CN112039321A - Power-on and power-off locking protection circuit of servo driver IGBT module - Google Patents

Power-on and power-off locking protection circuit of servo driver IGBT module Download PDF

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Publication number
CN112039321A
CN112039321A CN202010672976.9A CN202010672976A CN112039321A CN 112039321 A CN112039321 A CN 112039321A CN 202010672976 A CN202010672976 A CN 202010672976A CN 112039321 A CN112039321 A CN 112039321A
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resistor
triode
igbt module
optocoupler
power
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CN112039321B (en
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林中轩
陈振宇
陈赛虎
虞乾恒
朱钜録
张晓峰
谢子方
袁世博
周兵兵
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Ningbo Anxin Cnc Technology Co ltd
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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
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection

Abstract

The invention discloses a power-on and power-off locking protection circuit of a servo driver IGBT module, which comprises an optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a first voltage stabilizing diode, a first triode, a second triode, a third triode and an MOS (metal oxide semiconductor) tube, wherein a digital signal power supply threshold value is set by the second resistor and the first voltage stabilizing diode; a comparison threshold value is set by the fifth resistor, the first capacitor and the third triode, an input signal is compared after entering, and the on-off of the optocoupler is controlled through the on-off of the third triode to protect the optocoupler, so that the error on-off of the IGBT module is effectively avoided.

Description

Power-on and power-off locking protection circuit of servo driver IGBT module
Technical Field
The invention relates to a servo driver IGBT (Insulated Gate Bipolar Transistor) module, in particular to an upper and lower electric locking protection circuit of the servo driver IGBT module.
Background
In industrial production, servo drives are used very widely. The control and protection of the IGBT module are the core technical problems of the servo driver.
In the process of moving the whole servo driver up and down, the IGBT module is easy to be switched on by mistake due to the uncertainty of the power-up and power-down time sequence. Particularly, when the servo driver is abnormal, the IGBT module is turned on by mistake, which causes short-circuit damage to the IGBT module.
The existing power-on and power-off protection mode of the IGBT module mainly controls the power-on and power-off time sequence of each power supply of the whole servo driver. One is that the power-on time sequence of each power supply of the whole servo driver is controlled by a RC (resistor-capacitor) equal delay circuit and a pull-up and pull-down resistor on a signal input end, so that the IGBT control signal and an IGBT driving optocoupler for driving an IGBT module are ensured to be powered on correctly; and the other type is that after the IGBT control signal source is ensured to be stable through a software mode, the IGBT drive optocoupler starts to be electrified to normally work.
However, with the first type of power-up and power-down protection mode, the power supply module adopted by the medium-high power servo driver has a complex structure, the power supply is in multi-path and multi-stage output, and multi-stage delay exists between the power-up of the IGBT driving optocoupler and the power supply starting, so the power-up and power-down time sequence is more severe. By adopting the two types of power-on and power-off protection forms, the overall stability of the servo driver is poor, careless leakage is easily caused, the IGBT module is mistakenly switched on, and the IGBT module is damaged by short circuit.
Disclosure of Invention
The invention aims to solve the technical problem of providing an up-and-down electric locking protection circuit of a servo driver IGBT module, which can effectively avoid the error switching-on of the IGBT module.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a servo driver IGBT module's upper and lower electricity locking protection circuit which characterized in that: the circuit comprises an optical coupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a first voltage stabilizing diode, a first triode, a second triode, a third triode and an MOS (metal oxide semiconductor) transistor, wherein a first input end of the optical coupler is connected with one end of the third resistor, the other end of the third resistor is connected with a collector of the first triode, an emitter of the first triode is respectively connected with one end of the second resistor, one end of the first resistor and an emitter of the second triode, a public connection end of the emitter is connected with a digital signal power supply, a base of the first triode is connected with the other end of the second resistor, a public connection end of the base of the first triode is connected with a cathode of the first voltage stabilizing diode, and a second input end of the optical coupler is respectively connected with the other end of the first resistor, The base electrode of the second triode is connected with the collector electrode of the third triode, the collector electrode of the second triode is respectively connected with one end of a fifth resistor, one end of a first capacitor, one end of a sixth resistor and the base electrode of the third triode, the other end of the fifth resistor is connected with the control signal input end of an IGBT module driving circuit, the other end of the first capacitor, the other end of the sixth resistor, the emitter electrode of the third triode and the anode of a first voltage stabilizing diode are all connected with a digital ground, the first output end of the optical coupler is respectively connected with one end of a fourth resistor and the grid electrode of the MOS tube, the other end of the fourth resistor is connected with the source electrode of the MOS tube, the common connection of the fourth resistor and the source electrode is connected with the driving power supply of the IGBT module driving circuit, and the second output end of the optical coupler is connected with the drain electrode of the MOS tube, and the common connection end of the IGBT module is connected with the power input end of a driving optocoupler in the IGBT module driving circuit.
The type of the optocoupler is TLP785, the 1 st pin of the optocoupler is an anode of an internal light emitting diode and serves as a first input end, the 2 nd pin of the optocoupler is a cathode of the internal light emitting diode and serves as a second input end, the 4 th pin of the optocoupler is a collector of an internal phototriode and serves as a first output end, and the 3 rd pin of the optocoupler is an emitter of the internal phototriode and serves as a second output end.
The first triode and the second triode are both PNP type triodes, the third triode is an NPN type triode, and the MOS tube is a PMOS tube.
Compared with the prior art, the invention has the advantages that:
1) the invention realizes the power-on and power-off protection of the IGBT module and the quick response of normal action by using a pure hardware circuit, and effectively avoids the occurrence of error locking in a self-locking mode without software intervention.
2) The circuit of the invention has higher stability by simultaneously controlling the input signal and the digital signal power supply.
3) In the circuit, threshold comparison is carried out on a digital signal power supply, the voltage amplitude of an input signal is detected in a threshold comparison mode, and an optical coupler is switched on or switched off for protection according to the voltage amplitude of the input signal; the digital signal power supply threshold is set by a second resistor and a first voltage stabilizing diode, if the digital signal power supply threshold is set to be 3.9V, when the digital signal power supply does not reach the digital signal power supply threshold (3.9V), a first triode is in a turn-off state; when the digital signal power supply rises to the threshold value (3.9V) of the digital signal power supply, the first voltage stabilizing diode breaks down, and the first triode is in a conducting state; the on or off of the first triode controls the on or off of the optocoupler, so that the optocoupler is protected.
In the circuit, input signals are sampled and compared, and by sampling and comparing whether the pulse width time of the input signals reaches a comparison threshold value, an optocoupler is switched on or off for protection; the comparison threshold is set by the fifth resistor, the first capacitor and the third triode, input signals are compared after entering the comparison threshold, and the on or off of the optocoupler is controlled through the on or off of the third triode to protect the optocoupler.
In the circuit, the optocoupler works only under the condition that the first triode and the third triode are simultaneously conducted, and the optocoupler does not work under the condition that the first triode or the third triode is not conducted, namely AND logic, the AND logic is transmitted to a gate pole of the MOS tube through the optocoupler, the state of the MOS tube is correspondingly changed, and the AND logic is realized by a driving power supply of the IGBT module driving circuit.
In the circuit, self-locking is realized through the fifth resistor, the first capacitor, the sixth resistor, the second triode, the first resistor and the third triode, so that a driving optocoupler in the IGBT module driving circuit always works normally no matter the high and low levels of an input signal change under the normal working condition.
The situation can effectively avoid errors of the power-on time sequence, and meanwhile, the working stability of the whole servo driver is improved, so that the IGBT module is prevented from being switched on by mistake.
4) In the circuit, the MOS tube and the optical coupler can realize quick turn-off when power is off abnormally.
Drawings
Fig. 1 is a circuit diagram of an IGBT module in which the upper and lower electric locking protection circuits of the present invention are applied to a U-phase upper bridge of a servo driver.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The invention provides a power-up and power-down locking protection circuit of a servo driver IGBT module, as shown in fig. 1, which comprises an optocoupler U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a first voltage-stabilizing diode Z1, a first triode Q1, a second triode Q2, a third triode Q3 and a MOS tube M1, wherein a first input end of the optocoupler U1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with a collector of the first triode Q1, an emitter of the first triode Q1 is respectively connected with one end of the second resistor R2, one end of the first resistor R1 and an emitter of the second triode Q2, a common terminal of the first triode Q1 is connected with a digital signal power supply, a base of the first triode Q1 is connected with the other end of the second resistor R2, and a common terminal of the first triode Q1 is connected with a cathode of the first voltage-stabilizing diode Z1, a second input end of the optocoupler U1 is respectively connected with the other end of the first resistor R1, a base of the second triode Q2 and a collector of the third triode Q3, a collector of the second triode Q2 is respectively connected with one end of a fifth resistor R5, one end of a first capacitor C1, one end of a sixth resistor R6 and a base of the third triode Q3, the other end of the fifth resistor R5 is connected with a control signal input end of the IGBT module driving circuit, the other end of the first capacitor C1, the other end of the sixth resistor R6, an emitter of the third triode Q3 and an anode of the first zener diode Z1 are all connected with a digital ground, a first output end of the optocoupler U1 is respectively connected with one end of the fourth resistor R4 and a gate of the MOS tube M1, the other end of the fourth resistor R4 is connected with a source of the MOS tube M1 and commonly connected with a driving power supply of the IGBT module driving circuit, a second drain of the optocoupler U1 is connected with a drain of the MOS tube M1, and the common connection end of the driving optical coupler is connected with the power supply input end of a driving optical coupler U2 in the IGBT module driving circuit.
In this embodiment, the model of optocoupler U1 is TLP785, the 1 st pin of optocoupler U1 is the anode of the internal light emitting diode and serves as the first input end, the 2 nd pin of optocoupler U1 is the cathode of the internal light emitting diode and serves as the second input end, the 4 th pin of optocoupler U1 is the collector of the internal phototransistor and serves as the first output end, and the 3 rd pin of optocoupler U1 is the emitter of the internal phototransistor and serves as the second output end.
In this embodiment, the first transistor Q1 and the second transistor Q2 are both PNP transistors, the third transistor Q3 is an NPN transistor, and the MOS transistor M1 is a PMOS transistor.
In the power-on process of the servo driver, if a digital signal power supply does not reach an input threshold (usually 3.9V) or an input signal PU input from a control signal input end of an IGBT module driving circuit does not generate a stable high level reaching a set pulse width, a driving optical coupler U2 in the IGBT module does not work, a driving optical coupler U2 power supply MOS tube M1 is disconnected, and a driving optical coupler U2 is locked; when the driving power supply of the IGBT module driving circuit reaches an input threshold value (generally 3.9V) and an input signal input by the control signal input end of the IGBT module driving circuit generates a stable high level reaching a set pulse width, the driving optocoupler U2 works, the upper and lower electric locking protection circuit enters a self-locking state, the driving optocoupler U2 supplies power to the MOS transistor M1 to be conducted, and the driving optocoupler U2 starts to work normally.
In the power-off process of the servo driver, under the normal condition, the driving power supply of the IGBT module driving circuit is powered off firstly, and then the digital signal power supply is powered off; if the digital signal source is powered off firstly, the driving optocoupler U2 stops working immediately, the power supply MOS tube M1 of the driving optocoupler U2 is forcibly disconnected, so that the power supply of the driving optocoupler U2 is powered off immediately, and the situation that the IGBT module is switched on by mistake is prevented.
In practical application, the upper and lower electric locking protection circuits of the invention are used for carrying out upper and lower electric locking protection on the upper and lower bridge arms of each phase of the UVW three-phase, and a U-phase upper bridge is taken as an example for explanation.
Referring to fig. 1, the IGBT module driving circuit includes a driving optocoupler U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first diode D1, a second diode D2, and a second zener diode Z2, the type of the driving optocoupler U2 is ACPL-W341, the 1 st pin of the driving optocoupler U2 is connected with one end of the second capacitor C2 and one end of the eighth resistor R8 respectively, and the common connection thereof is connected with a digital signal power source, the 3 rd pin of the driving optocoupler U2 is connected with the other end of the second capacitor C2, the other end of the eighth resistor R8 and one end of the tenth resistor R10 respectively, and the other end of the tenth resistor R10 is used as a control signal source of the IGBT module driving signal source, the 4 th pin of the driving optocoupler U2 is connected with the grid reference ground of the IGBT module, the 5 th pin of the driving optocoupler U2 is respectively connected with one end of a seventh resistor R7 and one end of a ninth resistor R9, the other end of the seventh resistor R7 is connected with the cathode of a first diode D1, the anode of the first diode D1 is respectively connected with the anode of a second diode D2, the other end of a ninth resistor R9, one end of an eleventh resistor R11 and one end of a fourth capacitor C4, the common connection end of the first diode D1 and the fourth diode D4 is connected with the grid control end of the IGBT module, the 6 th pin of the driving optocoupler U2 is a power input end and is respectively connected with the cathode of a second diode D2, one end of a third capacitor C3 and the cathode of a second zener diode Z2, the other end of the third capacitor C3 is respectively connected with the anode of the second zener diode Z2, one end of a twelfth resistor R12, one end of a fifth capacitor C5, the other end of the fourth capacitor C4 and the eleventh resistor, the other end of the fifth capacitor C5 and the other end of the twelfth resistor R12 are both connected with the grid of the IGBT module and are referenced to the ground.
During the power-on process of the servo driver, a main power supply generates a digital signal power supply +5V-VDD and a driving power supply (upper bridge) +21V + U.
As shown in fig. 1, when an input signal PU-at the control signal input end of the IGBT module driving circuit is active at a low level, that is, when the input signal PU-is at a low level, a light emitting diode inside the optocoupler U2 is driven to be turned on, and the IGBT module is driven to be turned on.
Under the condition of no power-on and power-off locking protection circuit, in the power-on process of the servo driver, when the driving power supply +21V + U is powered on firstly and the digital signal power supply +5V-VDD is powered on later, because the input signal PU-is not pulled high at the moment, a light emitting diode in the driving optocoupler U2 is turned on, and the IGBT module is turned on by mistake. In the working process of the servo driver, when the digital signal power supply +5V-VDD is unstable, the input signal PU-is also unstable, so that the working state of a light emitting diode in the driving optocoupler U2 is unstable, and the situation of mistaken turning-on of an IGBT module occurs.
After the upper and lower electric locking protection circuits are added, the situation that the two IGBT modules are switched on by mistake can be effectively avoided, and the detailed principle is as follows:
the digital signal power supply threshold is set by the second resistor R2 and the first zener diode Z1, and the threshold is set to 3.9V according to the first zener diode Z1.
When the digital signal power supply does not reach the digital signal power supply threshold (set to 3.9V), the first transistor Q1 is in an off state, which is defined as state 1.
When the digital signal power supply rises to the digital signal power supply threshold (set to 3.9V), the first zener diode Z1 breaks down, and the first transistor Q1 is in a conducting state, which is defined as state 2.
The pulse width threshold of the power-on and power-off locking protection circuit is set by a fifth resistor R5, a first capacitor C1 and a third triode Q3, and when a digital signal power supply is stable, a signal of the digital signal power supply passes through an RC charging circuit consisting of the fifth resistor R5 and the first capacitor C1, and can be known from kirchhoff's voltage law: u shapein＝i×R+UCI.e. by
Figure BDA0002583003900000061
Is adjusted to obtain
Figure BDA0002583003900000062
When U is turnedCWhen 0, the two-sided integration can be found:
Figure BDA0002583003900000063
get U in5V, R10K, C1. mu.F, when UCWhen the voltage is 0.7V, the third transistor Q3 is turned on, and t is calculated to be 1.5ms, that is, the pulse width is set to 1.5 ms. In the above formula, UinRepresenting the digital signal supply voltage, i representing the current, R representing the resistance of a fifth resistor R5, UCRepresenting the voltage across the first capacitor C1, exp () representing an exponential function with a base of the natural base e, t representing the set pulse width, and d representing the derivative.
When the input signal PU-input at the control signal input terminal of the IGBT module driving circuit is an unstable disturbance or low level, the base of the third transistor Q3 is pulled low by the sixth resistor R6 due to the fact that the set pulse width is not reached to 1.5ms, the third transistor Q3 is in an off state, and the collector of the third transistor Q3 is at a digital power level, which is defined as state 3.
When an input signal PU-input by a control signal input end of the IGBT module driving circuit is stable and reaches a high level with a set pulse width of 1.5ms, the first capacitor C1 is charged through the fifth resistor R5, and a high level is generated at the base of the third triode Q3, which causes the conduction of the third triode Q3, so that a low level is generated at the base of the second triode Q2, which causes the conduction of the second triode Q2, thereby causing the base of the third triode Q3 to be stable at the high level, and the collector of the third triode Q3 to be stable at the low level, which causes a self-locking effect, and this time is defined as state 4.
When the servo driver is powered on or works, in the state 1, the state 2, the state 3 and the state 4, under the condition that the state 2 and the state 4 are achieved at the same time, the light emitting diode in the optical coupler U2 is driven to be turned on. Because first triode Q1 is in the on-state, the collecting electrode (the 2 nd foot of opto-coupler U1) of third triode Q3 is drawn low and locking simultaneously, the inside emitting diode of opto-coupler switches on, control secondary phototriode switches on, make MOS pipe M1's grid drawn low, MOS pipe M1 switches on, drive power supply +21V + U gives the drive opto-coupler U2 power supply in the IGBT module drive circuit, drive opto-coupler U2 just can drive the IGBT module this moment. And other state combinations cannot enable the driving optocoupler U2 to drive the IGBT module.
During the power-off process of the servo driver, the main power supply turns off the digital signal power supply +5V-VDD and the driving power supply +21V + U. Under normal conditions, the driving power supply +21V + U is powered off firstly, and then the digital signal power supply +5V-VDD is powered off; if the situation that the digital signal power supply +5V-VDD powers off firstly occurs, a light emitting diode inside the optical coupler U1 stops working, a secondary phototriode is turned off, the 4 th pin of the optical coupler U1 is pulled high, the grid and source voltage of the MOS tube M1 are equal, the MOS tube M1 is turned off quickly, the driving power supply +21V + U is turned off from the driving optical coupler U2, the driving optical coupler U2 stops working, and the situation that the IGBT module is turned on mistakenly is avoided.

Claims (3)

1. The utility model provides a servo driver IGBT module's upper and lower electricity locking protection circuit which characterized in that: the circuit comprises an optical coupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a first voltage stabilizing diode, a first triode, a second triode, a third triode and an MOS (metal oxide semiconductor) transistor, wherein a first input end of the optical coupler is connected with one end of the third resistor, the other end of the third resistor is connected with a collector of the first triode, an emitter of the first triode is respectively connected with one end of the second resistor, one end of the first resistor and an emitter of the second triode, a public connection end of the emitter is connected with a digital signal power supply, a base of the first triode is connected with the other end of the second resistor, a public connection end of the base of the first triode is connected with a cathode of the first voltage stabilizing diode, and a second input end of the optical coupler is respectively connected with the other end of the first resistor, The base electrode of the second triode is connected with the collector electrode of the third triode, the collector electrode of the second triode is respectively connected with one end of a fifth resistor, one end of a first capacitor, one end of a sixth resistor and the base electrode of the third triode, the other end of the fifth resistor is connected with the control signal input end of an IGBT module driving circuit, the other end of the first capacitor, the other end of the sixth resistor, the emitter electrode of the third triode and the anode of a first voltage stabilizing diode are all connected with a digital ground, the first output end of the optical coupler is respectively connected with one end of a fourth resistor and the grid electrode of the MOS tube, the other end of the fourth resistor is connected with the source electrode of the MOS tube, the common connection of the fourth resistor and the source electrode is connected with the driving power supply of the IGBT module driving circuit, and the second output end of the optical coupler is connected with the drain electrode of the MOS tube, and the common connection end of the IGBT module is connected with the power input end of a driving optocoupler in the IGBT module driving circuit.
2. The power-on and power-off locking protection circuit of the servo driver IGBT module as claimed in claim 1, characterized in that: the type of the optocoupler is TLP785, the 1 st pin of the optocoupler is an anode of an internal light emitting diode and serves as a first input end, the 2 nd pin of the optocoupler is a cathode of the internal light emitting diode and serves as a second input end, the 4 th pin of the optocoupler is a collector of an internal phototriode and serves as a first output end, and the 3 rd pin of the optocoupler is an emitter of the internal phototriode and serves as a second output end.
3. The power-on and power-off locking protection circuit of the servo driver IGBT module as claimed in claim 1 or 2, characterized in that: the first triode and the second triode are both PNP type triodes, the third triode is an NPN type triode, and the MOS tube is a PMOS tube.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112929013A (en) * 2021-02-01 2021-06-08 四川爱创科技有限公司 Circuit for realizing power failure self-recovery memory function and control method thereof
CN112929013B (en) * 2021-02-01 2023-07-25 四川爱创科技有限公司 Circuit for realizing power-down self-recovery memory function and control method thereof

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