CN114024533A - IGBT over-current detection protection circuit, compressor and air conditioning device - Google Patents
IGBT over-current detection protection circuit, compressor and air conditioning device Download PDFInfo
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- CN114024533A CN114024533A CN202111422938.9A CN202111422938A CN114024533A CN 114024533 A CN114024533 A CN 114024533A CN 202111422938 A CN202111422938 A CN 202111422938A CN 114024533 A CN114024533 A CN 114024533A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/08116—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit in composite switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
Abstract
The invention relates to an IGBT (insulated gate bipolar transistor) overcurrent detection protection circuit, a compressor and an air conditioning device.A switch module is arranged between the output end of an IGBT inversion module and a load, and a control module controls a main control chip to stop outputting PWM (pulse width modulation) signals and controls the switch module to be disconnected from the load when the output current of the IGBT inversion module is larger than a threshold current, so that when the IGBT inversion module is in short circuit or has larger current mutation, double protection on the IGBT module is realized by switching off the IGBT and cutting off a load loop, the timeliness and effectiveness of the IGBT overcurrent detection protection are improved, and the problem of protection delay existing in the prior art when software is adopted to detect the IGBT current for overcurrent protection can be solved. Furthermore, according to the technical scheme provided by the invention, overcurrent detection and IGBT protection are integrated together, a protection circuit is built by adopting hardware, the circuit integration level is high, and the overcurrent protection is matched with the IGBT current detected by software, so that the overcurrent protection circuit is safer and more reliable.
Description
Technical Field
The invention relates to the technical field of circuit design, in particular to an IGBT (insulated gate bipolar transistor) overcurrent detection protection circuit, a compressor and an air conditioning device.
Background
With the continuous development of industrial technology, the use of the IGBT is also more and more extensive, especially in the field of motor control. In the process of using the IGBT, the overcurrent protection of the motor and the overcurrent protection of the IGBT are very important, and if the motor is not protected timely, the demagnetization of the motor or the burning of a winding can be caused; if the overcurrent protection of the IGBT is not timely, the IGBT can be burnt out, and certain danger exists.
Currently, most methods are used to detect the current flowing through the IGBT by software, and when the current reaches a certain value, corresponding protective measures are taken. However, due to the fact that certain time delay exists in the software processing, some protection is not timely, and certain danger exists.
Disclosure of Invention
In view of the above, the present invention provides an IGBT over-current detection protection circuit, a compressor, and an air conditioning apparatus, so as to solve the problem of protection delay in the prior art that software is used to detect IGBT current for over-current protection.
According to a first aspect of the embodiments of the present invention, there is provided an IGBT overcurrent detection protection circuit, including:
the switch module is arranged between the output end of the IGBT inversion module and a load; the IGBT inversion module is connected with a main control chip through a first driving circuit, and the main control chip is used for generating PWM signals;
and the control module is connected with the switch module, is simultaneously connected with the main control chip and is used for controlling the main control chip to stop outputting the PWM signal and controlling the switch module to be disconnected with the load when the output current of the IGBT inversion module is greater than the threshold current.
Preferably, the switch module includes:
at least one P-type IGBT module;
if the number of the P-type IGBT modules is multiple, the P-type IGBT modules are connected in parallel;
the drain electrode of the switch module is connected with the output end of the IGBT inversion module, the source electrode of the switch module is grounded, and the grid electrode of the switch module is connected with the control module through a second drive circuit.
Preferably, the control module includes:
the non-inverting input end of the non-inverting amplifier is connected with the drain electrode of the switch module, the inverting input end of the non-inverting amplifier is connected with the source electrode of the switch module through a first resistor, and the output end of the non-inverting amplifier is connected with the source electrode of the switch module through a second resistor and is also connected with the main control chip;
the positive phase input end of the comparator is externally connected with a reference voltage source, and the negative phase input end of the comparator is connected with the output end of the in-phase amplifier; the reference voltage output by the reference voltage source is positively correlated with the threshold current;
a first multivibrator, the input terminal of which is connected to the output terminal of the comparator, and the output terminal of which is connected to the second driving circuit;
and the input end of the second multivibrator is connected with the output end of the comparator, and the output end of the second multivibrator is connected with the main control chip.
Preferably, the comparator is configured to output a low level signal when the input voltage is greater than the reference voltage output by the reference voltage source; when the input voltage is smaller than the reference voltage output by the reference voltage source, outputting a high-level signal;
the first multivibrator is used for outputting a low level signal lasting for a first duration when the comparator outputs a low level so as to control the switch module to be disconnected from the load;
and the second multivibrator is used for outputting a low level signal lasting for a second time length when the comparator outputs a low level so as to control the main control chip to stop outputting the PWM signal.
Preferably, the first duration is less than or equal to the second duration.
Preferably, the load comprises at least one of:
motor, compressor, fan.
According to a second aspect of embodiments of the present invention, there is provided a compressor driving circuit including:
the IGBT overcurrent detection protection circuit is disclosed.
According to a third aspect of embodiments of the present invention, there is provided a compressor including:
the compressor driving circuit is described above.
According to a fourth aspect of the embodiments of the present invention, there is provided an air conditioning device including:
the compressor described above.
Preferably, the air conditioning device includes:
air conditioning, and/or a fresh air machine.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
through set up the switch module between the output of IGBT contravariant module and load to be in through control module when the output current of IGBT contravariant module is greater than threshold current, control main control chip stops output PWM signal, and control switch module disconnection and load's connection for when short circuit or great current sudden change take place for IGBT contravariant module, through turn-off IGBT and cut off load return circuit, realize the duplicate protection to the IGBT module, improved the promptness and the validity of IGBT overcurrent detection protection, can solve and adopt software to detect IGBT current among the prior art and carry out overcurrent protection, have the problem of protection delay.
Furthermore, according to the technical scheme provided by the invention, overcurrent detection and IGBT protection are integrated together, a protection circuit is built by adopting hardware, the circuit integration level is high, and the overcurrent protection is matched with the IGBT current detected by software, so that the overcurrent protection circuit is safer and more reliable.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic block diagram of an IGBT overcurrent detection protection circuit according to an exemplary embodiment;
fig. 2 is a circuit schematic diagram illustrating an IGBT over-current detection protection circuit according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example one
Fig. 1 is a schematic block diagram of an IGBT overcurrent detection protection circuit according to an exemplary embodiment, as shown in fig. 1, the circuit including:
the switch module 101 is arranged between the output end of the IGBT inversion module and a load; the IGBT inversion module is connected with a main control chip through a first driving circuit, and the main control chip is used for generating PWM signals;
and the control module 102 is connected with the switch module 101, is connected with the main control chip, and is used for controlling the main control chip to stop outputting the PWM signal and controlling the switch module 101 to disconnect from the load when the output current of the IGBT inverter module is greater than the threshold current.
Preferably, the load comprises at least one of:
motor, compressor, fan.
It can be understood that, according to the technical solution provided by this embodiment, applicable scenarios include but are not limited to: the compressor driving circuit, the motor driving circuit and the fan driving circuit.
Referring to fig. 2, the IGBT inverter modules are shown as Q1 to Q6 in fig. 2. In a specific practice, the switching module 101, comprises:
at least one P-type IGBT module Q7 (the number of P-type IGBT modules is selected according to the magnitude of the output current of the IGBT inverter module, for example, if the output current of the IGBT inverter module is small, one P-type IGBT module may be selected, and if the output current of the IGBT inverter module is large, a plurality of P-type IGBT modules may be selected to be connected in parallel);
if a plurality of P-type IGBT modules Q7 are provided, a plurality of P-type IGBT modules Q7 are connected in parallel;
the drain of the switch module 101 is connected to the output terminal of the IGBT inverter module, the source is grounded, and the gate is connected to the control module 102 through a second driving circuit 1011.
Preferably, the control module 102 includes:
a non-inverting input terminal of the non-inverting amplifier Q8 is connected to the drain of the switch module 101, an inverting input terminal of the non-inverting amplifier Q8 is connected to the source of the switch module 101 through a first resistor R1, and an output terminal of the non-inverting amplifier Q8 is connected to the source of the switch module 101 through a second resistor R2 and is connected to the main control chip;
a positive phase input end of the comparator Q9 is externally connected with a reference voltage source, and a negative phase input end of the comparator Q9 is connected with the output end of the non-inverting amplifier; the reference voltage output by the reference voltage source is positively correlated with the threshold current;
a first multivibrator 1021, an input terminal of which is connected to the output terminal of the comparator Q9, and an output terminal of which is connected to the second driving circuit 1011;
a second multivibrator 1022 has an input connected to the output of the comparator Q9 and an output connected to the main control chip.
It can be understood that the comparator Q9 outputs a low level signal when the input voltage is greater than the reference voltage outputted by the reference voltage source; when the input voltage is smaller than the reference voltage output by the reference voltage source, outputting a high-level signal;
the first multivibrator 1021 outputs a low level signal lasting for a first time period T1 while the comparator Q9 outputs the low level signal, so as to control the switch module 101 to be disconnected from the load;
the second multivibrator 1022 outputs a low level signal lasting for a second time period T2 when the comparator Q9 outputs the low level signal, so as to control the main control chip to stop outputting the PWM signal.
In particular practice, it will be appreciated that the first multivibrator 1021 and the second multivibrator 1022 are used to generate a rectangular wave, and the duty ratio of the generated rectangular wave can be adjusted to control the duration of the output low level signal. The first time length T1 and the second time length T2 can be determined according to actual situations and application scenarios as needed. Preferably, the first duration T1 ≦ the second duration T2.
For convenience of understanding, the operating principle of the IGBT overcurrent detection protection circuit provided in this embodiment is explained in detail with reference to the circuit schematic diagram shown in fig. 2, specifically as follows:
referring to fig. 2, when the IGBT inverter module operates normally, the P-type IGBT module Q7 operates in a conducting state. Because there is an internal resistance when Q7 is turned on, the voltage across Q7 can be collected to convert the current flowing through Q7 (i.e. the total three-phase current output by the IGBT inverter module) when it is turned on. Voltage signals collected by the Q7 are sent to a main control chip for current protection of software after passing through a non-inverting amplifier Q8; at the same time, the voltage signal is also sent to a comparator Q9, and is compared with a reference voltage V output by a reference voltage sourcerefA comparison is made.
When the IGBT inverter module is not short-circuited or has a large current sudden change, the comparator Q9 outputs a constant high level, the first multivibrator 1021 and the second multivibrator 1022 are not triggered, and the IGBT inverter module operates normally.
When the IGBT inversion module is short-circuited or has large current sudden change, the input voltage of the comparator Q9 is larger than the reference voltage V along with the rapid increase of the currentrefAt this time, the level of the output of the comparator Q9 changes from high to low. The processing by the first multivibrator 1021 and the second multivibrator 1022 will generate low level signals with duration T1, T2, respectively.
A low-level signal with the duration of T1 acts on the P-type IGBT module Q7, the P-type IGBT module Q7 is disconnected for a time of T1, the whole load loop is cut off at the moment, and a load device is prevented from being burnt out by large current; and a low level signal with the duration of T2 acts on the main control chip, and the main control chip stops outputting the PWM signal within the duration of T2, so that the IGBT inverter module is completely disconnected. Due to the design of the double-protection structure, the IGBT inverter module is safer and more reliable.
It can be understood that, according to the technical scheme provided by this embodiment, the switch module is arranged between the output end of the IGBT inverter module and the load, and the control module controls the main control chip to stop outputting the PWM signal and control the switch module to disconnect the load when the output current of the IGBT inverter module is greater than the threshold current, so that when the IGBT inverter module is short-circuited or has a large current sudden change, the IGBT and the load circuit are turned off, thereby implementing dual protection of the IGBT module, improving timeliness and effectiveness of the IGBT overcurrent detection protection, and solving the problem of delay in protection caused by detecting the IGBT current by software in the prior art.
Further, the technical scheme that this embodiment provided, will overflow and detect and IGBT protection integration together, adopt hardware to build protection circuit, the circuit integrated level is high, detects IGBT current with software and carries out overcurrent protection collocation and use, safe and reliable more.
Example two
A compressor drive circuit is shown according to an exemplary embodiment, including:
the IGBT overcurrent detection protection circuit is disclosed.
It can be understood that, in the technical scheme provided by this embodiment, since the compressor driving circuit includes the IGBT overcurrent detection protection circuit described in the first embodiment, the IGBT overcurrent detection protection circuit controls the main control chip to stop outputting the PWM signal and controls the switch module to disconnect the load by setting the switch module between the output end of the IGBT inverter module and the load and controlling the switch module to disconnect the load when the output current of the IGBT inverter module is greater than the threshold current, so that when the IGBT inverter module is short-circuited or has a large current mutation, the IGBT and the load circuit are turned off, and thus double protection of the IGBT module is achieved, timeliness and effectiveness of IGBT overcurrent detection protection are improved, and the problem of protection delay due to the fact that software is used to detect the IGBT current for overcurrent protection in the prior art can be solved.
Further, the technical scheme that this embodiment provided, will overflow and detect and IGBT protection integration together, adopt hardware to build protection circuit, the circuit integrated level is high, detects IGBT current with software and carries out overcurrent protection collocation and use, safe and reliable more.
EXAMPLE III
A compressor is shown according to an exemplary embodiment, comprising:
the compressor driving circuit is described above.
It can be understood that, in the technical scheme provided by this embodiment, since the compressor includes the IGBT over-current detection protection circuit described in the first embodiment, the IGBT over-current detection protection circuit controls the main control chip to stop outputting the PWM signal and controls the switch module to disconnect the PWM signal when the output current of the IGBT inverter module is greater than the threshold current through the control module, so that when the IGBT inverter module is short-circuited or has a large current sudden change, the IGBT and the load circuit are turned off, thereby implementing dual protection of the IGBT module, improving timeliness and effectiveness of the IGBT over-current detection protection, and solving the problem of protection delay caused by detecting the IGBT current by software in the prior art.
Further, the technical scheme that this embodiment provided, will overflow and detect and IGBT protection integration together, adopt hardware to build protection circuit, the circuit integrated level is high, detects IGBT current with software and carries out overcurrent protection collocation and use, safe and reliable more.
Example four
An air conditioning device is shown according to an exemplary embodiment, comprising:
the compressor described above.
Preferably, the air conditioning device includes:
air conditioning, and/or a fresh air machine.
It can be understood that, in the technical scheme provided by this embodiment, since the air conditioning device includes the IGBT over-current detection protection circuit described in the first embodiment, the IGBT over-current detection protection circuit controls the main control chip to stop outputting the PWM signal and controls the switch module to disconnect the load when the output current of the IGBT inverter module is greater than the threshold current by setting the switch module between the output end of the IGBT inverter module and the load, so that when the IGBT inverter module is short-circuited or has a large current mutation, the IGBT is turned off and the load circuit is cut off, thereby implementing dual protection of the IGBT module, improving timeliness and effectiveness of the IGBT over-current detection protection, and solving the problem of protection delay caused by detecting the IGBT current by software in the prior art.
Further, the technical scheme that this embodiment provided, will overflow and detect and IGBT protection integration together, adopt hardware to build protection circuit, the circuit integrated level is high, detects IGBT current with software and carries out overcurrent protection collocation and use, safe and reliable more.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An IGBT over-current detection protection circuit is characterized by comprising:
the switch module is arranged between the output end of the IGBT inversion module and a load; the IGBT inversion module is connected with a main control chip through a first driving circuit, and the main control chip is used for generating PWM signals;
and the control module is connected with the switch module, is simultaneously connected with the main control chip and is used for controlling the main control chip to stop outputting the PWM signal and controlling the switch module to be disconnected with the load when the output current of the IGBT inversion module is greater than the threshold current.
2. The circuit of claim 1, wherein the switch module comprises:
at least one P-type IGBT module;
if the number of the P-type IGBT modules is multiple, the P-type IGBT modules are connected in parallel;
the drain electrode of the switch module is connected with the output end of the IGBT inversion module, the source electrode of the switch module is grounded, and the grid electrode of the switch module is connected with the control module through a second drive circuit.
3. The circuit of claim 2, wherein the control module comprises:
the non-inverting input end of the non-inverting amplifier is connected with the drain electrode of the switch module, the inverting input end of the non-inverting amplifier is connected with the source electrode of the switch module through a first resistor, and the output end of the non-inverting amplifier is connected with the source electrode of the switch module through a second resistor and is also connected with the main control chip;
the positive phase input end of the comparator is externally connected with a reference voltage source, and the negative phase input end of the comparator is connected with the output end of the in-phase amplifier; the reference voltage output by the reference voltage source is positively correlated with the threshold current;
a first multivibrator, the input terminal of which is connected to the output terminal of the comparator, and the output terminal of which is connected to the second driving circuit;
and the input end of the second multivibrator is connected with the output end of the comparator, and the output end of the second multivibrator is connected with the main control chip.
4. The circuit of claim 3,
the comparator is used for outputting a low-level signal when the input voltage is greater than the reference voltage output by the reference voltage source; when the input voltage is smaller than the reference voltage output by the reference voltage source, outputting a high-level signal;
the first multivibrator is used for outputting a low level signal lasting for a first duration when the comparator outputs the low level signal so as to control the switch module to be disconnected from the load;
and the second multivibrator is used for outputting a low level signal lasting for a second time length when the comparator outputs the low level signal so as to control the main control chip to stop outputting the PWM signal.
5. The circuit of claim 4,
the first duration is less than or equal to the second duration.
6. A circuit according to any of claims 1 to 5, wherein the load comprises at least one of:
motor, compressor, fan.
7. A compressor drive circuit, comprising:
the IGBT over-current detection protection circuit of any one of claims 1 to 6.
8. A compressor, comprising:
the compressor drive circuit of claim 7.
9. An air conditioning device characterized by comprising:
the compressor of claim 8.
10. The air conditioning device according to claim 9, characterized by comprising:
air conditioning, and/or a fresh air machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111422938.9A CN114024533A (en) | 2021-11-26 | 2021-11-26 | IGBT over-current detection protection circuit, compressor and air conditioning device |
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| CN202111422938.9A CN114024533A (en) | 2021-11-26 | 2021-11-26 | IGBT over-current detection protection circuit, compressor and air conditioning device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420349A (en) * | 2023-12-18 | 2024-01-19 | 安徽雷彻科技有限公司 | Overcurrent detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420349A (en) * | 2023-12-18 | 2024-01-19 | 安徽雷彻科技有限公司 | Overcurrent detection circuit |
| CN117420349B (en) * | 2023-12-18 | 2024-02-27 | 安徽雷彻科技有限公司 | Overcurrent detection circuit |
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