CN212845737U - Low-cost IGBT short circuit detection circuit - Google Patents
Low-cost IGBT short circuit detection circuit Download PDFInfo
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- CN212845737U CN212845737U CN202021430495.9U CN202021430495U CN212845737U CN 212845737 U CN212845737 U CN 212845737U CN 202021430495 U CN202021430495 U CN 202021430495U CN 212845737 U CN212845737 U CN 212845737U
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Abstract
The utility model relates to a frequency conversion or servo driver technical field, specifically be a low-cost IGBT short circuit detection circuitry, a structure is simple, and is low in cost, fast recovery diode D1's negative pole is connected to IGBT's collecting electrode, fast recovery diode D1's anodal connecting resistance R1 one end, resistance R1 other end connecting resistance R3 one end, electric capacity C1 one end, diode D2's negative pole, diode D4's negative pole, resistance R4 one end, diode D2's anodal connecting resistance R2 one end, the driving voltage is imported to the resistance R2 other end and the resistance R4 other end, electric capacity C2 one end is connected to the resistance R3 other end, zener diode D3's negative pole, 5V power is connected to the resistance R5 other end, diode D4's positive pole, the electric capacity C1 other end, the electric capacity C2 other end, the resistance R6 other end, the electric capacity C3 other end, 3 feet and the 5 feet of opto-.
Description
Technical Field
The utility model relates to a frequency conversion or servo driver technical field specifically are a low-cost IGBT short circuit detection circuitry.
Background
In a control system controlled by a frequency converter or servo-driven, various protection circuits are usually arranged for ensuring the reliable operation of the IGBT, such as overload protection, over-temperature protection, over-current protection, load detection short-circuit protection and the like, wherein short-circuit detection is an important part, which can ensure that the IGBT can normally work without being damaged.
Disclosure of Invention
For having solved current short circuit detection circuitry structure complicacy, problem with high costs, the utility model provides a low-cost IGBT short circuit detection circuitry, its simple structure, it is with low costs.
The technical scheme is as follows: the low-cost IGBT short-circuit detection circuit comprises an IGBT, and is characterized in that a collector of the IGBT is connected with a negative electrode of a fast recovery diode D1, an anode of a fast recovery diode D1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R3, one end of a capacitor C1, a negative electrode of a diode D2, a negative electrode of a diode D4 and one end of a resistor R4, an anode of the diode D2 is connected with one end of a resistor R2, the other end of the resistor R2 and the other end of the resistor R4 input driving voltage, the other end of the resistor R3 is connected with one end of a capacitor C2 and a negative electrode of a zener diode D3, an anode of the zener diode D3 is connected with one end of a resistor R2, one end of a capacitor C3 and a pin 2 of an optocoupler U1, a pin 6 of the optocoupler U1 is connected with one end of a resistor R5 and serves as a fault indication end, the other end, The other end of the capacitor C2, the other end of the resistor R6, the other end of the capacitor C3, the 3 pins and the 5 pins of the optocoupler U1 and the emitter of the IGBT are all grounded.
After the utility model is adopted, the IGBT saturation voltage drop detection is realized through the fast recovery diode D1, when the IGBT is turned off, the fast recovery diode D1 is reversely cut to realize high voltage isolation, and when the IGBT is turned on, the fast recovery diode D1 is turned on to realize the saturation voltage drop detection; the detection end and the control end are electrically isolated through the optocoupler U1, when the IGBT is detected to be in short circuit fault, the primary side of the optocoupler U1 is conducted, and the control end is informed to turn off the IGBT; the detection sensitivity is set through a voltage stabilizing diode D3, and the detection quasi-position is controlled; different charging and discharging loops are controlled through the diodes, short circuit detection interruption and fault signal keeping are achieved, the circuit structure is simple, and cost is low.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
Referring to fig. 1, a low-cost IGBT short-circuit detection circuit includes an IGBT, a collector of the IGBT is connected to a cathode of a fast recovery diode D1, an anode of the fast recovery diode D1 is connected to one end of a resistor R1, the other end of a resistor R1 is connected to one end of a resistor R3, one end of a capacitor C1, a cathode of a diode D2, a cathode of a diode D4, one end of a resistor R4, an anode of a diode D2 is connected to one end of a resistor R2, the other end of the resistor R2 and the other end of a resistor R4 input a driving voltage, i.e., a driver end, the other end of a resistor R3 is connected to one end of a capacitor C2 and a cathode of a zener diode D3, an anode of a zener diode D3 is connected to one end of a resistor R6, one end of a capacitor C3 and a pin 2 of an optocoupler U36 1, a pin 6 of an optocoupler U1 is connected to one end of a resistor R5 and is a Fault indication end, i.e., the other end of the resistor R6, the other end of the capacitor C3, the 3 pins and the 5 pins of the optocoupler U1 and the emitter of the IGBT are all grounded. Wherein the signal of the optical coupler U1 is 6N 135.
The working principle is as follows:
when the IGBT is in an off state, namely the level of a Driver end is in a-10V state, the primary side (namely the side where the 3 pin and the 2 pin are located) of the optical coupler U1 is reversely biased, and a bias path (current trend) is GND → the primary side of the optical coupler U1 → the voltage stabilizing diode D3 → the resistor R3 → the resistor R4 → the Driver end; in addition, GND → diode D4 → resistor R4 → Driver parallel loop provides the noise current channel.
When the IGBT is conducted, the Driver end voltage is changed from-10V to +15V, the capacitor C1 end voltage starts to be charged from-10V, and the charging loop is provided with a resistor R2 and a diode D2 series loop, a resistor R4 loop, a capacitor C1 and a capacitor C2 end voltage are approximately equal. The charging time before the breakdown of the voltage stabilizing diode D3 is the breaking time of short-circuit protection, and is used for offsetting the IGBT conducting delay.
If the IGBT is turned on before the zener diode D3 breaks down, the current passes through the resistor R2 → the diode D2 → the resistor R1 → the fast recovery diode D1 → the IGBT → GND, the voltage of the capacitor C1 is clamped at a specific voltage (Von + Vd1 + VR 1) of the IGBT, where Von is the IGBT saturation voltage drop, Vd1 is the forward voltage drop of the fast recovery diode D1, and VR1 is the voltage drop of the current leaving resistor R1; the resistor R3 and the capacitor C2 form a low-pass filter, one function is to filter out detection noise, and in addition, the desaturation detection slope can be controlled.
If the IGBT were to short before the zener diode D3 broke down, the short would be divided into two cases:
case 1: before the voltage stabilizing diode D3 breaks down, the IGBT does not enter a saturated conduction state, when short-circuit inductance is small, the state can occur, at the moment, because the collector voltage of the IGBT which does not enter the saturated state is very high, the fast recovery diode D1 is reversely biased, and the voltage of the capacitor C1 is determined only by RC charge and discharge, under the condition, after the interruption time, the optocoupler U1 is conducted on the primary side to indicate the Fault of the SC _ Fault end;
case 2: before the zener diode D3 breaks down, the IGBT enters a saturated conduction state, when the short-circuit inductance is large, such a state occurs, at this time, because the IGBT enters the saturated conduction state, the voltage of the capacitor C1 is clamped at a specific voltage (Von + Vd1 + VR 1), when the short-circuit current continues to increase, and when the IGBT starts to desaturate, the voltage at the capacitor C1 starts to rise, when the fast recovery diode D1 starts to reverse bias, the IGBT is in a desaturation state, at this time, the Driver charges the capacitor C1, and at the same time, the resistor R3 and the capacitor C2 form an RC filter to provide desaturation detection delay, when the IGBT finishes fully desaturation, the zener diode D3 breaks down and conducts, the primary side of the optocoupler U1 conducts, and indicates an SC _ Fault.
When the IGBT is turned off, the Driver terminal voltage changes from +15V to-10V, the fast recovery diode D1 turns off in the reverse direction, and during the process that the fast recovery diode D1 turns on from the forward direction to the reverse direction, a reverse recovery current flows through, the reverse recovery current charges the capacitor C1, which may cause a circuit malfunction, so that the resistor R6 and the capacitor C3 are arranged to provide a reverse recovery current energy release loop, when the zener diode D3 is turned on due to reverse recovery, the capacitor R6 first provides a bias current, and at the same time, the resistor R3 and the capacitor C3 form an RC charge loop, and extra energy is absorbed by the capacitor C3 and finally released through the resistor R6.
Claims (1)
1. A low-cost IGBT short-circuit detection circuit comprises an IGBT, and is characterized in that a collector of the IGBT is connected with a negative electrode of a fast recovery diode D1, a positive electrode of the fast recovery diode D1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R3, one end of a capacitor C1, a negative electrode of a diode D2, a negative electrode of a diode D4 and one end of a resistor R4, an anode of the diode D2 is connected with one end of a resistor R2, the other end of the resistor R2 and the other end of the resistor R4 are used for inputting driving voltage, the other end of the resistor R3 is connected with one end of a capacitor C2 and a negative electrode of a zener diode D3, an anode of the zener diode D3 is connected with one end of a resistor R6, one end of a capacitor C3 and a 2-pin of an optocoupler U1, a 6-pin of the U1 is connected with one end of a resistor R5, The other end of the capacitor C1, the other end of the capacitor C2, the other end of the resistor R6, the other end of the capacitor C3, the 3 pins and the 5 pins of the optocoupler U1 and the emitter of the IGBT are all grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021430495.9U CN212845737U (en) | 2020-07-20 | 2020-07-20 | Low-cost IGBT short circuit detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021430495.9U CN212845737U (en) | 2020-07-20 | 2020-07-20 | Low-cost IGBT short circuit detection circuit |
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| CN212845737U true CN212845737U (en) | 2021-03-30 |
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| CN202021430495.9U Active CN212845737U (en) | 2020-07-20 | 2020-07-20 | Low-cost IGBT short circuit detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113556119A (en) * | 2021-09-18 | 2021-10-26 | 成都万创科技股份有限公司 | Mis-connection prevention switchable isolated digital input circuit |
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2020
- 2020-07-20 CN CN202021430495.9U patent/CN212845737U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113556119A (en) * | 2021-09-18 | 2021-10-26 | 成都万创科技股份有限公司 | Mis-connection prevention switchable isolated digital input circuit |
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