CN111463755A - PFC overvoltage protection circuit and PFC circuit - Google Patents
PFC overvoltage protection circuit and PFC circuit Download PDFInfo
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- CN111463755A CN111463755A CN202010240419.XA CN202010240419A CN111463755A CN 111463755 A CN111463755 A CN 111463755A CN 202010240419 A CN202010240419 A CN 202010240419A CN 111463755 A CN111463755 A CN 111463755A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
- H02H7/205—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
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Abstract
The invention discloses a PFC overvoltage protection circuit and a PFC circuit. The PFC overvoltage protection circuit comprises a detection unit and a protection unit, wherein the detection unit is connected with the protection unit, and the protection unit is respectively used for connecting an IGBT grid and an IPM target input pin; the detection unit is used for detecting the voltage of the direct current bus and transmitting the voltage to the protection unit; the protection unit is used for outputting a first level to the IGBT grid electrode when the voltage is larger than a preset first threshold value so as to close the IGBT; and when the voltage is greater than a preset second threshold value, outputting a second level to the IPM target input pin so as to close the IPM. Therefore, when the voltage of the direct current bus (PFC voltage) is abnormal, the detection unit and the protection unit are in action, so that the IGBT or the IPM is directly closed, the calculation of the MCU or other transmission circuits is not needed, and the IGBT or the IPM and related circuits are quickly and timely protected from being damaged.
Description
Technical Field
The invention relates to the technical field of overvoltage protection circuits, in particular to a PFC overvoltage protection circuit and a PFC circuit.
Background
In the air conditioner controller, especially the controller of the outdoor unit, since the installation environment of the outdoor unit of the air conditioner is complicated, the problem of surge current is prominent, and the like, a higher demand is put on the reliability of the control panel.
At present, a commonly used traditional PFC overvoltage protection circuit adopts a voltage division circuit to send a signal to an MCU chip for detection, and when the value is larger than a certain value, the MCU switches off an IGBT or an IPM or switches off the IGBT or the IPM or the like so as to protect related circuits from failure and damage. However, the conventional PFC overvoltage protection scheme adopts a software method, and since the software method needs to calculate the delay and the action time, the IGBT or IPM can bear the overcurrent/overvoltage at the microsecond level, and the protection is not timely and easily causes the IGBT or IPM to fail due to slow turn-off.
Disclosure of Invention
The invention aims to provide a PFC overvoltage protection circuit and a PFC circuit, which can solve the problem that when PFC overvoltage occurs, an IGBT or IPM fails due to slow turn-off caused by untimely protection.
The PFC overvoltage protection circuit provided by the embodiment of the invention comprises a detection unit and a protection unit, wherein the detection unit is connected with the protection unit, and the protection unit is respectively used for connecting an IGBT grid and an IPM target input pin;
the detection unit is used for detecting the voltage of the direct current bus and transmitting the voltage to the protection unit; the protection unit is used for outputting a first level to the IGBT grid electrode when the voltage is larger than a preset first threshold value so as to close the IGBT; and when the voltage is greater than a preset second threshold value, outputting a second level to the IPM target input pin so as to close the IPM.
In one embodiment, the protection unit comprises a comparator;
the inverting input end of the comparator is connected with the output end of the detection unit;
the non-inverting input end of the comparator is used for being connected with a power supply;
and the output end of the comparator is used for being connected with the IGBT grid electrode.
In one embodiment, the protection unit comprises a comparator;
the inverting input end of the comparator is connected with the output end of the detection unit;
the non-inverting input end of the comparator is used for being connected with a power supply;
the output end of the comparator is used for being connected with an IGBT driving circuit, and the IGBT driving circuit is connected with the IGBT grid electrode.
In one embodiment, the protection unit further comprises a one-way conduction switch;
the input end of the one-way conduction switch is connected with the output end of the comparator;
and the output end of the unidirectional conducting switch is used for being connected with the IGBT grid or the IGBT driving circuit.
In one embodiment, the unidirectional conducting switch comprises a diode;
the anode of the diode is the input end of the unidirectional conducting switch;
and the cathode of the diode is the output end of the one-way conduction switch.
In one embodiment, the unidirectional conducting switch further comprises a transistor;
the base electrode of the transistor is connected with the output end of the detection unit;
the collector of the transistor is used for being connected with a power supply;
and the emitter of the transistor is used for being connected with the IGBT grid or the IGBT driving circuit.
In one embodiment, the detection unit comprises a voltage division subunit and a filtering subunit, and the voltage division subunit is connected with the filtering subunit;
the voltage division subunit is used for dividing the voltage of the direct current bus;
the filtering subunit is used for filtering the direct-current bus voltage.
In one embodiment, the detection unit further includes a detection protection subunit, and the detection protection subunit is respectively connected to the voltage dividing subunit and the filtering subunit, and is configured to perform overvoltage protection on the voltage dividing subunit and the filtering subunit.
In one embodiment, the voltage divider subunit includes a resistor series branch formed by connecting N resistors in series, a first end of the resistor series branch serves as an input end of the voltage divider subunit, and a second end of the resistor series branch serves as an output end of the voltage divider subunit; n is greater than or equal to 1;
the detection protection subunit is connected with at least one resistor in parallel.
The PFC circuit provided by the embodiment of the invention comprises an IGBT, an IPM and the PFC overvoltage protection circuit in any embodiment;
the PFC overvoltage protection circuit comprises a detection unit and a protection unit, wherein the detection unit is connected with the protection unit, and the protection unit is respectively used for connecting an IGBT grid and an IPM target input pin.
In the PFC overvoltage protection circuit of this embodiment, when the dc bus voltage (PFC voltage) is abnormal, the detection unit and the protection unit function, so as to directly turn off the IGBT or the IPM, without going through MCU calculation or other transmission circuits, and quickly and timely protect the IGBT or the IPM and related circuits from being damaged.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a PFC overvoltage protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a PFC overvoltage protection circuit and a PFC circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a detection unit and a protection unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a detection unit and a protection unit according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a PFC overvoltage protection circuit according to an embodiment of the present invention connected to an IPM.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the invention provides a PFC overvoltage protection circuit 10. The PFC overvoltage protection circuit 10 includes a detection unit 11 and a protection unit 12. The detection unit 11 is connected with the protection unit 12, and the protection unit 12 is respectively used for connecting the gate of the IGBT and the IPM target input pin.
The detecting unit 11 is used for detecting the dc bus voltage and transmitting the voltage to the protection unit 12. The protection unit 12 is configured to output a first level to the gate of the IGBT when the voltage is greater than a preset first threshold a, so that the IGBT is turned off; and when the voltage is greater than a preset second threshold value B, outputting a second level to the IPM target input pin so as to close the IPM.
Referring to fig. 2, the detecting unit 11 is connected to the electrolytic capacitor C1 of the PFC to detect the dc bus voltage and transmit the voltage to the protection unit 12.
When the dc bus voltage detected by the detection unit 11 is greater than the preset first threshold a, the protection unit 12 directly outputs the first level, and the output first level is directly transmitted to the gate of the IGBT, at this time, the gate voltage Ug of the IGBT is pulled low, and the IGBT is not turned on, thereby turning off the IGBT. In another embodiment, the first level of the output can also be directly transmitted to the input side of the driving circuit (e.g., IGBT driving chip) of the IGBT, thereby turning off the IGBT. In one embodiment, the first level is 0V.
When the dc bus voltage detected by the detection unit 11 is greater than the preset second threshold B, the protection unit 12 directly outputs the second level, and the output second level is directly connected to the IPM target input pin, so as to turn off the IPM. In one embodiment, the target input pin of the IPM is an overcurrent protection input pin (CIN pin) of the IPM, and since this pin is generally active at 0.45V or 0.48V, when the CIN pin inputs a second level (e.g., higher than 0.45V or 0.48V), the IPM may be directly turned off. In one embodiment, the second level is 0.5V.
In summary, in the PFC overvoltage protection circuit 10 of the embodiment, when the dc bus voltage (PFC voltage) is abnormal, the detection unit 11 and the protection unit 12 function to directly turn off the IGBT or the IPM, and the IGBT or the IPM and related circuits are quickly and timely protected from being damaged without MCU calculation or other transmission circuits.
In this embodiment, the first threshold a and the second threshold B may be the same, so as to turn off the IGBT and the IPM simultaneously, thereby protecting the IGBT or the IPM and the related circuit from being damaged quickly and timely.
Of course, in other embodiments, the first threshold a and the second threshold B may be different, such that the IGBT and IPM turn off asynchronously.
For example, when the dc bus voltage detected by the detection unit 11 is greater than a preset first threshold a, the IGBT is turned off first, and then when the dc bus voltage detected by the detection unit 11 is greater than a preset second threshold B, the IPM is turned off.
Referring to fig. 2, in one embodiment, the detecting unit 11 is further configured to be connected to an MCU, and the MCU determines whether the voltage is over-voltage according to the detected value. And when the detected direct current bus voltage is greater than a preset first threshold value A, the MCU sends a signal to close the IGBT. And when the detected voltage of the direct current bus is greater than a preset second threshold value B, the MCU sends a signal to close the IPM. Therefore, the IGBT and the IPM are guaranteed to be closed by software and hardware.
Referring to fig. 3, in one embodiment, the protection unit 12 includes a comparator. The inverting input terminal of the comparator is connected to the output terminal (AD _ VDC terminal) of the detection unit 11, the non-inverting input terminal of the comparator is used for connecting to a power supply, and the output terminal of the comparator is used for connecting to the IGBT gate.
The values of the non-inverting input terminal (3 pins as shown in fig. 3) and the inverting input terminal (2 pins as shown in fig. 3) of the comparator are compared, and if the value of the non-inverting input terminal 3 pin is larger, the output terminal (1 pin as shown in fig. 3) outputs a high level, and if the value of the inverting input terminal (2 pin) is larger, the output terminal (1 pin) outputs a low level. In one embodiment, the high level of the comparator output is 15V and the low level of the comparator output is 0V.
When the voltage of the dc bus is normal, that is, the voltage is less than or equal to the preset first threshold a, the detecting unit 11 outputs a low level, and the inverting input terminal of the comparator receives the low level. Because the numerical value of the non-inverting input end is larger than that of the inverting input end, the output end of the comparator outputs high level, the high level is input to the grid of the IGBT, and the IGBT cannot be turned off.
When the dc bus voltage is too high, that is, the voltage is greater than the preset first threshold a, the detection unit 11 outputs a high level, and the inverting input terminal of the comparator receives the high level. Because the value of the non-inverting input end is smaller than the value of the inverting input end, the output end of the comparator outputs a first level, and the first level is input to the grid electrode of the IGBT, so that the IGBT is closed, and the IGBT is protected.
In a certain embodiment, the protection unit 12 comprises a comparator. The inverting input end of the comparator is connected with the output end of the detection unit 11, the non-inverting input end of the comparator is used for being connected with a power supply, the output end of the comparator is used for being connected with an IGBT driving circuit, and the IGBT driving circuit is connected with an IGBT grid electrode.
When the voltage of the dc bus is normal, that is, the voltage is less than or equal to the preset first threshold a, the detecting unit 11 outputs a low level, and the inverting input terminal of the comparator receives the low level. Because the numerical value of the non-inverting input end is greater than the numerical value of the inverting input end, the output end of the comparator outputs a high level, the high level is input to the input end of the IGBT driving circuit, the IGBT driving circuit outputs the high level to the grid electrode of the IGBT, and the IGBT cannot be turned off.
When the dc bus voltage is too high, that is, the voltage is greater than the preset first threshold a, the detecting unit 11 outputs a high level, and the inverting input terminal of the comparator receives the high level. Because the value of the non-inverting input end is smaller than the value of the inverting input end, the output end of the comparator outputs a first level, the first level is input to the input end of the IGBT driving circuit, and the IGBT driving circuit outputs a low level to the grid electrode of the IGBT, so that the IGBT is turned off, and the IGBT is protected.
Referring to fig. 3, in one embodiment, the protection unit 12 further includes a one-way conducting switch 122. The input end of the unidirectional conducting switch 122 is connected with the output end of the comparator, and the output end of the unidirectional conducting switch 122 is used for being connected with an IGBT grid or an IGBT driving circuit.
The unidirectional conducting switch 122 has a unidirectional conducting function.
When the dc bus voltage is normal, the value of the non-inverting input terminal of the comparator is greater than the value of the inverting input terminal, so that the output terminal of the comparator outputs a high level, the value of the input terminal of the unidirectional conducting switch 122 is greater than the value of the output terminal thereof, and the unidirectional conducting switch 122 is turned on. At this time, the unidirectional conducting switch 122 outputs a high level to the gate of the IGBT or the input terminal of the IGBT driving circuit, and does not turn off the IGBT or turn off the IGBT through the IGBT driving circuit.
When the dc bus voltage is too high, the value of the non-inverting input terminal of the comparator is smaller than the value of the inverting input terminal, so the output terminal of the comparator outputs a low level, the value of the input terminal of the unidirectional conducting switch 122 is smaller than the value of the output terminal thereof, and the unidirectional conducting switch 122 is not conducting. At this time, the unidirectional conducting switch 122 outputs the first level to the gate of the IGBT or the input terminal of the IGBT driving circuit, so that the IGBT is directly turned off or turned off through the IGBT driving circuit, thereby protecting the IGBT.
With continued reference to fig. 3, in one embodiment, the unidirectional conducting switch 122 includes a diode D1. The anode of the diode D1 is the input terminal of the unidirectional conducting switch 122, and the cathode of the diode D1 is the output terminal of the unidirectional conducting switch 122.
When the direct current bus voltage is normal, the output end of the comparator outputs a high level, the diode D1 is conducted in the forward direction, the high level is output to the IGBT grid or the input end of the IGBT driving circuit, and the IGBT cannot be turned off or turned off through the IGBT driving circuit.
When the voltage of the direct-current bus is too high, the output end of the comparator outputs a low level, the diode D1 is cut off in a reverse direction, and the first level is output to the grid electrode of the IGBT or the input end of the IGBT driving circuit, so that the IGBT is directly closed or closed through the IGBT driving circuit, and the IGBT is protected.
In one embodiment, the output terminal of the diode D1 is also connected to the MCU.
Referring to fig. 2 and fig. 3, the high level of the comparator output is 5V or 15V, and the low level of the comparator output is 0V. When the voltage of the direct current bus is normal, the value of the 3 pin of the comparator is larger than the value of the 2 pin, namely 5V or 15V is output by the 1 pin, at the moment, the 1 pin is connected to the end of PFC-FO1 through a diode D1, the end of PFC-FO1 is connected to the IGBT driving circuit of the PFC, the end of PFC-FO1 is simultaneously connected to the MCU, and the MCU outputs a PWM signal to the end of PFC-FO 1. Due to the unidirectional conduction of the diode D1, the K terminal of the diode D1 is 5V or 15V, and the A terminal of the diode D1 is PWM (change of 0 to 5V or 0 to 15V), so that the two signals do not influence each other, and the machine operates normally.
When the voltage of the direct current bus is too high, the value of the 3 pin of the comparator is smaller than the value of the 2 pin, namely 0V is output by the 1 pin, at the moment, the 1 pin is connected to the PFC-FO1 end through a diode D1, the PFC-FO1 end is connected to the IGBT driving circuit of the PFC, the PFC-FO1 end is simultaneously connected to the MCU, and the MCU outputs a PWM signal to the PFC-FO1 end. Due to the unidirectional conduction of the diode D1, the terminal K of the diode D1 is 0V, and the terminal a of the diode D1 is PWM (0 to 5V or 0 to 15V), so that the actual signal at the terminal a is only 0V, that is, the signal received by the IGBT driving circuit N201 of the PFC is 0V, that is, the IGBT does not operate, and the IGBT is protected.
Referring to fig. 4, in one embodiment, the switch 122 further includes a transistor Q1. The base of the transistor Q1 is connected to the output of the detection unit 11, the collector of the transistor Q1 is used for connection to the power supply, and the emitter of the transistor Q1 is used for connection to the IGBT gate or IGBT driver circuit.
The base of the transistor Q1 is the controlled terminal, the collector of the transistor Q1 is the first controlled switch terminal, and the emitter of the transistor Q1 is the second controlled switch terminal. When the controlled terminal inputs a high level, the first controlled switch terminal and the second controlled switch terminal are conducted. When the controlled terminal inputs a low level, the first controlled switch terminal and the second controlled switch terminal are not conducted.
In fig. 4, the transistor Q1 is an NPN transistor for example, and the operation principle of the unidirectional conducting switch 122 is explained. It should be noted that the NPN transistor is not limited to the unidirectional conducting switch 122, and may be adjusted according to the type of the transistor Q1.
When the direct current bus voltage is normal, the output end of the comparator outputs a high level, the transistor Q1 is turned on after receiving the high level, and therefore the high level is output to the gate of the IGBT or the input end of the IGBT driving circuit, and the IGBT is not turned off or is turned off through the IGBT driving circuit.
When the voltage of the direct-current bus is too high, the output end of the comparator outputs a low level, the transistor Q1 is cut off after receiving the low level, and a first level is output to the grid electrode of the IGBT or the input end of the IGBT driving circuit, so that the IGBT is directly closed or closed through the IGBT driving circuit, and the IGBT is protected.
Referring to fig. 3, in one embodiment, the detecting unit 11 includes a voltage dividing subunit 111 and a filtering subunit 112, and the voltage dividing subunit 111 is connected to the filtering subunit 112. The voltage divider 111 is used for dividing the dc bus voltage, and the filter subunit 112 is used for filtering the dc bus voltage.
Referring to fig. 2, an input terminal (VDC +) of the voltage divider 111 is connected to a large electrolytic capacitor C1 of the PFC, a dc bus voltage is divided by the voltage divider 111, and the divided voltage is connected to an input terminal of the protection unit 12 through an output terminal (AD _ VDC terminal) of the filtering sub-unit 112, so that the dc bus voltage of the PFC (generally, between 310V and 400V) is divided into 0V-5V, and the PFC voltage is detected in real time.
In one embodiment, the output terminal (AD _ VDC terminal) of the filtering subunit 112 may also be directly connected to the MCU. Therefore, after the electrolytic direct current voltage of the PFC is subjected to voltage division to be 0V-5V, the MCU can conveniently detect the PFC voltage in real time. If the PFC voltage is too high (for example 410V), the MCU controls the related functions to be closed again.
Referring to fig. 3, in one embodiment, the detecting unit 11 further includes a detection protection subunit 113, and the detection protection subunit 113 is respectively connected to the voltage dividing subunit 111 and the filtering subunit 112, and is configured to perform overvoltage protection on the voltage dividing subunit 111 and the filtering subunit 112.
If the dc bus voltage is too high, the detection unit 11 is damaged. By providing the detection protection subunit 113, the voltage dividing subunit 111 and the filtering subunit 112 can be protected from overvoltage.
Referring to fig. 3, in one embodiment, the voltage divider subunit 111 includes a resistor series branch formed by connecting N resistors in series, a first end of the resistor series branch serves as an input end of the voltage divider subunit 111, and a second end of the resistor series branch serves as an output end of the voltage divider subunit 111. N is greater than or equal to 1. The detection protection subunit 113 is connected in parallel with at least one resistor.
The resistance value of each of the N resistors is set according to specific requirements, wherein the resistance value of each resistor may be the same or different.
Referring to fig. 2, in the present embodiment, the first end (VDC +) of the resistor series branch is connected to a large electrolytic capacitor C1 of the PFC, the voltage is divided by the resistor series branch, and the divided voltage passes through the AD _ VDC end of the filtering sub-unit 112 and then is connected to the input end of the protection unit 12, so as to detect the voltage of the PFC in real time and transmit the voltage.
Referring to fig. 2 and 3, in one embodiment, the first terminal (VDC +) of the resistor series is connected to a large electrolytic capacitor C1 of the PFC, and the voltage detected by R345 is connected to the inverting input terminal (e.g., pin 2 shown in fig. 3) of the comparator after RC filtering (R346 and C328) through a voltage divider circuit of the resistor series (e.g., R343/R342/R341/R345 shown in fig. 3). The output terminal (1 pin) of the comparator outputs a low level. When the voltage of the direct-current bus is abnormal, the diode D1 is cut off in the reverse direction, and a first level is output to the IGBT grid or the input end of the IGBT driving circuit, so that the IGBT is directly closed or closed through the IGBT driving circuit, and the IGBT and related circuits are quickly and timely protected from being damaged.
Referring to fig. 2 and 5, in one embodiment, the first terminal (VDC +) of the resistor series is connected to the large electrolytic capacitor C1 of the PFC, and the voltage detected by R445 is filtered by RC (R446 and C428) and then directly applied to the target input pin (CIN terminal) of the IPM through the voltage divider circuit of the resistor series (R443/R442/R441/R445 shown in fig. 5). For the CIN end, under the normal condition, the value of the CIN end is lower than 0.48V or 0.45V, and IPM works; when the voltage of the PFC is abnormal, the value of the CIN end is larger than 0.48V or 0.45V, such as 0.5V, the IPM is self-locked, namely the IPM does not work, and therefore the IPM and related circuits are protected from being damaged quickly and timely.
In one embodiment, the detection protection subunit 113 includes a TVS (transient suppression diode D1) or an ESD (electrostatic protection element) or a diode D1.
Referring to fig. 2, an embodiment of the invention provides a PFC circuit 100, which includes an IGBT, an IPM, and a PFC overvoltage protection circuit 10 according to any of the above embodiments. The PFC overvoltage protection circuit 10 includes a detection unit 11 and a protection unit 12, the detection unit 11 is connected to the protection unit 12, and the protection unit 12 is respectively used for connecting an IGBT gate and an IPM target input pin.
The PFC circuit in this embodiment may be applied to an outdoor unit of an air conditioner, or an appliance of a washing machine or a refrigerator using the PFC circuit.
In summary, in the PFC circuit 100 of the embodiment, when the dc bus voltage (PFC voltage) is abnormal, the detection unit 11 and the protection unit 12 of the PFC overvoltage protection circuit 10 function, so as to directly turn off the IGBT or the IPM, and quickly and timely protect the IGBT or the IPM and related circuits from being damaged without MCU calculation or other transmission circuits.
The above is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several modifications and refinements without departing from the principle of the present invention, such as the modification of the PFC overvoltage protection circuit or the PFC circuit, and these modifications and refinements are also considered as the protection scope of the present invention.
Claims (10)
1. The PFC overvoltage protection circuit is characterized by comprising a detection unit and a protection unit, wherein the detection unit is connected with the protection unit, and the protection unit is respectively used for connecting an IGBT grid and an IPM target input pin;
the detection unit is used for detecting the voltage of the direct current bus and transmitting the voltage to the protection unit;
the protection unit is used for outputting a first level to the IGBT grid electrode when the voltage is larger than a preset first threshold value so as to close the IGBT; and when the voltage is greater than a preset second threshold value, outputting a second level to the IPM target input pin so as to close the IPM.
2. The PFC overvoltage protection circuit of claim 1, wherein the protection unit comprises a comparator;
the inverting input end of the comparator is connected with the output end of the detection unit;
the non-inverting input end of the comparator is used for being connected with a power supply;
and the output end of the comparator is used for being connected with the IGBT grid electrode.
3. The PFC overvoltage protection circuit of claim 1, wherein the protection unit comprises a comparator;
the inverting input end of the comparator is connected with the output end of the detection unit;
the non-inverting input end of the comparator is used for being connected with a power supply;
the output end of the comparator is used for being connected with an IGBT driving circuit, and the IGBT driving circuit is connected with the IGBT grid electrode.
4. The PFC overvoltage protection circuit of claim 2 or 3, wherein the protection unit further comprises a unidirectional conducting switch;
the input end of the one-way conduction switch is connected with the output end of the comparator;
and the output end of the unidirectional conducting switch is used for being connected with the IGBT grid or the IGBT driving circuit.
5. The PFC overvoltage protection circuit of claim 4, wherein the unidirectional conducting switch comprises a diode;
the anode of the diode is the input end of the unidirectional conducting switch;
and the cathode of the diode is the output end of the one-way conduction switch.
6. The PFC overvoltage protection circuit of claim 4, wherein the unidirectional conducting switch further comprises a transistor;
the base electrode of the transistor is connected with the output end of the detection unit;
the collector of the transistor is used for being connected with a power supply;
and the emitter of the transistor is used for being connected with the IGBT grid or the IGBT driving circuit.
7. The PFC overvoltage protection circuit of claim 1, wherein the detection unit comprises a voltage divider subunit and a filter subunit, the voltage divider subunit being connected to the filter subunit;
the voltage division subunit is used for dividing the voltage of the direct current bus;
the filtering subunit is used for filtering the direct-current bus voltage.
8. The PFC overvoltage protection circuit of claim 7, wherein the detection unit further comprises a detection protection subunit, and the detection protection subunit is respectively connected with the voltage dividing subunit and the filtering subunit and is configured to perform overvoltage protection on the voltage dividing subunit and the filtering subunit.
9. The PFC overvoltage protection circuit of claim 8, wherein the voltage-dividing sub-unit comprises a resistor series branch formed by connecting N resistors in series, a first end of the resistor series branch serves as an input end of the voltage-dividing sub-unit, and a second end of the resistor series branch serves as an output end of the voltage-dividing sub-unit; n is greater than or equal to 1;
the detection protection subunit is connected with at least one resistor in parallel.
10. A PFC circuit comprising an IGBT, an IPM and the PFC overvoltage protection circuit according to any one of claims 1 to 9;
the PFC overvoltage protection circuit comprises a detection unit and a protection unit, wherein the detection unit is connected with the protection unit, and the protection unit is respectively used for connecting an IGBT grid and an IPM target input pin.
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| CN202010240419.XA CN111463755A (en) | 2020-03-30 | 2020-03-30 | PFC overvoltage protection circuit and PFC circuit |
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| CN202010240419.XA CN111463755A (en) | 2020-03-30 | 2020-03-30 | PFC overvoltage protection circuit and PFC circuit |
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|---|---|---|---|---|
| CN114006520A (en) * | 2021-10-27 | 2022-02-01 | 广东汇芯半导体有限公司 | High-voltage integrated circuit and semiconductor circuit |
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