CN102969918A - Three-phase bridge-type inverter system and urgency lower short-circuit protective circuit - Google Patents
Three-phase bridge-type inverter system and urgency lower short-circuit protective circuit Download PDFInfo
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- CN102969918A CN102969918A CN2012104395186A CN201210439518A CN102969918A CN 102969918 A CN102969918 A CN 102969918A CN 2012104395186 A CN2012104395186 A CN 2012104395186A CN 201210439518 A CN201210439518 A CN 201210439518A CN 102969918 A CN102969918 A CN 102969918A
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Abstract
The invention discloses a three-phase bridge-type inverter system which adopts a mode that a detection switch type direct current/direct current (DC/DC) depressurization isolation changing circuit assistant side coil outputs alternating current signals and achieves monitoring of direct current voltage signals after rectification. A contravariant controller automatically controls a three-phase bridge-type inverter to enter an urgency lower short-circuit mode according to the alternating current signals output by the switch type DC/DC depressurization isolation changing circuit assistant side coil. The three-phase bridge-type inverter system is that the switch type DC/DC depressurization isolation changing circuit assistant side coil samples to detect abnormal power supply, the three-phase bridge-type inverter system is not influenced by a rectifying circuit, the three-phase bridge-type inverter can respond to the abnormal power supply in a short time to enter the urgency lower short-circuit mode, and burning damage to high voltage capacitors and power switches in the three-phase bridge-type inverter can be effectively avoided. The invention further discloses an urgency lower short-circuit protective circuit.
Description
Technical field
The present invention relates to a kind of power technology, particularly a kind of three-phase bridge type converter system and urgent lower short-circuit protection circuit.
Background technology
Be applied in the EV(pure electric automobile) and the HEV(hybrid vehicle) in inverter system, high-tension battery comes drive motors by three-phase bridge type converter (Inverter), realizes the control to three phase alternating current motor.
The three-phase bridge type converter system comprises high-tension battery, switching mode DC/DC(DC-to-DC) isolated variable circuit, inverter controller, three-phase bridge type converter;
Three-phase bridge type converter, as shown in Figure 1, three brachium pontis are arranged, each brachium pontis comprises the mutually upper brachium pontis power switch of serial connection, lower brachium pontis power switch, the up and down two ends of each brachium pontis connect respectively the positive and negative two ends of high-tension battery, three outputs of three-phase bridge type converter lay respectively at brachium pontis power switch on each brachium pontis of each brachium pontis, the tie point of lower brachium pontis power switch, control the open-minded of each power switch of brachium pontis by inverter controller, the shutoff order just can be exported one group of amplitude and equate between three outputs of three-phase bridge type converter, frequency equates, the three-phase electricity signal that the phase phasic difference is 120 °.
Power switch bypass in each brachium pontis is often distinguished a fly-wheel diode in parallel, in order to play the afterflow effect when bridge-type inverter output connects inductive load.
Power switch can be power transistor (GTR), gate level turn-off thyristor (GTO), power field effect pipe (PowerMOSFET), igbt (IGBT), integrated gate commutated thyristor (IGCT), SGCT (SGCT) etc.; Adopt IGBT as the power switch in the brachium pontis among Fig. 1, the collector electrode of each IGBT in the brachium pontis and an emitter two ends difference fly-wheel diode in parallel.
Described switching mode DC/DC step-down isolated variable circuit as shown in Figure 2, comprises isolating transformer, rectification circuit;
The primary coil of described isolating transformer is used for connecing high direct voltage VDD_IN, high direct voltage VDD_IN is normally greater than the direct voltage of the inversion operating voltage VDD_P of described rectification circuit output, for example high direct voltage VDD_IN is 30V, and inversion operating voltage VDD_P is 15V.In electric automobile, high direct voltage VDD_IN derives from the PEU(Power Electronic Unit of electric automobile, electric power electronic module usually) in power management chip or DC/DC module.
The secondary coil of the described isolating transformer of input termination of described rectification circuit;
Described rectification circuit output inversion operating voltage VDD_P is to described inverter controller, as the operating voltage of inverter controller.
In the time of can't providing normal working voltage to inverter controller in described switching mode DC/DC step-down isolated variable circuit because failure and other reasons, the power switch that inverter controller will be controlled in each brachium pontis of three-phase bridge type converter all turn-offs, only be connected in parallel on the other fly-wheel diode conducting of power switch in the brachium pontis, as shown in Figure 1.This moment, three phase alternating current motor worked in coast (freewheeling) pattern.Under this pattern, the three phase alternating current motor rotation will produce inverse electromotive force, electric energy flows to the dc bus side of three-phase bridge type converter from motor, and when rotating speed was higher, the high pressure of inverse electromotive force may make high-voltage capacitance and the power switch overvoltage in the three-phase bridge type converter burn.
For fear of above-mentioned situation, need to the supply power voltage of inverter controller be detected, and when the supply power voltage that detects inverter controller is unusual, provide critical activity power supply ASCVDD by high-tension battery to inverter controller immediately, and short circuit (ASC) pattern under entering promptly by inverter controller control three-phase bridge type converter, the upper brachium pontis power switch that is about to each brachium pontis in the three-phase bridge type converter all turn-offs, and lower brachium pontis power switch is all open-minded.This moment, circuit formed the loop by two lower brachium pontis power switchs and a diode, and power consumption is in the winding of the inside of motor, as shown in Figure 3.
A kind of inverter controller supply power voltage monitoring method commonly used, to judge by the amplitude of inversion operating voltage VDD_P that a supply power voltage testing circuit detects the rectification circuit output of described switching mode DC/DC step-down isolated variable circuit whether the supply power voltage of inverter controller is unusual, as shown in Figure 4.Yet, because the existence of the rectifying and wave-filtering electric capacity in the rectification circuit, the discharge time constant of circuit is larger, the supply power voltage testing circuit needs the long time (tens milliseconds are arranged approximately) to make response to abnormal electrical power supply, described switching mode DC/DC step-down isolated variable circuit this means when can not normally provide operating voltage for inverter controller, three-phase bridge type converter will be in runaway condition all the time within a few tens of milliseconds, have the very large risk of burning.
Summary of the invention
The technical problem to be solved in the present invention is to make three-phase bridge type converter respond abnormal electrical power supply within very short time, enters urgent lower short-circuit mode, effectively avoids high-voltage capacitance and power switch in the three-phase bridge type converter to be burnt.
For solving the problems of the technologies described above, three-phase bridge type converter provided by the invention system, it comprises high-tension battery, switching mode DC/DC isolated variable circuit, inverter controller, three-phase bridge type converter, promptly descends short-circuit protection circuit;
Three-phase bridge type converter, three brachium pontis are arranged, each brachium pontis comprises mutually upper brachium pontis power switch, two power switchs of lower brachium pontis power switch of serial connection, the up and down two ends of each brachium pontis connect respectively the positive and negative two ends of described high-tension battery, and three outputs of three-phase bridge type converter lay respectively at the tie point of brachium pontis power switch on each brachium pontis, lower brachium pontis power switch;
The other respectively fly-wheel diode in parallel of each power switch in the brachium pontis;
Described inverter controller is used for controlling the opening, turn-off of each power switch of three brachium pontis of described three-phase bridge type converter;
Described switching mode DC/DC step-down isolated variable circuit comprises isolating transformer, rectification circuit;
The primary coil of described isolating transformer is used for connecing high direct voltage;
The secondary coil of described isolating transformer connects the input of described rectification circuit;
Described rectification circuit output inversion operating voltage is to described inverter controller;
Described urgent lower short-circuit protection circuit comprises supply power voltage testing circuit, emergency service circuit;
Described supply power voltage testing circuit, the secondary coil of the described switching mode DC/DC step-down of input termination isolated variable circuit is used for judging according to the output AC signal of secondary coil whether the supply power voltage of described switching mode DC/DC step-down isolated variable circuit is unusual;
When supply power voltage was unusual, described supply power voltage testing circuit output power supply state signal was true, and when supply power voltage was normal, described supply power voltage testing circuit output power supply state signal was false;
Described emergency service circuit when the power supply state signal is true time, carries out voltage transformation to described high-tension battery, and output critical activity voltage when the power supply state signal is fictitious time, stops to export critical activity voltage to described inverter controller to described inverter controller;
Described inverter controller, when the power supply state signal is true time, take described critical activity voltage as operating voltage, and the output protection control signal controls three of described three-phase bridge type converter upper brachium pontis power switchs and turn-offs, and three lower brachium pontis power switchs are open-minded; When the power supply state signal is fictitious time, take the inversion operating voltage of the rectification circuit output of described switching mode DC/DC step-down isolated variable circuit as operating voltage, and output services control signal control three-phase bridge type converter output three-phase electricity signal.
Better, described high direct voltage derives from power management chip or the DC/DC module of electric automobile; Described high direct voltage is higher than described inversion operating voltage, and less than high-tension battery voltage.
Better, described inverter controller has normal power consumption mode, two kinds of mode of operations of low-power consumption mode, and the power consumption of inverter controller under low-power consumption mode is less than the power consumption under normal power consumption mode;
Be true time at described power supply state signal, described inverter controller works in low-power consumption mode.
Better, the power switch in the brachium pontis is igbt, the collector electrode of each igbt in the brachium pontis and an emitter two ends difference fly-wheel diode in parallel.
For solving the problems of the technologies described above, the present invention also provides is applied to urgent lower short-circuit protection circuit in the above-mentioned three-phase bridge type converter system, promptly descend short-circuit protection circuit to comprise that the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first diode, the second diode, the 3rd diode, the 4th voltage stabilizing didoe, the first electric capacity, the second electric capacity, the 3rd electric capacity, NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS manage, the 4th transistor;
Described the first resistance, the second diode are used for being serially connected between the grid of secondary coil with a described NMOS pipe of switching mode DC/DC step-down isolated variable circuit, and the negative terminal of the second diode is in the gate electrode side of a NMOS pipe;
Described the second resistance, the first diode are used for being serially connected between the grid of secondary coil with a described NMOS pipe of switching mode DC/DC step-down isolated variable circuit, and the anode of the first diode is in the gate electrode side of a NMOS pipe;
The resistance of described the second resistance is greater than the resistance of the first resistance;
Described the first electric capacity is connected on the grid of a NMOS pipe with between the ground;
Described the 3rd resistance is connected between the negative terminal of drain electrode with described the 3rd diode of a described NMOS pipe;
The source ground of a described NMOS pipe, drain electrode connects the described the 4th transistorized first utmost point;
The described the 4th transistorized the second utmost point ground connection;
Described the 4th resistance is connected on the described the 4th the transistorized the 3rd extremely between the negative terminal with described the 3rd diode;
The anode of described the 3rd diode is for the inversion operating voltage of the rectification circuit output that connects described switching mode DC/DC step-down isolated variable circuit;
Described the second electric capacity is connected on the described the 4th the transistorized the 3rd extremely with between the ground;
Described the 5th resistance is connected on the described the 4th the transistorized the 3rd extremely between the grid with described the 2nd NMOS pipe;
The described the 4th transistorized the 3rd utmost point is as the power supply state signal output part;
Described the 4th transistor is NPN triode or nmos switch pipe, the the described first very base stage of NPN triode or grid of nmos switch pipe, the the described second very emitter of NPN triode or source electrode of nmos switch pipe, the described the 3rd very collector electrode of NPN triode or the drain electrode of nmos switch pipe;
The source ground of described the 2nd NMOS pipe;
Described the 6th resistance is connected between the grid of drain electrode with described the 3rd NMOS pipe of described the 2nd NMOS pipe;
Described the 7th resistance be connected on described the 3rd NMOS pipe grid, the drain electrode between;
Described the 4th voltage stabilizing didoe is connected on the grid of described the 3rd NMOS pipe with between the ground, and the negative terminal of the 4th voltage stabilizing didoe is in the gate electrode side of the 3rd NMOS pipe;
Described the 8th resistance is connected on the drain electrode of described the 3rd NMOS pipe with between the high-tension battery;
Described the 3rd electric capacity is connected on the source electrode of described the 3rd NMOS pipe with between the ground;
Described the 9th resistance is connected between the negative terminal of source electrode with described the 3rd diode of described the 3rd NMOS pipe;
Described the 9th resistance is used for output critical activity voltage to described inverter controller with the tie point of the negative terminal of described the 3rd diode.
Better, the resistance of described the second resistance is greater than 10 times of the resistance of the first resistance.
Three-phase bridge type converter system of the present invention and urgent lower short-circuit protection circuit; adopt the mode of the AC signal of sense switch type DC/DC step-down isolated variable circuit secondary coil output; realization to rectification after the monitoring of d. c. voltage signal; inverter controller is automatically controlled three-phase bridge type converter and is entered urgent lower short-circuit mode according to the state of the AC signal of switching mode DC/DC step-down isolated variable circuit secondary coil output.Three-phase bridge type converter of the present invention system, owing to be at switching mode DC/DC step-down isolated variable circuit secondary coil sample detecting abnormal electrical power supply, be not subjected to the impact of rectification circuit, can make three-phase bridge type converter within very short time, respond abnormal electrical power supply, enter urgent lower short-circuit mode, effectively avoid high-voltage capacitance and power switch in the three-phase bridge type converter to be burnt.
Description of drawings
In order to be illustrated more clearly in technical scheme of the present invention, the below does simple the introduction to the accompanying drawing that will use required for the present invention, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is three-phase bridge type converter free-wheel mode schematic diagram;
Fig. 2 is switching mode DC/DC step-down isolated variable circuit diagram;
Fig. 3 is that three-phase bridge type converter enters urgent lower short-circuit mode schematic diagram;
Fig. 4 is the inverter controller supply power voltage monitoring method schematic diagram of commonly using;
Fig. 5 is three-phase bridge type converter system schematic of the present invention;
Fig. 6 is the urgent lower short-circuit protection circuit schematic diagram among three-phase bridge type converter one embodiment of system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme among the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, all other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belong to the scope of protection of the invention.
Embodiment one
The three-phase bridge type converter system as shown in Figure 5, comprises high-tension battery, switching mode DC/DC(DC-to-DC) isolated variable circuit, inverter controller, three-phase bridge type converter, promptly descend short-circuit protection circuit;
Three-phase bridge type converter, as shown in Figure 1, three brachium pontis are arranged, each brachium pontis comprises mutually upper brachium pontis power switch, two power switchs of lower brachium pontis power switch of serial connection, the up and down two ends of each brachium pontis connect respectively the positive and negative two ends of described high-tension battery, and three outputs of three-phase bridge type converter lay respectively at the tie point of brachium pontis power switch on each brachium pontis, lower brachium pontis power switch;
Described inverter controller, the opening of each power switch, the shutoff order that are used for three brachium pontis of control three-phase bridge type converter make that one group of amplitude of output equates between three outputs of three-phase bridge type converter, frequency equates, the three-phase electricity signal of 120 ° of phase phasic differences;
The other respectively fly-wheel diode in parallel of each power switch in the brachium pontis is in order to play the afterflow effect when three-phase bridge type converter output connects inductive load;
Power switch in the brachium pontis, can be power transistor (GTR), gate level turn-off thyristor (GTO), power field effect pipe (Power MOSFET), igbt (IGBT), integrated gate commutated thyristor (IGCT), SGCT (SGCT) etc., adopt IGBT as the power switch in the brachium pontis among Fig. 1, the collector electrode of each IGBT in the brachium pontis and an emitter two ends difference fly-wheel diode in parallel;
Described switching mode DC/DC(DC-to-DC) step-down isolated variable circuit as shown in Figure 2, comprises isolating transformer, rectification circuit;
The primary coil of described isolating transformer is used for connecing high direct voltage VDD_IN, high direct voltage VDD_IN is normally greater than the direct voltage of the inversion operating voltage VDD_P of described rectification circuit output, for example high direct voltage VDD_IN is 30V, and inversion operating voltage VDD_P is 15V.In electric automobile, high direct voltage VDD_IN derives from the PEU(Power Electronic Unit of electric automobile, electric power electronic module usually) in power management chip or DC/DC module;
The secondary coil of described isolating transformer connects the input of described rectification circuit;
Described rectification circuit output inversion operating voltage VDD_P is to described inverter controller;
Described urgent lower short-circuit protection circuit comprises supply power voltage testing circuit, emergency service circuit;
Described supply power voltage testing circuit, the secondary coil of the described switching mode DC/DC step-down of input termination isolated variable circuit is used for judging according to the output AC signal of secondary coil whether the supply power voltage of described switching mode DC/DC step-down isolated variable circuit is unusual;
When supply power voltage was unusual, described supply power voltage testing circuit output power supply state signal DRV_ctrl was true, and when supply power voltage was normal, described supply power voltage testing circuit output power supply state signal DRV_ctrl was false;
Described emergency service circuit, when power supply state signal DRV_ctrl is true time, described high-tension battery is carried out voltage transformation, output critical activity voltage ASCVDD is to described inverter controller, when power supply state signal DRV_ctrl is fictitious time, described emergency service circuit stops to export critical activity voltage ASCVDD to described inverter controller;
Described inverter controller, when power supply state signal DRV_ctrl is true time, take described critical activity voltage ASCVDD as operating voltage, and the output protection control signal controls three of described three-phase bridge type converter upper brachium pontis power switchs and turn-offs, and three lower brachium pontis power switchs are open-minded; When power supply state signal DRV_ctrl is fictitious time, take described switching mode DC/DC(DC-to-DC) the inversion operating voltage VDD_P of the rectification circuit of step-down isolated variable circuit output is as operating voltage, and output services control signal control three-phase bridge type converter output three-phase electricity signal;
Better, described inverter controller has normal power consumption mode, two kinds of mode of operations of low-power consumption mode, the power consumption of inverter controller under low-power consumption mode is less than the power consumption under normal power consumption mode, when power supply state signal DRV_ctrl was true (abnormal electrical power supply), described inverter controller worked in low-power consumption mode.
Embodiment two
Based on embodiment one, described urgent lower short-circuit protection circuit comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the first diode D1, the second diode D2, the 3rd diode D3, the 4th voltage stabilizing didoe VD, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, a NMOS pipe M1, the 2nd NMOS pipe M2, the 3rd NMOS pipe M3, the 4th transistor Q1;
Described the first resistance R 1, the second diode D2 are serially connected between the grid of secondary coil with described NMOS pipe M1 of described switching mode DC/DC step-down isolated variable circuit, and the negative terminal of the second diode D2 is in the gate electrode side of NMOS pipe M1;
Described the second resistance R 2, the first diode D1 are serially connected between the grid of secondary coil with described NMOS pipe M1 of described switching mode DC/DC step-down isolated variable circuit, and the anode of the first diode D1 is in the gate electrode side of NMOS pipe M1;
The resistance of described the second resistance R 2 is much larger than the resistance of the first resistance R 1; The resistance of better described the second resistance R 2 is greater than 10 times of the resistance of the first resistance R 1;
Described the first capacitor C 1 is connected on the grid of NMOS pipe M1 with between the ground;
Described the 3rd resistance R 3 is connected between the negative terminal of drain electrode with described the 3rd diode D3 of described NMOS pipe M1;
The source ground of described NMOS pipe M1, drain electrode connects first utmost point of described the 4th transistor Q1;
The second utmost point ground connection of described the 4th transistor Q1;
Described the 4th resistance R 4 is connected on the 3rd extremely between the negative terminal with described the 3rd diode D3 of described the 4th transistor Q1;
The inversion operating voltage VDD_P of the rectification circuit output of the described switching mode DC/DC step-down of the positive termination isolated variable circuit of described the 3rd diode D3;
Described the second capacitor C 2 be connected on described the 4th transistor Q1 the 3rd extremely with between the ground;
Described the 5th resistance R 5 is connected on the 3rd of described the 4th transistor Q1 and extremely manages between the grid of M2 with described the 2nd NMOS;
The 3rd utmost point of described the 4th transistor Q1 is as power supply state signal DRV_ctrl output, the 3rd very during low level of described the 4th transistor Q1, and power supply state signal DRV_ctrl is true, during for high level, power supply state signal DRV_ctrl is false;
Described the 4th transistor Q1 is NPN triode or nmos switch pipe; The the described first very base stage of NPN triode or grid of nmos switch pipe; The the described second very emitter of NPN triode or source electrode of nmos switch pipe; The described the 3rd very collector electrode of NPN triode or the drain electrode of nmos switch pipe;
The source ground of described the 2nd NMOS pipe M2;
Described the 6th resistance R 6 is connected between the grid of drain electrode with described the 3rd NMOS pipe M3 of described the 2nd NMOS pipe M2;
Described the 7th resistance R 7 is connected between the drain electrode of grid with described the 3rd NMOS pipe M3 of described the 3rd NMOS pipe M3;
Described the 4th voltage stabilizing didoe VD is connected on the grid of described the 3rd NMOS pipe M3 with between the ground, and the negative terminal of the 4th voltage stabilizing didoe VD is in the gate electrode side of the 3rd NMOS pipe M3;
Described the 8th resistance R 8 is connected on the drain electrode of described the 3rd NMOS pipe M3 with between the high-tension battery;
Described the 3rd capacitor C 3 is connected on the source electrode of described the 3rd NMOS pipe M3 with between the ground;
Described the 9th resistance R 9 is connected between the negative terminal of source electrode with described the 3rd diode D3 of described the 3rd NMOS pipe M3;
Described the 9th resistance R 9 is used for output critical activity voltage ASCVDD to described inverter controller with the tie point of the negative terminal of described the 3rd diode D3.
Urgent lower short-circuit protection circuit among the embodiment two; as the AC signal SEC SIDE of the secondary coil of switching mode DC/DC step-down isolated variable circuit during at positive half cycle; be the charging of the first capacitor C 1 by described the first resistance R 1, the second diode D2; when negative half period; the 3rd capacitor C 1 is by described the second resistance R 2, the first diode D1 discharge; since the resistance of the second resistance R 2 much larger than the resistance of the first resistance R 1, make the first capacitor C 1 in the discharge time constant of negative half period much larger than the charge constant at positive half cycle.
When described switching mode DC/DC step-down isolated variable circuit supply voltage was normal, the frequency of the AC signal SEC_SIDE of secondary coil and amplitude kept fixed value, and this moment, the voltage at the first capacitor C 1 two ends just was always, and managed the cut-in voltage V of M1 greater than a NMOS
GS_th, make NMOS pipe M1 conducting, make the 4th transistor Q1 cut-off, the power supply state signal DRV_ctrl of the 3rd utmost point of the 4th transistor Q1 is high level (vacation);
When the 3rd utmost point power supply state signal DRV_ctrl of the 4th transistor Q1 was high level (vacation), the 2nd NMOS pipe M2 was also with conducting, and the loop meeting that the 2nd NMOS pipe M2 conducting forms is so that high-tension battery is managed the gate-source voltage V of M3 at the 3rd NMOS
GSLess than cut-in voltage V
GS_th, the 3rd NMOS pipe M3 turn-offs, and high-tension battery HV stops to provide critical activity voltage ASCVDD.
When described switching mode DC/DC step-down isolated variable circuit supply electric voltage exception, the frequency of the AC signal SEC_SIDE of secondary coil or amplitude will diminish, for example frequency reduces, at this moment, the first capacitor C 1 both end voltage is at the cut-in voltage of positive half cycle greater than NMOS pipe M1, at the cut-in voltage of negative half period less than NMOS pipe M1, namely NMOS pipe M1 switches between conducting and cut-off back and forth.In this case, the 4th transistor Q1 also switches thereupon back and forth, because the charge constant of the second capacitor C 2 is much larger than discharge time constant, the power supply state signal DRV_ctrl of the 4th transistor Q1 the 3rd utmost point output will remain low level (very); Meanwhile, the 2nd NMOS pipe M2 will end, and high-tension battery HV will be greater than cut-in voltage V at the voltage VGS of the grid source electrode formation of the 3rd NMOS pipe M3
GS_th, so that the 3rd NMOS pipe M3 conducting, the 3rd voltage stabilizing didoe VD plays the effect of clamp critical activity voltage ASCVDD, critical activity voltage ASCVDD equals the 3rd voltage stabilizing didoe VD clamping voltage and deducts the 3rd NMOS pipe M3 cut-in voltage V
GS_th
When the AC signal SEC_SIDE amplitude of described switching mode DC/DC step-down isolated variable circuit secondary coil is 0V, obvious NMOS pipe M1 cut-off, then the 4th transistor Q1 conducting, the power supply state signal DRV_ctrl of the 4th transistor Q1 the 3rd utmost point output will remain low level, the 2nd NMOS pipe M2 cut-off this moment, high-tension battery HV is at the voltage V of the grid source electrode formation of the 3rd NMOS pipe M3
GSWill be greater than cut-in voltage V
GS_th, the 3rd NMOS pipe M3 conducting, HV provides emergency service by high-tension battery, and by voltage-stabiliser tube VD2 clamp emergency service voltage ASCVDD.
Three-phase bridge type converter of the present invention system, adopt the mode of the AC signal of sense switch type DC/DC step-down isolated variable circuit secondary coil output, realization to rectification after the monitoring of d. c. voltage signal, inverter controller is automatically controlled three-phase bridge type converter and is entered urgent lower short circuit (ASC) pattern according to the state of the AC signal of switching mode DC/DC step-down isolated variable circuit secondary coil output.Three-phase bridge type converter of the present invention system, owing to be at switching mode DC/DC step-down isolated variable circuit secondary coil sample detecting abnormal electrical power supply, be not subjected to the impact of rectification circuit, can make three-phase bridge type converter within very short time (tens microseconds), respond abnormal electrical power supply, enter urgent lower short circuit (ASC) pattern, effectively avoid high-voltage capacitance and power switch in the three-phase bridge type converter to be burnt.In addition; three-phase bridge type converter of the present invention system; after detecting abnormal electrical power supply; inverter controller can work in low-power consumption mode; thereby reduce the consumption to power supply; keep urgent lower short circuit (ASC) control of longer time, thereby make three-phase bridge type converter remain on for more time lower short-circuit protection state.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. a three-phase bridge type converter system is characterized in that, comprises high-tension battery, switching mode DC/DC isolated variable circuit, inverter controller, three-phase bridge type converter, promptly descends short-circuit protection circuit;
Three-phase bridge type converter, three brachium pontis are arranged, each brachium pontis comprises mutually upper brachium pontis power switch, two power switchs of lower brachium pontis power switch of serial connection, the up and down two ends of each brachium pontis connect respectively the positive and negative two ends of described high-tension battery, and three outputs of three-phase bridge type converter lay respectively at the tie point of brachium pontis power switch on each brachium pontis, lower brachium pontis power switch;
The other respectively fly-wheel diode in parallel of each power switch in the brachium pontis;
Described inverter controller is used for controlling the opening, turn-off of each power switch of three brachium pontis of described three-phase bridge type converter;
Described switching mode DC/DC step-down isolated variable circuit comprises isolating transformer, rectification circuit;
The primary coil of described isolating transformer is used for connecing high direct voltage;
The secondary coil of described isolating transformer connects the input of described rectification circuit;
Described rectification circuit output inversion operating voltage is to described inverter controller;
Described urgent lower short-circuit protection circuit comprises supply power voltage testing circuit, emergency service circuit;
Described supply power voltage testing circuit, the secondary coil of the described switching mode DC/DC step-down of input termination isolated variable circuit is used for judging according to the output AC signal of secondary coil whether the supply power voltage of described switching mode DC/DC step-down isolated variable circuit is unusual;
When supply power voltage was unusual, described supply power voltage testing circuit output power supply state signal was true, and when supply power voltage was normal, described supply power voltage testing circuit output power supply state signal was false;
Described emergency service circuit when the power supply state signal is true time, carries out voltage transformation to described high-tension battery, and output critical activity voltage when the power supply state signal is fictitious time, stops to export critical activity voltage to described inverter controller to described inverter controller;
Described inverter controller, when the power supply state signal is true time, take described critical activity voltage as operating voltage, and the output protection control signal controls three of described three-phase bridge type converter upper brachium pontis power switchs and turn-offs, and three lower brachium pontis power switchs are open-minded; When the power supply state signal is fictitious time, take the inversion operating voltage of the rectification circuit output of described switching mode DC/DC step-down isolated variable circuit as operating voltage, and output services control signal control three-phase bridge type converter output three-phase electricity signal.
2. three-phase bridge type converter according to claim 1 system is characterized in that,
Described high direct voltage derives from power management chip or the DC/DC module of electric automobile;
Described high direct voltage is higher than described inversion operating voltage, and less than high-tension battery voltage.
3. three-phase bridge type converter according to claim 1 system is characterized in that,
Described inverter controller has normal power consumption mode, two kinds of mode of operations of low-power consumption mode, and the power consumption of inverter controller under low-power consumption mode is less than the power consumption under normal power consumption mode;
Be true time at described power supply state signal, described inverter controller works in low-power consumption mode.
4. three-phase bridge type converter according to claim 1 system is characterized in that,
Power switch in the brachium pontis is igbt, the collector electrode of each igbt in the brachium pontis and an emitter two ends difference fly-wheel diode in parallel.
5. according to claim 1 to 4 each described three-phase bridge type converter systems, it is characterized in that,
Described urgent lower short-circuit protection circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first diode, the second diode, the 3rd diode, the 4th voltage stabilizing didoe, the first electric capacity, the second electric capacity, the 3rd electric capacity, NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe, the 4th transistor;
Described the first resistance, the second diode are serially connected between the grid of secondary coil with a described NMOS pipe of described switching mode DC/DC step-down isolated variable circuit, and the negative terminal of the second diode is in the gate electrode side of a NMOS pipe;
Described the second resistance, the first diode are serially connected between the grid of secondary coil with a described NMOS pipe of described switching mode DC/DC step-down isolated variable circuit, and the anode of the first diode is in the gate electrode side of a NMOS pipe;
The resistance of described the second resistance is greater than the resistance of the first resistance;
Described the first electric capacity is connected on the grid of a NMOS pipe with between the ground;
Described the 3rd resistance is connected between the negative terminal of drain electrode with described the 3rd diode of a described NMOS pipe;
The source ground of a described NMOS pipe, drain electrode connects the described the 4th transistorized first utmost point;
The described the 4th transistorized the second utmost point ground connection;
Described the 4th resistance is connected on the described the 4th the transistorized the 3rd extremely between the negative terminal with described the 3rd diode;
The inversion operating voltage of the rectification circuit output of the described switching mode DC/DC step-down of the positive termination isolated variable circuit of described the 3rd diode;
Described the second electric capacity is connected on the described the 4th the transistorized the 3rd extremely with between the ground;
Described the 5th resistance is connected on the described the 4th the transistorized the 3rd extremely between the grid with described the 2nd NMOS pipe;
The described the 4th transistorized the 3rd utmost point is as the power supply state signal output part, and the described the 4th the transistorized the 3rd very during low level, and the power supply state signal is true, and during for high level, the power supply state signal is false;
Described the 4th transistor is NPN triode or nmos switch pipe, the the described first very base stage of NPN triode or grid of nmos switch pipe, the the described second very emitter of NPN triode or source electrode of nmos switch pipe, the described the 3rd very collector electrode of NPN triode or the drain electrode of nmos switch pipe;
The source ground of described the 2nd NMOS pipe;
Described the 6th resistance is connected between the grid of drain electrode with described the 3rd NMOS pipe of described the 2nd NMOS pipe;
Described the 7th resistance be connected on described the 3rd NMOS pipe grid, the drain electrode between;
Described the 4th voltage stabilizing didoe is connected on the grid of described the 3rd NMOS pipe with between the ground, and the negative terminal of the 4th voltage stabilizing didoe is in the gate electrode side of the 3rd NMOS pipe;
Described the 8th resistance is connected on the drain electrode of described the 3rd NMOS pipe with between the high-tension battery;
Described the 3rd electric capacity is connected on the source electrode of described the 3rd NMOS pipe with between the ground;
Described the 9th resistance is connected between the negative terminal of source electrode with described the 3rd diode of described the 3rd NMOS pipe;
Described the 9th resistance is used for output critical activity voltage to described inverter controller with the tie point of the negative terminal of described the 3rd diode.
6. three-phase bridge type converter according to claim 5 system is characterized in that,
The resistance of described the second resistance is greater than 10 times of the resistance of the first resistance.
7. one kind is promptly descended short-circuit protection circuit, it is characterized in that, comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first diode, the second diode, the 3rd diode, the 4th voltage stabilizing didoe, the first electric capacity, the second electric capacity, the 3rd electric capacity, NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe, the 4th transistor;
Described the first resistance, the second diode are used for being serially connected between the grid of secondary coil with a described NMOS pipe of switching mode DC/DC step-down isolated variable circuit, and the negative terminal of the second diode is in the gate electrode side of a NMOS pipe;
Described the second resistance, the first diode are used for being serially connected between the grid of secondary coil with a described NMOS pipe of switching mode DC/DC step-down isolated variable circuit, and the anode of the first diode is in the gate electrode side of a NMOS pipe;
The resistance of described the second resistance is greater than the resistance of the first resistance;
Described the first electric capacity is connected on the grid of a NMOS pipe with between the ground;
Described the 3rd resistance is connected between the negative terminal of drain electrode with described the 3rd diode of a described NMOS pipe;
The source ground of a described NMOS pipe, drain electrode connects the described the 4th transistorized first utmost point;
The described the 4th transistorized the second utmost point ground connection;
Described the 4th resistance is connected on the described the 4th the transistorized the 3rd extremely between the negative terminal with described the 3rd diode;
The anode of described the 3rd diode is for the inversion operating voltage of the rectification circuit output that connects described switching mode DC/DC step-down isolated variable circuit;
Described the second electric capacity is connected on the described the 4th the transistorized the 3rd extremely with between the ground;
Described the 5th resistance is connected on the described the 4th the transistorized the 3rd extremely between the grid with described the 2nd NMOS pipe;
The described the 4th transistorized the 3rd utmost point is as the power supply state signal output part;
Described the 4th transistor is NPN triode or nmos switch pipe, the the described first very base stage of NPN triode or grid of nmos switch pipe, the the described second very emitter of NPN triode or source electrode of nmos switch pipe, the described the 3rd very collector electrode of NPN triode or the drain electrode of nmos switch pipe;
The source ground of described the 2nd NMOS pipe;
Described the 6th resistance is connected between the grid of drain electrode with described the 3rd NMOS pipe of described the 2nd NMOS pipe;
Described the 7th resistance be connected on described the 3rd NMOS pipe grid, the drain electrode between;
Described the 4th voltage stabilizing didoe is connected on the grid of described the 3rd NMOS pipe with between the ground, and the negative terminal of the 4th voltage stabilizing didoe is in the gate electrode side of the 3rd NMOS pipe;
Described the 8th resistance is connected on the drain electrode of described the 3rd NMOS pipe with between the high-tension battery;
Described the 3rd electric capacity is connected on the source electrode of described the 3rd NMOS pipe with between the ground;
Described the 9th resistance is connected between the negative terminal of source electrode with described the 3rd diode of described the 3rd NMOS pipe;
Described the 9th resistance is used for output critical activity voltage to described inverter controller with the tie point of the negative terminal of described the 3rd diode.
8. urgent lower short-circuit protection circuit according to claim 7 is characterized in that,
The resistance of described the second resistance is greater than 10 times of the resistance of the first resistance.
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| CN113472270A (en) * | 2020-03-31 | 2021-10-01 | 广州汽车集团股份有限公司 | Motor circuit protection method and system |
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