, output end OUT A the first signal source of connection input terminal S1, output end OUT B connection second signal source input terminal S2, power end VC and power supply VCC connection is held to control power supply, terminals CSS is connect with polar capacitor C34 anode, and polar capacitor C34 cathode connects ground terminal The collector of DGND, triode V4 are connected with polar capacitor C34 anode, the emitter and polar capacitor C34 cathode of triode V4 Connection, the base stage of triode V4 are connected with triode V3 emitter, and the collector of triode V3 and the collector of V4 connect, three poles The base stage of pipe V3 is connect with resistance R20, and the other end connection protection signal source of resistance R20, one end of protection RC mould group is connected to Between resistance R20 and the base stage of triode V3, the other end of protection RC mould group connects ground terminal DGND, protects RC mould group by capacitor C14 and resistance R43 are composed in parallel；The interference signal that the effect of protection RC mould group inhibits power source internal to generate enters circuit；Protection Signal source passes through resistance R20, and resistance R20 is biasing resistor, provides size base current appropriate, base current is through overprotection RC The filtering of mould group, promotes triode V3 and triode V4 to be connected, and the both ends polar capacitor C34 are connected, and forms repid discharge, polar capacitor After C34 electric discharge, pwm chip stops working, and protects dual transformer Switching Power Supply；Pass through output end OUT A and output end OUT B is put control circuit on-off and is controlled to high-power attack, and output end is made to obtain a series of equal pulse of amplitudes.

Further, the protection signal source includes the temperature protection signal being connected in parallel, attacks and put protection signal and power supply Other protection signals, temperature protection signal are connect after diode D8 with resistance R20, are attacked and are put protection signal by diode D9 It is connect afterwards with resistance R20, other protection signals of power supply are connect after diode D10 with resistance R20；It is unidirectionally led by diode Logical function prevents electric current adverse current, and protection obtains the element of protection signal.

Compared with prior art, the utility model has the beneficial effects that the utility model first directly carries out alternating current Rectifying and wave-filtering is then input in transformer circuit, protects circuit and high-power attack to put control using dual transformer switching power circuit Circuit control transformer circuit processed, the voltage for making transformer T5 and T6 alternating outbound course opposite is finally by rectification circuit and filter Wave circuit is input to output end and uses for power amplifier, since the primary of transformer circuit uses concatenated primary coil, transformer Therefore the parallel connection of secondary windings of circuit allows the output of the power circuit to stablize.The bridge switching circuit of the utility model has certainly The protective effect of body, high-power attack put the protective effect that control circuit has itself.Compared with the existing technology, dual transformer switchs The structure of power circuit protection circuit is able to achieve quick protection, improves the safety of circuit.

Detailed description of the invention

Fig. 1 is High-power amplifier dual transformer switching power circuit working principle diagram.

Fig. 2 is transformer circuit working principle diagram.

Fig. 3 is bridge switching circuit working principle diagram.

Fig. 4 is switch protecting circuit working principle diagram.

Fig. 5 connects high-power attack with driving transformer T8 for driving transformer T7 and puts control circuit working principle diagram.

Fig. 6 is that first group of high-power attack puts control protection electric circuit working principle diagram.

Fig. 7 is that dual transformer switching power circuit protects circuit.

Specific embodiment

The utility model is described in further details with reference to the accompanying drawings and detailed description.

As shown in figs. 1-7, a kind of High-power amplifier dual transformer switching power circuit, including input terminal 1, rectifier transformer electricity It is road 2, transformer circuit 3, rectification circuit 4, filter circuit 5, output end 6, dual transformer switching power circuit protection circuit 7, big Power, which is attacked, puts control circuit 8, control power supply 9, driving transformer T7 and driving transformer T8.

Control power supply 9 is 13V direct current, and the input terminal of the transformer rectifier circuit 2 connects input terminal 1.

The transformer circuit 3 includes bridge switching circuit 10, transformer T5 and transformer T6.

The primary coil T50 of transformer T5 is equipped with terminals 1C and terminals 2C, and the primary coil T60 of transformer T6 is equipped with Terminals 1D and terminals 2D, terminals 2C are connected with terminals 1D, and terminals 1C is connect with bridge switching circuit 10, terminals 2D is connect with bridge switching circuit 10, and the secondary coil of transformer T5 is by secondary coil T51, secondary coil T52, secondary coil T53 and secondary coil T54 composition, transformer T6 secondary coil by secondary coil T61, secondary coil T62, secondary coil T63 and Secondary coil T64 composition, the secondary coil of transformer T5 and the parallel connection of secondary windings of transformer T6, the secondary coil of transformer T5 It is connected to rectification circuit 4 with the secondary coil output end of transformer T6, the output end of rectification circuit 4 connects filter circuit 5, filtering The output end of circuit 5 connects output end 6.

Bridge switching circuit 10 connects driving transformer T7 and driving transformer T8, driving transformer T7 and driving transformer T8 is put control circuit 8 and is connect with high-power attack, and dual transformer switching power circuit protection circuit 7 connects high-power attack and puts control electricity Road 8, dual transformer switching power circuit protection circuit 7, driving transformer T7 connect control power supply 9 with driving transformer T8.It is whole Capacitor C99 is connected between current circuit 4 and filter circuit 5, the other end of capacitor C99 connects ground terminal AGND, and input terminal 1 accesses Power grid AC power source is directly rectified into directly by power grid AC power source, in the present embodiment, voltage 220V, transformer rectifier circuit 2 Galvanic electricity, in the present embodiment, the primary coil of DC voltage 320V, driving transformer T7 and driving transformer T8 form series connection Circuit is alternately inputted by bridge switching circuit 10, to the primary coil input side of driving transformer T7 and driving transformer T8 To opposite electric current, electric current instant response speed height is exported, voltage output characteristics are good.Driving transformer T7 and driving transformer The secondary coil formation of T8 is connected in parallel, and secondary current superposition exports powerful needs to meet；Pass through rectification circuit 4 and filter circuit 5, provide output end reliable and stable DC power supply.

Terminals 1C is connect with one end of RC mould group, and terminals 2D is connect with the other end of RC mould group, the RC mould group by Concatenated resistance R37 and capacitor C21 composition.Capacitor C21 prevents voltage jump, absorbs the overvoltage of kurtosis, concatenated electricity It hinders R37 and plays damping action, the energy of resistance consumption overvoltage, thus the oscillation of suppression circuit.

The primary coil of driving transformer T7 is made of primary coil T71 and primary coil T72, primary coil T71 and just Grade coil T72 is equipped with common terminal 2A, and primary coil T71 is additionally provided with terminals 1A, and primary coil T72 is additionally provided with terminals The secondary coil of 3A, driving transformer T7 are made of the secondary coil T73 and secondary coil T74 being connected in parallel, secondary coil T73 Equipped with terminals 7A and terminals 6A, secondary coil T74 is equipped with terminals 5A and terminals 4A, terminals 7A, terminals 6A, connects Line end 5A and terminals 4A are arranged successively；The primary coil of the driving transformer T8 is by primary coil T81 and primary coil T82 Composition, primary coil T81 and primary coil T82 are equipped with common terminal 2B, and primary coil T81 is additionally provided with terminals 1B, primary Coil T82 is additionally provided with terminals 3B, and terminals 1A is connect with terminals 1B, and terminals 2B connects control after connecting with terminals 2A Power supply 9, terminals 3A are connect with terminals 3B, the secondary coil of driving transformer T8 by the secondary coil T83 that is connected in parallel and Secondary coil T84 composition, secondary coil T83 are equipped with terminals 7B and terminals 6B, and secondary coil T84 is equipped with terminals 5B and connects Line end 4B, terminals 7B, terminals 6B, terminals 5B and terminals 4B are arranged successively.If primary coil T71 and primary coil It is identical to generate current direction for T81 work, if primary coil T72 and primary coil T82 work, generates current direction and primary The current direction that coil T71 and primary coil T81 is generated when working is opposite.By the above-mentioned two groups of primary coils of on-off, from And secondary coil T73, secondary coil T74, secondary coil T83, secondary coil T84 is made to generate two kinds of contrary electric currents, side Just bridge switching circuit is controlled.

Bridge switching circuit 10 includes four groups of switch protecting circuits 11, and the switch protecting circuit includes protection 12 He of circuit Switching circuit 13, protection circuit 12 include the end voltage source E1 and the end voltage source E2, triode V9, diode D11, load resistance The base stage connection base resistance R26 of R30, collector load resistor R14, base resistance R26, voltage source resistance R8, triode V9, The other end of base resistance R26 connects the end E1 of voltage source with the cathode of diode D11, and the emitter of triode V9 connects two poles The anode of pipe D11, the collector of triode V9 connect collector load resistor R14, the other end of collector load resistor R14 and The end load resistance R30 connection voltage source resistance R8, voltage source resistance R8 connection voltage source E2, the other end of load resistance R30 with The emitter connection of the anode and triode V9 of diode D11；Switching circuit include output end E3, output end E4, metal-oxide-semiconductor Q3 and Switch RC mould group, drain electrode mould group one end connection switch RC of the metal-oxide-semiconductor Q3 and the source electrode connection of output end E3, metal-oxide-semiconductor Q3 are opened The other end and output end E4 of RC mould group are closed, the source electrode of metal-oxide-semiconductor Q3 is connect with the anode of diode D11, the grid warp of metal-oxide-semiconductor Q3 The overvoltage source end resistance R8 connection voltage source E2, switch RC mould group both ends are separately connected output end E3 and output end E4, switch RC Mould group is composed in series by the resistance R34 and capacitor C18 being connected in series；If the end voltage source E2 is high level, then the end voltage source E1 is Low level, in this state, the grid of metal-oxide-semiconductor Q3 obtain cut-in voltage, so that the drain electrode of the source electrode of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q3 The base stage of conducting, triode V9 is low level, and triode V9 is not turned on；If the end voltage source E2 is low level, the then end voltage source E1 For high level, in this state, the grid of metal-oxide-semiconductor Q3 is low level, so that the drain electrode of the source electrode of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q3 are not Conducting, the base stage of triode V9 are high level, and the grid of metal-oxide-semiconductor Q3 is connected to by triode V9 conducting with the source electrode of metal-oxide-semiconductor Q3, The residual voltage because disconnecting generation after metal-oxide-semiconductor Q3 conduction is discharged, plays the role of protecting metal-oxide-semiconductor Q3；Meanwhile switch RC mould group Releasing loop is provided for this inverse peak voltage, prevents metal-oxide-semiconductor Q3 reverse breakdown.

The end voltage source E1 of first group of switch protecting circuit 1000 is connect with the terminals 6A of driving transformer T7, and first group The end voltage source E2 of switch protecting circuit 1000 is connect with the terminals 7A of driving transformer T7, first group of switch protecting circuit 1000 end voltage source E3 is connect with 2 output end of transformer rectifier circuit, the end voltage source E4 of first group of switch protecting circuit 1000 It is connect with the terminals 1C of driving transformer T5；The end voltage source E2 of second group of switch protecting circuit 2000 and driving transformer T8 Terminals 5B connection, the terminals 4B of the end voltage source E1 of second group of switch protecting circuit 2000 and driving transformer T8 connects It connects, the end voltage source E3 of second group of switch protecting circuit 2000 is connect with the terminals 2D of transformer T6, second group of switch protection The end voltage source E4 of circuit 2000 is connect with ground terminal AGND；The end voltage source E1 of third group switch protecting circuit 3000 and driving The terminals 7B connection of transformer T8, the end voltage source E2 of third group switch protecting circuit 3000 and the wiring of driving transformer T7 6B connection is held, the end voltage source E3 of third group switch protecting circuit 3000 is connect with the output end of transformer rectifier circuit 2, third group The end voltage source E4 of switch protecting circuit 3000 is connect with the terminals 2D of driving transformer T6, the 4th group of switch protecting circuit 4000 end voltage source E2 is connect with the terminals 4A of driving transformer T7, the voltage source E1 of the 4th group of switch protecting circuit 4000 End is connect with the terminals 5A of driving transformer T7, and the end voltage source E3 of the 4th group of switch protecting circuit 4000 is with transformer T5's Terminals 1C connection, the end voltage source E4 of the 4th group of switch protecting circuit 4000 are connect with ground terminal AGND.If primary coil T71 It works with primary coil T81, the end voltage source E2 of first group of switch protecting circuit 1000 and second group of switch protecting circuit 2000 For high level, the end voltage source E1 of first group of switch protecting circuit 1000 and second group of switch protecting circuit 2000 is low level, The end voltage source E2 of third group switch protecting circuit 3000 and the 4th group of switch protecting circuit 4000 is low level, third group switch Protecting the end voltage source E1 of circuit 3000 and the 4th group of switch protecting circuit 4000 is high level, first group of switch protecting circuit 1000 and the metal-oxide-semiconductor Q3 grid of second group of switch protecting circuit 2000 obtain cut-in voltage, first group of switch protecting circuit 1000 With the metal-oxide-semiconductor Q3 conducting of second group of switch protecting circuit 2000, electric current successively passes through transformer rectifier circuit, first group of switch protection The metal-oxide-semiconductor Q3 of circuit, primary coil T50, primary coil T60 and second group of switch protecting circuit 2000 metal-oxide-semiconductor Q3 after with connect Ground terminal AGND connection forming circuit, primary coil T50 and primary coil T60 obtain forward voltage；If primary coil T72 and primary The end voltage source E2 of coil T82 work, first group of switch protecting circuit 1000 and second group of switch protecting circuit 2000 is low electricity Flat, the end voltage source E1 of first group of switch protecting circuit 1000 and second group of switch protecting circuit 2000 is high level, third group The end voltage source E2 of switch protecting circuit 3000 and the 4th group of switch protecting circuit 4000 is high level, third group switch protection electricity Road 3000 and the end voltage source E1 of the 4th group of switch protecting circuit 4000 are low level, third group switch protecting circuit and the 4th group The metal-oxide-semiconductor Q3 grid of switch protecting circuit obtains cut-in voltage, third group switch protecting circuit and the 4th group of switch protecting circuit Metal-oxide-semiconductor Q3 conducting, electric current successively passes through metal-oxide-semiconductor Q3, the primary coil of transformer rectifier circuit, third group switch protecting circuit Forming circuit, primary coil are connect with ground terminal AGND after T60, primary coil T50 and the 4th group of switch protecting circuit metal-oxide-semiconductor Q3 T50 and primary coil T60 obtains backward voltage；Such first group of switch protecting circuit and second group of switch protecting circuit work, Third group switch protecting circuit and the 4th group of switch protecting circuit do not work, and alternately and repeatedly work, the direct current after rectification is led to It is input in rectification circuit 5 after crossing transformer T5 and transformer T6 transformation.

It is high-power to attack that put control circuit 8 include that first group of high-power attack puts control protection electric circuit 14 and second group high-power is attacked Put control protection electric circuit 15.

Described first group high-power to attack that put control protection electric circuit 14 include the first signal source input terminal S1, resistance R18, two poles The collector of pipe D7, base resistance R23 and triode V8, triode V8 are connect with load end F1, the emitter of triode V8 with Ground terminal DGND connection, the base stage of triode V8 are connect with base resistance R23, and the cathode of base resistance R23 and diode D7 connect It connects, anode the first signal source input terminal S1 of connection of diode D7 connects between the first signal source input terminal S1 and ground terminal DGND Connecting resistance R18.

Described second group high-power to attack that put control protection electric circuit 15 include second signal source input terminal S2, resistance R19, two poles Pipe D6, base resistance R22 triode V7 and load end F2, the collector of triode V7 are connect with load end F2, triode V7's Emitter is connect with ground terminal DGND, and the base stage of triode V7 is connect with base resistance R22, base resistance R22 and diode D6 Cathode connection, diode D6 anode connection second signal source input terminal S2, second signal source input terminal S2 and ground connection DGND Between connect resistance R19.

Base resistance R23 makes triode V8 emitter be in forward bias, and provides size base current appropriate, so that Amplifying circuit obtains suitable operating point, and resistance R18 has the function of shunting, electric current when diode D6 prevents triode V8 from failing Reverse flow damages signal element；Similarly second group of high-power attack puts control protection electric circuit 15 and first group of high-power attack puts control The system protection corresponding electronic component of circuit 14 has phase same-action；If the first signal source input terminal S1 has an input current signal, three The base stage of pole pipe V8 obtains enough electric currents and saturation conduction, the i.e. collector and emitter of triode V8 are connected, and connects load end The loaded work piece connect；Same second group high-power attack put control protection electric circuit 15 working principle it is identical；When the first signal source is defeated Enter to hold S1 and second signal source input terminal S2 interval to work alternatively, load can discontinuous operation.

The collector of the triode V8 connects the both ends of the first RC mould group, the first RC with the emitter of triode V8 Mould group is composed in series by resistance R24 and capacitor C19；The collector of the triode V7 connects second with the emitter of triode V7 The both ends of RC mould group, the 2nd RC mould group are composed in series by resistance R25 and capacitor C20；The diode D7 anode with open The base stage connection of pipe Q8 is closed, the cathode of diode D7 is connect with the emitter of switching tube Q8, and the collector of switching tube Q8 connects Ground terminal DGND；The anode of the diode D6 is connect with the base stage of switching tube Q9, the cathode of diode D6 and the hair of switching tube Q9 The collector of emitter-base bandgap grading connection, switching tube Q9 connects ground terminal DGND；First RC mould group is identical with the effect of the 2nd RC mould group, capacitor Voltage jump is prevented, absorbs the overvoltage of kurtosis, concatenated resistance plays damping action, the energy of resistance consumption overvoltage, To the oscillation of suppression circuit.For switching tube Q8, when S1 is low level, triode V8 is disconnected, the base of switching tube Q8 Extremely low level, since triode V8 has remaining electricity in the moment of disconnection, high electricity is generated on the emitter of switching tube Q8 Flat, switching tube Q8 conducting discharges remaining electricity, plays the role of protection.The effect for acting on Q8 of switching tube Q9 is identical.

The terminals 1B of the terminals 1A and transformer T8 of the transformer T7 connect load end F1, the transformer T7's Terminals 3A connects load end F2 with the terminals 3B of transformer T8；When the first signal source input terminal S1 has input signal, three poles The collector and emitter of pipe V8 is connected, primary coil T71 and primary coil T81 work, secondary coil T73, secondary coil T74, secondary coil T83, secondary coil T83 generate forward current, provide forward current for four groups of switch protecting circuits；When second Signal source input terminal S2 has input current signal, the collector and emitter conducting of triode V7, primary coil T72 and primary line T82 work is enclosed, it is four groups that secondary coil T73, secondary coil T74, secondary coil T83, secondary coil T83, which generate reverse current, Switch protecting circuit provides reverse current.

Dual transformer switching power circuit protection circuit includes pwm chip, triode V3, triode V4, protection RC Mould group, resistance R20 and polar capacitor C34, pwm chip include terminals CSS, power end VC, power end VCC, output end OUT A, output end OUT B and input terminal INV IN, input terminal INV IN are connect with ground terminal DGND, output end OUT A connection First signal source input terminal S1, output end OUT B connection second signal source input terminal S2, power end VC are connected with power end VCC Power supply is controlled, terminals CSS is connect with polar capacitor C34 anode, and polar capacitor C34 cathode connects ground terminal DGND, triode The collector of V4 is connected with polar capacitor C34 anode, and the emitter of triode V4 is connected with polar capacitor C34 cathode, triode The base stage of V4 is connected with triode V3 emitter, and the collector of triode V3 and the collector of V4 connect, the base stage of triode V3 It is connect with resistance R20, the other end connection protection signal source of resistance R20, one end of protection RC mould group is connected to resistance R20 and three Between the base stage of pole pipe V3, the other end of protection RC mould group connects ground terminal DGND, protects RC mould group by capacitor C14 and resistance R43 is composed in parallel；The interference signal that the effect of protection RC mould group inhibits power source internal to generate enters circuit；Signal source is protected to pass through Resistance R20, resistance R20 are biasing resistor, provide size base current appropriate, when the base stage of triode V3 obtains cut-in voltage When, triode V3 conducting, after triode V3 conducting, triode V4 conducting, the both ends polar capacitor C34 are connected, and formation is quickly put Electricity, after polar capacitor C34 electric discharge, pwm chip stops working, and protects dual transformer Switching Power Supply, so that it is whole to reach protection The effect of a circuit.High-power attack is put by control circuit on-off controls by output end OUT A and output end OUT B, makes Output end obtains a series of equal pulse of amplitudes.

Protection signal source include the temperature protection signal being connected in parallel, attack put protection signal and power supply other protection signals, Temperature protection signal is connect after diode D8 with resistance R20, attacks to put and signal is protected to connect after diode D9 with resistance R20 It connects, other protection signals of power supply are connect after diode D10 with resistance R20；It is prevented by the function of diode unilateral conduction Electric current adverse current, protection obtain the element of protection signal.

Compared with prior art, the utility model has the beneficial effects that the utility model first directly carries out alternating current Rectifying and wave-filtering is then input in transformer circuit, protects circuit and high-power attack to put control using dual transformer switching power circuit Circuit control transformer circuit processed, the voltage for making transformer T5 and T6 alternating outbound course opposite is finally by rectification circuit and filter Wave circuit is input to output end and uses for power amplifier, since the primary of transformer circuit uses concatenated primary coil, transformer Therefore the parallel connection of secondary windings of circuit allows the output of the power circuit to stablize.The bridge switching circuit of the utility model has certainly The protective effect of body, high-power attack put the protective effect that control circuit has itself.Compared with the existing technology, dual transformer switchs The structure of power circuit protection circuit is able to achieve quick protection, improves the safety of circuit.

Claims (10)

1. a kind of High-power amplifier dual transformer switching power circuit, including input terminal, transformer circuit and output end, feature Be: further include transformer rectifier circuit, dual transformer switching power circuit protection circuit, it is high-power attack put control circuit, rectification Circuit, filter circuit, control power supply, driving transformer T7 and driving transformer T8；The transformer rectifier circuit connects input terminal； The transformer circuit includes bridge switching circuit, transformer T5, transformer T6, and the primary coil T50 of transformer T5, which is equipped with, to be connect The primary coil T60 of line end 1C and terminals 2C, transformer T6 are equipped with terminals 1D and terminals 2D, terminals 2C and terminals 1D connection, terminals 1C connects by bridge switching circuit with transformer rectifier circuit, terminals 2D pass through bridge switching circuit and Ground terminal AGND connection, primary coil T50 connect with primary coil T60；The secondary coil of transformer T5 by secondary coil T51, Secondary coil T52, secondary coil T53 and secondary coil T54 composition, the secondary coil of transformer T6 is by secondary coil T61, secondary Coil T62, secondary coil T63 and secondary coil T64 are formed, and are connected after the secondary coil of transformer T5 and the parallel connection of secondary windings of T6 Rectification circuit is connect, the output end of rectification circuit connects filter circuit, and the output end of filter circuit connects output end；Bridge switch electricity Road connection driving transformer T7 and driving transformer T8, driving transformer T7 and driving transformer T8 and high-power attack put control electricity Road connection, dual transformer switching power circuit protection high-power attack of circuit connection put control circuit, dual transformer switch power supply Road protection circuit, driving transformer T7 connect control power supply with driving transformer T8.

2. a kind of High-power amplifier dual transformer switching power circuit according to claim 1, it is characterised in that: described to connect Line end 1C is connect with one end of RC mould group, and terminals 2D is connect with the other end of RC mould group, and the transformation RC mould group is by resistance R37 It is composed in series with capacitor C21.

3. a kind of High-power amplifier dual transformer switching power circuit according to claim 1, it is characterised in that: the drive The primary coil of dynamic transformer T7 is made of primary coil T71 and primary coil T72, and primary coil T71 and primary coil T72 are set There are common terminal 2A, primary coil T71 to be additionally provided with terminals 1A, primary coil T72 is additionally provided with terminals 3A, driving transformer The secondary coil of T7 is made of the secondary coil T73 and secondary coil T74 being connected in parallel, and secondary coil T73 is equipped with terminals 7A Terminals 5A and terminals 4A, terminals 7A, terminals 6A, terminals 5A and wiring are equipped with terminals 6A, secondary coil T74 End 4A is arranged successively；The primary coil of the driving transformer T8 is made of primary coil T81 and primary coil T82, primary line It encloses T81 and primary coil T82 and is equipped with common terminal 2B, primary coil T81 is additionally provided with terminals 1B, and primary coil T82 is separately set There are terminals 3B, terminals 1A to connect with terminals 1B, connection control power supply, terminals after terminals 2B is connect with terminals 2A 3A is connect with terminals 3B, and the secondary coil of driving transformer T8 is by the secondary coil T83 and secondary coil T84 group that are connected in parallel At secondary coil T83 is equipped with terminals 7B and terminals 6B, and secondary coil T84 is equipped with terminals 5B and terminals 4B, terminals 7B, terminals 6B, terminals 5B and terminals 4B are arranged successively.

4. a kind of High-power amplifier dual transformer switching power circuit according to claim 3, it is characterised in that: the bridge Formula switching circuit includes four groups of switch protecting circuits, and the switch protecting circuit includes protection circuit and switching circuit, protection electricity Road include the end voltage source E1, the end voltage source E2, triode V9, diode D11, load resistance R30, collector load resistor R14, Base resistance R26 and voltage source resistance R8；The base stage of triode V9 connects base resistance R26, the other end of base resistance R26 and The end E1 of the cathode connection voltage source of diode D11, the anode of the emitter connection diode D11 of triode V9, triode V9 Collector connect collector load resistor R14, the other end of collector load resistor R14 connects voltage with load resistance R30 The end source resistance R8, voltage source resistance R8 connection voltage source E2, the other end of load resistance R30 and the anode and three of diode D11 The emitter of pole pipe V9 connects；Switching circuit includes output end E3, output end E4, metal-oxide-semiconductor Q3 and switch RC mould group, the MOS Pipe Q3 drains the other end of source electrode connection switch RC mould group of the mould group one end connection switch RC and output end E3, metal-oxide-semiconductor Q3 and defeated The source electrode of outlet E4, metal-oxide-semiconductor Q3 are connect with the anode of diode D11, and the grid of metal-oxide-semiconductor Q3 is by voltage source resistance R8 connection electricity The end potential source E2, the mould group both ends switch RC connect output end E3 and output end E4, switch RC mould group by the resistance R34 that is connected in series with Capacitor C18 is composed in series.

5. a kind of High-power amplifier dual transformer switching power circuit according to claim 4, it is characterised in that: first group The end voltage source E1 of switch protecting circuit is connect with the terminals 6A of driving transformer T7, the voltage of first group of switch protecting circuit The source end E2 is connect with the terminals 7A of driving transformer T7, the end voltage source E3 of first group of switch protecting circuit and rectifier transformer electricity The output end on road connects, and the end voltage source E4 of first group of switch protecting circuit is connect with the terminals 1C of driving transformer T5, the The end voltage source E2 of two groups of switch protecting circuits is connect with the terminals 5B of driving transformer T8, second group of switch protecting circuit The end voltage source E1 is connect with the terminals 4B of driving transformer T8, the end voltage source E3 of second group of switch protecting circuit and transformer The terminals 2D connection of T6, the end voltage source E4 of second group of switch protecting circuit is connect with ground terminal AGND；Third group switch is protected The end voltage source E1 of protection circuit is connect with the terminals 7B of driving transformer T8, the end voltage source E2 of third group switch protecting circuit Connect with the terminals 6B of driving transformer T7, the end voltage source E3 of third group switch protecting circuit and transformer rectifier circuit it is defeated Outlet connection, the end voltage source E4 of third group switch protecting circuit are connect with the terminals 2D of driving transformer T6, and the 4th group is opened The end voltage source E2 for closing protection circuit is connect with the terminals 4A of driving transformer T7, the voltage source of the 4th group of switch protecting circuit The end E1 is connect with the terminals 5A of driving transformer T7, the 4th group of end voltage source E3 of switch protecting circuit and connecing for transformer T5 Line end 1C connection, the end voltage source E4 of the 4th group of switch protecting circuit are connect with ground terminal AGND.

6. a kind of High-power amplifier dual transformer switching power circuit according to claim 4, it is characterised in that: described big Power attack put control circuit include first group it is high-power attack put control protection electric circuit and second group it is high-power attack put control protection electricity Road, described first group high-power to attack that put control protection electric circuit include the first signal source input terminal S1, resistance R18, diode D7, base The collector of electrode resistance R23 and triode V8, triode V8 are connect with load end F1, the emitter and ground terminal of triode V8 The base stage of DGND connection, triode V8 is connect with base resistance R23, and base resistance R23 is connect with the cathode of diode D7, two poles Anode the first signal source input terminal S1 of connection of pipe D7, connects resistance between the first signal source input terminal S1 and ground terminal DGND R18；Described second group high-power attack put control protection electric circuit include second signal source input terminal S2, resistance R19, diode D6, The collector of base resistance R22, triode V7 and load end F2, triode V7 are connect with load end F2, the transmitting of triode V7 Pole is connect with ground terminal DGND, and the base stage of triode V7 is connect with base resistance R22, and base resistance R22 and diode D6's is negative Pole connection, between the anode connection second signal source input terminal S2, second signal source input terminal S2 and ground connection DGND of diode D6 Connect resistance R19.

7. a kind of High-power amplifier dual transformer switching power circuit according to claim 6, it is characterised in that: described three The collector of pole pipe V8 connects the both ends of the first RC mould group with the emitter of triode V8, and the first RC mould group is by resistance R24 It is composed in series with capacitor C19；The collector of the triode V7 connects the both ends of the 2nd RC mould group with the emitter of triode V7, The 2nd RC mould group is composed in series by resistance R25 and capacitor C20；The anode of the diode D7 connects with the base stage of switching tube Q8 It connects, the cathode of diode D7 is connect with the emitter of switching tube Q8, and the collector of switching tube Q8 connects ground terminal DGND；Described two The anode of pole pipe D6 is connect with the base stage of switching tube Q9, and the cathode of diode D6 is connect with the emitter of switching tube Q9, switching tube The collector of Q9 connects ground terminal DGND.

8. a kind of High-power amplifier dual transformer switching power circuit according to claim 6, it is characterised in that: the change The terminals 1B of the terminals 1A and transformer T8 of depressor T7 connect load end F1, the terminals 3A and transformation of the transformer T7 The terminals 3B connection load end F2 of device T8.

9. a kind of High-power amplifier dual transformer switching power circuit according to claim 8, it is characterised in that: double transformations Device switching power circuit protection circuit include pwm chip, triode V3, triode V4, protection RC mould group, resistance R20 and Polar capacitor C34, pwm chip include terminals CSS, power end VC, power end VCC, output end OUT A, output end OUT B and input terminal INV IN, input terminal INV IN are connect with ground terminal DGND, output end OUT A connection the first signal source input terminal S1, output end OUT B connection second signal source input terminal S2, power end VC connect control power supply, terminals with power end VCC CSS is connect with polar capacitor C34 anode, and polar capacitor C34 cathode connects ground terminal DGND, the collector and polarity of triode V4 The connection of capacitor C34 anode, the emitter of triode V4 are connected with polar capacitor C34 cathode, the base stage and triode of triode V4 The connection of V3 emitter, the collector of triode V3 and the collector of V4 connect, and the base stage of triode V3 is connect with resistance R20, electricity Hinder R20 the other end connection protection signal source, protection RC mould group one end be connected to resistance R20 and triode V3 base stage it Between, the other end of protection RC mould group connects ground terminal DGND, and protection RC mould group is composed in parallel by capacitor C14 and resistance R43.

10. a kind of High-power amplifier dual transformer switching power circuit according to claim 9, it is characterised in that: described Protection signal source include the temperature protection signal being connected in parallel, attack put protection signal and power supply other protection signals, overheating protection Signal is connect after diode D8 with resistance R20, attacks to put and signal is protected to connect after diode D9 with resistance R20, power supply Other protection signals are connect after diode D10 with resistance R20.