CN103812374B - A kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit - Google Patents
A kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit Download PDFInfo
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- CN103812374B CN103812374B CN201310738397.XA CN201310738397A CN103812374B CN 103812374 B CN103812374 B CN 103812374B CN 201310738397 A CN201310738397 A CN 201310738397A CN 103812374 B CN103812374 B CN 103812374B
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Abstract
A kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit; relate to a kind of protective circuit, type comprises the A phase of three phase worker power, B phase, C phase, three-phase commutation bridge, current transformer, four power tube V1, V2, V3, V4, capacitor and inductor coupler, rectifier filter, hall current detector, load resistance Rf, over-current detector.When the current overload on power supply output loading Rf or power supply short circuit; by the coupling of hall current detector, rectifier filter, transformer, inductance capacitance coupling device, power tube V1, V4, V2, V3, current transformer; the output voltage of over-current detector is finally made to exceed normal value; voltage stabilization and current stabilization overcurrent protection control unit is caused to stop sender's wave pulse signal; power tube V1, V4, V2, V3 are ended instantaneously; thus effectively protect power tube; when power up normal condition, power tube recovers normal work.
Description
Technical field
The present invention relates to a kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit.
Background technology
Whether, in full-bridge inverting apparatus, high voltage and big current are made in the carrying of four brachium pontis power switch pipes, are the parts occurred frequently of machine failure, therefore very effectively to seem particular importance to the current foldback circuit of four brachium pontis power switch pipes.
Normal its structural representation of method adopted as shown in Figure 3 at present, its circuit structure is: the A phase of three phase worker power, B phase, C phase is connected with three inputs of three-phase commutation bridge, the output positive voltage of three-phase commutation bridge and power tube V1, the collector electrode of V3 is connected, the output negative voltage of described three-phase commutation bridge and power tube V2, the emitter of V4 is connected, the emitter of described power tube V1 and the collector electrode of described power tube V2, one end of inductance capacitance coupling device is connected, the other end of described inductance capacitance coupling device is connected with an input of transformer, another input of described transformer is held with the g2 of the elementary g1g2 winding of current transformer and is connected, the g1 end of the elementary g1g2 winding of described current transformer and the emitter of described power tube V3, the collector electrode of described power tube V4 is connected, the g3 end of the secondary g3g4 winding of described current transformer is connected with two inputs of over-current detector with g4 end, two outputs of described transformer are connected with two inputs of rectifier filter, another output of described transformer and power supply export negative terminal, one end of load resistance Rf, logically being connected of described power supply, the output of described rectifier filter is connected with the input of hall current detector, the output of described hall current detector and power supply output plus terminal, the other end of described load resistance Rf is connected, the output signal of described over-current detector, the output signal of described hall current detector, the output voltage signal of described power supply output plus terminal is made a gift to someone the input of voltage stabilization and current stabilization overcurrent protection control unit, the output signal of described voltage stabilization and current stabilization overcurrent protection control unit is made a gift to someone power tube V1, V2, V3, the control pole of V4.
The principle of the overload protection of Fig. 3 circuit is: when circuit normally works; voltage stabilization and current stabilization overcurrent protection control unit sends continuous print cycle square wave pulse signal to the control pole of power tube V1, V4, V2, V3; in upper half period; power tube V1V4 conducting V2V3 ends, and power tube V1V4 ends V2V3 conducting in lower half period.In upper half period, the electric current of three-phase commutation bridge output plus terminal flows to three-phase commutation bridge output negative terminal through the emitter of the collector electrode of power tube V1, V1, one end of inductance capacitance coupling device, the other end of described inductance capacitance coupling device, an input of transformer, another input of transformer, the g2 end of the elementary g1g2 winding of current transformer, the g1 end of the elementary g1g2 winding of current transformer, the collector electrode of power tube V4, the emitter of V4; And in lower half period, the electric current of three-phase commutation bridge output plus terminal flows to three-phase commutation bridge output negative terminal through the collector electrode of power tube V3, the emitter of V3, the g1 end of the elementary g1g2 winding of current transformer, the g2 end of the elementary g1g2 winding of current transformer, an input of transformer, another input of transformer, the collector electrode of power tube V2, the emitter of V2.In one cycle, positive and negative two square-wave pulses are induced at the two ends of the secondary g3g4 winding of current transformer, be transformed into a voltage signal through over-current detector, the size of the magnitude of voltage of this voltage signal is corresponding with the electric current that the elementary g1g2 winding of current transformer flows through.When the current overload on power supply output loading Rf or power supply short circuit, the electric current of power output end exceedes normal value, pass through hall current detector, rectifier filter, transformer, inductance capacitance coupling device, power tube V1, V4, V2, V3, the coupling of current transformer, the output voltage of over-current detector is finally made to exceed normal value, voltage stabilization and current stabilization overcurrent protection control unit is caused to stop sender's wave pulse signal, make power tube V1, V4, V2, V3 ends instantaneously, thus effectively protect power tube, when power up normal condition, power tube recovers normal work.
But in real work; because of various reasons, such as, due to power network fluctuation or electromagnetic interference, make the function of voltage stabilization and current stabilization overcurrent protection control unit that the disorder of moment occur; causing power tube V1V2 or V3V4 with there is conducting in a flash, namely what is called occurring and " leads " phenomenon altogether.And when there is " leading altogether "; because the electric current on load Rf does not increase; thus the electric current of the elementary g1g2 winding of current transformer does not increase, that is the output voltage values of over-current detector still locates normal value, and voltage stabilization and current stabilization overcurrent protection control unit can not stop sending pulse.Now namely the output positive voltage of three-phase commutation bridge directly flows to the output negative voltage of three-phase commutation bridge by the collector electrode of power tube V1, the emitter of V1, the collector electrode of V2, the emitter of V2; due in loop without any load resistance; powerful electric current will flow through power tube V1, V2; therefore and immediately power tube V1, V2 will burn, and the traditional protective circuit therefore shown in Fig. 3 is incomplete.
Summary of the invention
In order to solve the problem, the invention provides a kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit.
The present invention includes the A phase of three phase worker power, B phase, C phase, three-phase commutation bridge, current transformer, four power tube V1, V2, V3, V4, capacitor and inductor coupler, rectifier filter, hall current detector, load resistance Rf, the A phase of three phase worker power, B phase, C phase is connected with three inputs of three-phase commutation bridge, and the g1 of the output positive voltage of described three-phase commutation bridge and the elementary g1g2 winding of current transformer holds, the g3 end of the elementary g3g4 winding of described current transformer is connected, and the g2 end of the elementary g1g2 winding of described current transformer is connected with the collector electrode of power tube V1, the emitter of described power tube V1 and the collector electrode of power tube V2, one end of inductance capacitance coupling device is connected, and the other end of described inductance capacitance coupling device is connected with an input of transformer, another input of described transformer and the emitter of power tube V3, the collector electrode of power tube V4 is connected, and the collector electrode of described power tube V3 is held with the g4 of the elementary g3g4 winding of described current transformer and is connected, the output negative voltage of described three-phase commutation bridge and described power tube V2, the emitter of V4 is connected, the g5g6 two ends of secondary g5g6 winding of described current transformer are connected with two inputs of over-current detector, two outputs of described transformer are connected with two inputs of rectification filtering unit, the output of described rectifier filter is connected with one end of hall current detector, the other end of described hall current detector and power supply output plus terminal, one end of load resistance Rf is connected, and another output of described transformer and described power supply export negative terminal, the other end of described load resistance Rf, logically being connected of described power supply, the output signal of described over-current detector, the output signal of described hall current detector, the output voltage signal of described power supply output plus terminal is made a gift to someone voltage stabilization and current stabilization overcurrent protection control unit, and the output signal of described voltage stabilization and current stabilization overcurrent protection control unit is made a gift to someone power tube V1, V2, V3, the control pole of V4.
The principle of overload protection of the present invention is: when circuit normally works; voltage stabilization and current stabilization overcurrent protection control unit sends continuous print cycle square wave pulse signal; in upper half period, power tube V1V4 conducting V2V3 ends, and power tube V1V4 ends V2V3 conducting in lower half period.In upper half period, the output positive voltage of three-phase commutation bridge is held through the g1 of the elementary g1g2 winding of current transformer, the g2 end of the elementary g1g2 winding of described current transformer, the collector electrode of power tube V1, the emitter of power tube V1, one end of inductance capacitance coupling device, the other end of described inductance capacitance coupling device, an input of transformer, another input of transformer, the collector electrode of power tube V4, the emitter of power tube V4 flows to the output negative terminal of three-phase commutation bridge, and in lower half period, the output positive voltage of described three-phase commutation bridge is held through the g3 of the elementary g3g4 winding of current transformer, the g4 end of the elementary g3g4 winding of described current transformer, the collector electrode of power tube V3, the emitter of power tube V3, an input of transformer, another input of transformer, one end of inductance capacitance coupling device, the other end of described inductance capacitance coupling device, the collector electrode of power tube V2, the emitter of power tube V2 flows to the output negative terminal of three-phase commutation bridge.
When circuit normally works, the secondary g5g6 winding two ends of current transformer are high-frequency ac square-wave signal, the input of this square-wave signal access over-current detector, the size reflection elementary g1g2 winding of current transformer of the output voltage values of over-current detector or the size of current of the elementary g3g4 winding of current transformer, when the current overload on power supply output loading Rf or power supply short circuit, pass through hall current detector, rectifier filter, transformer, inductance capacitance coupling device, power tube V1, V4, V2, V3, the coupling of current transformer, the output voltage of over-current detector is finally made to exceed normal value, voltage stabilization and current stabilization overcurrent protection control unit is caused to stop sender's wave pulse signal, make power tube V1, V4, V2, V3 ends instantaneously, thus effectively protect power tube, when power up normal condition, power tube recovers normal work.
The present invention is in real work; because of various reasons, such as, due to power network fluctuation or electromagnetic interference, make the function of voltage stabilization and current stabilization overcurrent protection control unit that the disorder of moment occur; causing power tube V1V2 or V3V4 with all there is conducting in a flash, namely what is called occurring and " leads " phenomenon altogether.Such as there is " leading altogether " in power tube V1V2, now the output positive voltage of three-phase commutation bridge is namely by the elementary g1g2 winding of current transformer, the collector electrode of power tube V1, the emitter of V1, the collector electrode of power tube V2, the emitter of V2 directly flows to the output negative voltage of three-phase commutation bridge, due in loop without any load resistance, power tube V1, V2 will flow through larger electric current, this big current signal is immediately by the elementary g1g2 winding of current transformer, and then be coupled to the secondary g5g6 winding of current transformer and through over-current detector, big current signal sent into voltage stabilization and current stabilization overcurrent protection control unit, voltage stabilization and current stabilization overcurrent protection control unit stops sending pulse immediately, power tube V1V2 or V3V4 is turned off immediately, thus effectively prevent the damage of the power switch pipe caused due to " leading altogether ".As " leading altogether " occurs power tube V3V4, the protection process that " leading altogether " occurs for its circuitry protection process and power tube V1V2 is similar, no longer repeated description.
A kind of preferred circuit connecting mode of the present invention is: described three-phase commutation bridge comprises six diode D11, D12, D13, D14, D15, D16, described three-phase commutation bridge connects inductance L 1, electric capacity C1, the A phase power supply of described three phase worker power and the positive pole of diode D11, the negative pole of D12 is connected, the B phase power supply of described three phase worker power and the positive pole of diode D13, the negative pole of D14 is connected, the C phase power supply of described three phase worker power and the positive pole of diode D15, the negative pole of D16 is connected, the negative pole of described diode D11 and the negative pole of diode D13, the negative pole of diode D15, one end of inductance L 1 is connected, and the other end of described inductance L 1 connects one end of capacitor C1 and holds with the g1 of the elementary g1g2 winding of described current transformer, the g3 end of the elementary g3g4 winding of described current transformer is connected, the other end of described capacitor C1 and the negative pole of diode D12, the negative pole of diode D14, the negative pole of diode D16, the emitter of power tube V2, the emitter of power tube V4 is connected, the g2 end of the elementary g1g2 winding of described current transformer is connected with the collector electrode of power tube V1, the g4 end of the elementary g3g4 winding of described current transformer is connected with the collector electrode of power tube V3, the emitter of described power tube V1 and the collector electrode of power tube V3, one end of capacitor C2 is connected, the other end of described capacitor C2 is connected with one end of inductance L 2, the other end of described inductance L 2 is held with the t2 of the elementary t1t2 winding of transformer and is connected, the t1 end of the elementary t1t2 winding of described transformer and the emitter of power tube V3, the collector electrode of power tube V4 is connected, the t3 end of the secondary t3t5 winding of described transformer is connected with the positive pole of diode D31, the t5 end of the secondary t3t5 winding of described transformer is connected with the positive pole of diode D32, and centre cap t4 and the power supply of the secondary t3t5 winding of described transformer export negative terminal, one end of capacitor C4, one end of load resistance Rf, be connected to power logic, the other end of described load resistance Rf and output plus terminal of power supply, one end of hall current detector H is connected, the other end of described hall current detector H and one end of inductance L 3, the other end of described capacitor C4 is connected, the other end of described inductance L 3 and the negative pole of described diode D31, the negative pole of described diode D32 is connected, the g5 end of described secondary transformer g5g6 winding and the positive pole of diode D21, the negative pole of diode D22 is connected, the g6 end of described secondary transformer g5g6 winding and the positive pole of diode D23, the negative pole of diode D24 is connected, the negative pole of described diode D21 and the negative pole of described diode D23, one end of resistor R1, one end of capacitor C3 is connected, the positive pole pole of described diode D22 and the positive pole of described diode D24, the other end of described capacitor C3, one end of resistor R4, logically being connected of described power supply, the other end of described resistor R1 and one end of resistor R2, comparator in-phase input end is connected, the other end of described resistor R2 and being logically connected of described power supply, the described other end of resistor R4 and one end of resistor R3, the inverting input of described comparator is connected, and the other end of described resistor R3 is connected with the additional supply Vcc of described power supply, the output signal of described comparator and the output signal of described hall current detector H, the output voltage signal of described power supply output plus terminal is made a gift to someone voltage stabilization and current stabilization overcurrent protection control unit, and the output signal of described voltage stabilization and current stabilization overcurrent protection control unit is made a gift to someone power tube V1, V2, V3, the control pole of V4.
This preferred circuit operation principle is: three-phase commutation bridge is by diode D11, D12, D13, D14, D15, D16, inductance L 1, capacitor C1 forms, current transformer is by armature winding g1g2, armature winding g3g4, secondary winding g5g6 and magnetic core composition, over-current detector is by diode D21, D22, D23, D24, capacitor C3, resistor R1, R2, R3, R4, additional supply Vcc and comparator composition, power tube V1, V2 forms the first brachium pontis of full-bridge inverter, power tube V3, V4 forms the second brachium pontis of full-bridge inverter, inductance capacitance coupling device is by capacitor C2, inductance L 2 forms, transformer is by armature winding t1t2, secondary winding t3t5, the centre cap t4 of secondary winding and iron core composition, rectifier filter is by diode D31, D32, inductance L 3, capacitor C4 forms, hall current detector symbol H represents, power supply output plus terminal with+number to represent, power supply export negative terminal with-number to represent, power source loads Rf represents.
When circuit normally works, voltage stabilization and current stabilization overcurrent protection control unit sends continuous print cycle square wave pulse signal, and in upper half period, power tube V1V4 conducting V2V3 ends, and power tube V1V4 ends V2V3 conducting in lower half period.In upper half period, three phase worker power is through the diode D11 of rectifier bridge, D13, the positive voltage that D15 negative pole exports is through inductance L 1, the elementary g1g2 winding of current transformer, the collector electrode of power tube V1, the emitter of power tube V1, electric capacity C2, inductance L 2, primary winding t1t2, the collector electrode of power tube V4, the emitter of power tube V4 flows to the diode D12 of three-phase commutation bridge, D14, the positive pole of D16 and flow to three phase worker power, and in lower half period, three phase worker power is through the diode D11 of rectifier bridge, D13, the positive voltage of the positive pole output of D15 is through inductance L 1, the elementary g3g4 winding of current transformer, the collector electrode of power tube V3, the emitter of power tube V3, primary winding t1t2, inductance L 2, electric capacity C2, the collector electrode of power tube V2, the emitter of power tube V2 flows to the diode D12 of three-phase commutation bridge, D14, the positive pole of D15 and flow to three phase worker power.
When circuit normally works, the secondary g5g6 winding two ends of current transformer are high-frequency ac square-wave signal, the access of this square-wave signal is by diode D21, D22, D23, the single-phase rectification bridge of D24 composition, diode D21, the positive voltage that D23 negative pole exports is after capacitor C3 filtering, send into by R1, R2, the voltage divider of power logic ground composition, its partial pressure value sends into the in-phase input end of comparator, by additional supply Vcc, R3, the voltage divider of R4 composition, its partial pressure value sends into the inverting input of comparator, when power supply normally works, the voltage of the in-phase input end of comparator is lower than the voltage of reverse input end, the output voltage of comparator is low level.
The principle of its overload protection is: when the current overload on power supply output loading Rf or power supply short circuit, and big current signal is by hall current detector H, inductance L 3, diode D31, D32, the secondary winding of transformer, the armature winding of transformer, inductance L 2, capacitor C2, power tube V1, V2, V3, the coupling of V4, makes the elementary g1g2 winding of current transformer or g3g4 winding current obviously become large, and the voltage of the secondary winding g5g6 winding of current transformer is obviously uprised, and through diode D21, D22, D23, the rectification of D24, the filtering of capacitor C3, resistor R1, the dividing potential drop of R2 makes the voltage of voltage higher than inverting input of the in-phase input end of comparator, the output voltage of comparator is finally made to be high level, this signal sends into the input of voltage stabilization and current stabilization overcurrent protection control unit, cause voltage stabilization and current stabilization overcurrent protection control unit to stop sender's wave pulse signal, make power tube V1, V4, V2, V3 ends instantaneously, thus effectively protects power tube, and when power up normal condition, power tube recovers normal work.
When there is " leading altogether " in power tube V1V2 or V3V4, such as there is " leading altogether " in power tube V1V2, now the positive voltage that exports through the positive pole of diode D11, D13, D15 of rectifier bridge of three phase worker power is through inductance L 1, makes electric current directly be flowed to the positive pole of diode D12, D14, D16 of three-phase commutation bridge by the elementary g1g2 winding of instrument transformer, the collector electrode of power tube V1, the emitter of V1, the collector electrode of power tube V2, the emitter of V2 and be flowed to three phase worker power.Due in loop without any load resistance, power tube V1, V2 will flow through larger electric current, this big current signal flows through the elementary g1g2 winding of current transformer immediately, and then be coupled to the secondary g5g6 winding of current transformer, and the voltage of the secondary winding g5g6 winding of current transformer is obviously uprised, and through diode D21, D22, D23, the rectification of D24, the filtering of capacitor C3, resistor R1, the dividing potential drop of R2 makes the voltage of voltage higher than inverting input of the in-phase input end of comparator, the output voltage of comparator is finally made to be high level, this signal sends into the input of voltage stabilization and current stabilization overcurrent protection control unit, voltage stabilization and current stabilization overcurrent protection control unit is caused to stop sender's wave pulse signal, make power tube V1, V4, V2, V3 ends instantaneously, thus effectively protect power tube.And when " leading altogether " occurs power tube V3V4, now three phase worker power is through the diode D11 of rectifier bridge, D13, the positive voltage of the positive pole output of D15, through inductance L 1, makes electric current by the elementary g3g4 winding of instrument transformer, the collector electrode of power tube V3, the emitter of V3, the collector electrode of power tube V4, the emitter of V4 directly flows to the diode D12 directly flowing to three-phase commutation bridge, D14, the positive pole of D16 and flow to three phase worker power, due in loop without any load resistance, power tube V3, V4 will flow through larger electric current, this big current signal flows through the elementary g3g4 winding of current transformer immediately, and then be coupled to the secondary g5g6 winding of current transformer, and the voltage of the secondary winding g5g6 winding of current transformer is obviously uprised, and through diode D21, D22, D23, the rectification of D24, the filtering of capacitor C3, resistor R1, the dividing potential drop of R2 makes the voltage of voltage higher than inverting input of the in-phase input end of comparator, the output voltage of comparator is finally made to be high level, this signal sends into the input of voltage stabilization and current stabilization overcurrent protection control unit, cause voltage stabilization and current stabilization overcurrent protection control unit to stop sender's wave pulse signal, make power tube V1, V4, V2, V3 ends instantaneously, thus effectively protects power tube.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of full-bridge inverter brachium pontis of the present invention power switch pipe current foldback circuit;
Fig. 2 is the structure chart of a kind of full-bridge inverter brachium pontis of the present invention power switch pipe current foldback circuit;
Fig. 3 is the structure chart of conventional full bridge inverter leg power switch pipe current foldback circuit.
Embodiment
As shown in Figure 2, this full-bridge inverter brachium pontis power switch pipe current foldback circuit, comprises the A phase of three phase worker power, B phase, C phase, three-phase commutation bridge 1, current transformer 2, four power tube V1, V2, V3, V4, capacitor and inductor coupler 3, rectifier filter 4, hall current detector 5, over-current detector 7, transformer 6, voltage stabilization and current stabilization overcurrent protection control unit 8, load resistance Rf, the A phase of three phase worker power, B phase, C phase is connected with three inputs of three-phase commutation bridge 1, and the g1 of the output positive voltage of three-phase commutation bridge 1 and the elementary g1g2 winding of current transformer 2 holds, the g3 end of the elementary g3g4 winding of current transformer 2 is connected, the g2 end of the elementary g1g2 winding of current transformer 2 is connected with the collector electrode of power tube V1, g1 end and the g4 of the elementary g3g4 winding of current transformer 2 of the elementary g1g2 winding of current transformer 2 hold as Same Name of Ends, the emitter of power tube V1 and the collector electrode of power tube V2, one end of inductance capacitance coupling device 3 is connected, and the other end of inductance capacitance coupling device 3 is connected with an input of transformer 6, another input of transformer 6 and the emitter of power tube V3, the collector electrode of power tube V4 is connected, and the collector electrode of power tube V3 is held with the g4 of the elementary g3g4 winding of current transformer 2 and is connected, the output negative voltage of three-phase commutation bridge 1 and power tube V2, the emitter of V4 is connected, the g5g6 two ends of secondary g5g6 winding of current transformer 2 are connected with two inputs of over-current detector 7, two outputs of transformer 6 are connected with two inputs of rectification filtering unit, the output of rectifier filter 4 is connected with one end of hall current detector 5, the other end of hall current detector 5 and power supply output plus terminal, one end of load resistance Rf is connected, another output of transformer 6 and power supply export negative terminal, the other end of load resistance Rf, logically being connected of power supply, the output signal of over-current detector 7, the output signal of hall current detector 5, the output voltage signal of power supply output plus terminal is made a gift to someone voltage stabilization and current stabilization overcurrent protection control unit 8, the output signal of voltage stabilization and current stabilization overcurrent protection control unit 8 is made a gift to someone power tube V1, V2, V3, the control pole of V4.
As shown in Figure 1, the A phase power supply of three phase worker power of this full-bridge inverter brachium pontis power switch pipe current foldback circuit and the positive pole of the diode D11 of three-phase commutation bridge 1, the negative pole of D12 is connected, the positive pole of the B phase power supply of three phase worker power and the diode D13 of three-phase commutation bridge 1, the negative pole of D14 is connected, the positive pole of the C phase power supply of three phase worker power and the diode D15 of described three-phase commutation bridge 1, the negative pole of D16 is connected, the negative pole of diode D11 and the negative pole of diode D13, the negative pole of diode D15, one end of inductance L 1 is connected, the other end of inductance L 1 and one end of capacitor C1, the g1 end of the elementary g1g2 winding of current transformer 2, the g3 end of the elementary g3g4 winding of current transformer 2 is connected, g1 end and the g4 of the elementary g3g4 winding of current transformer 2 of the elementary g1g2 winding of current transformer 2 hold as Same Name of Ends, the other end of capacitor C1 and the negative pole of diode D12, the negative pole of diode D14, the negative pole of diode D16, the emitter of power tube V2, the emitter of power tube V4 is connected, the g2 end of the elementary g1g2 winding of current transformer 2 is connected with the collector electrode of power tube V1, the g4 end of the elementary g3g4 winding of current transformer 2 is connected with the collector electrode of power tube V3, the emitter of power tube V1 and the collector electrode of power tube V3, one end of capacitor C2 is connected, the other end of capacitor C2 is connected with one end of inductance L 2, the other end of inductance L 2 is held with the t2 of the elementary t1t2 winding of transformer 6 and is connected, the t1 end of the elementary t1t2 winding of transformer 6 and the emitter of power tube V3, the collector electrode of power tube V4 is connected, the t3 end of the secondary t3t5 winding of transformer 6 is connected with the positive pole of diode D31, the t5 end of the secondary t3t5 winding of transformer 6 is connected with the positive pole of diode D32, centre cap t4 and the power supply of the secondary t3t5 winding of transformer 6 export negative terminal, one end of capacitor C4, one end of load resistance Rf, be connected to power logic, the other end of load resistance Rf and output plus terminal of power supply, one end of hall current detector 5 is connected, the other end of hall current detector 5 and one end of inductance L 3, the other end of capacitor C4 is connected, the other end of inductance L 3 and the negative pole of diode D31, the negative pole of diode D32 is connected, the g5 end of current transformer 2 level g5g6 windings and the positive pole of diode D21, the negative pole of diode D22 is connected, the g6 end of current transformer 2 level g5g6 windings and the positive pole of diode D23, the negative pole of diode D24 is connected, the negative pole of diode D21 and the negative pole of diode D23, one end of resistor R1, one end of capacitor C3 is connected, the positive pole pole of diode D22 and the positive pole of described diode D24, the other end of capacitor C3, one end of resistor R4, logically being connected of power supply, the other end of resistor R1 and one end of resistor R2, comparator in-phase input end is connected, the other end of resistor R2 and being logically connected of power supply, the other end of resistor R4 and one end of resistor R3, the inverting input of comparator is connected, the other end of resistor R3 is connected with the additional supply Vcc of power supply, the output signal of comparator and the output signal of hall current detector 5, the output voltage signal of power supply output plus terminal is made a gift to someone voltage stabilization and current stabilization overcurrent protection control unit 8, the output signal of voltage stabilization and current stabilization overcurrent protection control unit 8 is made a gift to someone power tube V1, V2, V3, the control pole of V4.
Claims (1)
1. a full-bridge inverter brachium pontis power switch pipe current foldback circuit, comprises the A phase of three phase worker power, B phase, C phase, three-phase commutation bridge, current transformer, four power tube V1, V2, V3, V4, capacitor and inductor coupler, rectifier filter, hall current detector, load resistance Rf, the A phase of three phase worker power, B phase, C phase is connected with three inputs of three-phase commutation bridge, and the g1 of the output positive voltage of described three-phase commutation bridge and the elementary g1g2 winding of current transformer holds, the g3 end of the elementary g3g4 winding of described current transformer is connected, the g2 end of the elementary g1g2 winding of described current transformer is connected with the collector electrode of power tube V1, g1 end and the g4 of the elementary g3g4 winding of described current transformer of the elementary g1g2 winding of described current transformer hold as Same Name of Ends, the emitter of described power tube V1 and the collector electrode of power tube V2, one end of inductance capacitance coupling device is connected, and the other end of described inductance capacitance coupling device is connected with an input of transformer, another input of described transformer and the emitter of power tube V3, the collector electrode of power tube V4 is connected, and the collector electrode of described power tube V3 is held with the g4 of the elementary g3g4 winding of described current transformer and is connected, the output negative voltage of described three-phase commutation bridge and described power tube V2, the emitter of V4 is connected, the g5g6 two ends of secondary g5g6 winding of described current transformer are connected with two inputs of over-current detector, two outputs of described transformer are connected with two inputs of rectifier filter, the output of described rectifier filter is connected with one end of hall current detector, the other end of described hall current detector and power supply output plus terminal, one end of load resistance Rf is connected, and another output of described transformer and power supply export negative terminal, the other end of described load resistance Rf, logically being connected of power supply, the output signal of described over-current detector, the output signal of described hall current detector, the output voltage signal of described power supply output plus terminal sends into voltage stabilization and current stabilization overcurrent protection control unit, and the output signal of described voltage stabilization and current stabilization overcurrent protection control unit sends into power tube V1, V2, V3, the control pole of V4, it is characterized in that: described three-phase commutation bridge comprises six diode D11, D12, D13, D14, D15, D16, described three-phase commutation bridge connects inductance L 1, electric capacity C1, the A phase power supply of described three phase worker power and the positive pole of diode D11, the negative pole of D12 is connected, the B phase power supply of described three phase worker power and the positive pole of diode D13, the negative pole of D14 is connected, the C phase power supply of described three phase worker power and the positive pole of diode D15, the negative pole of D16 is connected, the negative pole of described diode D11 and the negative pole of diode D13, the negative pole of diode D15, one end of inductance L 1 is connected, and the other end of described inductance L 1 connects one end of capacitor C1 and holds with the g1 of the elementary g1g2 winding of described current transformer, the g3 end of the elementary g3g4 winding of described current transformer is connected, and g1 end and the g4 of the elementary g3g4 winding of described current transformer of the elementary g1g2 winding of described current transformer hold as Same Name of Ends, the other end of described capacitor C1 and the positive pole of diode D12, the positive pole of diode D14, the positive pole of diode D16, the emitter of power tube V2, the emitter of power tube V4 is connected, the g2 end of the elementary g1g2 winding of described current transformer is connected with the collector electrode of power tube V1, the g4 end of the elementary g3g4 winding of described current transformer is connected with the collector electrode of power tube V3, the emitter of described power tube V1 and the collector electrode of power tube V2, one end of capacitor C2 is connected, the other end of described capacitor C2 is connected with one end of inductance L 2, the other end of described inductance L 2 is held with the t2 of the elementary t1t2 winding of transformer and is connected, the t1 end of the elementary t1t2 winding of described transformer and the emitter of power tube V3, the collector electrode of power tube V4 is connected, the t3 end of the secondary t3t5 winding of described transformer is connected with the positive pole of diode D31, the t5 end of the secondary t3t5 winding of described transformer is connected with the positive pole of diode D32, and centre cap t4 and the power supply of the secondary t3t5 winding of described transformer export negative terminal, one end of capacitor C4, the other end of load resistance Rf, be connected to power logic, one end of described load resistance Rf is connected with output plus terminal of power supply, one end of described hall current detector and one end of inductance L 3, the other end of described capacitor C4 is connected, the other end of described inductance L 3 and the negative pole of described diode D31, the negative pole of described diode D32 is connected, the g5 end of described secondary transformer g5g6 winding and the positive pole of diode D21, the negative pole of diode D22 is connected, the g6 end of described secondary transformer g5g6 winding and the positive pole of diode D23, the negative pole of diode D24 is connected, the negative pole of described diode D21 and the negative pole of described diode D23, one end of resistor R1, one end of capacitor C3 is connected, the positive pole pole of described diode D22 and the positive pole of described diode D24, the other end of described capacitor C3, one end of resistor R4, logically being connected of described power supply, the other end of described resistor R1 and one end of resistor R2, comparator in-phase input end is connected, the other end of described resistor R2 and being logically connected of described power supply, the described other end of resistor R4 and one end of resistor R3, the inverting input of described comparator is connected, and the other end of described resistor R3 is connected with additional supply Vcc, the output signal of described comparator and the output signal of described hall current detector, the output voltage signal of described power supply output plus terminal sends into voltage stabilization and current stabilization overcurrent protection control unit, and the output signal of described voltage stabilization and current stabilization overcurrent protection control unit sends into power tube V1, V2, V3, the control pole of V4.
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| CN107453614A (en) * | 2017-09-15 | 2017-12-08 | 肇庆市锐高电子有限公司 | Full-bridge synchronous rectification circuit |
| CN108092237B (en) * | 2018-02-01 | 2023-09-26 | 佛山市南海毅顺电器设备有限公司 | Full-bridge inversion power switching tube overcurrent and load overcurrent protection circuit |
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| CN2596644Y (en) * | 2003-01-08 | 2003-12-31 | 北京日佳电源有限公司 | IGBT over current protective circuit |
| CN201841343U (en) * | 2010-10-28 | 2011-05-25 | 上海沪通企业集团有限公司 | Manual arc welding machine |
| CN102148494A (en) * | 2010-02-10 | 2011-08-10 | 艾默生网络能源***北美公司 | Bridge arm conduction protection circuit and rectification circuit |
| CN203859699U (en) * | 2013-12-30 | 2014-10-01 | 扬州双鸿电子有限公司 | Over-current protection circuit of bridge arm power switching tube of full-bridge inverter |
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| DE60210217T2 (en) * | 2001-01-31 | 2006-11-16 | Matsushita Electric Industrial Co., Ltd., Kadoma | SMPS device |
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| CN2596644Y (en) * | 2003-01-08 | 2003-12-31 | 北京日佳电源有限公司 | IGBT over current protective circuit |
| CN102148494A (en) * | 2010-02-10 | 2011-08-10 | 艾默生网络能源***北美公司 | Bridge arm conduction protection circuit and rectification circuit |
| CN201841343U (en) * | 2010-10-28 | 2011-05-25 | 上海沪通企业集团有限公司 | Manual arc welding machine |
| CN203859699U (en) * | 2013-12-30 | 2014-10-01 | 扬州双鸿电子有限公司 | Over-current protection circuit of bridge arm power switching tube of full-bridge inverter |
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