CN108966396B - Electromagnetic heating system, IGBT drive control circuit and fault detection method thereof - Google Patents
Electromagnetic heating system, IGBT drive control circuit and fault detection method thereof Download PDFInfo
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- CN108966396B CN108966396B CN201710368459.0A CN201710368459A CN108966396B CN 108966396 B CN108966396 B CN 108966396B CN 201710368459 A CN201710368459 A CN 201710368459A CN 108966396 B CN108966396 B CN 108966396B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
Abstract
The invention discloses an electromagnetic heating system, a drive control circuit of an IGBT and a fault detection method thereof, wherein the drive control circuit comprises a drive module, a synchronous detection module, a drive voltage regulation module and a control module, wherein the synchronous detection module is used for detecting voltages at two ends of a resonance module so as to output synchronous detection signals; the driving voltage adjusting module is used for adjusting the driving module to respectively output a driving voltage in a saturation region and a driving voltage in an amplification region to the IGBT according to the voltage adjusting signal output by the control module; the control module is used for outputting a control pulse to the driving module to drive the IGBT to be switched on or switched off, enabling the resonance module to perform resonance work by adjusting the width of the control pulse, and judging whether the driving voltage adjusting branch circuit breaks down or not according to the time difference between a synchronous detection signal received when the driving module outputs a saturated region driving voltage and a synchronous detection signal received when the driving module outputs an amplification region driving voltage, so that whether the driving voltage breaks down or not is effectively judged.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to a drive control circuit of an Insulated Gate Bipolar Transistor (IGBT) in an electromagnetic heating system, the electromagnetic heating system and a fault detection method of the drive control circuit of the IGBT in the electromagnetic heating system.
Background
In an electromagnetic heating system (such as an induction cooker) with an IGBT, a control signal is output by a controller to an IGBT drive circuit to drive the IGBT on or off by the IGBT drive circuit. The IGBT driving circuit is provided with a saturation region driving voltage and an amplification region driving voltage, and when any one of the two driving voltages fails, if the IGBT is continuously controlled to work, the IGBT breaks down or fails in function or generates noise.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, a first objective of the present invention is to provide a driving control circuit for an IGBT in an electromagnetic heating system, which determines whether a driving voltage regulating branch has a fault according to a time difference between a synchronous detection signal received when a driving module outputs a driving voltage in a saturation region and a synchronous detection signal received when the driving module outputs a driving voltage in an amplification region, so as to effectively determine whether the driving voltage has a fault, and timely take a protective measure when the driving voltage has a fault, thereby preventing the IGBT from continuing to operate and causing damage or noise.
A second object of the present invention is to provide an electromagnetic heating system.
A third object of the present invention is to provide a method for detecting a fault of a drive control circuit of an IGBT in an electromagnetic heating system.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a driving control circuit for an IGBT in an electromagnetic heating system, including a driving module, a synchronous detection module, a driving voltage adjustment module, and a control module, where the synchronous detection module is connected to the control module, and the synchronous detection module is configured to detect voltages at two ends of a resonance module in the electromagnetic heating system to output a synchronous detection signal to the control module; the driving voltage adjusting module is connected with the control module and used for adjusting the driving module to respectively output a saturated region driving voltage and an amplification region driving voltage to the IGBT according to a voltage adjusting signal output by the control module, wherein the saturated region driving voltage is greater than the amplification region driving voltage; the control module is connected with the driving module and used for outputting a control pulse to the driving module so as to drive the IGBT to be switched on or switched off through the driving module, enabling the resonance module to perform resonance work by adjusting the width of the control pulse, and judging whether the driving voltage adjusting branch circuit breaks down or not according to the time difference between a synchronous detection signal received when the driving module outputs the driving voltage of the saturation region and a synchronous detection signal received when the driving module outputs the driving voltage of the amplification region.
According to the drive control circuit of the IGBT in the electromagnetic heating system, the synchronous detection module is used for detecting the voltages at two ends of the resonance module in the electromagnetic heating system to output the synchronous detection signal to the control module, the drive voltage adjusting module is used for adjusting the drive module to respectively output the saturated region drive voltage and the amplification region drive voltage to the IGBT according to the voltage adjusting signal output by the control module, the control module is used for outputting the control pulse to the drive module to drive the IGBT to be switched on or switched off through the drive module, the width of the control pulse is adjusted to enable the resonance module to carry out resonance work, and whether the drive voltage adjusting branch circuit is in fault or not is judged according to the time difference between the synchronous detection signal received when the drive module outputs the saturated region drive voltage and the synchronous detection signal received when the drive module outputs the amplification region drive voltage, therefore, whether the driving voltage has a fault or not is effectively judged, so that protective measures are taken in time when the driving voltage has the fault, and the IGBT is prevented from being damaged or generating noise due to continuous work.
According to an embodiment of the present invention, when the control module adjusts the driving module to output the saturation region driving voltage through the driving voltage adjusting module, the control module increases the width of the control pulse every first preset time until receiving a synchronous detection signal output by the synchronous detection module, the control module obtains the width of the current control pulse and stops outputting the control pulse, and after a second preset time, the control module adjusts the driving module to output the amplification region driving voltage through the driving voltage adjusting module, and increases the width of the control pulse every first preset time from the obtained width of the current control pulse until receiving the synchronous detection signal output by the synchronous detection module, the control module obtains the duration from the driving module outputting the amplification region driving voltage to the synchronous detection module receiving the synchronous detection signal output by the synchronous detection module And the time T or the number N of control pulses output from the time when the driving module outputs the driving voltage of the amplification area to the time when the synchronous detection signal output by the synchronous detection module is received is determined, and whether the driving voltage regulating branch fails or not is judged according to the duration T or the number N of the control pulses.
According to an embodiment of the invention, when the duration T is less than or equal to a first time threshold T1 or the difference between the duration T and the obtained width of the current control pulse is less than or equal to a second time threshold T, the control module determines that the driving voltage regulating branch is faulty.
According to one embodiment of the invention, T1 is greater than or equal to 2(T1+ T2), T is greater than or equal to 0.1 microseconds, wherein T1 is the first preset time, and T2 is the width of the acquired current control pulse.
According to an embodiment of the present invention, when the number N of the control pulses is less than or equal to a preset threshold N1, the control module determines that the driving voltage regulating branch has a fault.
Wherein n1 is an integer of 2 or more.
In order to achieve the above object, a second embodiment of the present invention provides an electromagnetic heating system, which includes a drive control circuit of an IGBT in the electromagnetic heating system.
According to the electromagnetic heating system provided by the embodiment of the invention, through the IGBT drive control circuit, whether the drive voltage regulating branch circuit breaks down or not can be judged according to the time difference between the synchronous detection signal received when the drive module outputs the drive voltage of the saturation region and the synchronous detection signal received when the drive module outputs the drive voltage of the amplification region, so that whether the drive voltage breaks down or not can be effectively judged, and protective measures can be taken in time when the drive voltage breaks down, so that the IGBT is prevented from being damaged or generating noise due to continuous work.
In order to achieve the above object, a third aspect of the present invention provides a fault detection method for a drive control circuit of an IGBT in an electromagnetic heating system, where the drive control circuit of the IGBT includes a drive module, a synchronous detection module, a drive voltage regulation module, and a control module, and the fault detection method includes the following steps: the control module outputs a control pulse to the driving module so as to drive the IGBT to be switched on or switched off through the driving module, and the width of the control pulse is adjusted so as to enable a resonance module in the electromagnetic heating system to perform resonance work; the synchronous detection module outputs a synchronous detection signal to the control module by detecting the voltage at two ends of the resonance module; the control module outputs a voltage regulation signal to the driving voltage regulation module so as to regulate the driving module to respectively output a saturation region driving voltage and an amplification region driving voltage to the IGBT through the driving voltage regulation module, and judges whether a driving voltage regulation branch circuit fails according to a time difference between a synchronous detection signal received when the driving module outputs the saturation region driving voltage and a synchronous detection signal received when the driving module outputs the amplification region driving voltage, wherein the saturation region driving voltage is greater than the amplification region driving voltage.
According to the fault detection method for the drive circuit of the IGBT in the electromagnetic heating system, firstly, the control module outputs the control pulse to the drive module to drive the IGBT to be switched on or switched off through the drive module, and the width of the control pulse is adjusted to enable the resonance module in the electromagnetic heating system to perform resonance operation. Meanwhile, the synchronous detection module outputs a synchronous detection signal to the control module by detecting the voltages at two ends of the resonance module, the control module outputs a voltage regulation signal to the driving voltage regulation module to regulate the driving module to respectively output a saturation region driving voltage and an amplification region driving voltage to the IGBT by the driving voltage regulation module, and whether the driving voltage regulation branch circuit breaks down or not is judged according to the time difference between the synchronous detection signal received when the driving module outputs the saturation region driving voltage and the synchronous detection signal received when the driving module outputs the amplification region driving voltage. Therefore, whether the driving voltage has a fault or not is effectively judged, so that protective measures are taken in time when the driving voltage has the fault, and the IGBT is prevented from being damaged or generating noise due to continuous work.
According to an embodiment of the present invention, determining whether a driving voltage adjusting branch circuit has a fault according to a time difference between a synchronous detection signal received when the driving module outputs the saturation region driving voltage and a synchronous detection signal received when the driving module outputs the amplification region driving voltage includes: the control module adjusts the driving module to output the driving voltage of the saturation region through the driving voltage adjusting module, the width of the control pulse is increased every other first preset time until receiving the synchronous detection signal output by the synchronous detection module, and the control module obtains the width of the current control pulse and stops outputting the control pulse; and after a second preset time, the control module adjusts the driving module to output the driving voltage of the amplification area through the driving voltage adjusting module, and increasing the width of the control pulse every other the first preset time from the acquired width of the current control pulse until receiving a synchronous detection signal output by the synchronous detection module, the control module obtains the duration T from the time when the driving module outputs the driving voltage of the amplification area to the time when the synchronous detection signal output by the synchronous detection module is received or the number N of control pulses output from the time when the driving module outputs the driving voltage of the amplification area to the time when the synchronous detection signal output by the synchronous detection module is received, and judging whether the driving voltage regulating branch circuit has faults or not according to the duration T or the number N of the control pulses.
According to an embodiment of the invention, when the duration T is less than or equal to a first time threshold T1 or the difference between the duration T and the obtained width of the current control pulse is less than or equal to a second time threshold T, the control module determines that the driving voltage regulating branch is faulty.
According to one embodiment of the invention, T1 is greater than or equal to 2(T1+ T2), T is greater than or equal to 0.1 microseconds, wherein T1 is the first preset time, and T2 is the width of the acquired current control pulse.
According to an embodiment of the present invention, when the number N of the control pulses is less than or equal to a preset threshold N1, the control module determines that the driving voltage regulating branch has a fault.
Wherein n1 is an integer of 2 or more.
Drawings
Fig. 1 is a schematic configuration diagram of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention;
FIG. 2 is a graph of a synchronization detection signal according to one embodiment of the present invention;
fig. 3 is a circuit diagram of a drive control circuit of an IGBT in the electromagnetic heating system according to an embodiment of the present invention;
FIG. 4 is a block schematic diagram of an electromagnetic heating system according to one embodiment of the present invention;
fig. 5 is a flowchart of a fault detection method of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A drive control circuit of an IGBT in an electromagnetic heating system, and a fault detection method of a drive circuit of an IGBT in an electromagnetic heating system proposed according to an embodiment of the present invention are described below with reference to the drawings.
In the embodiment of the invention, the electromagnetic heating system can be an electromagnetic heating product such as an electromagnetic oven, an electromagnetic rice cooker, an electromagnetic pressure cooker and the like.
Fig. 1 is a schematic structural diagram of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 1, the drive control circuit of the IGBT in the electromagnetic heating system according to the embodiment of the present invention may include: a driving module 10, a synchronous detection module 20, a driving voltage adjustment module 30 and a control module 40.
The synchronous detection module 20 is connected to the control module 40, and the synchronous detection module 20 is configured to detect voltages at two ends of the resonance module 50 in the electromagnetic heating system to output a synchronous detection signal to the control module 40. For example, the resonance module 50 may include a resonance capacitor 51 and a heating coil 52 connected in parallel, the voltage across the resonance module 50 refers to the voltage across the resonance capacitor 51 and the heating coil 52 connected in parallel, that is, the voltages at points a and B in the figure, and the synchronous detection module 20 detects the voltages at points a and B to output a synchronous detection signal to the control module 40.
The driving voltage adjusting module 30 is connected to the control module 40, and the driving voltage adjusting module 30 is configured to adjust the driving module 10 to output a saturation region driving voltage and an amplification region driving voltage to the IGBT respectively according to a voltage adjusting signal output by the control module 40, where the saturation region driving voltage is greater than the amplification region driving voltage. For example, when the control module 40 outputs a first voltage adjustment signal (e.g., a high level signal) to the driving voltage adjustment module 30, the driving voltage adjustment module 30 adjusts the driving module 10 to output a saturation region driving voltage (e.g., 18V) to the IGBT according to the adjustment signal; when the control module 40 outputs a second voltage adjustment signal (e.g., a low level signal) to the driving voltage adjustment module 30, the driving voltage adjustment module 30 adjusts the driving module 10 to output an amplification region driving voltage (e.g., 10V) to the IGBT according to the adjustment signal.
The control module 40 is connected to the driving module 10, and the control module 40 is configured to output a control pulse to the driving module 10 to drive the IGBT to turn on or turn off through the driving module 10, perform resonance control on the resonance module 50 by adjusting a width of the control pulse, and determine whether the driving voltage adjusting branch fails according to a time difference between a synchronous detection signal received when the driving module 10 outputs a driving voltage in a saturation region and a synchronous detection signal received when the driving module 10 outputs a driving voltage in an amplification region.
Specifically, the drive voltage of the IGBT includes a saturation region drive voltage (e.g., 18V) and an amplification region drive voltage (e.g., 10V), and the two different drive voltages drive the IGBT to conduct at different currents under the same control pulse width, so that the resonant current and thus the resonant amplitude are different. Under the drive voltage of the saturation region, when the adopted control pulse width is appropriate, the synchronous detection signal can be detected through the resonance amplitude generated at the moment, and under the same control pulse width, when the IGBT is driven by the drive voltage of the amplification region, the current when the IGBT is conducted is relatively small because the drive voltage of the amplification region is smaller than the drive voltage of the saturation region, and the synchronous detection signal cannot be detected at the moment because the drive voltage of the amplification region is relatively small than the drive voltage of the saturation region. Therefore, the present invention determines whether the driving voltage fails based on this principle.
Specifically, in the operation process of the electromagnetic heating system, a first voltage adjustment signal (e.g., a high level signal) may be first output to the driving voltage adjustment module 30 to adjust the driving module 10 to output the saturation region driving voltage to the IGBT, and the control module 40 outputs a control pulse to the driving module 10 to drive the IGBT to turn on or turn off through the driving module 10, when the IGBT is turned on or turned off, the voltage across the heating coil 52 changes abruptly to generate resonance, and the heating coil 52 performs resonance heating. In this process, the control module 40 also obtains the synchronous detection signal in real time through the synchronous detection module 20, wherein when obtaining the synchronous detection signal, the synchronous detection signal can be obtained according to the voltage change degree of the point a (i.e. the resonance amplitude of the point a) because the voltage change of the point B in the resonance process is not obvious and the voltage of the point a has a sudden change. As shown in fig. 2, when the voltage at the point a varies greatly, the voltage difference between the point a and the point B is large, and the synchronization detection signal is obtained at this time. When the control module 40 obtains two or more consecutive synchronous detection signals, the width of the control pulse currently output by the control module 40 is recorded and can be represented by time.
Then, the control module 40 outputs a second voltage adjustment signal (e.g., a low level signal) to the driving voltage adjustment module 30 to adjust the driving module 10 to output the amplification region driving voltage to the IGBT, and simultaneously, the control module 40 outputs a control pulse to the driving module 10 to drive the IGBT to be turned on or off through the driving module 10 for resonant heating. In this process, the control module 40 also acquires the synchronous detection signal in real time, and records the time from the output of the second voltage adjustment signal to the acquisition of the synchronous detection signal when two or more synchronous detection signals are continuously acquired. And finally, judging whether the driving voltage regulating branch circuit breaks down or not according to the obtained two times, namely judging whether the driving voltage breaks down or not, and if so, taking corresponding protective measures to protect the IGBT and prevent the IGBT from being damaged, invalid or generating noise and the like.
Further, according to an embodiment of the present invention, when the control module 40 adjusts the driving module 10 to output the saturation region driving voltage through the driving voltage adjusting module 30, the width of the control pulse is increased every first preset time until the synchronous detection signal output by the synchronous detection module 20 is received, the control module 40 obtains the width of the current control pulse and stops outputting the control pulse, and after the second preset time, the control module 40 adjusts the driving module 10 to output the amplification region driving voltage through the driving voltage adjusting module 30 and increases the width of the control pulse every first preset time from the obtained width of the current control pulse, until the synchronous detection signal output by the synchronous detection module 20 is received, the control module 40 obtains the duration T from when the driving module 10 outputs the amplification region driving voltage to when the synchronous detection signal output by the synchronous detection module 20 is received or obtains the duration T from when the driving module 10 outputs the amplification region driving voltage to when the synchronous detection signal output by the synchronous detection module 20 is received The number N of control pulses output when the synchronous detection signal output by the synchronous detection module 20 arrives, and whether the driving voltage regulation branch has a fault is determined according to the duration T or the number N of control pulses.
According to an embodiment of the present invention, when the duration T is less than or equal to the first time threshold T1 or the difference between the duration T and the obtained width of the current control pulse is less than or equal to the second time threshold T, the control module 40 determines that the driving voltage adjusting branch is failed.
According to another embodiment of the present invention, when the number N of the control pulses is less than or equal to the preset threshold N1, the control module 40 determines that the driving voltage regulating branch is faulty.
Specifically, as shown in fig. 2, the control module 40 outputs a first voltage adjustment signal to the driving voltage adjustment module 30, at this time, the driving voltage adjustment module 30 adjusts the driving module 10 to output the saturation region driving voltage, and at the same time, the control module 40 outputs a control pulse with a width of t0(t0 may be a value less than 3 microseconds) to the driving module 10, and the width of the control pulse is increased by Δ t every first preset time t1 from t 0. As the control pulse width increases, the current for driving the IGBT to conduct becomes larger, the resonance amplitude becomes larger, and when the resonance amplitude reaches a certain level, the synchronous detection module 20 will obtain a synchronous detection signal by detecting the voltages at the points a and B. When the synchronous detection signal is obtained for the first time, the width of the control pulse is not increased any more, and at the same time, the control module 40 continues to obtain whether there is a synchronous detection signal, and if the synchronous detection signal is obtained a plurality of times in succession (interference is eliminated), the width of the control pulse at that time is recorded, and the time is represented as t2, and the output of the control pulse is stopped.
After delaying the second preset time t3, the control module 40 starts to output the second voltage adjustment signal to the driving voltage adjustment module 30, the driving voltage adjustment module 30 adjusts the driving module 10 to output the driving voltage of the amplification region, and meanwhile, the control module 40 starts to output the control pulse with the time corresponding to the width t2 to the driving module 10. Since the amplification region driving voltage is smaller than the saturation region driving voltage, the control module 40 cannot acquire the synchronization detection signal at this time. Then, the width of the control pulse is increased in the same manner as described above, that is, the width of the control pulse is increased by Δ t every first preset time t1 until the synchronization detection signal is acquired again, and the increase of the width of the control pulse is stopped. The control module 40 continues to acquire the sync detection signal, and if the sync detection signal is acquired a plurality of times in succession (interference is excluded), records the time from after the second preset time T3 to when the sync detection signal is acquired again, i.e., the time from T2 to the time when the sync detection signal is acquired again, i.e., the duration T, or the number N of control pulses recorded within the duration T. Then, the control module 40 determines whether the driving voltage regulating branch circuit has a fault according to the duration T or the number N of the control pulses.
For example, when T is less than or equal to the first time threshold T1 or T-T2 is less than or equal to the second time threshold T, the control module 40 determines that the driving voltage regulating branch is failed; otherwise, the control module 40 determines that the driving voltage adjusting branch is working normally. For another example, when N is less than or equal to the preset threshold N1, the control module 40 determines that the driving voltage adjusting branch has a fault; otherwise, the control module 40 determines that the driving voltage adjusting branch is working normally.
The first preset time T1, the second preset time T3, the first time threshold T1, the second time threshold T, and the preset threshold n1 may be calibrated according to actual conditions. For example, the first time threshold T1 ≧ 2(T1+ T2), the second time threshold T may be a value greater than or equal to 0.1 microseconds, where T2 is the width of the acquired current control pulse, and the preset threshold n1 may be an integer greater than or equal to 2.
The following further description is given in conjunction with specific examples of the present invention.
Fig. 3 is a circuit diagram of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention.
As shown in fig. 3, the driving module 10 may include a first resistor R1, a second resistor R2, a first diode D1, a first switch Q1, a third resistor R3, a fourth resistor R4, a second switch Q2, a third switch Q3, a first capacitor C1, a fifth resistor R5, a sixth resistor R6, and a first regulator TV 1. One end of the first resistor R1 is connected to the preset power VCC, the other end of the first resistor R1 is connected to one end of the second resistor R2, the cathode of the first diode D1 is connected to the control pulse output terminal OUT1 of the control module 40, and the other end of the second resistor R2 is connected to the anode of the first diode D1 and the base of the first switch tube Q1. The collector of the first switch Q1 is connected to the predetermined power source VCC through a third resistor R3, and the emitter of the first switch Q1 is grounded. The base of the second switch tube Q2 and the base of the third switch tube Q3 are connected to the collector of the first switch tube Q1 and one end of the first capacitor C1, respectively, and the other end of the first capacitor C1 is grounded. The collector of the second switching tube Q2 is further connected with a preset power source VCC through a fourth resistor R4, the emitter of the second switching tube Q2 is connected with the emitter of the third switching tube Q3 and then connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with the base of the IGBT, and the collector of the third switching tube Q3 is grounded. The other end of the fifth resistor R5 is also connected with one end of the sixth resistor R6 and the cathode of the first voltage regulator tube TV1, and the other end of the sixth resistor R6 is connected with the anode of the first voltage regulator tube TV1 and then grounded.
The driving voltage regulating module 30 may include a fourth switching tube Q4, a second regulator tube TV2, and a seventh resistor R7. The base of the fourth switch tube Q4 is connected with the voltage regulation output end OUT2 of the control module 40 through a seventh resistor R7, the collector of the fourth switch tube Q4 is connected with the anode of a second voltage regulator tube TV2, the cathode of the second voltage regulator tube TV2 is connected with the other end of a fifth resistor R5, and the emitter of the fourth switch tube Q4 is grounded. The first switch tube Q1, the second switch tube Q2, and the fourth switch tube Q4 are NPN transistors, the third switch tube Q3 is a PNP transistor, the voltage of the preset power source VCC is 18V, the voltage of the first voltage regulator tube TV1 may be 19V, and the voltage of the second voltage regulator tube TV2 is 10V.
The synchronous detection module 20 includes a first detection end, a second detection end, a first output end and a second output end, wherein the first detection end is connected to the point B, the second detection end is connected to the point a, the first output end is connected to the point B voltage detection end VB of the control module 40, and the second output end is connected to the point a voltage detection end VA of the control module 40. The synchronous detection module 20 is mainly composed of resistors, detects voltages of the points B and a by a resistor voltage division method, the control module 40 obtains a synchronous detection signal according to the detected voltages of the points a and B, and detects the synchronous detection signal if a difference between the voltage of the point a and the voltage of the point B is detected to be large, a specific circuit structure is shown in fig. 3, and will not be described in detail here.
When the electromagnetic heating system is powered on and works, the rectifying module 70 converts the ac mains power provided by the power module 60 into pulsed dc power, and then outputs stable dc voltage to the resonant tank after filtering processing is performed by the filtering module 80 and the smoothing filter capacitor 90. The control module 40 outputs a driving voltage adjusting signal to the driving voltage adjusting module 30 through the voltage adjusting output terminal OUT2, and outputs a control pulse to the driving module 10, and the driving module 10 performs driving control on the IGBT according to the signal and the control pulse signal output by the driving voltage adjusting module 30.
When the control pulse is a low-level signal and the driving voltage adjusting signal is a low-level signal, the first switching tube Q1 is turned off, the second switching tube Q2 is turned on, the voltage at the other end of the fifth resistor R5 is the voltage of the preset power source VCC, namely 18V, at this time, the driving module 10 outputs a saturation region driving voltage 18V to the IGBT, and the IGBT is turned on under the saturation region driving voltage; when the control pulse is a high level signal and the driving voltage adjusting signal is a low level signal, the first switching tube Q1 is turned on, the third switching tube Q3 is turned on, and at this time, the voltage at the other end of the fifth resistor R5 is 0, that is, the base voltage of the IGBT is 0, and the IGBT is turned off.
When the control pulse is a low level signal and the driving voltage adjusting signal is a high level signal, the first switch tube Q1 is turned off, the second switch tube Q2 is turned on, and because the driving voltage adjusting signal is a high level signal, the fourth switch tube Q4 is in a conducting state, and the breakdown voltage of the second regulator tube TV2 is 10V, under the voltage stabilizing effect of the second regulator tube TV2, the other end of the fifth resistor R5 outputs 10V voltage instead of 18V voltage, at this time, the driving module 10 outputs 10V of driving voltage of an amplification area to the IGBT, and the IGBT is turned on under the driving voltage of the amplification area; when the control pulse is a high level signal and the driving voltage adjusting signal is a high level signal, the first switching tube Q1 is turned on, the third switching tube Q3 is turned on, and at this time, the voltage at the other end of the fifth resistor R5 is 0, that is, the base voltage of the IGBT is 0, and the IGBT is turned off.
Based on the above-mentioned circuit operating principle of the driving module 10, the driving voltage adjusting module 30 and the synchronous detecting module 20, when detecting a fault of the driving voltage, the control module 40 may output a low level signal to the driving voltage adjusting module 30, and output a control pulse with a width of t0 to the driving module 10, and gradually increase the width of the control pulse every a first preset time t1 until obtaining a synchronous detecting signal, and stop increasing the width of the control pulse. Then, the control module 40 continues to acquire the synchronous detection signal, and if the synchronous detection signal is detected a plurality of times in succession, records the width of the current control pulse, i.e., the width of the control pulse at the saturation region drive voltage, as the time t2, while stopping outputting the control pulse.
After delaying the second preset time t3, the control module 40 starts outputting a high level signal to the driving voltage adjusting module 30, and simultaneously outputs a control pulse with a width of t2 to the driving module 10, and gradually increases the width of the control pulse every first preset time t1 until obtaining the synchronous detection signal again, and stops increasing the width of the control pulse. Then, the control module 40 continues to acquire the synchronous detection signal, and records the time from the output of the high level signal to the acquisition of the synchronous detection signal, i.e., the duration T, or the number N of control pulses within the duration T, if the synchronous detection signal is detected a plurality of times in succession.
Finally, the control module 40 determines whether the driving voltage regulating branch is failed according to T and T2, or whether the driving voltage regulating branch is failed according to N. For example, when T is less than or equal to a first time threshold T1 or T-T2 is less than or equal to a second time threshold T, the driving voltage regulating branch circuit is judged to be in fault; otherwise, judging that the driving voltage regulating branch circuit works normally. For another example, when N is less than or equal to the preset threshold N1, it is determined that the driving voltage regulation branch has a fault; otherwise, judging that the driving voltage regulating branch circuit works normally.
When the control module 40 determines that the driving voltage adjusting branch is faulty, the control module 40 stops outputting the control pulse to the IGBT to prevent the IGBT from being damaged, and the control module 40 displays the fault through a display module (not specifically shown in the figure) to remind a user, for example, outputting a fault code E1 to the display module.
In summary, according to the driving control circuit of the IGBT in the electromagnetic heating system of the embodiment of the invention, the synchronous detection module detects the voltages at two ends of the resonance module in the electromagnetic heating system to output the synchronous detection signal to the control module, the driving voltage adjustment module adjusts the driving module to output the driving voltage of the saturation region and the driving voltage of the amplification region to the IGBT respectively according to the voltage adjustment signal output by the control module, the control module outputs the control pulse to the driving module to drive the IGBT to be turned on or off through the driving module, the width of the control pulse is adjusted to enable the resonance module to perform the resonant operation, and whether the driving voltage adjustment branch circuit is faulty or not is determined according to the time difference between the synchronous detection signal received when the driving module outputs the driving voltage of the saturation region and the synchronous detection signal received when the driving module outputs the driving voltage of the amplification region, therefore, whether the driving voltage has a fault or not is effectively judged, so that protective measures are taken in time when the driving voltage has the fault, and the IGBT is prevented from being damaged or generating noise due to continuous work.
Fig. 4 is a block schematic diagram of an electromagnetic heating system according to one embodiment of the present invention. As shown in fig. 4, an electromagnetic heating system 1000 according to an embodiment of the present invention may include the drive control circuit 100 of the IGBT in the electromagnetic heating system described above.
According to the electromagnetic heating system provided by the embodiment of the invention, through the IGBT drive control circuit, whether the drive voltage regulating branch circuit breaks down or not can be judged according to the time difference between the synchronous detection signal received when the drive module outputs the drive voltage of the saturation region and the synchronous detection signal received when the drive module outputs the drive voltage of the amplification region, so that whether the drive voltage breaks down or not can be effectively judged, and protective measures can be taken in time when the drive voltage breaks down, so that the IGBT is prevented from being damaged or generating noise due to continuous work.
Fig. 5 is a flowchart of a fault detection method of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention.
In an embodiment of the present invention, a driving control circuit of an IGBT may include a driving module, a synchronous detection module, a driving voltage adjustment module, and a control module.
As shown in fig. 5, the method for detecting a fault of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention may include the steps of:
and S1, the control module outputs a control pulse to the driving module to drive the IGBT to be switched on or switched off through the driving module, and the width of the control pulse is adjusted to enable the resonance module in the electromagnetic heating system to perform resonance operation.
And S2, the synchronous detection module outputs a synchronous detection signal to the control module by detecting the voltage at two ends of the resonance module.
And S3, the control module outputs a voltage regulation signal to the driving voltage regulation module to regulate the driving module to output a saturation region driving voltage and an amplification region driving voltage to the IGBT respectively through the driving voltage regulation module, and judges whether the driving voltage regulation branch circuit fails according to the time difference between a synchronous detection signal received when the driving module outputs the saturation region driving voltage and a synchronous detection signal received when the driving module outputs the amplification region driving voltage, wherein the saturation region driving voltage is greater than the amplification region driving voltage.
According to an embodiment of the present invention, determining whether a driving voltage adjusting branch circuit has a fault according to a time difference between a synchronous detection signal received when a driving module outputs a driving voltage in a saturation region and a synchronous detection signal received when the driving module outputs a driving voltage in an amplification region includes: when the control module adjusts the driving voltage of the driving module output saturation region through the driving voltage adjusting module, the width of the control pulse is increased every other first preset time until the synchronous detection signal output by the synchronous detection module is received, the control module obtains the width of the current control pulse, and stops outputting the control pulse; and after the second preset time, the control module adjusts the driving voltage of the driving module output amplification area through the driving voltage adjusting module, and increases the width of the control pulse every first preset time from the width of the obtained current control pulse until the synchronous detection signal output by the synchronous detection module is received, the control module obtains the duration T from the time when the driving module outputs the driving voltage of the amplification area to the time when the synchronous detection signal output by the synchronous detection module is received or the number N of the control pulses output from the time when the driving module outputs the driving voltage of the amplification area to the time when the synchronous detection signal output by the synchronous detection module is received, and judges whether the driving voltage adjusting branch circuit fails according to the duration T or the number N of the control pulses.
According to one embodiment of the invention, when the duration T is less than or equal to a first time threshold T1 or the difference between the duration T and the obtained width of the current control pulse is less than or equal to a second time threshold T, the control module determines that the driving voltage regulating branch is in failure.
In the embodiment of the invention, T1 is greater than or equal to 2(T1+ T2), T is greater than or equal to 0.1 microsecond, wherein T1 is the first preset time, and T2 is the width of the acquired current control pulse.
According to an embodiment of the invention, when the number N of the control pulses is less than or equal to the preset threshold N1, the control module determines that the driving voltage regulating branch circuit has a fault.
In an embodiment of the present invention, n1 is an integer of 2 or more.
It should be noted that details that are not disclosed in the method for detecting a fault of a driving control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention refer to details that are disclosed in the driving control circuit of the IGBT in the electromagnetic heating system according to an embodiment of the present invention, and are not described herein again in detail.
According to the fault detection method of the IGBT driving control circuit in the electromagnetic heating system, firstly, the control module outputs the control pulse to the driving module so as to drive the IGBT to be switched on or switched off through the driving module, and the width of the control pulse is adjusted so as to enable the resonance module in the electromagnetic heating system to perform resonance operation. Meanwhile, the synchronous detection module outputs a synchronous detection signal to the control module by detecting the voltages at two ends of the resonance module, the control module outputs a voltage regulation signal to the driving voltage regulation module to regulate the driving module to respectively output a saturation region driving voltage and an amplification region driving voltage to the IGBT by the driving voltage regulation module, and whether the driving voltage regulation branch circuit breaks down or not is judged according to the time difference between the synchronous detection signal received when the driving module outputs the saturation region driving voltage and the synchronous detection signal received when the driving module outputs the amplification region driving voltage. Therefore, whether the driving voltage has a fault or not is effectively judged, so that protective measures are taken in time when the driving voltage has the fault, and the IGBT is prevented from being damaged or generating noise due to continuous work.
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.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
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 (11)
1. A drive control circuit of IGBT in electromagnetic heating system is characterized in that the drive control circuit comprises a drive module, a synchronous detection module, a drive voltage regulation module and a control module, wherein,
the synchronous detection module is connected with the control module and is used for detecting the voltage at two ends of the resonance module in the electromagnetic heating system so as to output a synchronous detection signal to the control module;
the driving voltage adjusting module is connected with the control module and used for adjusting the driving module to respectively output a saturated region driving voltage and an amplification region driving voltage to the IGBT according to a voltage adjusting signal output by the control module, wherein the saturated region driving voltage is greater than the amplification region driving voltage;
the control module is connected with the driving module and is used for outputting a control pulse to the driving module so as to drive the IGBT to be switched on or switched off through the driving module, enabling the resonance module to perform resonance work by adjusting the width of the control pulse, and judging whether a driving voltage adjusting branch circuit fails according to the time difference between a synchronous detection signal received when the driving module outputs the driving voltage of the saturation region and a synchronous detection signal received when the driving module outputs the driving voltage of the amplification region;
the control module adjusts the drive module to output the saturation region drive voltage through the drive voltage adjustment module, increases the width of the control pulse every first preset time until receiving a synchronous detection signal output by the synchronous detection module, acquires the width of the current control pulse, stops outputting the control pulse, and after a second preset time, adjusts the drive module to output the amplification region drive voltage through the drive voltage adjustment module, increases the width of the control pulse every first preset time from the acquired width of the current control pulse, and acquires the duration time T from the time when the drive module outputs the amplification region drive voltage to the time when the synchronous detection signal output by the synchronous detection module is received or from the time when the drive module receives the synchronous detection signal output by the synchronous detection module And the block outputs the driving voltage of the amplification area to the number N of control pulses output when receiving the synchronous detection signal output by the synchronous detection module, and judges whether the driving voltage regulation branch circuit fails or not according to the duration T or the number N of the control pulses.
2. The drive control circuit of the IGBT in the electromagnetic heating system according to claim 1, wherein the control module judges that the drive voltage adjusting branch is malfunctioning when the duration T is equal to or less than a first time threshold T1 or a difference between the duration T and a width of a current control pulse acquired is equal to or less than a second time threshold T.
3. The IGBT driving control circuit of the electromagnetic heating system as set forth in claim 2, wherein T1 is ≧ 2(T1+ T2), T ≧ 0.1 microsecond, where T1 is the first preset time and T2 is the width of the obtained current control pulse.
4. The drive control circuit of the IGBT in the electromagnetic heating system according to claim 1, wherein when the number N of the control pulses is equal to or less than a preset threshold N1, the control module determines that the drive voltage adjusting branch is faulty.
5. The drive control circuit of the IGBT in the electromagnetic heating system according to claim 4, wherein n1 is an integer of 2 or more.
6. An electromagnetic heating system, characterized by comprising a drive control circuit of an IGBT in the electromagnetic heating system according to any one of claims 1 to 5.
7. The fault detection method for the IGBT drive control circuit in the electromagnetic heating system is characterized in that the IGBT drive control circuit comprises a drive module, a synchronous detection module, a drive voltage regulation module and a control module, and the fault detection method comprises the following steps:
the control module outputs a control pulse to the driving module so as to drive the IGBT to be switched on or switched off through the driving module, and the width of the control pulse is adjusted so as to enable a resonance module in the electromagnetic heating system to perform resonance work;
the synchronous detection module outputs a synchronous detection signal to the control module by detecting the voltage at two ends of the resonance module;
the control module outputs a voltage regulation signal to the driving voltage regulation module so as to regulate the driving module to respectively output a saturation region driving voltage and an amplification region driving voltage to the IGBT through the driving voltage regulation module, and judges whether a driving voltage regulation branch circuit fails according to a time difference between a synchronous detection signal received when the driving module outputs the saturation region driving voltage and a synchronous detection signal received when the driving module outputs the amplification region driving voltage, wherein the saturation region driving voltage is greater than the amplification region driving voltage;
wherein, judging whether the driving voltage regulating branch circuit has a fault according to a time difference between a synchronous detection signal received when the driving module outputs the driving voltage of the saturation region and a synchronous detection signal received when the driving module outputs the driving voltage of the amplification region comprises:
the control module adjusts the driving module to output the driving voltage of the saturation region through the driving voltage adjusting module, the width of the control pulse is increased every other first preset time until receiving the synchronous detection signal output by the synchronous detection module, and the control module obtains the width of the current control pulse and stops outputting the control pulse; and
after the second preset time, the control module adjusts the driving module to output the driving voltage of the amplification area through the driving voltage adjusting module, and increasing the width of the control pulse every other the first preset time from the acquired width of the current control pulse until receiving a synchronous detection signal output by the synchronous detection module, the control module obtains the duration T from the time when the driving module outputs the driving voltage of the amplification area to the time when the synchronous detection signal output by the synchronous detection module is received or the number N of control pulses output from the time when the driving module outputs the driving voltage of the amplification area to the time when the synchronous detection signal output by the synchronous detection module is received, and judging whether the driving voltage regulating branch circuit has faults or not according to the duration T or the number N of the control pulses.
8. The fault detection method according to claim 7, wherein the control module judges that the driving voltage regulation branch is faulty when the duration T is less than or equal to a first time threshold T1 or a difference between the duration T and a width of the obtained current control pulse is less than or equal to a second time threshold T.
9. The method of claim 8, wherein T1 is greater than or equal to 2(T1+ T2), and T is greater than or equal to 0.1 μ sec, wherein T1 is the first preset time, and T2 is the width of the obtained current control pulse.
10. The fault detection method according to claim 7, wherein when the number N of the control pulses is less than or equal to a preset threshold N1, the control module determines that the driving voltage regulation branch is faulty.
11. The fault detection method of claim 10, wherein n1 is an integer greater than or equal to 2.
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