CN105471234A - Optical fiber signal conversion circuit for 3,300V high-power IGBT driver - Google Patents
Optical fiber signal conversion circuit for 3,300V high-power IGBT driver Download PDFInfo
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- CN105471234A CN105471234A CN201510941984.8A CN201510941984A CN105471234A CN 105471234 A CN105471234 A CN 105471234A CN 201510941984 A CN201510941984 A CN 201510941984A CN 105471234 A CN105471234 A CN 105471234A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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Abstract
The invention proposes an optical fiber signal conversion circuit for a 3,300V high-power IGBT driver. The optical fiber signal conversion circuit comprises an upper bridge optical fiber signal conversion circuit, a lower bridge optical fiber signal conversion circuit and an upper and lower bridge driver interlocking circuit arranged between the upper bridge optical fiber signal conversion circuit and the lower bridge optical fiber signal conversion circuit, wherein in the upper bridge optical fiber signal conversion circuit, an upper bridge signal delay circuit performs delay on an upper bridge driver signal and transmits the upper bridge driver signal to an upper bridge amplifier circuit and a first optical transmitter in sequence, and the first optical transmitter converts the upper bridge driver signal into an optical signal and outputs the optical signal to an IGBT upper bridge driver circuit; in the lower bridge optical fiber signal conversion circuit, a lower bridge signal delay circuit performs delay on a lower bridge driver signal and transmits the lower bridge driver signal to the upper bridge amplifier circuit and a second optical transmitter in sequence, and the second optical transmitter converts the lower bridge driver signal into an optical signal and outputs the optical signal to an IGBT lower bridge driver circuit; and the upper and lower bridge driver interlocking circuit realizes the interlocking of the upper and lower bridge driver signals. According to the optical fiber signal conversion circuit, not only can the dead time between driver signals of two IGBTs of upper and lower bridge arms be adjusted but also the two IGBTs of the upper and lower bridge arms can be ensured not to be conducted at the same time.
Description
Technical field
The present invention relates to a kind of fiber-optic signal change-over circuit driven for 3300V high-power IGBT, belong to electroporation field.
Background technology
At present, the high-power mineral flame-proof type transducer of 1140V obtains at underground coal mine and applies more and more widely.1140V big-power transducer generally adopts the high-power IGBT of withstand voltage 3300V, as FZ1200R33KF2C, FZ800R33KF2C of Infineon.Consider the antijamming capability of entire system, the driving of this IGBT adopts the plug and play type drive plate of CONCEPT company as 1SD536F2 and 1SP0635x2xx etc. more, and drive singal and fault feedback signal adopt fiber-optic signal, and drive circuit and IGBT install nearby.
Optical fiber cable is made up of glass or plastics, so without directly electrical connection between Fiber connection reflector and receiver, energy isolation voltage, to prevent mutual interference, does not produce spurious radiation, insensitive to EMI.So can accurately conduct PWM(pulse width modulation with optical fiber between driving and control circuit) signal, not only solve the isolation of the strong and weak electricity between power circuit and control circuit, electromagnetism interference problem, and the long-distance transmissions that can also realize drive singal.The another one feature of optical fiber to realize signal High Speed Transfer, when reducing propagation delay time.
Adopt this fiber-optic signal to carry out transmission and the isolation of drive singal, need between master control borad and IGBT drive circuit, increase fiber-optic signal change-over circuit, as shown in Figure 1.Master control borad generates the drive singal of 6 road PWM, and the 6 road signals of telecommunication are converted to light signal by fiber-optic signal change-over circuit, after Optical Fiber Transmission carries out amplification process to IGBT drive circuit, drives IGBT work.Meanwhile, the fault feedback signal of IGBT drive circuit is also by optical fiber, and Real-time Feedback is to control circuit.With screw, IGBT drive plate is arranged on IGBT, the gate electrode drive signals of IGBT is transmitted on the shortest circuit, greatly reduce the probability of electromagnetic interference, make that control circuit can judge more accurately, the operating state of control IGBT, thus ensure that entire system steady operation.Therefore, develop a kind of fiber-optic signal change-over circuit that 6 road PWM drive singal can be converted to light signal and become particularly important.
Summary of the invention
Instant invention overcomes the deficiency that prior art exists, provide a kind of fiber-optic signal change-over circuit driven for 3300V high-power IGBT.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of fiber-optic signal change-over circuit driven for 3300V high-power IGBT, comprise bridge fiber-optic signal change-over circuit, lower bridge fiber-optic signal change-over circuit and be arranged on the driving of the bridge up and down interlock circuit between upper and lower bridge optical fiber changeover circuit, upper bridge fiber-optic signal change-over circuit comprises bridge signal delay circuit and upper bridge amplifying circuit, and lower bridge fiber-optic signal change-over circuit comprises lower bridge signal delay circuit and lower bridge amplifying circuit, the signal input part of described upper bridge signal delay circuit is connected with upper bridge PWM drive singal, the signal input part of described upper bridge amplifying circuit is connected with the signal output part of described upper bridge signal delay circuit, the signal output part of described upper bridge amplifying circuit is connected with the signal input part of described first optical transmitting set, described upper bridge signal delay circuit is transferred to described upper bridge amplifying circuit after being used for carrying out time delay to the forward position of upper bridge PWM drive singal, described upper bridge amplifying circuit is used for being transferred to described first optical transmitting set by after the upper bridge PWM drive singal amplification after time delay, described first optical transmitting set is used for outputting to bridge drive circuit on IGBT after the upper bridge PWM drive singal after by amplification is converted to light signal, the signal input part of described lower bridge signal delay circuit is connected with lower bridge PWM drive singal, the signal input part of described lower bridge amplifying circuit is connected with the signal output part of described lower bridge signal delay circuit, the signal output part of described lower bridge amplifying circuit is connected with the signal input part of described second optical transmitting set, described lower bridge signal delay circuit is transferred to described upper bridge amplifying circuit after being used for carrying out time delay to the forward position of lower bridge PWM drive singal, described upper bridge amplifying circuit is used for being transferred to described second optical transmitting set by after the upper bridge PWM drive singal amplification after time delay, described second optical transmitting set outputs to bridge drive circuit under IGBT after being used for that the lower bridge PWM drive singal after amplifying is converted to light signal, described upper and lower bridge drives the signal input part of interlock circuit to be connected with the signal output part of described upper bridge signal delay circuit and lower bridge signal delay circuit, signal output part is connected with the signal output part of described upper bridge amplifying circuit and described lower bridge amplifying circuit, described driving interlock circuit is used for when lower bridge drive singal is high, drag down the upper bridge PWM drive singal being transferred to described first optical transmitting set, and, when upper bridge drive singal is high, drag down the lower bridge PWM drive singal being transferred to described second optical transmitting set.
The described fiber-optic signal change-over circuit driven for 3300V high-power IGBT, also comprise the fault feedback signal for receiving upper and lower bridge IGBT drive circuit respectively, and pass through the upper bridge failure indicating circuit of diode displaying and lower bridge failure indicating circuit, described upper bridge failure indicating circuit comprises bridge optical receiver, first NAND gate, first light-emitting diode and the first resistance, described upper bridge optical receiver receives the fault feedback signal of upper bridge IGBT drive circuit, and be converted into the signal input part that the signal of telecommunication flows to described upper bridge first NAND gate, another input of described first NAND gate is connected with the signal output part of described upper bridge signal delay circuit, the signal output part of described NAND gate is connected with the negative pole of described light-emitting diode, the positive pole of described first light-emitting diode is connected with the first resistance, the other end of described first resistance is connected with positive source, described lower bridge failure indicating circuit comprises lower bridge optical receiver, second NAND gate, second light-emitting diode and the second resistance, described lower bridge optical receiver receives the fault feedback signal of lower bridge IGBT drive circuit, and be converted into the signal input part that the signal of telecommunication flows to described second NAND gate, another input of described second NAND gate is connected with the signal output part of described lower bridge signal delay circuit, the signal output part of described NAND gate is connected with the negative pole of described second light-emitting diode, the positive pole of described second light-emitting diode is connected with the second resistance, the other end of described second resistance is connected with positive source.
Described upper bridge signal delay circuit comprises bridge potentiometer, upper bridge electric capacity, upper bridge time delay NAND gate, upper bridge PWM drive singal is divided into two-way, one tunnel is connected with a signal input part of described upper bridge time delay NAND gate, another road after described upper bridge potentiometer with another signal input part of described upper bridge time delay NAND gate, the signal output part of described upper bridge adjustable potentiometer is connected to the ground by described upper bridge electric capacity; Described lower bridge signal delay circuit comprises lower bridge potentiometer, lower bridge electric capacity, lower bridge time delay NAND gate, lower bridge PWM drive singal is divided into two-way, one tunnel is connected with a signal input part of described lower bridge time delay NAND gate, another road after described lower bridge potentiometer with another signal input part of described lower bridge time delay NAND gate, the signal output part of described lower bridge adjustable potentiometer is connected to the ground by described lower bridge electric capacity.
Described upper bridge amplifying circuit comprises bridge first resistance, upper bridge second resistance, upper bridge first crystal triode, one end of described upper bridge first resistance is connected with the signal output part of described upper bridge signal delay circuit, the other end of described upper bridge first resistance is connected with the base stage of described upper bridge first crystal triode, the emitter of described upper bridge first crystal triode is connected with the signal input part of described first optical transmitting set, one end of described upper bridge second resistance is connected with positive source, and the other end is connected with the emitter of described upper bridge first crystal triode; Described lower bridge amplifying circuit comprises lower bridge first resistance, lower bridge second resistance, lower bridge first crystal triode, one end of described lower bridge first resistance is connected with the signal output part of described lower bridge signal delay circuit, the other end of described lower bridge first resistance is connected with the base stage of described lower bridge first crystal triode, the emitter of described lower bridge first crystal triode is connected with the signal input part of described first optical transmitting set, one end of described lower bridge second resistance is connected with positive source, and the other end is connected with the emitter of described lower bridge first crystal triode.
Described upper and lower bridge drives interlock circuit to comprise bridge lock-in circuit and lower bridge lock-in circuit, described upper bridge lock-in circuit comprises bridge the 3rd resistance, upper bridge second transistor, one end of described upper bridge the 3rd resistance is connected with the signal output part of described lower bridge delay circuit, the other end of described upper bridge the 3rd resistance is connected with the base stage of described upper bridge second transistor, the collector electrode of described upper bridge second transistor is connected with the signal input part of described first optical transmitting set, the grounded emitter of described upper bridge transistor; Described lower bridge lock-in circuit comprises lower bridge the 3rd resistance, lower bridge second transistor, one end of described lower bridge the 3rd resistance is connected with the signal output part of described lower bridge delay circuit, the other end of described lower bridge the 3rd resistance is connected with the base stage of described lower bridge second transistor, the collector electrode of described lower bridge second transistor is connected with the signal input part of described first optical transmitting set, the grounded emitter of described lower bridge transistor.
The described fiber-optic signal change-over circuit driven for 3300V high-power IGBT, also comprise bridge fiber-optic signal change-over circuit on second, second time bridge fiber-optic signal change-over circuit and be arranged on about the second bridge driving interlock circuit on second between bridge fiber-optic signal change-over circuit and second time bridge fiber-optic signal change-over circuit, and on the 3rd, bridge fiber-optic signal change-over circuit, the 3rd time bridge fiber-optic signal change-over circuit and about the 3rd bridge be arranged on the described 3rd between bridge fiber-optic signal change-over circuit and the 3rd time bridge fiber-optic signal change-over circuit drive interlock circuit.
Compared with prior art, the present invention has following beneficial effect: the PWM signal of telecommunication can be converted to optical signal transmission to IGBT drive circuit by (1); (2) time delay of adjustable pwm signal, realizes the adjustment of the Dead Time between upper and lower bridge arm two IGBT drive singal; (3) realize the interlocking of upper and lower two-way drive singal, ensure that upper and lower bridge arm two IGBT can not conducting simultaneously; (4) transfer fault feedback signal to the signal of telecommunication, carry out faulty indication.
Accompanying drawing explanation
Fig. 1 is in prior art, adopts fiber-optic signal to drive the operation principle of IGBT;
Fig. 2 is the circuit block diagram of a kind of fiber-optic signal change-over circuit for the driving of 3300V high-power IGBT of the present invention;
Fig. 3 is the circuit connection diagram of a kind of fiber-optic signal change-over circuit for the driving of 3300V high-power IGBT of the present invention.
Embodiment
In order to understand substantive distinguishing features of the present invention further, below in conjunction with the drawings and specific embodiments, the present invention is described further, because 3 tunnel IGBT drive circuit are basic equivalences, therefore, 6 road circuit in the fiber-optic signal change-over circuit driven for 3300V high-power IGBT that the present invention proposes are made up of the circuit that three comprise upper and lower bridge two-way, for convenience, following examples are only described in detail to the circuit that one of them comprises upper and lower bridge two-way.
As shown in Figure 2, a kind of fiber-optic signal change-over circuit driven for 3300V high-power IGBT that the embodiment of the present invention one provides, comprise bridge fiber-optic signal change-over circuit, lower bridge fiber-optic signal change-over circuit and be arranged on the driving of the bridge up and down interlock circuit between upper and lower bridge optical fiber changeover circuit, wherein, upper bridge fiber-optic signal change-over circuit comprises bridge signal delay adjustment circuit and upper bridge amplifying circuit, and lower bridge fiber-optic signal change-over circuit comprises lower bridge signal delay adjustment circuit and lower bridge amplifying circuit.
The signal input part of upper bridge signal delay circuit is connected with upper bridge drive singal PWM1, the signal input part of upper bridge amplifying circuit is connected with the signal output part of upper bridge signal delay circuit, the signal output part of upper bridge amplifying circuit is connected with the signal input part of the first optical transmitting set G3, upper bridge signal delay circuit is transferred to upper bridge amplifying circuit after being used for carrying out time delay to the forward position of upper bridge drive singal PWM1, upper bridge amplifying circuit is used for being transferred to the first optical transmitting set G3 by after the upper bridge drive singal PWM1 amplification after time delay, first optical transmitting set G3 is used for outputting to bridge drive circuit on IGBT after the upper bridge drive singal PWM1 after by amplification is converted to light signal.
The signal input part of lower bridge signal delay circuit is connected with lower bridge drive singal PWM2, the signal input part of lower bridge amplifying circuit is connected with the signal output part of lower bridge signal delay circuit, the signal output part of lower bridge amplifying circuit is connected with the signal input part of the second optical transmitting set G4, lower bridge signal delay circuit is transferred to lower bridge amplifying circuit after being used for carrying out time delay to the forward position of lower bridge drive singal PWM2, lower bridge amplifying circuit is used for being transferred to the second optical transmitting set G4 by after the lower bridge drive singal PWM2 amplification after time delay, second optical transmitting set G4 outputs to bridge drive circuit under IGBT after being used for that the lower bridge drive singal PWM2 after amplifying is converted to light signal.
By the adjustment of upper and lower bridge signal delay circuit, time delay can be carried out to the forward position of the pwm signal of input, and delay time can adjust, thus realize the adjustment of the Dead Time between upper and lower bridge arm two IGBT drive singal.
Upper and lower bridge drives the signal input part of interlock circuit to be connected with the signal output part of upper bridge signal delay circuit and lower bridge signal delay circuit, signal output part is connected with the signal output part of upper bridge amplifying circuit and lower bridge amplifying circuit, interlock circuit is driven to be used for when lower bridge drive singal is high, drag down the upper bridge drive singal PWM1 being transferred to the first optical transmitting set, and, when upper bridge drive singal is high, drag down the lower bridge drive singal PWM2 being transferred to the second optical transmitting set, therefore, upper and lower two-way drive singal can not be high simultaneously, upper and lower bridge arm two IGBT can not simultaneously conducting, ensure that the safety of IGBT.
As shown in Figure 2, a kind of fiber-optic signal change-over circuit driven for 3300V high-power IGBT that the embodiment of the present invention one provides, also comprise the fault feedback signal for receiving IGBT drive circuit, and pass through the upper bridge failure indicating circuit of diode displaying and lower bridge failure indicating circuit, when optical receiver G1 receives the fault feedback signal of upper bridge IGBT drive circuit, light-emitting diode D1 electrified light emitting in upper bridge failure indicating circuit, indication fault; When optical receiver G2 receives the fault feedback signal of lower bridge IGBT drive circuit, the light-emitting diode D2 electrified light emitting in lower bridge failure indicating circuit, indication fault.
As shown in Figure 3, for a kind of fiber-optic signal change-over circuit driven for 3300V high-power IGBT that the embodiment of the present invention two provides, comprise bridge fiber-optic signal change-over circuit, lower bridge fiber-optic signal change-over circuit and be arranged on the driving of the bridge up and down interlock circuit between upper and lower bridge optical fiber changeover circuit.
Wherein, in upper bridge fiber-optic signal change-over circuit, potentiometer W1, electric capacity C3, NAND gate U1B constitute bridge signal delay circuit, upper bridge drive singal PWM1 is divided into two-way, one tunnel is directly connected with a signal input part of NAND gate U1B, and another road is connected with another signal input part of NAND gate U1B after potentiometer W1, in addition, the signal output part of potentiometer W1 is also connected to the ground by electric capacity C3, and upper bridge drive singal PWM1 is also connected to the ground by resistance R3; Resistance R5, R9 and transistor Q1 constitutes bridge amplifying circuit, one end of resistance R5 is connected with the signal output part of upper bridge signal delay circuit, the other end is connected with the base stage of transistor Q1, the emitter of transistor Q1 is connected with the signal input part of optical transmitting set G3, one end of resistance R9 is connected with positive pole VCC, and the other end is connected with the emitter of transistor Q1; In addition, transistor Q1 grounded collector.Upper bridge signal delay circuit is for adjusting the time delay of upper bridge drive singal PWM1, upper bridge amplifying circuit is used for exporting to optical transmitting set G3 by after the drive singal PWM1 amplification after time delay, and optical transmitting set G3 is for converting the drive singal PWM1 after amplification to optical signal transmission to bridge drive circuit on IGBT.
Wherein, in lower bridge fiber-optic signal change-over circuit, potentiometer W2, electric capacity C4, NAND gate U2C constitute lower bridge signal delay circuit, lower bridge drive singal PWM2 is divided into two-way, one tunnel is directly connected with a signal input part of NAND gate U2C, and another road is connected with another signal input part of NAND gate U2C after potentiometer W2, in addition, the signal output part of potentiometer W2 is also connected to the ground by electric capacity C4, and lower bridge drive singal PWM2 is also connected to the ground by resistance R4; Resistance R6, R10 and transistor Q2 constitutes bridge amplifying circuit, one end of resistance R6 is connected with the signal output part of lower bridge signal delay circuit, the other end is connected with the base stage of transistor Q2, the emitter of transistor Q2 is connected with the signal input part of optical transmitting set G4, one end of resistance R10 is connected with positive pole VCC, and the other end is connected with the emitter of transistor Q2; In addition, transistor Q1 grounded collector.Lower bridge signal delay circuit is for adjusting the time delay of lower bridge drive singal PWM2, lower bridge amplifying circuit is used for exporting to optical transmitting set G4 by after the drive singal PWM2 amplification after time delay, and optical transmitting set G4 is used for the drive singal PWM2 after by amplification and converts optical signal transmission to bridge drive circuit under IGBT.
In addition, upper bridge signal delay circuit also comprises the NAND gate U1D between NAND gate U1B and resistance R5, and two signal incoming end is all connected with the signal output part of NAND gate U1B, and its signal output part is connected with resistance R5, lower bridge signal delay circuit also comprises the NAND gate U2A between NAND gate U2C and resistance R6, two signal incoming end is all connected with the signal output part of NAND gate U1C, its signal output part is connected with resistance R6, NAND gate U1D and NAND gate U2A is used for signals reverse, upper bridge signal delay circuit and lower bridge signal delay circuit are used for carrying out time delay to the forward position of the drive singal of the upper and lower bridge of PWM of input respectively, delay time is by potentiometer W1 and resistance C3(or potentiometer W2 and resistance C4) value jointly determine, when potentiometer W1 is 10k Ω, when C3 is 1nF, there is the time delay of 0 ~ 10us in the forward position that can realize PWM1 drive singal, therefore, by adjusting the value of potentiometer W1 and potentiometer W2, the time delay of PWM1 and PWM2 signal can be adjusted respectively, realize the adjustment of the Dead Time between upper and lower bridge arm two IGBT drive singal.
Wherein, upper and lower bridge drives in interlock circuit, resistance R8, transistor Q4, constitute bridge lock-in circuit, one end of resistance R8 is connected with the signal output part of lower bridge delay circuit, and the other end of resistance R8 is connected with the base stage of transistor Q4, the collector electrode of transistor Q4 is connected with the signal input part of optical transmitting set G3, the grounded emitter of transistor Q4; Resistance R7, transistor Q3, constitute lower bridge lock-in circuit, one end of resistance R7 is connected with the signal output part of upper bridge delay circuit, the other end of resistance R7 is connected with the base stage of transistor Q3, the collector electrode of transistor Q3 is connected with the signal input part of optical transmitting set G4, the grounded emitter of transistor Q3.When upper bridge drive singal PWM1 is high, by the effect of resistance R7, transistor Q3, can, by the lower bridge drive singal of X3D point, the input signal of bridge optical transmitting set G4 be namely descended to drag down; Instantly when bridge drive singal PWM2 is high, by the effect of resistance R8, transistor Q4, can by the upper bridge drive singal of X3U point, the input signal namely going up bridge optical transmitting set G3 drags down; Therefore, upper and lower bridge two-way drive singal can not be high simultaneously, and upper and lower bridge arm two IGBT can not conducting simultaneously, ensure that the safety of IGBT.
Wherein, optical transmitting set G3 and G4 can adopt the HFBR-1522 of Avago company (Avago), the high-quality transmission of direct current ~ 10MHz signal can be realized, therefore, the PWM signal of telecommunication not only will can be converted to optical signal transmission to IGBT drive circuit by the fiber-optic signal change-over circuit of the present embodiment, the also time delay of adjustable pwm signal, realizes the adjustment of the Dead Time between upper and lower bridge arm two IGBT drive singal; Further, the interlocking of upper and lower two-way drive singal can also be realized, ensure that upper and lower bridge arm two IGBT can not conducting simultaneously.
In addition, a kind of fiber-optic signal change-over circuit for the driving of 3300V high-power IGBT that the present embodiment provides also comprises, for receiving the fault feedback signal of upper and lower bridge IGBT drive circuit respectively, and pass through the upper bridge failure indicating circuit of diode displaying and lower bridge failure indicating circuit.Wherein, upper bridge failure indicating circuit comprises optical receiver G1, NAND gate U1A, light-emitting diode D1 and resistance R1, the fault feedback signal of bridge IGBT drive circuit in optical receiver G1 reception, and be converted into the signal input part that the signal of telecommunication flows to NAND gate U1A, another signal input part of NAND gate U1A is connected with the signal output part of upper bridge signal delay circuit, the signal output part of NAND gate U1A is connected with the negative pole of light-emitting diode D1, the positive pole of light-emitting diode D1 is connected with one end of resistance R1, and the other end of resistance R1 is connected with positive source VCC; When upper bridge IGBT has drive singal, and when the fault feedback signal of upper bridge IGBT drive circuit is high, NAND gate U1A output LOW voltage, light-emitting diode D1 is lit.
Lower bridge failure indicating circuit comprises optical receiver G2, NAND gate U2B, light-emitting diode D2 and resistance R2, optical receiver G2 receives the fault feedback signal of lower bridge IGBT drive circuit, and be converted into the signal input part that the signal of telecommunication flows to NAND gate U2B, another input of NAND gate U2B is connected with the signal output part of lower bridge signal delay circuit, the signal output part of NAND gate U2B is connected with the negative pole of light-emitting diode D2, the positive pole of light-emitting diode D2 is connected with resistance R2, the other end of resistance R2 is connected with positive source VCC, instantly bridge IGBT has drive singal, and the fault feedback signal of lower bridge IGBT drive circuit is when being high, NAND gate U2B output LOW voltage, light-emitting diode D2 is lit.
Wherein, optical receiver G1 and G2 can adopt Avago company (Avago) HFBR-2522, the timely transmission of fault-signal can be realized, therefore, the fiber-optic signal change-over circuit of the present embodiment can also transfer fault feedback signal to the signal of telecommunication, and carries out faulty indication by light-emitting diode.
In addition, above-described embodiment has only done detailed description to the wherein two-way of fiber-optic signal change-over circuit, it is clearly understood that, a kind of fiber-optic signal change-over circuit driven for 3300V high-power IGBT provided by the invention, not merely be only limited to above-mentioned upper and lower bridge two-way fiber-optic signal change-over circuit, bridge fiber-optic signal change-over circuit on second can also be comprised, second time bridge fiber-optic signal change-over circuit and about the second bridge be arranged on second between bridge optical fiber changeover circuit and second time bridge optical fiber changeover circuit drive interlock circuit, and bridge fiber-optic signal change-over circuit on the 3rd, 3rd time bridge fiber-optic signal change-over circuit and about the 3rd bridge be arranged on the 3rd between bridge fiber-optic signal change-over circuit and the 3rd time bridge fiber-optic signal change-over circuit drive interlock circuit, wherein second, the specific features of about the 3rd bridge fiber-optic signal change-over circuit is identical with the above-mentioned fiber-optic signal of bridge up and down change-over circuit, second, about 3rd bridge drives the specific features of interlock circuit and above-mentioned bridge up and down to drive interlock circuit identical, thus make the above-mentioned three upper and lower bridges in tunnel, 6 road fiber-optic signal change-over circuits may be used for conversion and the propagation of the fiber-optic signal that three-phase IGBT drives altogether.
By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (6)
1. the fiber-optic signal change-over circuit driven for 3300V high-power IGBT, comprise bridge fiber-optic signal change-over circuit, lower bridge fiber-optic signal change-over circuit and be arranged on the driving of the bridge up and down interlock circuit between upper and lower bridge optical fiber changeover circuit, it is characterized in that, described upper bridge fiber-optic signal change-over circuit comprises bridge signal delay circuit and upper bridge amplifying circuit, and described lower bridge fiber-optic signal change-over circuit comprises lower bridge signal delay circuit and lower bridge amplifying circuit;
The signal input part of described upper bridge signal delay circuit is connected with upper bridge PWM drive singal, the signal input part of described upper bridge amplifying circuit is connected with the signal output part of described upper bridge signal delay circuit, the signal output part of described upper bridge amplifying circuit is connected with the signal input part of described first optical transmitting set, described upper bridge signal delay circuit is transferred to described upper bridge amplifying circuit after being used for carrying out time delay to the forward position of upper bridge PWM drive singal, described upper bridge amplifying circuit is used for being transferred to described first optical transmitting set by after the upper bridge PWM drive singal amplification after time delay, described first optical transmitting set is used for outputting to bridge drive circuit on IGBT after the upper bridge PWM drive singal after by amplification is converted to light signal,
The signal input part of described lower bridge signal delay circuit is connected with lower bridge PWM drive singal, the signal input part of described lower bridge amplifying circuit is connected with the signal output part of described lower bridge signal delay circuit, the signal output part of described lower bridge amplifying circuit is connected with the signal input part of described second optical transmitting set, described lower bridge signal delay circuit is transferred to described upper bridge amplifying circuit after being used for carrying out time delay to the forward position of lower bridge PWM drive singal, described upper bridge amplifying circuit is used for being transferred to described second optical transmitting set by after the upper bridge PWM drive singal amplification after time delay, described second optical transmitting set outputs to bridge drive circuit under IGBT after being used for that the lower bridge PWM drive singal after amplifying is converted to light signal,
Described upper and lower bridge drives the signal input part of interlock circuit to be connected with the signal output part of described upper bridge signal delay circuit and lower bridge signal delay circuit, signal output part is connected with the signal output part of described upper bridge amplifying circuit and described lower bridge amplifying circuit, described driving interlock circuit is used for when lower bridge drive singal is high, drag down the upper bridge PWM drive singal being transferred to described first optical transmitting set, and, when upper bridge drive singal is high, drag down the lower bridge PWM drive singal being transferred to described second optical transmitting set.
2. the fiber-optic signal change-over circuit driven for 3300V high-power IGBT according to claim 1, it is characterized in that, also comprise the fault feedback signal for receiving upper and lower bridge IGBT drive circuit respectively, and pass through the upper bridge failure indicating circuit of diode displaying and lower bridge failure indicating circuit, described upper bridge failure indicating circuit comprises bridge optical receiver, first NAND gate, first light-emitting diode and the first resistance, described upper bridge optical receiver receives the fault feedback signal of upper bridge IGBT drive circuit, and be converted into the signal input part that the signal of telecommunication flows to described upper bridge first NAND gate, another input of described first NAND gate is connected with the signal output part of described upper bridge signal delay circuit, the signal output part of described NAND gate is connected with the negative pole of described light-emitting diode, the positive pole of described first light-emitting diode is connected with the first resistance, the other end of described first resistance is connected with positive source,
Described lower bridge failure indicating circuit comprises lower bridge optical receiver, second NAND gate, second light-emitting diode and the second resistance, described lower bridge optical receiver receives the fault feedback signal of lower bridge IGBT drive circuit, and be converted into the signal input part that the signal of telecommunication flows to described second NAND gate, another input of described second NAND gate is connected with the signal output part of described lower bridge signal delay circuit, the signal output part of described NAND gate is connected with the negative pole of described second light-emitting diode, the positive pole of described second light-emitting diode is connected with the second resistance, the other end of described second resistance is connected with positive source.
3. the fiber-optic signal change-over circuit driven for 3300V high-power IGBT according to claim 1, it is characterized in that, described upper bridge signal delay circuit comprises bridge potentiometer, upper bridge electric capacity, upper bridge time delay NAND gate, upper bridge PWM drive singal is divided into two-way, one tunnel is connected with a signal input part of described upper bridge time delay NAND gate, another road after described upper bridge potentiometer with another signal input part of described upper bridge time delay NAND gate, the signal output part of described upper bridge adjustable potentiometer is connected to the ground by described upper bridge electric capacity;
Described lower bridge signal delay circuit comprises lower bridge potentiometer, lower bridge electric capacity, lower bridge time delay NAND gate, lower bridge PWM drive singal is divided into two-way, one tunnel is connected with a signal input part of described lower bridge time delay NAND gate, another road after described lower bridge potentiometer with another signal input part of described lower bridge time delay NAND gate, the signal output part of described lower bridge adjustable potentiometer is connected to the ground by described lower bridge electric capacity.
4. the fiber-optic signal change-over circuit driven for 3300V high-power IGBT according to claim 1, it is characterized in that, described upper bridge amplifying circuit comprises bridge first resistance, upper bridge second resistance, upper bridge first crystal triode, one end of described upper bridge first resistance is connected with the signal output part of described upper bridge signal delay circuit, the other end of described upper bridge first resistance is connected with the base stage of described upper bridge first crystal triode, the emitter of described upper bridge first crystal triode is connected with the signal input part of described first optical transmitting set, one end of described upper bridge second resistance is connected with positive source, the other end is connected with the emitter of described upper bridge first crystal triode,
Described lower bridge amplifying circuit comprises lower bridge first resistance, lower bridge second resistance, lower bridge first crystal triode, one end of described lower bridge first resistance is connected with the signal output part of described lower bridge signal delay circuit, the other end of described lower bridge first resistance is connected with the base stage of described lower bridge first crystal triode, the emitter of described lower bridge first crystal triode is connected with the signal input part of described first optical transmitting set, one end of described lower bridge second resistance is connected with positive source, and the other end is connected with the emitter of described lower bridge first crystal triode.
5. the fiber-optic signal change-over circuit driven for 3300V high-power IGBT according to claim 1, it is characterized in that, described upper and lower bridge drives interlock circuit to comprise bridge lock-in circuit and lower bridge lock-in circuit, described upper bridge lock-in circuit comprises bridge the 3rd resistance, upper bridge second transistor, one end of described upper bridge the 3rd resistance is connected with the signal output part of described lower bridge delay circuit, the other end of described upper bridge the 3rd resistance is connected with the base stage of described upper bridge second transistor, the collector electrode of described upper bridge second transistor is connected with the signal input part of described first optical transmitting set, the grounded emitter of described upper bridge transistor,
Described lower bridge lock-in circuit comprises lower bridge the 3rd resistance, lower bridge second transistor, one end of described lower bridge the 3rd resistance is connected with the signal output part of described lower bridge delay circuit, the other end of described lower bridge the 3rd resistance is connected with the base stage of described lower bridge second transistor, the collector electrode of described lower bridge second transistor is connected with the signal input part of described first optical transmitting set, the grounded emitter of described lower bridge transistor.
6. according to the described fiber-optic signal change-over circuit driven for 3300V high-power IGBT arbitrary in claim 1-5, it is characterized in that, also comprise bridge fiber-optic signal change-over circuit on second, second time bridge fiber-optic signal change-over circuit and about the second bridge be arranged on second between bridge fiber-optic signal change-over circuit and second time bridge fiber-optic signal change-over circuit drive interlock circuit, and bridge fiber-optic signal change-over circuit on the 3rd, 3rd time bridge fiber-optic signal change-over circuit and about the 3rd bridge be arranged on the described 3rd between bridge fiber-optic signal change-over circuit and the 3rd time bridge fiber-optic signal change-over circuit drive interlock circuit.
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