CN209472567U - A kind of bridge switching circuit - Google Patents
A kind of bridge switching circuit Download PDFInfo
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- CN209472567U CN209472567U CN201822060895.4U CN201822060895U CN209472567U CN 209472567 U CN209472567 U CN 209472567U CN 201822060895 U CN201822060895 U CN 201822060895U CN 209472567 U CN209472567 U CN 209472567U
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Abstract
The utility model relates to a kind of bridge switching circuits; including four groups of switch protecting circuits; switch protecting circuit includes protection circuit and switching circuit, and protection circuit includes 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；Switching circuit includes output end E3, output end E4, metal-oxide-semiconductor Q3 and switch RC mould group; described drain electrode mould group one end connection switch RC metal-oxide-semiconductor Q3 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 is connect with the anode of diode D11; the grid of metal-oxide-semiconductor Q3 passes through 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; circuit and switching circuit is protected to cooperate; meet the high-power output of Switching Power Supply, stablizes the waveform of output rectified voltage.
Description
Technical field
The utility model relates to power technique fields, and in particular to a kind of bridge switching 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.Requirement of the High-power amplifier to Switching Power Supply is very high,
It needs to be corrected input current, makes its sineization, the power factor of Lai Tigao system.Current powerful power factor school
The exactly Important Problems of high power switching power supply technical research.
Summary of the invention
To solve problems of the prior art, the utility model provides a kind of bridge switching circuit, meets switch electricity
The high-power output in source stablizes the waveform of output rectified voltage.
A kind of to achieve the above purpose, the technical solution of the present invention is: bridge switching circuit, the bridge switch electricity
Road includes four groups of switch protecting circuits, and the switch protecting circuit includes protection circuit and switching circuit, and protection circuit includes electricity
The end potential 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 and diode of base resistance R26
The end E1 of the cathode connection voltage source of D11, the anode of the emitter connection diode D11 of triode V9, the current collection of triode V9
Pole connects collector load resistor R14, and the other end of collector load resistor R14 connects voltage source resistance with load resistance R30
The end R8, voltage source resistance R8 connection voltage source E2, the other end of load resistance R30 and the anode of diode D11 and triode V9
Emitter connection；Switching circuit includes output end E3, output end E4, metal-oxide-semiconductor Q3 and switch RC mould group, the metal-oxide-semiconductor Q3 leakage
The other end and output end E4 of the source electrode connection switch RC mould group of pole mould group one end connection switch RC and output end E3, metal-oxide-semiconductor Q3,
The source electrode of metal-oxide-semiconductor Q3 is connect with the anode of diode D11, and the grid of metal-oxide-semiconductor Q3 passes through voltage source resistance R8 connection voltage source E2
End, the mould group both ends switch RC connection output end E3 and output end E4, switch RC mould group is by the resistance R34 and capacitor that are connected in series
C18 is composed 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 stablizes the waveform of output rectified voltage to meet the high-power output of Switching Power Supply.
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 terminals 1C, the voltage source of second group of switch protecting circuit
The end E2 is connect with terminals 5B, and the end voltage source E1 of second group of switch protecting circuit is connect with terminals 4B, and second group of switch is protected
The end voltage source E3 of protection circuit is connect with terminals 2D, 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 terminals 7B, the voltage source E2 of third group switch protecting circuit
End is connect with terminals 6B, and the end voltage source E3 of third group switch protecting circuit is connect with DC voltage input end, and third group is opened
The end voltage source E4 for closing protection circuit is connect with terminals 2D, the end voltage source E2 of the 4th group of switch protecting circuit and terminals 4A
Connection, the end voltage source E1 of the 4th group of switch protecting circuit are connect with terminals 5A, the voltage source of the 4th group of switch protecting circuit
The end E3 is connect with terminals 1C, and the end voltage source E4 of the 4th group of switch protecting circuit is connect with ground terminal AGND, the terminals
1C and terminals 2D is two terminals of load.
If the end voltage source E2 of first group of switch protecting circuit and second group of switch protecting circuit is high level, first group is opened
The end voltage source E1 for closing protection circuit and second group of switch protecting circuit is low level, third group switch protecting circuit and the 4th group
The end voltage source E2 of switch protecting circuit is low level, the voltage of third group switch protecting circuit and the 4th group of switch protecting circuit
The source end E1 is high level, and electricity is opened in the metal-oxide-semiconductor Q3 grid acquisition of first group of switch protecting circuit and second group of switch protecting circuit
The metal-oxide-semiconductor Q3 conducting of pressure, first group of switch protecting circuit and second group of switch protecting circuit, electric current successively pass through first group of switch
Protect circuit metal-oxide-semiconductor Q3, load and second group of switch protecting circuit metal-oxide-semiconductor Q3 after connect to be formed back with ground terminal AGND
Road, load 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
The end voltage source E1 of level, first group of switch protecting circuit and second group of switch protecting circuit is high level, and third group switch is protected
The end voltage source E2 of protection circuit and the 4th group of switch protecting circuit is high level, third group switch protecting circuit and the 4th group of switch
The end voltage source E1 for protecting circuit is low level, the metal-oxide-semiconductor Q3 of third group switch protecting circuit and the 4th group of switch protecting circuit
Grid obtains cut-in voltage, and the metal-oxide-semiconductor Q3 conducting of third group switch protecting circuit and the 4th group of switch protecting circuit, electric current is successively
By the metal-oxide-semiconductor Q3 of third group switch protecting circuit, load and the 4th group of switch protecting circuit metal-oxide-semiconductor Q3 after with ground terminal AGND
Connection forming circuit, primary coil T50 and primary coil T60 obtain backward voltage；Such first group of switch protecting circuit and
Two groups of switch protecting circuit work, third group switch protecting circuit and the 4th group of switch protecting circuit do not work, alternately and repeatedly work
Make, by the direct current output after rectification.
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 (1)
1. a kind of bridge switching circuit, it is characterised in that: the bridge switching circuit includes four groups of switch protecting circuits, described to open
Closing protection circuit includes protection circuit and switching circuit, protection circuit 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；Triode V9's
Base stage connects base resistance R26, and the other end of base resistance R26 connects the end E1 of voltage source, three poles with the cathode of diode D11
The anode of the emitter connection diode D11 of pipe V9, the collector of triode V9 connect collector load resistor R14, collector
The other end of load resistance R14 connects voltage source resistance R8 with load resistance R30, the end voltage source resistance R8 connection voltage source E2,
The other end of load resistance R30 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, described drain electrode mould group one end connection switch RC metal-oxide-semiconductor Q3 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 the anode of diode D11
Connection, the grid of metal-oxide-semiconductor Q3 pass through the end voltage source resistance R8 connection voltage source E2, the mould group both ends switch RC connection output end E3 with
Output end E4, switch RC mould group are composed in series by the resistance R34 and capacitor C18 being connected in series；First group of switch protecting circuit
The end voltage source 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
The end voltage source E3 of switch protecting circuit is connect with DC voltage input end, the end voltage source E4 of first group of switch protecting circuit with
Terminals 1C connection, the end voltage source E2 of second group of switch protecting circuit are connect with terminals 5B, second group of switch protecting circuit
The end voltage source E1 connect with terminals 4B, the end voltage source E3 of second group of switch protecting circuit is connect with terminals 2D, second
The end voltage source E4 of group switch protecting circuit is connect with ground terminal AGND；The end voltage source E1 of third group switch protecting circuit with connect
Line end 7B connection, the end voltage source E2 of third group switch protecting circuit are connect with terminals 6B, third group switch protecting circuit
The end voltage source E3 is connect with DC voltage input end, and the end voltage source E4 of third group switch protecting circuit is connect with terminals 2D,
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 terminals 1C, the 4th group of switch protecting circuit
The end voltage source E4 connect with ground terminal AGND, the terminals 1C and terminals 2D are two terminals of load.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822060895.4U CN209472567U (en) | 2018-12-07 | 2018-12-07 | A kind of bridge switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822060895.4U CN209472567U (en) | 2018-12-07 | 2018-12-07 | A kind of bridge switching circuit |
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| CN209472567U true CN209472567U (en) | 2019-10-08 |
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| CN201822060895.4U Active CN209472567U (en) | 2018-12-07 | 2018-12-07 | A kind of bridge switching circuit |
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| CN (1) | CN209472567U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794889A (en) * | 2019-10-29 | 2020-02-14 | 刘洋 | Temperature control system for slice dyeing reaction cabin |
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2018
- 2018-12-07 CN CN201822060895.4U patent/CN209472567U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794889A (en) * | 2019-10-29 | 2020-02-14 | 刘洋 | Temperature control system for slice dyeing reaction cabin |
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