CN203859699U - Over-current protection circuit of bridge arm power switching tube of full-bridge inverter - Google Patents
Over-current protection circuit of bridge arm power switching tube of full-bridge inverter Download PDFInfo
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- CN203859699U CN203859699U CN201320876393.3U CN201320876393U CN203859699U CN 203859699 U CN203859699 U CN 203859699U CN 201320876393 U CN201320876393 U CN 201320876393U CN 203859699 U CN203859699 U CN 203859699U
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Abstract
The utility model relates to a protection circuit, particularly to an over-current protection circuit of a bridge arm power switching tube of a full-bridge inverter. The over-current protection circuit consists of an A phase, a B phase, and a C phase of a three-phase power-frequency power supply, a three-phase rectifier bridge, a current transformer, four power tubes V1, V2, V3, and V4, a capacitor and inductor coupler, a rectifier filter, a hall current detector, a load resistor Rf, and an over-current detector. When a current over-loading or power supply short-circuit phenomenon occurs at the load resistor Rf, the output voltage of the over-current detector exceeds a normal value based on coupling of the hall current detector, the rectifier filter, the transformer, the capacitor and inductor coupler, the power tubes V1, V2, V3, and V4, and the current transformer, so that the voltage-stabilizing constant-current over-current protection control unit stops emitting square-wave pulse signals and thus the power tubes V1, V2, V3, and V4 are cut off instantaneously. Therefore, the power tubes are effectively protected. When the power supply is in a normal state again, the power tubes starts to work normally again.
Description
Technical field
The utility model relates to a kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit.
Background technology
In full-bridge inverting apparatus, high voltage and large electric current are made in the carrying of four brachium pontis power switch pipes, are the parts occurred frequently of machine failure, therefore to the current foldback circuit of four the brachium pontis power switch pipes particular importance that whether very effectively seems.
Normal its structural representation of method adopting 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 collector electrode of the emitter of described power tube V1 and 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 connected with the g2 end of the elementary g1 g2 winding of current transformer, the g1 end of the elementary g1 g2 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 g3 g4 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 output 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 sent into 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 sent into power tube V1, V2, V3, the control utmost point of V4.
The principle of the overload protection of Fig. 3 circuit is: when circuit is normally worked; voltage stabilization and current stabilization overcurrent protection control unit sends continuous cycle square-wave pulse signal to the control utmost point of power tube V1, V4, V2, V3; in upper half period; power tube V1V4 conducting V2V3 cut-off, and power tube V1V4 cut-off V2V3 conducting in lower half period.In upper half period, through the collector electrode of power tube V1,, one end of the emitter of V1, inductance capacitance coupling device is, an input of the other end of described inductance capacitance coupling device, transformer is, the g2 of the elementary g1 g2 winding of another input of transformer, current transformer holds, g1 end, the collector electrode of power tube V4, the emitter of V4 of the elementary g1 g2 winding of current transformer flow to three-phase commutation bridge output negative terminal to the electric current of three-phase commutation bridge output plus terminal; And in lower half period, the electric current of three-phase commutation bridge output plus terminal is exported negative terminal through the collector electrode of power tube V3, g2 end, an input of transformer, another input of transformer, the collector electrode of power tube V2, the emitter of V2 of the elementary g1 g2 winding of the g1 of the elementary g1 g2 winding of the emitter of V3, current transformer end, current transformer flow to three-phase commutation bridge.In one-period, two ends at the secondary g3 g4 winding of current transformer induce positive and negative two square-wave pulses, be transformed into a voltage signal through over-current detector, the electric current flowing through on the elementary g1 g2 winding of the size of the magnitude of voltage of this voltage signal and current transformer is corresponding.When the current overload on power supply output loading Rf or power supply short circuit, the electric current of power output end surpasses 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, finally make the output voltage of over-current detector surpass normal value, cause voltage stabilization and current stabilization overcurrent protection control unit to stop sender's wave pulse signal, make power tube V1, V4, V2, V3 moment ends, thereby effectively protected power tube, when power up normal condition, power tube recovers normal work.
But in real work; because of various reasons, for example, 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; cause power tube V1V2 or V3V4 with there is in a flash conducting, so-called " leading altogether " phenomenon occurs.And while there is " leading altogether "; because the electric current on load Rf does not increase; thereby the electric current of the elementary g1 g2 winding of current transformer do 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 the output positive voltage of three-phase commutation bridge by the collector electrode of power tube V1, the collector electrode of the emitter of V1, V2, the emitter of V2 directly flows to the output negative voltage of three-phase commutation bridge; due in loop without any load resistance; powerful electric current will flow through power tube V1, V2; therefore power tube V1, V2 will burn immediately, so the traditional protective circuit shown in Fig. 3 is incomplete.
Utility model content
In order to address the above problem, the utility model provides a kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit.
The utility model 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, the g1 end of the elementary g1 g2 winding of the output positive voltage of described three-phase commutation bridge and current transformer, the g3 end of the elementary g3 g4 winding of described current transformer is connected, and the g2 end of the elementary g1 g2 winding of described current transformer is connected with the collector electrode of power tube V1, the collector electrode of the emitter of described power tube V1 and 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 connected with the g4 end of the elementary g3 g4 winding of described current transformer, the output negative voltage of described three-phase commutation bridge and described power tube V2, the emitter of V4 is connected, the g5 g6 two ends of the secondary g5 g6 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, another output of described transformer and described power supply output 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 sent 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 is sent into power tube V1, V2, V3, the control utmost point of V4.
The principle of the utility model overload protection is: when circuit is normally worked; voltage stabilization and current stabilization overcurrent protection control unit sends continuous cycle square-wave pulse signal; in upper half period, power tube V1V4 conducting V2V3 cut-off, and power tube V1V4 cut-off V2V3 conducting in lower half period.In upper half period, the output positive voltage of three-phase commutation bridge is through the g1 of the elementary g1 g2 winding of current transformer end, the g2 end of the elementary g1 g2 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 through the g3 of the elementary g3 g4 winding of current transformer end, the g4 end of the elementary g3 g4 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 is normally worked, the secondary g5 g6 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 g1 g2 winding of current transformer of the output voltage values of over-current detector or the size of current of the elementary g3 g4 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, finally make the output voltage of over-current detector surpass normal value, cause voltage stabilization and current stabilization overcurrent protection control unit to stop sender's wave pulse signal, make power tube V1, V4, V2, V3 moment ends, thereby effectively protected power tube, when power up normal condition, power tube recovers normal work.
The utility model is in real work; because of various reasons, for example, 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; cause power tube V1V2 or V3V4 with all there is in a flash conducting, so-called " leading altogether " phenomenon occurs.There is " leading altogether " in power tube V1V2 for example, now the output positive voltage of three-phase commutation bridge is by the elementary g1 g2 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 large current signal is immediately by the elementary g1 g2 winding of current transformer, and then be coupled to the secondary g5 g6 winding of current transformer and through over-current detector, large 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 are turn-offed immediately, thereby effectively avoided the damage of the power switch pipe that causes due to " leading altogether ".As " leading altogether " occurs power tube V3V4, the protection process of its circuit protection process and power tube V1V2 generation " leading altogether " is similar, no longer repeated description.
A kind of preferred circuit connecting mode of the utility model is: described three-phase commutation bridge comprises six diode D11, D12, D13, D14, D15, D16, connects inductance L 1 on described three-phase commutation bridge, capacitor C 1, 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 the negative pole of described diode D11 and 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 negative pole of the other end of described capacitor C1 and 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 collector electrode of the emitter of described power tube V1 and 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 connected with the t2 end of the elementary t1 t2 winding of transformer, the t1 end of the elementary t1 t2 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 t3 t5 winding of described transformer is connected with the positive pole of diode D31, the t5 end of the secondary t3 t5 winding of described transformer is connected with the positive pole of diode D32, the centre cap t4 of the secondary t3 t5 winding of described transformer and power supply output 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 the output plus terminal of power supply, one end of hall current detector H is connected, one end of the other end of described hall current detector H and inductance L 3, the other end of described capacitor C4 is connected, the negative pole of the other end of described inductance L 3 and described diode D31, the negative pole of described diode D32 is connected, the g5 end of the secondary g5g6 winding of described current transformer and the positive pole of diode D21, the negative pole of diode D22 is connected, the g6 end of the secondary g5g6 winding of described current transformer and the positive pole of diode D23, the negative pole of diode D24 is connected, the negative pole of the negative pole of described diode D21 and described diode D23, one end of resistor R1, one end of capacitor C3 is connected, the anodal utmost point 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, one end of the other end of described resistor R1 and resistor R2, comparator in-phase input end is connected, and the other end of described resistor R2 is logically connected with described power supply, one end of the other end of described resistor R4 and 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 the output signal of described comparator and described hall current detector H, the output voltage signal of described power supply output plus terminal is sent 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 is sent into power tube V1, V2, V3, the control utmost point 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 g1 g2, armature winding g3 g4, secondary winding g5 g6 and magnetic core form, over-current detector is by diode D21, D22, D23, D24, capacitor C3, resistor R1, R2, R3, R4, additional supply Vcc and comparator form, 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 form, rectifier filter is by diode D31, D32, inductance L 3, capacitor C4 forms, hall current detector symbol represents with H, power supply output plus terminal with+number represent, power supply output negative terminal with-number represent, power source loads represents with Rf.
When circuit is normally worked, voltage stabilization and current stabilization overcurrent protection control unit sends continuous cycle square-wave pulse signal, in upper half period, and power tube V1V4 conducting V2V3 cut-off, and power tube V1V4 cut-off 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 of D15 negative pole output is through inductance L 1, the elementary g1 g2 winding of current transformer, the collector electrode of power tube V1, the emitter of power tube V1, capacitor C 2, 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 g3 g4 winding of current transformer, the collector electrode of power tube V3, the emitter of power tube V3, primary winding t1t2, inductance L 2, capacitor C 2, 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 is normally worked, the secondary g5 g6 winding two ends of current transformer are high-frequency ac square-wave signal, this square-wave signal access is by diode D21, D22, D23, the single-phase rectification bridge that D24 forms, diode D21, the positive voltage of D23 negative pole output is after capacitor C3 filtering, send into by R1, R2, the voltage divider that power logic ground forms, its partial pressure value is sent into the in-phase input end of comparator, by additional supply Vcc, R3, the voltage divider that R4 forms, its partial pressure value is sent into the inverting input of comparator, when power supply is normally worked, 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, large 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 g1 g2 winding of current transformer or g3 g4 winding current obviously become large, and the voltage of the secondary winding g5 g6 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 in-phase input end of comparator higher than the voltage of inverting input, the output voltage that finally makes comparator is high level, this signal is sent 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 moment ends, thereby has effectively protected power tube, and when power up normal condition, power tube recovers normal work.
When power tube V1V2 or V3V4 generation " leading altogether ", there is " leading altogether " in power tube V1V2 for example, now three phase worker power through diode D11, the D13 of rectifier bridge, the positive voltage of the positive pole of D15 output through inductance L 1, make electric current by elementary g1 g2 winding, the collector electrode of power tube V1, the emitter of V1, the collector electrode of power tube V2, the emitter of V2 of instrument transformer directly flow to diode D12, the D14 of three-phase commutation bridge, the positive pole of D16 flows to three phase worker power.Due in loop without any load resistance, power tube V1, V2 will flow through larger electric current, this large current signal is the elementary g1 g2 winding of current flowing instrument transformer immediately, and then be coupled to the secondary g5 g6 winding of current transformer, and the voltage of the secondary winding g5 g6 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 in-phase input end of comparator higher than the voltage of inverting input, the output voltage that finally makes comparator is high level, this signal is sent 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 moment ends, thereby effectively protected 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 pass through the elementary g3 g4 winding of instrument transformer, the collector electrode of power tube V3, the emitter of V3, the collector electrode of power tube V4, the direct flow direction of emitter of V4 directly flows to the diode D12 of 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 large current signal is the elementary g3 g4 winding of current flowing instrument transformer immediately, and then be coupled to the secondary g5 g6 winding of current transformer, and the voltage of the secondary winding g5 g6 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 in-phase input end of comparator higher than the voltage of inverting input, the output voltage that finally makes comparator is high level, this signal is sent 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 moment ends, thereby has effectively protected power tube.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of full-bridge inverter brachium pontis of the utility model power switch pipe current foldback circuit;
Fig. 2 is the structure chart of a kind of full-bridge inverter brachium pontis of the utility model 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, the g1 end of the elementary g1 g2 winding of the output positive voltage of three-phase commutation bridge 1 and current transformer 2, the g3 end of the elementary g3 g4 winding of current transformer 2 is connected, the g2 end of the elementary g1 g2 winding of current transformer 2 is connected with the collector electrode of power tube V1, the g1 end of the elementary g1 g2 winding of current transformer 2 is Same Name of Ends, the collector electrode of the emitter of power tube V1 and power tube V2 with the g4 end of the elementary g3 g4 winding of current transformer 2, 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 connected with the g4 end of the elementary g3 g4 winding of current transformer 2, the output negative voltage of three-phase commutation bridge 1 and power tube V2, the emitter of V4 is connected, the g5 g6 two ends of the secondary g5 g6 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, transformer 6 another outputs and power supply output 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 sent into 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 sent into power tube V1, V2, V3, the control utmost point 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 the negative pole of diode D11 and diode D13, the negative pole of diode D15, one end of inductance L 1 is connected, one end of the other end of inductance L 1 and 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, the g1 end of the elementary g1 g2 winding of current transformer 2 is Same Name of Ends with the g4 end of the elementary g3 g4 winding of current transformer 2, the negative pole of the other end of capacitor C1 and 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 collector electrode of the emitter of power tube V1 and 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 connected with the t2 end of the elementary t1 t2 winding of transformer 6, the t1 end of the elementary t1 t2 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 t3 t5 winding of transformer 6 is connected with the positive pole of diode D31, the t5 end of the secondary t3 t5 winding of transformer 6 is connected with the positive pole of diode D32, the centre cap t4 of the secondary t3 t5 winding of transformer 6 and power supply output 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 the output plus terminal of power supply, one end of hall current detector 5 is connected, one end of the other end of hall current detector 5 and inductance L 3, the other end of capacitor C4 is connected, the negative pole of the other end of inductance L 3 and diode D31, the negative pole of diode D32 is connected, the g5 end of 2 level g5g6 windings of current transformer and the positive pole of diode D21, the negative pole of diode D22 is connected, the g6 end of 2 level g5g6 windings of current transformer and the positive pole of diode D23, the negative pole of diode D24 is connected, the negative pole of the negative pole of diode D21 and diode D23, one end of resistor R1, one end of capacitor C3 is connected, the anodal utmost point 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, one end of the other end of resistor R1 and resistor R2, comparator in-phase input end is connected, the other end of resistor R2 is logically connected with power supply, one end of the other end of resistor R4 and 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 the output signal of comparator and hall current detector 5, the output voltage signal of power supply output plus terminal is sent into 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 sent into power tube V1, V2, V3, the control utmost point of V4.
Claims (2)
1. a full-bridge inverter brachium pontis power switch pipe current foldback circuit, is characterized in that comprising 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, the g1 end of the elementary g1 g2 winding of the output positive voltage of described three-phase commutation bridge and current transformer, the g3 end of the elementary g3 g4 winding of described current transformer is connected, the g2 end of the elementary g1 g2 winding of described current transformer is connected with the collector electrode of power tube V1, the g1 end of the elementary g1 g2 winding of described current transformer is Same Name of Ends, the collector electrode of the emitter of described power tube V1 and power tube V2 with the g4 end of the elementary g3 g4 winding of described current transformer, 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 connected with the g4 end of the elementary g3 g4 winding of described current transformer, the output negative voltage of described three-phase commutation bridge and described power tube V2, the emitter of V4 is connected, the g5 g6 two ends of the secondary g5 g6 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, another output of described transformer and described power supply output 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 sent 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 is sent into power tube V1, V2, V3, the control utmost point of V4.
2. a kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit according to claim 1, it is characterized in that: described three-phase commutation bridge comprises six diode D11, D12, D13, D14, D15, D16, on described three-phase commutation bridge, connect inductance L 1, capacitor C 1, 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 the negative pole of described diode D11 and diode D13, the negative pole of diode D15, one end of inductance L 1 is connected, 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 g1 end of the elementary g1 g2 winding of described current transformer is Same Name of Ends with the g4 end of the elementary g3 g4 winding of described current transformer, the negative pole of the other end of described capacitor C1 and 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 collector electrode of the emitter of described power tube V1 and 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 connected with the t2 end of the elementary t1 t2 winding of transformer, the t1 end of the elementary t1 t2 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 t3 t5 winding of described transformer is connected with the positive pole of diode D31, the t5 end of the secondary t3 t5 winding of described transformer is connected with the positive pole of diode D32, the centre cap t4 of the secondary t3 t5 winding of described transformer and power supply output 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 the output plus terminal of power supply, one end of hall current detector is connected, one end of the other end of described hall current detector and inductance L 3, the other end of described capacitor C4 is connected, the negative pole of the other end of described inductance L 3 and described diode D31, the negative pole of described diode D32 is connected, the g5 end of the secondary g5g6 winding of described current transformer and the positive pole of diode D21, the negative pole of diode D22 is connected, the g6 end of the secondary g5g6 winding of described current transformer and the positive pole of diode D23, the negative pole of diode D24 is connected, the negative pole of the negative pole of described diode D21 and described diode D23, one end of resistor R1, one end of capacitor C3 is connected, the anodal utmost point 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, one end of the other end of described resistor R1 and resistor R2, comparator in-phase input end is connected, the other end of described resistor R2 is logically connected with described power supply, one end of the other end of described resistor R4 and resistor R3, the inverting input of described comparator is connected, 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, the output voltage signal of described power supply output plus terminal is sent into voltage stabilization and current stabilization overcurrent protection control unit, the output signal of described voltage stabilization and current stabilization overcurrent protection control unit is sent into power tube V1, V2, V3, the control utmost point of V4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320876393.3U CN203859699U (en) | 2013-12-30 | 2013-12-30 | Over-current protection circuit of bridge arm power switching tube of full-bridge inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320876393.3U CN203859699U (en) | 2013-12-30 | 2013-12-30 | Over-current protection circuit of bridge arm power switching tube of full-bridge inverter |
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| CN203859699U true CN203859699U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320876393.3U Withdrawn - After Issue CN203859699U (en) | 2013-12-30 | 2013-12-30 | Over-current protection circuit of bridge arm power switching tube of full-bridge inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812374A (en) * | 2013-12-30 | 2014-05-21 | 扬州双鸿电子有限公司 | Current foldback circuit for bridge arm power switch tube of full bridge inverter |
| CN108092237A (en) * | 2018-02-01 | 2018-05-29 | 佛山市南海毅顺电器设备有限公司 | A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
-
2013
- 2013-12-30 CN CN201320876393.3U patent/CN203859699U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812374A (en) * | 2013-12-30 | 2014-05-21 | 扬州双鸿电子有限公司 | Current foldback circuit for bridge arm power switch tube of full bridge inverter |
| CN103812374B (en) * | 2013-12-30 | 2016-01-27 | 扬州双鸿电子有限公司 | A kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit |
| CN108092237A (en) * | 2018-02-01 | 2018-05-29 | 佛山市南海毅顺电器设备有限公司 | A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection 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 |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| WO2021004451A1 (en) * | 2019-07-09 | 2021-01-14 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
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