CN209030103U - A kind of transformer circuit - Google Patents

Abstract

The utility model relates to power technique fields, more particularly to a kind of transformer circuit, including bridge switching circuit, transformer T5, transformer T6, the primary coil T50 of transformer T5 is equipped with terminals 1C and terminals 2C, the primary coil T60 of transformer T6 is equipped with terminals 1D and terminals 2D, terminals 2C is connected with terminals 1D, terminals 1C is connect by bridge switching circuit with input power, terminals 2D is connect by bridge switching circuit with ground terminal AGND, and primary coil T50 connects with primary coil T60；The secondary coil of transformer T5 is made of secondary coil T51, secondary coil T52, secondary coil T53 and secondary coil T54, the secondary coil of transformer T6 is made of secondary coil T61, secondary coil T62, secondary coil T63 and secondary coil T64, output end is connected after the secondary coil of transformer T5 and the parallel connection of secondary windings of T6, bridge switching circuit connects DC voltage input end.The structure meets the high-power output of power amplifier, reduces volume, improves output stability.

Description

A kind of transformer circuit

Technical field

The utility model relates to power technique fields, and in particular to a kind of transformer circuit.

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.High-power amplifier is mainly answered 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 The stability and reliability that High-power amplifier needs continuous high power to export.The capacitor filtering rectification that general High-power amplifier uses 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.Patent document CN1553700A discloses a kind of dual transformer Switching Power Supply, mainly includes energy storage in circuit Voltage filter capacitor, suction peak voltage circuit, switch and voltage control triode, transformer etc., by two transformers --- and it is main Transformer and teaser transformer, they, which are connected in parallel, forms switching tube load, and removing high-power combustion in circuit can load.But this Kind dual transformer Switching Power Supply is not able to satisfy the power requirement of High-power amplifier, if exporting in long-time high power, high sound pressure Used in High-power amplifier, still will lead to power amplifier fever, power amplifier internal temperature increase the case where, eventually lead to power amplifier and burn.

Summary of the invention

To solve problems of the prior art, the utility model provides a kind of transformer circuit, meets the height of power amplifier Power output reduces volume, improves output stability.

A kind of to achieve the above purpose, the technical solution of the present invention is: transformer circuit includes bridge switching circuit, The primary coil T50 of transformer T5, transformer T6, transformer T5 are equipped with terminals 1C and terminals 2C, the primary of transformer T6 Coil T60 is equipped with terminals 1D and terminals 2D, and terminals 2C is connected with terminals 1D, and terminals 1C passes through bridge switching circuit It is connect with input power, terminals 2D is connect by bridge switching circuit with ground terminal AGND, primary coil T50 and primary coil T60 series connection；The secondary coil of transformer T5 is 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 group At connecting output end after the secondary coil of transformer T5 and the parallel connection of secondary windings of T6, bridge switching circuit connects DC voltage Input terminal.The primary coil of transformer T5 and T6 in transformer circuit form series circuit, are replaced by bridge switching circuit Input, the electric current opposite to the primary coil input direction of transformer T5 and T6, output electric current instant response speed is high, voltage Good output.The secondary coil formation of transformer T5 and T6 are connected in parallel, and secondary current superposition exports big function to meet The needs of rate improve the stability of output.

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 C21 prevents voltage jump, absorbs the mistake of kurtosis Voltage, concatenated resistance R37 rise damping actions, resistance disappear R37 consumption overvoltage energy, thus the oscillation of suppression 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, and in this state, the grid of metal-oxide-semiconductor Q3 obtains Cut-in voltage is obtained, so that the drain electrode of the source electrode of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q3 are connected, the base stage of triode V9 is low level, triode V9 is not turned on；If the end voltage source E2 is low level, then the end voltage source E1 is high level, and 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 turned on, the base stage of triode V9 is high level, triode V9 Conducting, the grid of metal-oxide-semiconductor Q3 is connected to the source electrode of metal-oxide-semiconductor Q3, is discharged because disconnecting the remnants electricity generated after metal-oxide-semiconductor Q3 conduction Pressure plays the role of protecting metal-oxide-semiconductor Q3；Meanwhile switch RC mould group provides Releasing loop for this inverse peak voltage, prevents MOS Pipe Q3 reverse breakdown.

Further, the end voltage source E1 of first group of switch protecting circuit is connect with terminals 6A, first group of switch protection The end voltage source E2 of circuit is connect with terminals 7A, the end voltage source E3 of first group of switch protecting circuit and DC voltage input end Connection, the end voltage source E4 of first group of switch protecting circuit are connect with the terminals 1C of driving transformer T5, and second group of switch is protected The end voltage source E2 of protection circuit is connect with terminals 5B, and the end voltage source E1 of second group of switch protecting circuit and terminals 4B connect It connects, the end voltage source E3 of second group of switch protecting circuit is connect with the terminals 2D of transformer T6, second group of switch protecting circuit The end voltage source E4 connect with ground terminal AGND；The end voltage source E1 of third group switch protecting circuit is connect with terminals 7B, the The end voltage source E2 of three groups of switch protecting circuits is connect with terminals 6B, the end voltage source E3 of third group switch protecting circuit and straight Voltage input end connection is flowed, the end voltage source E4 of third group switch protecting circuit is connect with the terminals 2D of driving transformer T6, The end voltage source E2 of 4th group of switch protecting circuit is connect with terminals 4A, the end voltage source E1 of the 4th group of switch protecting circuit with Terminals 5A connection, the end voltage source E3 of the 4th group of switch protecting circuit are connect with the terminals 1C of transformer T5, and the 4th group is opened The end voltage source E4 for closing protection circuit is connect with ground terminal AGND.If first group of switch protecting circuit and second group of switch protection electricity The end voltage source E2 on road is high level, and the end voltage source E1 of first group of switch protecting circuit and second group of switch protecting circuit is low The end voltage source E2 of level, third group switch protecting circuit and the 4th group of switch protecting circuit is low level, and third group switch is protected The end voltage source E1 of protection circuit and the 4th group of switch protecting circuit is high level, first group of switch protecting circuit and second group of switch The metal-oxide-semiconductor Q3 grid of circuit is protected to obtain cut-in voltage, the MOS of first group of switch protecting circuit and second group of switch protecting circuit Pipe Q3 conducting, electric current successively pass through the metal-oxide-semiconductor Q3 of first group of switch protecting circuit, primary coil T50, primary coil T60 and the Forming circuit, primary coil T50 and primary coil T60 are connect after the metal-oxide-semiconductor Q3 of two groups of switch protecting circuits with ground terminal AGND Obtain forward voltage；If the end voltage source E2 of first group of switch protecting circuit and second group of switch protecting circuit is low level, the The end voltage source E1 of one group of switch protecting circuit and second group of switch protecting circuit be high level, third group switch protecting circuit and The end voltage source E2 of 4th group of switch protecting circuit is high level, third group switch protecting circuit and the 4th group of switch protecting circuit The end voltage source E1 be low level, the metal-oxide-semiconductor Q3 grid of third group switch protecting circuit and the 4th group of switch protecting circuit obtains The metal-oxide-semiconductor Q3 conducting of cut-in voltage, third group switch protecting circuit and the 4th group of switch protecting circuit, electric current successively pass through third After the metal-oxide-semiconductor Q3, primary coil T60, primary coil T50 and the 4th group of switch protecting circuit metal-oxide-semiconductor Q3 that organize switch protecting circuit Forming circuit is connect with ground terminal AGND, primary coil T50 and primary coil T60 obtain backward voltage；Such first group of switch Protect circuit and the work of second group of switch protecting circuit, third group switch protecting circuit and the 4th group of switch protecting circuit not work Make, alternately and repeatedly work, the direct current after rectification is exported by transformer T5 and T6.

Compared with prior art, the utility model has the beneficial effects that the utility model is defeated by transformer T5 and T6 alternating Contrary voltage is used to output end for power amplifier out, since the primary of transformer circuit uses concatenated primary coil, Therefore the parallel connection of secondary windings of transformer circuit allows the output of the power circuit to stablize.

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 is that driving transformer T7 connects High-power amplifier control circuit working principle diagram with driving transformer T8.

Fig. 6 is first group of High-power amplifier 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 power amplification 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 connect with High-power amplifier control circuit 8, and dual transformer switching power circuit protects circuit 7 to connect High-power amplifier 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.

High-power amplifier control circuit 8 includes first group of High-power amplifier control protection electric circuit 14 and second group of high-power function Put control protection electric circuit 15.

First group of High-power amplifier control protection electric circuit 14 includes 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.

Second group of High-power amplifier control protection electric circuit 15 includes 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 amplifier control protection electric circuit 15 and first group of High-power amplifier 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；The working principle of same second group of High-power amplifier control protection electric circuit 15 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 amplifier control circuit on-off is controlled by output end OUT A and output end OUT B, is made Output end obtains a series of equal pulse of amplitudes.

Protection signal source includes other protection signals of the temperature protection signal being connected in parallel, power amplifier protection signal and power supply, Temperature protection signal is connect after diode D8 with resistance R20, and power amplifier protects signal 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 amplifier 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 amplifier control circuit have the protective effect of 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 (4)

1. a kind of transformer circuit, it is characterised in that: including bridge switching circuit, transformer T5, transformer T6, transformer T5's Primary coil T50 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 by bridge switching circuit with input power, and terminals 2D passes through Bridge switching circuit is connect with ground terminal AGND, and primary coil T50 connects with primary coil T60；The secondary coil of transformer T5 It is made of secondary coil T51, secondary coil T52, secondary coil T53 and secondary coil T54, the secondary coil of transformer T6 is by secondary Grade coil T61, secondary coil T62, secondary coil T63 and secondary coil T64 composition, time of the secondary coil and T6 of transformer T5 Output end is connected after grade coils from parallel connection of coils, bridge switching circuit connects DC voltage input end.

2. a kind of transformer circuit according to claim 1, it is characterised in that: one end of the terminals 1C and RC mould group Connection, terminals 2D are connect with the other end of RC mould group, and the transformation RC mould group is composed in series by resistance R37 and capacitor C21.

3. a kind of transformer circuit according to claim 1, it is characterised in that: the bridge switching circuit includes four groups and opens Protection circuit is closed, the switch protecting circuit includes protection circuit and switching circuit, and protection circuit includes the end voltage source E1, voltage The source end E2, triode V9, diode D11, load resistance R30, collector load resistor R14, base resistance R26 and voltage source electricity Hinder R8；The base stage of triode V9 connects base resistance R26, and the other end of base resistance R26 connects electricity with the cathode of diode D11 The end E1 of potential source, the anode of the emitter connection diode D11 of triode V9, the collector of triode V9 connect collector load The other end of resistance R14, collector load resistor R14 connect voltage source resistance R8 with load resistance R30, and voltage source resistance R8 connects The end voltage source E2 is connect, the other end of load resistance R30 is connect with the emitter of the anode of diode D11 and triode V9；Switch Circuit includes output end E3, output end E4, metal-oxide-semiconductor Q3 and switch RC mould group, the metal-oxide-semiconductor Q3 drain electrode connection switch RC mould group one End and output end E3, the other end and output end E4 of the source electrode connection switch RC mould group of metal-oxide-semiconductor Q3, the source electrode of metal-oxide-semiconductor Q3 and two The anode connection of pole pipe D11, the grid of metal-oxide-semiconductor Q3 pass through the end voltage source resistance R8 connection voltage source E2, switch RC mould group both ends Output end E3 and output end E4 is connected, switch RC mould group is composed in series by the resistance R34 and capacitor C18 being connected in series.

4. a kind of transformer circuit according to claim 3, it is characterised in that: the voltage source of first group of switch protecting circuit The end E1 is connect with terminals 6A, and the end voltage source E2 of first group of switch protecting circuit is connect with terminals 7A, and first group of switch is protected The end voltage source E3 of protection circuit is connect with DC voltage input end, and the end voltage source E4 of first group of switch protecting circuit and driving become The terminals 1C connection of depressor T5, the end voltage source E2 of second group of switch protecting circuit are connect with terminals 5B, second group of switch The end voltage source E1 of protection circuit is connect with terminals 4B, and the end voltage source E3 of second group of switch protecting circuit is with transformer T6's Terminals 2D connection, the end voltage source E4 of second group of switch protecting circuit are connect with ground terminal AGND；Third group switch protection electricity The end voltage source E1 on road is connect with terminals 7B, and the end voltage source E2 of third group switch protecting circuit is connect with terminals 6B, the The end voltage source E3 of three groups of switch protecting circuits is connect with DC voltage input end, the voltage source E4 of third group switch protecting circuit End is connect with the terminals 2D of driving transformer T6, and the end voltage source E2 of the 4th group of switch protecting circuit is connect with terminals 4A, The end voltage source E1 of 4th group of switch protecting circuit is connect with terminals 5A, the end voltage source E3 of the 4th group of switch protecting circuit with The terminals 1C connection of transformer T5, the end voltage source E4 of the 4th group of switch protecting circuit is connect with ground terminal AGND.