CN210007926U - heating control circuit and electromagnetic heating device with same - Google Patents
heating control circuit and electromagnetic heating device with same Download PDFInfo
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- CN210007926U CN210007926U CN201920206193.4U CN201920206193U CN210007926U CN 210007926 U CN210007926 U CN 210007926U CN 201920206193 U CN201920206193 U CN 201920206193U CN 210007926 U CN210007926 U CN 210007926U
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Abstract
The utility model provides an heating control circuit and electromagnetic heating device who has it, heating control circuit includes the resonance heating module, the rectification filter module carries out rectification filter to alternating current power supply and handles, zero crossing detection module for detecting alternating current power supply's zero crossing point and output zero crossing signal, power switch tube, be used for controlling resonance heating module work, power switch tube drive circuit, drive vary voltage circuit, with zero crossing detection module is connected, by zero crossing signal switch-on, main control module, with zero crossing detection module, power switch tube drive circuit link to each other, main control module to power switch tube drive circuit sends drive signal, when drive vary voltage circuit turn-off and switch-on, drive signal drive power switch tube opens and cuts off respectively under different voltages, person's voltage is 1/3 ~ 4/5 of another person's voltage, the utility model discloses make power switch tube's switching-on current reduce, reduce the harm that hard switching-on brought.
Description
Technical Field
The utility model belongs to the technical field of electromagnetic heating, concretely relates to kinds of heating control circuit and electromagnetic heating device who has this heating control circuit.
Background
At present, most of induction cookers operate by using an electromagnetic resonance circuit of a single IGBT (Insulated Gate Bipolar Transistor), and usually adopt a parallel resonance mode. The current industry has the following problems: when the induction cooker works, transient current can be generated at the moment of switching on the IGBT, and under certain extreme conditions, the transient current can be large and exceeds the bearing capacity of the IGBT, so that the IGBT is damaged; when the IGBT is turned on, noise is generated, so that the IGBT generates heat seriously, and the heat dissipation of the IGBT (such as increasing a heat dissipation sheet, increasing the rotating speed of a fan and the like) needs to be enhanced so as to realize the temperature rise requirement of the IGBT; due to the existence of the filter capacitor, the IGBT is hard to turn on when being turned on, and the IGBT is easy to burn out.
The typical scheme is that a zero-crossing detection module detects a zero-crossing signal and sends the zero-crossing signal to a main control chip, the main control chip judges target power, when the target power is smaller than preset power (namely the target power works in a low-power state), the main control chip controls a driving transformation circuit to work, at the moment, each period enters three stages, namely a discharging stage, a heating stage and a stopping stage, the main control chip controls the driving transformation circuit to change the voltage of the IGBT into th driving voltage in the discharging stage, and controls the IGBT to work under the driving of second driving voltage when the voltage of a collector electrode of the IGBT oscillates to the minimum, so that the IGBT is transformed and started, the risk of damage of the IGBT is reduced, and the turn-on noise is reduced.
However, the method has the disadvantages that avoids the situation that the pulse current of the IGBT is too large and the turn-on loss is large when high power cannot be achieved, secondly, the software resource of the driving voltage controlled by the main control chip has higher requirement and occupies more software resources, and thirdly, the reliability of level conversion is low by the software mode.
Therefore, the reliability is strong, the performance is stable, the pair contradiction is less compared with the occupied resource, and it is very important to reduce the occupied software or hardware resource, reduce the cost and realize the simple and reliable low-power driving of the IGBT under the conditions of ensuring the circuit reliability and reducing the damage risk of the IGBT.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides heating control circuits with simple structure and convenient use.
The utility model adopts the technical proposal that:
A heating control circuit for controlling heating of an electromagnetic heating device, comprising:
a resonant heating module;
the rectification filtering module is used for carrying out rectification filtering processing on the alternating current power supply;
the zero-crossing detection module is used for detecting the zero-crossing point of the alternating current power supply and outputting a zero-crossing signal;
the power switch tube is used for controlling the resonant heating module to perform resonant operation;
a power switching tube driving circuit;
the driving voltage transformation circuit is connected with the zero-crossing detection module and is conducted by a zero-crossing signal output by the zero-crossing detection module;
the main control module sends a driving signal to the power switch tube driving circuit, when the driving voltage transformation circuit is switched off, the driving signal drives the power switch tube to be switched on and switched off under a second driving voltage, when the driving voltage transformation circuit is switched on, the driving signal drives the power switch tube to be switched on and switched off under th driving voltage, the value of th driving voltage is 1/3-4/5 of the second driving voltage, when the driving voltage transformation circuit is switched off and switched on, the driving signal drives the power switch tube to be respectively switched on and switched off under different voltages, the zero-crossing detection signal is adopted to generate a hardware signal, low-power heating is achieved, compared with a mode of controlling 2 driving voltages through software, fewer software resources are occupied, IO ports are reduced, the scheme is simple, cost is saved, starting noise is reduced, and the use process is reliable.
Specifically, the zero-crossing detection module performs delay amplification on the zero-crossing signal before the zero-crossing point of the alternating-current power supply. The delayed amplification treatment makes the signal strength more obvious and the driving more reliable.
, at driving voltage, the power switch tube works in the amplifying area, at the second driving voltage, the power switch tube works in the saturation area, at the discharging stage, the driving voltage of the IGBT is reduced to driving voltage through the IGBT driving voltage transformation circuit, the IGBT works in the amplifying stage but not in the saturation stage, when the voltage of the IGBT collector is oscillated to the minimum, the IGBT heating stage is entered, at the moment, the IGBT driving voltage transformation circuit enables the IGBT driving voltage to be increased to the second driving voltage, and at the moment, the IGBT works in the saturation stage.
Specifically, the zero-crossing detection module rectifies the alternating-current power supply and then detects a zero-crossing point to obtain a zero-crossing signal. The zero-crossing signal obtained by processing the zero-crossing point of the rectified direct current signal is more reliable and has low cost.
Specifically, the driving transformation circuit comprises an th triode and a th triode, wherein a collector of the th triode is connected with a th triode, an emitter of the th triode is grounded, the th triode plays a role in switching, and a th triode stabilizes voltage to stabilize signals and is grounded to ensure potential.
Specifically, the power switch tube driving circuit is provided with a power supply module. The power supply module is a voltage source of the second driving voltage.
The second voltage-stabilizing tube is stably connected to the voltage of a pole of the power switch tube, so that the voltage of the power switch tube is stabilized at a value when the power switch tube is in overvoltage.
And , when the driving signal is at low level, the power module is conducted, and the reverse switching mode of low level conduction is an optimized scheme and is a more stable implementation mode.
Specifically, the output end of the driving signal is connected with the base electrode of a second triode, a third voltage-stabilizing tube is connected between the base electrode and the emitting electrode of the second triode in parallel, and the emitting electrode of the second triode is grounded. The second triode and the third voltage-regulator tube play the roles of switching and overvoltage protection on the driving signal.
In addition, electromagnetic heating devices are provided, which comprise the heating control circuit of the electromagnetic heating device, and the electromagnetic heating device comprises the heating control circuit, so that the functions of the heating control circuit are realized.
The beneficial effects of the utility model are that the utility model discloses an kinds of heating control circuit realize with vary voltage driven mode that the power switch tube starts to open when electromagnetic heating device heats for power switch tube's the electric current that opens reduces, can reduce the hard harm of opening and bringing of power switch tube, occupy the software resource less, have the multichannel protection, automatically controlled stable in structure is reliable, specifically as follows:
1. the IGBT is started and switched on in a voltage transformation driving mode, so that the switching-on current of the IGBT is reduced, and the damage caused by hard switching-on of the IGBT can be reduced;
2. the switching-on noise can be reduced, the serious heating of the IGBT is avoided, and the operation reliability of the electromagnetic heating device is improved;
3. software resources of a main control chip are not needed, the zero-crossing signal is a hardware signal, IO ports of the control chip are saved, cost is reduced, and reliability is improved;
4. and the IGBT driving voltage is changed through a hardware circuit, so that the reliability is high.
Drawings
Fig. 1 is a control flow block diagram of the main control module according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the overall control flow principle of the embodiment of the present invention.
Fig. 3 is a circuit diagram of the embodiment of the present invention, which includes a zero-cross detection module, a power switch tube driving circuit, a driving transformer circuit, and a main control module.
Fig. 4 is a waveform comparison diagram of the IGBT driving waveform, the IGBT C-voltage and the IGBT C-current when the zero-crossing signal is at the low level according to the embodiment of the present invention.
Fig. 5 is a waveform comparison diagram of PPG output, IGBT drive waveform, IGBT's C-pole voltage and C-pole current when the zero-crossing signal is at a high level according to an embodiment of the present invention.
Fig. 6 is a histogram of IGBT drive waveforms according to an embodiment of the present invention.
In the figure, 100-power switch tube, 200-zero-crossing detection module, 300-power switch tube driving circuit, 310-power module, 31-second triode, 32-third voltage regulator tube, 33-capacitor bank, 34-second voltage regulator tube, 400-driving transformation circuit, 41- th triode, 42- voltage regulator tube, 500-main control module, 60-resonant heating module and 70-rectifying filter module.
Detailed Description
The present invention is described in further detail with reference to specific embodiments , but the invention is not limited to these specific embodiments.
Example
Referring to fig. 1 to 6, heating control circuits are used for heating control of an electromagnetic heating device, and include a resonant heating module 60, a rectifying and filtering module 70, a zero-crossing detection module 200, a power switching tube 100, a power switching tube driving circuit 300, a driving transformation circuit 400, and a main control module 500.
The rectifying and filtering module 70 is used for rectifying and filtering the alternating current power supply and supplying the alternating current power supply to the resonant heating module 60 for working; the zero-crossing detection module 200 is configured to detect a zero-crossing point of the ac power supply, intercept an electrical signal of the zero-crossing point, and output a zero-crossing signal in the form of a level signal.
The power switch tube 100 is used for controlling the resonant heating module 60 to perform resonant operation, and the power switch tube 100 is preferably an IGBT.
The driving transformer circuit 400 is connected to the zero-crossing detection module 200, and is turned on by the zero-crossing signal output by the zero-crossing detection module 200.
The main control module 500 is connected with the zero-crossing detection module 200 and the power switching tube driving circuit 300, the main control module 500 sends a driving signal to the power switching tube driving circuit 300, the driving signal is preferably a PPG signal and has high level and low level which alternately appear periodically to drive the power switching tube 100 to be switched on and switched off, when the driving transformation circuit 400 is switched off, the driving signal drives the power switching tube 100 to be switched on and switched off at a second driving voltage, when the driving transformation circuit 400 is switched on, the driving signal drives the power switching tube 100 to be switched on and switched off at driving voltage, and therefore when the driving transformation circuit 400 is switched off and switched on, the power switching tube 100 is switched on and switched off at different driving voltages.
Specifically, the second driving voltage is larger than the th driving voltage, the value of the th driving voltage is 1/3-4/5 of the second driving voltage, and the value range of the th driving voltage is set to ensure that the switch-on can be carried out at the lower limit (the th driving voltage is 1/3 of the second driving voltage), and the negative effect caused by the switch-on of the th driving voltage relative to the second driving voltage is obviously reduced at the upper limit (the th driving voltage is 4/5 of the second driving voltage).
After the driving transformation circuit 400 is conducted by the zero-crossing signal output by the zero-crossing detection module 200, the power switching tube 100 is turned on at the th driving voltage, namely, the voltage reduction turning-on is performed, so that the turning-on overcurrent loss and the starting-up noise are reduced, and the reliability is improved.
When the driving transformer circuit 400 is turned off, the voltage of the power switch tube 100 turned on by the driving signal is the second driving voltage.
Specifically, the output end of the driving signal is connected with the base electrode of a second triode 31 after being connected with resistors R10 in series, the emitter electrode of the second triode 31 and R10 are connected with a third voltage regulator tube 32 in parallel, the emitter electrode of the second triode 31 is grounded, the voltage-stabilized voltage of the third voltage regulator tube 32 is 5V, the voltage-stabilized voltage of the third voltage regulator tube 32 is connected with the end of a resistor R11 before the connection point of the third voltage regulator tube 32 and the R10 after the output end of the driving signal, the power switch tube driving circuit 300 is provided with a power module 310, the voltage of the power module 310 is 18V, the other end of the resistor R11 is connected with the power module 310, the power module 310 is further connected with ends of a capacitor group 33 and resistors R9, the capacitor group 33 comprises a capacitor C300 and a capacitor C301 which are connected in parallel, wherein the capacitor C300 is a polar capacitor, the positive electrode of the power module 310 is connected with;
the power switch tube driving circuit 300 further comprises a triode Q and a triode Q, wherein the second triode 31 and the triode Q are NPN triodes, the triode Q is a PNP triode, a collector of the second triode 31 is connected to a base of the triode Q, an emitter of the triode Q is connected to an emitter of the triode Q, the other end of the resistor R is connected to a base of the triode Q and a base of the triode Q, a collector of the triode Q is connected to ends of resistors R and R connected in parallel, the other ends of the resistors R and R are connected to a power supply module, a collector of the triode Q is connected to ends of the resistors R and R connected in parallel, the other ends of the resistors R and R are grounded, the emitter of the triode Q and the emitter of the triode Q are connected in series, the end of the resistor R is also connected in series, and the other end of the resistor R is connected to the pole of the power switch.
The power switch tube driving circuit 300 is connected in parallel with a second voltage regulator tube 34 and a resistor R1 between the pole and the emitter of the power switch tube 100, the voltage-stabilized voltage of the second voltage regulator tube 34 is 18V, and the emitter of the power switch tube 100 is grounded.
Specifically, the output end of the zero-crossing signal of the driving transformation circuit 400 is connected with resistors R6 in series and then is connected with the base electrode of a third-order tube 41, a resistor R5 is connected between the base electrode and the emitter electrode of the third-order tube 41 in parallel, the emitter electrode of the third-order tube 41 is grounded, the collector electrode of the third-order tube 41 is connected with the end of a voltage-regulator tube 42, and the other end of the voltage-regulator tube 42 is connected with the electrode of the power switch tube 100.
As an implementation, the power switch 100 operates in the amplification region at the driving voltage, and the power switch 100 operates in the saturation region at the second driving voltage.
As embodiments, the power module 310 is turned on when the driving signal is at a low level, the low level conduction mode corresponds to the circuit of the present embodiment, and the high level conduction mode can be selected according to actual conditions.
As embodiments, the zero-crossing detection module 200 rectifies an ac power to obtain a dc signal, and generally adopts two diodes to perform full-wave rectification, and then detects a zero-crossing point of the dc signal to obtain a zero-crossing signal.
The circuit working principle is that the master control module 500 controls and sends a driving signal to the power switch tube driving circuit 300, the period of the driving signal is about 0.05ms, the power switch tube driving circuit 300 in the embodiment is switched off when the driving signal is at a high level, the 18V power supply module is switched on when the power switch tube driving circuit 300 is switched off and does not work, the 18V power supply module 310 is switched on when the driving signal is at a low level, and finally the voltage is input to the IGBT through the resistor R2, meanwhile, the zero-crossing detection module 200 continuously detects the rectified direct current signal obtained by processing of the rectifying and filtering module and outputs a zero-crossing signal to the driving transformation circuit 400, the period of the zero-crossing signal is about 2-3 ms, namely, the zero-crossing signal passes through a plurality of driving signals within the duration time of the high level or the low level of zero-crossing signals, the driving transformation circuit 400 is switched on when the zero-crossing signal is at a high level, the voltage is stabilized through the voltage regulator 41, so that the power switch tube inputs 9V driving voltage when the working condition of the IGBT is determined by the driving circuit and the power switch tube driving circuit 300 is switched off when the zero-crossing signal is at the high level.
When the zero-crossing signal is at a high level and the driving transformation circuit 400 is on, if the PPG signal (driving signal) is at a high level, the power switch tube driving circuit 300 is turned off, the 18V power module 310 is turned off, the system is in a turned-off state, the zero-crossing signal does not work, and the driving waveform of the IGBT is at a low level, if the PPG signal is at a low level, the power switch tube driving circuit 300 is turned on, the 18V power module 310 is turned on, the zero-crossing signal works, the IGBT driving waveform is at a high level, and the IGBT works at the th driving voltage of 9V.
When the zero-crossing signal is at a low level and the driving transformation circuit 400 is disconnected, the power switching tube driving circuit 300 acts alone, the 18V power module is disconnected when the PPG signal is at a high level, and the IGBT driving waveform is at a low level; and when the PPG signal is at a low level, the 18V power module is switched on, the IGBT driving waveform is at a high level, and the IGBT works under a second driving voltage of 18V.
In addition, based on the above circuits and control methods, electromagnetic heating devices including the heating control circuit of the above electromagnetic heating device have been developed, and the electromagnetic heating device including the above heating control circuit realizes the functions of the heating control circuit, and specifically may be an electromagnetic oven, or an electromagnetic heating-based household appliance, such as an electromagnetic rice cooker, an electromagnetic pressure cooker, and the like.
The heating control principle is as follows:
in each control period, the electromagnetic heating device is controlled to enter a discharging stage and a heating stage in sequence, wherein in the discharging stage, the driving voltage of the IGBT is reduced to th driving voltage through the driving transformation circuit 400, so that the IGBT works in an amplification region, when the voltage oscillation of the collector electrode of the IGBT is minimum, the electromagnetic heating device enters the heating stage, the driving voltage of the IGBT is increased to a second driving voltage through the power switch tube driving circuit 300, at the moment, the IGBT works in a saturation region and works normally, when the next working period is reached, the electromagnetic heating device enters the discharging stage and the heating stage firstly, and the steps are repeated, and the specific steps are as follows:
the zero-crossing detection module 200 processes the zero-crossing signal (such as delay amplification) before the zero-crossing point of the ac power supply, so as to control the driving transformation circuit 400 to make the IGBT operate under the drive of the th driving voltage, and to drive the transformation circuit 400 to stop operating when the voltage oscillation of the collector of the IGBT reaches the minimum, so as to make the IGBT operate under the drive of the second driving voltage, which is greater than the th driving voltage.
Fig. 6 shows a driving developed waveform of the IGBT, wherein duty cycles of the power switching tube 100 include a time t1 and a second time t2 that are sequentially connected, t1 is a discharging phase, t2 is a heating phase, and t1 is significantly shorter than t2, since a zero-crossing signal is obtained by cutting segments near a zero-crossing point of the rectified dc signal, preferably, at t1, an amplitude of the -th driving voltage is not changed, a pulse width of the -th driving voltage is increased or equal, at t2, an amplitude of the second driving voltage is not changed, and a pulse width of the second driving voltage is increased or equal, when the main control module 500 sends a driving signal to the power switching tube driving circuit 300, the main control module 500 refers to the zero-crossing signal received by the main control module 500 first, so as to avoid a mismatch between the driving transformer circuit 400 and the power switching tube driving circuit 300 when operating, and ensure that each cycle enters the discharging phase first, and then enters the heating phase, t1 is a time period when the zero-crossing signal is at a high level, and t2 is a time period at a.
The driving voltage transformation circuit of the scheme only depends on the zero-crossing detection module to send a hardware signal, and the zero-crossing detection module controls the driving voltage transformation circuit no matter what state the machine is in, so that the reliability can be improved, the IO port of a control chip is saved, and the cost is reduced.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing has been a detailed description of the preferred embodiments and principles of the present invention, and it will be apparent to those skilled in the art that variations may be made in the specific embodiments based on the concepts of the present invention, and such variations are considered as within the scope of the present invention.
Claims (10)
- A heating control circuit of kind for heating control of an electromagnetic heating device, comprising:a resonant heating module;the rectification filtering module is used for carrying out rectification filtering processing on the alternating current power supply;the zero-crossing detection module is used for detecting the zero-crossing point of the alternating current power supply and outputting a zero-crossing signal;the power switch tube is used for controlling the resonant heating module to perform resonant operation;a power switching tube driving circuit;the driving voltage transformation circuit is connected with the zero-crossing detection module and is conducted by a zero-crossing signal output by the zero-crossing detection module;the main control module sends a driving signal to the power switch tube driving circuit, the driving signal drives the power switch tube to be switched on and switched off under a second driving voltage when the driving transformation circuit is switched off, the driving signal drives the power switch tube to be switched on and switched off under an th driving voltage when the driving transformation circuit is switched on, and the value of the th driving voltage is 1/3-4/5 of the second driving voltage.
- 2. The heating control circuits according to claim 1, wherein the zero-crossing detection module delays the zero-crossing signal before the zero-crossing of the AC power source.
- 3. The heating control circuit of claim 1, wherein the power switch tube operates in an amplification region at a driving voltage and operates in a saturation region at a second driving voltage.
- 4. The heating control circuits according to claim 1, wherein the zero-crossing detection module rectifies the AC power supply and detects zero-crossing points to obtain the zero-crossing signal.
- 5. The heating control circuits according to claim 1, wherein the driving transformer circuit comprises a th triode and a th triode, and the th triode has a collector connected to a th triode and an emitter connected to ground.
- 6. The heating control circuits of claim 1, wherein the power switch tube driver circuit has a power module.
- 7. The heating control circuit of claim 1, wherein the power switch tube driver circuit is connected in parallel with a second voltage regulator tube between the pole and the emitter of the power switch tube.
- 8. The heating control circuits of claim 6, wherein the power module is turned on when the driving signal is at a low level.
- 9. The heating control circuit according to claim 1, wherein the output terminal of the driving signal is connected to the base of the second triode, a third voltage regulator is connected between the base and the emitter of the second triode in parallel, and the emitter of the second triode is grounded.
- 10, electromagnetic heating device, characterized by comprising heating control circuits according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920206193.4U CN210007926U (en) | 2019-02-18 | 2019-02-18 | heating control circuit and electromagnetic heating device with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920206193.4U CN210007926U (en) | 2019-02-18 | 2019-02-18 | heating control circuit and electromagnetic heating device with same |
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| Publication Number | Publication Date |
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| CN210007926U true CN210007926U (en) | 2020-01-31 |
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| CN201920206193.4U Active CN210007926U (en) | 2019-02-18 | 2019-02-18 | heating control circuit and electromagnetic heating device with same |
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Effective date of registration: 20230816 Address after: No. 999, Mei Li Road, Huaiyin District, Ji'nan, Shandong Patentee after: Shandong Jiuchuang Home Appliance Co.,Ltd. Address before: No. 999, Mei Li Road, Huaiyin District, Ji'nan, Shandong Patentee before: JOYOUNG Co.,Ltd. |
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