WO2016123897A1 - 电磁加热控制电路及电磁加热设备 - Google Patents
电磁加热控制电路及电磁加热设备 Download PDFInfo
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- WO2016123897A1 WO2016123897A1 PCT/CN2015/082969 CN2015082969W WO2016123897A1 WO 2016123897 A1 WO2016123897 A1 WO 2016123897A1 CN 2015082969 W CN2015082969 W CN 2015082969W WO 2016123897 A1 WO2016123897 A1 WO 2016123897A1
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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
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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
- H05B6/04—Sources of current
Definitions
- the invention relates to the field of electromagnetic heating technology, in particular to an electromagnetic heating control circuit and an electromagnetic heating device.
- the existing electromagnetic heating control circuit requires detection of the input AC power source, and the entire system power of the electromagnetic heating device is controlled by using the control chip/controller to detect the voltage at the input end of the rectifying and filtering circuit.
- a voltage sampling circuit is generally provided at the input end of the rectifying and filtering circuit for voltage detection.
- the current voltage sampling circuit has a complicated structure, which results in a very high cost of circuit design and also causes high power consumption.
- the main object of the present invention is to provide an electromagnetic heating control circuit and an electromagnetic heating device aiming at reducing the cost and power consumption of the circuit design.
- the present invention provides an electromagnetic heating control circuit including a control chip 10, a rectifying and filtering circuit 20, a resonant capacitor C, a switching transistor Q, a driving circuit 30, and a synchronous voltage detecting circuit, wherein the switching transistor Q includes a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication, wherein the first end is connected to a positive output end of the rectifying and filtering circuit 20 through a resonant capacitor C, The second end is connected to the negative output end of the rectifying and filtering circuit 20 through a current limiting resistor R11; the control chip 10 includes an in-phase voltage input end, an inverting voltage input end, a voltage detecting end, and a signal output end; The in-phase voltage input terminal and the inverting voltage input terminal detect a voltage across the resonant capacitor C through the synchronous voltage detecting circuit, and the signal output terminal is connected to the control terminal through the driving circuit 30; the voltage
- the synchronous voltage detecting circuit includes: a first voltage sampling circuit, one end of the first voltage sampling circuit is connected to a positive output end of the rectifying and filtering circuit 20, and the other end is Connected to the non-inverting voltage input terminal; the second voltage sampling circuit, the input end of the second voltage sampling circuit is connected to the first end of the switch tube Q, the first output end is connected to the inverting voltage input end, and the second The output terminal is connected to the voltage detecting terminal.
- the first voltage sampling circuit includes a first zero resistor R10 and a first two resistor R12, one end of the first zero resistor R10 is connected to the positive output end of the rectifying and filtering circuit 20, and the other end is grounded through the first two resistor R12; the first zero resistor R10 and the first two resistor a common terminal between R12 is connected to the in-phase voltage input terminal; the second voltage sampling circuit includes a first three-resistor R13 and a first four-resistor R14, one end of the first three-resistor R13 and the switch tube Q The first end of the first three resistor R13 is grounded through the first four resistor R14, and the common end between the first three resistor R13 and the first four resistor R14 is connected to The inverting voltage input terminal.
- the driving circuit 30 includes a driving chip 31, a first five resistor R15, a first six resistor R16, and a first seven resistor R17, wherein the driving input end of the driving chip 31 passes the first
- the fifth resistor R15 is connected to the signal output end, and the driving input end is connected to the preset power source.
- the driving output end of the driving chip 31 is connected in series through the first six resistors R16 and the first seven resistors R17.
- the second end of the switch tube Q is connected; the common end of the first six resistor R16 and the first seven resistor R17 is connected to the control end of the switch tube Q.
- the driving circuit 30 further includes a Zener diode D, a cathode of the Zener diode D is connected to the control terminal, and an anode is connected to the second end of the switching transistor Q.
- the rectifying and filtering circuit 20 includes a rectifier bridge stack 21, an inductor L0, and a capacitor C12, wherein a positive output terminal of the rectifier bridge stack 21 is connected to the resonant capacitor C through the inductor L0.
- the negative output terminal of the rectifier bridge stack 21 is connected to the second end of the switch transistor Q through the current limiting resistor R11; one end of the capacitor C12 is connected to the common end of the inductor L0 and the resonant capacitor C, and the other end Connected to the negative output of the rectifier bridge stack 21.
- the switch transistor Q is an insulated gate bipolar transistor, the first end is a collector of the insulated gate bipolar transistor, and the second end is the insulated gate The emitter of the bipolar transistor, the control terminal being the gate of the insulated gate bipolar transistor.
- the voltage detecting end of the control chip is directly connected to the output end of the rectifying and filtering circuit, that is, the voltage detecting end of the control chip is connected to the output end of the rectifying and filtering circuit through the first sampling circuit of the synchronous circuit, thereby being able to be rectified according to the rectification Power control at the output of the filter circuit and mains undervoltage and overvoltage protection.
- the present invention utilizes a synchronous voltage detecting circuit to detect the voltage at the output end of the rectifying and filtering circuit, and performs power control and the city. Electrical undervoltage and overvoltage protection, thus reducing the cost and power consumption of the circuit design.
- the invention provides an electromagnetic heating control circuit including a driving circuit, a protection circuit and a switch tube; wherein
- the switch tube has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving circuit, and the second end is connected to the ground end connection;
- the driving circuit is connected to a preset control chip, and the pulse width modulation signal received by the control chip is received And outputting to the switch tube through the signal output end of the driving circuit to drive the switch tube;
- the driving circuit is configured to detect an output voltage level of the signal output end, and adjust a state in which the signal output end outputs the pulse width modulation signal according to whether the output voltage level of the signal output end belongs to a preset interval range;
- the protection circuit is configured to control an operating state of the switch tube according to a voltage level of the first end when the switch tube is turned off; or the protection circuit is configured to detect the second end of the switch tube when the switch tube is turned on The current magnitude controls the operating state of the switch.
- the adjusting circuit adjusts, according to the output voltage of the signal output end, the state in which the signal output end outputs the pulse width modulation signal comprises:
- the driving circuit controls the pulse width modulation signal that the signal output end stops outputting
- the driving circuit outputs a control signal to the control chip, so that the control chip stops outputting the pulse width modulation signal.
- the driving circuit is further configured to compare the received pulse width modulation signal with a preset reference square wave signal, and adjust a state of the pulse width modulation signal output by the signal output end according to the comparison result. .
- the switch transistor is an insulated gate bipolar transistor
- the first end is a collector of the insulated gate bipolar transistor
- the second end is an emitter of the insulated gate bipolar transistor
- the control terminal is a gate of the insulated gate bipolar transistor.
- the driving circuit is further configured to detect a voltage between a collector and an emitter of the insulated gate bipolar transistor, and when the insulated gate bipolar transistor is turned on, the insulating gate according to an opening instant
- the voltage between the collector and the emitter of the bipolar transistor determines an operating state of the insulated gate bipolar transistor, and adjusts a time during which the output voltage of the signal output rises to a second predetermined value according to the operating state.
- the working state includes starting, hard opening and normal;
- the adjusting the time when the output voltage of the signal output terminal rises to the second preset value according to the working state includes:
- the time when the voltage of the signal output terminal rises to the second preset value is a first threshold
- the time when the voltage of the signal output rises to the second preset value is a second threshold
- the time when the voltage of the signal output terminal rises to the second preset value is a third threshold
- the protection circuit when the protection circuit is configured to control an operating state of the switch tube according to a voltage level of the first end when the switch tube is turned off, the protection circuit includes a voltage sampling circuit and a comparator,
- the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor; the non-inverting input of the comparator Connected to the common terminal of the first resistor and the second resistor, inverting input
- the terminal is connected to the preset reference voltage terminal, and the output terminal is connected to the control terminal.
- the protection circuit is configured to detect a current state of the second end when the switch tube is turned on, and when the working state of the switch tube is controlled, the electromagnetic heating control circuit further includes a serial connection to the second end. And a third resistor between the ground and a voltage detecting end of the protection circuit connected to the second end to detect a current magnitude of the second end.
- the protection circuit is connected to the driving circuit, and when detecting that the current of the second end is greater than a preset value, outputting a control signal to the driving circuit, wherein the driving circuit controls the signal output
- the terminal outputs a preset level signal to turn off the switch.
- the protection circuit is connected to the control chip, and when detecting that the current of the second end is greater than a preset value, outputting a control signal to the control chip, for the control chip to adjust the output to the The duty cycle of the pulse width modulated signal of the drive circuit.
- the present invention also provides a home appliance, the home appliance including an electromagnetic heating control circuit, the electromagnetic heating control circuit including a driving circuit, a protection circuit, and a switch tube;
- the switch tube has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving circuit, and the second end is connected to the ground end connection;
- the driving circuit is connected to the preset control chip, and amplifies the pulse width modulation signal received by the control chip and outputs the signal to the switch through the signal output end of the driving circuit to drive the switch tube. ;
- the driving circuit is configured to detect an output voltage level of the signal output end, and adjust a state in which the signal output end outputs the pulse width modulation signal according to whether the output voltage level of the signal output end belongs to a preset interval range;
- the protection circuit is configured to control an operating state of the switch tube according to a voltage level of the first end when the switch tube is turned off; or the protection circuit is configured to detect the second end of the switch tube when the switch tube is turned on The current magnitude controls the operating state of the switch.
- the embodiment of the present invention controls the working state of the switch tube according to the voltage of the first end when the switch tube is turned off by setting the protection circuit; and controls the work of the switch tube according to the current level of the second end when the switch tube is turned on. status. Therefore, the voltage between the first end and the second end of the switch tube in the off state is effectively prevented from being damaged, thereby damaging the switch tube.
- the driving circuit outputs the state of the pulse width modulation signal according to the voltage control signal output end of the signal output end, thereby effectively preventing the driving voltage of the switching tube from being too high, causing the switching tube to burn out, and the driving voltage of the switching tube is too low.
- the switch cannot be turned on or is zoomed in. Therefore, the electromagnetic heating control circuit provided by the present invention improves the stability of the circuit operation.
- the present invention provides an electromagnetic heating circuit including a coil, a resonant capacitor, a control chip, a driving module, a protection module, and a switch tube;
- the coil is connected in parallel with the resonant capacitor
- the switch tube has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving module, and the first end is connected to One end of the resonant capacitor is connected, and the second end is connected to the ground end;
- the control chip is configured to output a pulse width modulation signal to the driving module, and the pulse width modulation signal is output to the switching tube through a signal output end of the driving module to drive the switching tube;
- the protection module is configured to control an operating state of the switch tube according to a voltage level of the first end when the switch tube is turned off; or the protection module is configured to detect the second end of the switch tube when the switch tube is turned on The current magnitude controls the operating state of the switch.
- the protection module when the protection module is configured to control an operating state of the switch tube according to a voltage level of the first end when the switch tube is turned off, the protection module includes a voltage sampling circuit and a comparator,
- the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor; the non-inverting input of the comparator Connected to the common terminal of the first resistor and the second resistor, the inverting input terminal is connected to the preset reference voltage terminal, and the output terminal is connected to the control terminal.
- the protection module when the protection module is configured to control an operating state of the switch tube according to a voltage level of the first end when the switch tube is turned off, the protection module includes a voltage sampling circuit and a comparator,
- the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor;
- the non-inverting input of the comparator Connected to the common end of the first resistor and the second resistor, the inverting input terminal is connected to the preset reference voltage terminal, and the output terminal is connected to the driving module;
- the comparator When the voltage of the first end is greater than a preset reference voltage, the comparator outputs a control signal to the driving module, and the driving module outputs a preset level signal according to the output of the control signal, so that the switch The tube is opened.
- the protection module when the protection module is configured to control an operating state of the switch tube according to a voltage level of the first end when the switch tube is turned off, the protection module includes a voltage sampling circuit and a comparator,
- the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor;
- the non-inverting input of the comparator Connected to the common end of the first resistor and the second resistor, the inverting input terminal is connected to the preset reference voltage terminal, and the output terminal is connected to the control chip;
- the comparator When the voltage of the first terminal is greater than a preset reference voltage, the comparator outputs a control signal to the control chip, so that the control chip adjusts a duty ratio of a pulse width modulation signal outputted to the driving module .
- the protection module is configured to detect a current level of the second end when the switch tube is turned on, and when the working state of the switch tube is controlled, the electromagnetic heating circuit further includes a serial connection to the second end The third resistor between the ground terminals, the voltage detecting end of the protection module is connected to the second end to detect the current of the second end.
- the protection module is connected to the driving module, and when detecting that the current of the second end is greater than a preset value, outputting a control signal to the driving module, wherein the driving module controls the signal output
- the terminal outputs a preset level signal to turn off the switch.
- the protection module is connected to the control chip, and when detecting that the current of the second end is greater than a preset value, outputting a control signal to the control chip, so that the control chip adjusts the output to the The duty cycle of the pulse width modulated signal of the drive module.
- the electromagnetic heating circuit further includes a temperature sensor for detecting the temperature of the switch tube, the temperature sensor is connected to the protection module, and the protection module outputs a control signal to the temperature according to the temperature detected by the temperature sensor.
- the driving module or the control chip wherein the driving module or the control chip adjusts a duty ratio of the signal output terminal to output a pulse width modulation signal according to the control signal or turns off the switching tube.
- the switch transistor is an insulated gate bipolar transistor
- the first end is a collector of the insulated gate bipolar transistor
- the second end is an emitter of the insulated gate bipolar transistor
- the control terminal is a gate of the insulated gate bipolar transistor.
- the working state of the switch tube is controlled according to the voltage of the first end when the switch tube is turned off; and the work of the switch tube is controlled according to the current level of the second end when the switch tube is turned on. status. Therefore, the voltage between the first end and the second end of the switch tube in the off state is effectively prevented from being damaged and the switch tube is damaged. Therefore, the electromagnetic heating circuit provided by the present invention improves the stability of the circuit operation.
- the present invention provides an electromagnetic heating circuit including a control chip, a driving module, and a switch tube;
- the switch tube has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving module;
- the control chip is configured to output a pulse width modulation signal to the driving module, and the pulse width modulation signal is output to the switching tube through a signal output end of the driving module to drive the switching tube;
- the driving module is configured to detect an output voltage level of the signal output end, and adjust a state in which the signal output end outputs the pulse width modulation signal according to whether the output voltage level of the signal output end belongs to a preset interval range.
- the driving module is further configured to compare the received pulse width modulation signal with a preset reference square wave signal, and adjust a state of the pulse width modulation signal output by the signal output end according to the comparison result. .
- the driving module adjusts a state of the pulse width modulation signal output by the signal output end according to the comparison result, including:
- the driving The moving module controls the pulse width in the corresponding period of the pulse width modulation signal outputted by the signal output end to be adjusted to the pulse width of the reference square wave signal, or controls the pulse width modulation signal in which the signal output end stops outputting;
- the driving module outputs a control signal to the control chip, so that the control chip adjusts the output to The state of the pulse width modulated signal of the drive module.
- the driving module adjusts, according to whether the output voltage level of the signal output end belongs to a preset interval range, the state in which the signal output end outputs the pulse width modulation signal comprises:
- the driving module controls the pulse width modulation signal that the signal output end stops outputting
- the driving module outputs a control signal to the control chip, so that the control chip stops outputting the pulse width modulation signal.
- control chip is an insulated gate bipolar transistor
- the first end is a collector of the insulated gate bipolar transistor
- the second end is an emitter of the insulated gate bipolar transistor
- the control terminal is a gate of the insulated gate bipolar transistor.
- the driving module is further configured to detect a voltage between a collector and an emitter of the insulated gate bipolar transistor, and when the insulated gate bipolar transistor is turned on, the insulating gate according to an opening instant
- the voltage between the collector and the emitter of the bipolar transistor determines an operating state of the insulated gate bipolar transistor, and adjusts a time during which the output voltage of the signal output rises to a second predetermined value according to the operating state.
- the working state includes starting, hard opening and normal;
- the adjusting the time when the output voltage of the signal output terminal rises to the second preset value according to the working state includes:
- the time when the voltage of the signal output terminal rises to the second preset value is a first threshold
- the time when the voltage of the signal output rises to the second preset value is a second threshold
- the time when the voltage of the signal output terminal rises to the second preset value is a third threshold
- the voltage detecting end of the driving module is connected to the collector of the insulated gate bipolar transistor, and the ground end is connected to the emitter of the insulated gate bipolar transistor.
- the present invention further provides an electronic device including an electromagnetic heating circuit, the electromagnetic heating circuit including a control chip, a driving module, and a switch tube;
- the switch tube has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving module;
- the control chip is configured to output a pulse width modulation signal to the driving module, and the pulse width modulation signal passes through the driving mode a signal output end of the block is output to the switch tube to drive the switch tube;
- the driving module is configured to detect an output voltage level of the signal output end, and adjust a state in which the signal output end outputs the pulse width modulation signal according to whether the output voltage level of the signal output end belongs to a preset interval range.
- control module is connected to the control chip and the switch tube, and the drive module outputs the state of the pulse width modulation signal according to the voltage control signal output end of the signal output end, thereby effectively preventing the driving voltage of the switch tube from being too high.
- the switch tube is burned out, and the driving voltage of the switch tube is too low, so that the switch tube cannot be opened or is in an enlarged state. Therefore, the embodiment of the invention improves the stability of the work of the switch tube.
- the present invention provides an electromagnetic heating control circuit including a switching tube, a temperature detecting module for collecting the temperature of the switching tube, a control chip for outputting a pulse width modulation signal, and a pair
- the pulse width modulation signal is driven and amplified, and then output to the driving circuit of the switch tube;
- the switch tube has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving circuit;
- the output end of the temperature detecting module is connected to the control chip
- the control chip is configured to acquire a temperature value currently detected by the temperature detecting module every first preset time period, and perform error correction according to the temperature value detected twice consecutively and the temperature compensation factor to calculate the currently detected temperature value. The actual temperature value afterwards; and controlling the operating state of the switch tube according to the actual temperature value.
- control chip is further configured to acquire a temperature value currently detected by the temperature detecting module every second preset time period, and according to the nth time collected temperature X n and the n-1th detected temperature value X n-1 calculates a temperature compensation factor A corresponding to the difference between the nth collected temperature X n and the n-1th detected temperature value X n-1 ; the temperature compensation factor A satisfies Where K is a constant and M is the temperature-compensated initial temperature.
- control chip is configured to acquire a temperature value currently detected by the temperature detecting module every first preset time period, and calculate a current detected temperature value according to the temperature value detected twice consecutively and the temperature compensation factor.
- the actual temperature value after error correction is specifically as follows:
- the control chip period every first preset temperature acquires the temperature detected by the detection module, and obtain the current detected temperature value X m and X m according to the temperature values detected on a currently detected temperature value X m-1 and the last detected temperature value X m-1 corresponding to the difference between the compensation factor a, X m according to the temperature value currently detected, the last detected temperature value X m-1, and calculates the actual compensation factor a
- the temperature detecting module includes a temperature sensor, a third one resistor, a third two resistor and a third capacitor, one end of the third resistor is connected to the first preset power source, and the other end is passed through the temperature sensor. Connected to the ground; One end of the third resistor is connected to the common end of the third resistor and the temperature sensor, and the other end is connected to the ground through a third capacitor. The common end of the third resistor and the third capacitor Connected to the temperature signal acquisition terminal of the control chip.
- the driving circuit comprises a driving integrated chip, a third three resistor, a first six resistor, a first five resistor, a first seven resistor and a third capacitor, wherein the pulse width modulation signal input terminal of the driving integrated chip Connected to the control chip through a third three resistor, the driving voltage input end is connected to the second preset power source, and the pulse width modulation signal output end is connected to the control end of the switch tube through the first six resistors; One end of the resistor is connected to the second preset power source, and the other end is connected to the common end of the third three resistor and the control chip; one end of the first six resistor is connected to the control end of the switch tube, The other end is connected to the second end of the switch tube; one end of the third capacitor is connected to the driving voltage input end, and the other end is connected to the ground end.
- the driving circuit further includes a Zener diode, an anode of the Zener diode is connected to a second end of the switching tube, and a cathode is connected to a control end of the switching tube.
- the switch transistor is an insulated gate bipolar transistor
- the first end is a collector of the insulated gate bipolar transistor
- the second end is an emitter of the insulated gate bipolar transistor
- the control terminal is a gate of the insulated gate bipolar transistor.
- the electric heating drive protection circuit further includes a buzzer circuit, and the buzzer circuit is connected to the control chip.
- the electromagnetic heating control circuit provided by the embodiment of the invention detects the temperature value of the switch tube by setting the temperature detecting module, and controls the working state of the switch tube according to the detected temperature and the preset temperature compensation factor, thereby preventing the switch tube from being over temperature
- the invention is high and burned out, so the invention improves the stability of the circuit operation.
- the present invention provides a surge protection circuit including a first voltage dividing circuit composed of a resistor and a capacitor, a rectifier circuit for rectifying a commercial power, and a surge. a protected control circuit; the control circuit comprising a first comparator;
- An input end of the first voltage dividing circuit is connected to an output end of the rectifier circuit, and an output end of the first voltage dividing circuit is connected to a first input end of the first comparator; the first comparator The second input end is connected to the preset first standard power source, and when the mains voltage is lower than the first preset value, when there is a forward surge, the voltage of the output end of the first voltage dividing circuit is greater than the first The voltage of a standard power source, when there is no forward surge, the voltage at the output of the first voltage dividing circuit is smaller than the voltage of the first standard power source; the control circuit performs the wave according to the state of the output level of the output of the first comparator Surge protection control.
- the first voltage dividing circuit comprises a first resistor, a second resistor and a first capacitor, one end of the first resistor Connected to the output end of the rectifier circuit, the other end is connected to the ground through the second resistor; the first capacitor is connected in parallel to both ends of the second resistor; the first input of the first comparator Connected to a common end of the first resistor and the second resistor.
- the surge protection circuit further includes a second voltage dividing circuit and a third voltage dividing circuit composed of a resistor and a capacitor, the control circuit further comprising a second comparator and a third comparator;
- An input end of the second voltage dividing circuit is connected to an output end of the rectifier circuit, an output end of the second voltage dividing circuit is connected to a first input end of the second comparator, and the second comparator
- the second input end is connected to the output end of the first voltage dividing circuit; and when the mains power does not have a forward surge voltage, the voltage of the output end of the first voltage dividing circuit is greater than the second point a voltage at an output end of the voltage circuit; when the mains has a forward surge voltage, a voltage at an output end of the first voltage dividing circuit is smaller than a voltage at an output end of the second voltage dividing circuit;
- An input end of the third voltage dividing circuit is connected to an output end of the rectifier circuit, and an output end of the third voltage dividing circuit is connected to a first input end of the third comparator, the third comparator
- the second input end is connected to the preset second standard power source for detecting a zero crossing of the mains, and when the output voltage of the third voltage dividing circuit is less than a second preset value, controlling the The output of the second comparator outputs a preset level signal.
- the second voltage dividing circuit comprises a third resistor, a fourth resistor and a second capacitor, one end of the third resistor is connected to an output end of the rectifier circuit, and the other end is connected to the ground through the fourth resistor An end connection; the second capacitor is connected in parallel to both ends of the fourth resistor; a first input end of the second comparator is connected to a common end of the third resistor and the fourth resistor.
- the third voltage dividing circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor and a fourth capacitor, one end of the fifth resistor being connected to the output end of the rectifier circuit, and the other end
- the sixth resistor and the seventh resistor are sequentially connected in series and connected to the ground end; the third capacitor is connected in parallel to both ends of the fifth resistor; and the fourth capacitor is connected in parallel to both ends of the seventh resistor a first input of the third comparator is coupled to a common terminal of the sixth resistor and the seventh resistor.
- the surge protection circuit further includes a fourth voltage dividing circuit composed of a resistor and a capacitor, and the control circuit further includes a fourth comparator;
- An input end of the fourth voltage dividing circuit is connected to an output end of the rectifier circuit, an output end of the fourth voltage dividing circuit is connected to a first input end of the fourth comparator, and the fourth comparator
- the second input end is connected to the output end of the second voltage dividing circuit; and when the mains power does not have a negative surge voltage, the voltage of the output end of the fourth voltage dividing circuit is smaller than the second point a voltage at an output end of the voltage circuit; when the mains has a negative surge voltage, a voltage at an output end of the fourth voltage dividing circuit is greater than a voltage at an output end of the second voltage dividing circuit;
- the third comparator is further configured to control when the output voltage of the third voltage dividing circuit is less than a second preset value
- the output of the fourth comparator outputs a preset level signal.
- the fourth voltage dividing circuit comprises an eighth resistor, a ninth resistor and a fifth capacitor, one end of the eighth resistor is connected to an output end of the rectifier circuit, and the other end is connected to the ground through the ninth resistor An end connection; the fifth capacitor is connected in parallel to both ends of the ninth resistor; a first input end of the fourth comparator is connected to a common end of the eighth resistor and the ninth resistor.
- the rectifier circuit comprises a first diode and a second diode, an anode of the first diode is connected to the first AC input terminal of the mains, and the second diode is The second alternating current input of the mains is connected, and the cathode of the first diode is connected to the cathode of the second diode.
- the first voltage dividing circuit performs voltage division, and the voltage after the voltage division is compared with the first standard voltage, and the utility power is determined to be close to zero according to the comparison result. Whether there is a forward surge voltage in the time period, when there is a forward surge voltage, the surge protection is performed by the control circuit. Since the invention realizes the surge detection in the time when the utility power is close to the zero point, thereby preventing the power consumption device from being damaged due to the surge phenomenon at the zero crossing point of the commercial power, the safety of the power supply is improved.
- FIG. 1 is a schematic view showing the circuit structure of a preferred embodiment of an electromagnetic heating control circuit of the present invention.
- FIG. 2 is a schematic diagram of a circuit connection structure of a first embodiment of an electromagnetic heating control circuit of the present invention
- FIG. 3 is a schematic diagram of a circuit connection structure of a second embodiment of an electromagnetic heating control circuit of the present invention.
- FIG. 4 is a schematic structural diagram of a circuit of a preferred embodiment of an electromagnetic heating circuit of the present invention.
- FIG. 5 is a schematic structural diagram of a circuit of a preferred embodiment of an electromagnetic heating circuit of the present invention.
- FIG. 6 is a schematic structural diagram of a circuit of an embodiment of an electromagnetic heating control circuit of the present invention.
- FIG. 7 is a schematic diagram showing the circuit structure of an embodiment of a surge protection circuit according to the present invention.
- the electromagnetic heating control circuit includes a control chip 10, a rectifying and filtering circuit 20, a resonant capacitor C, a switching transistor Q, a driving circuit 30, and a synchronous voltage detection. Circuit
- the switch tube Q includes a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication.
- the first end passes through the resonant capacitor C and the positive output end of the rectifying and filtering circuit 20 Connecting, the second end is connected to the negative output end of the rectifying and filtering circuit 20 through a current limiting resistor R11;
- the control chip 10 includes an in-phase voltage input terminal, an inverting voltage input terminal, a voltage detecting terminal, and a signal output terminal.
- the in-phase voltage input terminal and the inverting voltage input terminal detect the resonant capacitor C through the synchronous voltage detecting circuit.
- the signal output ends are connected to the control terminal through the driving circuit 30; the voltage detecting end is connected to the positive output end of the rectifying and filtering circuit 20 via the synchronous voltage detecting circuit, and the control chip 10 Controlling a state in which the switching transistor Q operates according to a voltage detected by the voltage detecting terminal, and controlling the switching transistor Q at the resonant capacitor C according to a voltage magnitude of the in-phase voltage input terminal and the inverting voltage input terminal When the voltage of the connection terminal of the switching transistor Q is zero volt, it is turned on.
- the control chip 10 acquires the state of the current mains voltage according to the voltage detected by the voltage detecting terminal, thereby further controlling the power of the electromagnetic heating device.
- the electromagnetic heating control circuit provided in this embodiment is mainly applied to an electromagnetic heating device.
- the electromagnetic heating device can be applied to equipment such as an induction cooker, a rice cooker, an electric pressure cooker, a soybean milk machine, and an electric kettle.
- the control chip 10 is provided with a comparator and an AD conversion module.
- the two input terminals of the comparator are the in-phase voltage input terminal and the inverting voltage input terminal, and the input terminal of the AD conversion module is the voltage detecting terminal.
- the above-mentioned resonant capacitor C is connected in parallel with the electromagnetic coil to constitute a parallel resonant circuit.
- the synchronous voltage detecting circuit is configured to detect the voltage across the resonant capacitor C, so that the control chip 10 controls the switching transistor Q to be turned on when the voltages across the resonant capacitor C are equal, thereby achieving zero-crossing conduction.
- the input end of the rectifying and filtering circuit 20 is connected to the commercial power grid. Since the voltage at the input end of the rectifying and filtering circuit 20 is proportional to the voltage at the output end, the voltage at the input end of the rectifying and filtering circuit 20 can be obtained by detecting the voltage at the output end of the rectifying and filtering circuit 20. Therefore, power control and mains undervoltage and overvoltage protection can be realized according to the voltage at the output end of the rectifying and filtering circuit 20.
- the voltage detecting end of the control chip 10 is directly connected to the output end of the rectifying and filtering circuit 20, that is, the voltage detecting end of the control chip 10 is connected to the output end of the rectifying and filtering circuit through the first voltage sampling circuit of the synchronizing circuit. Therefore, it can be controlled according to the power of the output end of the rectifying and filtering circuit 20 and the mains undervoltage and overvoltage protection.
- the present invention utilizes the synchronous voltage detecting circuit to detect the voltage at the output end of the rectifying and filtering circuit 20, and performs power. Control and mains undervoltage and overvoltage protection, thus reducing the cost and power consumption of the circuit design.
- the synchronous voltage detecting circuit includes a first voltage sampling circuit and a second voltage sampling circuit; one end of the first voltage sampling circuit and a positive output of the rectifying and filtering circuit 20 The terminal is connected, and the other end is connected to the non-inverting voltage input terminal.
- One end of the second voltage sampling circuit that is, the input end and the switch tube
- the first end of the Q is connected, and the other end, that is, the output end is connected to the inverting voltage input end, wherein the control chip 10 controls the switch tube according to the voltage magnitude of the in-phase voltage input terminal and the inverting voltage input terminal.
- Q is turned on when the voltage difference across the resonant capacitor C1 is zero.
- the first voltage sampling circuit and the second voltage sampling circuit may be configured according to actual needs.
- the first voltage sampling circuit includes a first zero resistor R10 and a first two resistor R12.
- One end of the first zero resistor R10 is connected to the positive output end of the rectifying and filtering circuit 20, and the other end is connected to the negative output end of the rectifying and filtering circuit 20 through the first two resistor R12, and the rectifying and filtering circuit is negative.
- the output is grounded.
- a common terminal between the first zero resistor R10 and the first two resistor R12 is connected to the in-phase voltage input terminal;
- the second voltage sampling circuit includes a first three resistor R13 and a first four resistor R14.
- One end of the first three resistor R13 is connected to the first end of the switch tube Q, and the other end of the first three resistor R13 passes through the first four resistor R14 and the negative output of the rectifying and filtering circuit 20
- the terminal is connected, the negative output end of the rectifier filter circuit is grounded, and a common terminal between the first three resistor R13 and the first four resistor R14 is connected to the non-inverting voltage input terminal.
- the resistance values and structures of the first zero resistor R10, the first two resistors R12, the first three resistors R13, and the first four resistors R14 may be set according to actual needs, as long as the switch tube Q can be detected. The zero crossing of the current at the first end is sufficient.
- the first zero resistor R10, the first two resistors R12, the first three resistors R13, and the first four resistors R14 are respectively composed of at least two resistors connected in series.
- the driving circuit 30 includes a driving chip 31, a first five resistor R15, a first six resistor R16, and a first seven resistor R17, wherein a driving input end of the driving chip 31 is connected to the signal output terminal through a first five resistor R15. And the driving input end is connected to the preset power supply VDD, and the driving output end of the driving chip 31 is connected in series to the second end of the switching tube Q through the first six resistors R16 and the first seven resistors R17. The common end of the first six resistor R16 and the first seven resistor R17 is connected to the control end of the switch tube Q.
- the signal output end of the control chip 10 is configured to output a pulse width modulation signal to the driving input end of the driving chip 31, and perform voltage and voltage on the pulse width modulation signal through the preset power supply VDD and the first five resistors R15. After the current is amplified, it is output through the drive output. After the pulse width modulation signal outputted by the driving output terminal is divided by the first six resistors R16 and the first seven resistors R17, the switching transistor Q is turned on and off according to the voltage across the first seven resistors R17.
- the model of the driving chip 31 can be set according to actual needs, as long as the pulse width modulation signal can be amplified by voltage and current and output to the control terminal of the switching transistor Q, the switching transistor Q can be turned on. .
- the specific structure of the switching transistor Q can also be set according to actual needs.
- the switching transistor Q is preferably an insulated gate bipolar transistor, and the first end is a collector of the insulated gate bipolar transistor. The second end is an emitter of the insulated gate bipolar transistor, and the control end is a gate of the insulated gate bipolar transistor.
- the protection device may be provided in this embodiment.
- the driving circuit further includes a Zener diode D, a cathode of the Zener diode D is connected to the control end, and an anode is connected to the second end of the switching tube Q.
- the gate of the insulated gate bipolar transistor can be used when the pulse width modulation signal is at a high level.
- the emitter is not greater than the voltage stabilized by the Zener diode.
- the rectifying and filtering circuit 20 includes a rectifying bridge stack 21, an inductor L0, and a capacitor C12.
- the positive output end of the rectifying bridge stack 21 is connected to the resonant capacitor C12 through the inductor L0, and the rectifying bridge stack 21 is negative.
- the output terminal is connected to the second end of the switch tube Q through the current limiting resistor R11; one end of the capacitor C12 is connected to the common end of the inductor L0 and the resonant capacitor C, and the other end is connected to the rectifier bridge stack 21 The negative output is connected.
- the electromagnetic heating control circuit includes a driving circuit 30, a protection circuit 120, and a switching transistor Q;
- the switch tube Q has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving circuit, and the second end is grounded End connection
- the driving circuit 30 is connected to the control chip 10, and amplifies the pulse width modulation signal received by the control chip 10 and outputs it to the switch tube Q through the signal output end of the driving circuit 10 to drive the Switch tube Q;
- the driving circuit 30 is configured to detect an output voltage level of the signal output end, and adjust a state in which the signal output end outputs the pulse width modulation signal according to whether the output voltage level of the signal output end belongs to a preset interval range;
- the protection circuit 120 is configured to control an operating state of the switch tube Q according to a voltage level of the first end when the switch tube Q is turned off; or the protection circuit 120 is configured to detect when the switch tube Q is turned on.
- the current magnitude of the second end controls the operating state of the switching transistor Q.
- the driving circuit provided in this embodiment is mainly used to implement driving control of the switching transistor Q.
- the structure of the switch tube Q can be set according to actual needs.
- the switch tube Q is preferably an insulated gate bipolar transistor (IGBT), and the first end is the insulated gate bipolar transistor. a collector, the second end is an emitter of the insulated gate bipolar transistor, and the control end is a gate of the insulated gate bipolar transistor.
- IGBT insulated gate bipolar transistor
- the first end of the switching transistor Q is connected to a parallel resonant circuit including a coil L and a resonant capacitor C.
- a parallel resonant circuit including a coil L and a resonant capacitor C.
- the switch tube Q When the switch tube Q is turned off, the coil L and the resonant capacitor C enter a state of energy storage, and the power is increased. At this time, the voltage between the first end and the second end of the switch tube Q will rise.
- the switch tube Q is turned on, the energy stored in the coil L and the resonant capacitor C will be released to reduce the voltage between the first end and the second end of the switch tube Q, and prevent the switch tube Q from being turned off after the switch tube Q is turned off. Excessive voltage between the terminal and the second terminal causes damage to the switching transistor Q.
- preventing the voltage of the first end and the second end of the switch tube Q from being too high may specifically detect the voltage level of the first end when the switch tube Q is turned off or detect the second end of the switch tube Q when the switch tube Q is turned on. Current size.
- the control switch tube Q When detecting the voltage of the first end when the switch tube Q is turned off, if the voltage of the first end is greater than the preset voltage when the switch tube Q is turned off, the control switch tube Q is turned on to prevent the switch tube Q from being turned on. The voltage at one end and the second end is too high to damage the switch tube Q.
- the maximum voltage of the switch tube Q after being turned off can be budgeted according to the current level of the second end of the switch tube Q.
- the control switch tube Q is turned off to prevent the switch tube Q from being turned off. After the voltage rises too high, the switch Q is damaged.
- the driving circuit 30 adjusts the state of outputting the pulse width modulation signal by the signal output end according to the output voltage of the signal output end, including:
- the driving circuit 30 controls the pulse width modulation signal that the signal output end stops outputting;
- the driving circuit 30 outputs a control signal to the control chip 10 for the control chip 10 to stop outputting the pulse width modulation signal.
- the size of the preset interval range may be set according to actual needs, and is not further limited herein as long as the switch tube Q can be driven and the switch tube Q is prevented from being burned out.
- the driving circuit 30 can detect the voltage of the signal input end by using a built-in voltage sampling circuit, and can also determine the voltage of the first end by using a comparator.
- the specific circuit form can be set according to actual needs, and is not used here. Further defined. It can be understood that when the output voltage of the signal output terminal does not belong to the preset interval range, the voltage of the signal output end of the driving circuit 30 can also be adjusted by the control chip 10 or the driving circuit 30, so that the size of the signal output end is stabilized. Belongs to the preset range.
- the output voltage of the signal output terminal is a gate driving voltage of the insulated gate bipolar transistor.
- the driving circuit 30 stops outputting the pulse width modulation signal to the gate of the insulated gate bipolar transistor (ie, is insulated)
- the gate voltage of the gate bipolar transistor is pulled low). Therefore, the gate driving voltage of the insulated gate bipolar transistor is prevented from being excessively high, resulting in damage to the insulated gate bipolar transistor.
- the embodiment of the present invention controls the working state of the switch tube Q according to the voltage level of the first end when the switch tube Q is turned off by setting the protection circuit 120; and controlling the current according to the current level of the second end when the switch tube Q is turned on.
- the working state of the switch tube Q Therefore, the voltage between the first end and the second end of the switch tube Q in the off state is effectively prevented from being damaged, and the switch tube Q is damaged.
- the pulse width adjustment is output by the driving circuit 30 according to the voltage control signal output end of the signal output end.
- the electromagnetic heating control circuit improves the stability of the circuit operation.
- the driving circuit 30 is further configured to compare the received pulse width modulation signal with a preset reference square wave signal, and adjust the location according to the comparison result. The state of the pulse width modulated signal output from the signal output.
- the reference square wave signal may be generated by the control chip 30 or by a square wave generating circuit, and the pulse width of the reference square wave signal is the maximum pulse width allowed to be output.
- the driving circuit 30 controls the pulse within the corresponding period of the pulse width modulation signal output by the signal output terminal.
- Width adjustment is a pulse width of the reference square wave signal, or a pulse width modulation signal that controls the signal output end to stop outputting;
- the driving circuit 30 outputs a control signal to the control chip 10 for the control chip. 10 adjusts the state of the pulse width modulation signal output to the drive circuit 30.
- the overcurrent, overvoltage, overheating, etc. of the insulated gate bipolar transistor are prevented due to the excessive conduction time of the insulated gate bipolar transistor. Improves the safety of insulated gate bipolar transistors.
- the driving circuit 30 is further configured to detect a voltage between a collector and an emitter of the insulated gate bipolar transistor, and when the insulated gate bipolar When the transistor is turned on, determining an operating state of the insulated gate bipolar transistor according to a voltage between a collector and an emitter of the insulated gate bipolar transistor according to the turn-on instant, and adjusting the signal output end according to the working state The time when the output voltage rises to the second preset value.
- the voltage detecting end of the driving circuit 30 is connected to the collector of the insulated gate bipolar transistor, and the ground end is connected to the emitter of the insulated gate bipolar transistor; thereby detecting the insulated gate bipolar type. The voltage between the collector and emitter of the transistor.
- the above working states include startup, hard opening, and normal;
- the adjusting the time when the output voltage of the signal output terminal rises to the second preset value according to the working state includes:
- the time when the voltage of the signal output terminal rises to the second preset value is a first threshold
- the time when the voltage of the signal output rises to the second preset value is a second threshold
- the time when the voltage of the signal output terminal rises to the second preset value is a third threshold
- the first cycle of the hard switch and the IGBT turn-on caused by the IGBT lead-on causes the resonant capacitor to rise sharply from the 0 voltage to the DC bus voltage (at 220V).
- the protection circuit 120 when the protection circuit 120 is configured to control the operating state of the switching transistor Q according to the voltage magnitude of the first terminal when the switching transistor Q is turned off, the protection circuit 120 includes a voltage. a sampling circuit and a comparator, the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor; The non-inverting input of the comparator is coupled to the common terminal of the first resistor and the second resistor, the inverting input terminal is coupled to the preset reference voltage terminal, and the output terminal is coupled to the control terminal.
- the switch tube Q when the switch tube Q is in the off state, when the voltage across the second resistor is less than the preset reference voltage of the preset reference voltage terminal (ie, the voltage between the first end and the second end is less than the preset voltage) When the switch Q is kept in the off state according to the pulse width modulation signal outputted by the signal output terminal; when the voltage across the second resistor is greater than the preset reference voltage of the preset reference voltage terminal (ie, the first end and the second end) When the voltage between them is greater than the preset voltage), the comparator will output a high level, so that the switching transistor Q is turned on, releasing the energy stored in the coil L and the resonant capacitor C.
- the protection circuit 120 when the protection circuit 120 is configured to control the operating state of the switching transistor Q according to the voltage magnitude of the first terminal when the switching transistor Q is turned off, the protection circuit 120 includes a voltage. a sampling circuit and a comparator, the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor; The non-inverting input end of the comparator is connected to the common end of the first resistor and the second resistor, the inverting input end is connected to the preset reference voltage end, and the output end is connected to the driving circuit 30;
- the comparator When the voltage of the first terminal is greater than a preset reference voltage, the comparator outputs a control signal to the driving circuit 30, and the driving circuit 30 outputs a preset level signal according to the output of the control signal, so that The switch tube Q is turned on.
- the switch tube Q when the switch tube Q is in the off state, when the voltage across the second resistor is less than the preset reference voltage of the preset reference voltage terminal (ie, the voltage between the first end and the second end is less than the preset voltage) When the switch Q is kept in the off state according to the pulse width modulation signal outputted by the signal output terminal; when the voltage across the second resistor is greater than the preset reference voltage of the preset reference voltage terminal (ie, the first end and the second end) When the voltage between the voltage is greater than the preset voltage), the comparator will output a high level signal to the driving circuit 30, so that the signal output terminal outputs a high level signal by the driving circuit 30, so that the switching transistor Q is turned on to release the coil L harmoniously. The energy stored on the oscillating capacitor C.
- the protection circuit 120 when the protection circuit 120 is configured to control the operating state of the switching transistor Q according to the voltage magnitude of the first terminal when the switching transistor Q is turned off, the protection circuit 120 includes a voltage. a sampling circuit and a comparator, the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other The end is connected to the ground through the second resistor; the non-inverting input of the comparator is connected to the common end of the first resistor and the second resistor, and the inverting input is connected to the preset reference voltage terminal, and the output is The terminal is connected to the control chip 10;
- the comparator When the voltage of the first terminal is greater than a preset reference voltage, the comparator outputs a control signal to the control chip 10 for the control chip 10 to adjust a pulse width modulation signal output to the driving circuit 30. Duty cycle.
- the duty ratio of the pulse width modulation signal of the driving circuit 30 is changed by the control chip 10, thereby limiting the voltage between the first end and the second end of the switching transistor Q during the off period, thereby preventing Excessive voltage between the first end and the second end during the off period results in damage to the switch tube Q, thus extending the life of the switch tube Q.
- the protection circuit 120 is configured to detect the current state of the second end when the switch tube Q is turned on, and the electromagnetic heating control circuit further includes a serial connection. And a current limiting resistor R11 between the second end and the ground, the voltage detecting end of the protection circuit 120 is connected to the second end to detect the current of the second end.
- the protection circuit 120 can calculate the current flowing through the current limiting resistor R11, that is, the current at the second end of the switching transistor Q, according to the voltage detected by the voltage detecting terminal. Then, according to the current magnitude, the maximum voltage between the first end and the second end of the switch Q after the switch is turned off, when the current flowing through the current limiting resistor R11 causes the switch tube Q to be turned off after the first end and the second end.
- the control switch Q is turned off to ensure that the maximum voltage between the first end and the second end of the switch Q after the switch is turned off is less than the preset voltage, thereby preventing the switch Q
- the magnitude of the current flowing through the current limiting resistor R11 at this time is the maximum current value allowed to flow when the switching transistor Q is turned on, which is referred to as a preset value in the following embodiment.
- the current limiting resistor R11 may be a built-in resistor of the electromagnetic heating control circuit, and may also
- the level state of the output of the signal output terminal of the control driving circuit 10 can be controlled by the driving circuit 30 itself, or can be controlled by controlling the pulse width modulation signal outputted to the driving circuit 10 by the control chip 10.
- the method can be set according to actual needs, and is not further limited herein.
- the protection circuit 120 is connected to the driving circuit 10, and outputs a control signal to the driving circuit 30 when detecting that the current of the second terminal is greater than a preset value. And the driving circuit 30 controls the signal output end to output a preset level signal, so that the switching tube Q is turned off.
- the protection circuit 120 is connected to the control chip 10, and when detecting that the current of the second end is greater than a preset value, outputting a control signal to the control chip 10 for the control.
- the chip 10 adjusts the duty ratio of the pulse width modulation signal output to the drive circuit 30.
- the protection circuit 120 may simultaneously output the control signal to the driving circuit 30 and the control chip 10, that is, the protection circuit 120.
- the control signal output can be connected to the drive circuit 30 and the control chip 10 at the same time.
- the electromagnetic heating control circuit further includes a temperature sensor 150 for detecting the temperature of the switch tube Q, the temperature sensor 150 is connected to the protection circuit 120, and the protection circuit 120 Outputting a control signal to the driving circuit 30 or the control chip 10 according to the temperature detected by the temperature sensor 150, so that the driving circuit 30 or the control chip 10 adjusts the output of the signal output according to the control signal.
- the duty cycle of the pulse width modulated signal is not limited to any of the above embodiments.
- the temperature of the switch tube Q is detected by the protection circuit 120 through the temperature sensor 150, and the temperature of the switch tube Q is fed back to the drive circuit 30 or the control chip 10, and the drive circuit 30 or the control chip 10 adjusts according to the temperature.
- the duty cycle of the pulse width modulation signal to achieve operation such as reducing power, increasing power, and turning off the switching transistor Q.
- the electromagnetic heating circuit includes a coil L, a resonant capacitor C, a control chip 10, a driving module 30, a protection module 240, and a switching transistor Q.
- the coil L is connected in parallel with the resonant capacitor C;
- the switch tube Q has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving module 30, the first The end is connected to one end of the resonant capacitor C, and the second end is connected to the ground end;
- the control chip 10 is used to output a pulse width modulation signal to the drive module 30, the pulse width modulation signal is output to the switch tube Q through the signal output end of the drive module 30 to drive the switch tube Q;
- the protection module 240 is configured to control an operating state of the switch tube Q according to a voltage level of the first end when the switch tube Q is turned off; or the protection module 240 is configured to detect when the switch tube Q is turned on. The current magnitude of the second end controls the operating state of the switching transistor Q.
- the driving circuit provided in this embodiment is mainly used to implement driving control of the switching transistor Q.
- the structure of the switch tube can be set according to actual needs.
- the switch tube Q is preferably an insulated gate bipolar transistor (IGBT), and the first end is a set of the insulated gate bipolar transistor.
- An electrode, the second end is an emitter of the insulated gate bipolar transistor, and the control end is a gate of the insulated gate bipolar transistor.
- the switching transistor Q when the switching transistor Q is turned off, the coil L and the resonant capacitor C enter a resonance state, and the electric energy rises, and at this time, the voltage between the first end and the second end of the switching transistor Q will rise.
- the switch tube Q When the switch tube Q is turned on, the energy stored in the coil L and the resonant capacitor C will be released to reduce the voltage between the first end and the second end of the switch tube Q, and prevent the switch tube Q from being turned off after the switch tube Q is turned off. Excessive voltage between the terminal and the second terminal causes damage to the switching transistor Q.
- preventing the voltage of the first end and the second end of the switch tube Q from being too high may specifically detect the voltage level of the first end when the switch tube Q is turned off or detect the second end of the switch tube Q when the switch tube Q is turned on. Current size.
- the control switch tube Q When detecting the voltage of the first end when the switch tube Q is turned off, if the voltage of the first end is greater than the preset voltage when the switch tube Q is turned off, the control switch tube Q is turned on to prevent the switch tube Q from being turned on. The voltage at one end and the second end is too high to damage the switch tube Q.
- the maximum voltage of the switch tube Q after being turned off can be budgeted according to the current level of the second end of the switch tube Q.
- the control switch tube Q is turned off to prevent the switch tube Q from being turned off. After the voltage rises too high, the switch Q is damaged.
- the embodiment of the present invention controls the working state of the switch tube Q according to the voltage level of the first end when the switch tube Q is turned off by setting the protection module 240; and controlling the current according to the current level of the second end when the switch tube Q is turned on.
- the working state of the switch tube Q Therefore, the voltage between the first end and the second end of the switch tube Q in the off state is effectively prevented from being damaged and the switch tube Q is damaged. Therefore, the electromagnetic heating circuit provided by the present invention improves the stability of the circuit operation.
- the protection module when the protection module is configured to control the operating state of the switch tube Q according to the voltage level of the first end when the switch tube Q is turned off, the protection module includes a voltage sampling circuit. And a comparator, the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor being connected to the first end, and the other end being connected to the ground through the second resistor; The non-inverting input of the comparator is coupled to the common terminal of the first resistor and the second resistor, the inverting input terminal is coupled to the preset reference voltage terminal, and the output terminal is coupled to the control terminal.
- the switch tube Q when the switch tube Q is in the off state, when the voltage across the second resistor is less than the preset reference voltage of the preset reference voltage terminal (ie, the voltage between the first end and the second end is less than the preset voltage) When the switch Q is kept in the off state according to the pulse width modulation signal outputted by the signal output terminal; when the voltage across the second resistor is greater than the preset reference voltage of the preset reference voltage terminal (ie, the first end and the second end) When the voltage between them is greater than the preset voltage), the comparator will output a high level, so that the switching transistor Q is turned on, releasing the energy stored in the coil L and the resonant capacitor C.
- the protection module 240 when the protection module is configured to control the operating state of the switch tube Q according to the voltage level of the first end when the switch tube Q is turned off, the protection module 240 includes voltage sampling. a circuit and a comparator, the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor; The non-inverting input terminal of the comparator is connected to the common end of the first resistor and the second resistor, the inverting input terminal is connected to the preset reference voltage end, and the output end is connected to the driving module 30;
- the comparator When the voltage of the first end is greater than a preset reference voltage, the comparator outputs a control signal to the driving module 30, and the driving module 30 outputs a preset level signal according to the output of the control signal, so that The switch tube Q is turned on.
- the switching transistor Q when the switch tube Q is in the off state, when the voltage across the second resistor is less than the preset reference When the preset voltage of the voltage terminal (that is, the voltage between the first terminal and the second terminal is less than the preset voltage), the switching transistor Q will remain in the off state according to the pulse width modulation signal outputted by the signal output terminal; when the second resistor When the voltage at both ends is greater than the preset reference voltage of the preset reference voltage terminal (ie, the voltage between the first terminal and the second terminal is greater than the preset voltage), the comparator will output a high level signal to the driving module 30, thereby being driven by The module 30 control signal output terminal outputs a high level signal, so that the switching transistor Q is turned on to release the energy stored in the coil L and the resonant capacitor C.
- the protection module 240 when the protection module is configured to control the operating state of the switch tube Q according to the voltage level of the first end when the switch tube Q is turned off, the protection module 240 includes voltage sampling. a circuit and a comparator, the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the first end, and the other end is connected to the ground through the second resistor; The non-inverting input terminal of the comparator is connected to the common end of the first resistor and the second resistor, the inverting input terminal is connected to the preset reference voltage terminal, and the output terminal is connected to the control chip 10;
- the comparator When the voltage of the first terminal is greater than a preset reference voltage, the comparator outputs a control signal to the control chip 10 for the control chip 10 to adjust the pulse width modulation signal output to the driving module 30. Duty cycle.
- the duty ratio of the pulse width modulation signal of the driving module 30 is changed by the control chip 10, thereby limiting the voltage between the first end and the second end of the switching transistor Q during the off period, thereby preventing Excessive voltage between the first end and the second end during the off period results in damage to the switch tube Q, thus extending the life of the switch tube Q.
- the protection module is configured to detect a current state of the second end when the switch tube Q is turned on, and when the working state of the switch tube Q is controlled, the electromagnetic heating circuit further includes a serial connection The current limiting resistor R11 between the second end and the ground end, the voltage detecting end of the protection module is connected to the second end to detect the current of the second end.
- the protection module can calculate the current flowing through the current limiting resistor R11 according to the voltage detected by the voltage detecting terminal, that is, the current of the second end of the switching transistor Q. Then, according to the current magnitude, the maximum voltage between the first end and the second end of the switch Q after the switch is turned off, when the current flowing through the current limiting resistor R11 causes the switch tube Q to be turned off after the first end and the second end.
- the control switch Q is turned off to ensure that the maximum voltage between the first end and the second end of the switch Q after the switch is turned off is less than the preset voltage, thereby preventing the switch Q
- the magnitude of the current flowing through the current limiting resistor R11 at this time is the maximum current value allowed to flow when the switching transistor Q is turned on, which is referred to as a preset value in the following embodiment.
- the current limiting resistor R11 may be a built-in resistor of the protection module or a peripheral resistor.
- the level state of the output of the signal output terminal of the control driving module 30 can be controlled by the driving module 30 itself, or can be controlled by controlling the pulse width modulation signal outputted by the control chip 10 to the driving module 30, and the specific implementation thereof is realized.
- the method can be set according to actual needs, and is not further limited herein.
- the foregoing protection module is connected to the driving module 30, and When detecting that the current of the second end is greater than a preset value, outputting a control signal to the driving module 30, so that the driving module 30 controls the signal output end to output a preset level signal, so that the switch tube Q Shut down.
- the protection module is connected to the control chip 10, and when detecting that the current of the second end is greater than a preset value, outputting a control signal to the control chip 10 for the control chip. 10 adjusting the duty ratio of the pulse width modulation signal output to the drive module 30.
- any one of the above two implementation manners may be adopted when performing circuit design, or the protection module may simultaneously output the above control signal to the driving module 30 and the control chip 10, that is, the control signal of the protection module.
- the output terminal can be connected to the drive module 30 and the control chip 10 at the same time.
- the electromagnetic heating circuit further includes a temperature sensor 150 for detecting a temperature of the switch tube Q, the temperature sensor 150 is connected to the protection module, and the protection module is configured according to the The temperature detected by the temperature sensor 150 outputs a control signal to the driving module 30 or the control chip 10, so that the driving module 30 or the control chip 10 adjusts the signal output terminal to output pulse width modulation according to the control signal.
- the duty cycle of the signal or the switch is turned off.
- the temperature of the switch tube Q is detected by the protection module through the temperature sensor 150, and the temperature of the switch tube Q is fed back to the drive module 30 or the control chip 10, and the drive module 30 or the control chip 10 adjusts the pulse according to the temperature.
- the duty cycle of the wide modulated signal is used to reduce power, increase power, and shut down the switch Q.
- the present invention provides an electromagnetic heating circuit.
- the electromagnetic heating circuit includes a control chip 10, a driving module 30, and a switching transistor Q.
- the switch tube Q has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving module 30;
- the control chip 10 is used to output a pulse width modulation signal to the drive module 30, the pulse width modulation signal is output to the switch tube Q through the signal output end of the drive module 30 to drive the switch tube Q;
- the driving module 30 is configured to detect an output voltage level of the signal output end, and adjust a state in which the signal output end outputs the pulse width modulation signal according to whether the output voltage level of the signal output end belongs to a preset interval range.
- the electromagnetic heating circuit provided in this embodiment is mainly used to implement drive control of the switch tube Q.
- the structure of the switch tube can be set according to actual needs.
- the switch tube Q is preferably an insulated gate bipolar transistor (IGBT), and the first end is a set of the insulated gate bipolar transistor.
- An electrode, the second end is an emitter of the insulated gate bipolar transistor, and the control end is a gate of the insulated gate bipolar transistor.
- the size of the preset interval range may be set according to actual needs, and is not further limited herein as long as the switch tube Q can be driven and the switch tube Q is prevented from being burned out.
- the driving module 30 adjusts, according to whether the output voltage level of the signal output end belongs to a preset interval range, the state in which the signal output end outputs the pulse width modulation signal, including:
- the driving module controls the pulse width modulation signal that the signal output end stops outputting
- the driving module outputs a control signal to the control chip, so that the control chip stops outputting the pulse width modulation signal.
- the driving module 30 can detect the voltage of the signal input end by using a built-in voltage sampling circuit, and can also determine the voltage of the first end by using a comparator.
- the specific circuit form can be set according to actual needs, and is not used here. Further defined. It can be understood that when the output voltage of the signal output terminal does not belong to the preset interval range, the voltage of the signal output end of the driving module 30 can be adjusted by the control chip 10 or the driving module 30, so that the size of the signal output end is stabilized. Belongs to the preset range.
- the output voltage of the signal output terminal is a gate driving voltage of the insulated gate bipolar transistor.
- the drive module 30 may stop outputting the pulse width modulation signal to the gate of the insulated gate bipolar transistor (ie, to be insulated)
- the gate voltage of the gate bipolar transistor is pulled low). Therefore, the gate driving voltage of the insulated gate bipolar transistor is prevented from being excessively high, resulting in damage to the insulated gate bipolar transistor.
- control module 10 and the switch tube Q are connected by the driving module 30, and the state of the pulse width modulation signal is outputted by the driving module 30 according to the voltage control signal output end of the signal output end, thereby effectively preventing the switch tube Q from being If the driving voltage is too high, the switching tube Q is burned out, and the driving voltage of the switching tube is too low, so that the switching tube cannot be opened or in an amplified state. Therefore, the embodiment of the invention improves the stability of the working of the switching tube Q.
- the driving module 30 is further configured to compare the received pulse width modulation signal with a preset reference square wave signal, and adjust the signal according to the comparison result. The state of the pulse width modulated signal output at the output.
- the reference square wave signal may be generated by the control chip 30 or by a square wave generating circuit, and the pulse width of the reference square wave signal is the maximum pulse width allowed to be output.
- the driving module 30 controls the pulse width modulation signal outputted by the signal output end to correspond to the pulse in the period.
- Width adjustment is a pulse width of the reference square wave signal, or a pulse width modulation signal that controls the signal output end to stop outputting;
- the driving module 30 outputs a control signal to the control chip 10 for the control chip. 10 adjusts the state of the pulse width modulation signal output to the drive module 30.
- the overcurrent, overvoltage, overheating, etc. of the insulated gate bipolar transistor are prevented due to the excessive conduction time of the insulated gate bipolar transistor. Improves the safety of insulated gate bipolar transistors.
- the driving module 30 is further configured to detect a voltage between a collector and an emitter of the insulated gate bipolar transistor, and when the insulated gate bipolar transistor When turned on, determining an operating state of the insulated gate bipolar transistor according to a voltage between a collector and an emitter of the insulated gate bipolar transistor according to the turn-on instant, and adjusting an output voltage of the signal output terminal according to the operating state The time to rise to the second preset value.
- the voltage detecting end of the driving module 30 is connected to the collector of the insulated gate bipolar transistor, and the ground end is connected to the emitter of the insulated gate bipolar transistor; thereby detecting the insulated gate bipolar type. The voltage between the collector and emitter of the transistor.
- the above working states include startup, hard opening, and normal;
- the adjusting the time when the output voltage of the signal output terminal rises to the second preset value according to the working state includes:
- the time when the voltage of the signal output terminal rises to the second preset value is a first threshold
- the time when the voltage of the signal output rises to the second preset value is a second threshold
- the time when the voltage of the signal output terminal rises to the second preset value is a third threshold
- the first cycle of the hard switch and the IGBT turn-on caused by the IGBT lead-on causes the resonant capacitor to rise sharply from the 0 voltage to the DC bus voltage (at 220V).
- the electromagnetic heating control circuit includes a switching tube Q, a temperature detecting module 310 for collecting the temperature of the switching tube Q, and an output pulse width modulation signal.
- the switch tube Q has a first end, a second end, and a control end for controlling a state in which the first end and the second end are in communication; the control end is connected to a signal output end of the driving circuit 30;
- the output end of the temperature detecting module 310 is connected to the control chip 10;
- the control chip 10 is configured to acquire the temperature value currently detected by the temperature detecting module 310 every first preset time period, and calculate the currently detected temperature value according to the temperature value detected twice and the temperature compensation factor. The actual temperature value after the error correction; and controlling the working state of the switch tube Q according to the actual temperature value.
- the driving circuit provided in this embodiment is mainly used to implement driving control of the switching transistor Q.
- the structure of the switch tube Q can be set according to actual needs.
- the switch tube Q is preferably an insulated gate bipolar transistor (IGBT), and the first end is the insulated gate bipolar transistor. a collector, the second end being the insulated gate bipolar transistor An emitter, the control terminal being a gate of the insulated gate bipolar transistor.
- IGBT insulated gate bipolar transistor
- the above electric heater is an electromagnetic heating device, for example, it can be an induction cooker, a rice cooker or the like.
- the control chip 10 reads the temperature value detected by the temperature detecting module 310 once at a fixed time interval, and marks the read temperature value as the current temperature value X n and the previous time reading. Temperature values X n-1 , X n-2 , X n-3, and the like. Then, the actual temperature value Y n of the current switching tube is calculated according to X n , X n-1 and the temperature compensation factor.
- the preset temperature compensation factor setting may be set according to actual needs. In this embodiment, it may preferably be obtained in the following manner.
- the control chip 10 acquires the temperature value currently detected by the temperature detecting module 310 every second preset time period, and according to the nth time collected temperature X n and the n-1th detected temperature value X n-1 Calculating a temperature compensation factor A corresponding to a difference between the nth collected temperature X n and the n-1th detected temperature value X n-1 ; the temperature compensation factor A is satisfied
- K is a constant
- M is the temperature-compensated initial temperature.
- the initial temperature is used to control the initial temperature at which the temperature compensation calculation is performed, that is, when the detected temperature is greater than the initial temperature, the temperature compensation calculation is performed.
- the size of the constant K and the initial temperature M may be set according to actual needs.
- the above K is 0.2
- the above M is 50.
- the above compensation factor is firstly tested by the above method before the electromagnetic heating control circuit performs temperature protection to obtain the above temperature compensation factor A, and the corresponding temperature compensation factors are different under different temperature change states.
- the control chip 10 acquires the temperature value detected by the temperature detecting module 310 every first preset time period, and acquires the current detection according to the currently detected temperature value X m and the last detected temperature value X m-1 .
- the compensation factor A corresponding to the difference between the temperature value X m and the last detected temperature value X m-1 is based on the currently detected temperature value X m , the last detected temperature value X m-1 and the compensation
- the control chip 10 may output a control signal to the driving circuit 30, thereby controlling the switching transistor Q to be turned off to prevent the switching transistor Q from being damaged due to excessive temperature. Since the temperature compensation operation is performed, thereby preventing the switch tube Q from being damaged due to the low accuracy of the temperature measurement, the embodiment can improve the accuracy of the temperature measurement of the switch tube and improve the stability of the circuit operation.
- the electromagnetic heating control circuit provided by the embodiment of the present invention detects the temperature value of the switch tube Q by setting the temperature detecting module 310, and controls the working state of the switch tube Q according to the detected temperature and the preset temperature compensation factor, thereby preventing the switch tube from being operated. Since Q is burnt out due to excessive temperature, the present invention improves the stability of circuit operation.
- the temperature detecting module 310 includes a temperature sensor RT, a third resistor 3R1, a third resistor 3R2, and a third capacitor 3C1.
- One end of the third resistor 3R1 is connected to the first preset power source VCC. The other end is connected to the ground through the temperature sensor RT; one end of the third two resistor 3R2 is connected to the common end of the third resistor 3R1 and the temperature sensor RT, and the other end is passed through the third capacitor 3C1
- the common terminal of the third two resistor 3R2 and the third capacitor 3C1 is connected to the temperature signal collecting end of the control chip 10.
- the structure of the temperature sensor RT may be set according to actual needs.
- the temperature sensor RT is a thermistor.
- the driving circuit 30 includes a driving integrated chip 31, a third three resistor 3R3, a first six resistor R16, a first five resistor R15, a first seven resistor R17 and a third two capacitor 3C2, wherein the pulse width of the driving integrated chip 31
- the modulation signal input end is connected to the control chip 10 through a third three resistor 3R3, and the driving voltage input end is connected to the second preset power supply VDD, and the pulse width modulation signal output end passes through the first six resistor R16 and the switch tube Q.
- a control terminal is connected; one end of the first five resistor R15 is connected to the second preset power source VDD, and the other end is connected to the common end of the third three resistor 3R3 and the control chip 10; One end of the resistor R17 is connected to the control end of the switch tube Q, and the other end is connected to the second end of the switch tube Q; one end of the third two capacitor 3C2 is connected to the drive voltage input end, and the other end is connected with Ground connection.
- the voltages of the first preset power supply VCC and the second preset power supply VDD may be set according to actual needs.
- the first preset power supply VCC is a power supply of +5V.
- the second preset power supply VDD is a power supply of +15V.
- the pulse signal input from the pulse width modulation signal input end of the driving integrated chip 31 is driven and amplified by the second preset power supply VDD, and then outputted from the pulse width modulation signal output end, and is output by the first six resistors R16 and The seven resistor R17 performs voltage division, and the switching transistor Q switches between the on and off states according to the voltage across the first seven resistors R17.
- the driving circuit 30 further includes a Zener diode D, and the anode of the Zener diode D Connected to the second end of the switch tube Q, and the cathode is connected to the control end of the switch tube Q.
- the electric heating drive protection circuit further includes a buzzer circuit 340, and the buzzer circuit 340 is connected to the control chip 10.
- the control chip 10 when the temperature value currently detected by the temperature detecting module 310 is greater than a preset value (that is, when the temperature of the switch tube Q is too high), the control chip 10 outputs a control control signal to the driving circuit 30 to turn off the switch tube. At the same time, Q can output a control signal to the buzzer circuit 340 to control the buzzer circuit 340 to sound, thereby reminding the user that the electric heater has a safety hazard, so this embodiment can improve the safety of the electric heater.
- a preset value that is, when the temperature of the switch tube Q is too high
- the surge protection circuit includes a first voltage dividing circuit 410 composed of a resistor and a capacitor, and a rectifier circuit 70 for rectifying the commercial power.
- An input end of the first voltage dividing circuit 410 is connected to an output end of the rectifier circuit 70, and an output end of the first voltage dividing circuit 410 is connected to a first input end of the first comparator 301;
- the second input end of the first comparator 301 is connected to the preset first standard power source, and when the mains voltage is lower than the first preset value, when there is a forward surge, the first voltage dividing circuit 410
- the voltage of the output terminal is greater than the voltage of the first standard power source.
- the control circuit 430 is according to the first comparator 301.
- the state of the output level of the output is subjected to surge protection control.
- the first input end of the first comparator 301 may be a non-inverting input terminal or an inverting input terminal, and may be specifically set according to actual needs, which is not further limited herein.
- the voltage level of the preset first standard power source can be set according to actual needs. In this embodiment, preferably, the voltage of the first standard power source is +5V.
- the output of the first voltage dividing circuit 410 is The voltage is less than the voltage of the first standard power supply, and the first comparator 301 outputs a first level signal; if there is a surge spike voltage, the output of the first comparator 301 is when the surge spike voltage arrives.
- a flipping voltage will be output to obtain a second level signal, and the control circuit 430 will perform a surge protection operation based on the second level signal.
- the first voltage dividing circuit 410 performs voltage division, and the voltage after the voltage division is compared with the first standard voltage, and the mains voltage is determined according to the comparison result. Whether there is a forward surge voltage near the zero time period, when there is a forward surge voltage, the surge protection is performed by the control circuit 10. Since the invention realizes the surge detection in the time when the utility power is close to the zero point, thereby preventing the power consumption device from being damaged due to the surge phenomenon at the zero crossing point of the commercial power, the safety of the power supply is improved.
- the first voltage dividing circuit 410 includes a first resistor R1, a second resistor R2, and a first capacitor C1.
- One end of the first resistor R1 is connected to an output end of the rectifier circuit 70, and the other end passes the
- the second resistor R2 is connected to the ground;
- the first capacitor C1 is connected in parallel to the two ends of the second resistor R2;
- the first input end of the first comparator 301 is connected to the first resistor R1 and the second The common end of resistor R2.
- first resistor R1 and the second resistor R2 may be formed by one resistor or a plurality of resistors, and the corresponding voltage division ratio may be achieved as long as the corresponding resistance value is met.
- the surge protection circuit further includes a second voltage dividing circuit 40 and a third voltage dividing circuit 50 composed of a resistor and a capacitor
- the control circuit 430 further includes a second comparison. 32 and third ratio Comparator 33;
- An input end of the second voltage dividing circuit 40 is connected to an output end of the rectifier circuit 70, and an output end of the second voltage dividing circuit 40 is connected to a first input end of the second comparator 32, The second input end of the second comparator 32 is connected to the output end of the first voltage dividing circuit 410; and when the mains power does not have a forward surge voltage, the output end of the first voltage dividing circuit 410 The voltage is greater than the voltage of the output end of the second voltage dividing circuit 40; when the commercial power has a forward surge voltage, the voltage of the output end of the first voltage dividing circuit 410 is smaller than that of the second voltage dividing circuit 40 The voltage at the output;
- An input end of the third voltage dividing circuit 50 is connected to an output end of the rectifier circuit 70, and an output end of the third voltage dividing circuit 50 is connected to a first input end of the third comparator 33,
- the second input end of the third comparator 33 is connected to the preset second standard power source for detecting the zero-crossing point of the mains, and when the output voltage of the third voltage dividing circuit 33 is less than the second preset At the time of the value, the output of the second comparator 32 is controlled to output a preset level signal.
- the surge detection in the commercial power is realized by comparing the voltage of the second voltage dividing circuit 40 with the voltage of the first voltage dividing circuit 410. Further, a voltage dividing circuit can also be provided to implement negative surge detection.
- the surge protection circuit further includes a fourth voltage dividing circuit 60 composed of a resistor and a capacitor
- the control circuit 430 further includes a fourth comparator 34;
- An input end of the fourth voltage dividing circuit 34 is connected to an output end of the rectifier circuit 70, and an output end of the fourth voltage dividing circuit 60 is connected to a first input end of the fourth comparator 34, a second input of the fourth comparator 34 is coupled to an output of the second voltage divider circuit 60; and when the mains supply does not have a negative surge voltage, the output of the fourth voltage divider circuit 60 The voltage is lower than the voltage of the output end of the second voltage dividing circuit 40; when the main power has a negative surge voltage, the voltage of the output end of the fourth voltage dividing circuit 60 is greater than that of the second voltage dividing circuit 40 The voltage at the output;
- the third comparator 33 is further configured to control the output end of the fourth comparator 34 to output a preset level signal when the output voltage of the third voltage dividing circuit 50 is less than a second preset value.
- the third voltage dividing circuit 50 is configured to implement zero-crossing detection. Specifically, when the voltage at the output end of the third voltage dividing circuit 50 is greater than the second preset value, the output of the third comparator 32 is output. A level signal, when the voltage at the output of the third voltage dividing circuit 50 is less than the second predetermined value, the output of the third comparator 32 outputs a flip level signal. At this time, the control circuit 430 will shield the second comparator 32 and the fourth comparator 34 from outputting the preset level signal according to the flip level signal, thereby preventing the first voltage dividing circuit 410, the second voltage dividing circuit 40, and the fourth.
- the output voltages of the first voltage dividing circuit 410, the second voltage dividing circuit 40, and the fourth voltage dividing circuit 60 are close to each other, causing the second comparator 32 and the fourth comparator 34 to output incorrectly. Therefore, the stability of the power supply is improved.
- the second voltage dividing circuit 40 includes a third resistor R3, a fourth resistor R4, and a second capacitor C1.
- One end of the three resistor R3 is connected to the output end of the rectifier circuit 20, the other end is connected to the ground through the fourth resistor R4; the second capacitor C2 is connected in parallel to both ends of the fourth resistor R4;
- a first input of the second comparator 32 is coupled to a common terminal of the third resistor R3 and the fourth resistor R4.
- the third voltage dividing circuit 50 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, and a fourth capacitor C4, and one end of the fifth resistor R5 and the output end of the rectifier circuit 70 Connecting, the other end is connected in series with the grounding terminal through the sixth resistor R6 and the seventh resistor R7; the third capacitor C3 is connected in parallel to the two ends of the fifth resistor R5; the fourth capacitor C4 is connected in parallel The first input end of the third comparator 33 is connected to a common end of the sixth resistor R6 and the seventh resistor R7.
- the fourth voltage dividing circuit 60 includes an eighth resistor R8, a ninth resistor R9, and a fifth capacitor C5.
- One end of the eighth resistor R8 is connected to the output end of the rectifier circuit 70, and the other end is passed through the ninth resistor.
- R9 is connected to the ground;
- the fifth capacitor C5 is connected in parallel to the two ends of the ninth resistor R9;
- the first input end of the fourth comparator 34 is connected to the eighth resistor R8 and the ninth resistor R9 Public side.
- the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 may be one resistor, or may be sequentially connected in series by a plurality of resistors.
- the size of the first capacitor C1, the second capacitor C2, and the fifth capacitor C5 may be set according to actual needs. In this embodiment, preferably, the capacitance of the first capacitor C1 is equal to the capacitance of the fifth capacitor C5. And the capacitance of the first capacitor C1 is greater than the capacitance of the second capacitor C2.
- the first voltage dividing circuit 410, the second voltage dividing circuit 40, and the fourth voltage dividing circuit 60 directly set a voltage dividing resistor R which is jointly divided, and after a partial voltage division, respectively, the first voltage dividing circuit 410, the second voltage dividing circuit 40 and The fourth voltage dividing circuit 60 performs secondary voltage division.
- the circuit structure of the rectifying circuit 70 may be configured to include a first diode D1 and a second diode D2 according to actual needs, and an anode of the first diode D1 and the mains of the mains An AC input terminal is connected, the second diode D2 is connected to the second AC input terminal of the mains, and a cathode of the first diode D1 is connected to a cathode of the second diode D2.
- the first AC input end may be an L line end, and the second AC input end is an N line end; the first AC input end may also be an N line end, and the second AC input end may be an L line end.
- the first diode D1 and the second diode D2 to perform full-wave rectification of the commercial power, positive surge detection and negative surge detection can be realized.
- the present invention also provides a home appliance, which includes an electromagnetic heating control circuit.
- the structure of the electromagnetic heating control circuit can be referred to the above embodiment, and details are not described herein again.
- the household appliance of the embodiment is adopted The technical solution of the electromagnetic heating control circuit is described, and therefore the household appliance has all the beneficial effects of the above electromagnetic heating control circuit.
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Abstract
Description
Claims (92)
- 一种电磁加热控制电路,其特征在于,包括控制芯片(10)、整流滤波电路(20)、谐振电容(C)、开关管(Q)、驱动电路(30)和同步电压检测电路,其中,所述开关管(Q)包括第一端、第二端和用于控制所述第一端与所述第二端连通状态的控制端,所述第一端通过谐振电容(C)与所述整流滤波电路(20)的正输出端连接,所述第二端通过限流电阻(R11)与所述整流滤波电路(20)的负输出端连接;所述控制芯片(10)包括同相电压输入端、反相电压输入端、电压检测端和信号输出端;所述同相电压输入端和反相电压输入端通过所述同步电压检测电路检测所述谐振电容(C)两端的电压,所述信号输出端通过所述驱动电路(30)与所述控制端连接;所述电压检测端经所述同步电压检测电路连接至整流滤波电路(20)的正输出端,所述控制芯片(10)根据所述电压检测端检测的电压控制所述开关管(Q)工作的状态,并根据所述同相电压输入端和反相电压输入端的电压大小控制所述开关管(Q)在所述谐振电容(C)与所述开关管(Q)的连接端电压为零伏时导通。
- 如权利要求1所述的电磁加热控制电路,其特征在于,所述同步电压检测电路包括:第一电压采样电路,所述第一电压采样电路的一端与所述整流滤波电路(20)的正输出端连接,另一端分别与所述同相电压输入端和电压检测端连接;第二电压采样电路,所述第二电压采样电路的一端与所述开关管(Q)的第一端连接,另一端与所述反相电压输入端连接。
- 如权利要求2所述的电磁加热控制电路,其特征在于,所述第一电压采样电路包括第一零电阻(R10)和第一二电阻(R12),所述第一零电阻(R10)的一端与所述整流滤波电路(20)的正输出端连接,另一端通过所述第一二电阻(R12)与所述整流滤波电路(20)的负输出端连接;所述第一零电阻(R10)与所述第一二电阻(R12)之间的公共端连接至所述同相电压输入端;所述第二电压采样电路包括第一三电阻(R13)和第一四电阻(R14),所述第一三电阻(R13)的一端与所述开关管(Q)的所述第一端连接,所述第一三电阻(R13)的另一端通过所述第一四电阻(R14)与所述整流滤波电路(20)的负输出端连接,所述第一三电阻(R13)与所述第一四电阻(R14)之间的公共端连接至所述反相电压输入端。
- 如权利要求1所述的电磁加热控制电路,其特征在于,所述驱动电路(30)包括驱动芯片(31)、第一五电阻(R15)、第一六电阻(R16)、第一七电阻(R17),其中所述驱动芯片(31)的驱动输入端通过第一五电阻(R15)与所述信号输出端连接,且所述驱动输入端与预置电源连接,所述驱动芯片(31)的驱动输出端通过第一六电阻(R16)和第一七电阻(R17)串接后连接至所述开关管(Q)的第二端连接;所述第一六电阻(R16)和第一七电阻(R17)的公共端与所述开关管(Q)的控制端连接。
- 如权利要求4所述的电磁加热控制电路,其特征在于,所述驱动电路(30)还包括稳压二极管(D),所述稳压二极管(D)的阴极与所述控制端连接,阳极与所述开关管(Q)的第二端连接。
- 如权利要求1所述的电磁加热控制电路,其特征在于,所述整流滤波电路(20)包括整流桥堆(21)、电感(L0)和电容(C12),其中所述整流桥堆(21)的正输出端通过所述电感(L0)与所述谐振电容(C)连接,整流桥堆(21)的负输出端通过所述限流电阻(R11)与所述开关管(Q)的第二端连接;所述电容(C12)的一端连接至所述电感(L0)和谐振电容(C)的公共端,另一端与所述整流桥堆(21)的负输出端连接。
- 如权利要求1所述的电磁加热控制电路,其特征在于,所述开关管(Q)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 如权利要求1所述的电磁加热控制电路,其特征在于,其中,所述驱动电路(30)与控制芯片(10)连接,并将接收到所述控制芯片(10)输出的脉宽调制信号放大后经所述驱动电路(30)的信号输出端输出至所述开关管(Q),以驱动所述开关管(Q),所述驱动电路(30)用于检测所述信号输出端的输出电压大小,并根据所述信号输出端的输出电压大小是否属于预置区间范围调整所述信号输出端输出所述脉宽调制信号的状态;所述电磁加热控制电路,还包括保护电路(120),所述保护电路(120)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态;或者所述保护电路(120)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态。
- 如权利要求8所述的电磁加热控制电路,其特征在于,所述保护电路(120)根据所述信号输出端的输出电压大小调整所述信号输出端输出所述脉宽调制信号的状态包括:当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动电路(30)控制所述信号输出端停止输出的脉宽调制信号;或者当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动电路(30)输出控制信号至所述控制芯片(10),以供所述控制芯片(10)停止输出所述脉宽调制信号。
- 如权利要求8所述的电磁加热控制电路,其特征在于,所述驱动电路(30)还用于将接收到的所述脉宽调制信号与预置的基准方波信号进行比较,并根据比较的结果调整所述信号输出端输出的脉宽调制信号的状态。
- 如权利要求8所述的电磁加热控制电路,其特征在于,所述开关管(Q)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 如权利要求11所述的电磁加热控制电路,其特征在于,所述驱动电路(30)还用于检测所述绝缘栅双极型晶体管的集电极与发射极之间的电压,并当所述绝缘栅双极型晶体管开通时,根据开通瞬间所述绝缘栅双极型晶体管的集电极与发射极之间的电压确定所述绝缘栅双极型晶体管的工作状态,根据所述工作状态调整所述信号输出端的输出电压上升到第二预设值的时间。
- 如权利要求12所述的电磁加热控制电路,其特征在于,所述工作状态包括启动、硬开和正常;所述根据工作状态调整所述信号输出端的输出电压上升到第二预设值的时间包括:当所述工作状态为启动时,所述信号输出端的电压上升到第二预设值的时间为第一阈值;当所述工作状态为硬开时,所述信号输出端的电压上升到第二预设值的时间为第二阈值;当所述工作状态为正常时,所述信号输出端的电压上升到第二预设值的时间为第三阈值。
- 如权利要求8所述的电磁加热控制电路,其特征在于,当所述保护电路(120)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时, 所述保护电路(120)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端连接至所述控制端。
- 如权利要求8所述的电磁加热控制电路,其特征在于,所述保护电路(120)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态时,所述智能功率电路集成电路还包括串接于所述第二端与所述接地端之间的限流电阻(R11),所述保护电路(120)的电压检测端与所述第二端连接以检测所述第二端的电流大小。
- 如权利要求15所述的电磁加热控制电路,其特征在于,所述保护电路(120)与所述驱动电路(30)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述驱动电路(30),以供所述驱动电路(30)控制所述信号输出端输出预置电平信号,使所述开关管(Q)关断。
- 如权利要求16所述的电磁加热控制电路,其特征在于,所述保护电路(120)与所述控制芯片(10)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调整输出至所述驱动电路(30)的脉宽调制信号的占空比。
- 如权利要求1所述的电磁加热控制电路,其特征在于,其中,所述控制芯片(10)用于输出脉宽调制信号所述驱动模块(30),所述脉宽调制信号经过所述驱动模块(30)的信号输出端输出至所述开关管(Q),以驱动所述开关管(Q);所述电磁加热控制电路还包括保护模块(240),所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态;或者所述保护模块(240)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态。
- 如权利要求18所述的电磁加热控制电路,其特征在于,当所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时,所述保护模块(240)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二 电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端连接至所述控制端。
- 如权利要求18所述的电磁加热控制电路,其特征在于,当所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时,所述保护模块(240)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端与所述驱动模块(30)连接;当所述第一端的电压大于预置参考电压时,所述比较器输出控制信号至所述驱动模块(30),所述驱动模块(30)根据所述控制信号输出端输出预置电平信号,使所述开关管(Q)开通。
- 如权利要求18所述的电磁加热控制电路,其特征在于,当所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时,所述保护模块(240)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端与所述控制芯片(10)连接;当所述第一端的电压大于预置参考电压时,所述比较器输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调整输出至所述驱动模块(30)的脉宽调制信号的占空比。
- 如权利要求18所述的电磁加热控制电路,其特征在于,所述保护模块(240)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态时,所述电磁加热电路还包括串接于所述第二端与所述接地端之间的限流电阻(R11),所述保护模块(240)的电压检测端与所述第二端连接以检测所述第二端的电流大小。
- 如权利要求22所述的电磁加热控制电路,其特征在于,所述保护模块(240)与所述驱动模块(30)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述驱动模块(30),以供所述驱动模块(30)控制所述信号输出端输出预置电平信号,使所述 开关管(Q)关断。
- 如权利要求23所述的电磁加热控制电路,其特征在于,所述保护模块(240)与所述控制芯片(10)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调整输出至所述驱动模块(30)的脉宽调制信号的占空比。
- 如权利要求18所述的电磁加热电路,其特征在于,所述电磁加热电路还包括用于检测所述开关管(Q)温度的温度传感器(150),所述温度传感器(150)与所述保护模块(240)连接,所述保护模块(240)根据所述温度传感器(150)检测的温度输出控制信号至所述驱动模块(30)或所述控制芯片(10),以供所述驱动模块(30)或所述控制芯片(10)根据所述控制信号调整所述信号输出端输出脉宽调制信号的占空比或使所述开关管(Q)关断。
- 如权利要求1所述的电磁加热电路,其特征在于,其中,所述控制芯片(10)用于输出脉宽调制信号所述驱动模块(30),所述脉宽调制信号经过所述驱动模块(30)的信号输出端输出至所述开关管(Q),以驱动所述开关管(Q);驱动模块(30)用于检测所述信号输出端的输出电压大小,并根据所述信号输出端的输出电压大小是否属于预置区间范围调整所述信号输出端输出所述脉宽调制信号的状态。
- 如权利要求26所述的电磁加热电路,其特征在于,所述驱动模块(30)还用于将接收到的所述脉宽调制信号与预置的基准方波信号进行比较,并根据比较的结果调整所述信号输出端输出的脉宽调制信号的状态。
- 如权利要求27所述的电磁加热电路,其特征在于,所述驱动模块(30)根据比较的结果调整所述信号输出端输出的脉宽调制信号的状态包括:当所述驱动模块(30)接收到的脉宽调制信号的脉宽大于所述基准方波信号的脉宽时,所述驱动模块(30)控制所述信号输出端输出的脉宽调制信号对应周期内的脉宽调整为所述基准方波信号的脉宽,和或者或控制所述信号输出端停止输出的脉宽调制信号;或者当所述驱动模块(30)接收到的脉宽调制信号的脉宽大于所述基准方波信号的脉宽时,所述驱动模块(30)输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调 整输出至所述驱动模块(30)的脉宽调制信号的状态。
- 如权利要求26所述的电磁加热电路,其特征在于,所述驱动模块(30)根据所述信号输出端的输出电压大小是否属于预置区间范围调整所述信号输出端输出所述脉宽调制信号的状态包括:当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动模块(30)控制所述信号输出端停止输出的脉宽调制信号;或者当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动模块(30)输出控制信号至所述控制芯片(10),以供所述控制芯片(10)停止输出所述脉宽调制信号。
- 如权利要求26所述的电磁加热电路,其特征在于,所述控制芯片(10)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 如权利要求30所述的电磁加热电路,其特征在于,所述驱动模块(30)还用于检测所述绝缘栅双极型晶体管的集电极与发射极之间的电压,并当所述绝缘栅双极型晶体管开通时,根据开通瞬间所述绝缘栅双极型晶体管的集电极与发射极之间的电压确定所述绝缘栅双极型晶体管的工作状态,根据所述工作状态调整所述信号输出端的输出电压上升到第二预设值的时间。
- 如权利要求31所述的电磁加热电路,其特征在于,所述工作状态包括启动、硬开和正常;所述根据工作状态调整所述信号输出端的输出电压上升到第二预设值的时间包括:当所述工作状态为启动时,所述信号输出端的电压上升到第二预设值的时间为第一阈值;当所述工作状态为硬开时,所述信号输出端的电压上升到第二预设值的时间为第二阈值;当所述工作状态为正常时,所述信号输出端的电压上升到第二预设值的时间为第三阈值;
- 如权利要求1所述的电磁加热电路,其特征在于,还包括:用于采集开关管(Q)温度的温度检测模块(310),所述温度检测模块(310)的输出端与所述控制芯片(10)连接;所述控制芯片(10)用于每隔第一预置时间段获取所述温度检测模块(310)当前检测 的温度值,并根据连续两次检测的温度值和所述温度补偿因子算当前检测的温度值进行误差校正后的实际温度值;并根据所述实际温度值控制所述开关管(Q)的工作状态。
- 如权利要求34所述的电磁加热控制电路,其特征在于,所述控制芯片(10)用于每隔第一预置时间段获取所述温度检测模块(310)当前检测的温度值,并根据连续两次检测的温度值和所述温度补偿因子算当前检测的温度值进行误差校正后的实际温度值具体为:所述控制芯片(10)每隔第一预置时间段获取温度检测模块(310)检测的温度值,并根据当前检测的温度值Xm和上一次检测的温度值Xm-1获取当前检测的温度值Xm和上一次检测的温度值Xm-1之间的差值对应的补偿因子A,根据所述当前检测的温度值Xm、上一次检测的温度值Xm-1和补偿因子A计算所述实际温度值Ym,Ym满足:Ym=Xm-1+A(Xm-Xm-1)。
- 如权利要求33所述的电磁加热控制电路,其特征在于,所述温度检测模块(310)包括温度传感器(RT)、第三一电阻(3R1)、第三二电阻(3R2)和第三一电容(3C1),所述第三一电阻(3R1)的一端与第一预置电源连接,另一端通过所述温度传感器(RT)与接地端连接;所述第三二电阻(3R2)的一端连接至所述第三一电阻(3R1)与所述温度传感器(RT)的公共端,另一端通过第三一电容(3C1)与接地端连接,所述第三二电阻(3R2)和第三一电容(3C1)的公共端连接至所述控制芯片(10)的温度信号采集端。
- 如权利要求33所述的电磁加热控制电路,其特征在于,所述驱动电路(30)包括驱动集成芯片31、第三三电阻(3R3)、第一六电阻(R16)、第一五电阻(R15)、第一七电阻(R17)和第三二电容(3C2),其中所述驱动集成芯片31的脉宽调制信号输入端通过第三三电阻(3R3)与所述控制芯片(10)连接,驱动电压输入端与第二预置电源连接,脉宽调制信号输出端通过第一六电阻(R16)与所述开关管(Q)的控制端连接;所述第一五电 阻(R15)的一端与所述第二预置电源连接,另一端连接至所述第三三电阻(3R3)与所述控制芯片(10)的公共端;所述第一七电阻(R17)的一端与所述开关管(Q)的控制端连接,另一端与所述开关管(Q)的第二端连接;所述第三二电容(3C2)的一端与所述驱动电压输入端连接,另一端与接地端连接。
- 如权利要求37所述的电磁加热控制电路,其特征在于,所述驱动电路(30)还包括稳压二极管(D),所述稳压二极管(D)的阳极与所述开关管(Q)的第二端连接,阴极与所述开关管(Q)的控制端连接。
- 如权利要求33所述的电磁加热控制电路,其特征在于,所述开关管(Q)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 如权利要求33所述的电磁加热控制电路,其特征在于,还包括蜂鸣器电路(340),所述蜂鸣器电路(340)与所述控制芯片(10)连接。
- 如权利要求1所述的电磁加热控制电路,其特征在于,还包括:浪涌保护电路,所述浪涌保护电路包括由电阻和电容组成的第一分压电路(410)、用于进行浪涌保护的控制电路(430);所述控制电路(430)包括第一比较器(301);所述第一分压电路(410)的输入端与所述整流电路(70)的输出端连接,所述第一分压电路(410)的输出端与所述第一比较器(301)的第一输入端连接;所述第一比较器(301)的第二输入端与预置的第一标准电源连接,并当所述市电在电压小于第一预设值的状态下,当存在正向浪涌时,所述第一分压电路(410)的输出端的电压大于所述第一标准电源的电压,当不存在正向浪涌时,所述第一分压电路(410)的输出端的电压小于所述第一标准电源的电压;所述控制电路(430)根据所述第一比较器(301)输出端输出电平的状态进行浪涌保护控制。
- 如权利要求41所述的电磁加热控制电路,其特征在于,所述第一分压电路(410)包括第一电阻(R1)、第二电阻(R2)和第一电容,所述第一电阻(R1)的一端与所述整流电路(70)的输出端连接,另一端通过所述第二电阻(R2)与接地端连接;所述第一电容并联于所述第二电阻(R2)的两端;所述第一比较器(301)的第一输入端连接至所述第一电 阻(R1)和第二电阻(R2)的公共端。
- 如权利要求41所述的电磁加热控制电路,其特征在于,所述浪涌保护电路还包括由电阻和电容组成的第二分压电路(40)和第三分压电路(50),所述控制电路(430)还包括第二比较器(32)和第三比较器(33);所述第二分压电路(40)的输入端与所述整流电路(70)的输出端连接,所述第二分压电路(40)的输出端与所述第二比较器(32)的第一输入端连接,所述第二比较器(32)的第二输入端与所述第一分压电路(410)的输出端连接;且当所述市电不存在正向浪涌电压时,所述第一分压电路(410)的输出端的电压大于所述第二分压电路(40)的输出端的电压;当所述市电存在正向浪涌电压时,所述第一分压电路(410)的输出端的电压小于所述第二分压电路(40)的输出端的电压;所述第三分压电路(50)的输入端与所述整流电路(70)的输出端连接,所述第三分压电路(50)的输出端与所述第三比较器(33)的第一输入端连接,所述第三比较器(33)的第二输入端与预置的第二标准电源连接,用于检测所述市电的过零点,并当所述第三分压电路(50)的输出端电压小于第二预设值时,控制所述第二比较器(32)的输出端输出预置电平信号。
- 如权利要求43所述的电磁加热控制电路,其特征在于,所述第二分压电路(40)包括第三电阻(R3)、第四电阻(R4)和第二电容,所述第三电阻(R3)的一端与所述整流电路(70)的输出端连接,另一端通过所述第四电阻(R4)与接地端连接;所述第二电容并联于所述第四电阻(R4)的两端;所述第二比较器(32)的第一输入端连接至所述第三电阻(R3)和第四电阻(R4)的公共端。
- 如权利要求43所述的电磁加热控制电路,其特征在于,所述第三分压电路(50)包括第五电阻(R5)、第六电阻(R6)、第七电阻(R7)、第三电容和第四电容,所述第五电阻(R5)的一端与所述整流电路(70)的输出端连接,另一端通过所述第六电阻(R6)和第七电阻(R7)依次串接后与接地端连接;所述第三电容并联于所述第五电阻(R5)的两端;所述第四电容并联于所述第七电阻(R7)的两端;所述第三比较器(33)的第一输入端连接至所述第六电阻(R6)和第七电阻(R7)的公共端。
- 如权利要求43所述的电磁加热控制电路,其特征在于,所述浪涌保护电路还包括 由电阻和电容组成的第四分压电路(60),所述控制电路(430)还包括第四比较器(34);所述第四分压电路(60)的输入端与所述整流电路(70)的输出端连接,所述第四分压电路(60)的输出端与所述第四比较器(34)的第一输入端连接,所述第四比较器(34)的第二输入端与所述第二分压电路(40)的输出端连接;且当所述市电不存在负向浪涌电压时,所述第四分压电路(60)的输出端的电压小于所述第二分压电路(40)的输出端的电压;当所述市电存在负向浪涌电压时,所述第四分压电路(60)的输出端的电压大于所述第二分压电路(40)的输出端的电压;所述第三比较器(33)还用于当所述第三分压电路(50)的输出端电压小于第二预设值时,控制所述第四比较器(34)的输出端输出预置电平信号。
- 如权利要求46所述的电磁加热控制电路,其特征在于,所述第四分压电路(60)包括第八电阻(R8)、第九电阻(R9)和第五电容,所述第八电阻(R8)的一端与所述整流电路(70)的输出端连接,另一端通过所述第九电阻(R9)与接地端连接;所述第五电容并联于所述第九电阻(R9)的两端;所述第四比较器(34)的第一输入端连接至所述第八电阻(R8)和第九电阻(R9)的公共端。
- 如权利要求41所述的电磁加热控制电路,其特征在于,所述整流电路(70)包括第一二极管(D1)和第二二极管(D2),所述第一二极管(D1)的阳极与所述市电的第一交流输入端连接,所述第二二极管(D2)与所述市电的第二交流输入端连接,所述第一二极管(D1)的阴极与所述第二二极管(D2)的阴极连接。
- 一种电磁加热设备,其特征在于,包括如权利要求1至48中任一项所述的电磁加热控制电路。
- 一种电磁加热控制电路,其特征在于,包括驱动电路(30)、保护电路(120)和开关管(Q);其中,所述开关管(Q)具有第一端、第二端和用于控制第一端与第二端连通状态的控制端;所述控制端与所述驱动电路(30)的信号输出端连接,第二端与接地端连接;所述驱动电路(30)与控制芯片(10)连接,并将接收到所述控制芯片(10)输出的脉宽调制信号放大后经所述驱动电路(30)的信号输出端输出至所述开关管(Q),以驱动所述开关管(Q);所述驱动电路(30)用于检测所述信号输出端的输出电压大小,并根据所述信号输出端的输出电压大小是否属于预置区间范围调整所述信号输出端输出所述脉宽调制信号的状态;所述保护电路(120)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态;或者所述保护电路(120)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态。
- 如权利要求50所述的电磁加热控制电路,其特征在于,所述保护电路(120)根据所述信号输出端的输出电压大小调整所述信号输出端输出所述脉宽调制信号的状态包括:当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动电路(30)控制所述信号输出端停止输出的脉宽调制信号;或者当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动电路(30)输出控制信号至所述控制芯片(10),以供所述控制芯片(10)停止输出所述脉宽调制信号。
- 如权利要求50所述的电磁加热控制电路,其特征在于,所述驱动电路(30)还用于将接收到的所述脉宽调制信号与预置的基准方波信号进行比较,并根据比较的结果调整所述信号输出端输出的脉宽调制信号的状态。
- 如权利要求50所述的电磁加热控制电路,其特征在于,所述开关管(Q)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 如权利要求53所述的电磁加热控制电路,其特征在于,所述驱动电路(30)还用于检测所述绝缘栅双极型晶体管的集电极与发射极之间的电压,并当所述绝缘栅双极型晶体管开通时,根据开通瞬间所述绝缘栅双极型晶体管的集电极与发射极之间的电压确定所述绝缘栅双极型晶体管的工作状态,根据所述工作状态调整所述信号输出端的输出电压上升到第二预设值的时间。
- 如权利要求54所述的电磁加热控制电路,其特征在于,所述工作状态包括启动、硬开和正常;所述根据工作状态调整所述信号输出端的输出电压上升到第二预设值的时间包括:当所述工作状态为启动时,所述信号输出端的电压上升到第二预设值的时间为第一阈值;当所述工作状态为硬开时,所述信号输出端的电压上升到第二预设值的时间为第二阈值;当所述工作状态为正常时,所述信号输出端的电压上升到第二预设值的时间为第三阈值;
- 如权利要求50所述的电磁加热控制电路,其特征在于,当所述保护电路(120)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时,所述保护电路(120)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端连接至所述控制端。
- 如权利要求50所述的电磁加热控制电路,其特征在于,所述保护电路(120)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态时,所述电磁加热控制电路还包括串接于所述第二端与所述接地端之间的限流电阻(R11),所述保护电路(120)的电压检测端与所述第二端连接以检测所述第二端的电流大小。
- 如权利要求57所述的电磁加热控制电路,其特征在于,所述保护电路(120)与所述驱动电路(30)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述驱动电路(30),以供所述驱动电路(30)控制所述信号输出端输出预置电平信号,使所述开关管(Q)关断。
- 如权利要求58所述的电磁加热控制电路,其特征在于,所述保护电路(120)与所述控制芯片(10)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调整输出至所述驱动电路(30)的脉宽调制信号的占空比。
- 一种电磁加热电路,其特征在于,包括线圈(L)、谐振电容(C)、控制芯片(10)、驱动模块(30)、保护模块(240)和开关管(Q);其中,所述线圈(L)与所述谐振电容(C)并联;所述开关管(Q)具有第一端、第二端和用于控制第一端与第二端连通状态的控制端;所述控制端与所述驱动模块(30)的信号输出端连接,所述第一端与所述谐振电容(C)的一端连接,第二端与接地端连接;所述控制芯片(10)用于输出脉宽调制信号所述驱动模块(30),所述脉宽调制信号经过所述驱动模块(30)的信号输出端输出至所述开关管(Q),以驱动所述开关管(Q);所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态;或者所述保护模块(240)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态。
- 如权利要求60所述的电磁加热电路,其特征在于,当所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时,所述保护模块(240)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端连接至所述控制端。
- 如权利要求60所述的电磁加热电路,其特征在于,当所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时,所述保护模块(240)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端与所述驱动模块(30)连接;当所述第一端的电压大于预置参考电压时,所述比较器输出控制信号至所述驱动模块(30),所述驱动模块(30)根据所述控制信号输出端输出预置电平信号,使所述开关管(Q)开通。
- 如权利要求60所述的电磁加热电路,其特征在于,当所述保护模块(240)用于根据所述开关管(Q)关断时所述第一端的电压大小控制所述开关管(Q)的工作状态时,所述保护模块(240)包括电压采样电路和比较器,所述电压采样电路包括第一电阻和第二电阻,所述第一电阻的一端与所述第一端连接,另一端通过所述第二电阻与所述接地端连接;所述比较器的同相输入端连接至所述第一电阻和第二电阻的公共端,反相输入端与预置参考电压端连接,输出端与所述控制芯片(10)连接;当所述第一端的电压大于预置参考电压时,所述比较器输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调整输出至所述驱动模块(30)的脉宽调制信号的占空比。
- 如权利要求60所述的电磁加热电路,其特征在于,所述保护模块(240)用于检测所述开关管(Q)开通时所述第二端的电流大小控制所述开关管(Q)的工作状态时,所述电磁加热电路还包括串接于所述第二端与所述接地端之间的限流电阻(R11),所述保护模块(240)的电压检测端与所述第二端连接以检测所述第二端的电流大小。
- 如权利要求64所述的电磁加热电路,其特征在于,所述保护模块(240)与所述驱动模块(30)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述驱动模块(30),以供所述驱动模块(30)控制所述信号输出端输出预置电平信号,使所述开关管(Q)关断。
- 如权利要求64所述的电磁加热电路,其特征在于,所述保护模块(240)与所述控制芯片(10)连接,并当检测到所述第二端的电流大于预设值时,输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调整输出至所述驱动模块(30)的脉宽调制信号的占空比。
- 如权利要求60所述的电磁加热电路,其特征在于,所述电磁加热电路还包括用于检测所述开关管(Q)温度的温度传感器(150),所述温度传感器(150)与所述保护模块(240)连接,所述保护模块(240)根据所述温度传感器(150)检测的温度输出控制信号至所述驱动模块(30)或所述控制芯片(10),以供所述驱动模块(30)或所述控制芯片(10)根据所述控制信号调整所述信号输出端输出脉宽调制信号的占空比或使所述开关管(Q)关断。
- 如权利要求60所述的电磁加热电路,其特征在于,所述开关管(Q)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 一种电磁加热电路,其特征在于,包括控制芯片(10)、驱动模块(30)和开关管(Q);其中,所述开关管(Q)具有第一端、第二端和用于控制第一端与第二端连通状态的控制端;所述控制端与所述驱动模块(30)的信号输出端连接;所述控制芯片(10)用于输出脉宽调制信号所述驱动模块(30),所述脉宽调制信号经过所述驱动模块(30)的信号输出端输出至所述开关管(Q),以驱动所述开关管(Q);驱动模块(30)用于检测所述信号输出端的输出电压大小,并根据所述信号输出端的输出电压大小是否属于预置区间范围调整所述信号输出端输出所述脉宽调制信号的状态。
- 如权利要求69所述的电磁加热电路,其特征在于,所述驱动模块(30)还用于将接收到的所述脉宽调制信号与预置的基准方波信号进行比较,并根据比较的结果调整所述信号输出端输出的脉宽调制信号的状态。
- 如权利要求70所述的电磁加热电路,其特征在于,所述驱动模块(30)根据比较的结果调整所述信号输出端输出的脉宽调制信号的状态包括:当所述驱动模块(30)接收到的脉宽调制信号的脉宽大于所述基准方波信号的脉宽时,所述驱动模块(30)控制所述信号输出端输出的脉宽调制信号对应周期内的脉宽调整为所述基准方波信号的脉宽,和或者或控制所述信号输出端停止输出的脉宽调制信号;或者当所述驱动模块(30)接收到的脉宽调制信号的脉宽大于所述基准方波信号的脉宽时,所述驱动模块(30)输出控制信号至所述控制芯片(10),以供所述控制芯片(10)调整输出至所述驱动模块(30)的脉宽调制信号的状态。
- 如权利要求69所述的电磁加热电路,其特征在于,所述驱动模块(30)根据所述信号输出端的输出电压大小是否属于预置区间范围调整所述信号输出端输出所述脉宽调制信号的状态包括:当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动模块(30)控制所述信号输出端停止输出的脉宽调制信号;或者当所述信号输出端的输出电压大小不属于预置区间范围时,所述驱动模块(30)输出控制信号至所述控制芯片(10),以供所述控制芯片(10)停止输出所述脉宽调制信号。
- 如权利要求69所述的电磁加热电路,其特征在于,所述控制芯片(10)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 如权利要求73所述的电磁加热电路,其特征在于,所述驱动模块(30)还用于检 测所述绝缘栅双极型晶体管的集电极与发射极之间的电压,并当所述绝缘栅双极型晶体管开通时,根据开通瞬间所述绝缘栅双极型晶体管的集电极与发射极之间的电压确定所述绝缘栅双极型晶体管的工作状态,根据所述工作状态调整所述信号输出端的输出电压上升到第二预设值的时间。
- 如权利要求74所述的电磁加热电路,其特征在于,所述工作状态包括启动、硬开和正常;所述根据工作状态调整所述信号输出端的输出电压上升到第二预设值的时间包括:当所述工作状态为启动时,所述信号输出端的电压上升到第二预设值的时间为第一阈值;当所述工作状态为硬开时,所述信号输出端的电压上升到第二预设值的时间为第二阈值;当所述工作状态为正常时,所述信号输出端的电压上升到第二预设值的时间为第三阈值;
- 如权利要求74所述的电磁加热电路,其特征在于,所述驱动模块(30)的电压检测端与所述绝缘栅双极型晶体管的集电极连接,接地端与所述绝缘栅双极型晶体管的发射极连接。
- 一种电磁加热控制电路,其特征在于,包括开关管(Q)、用于采集开关管(Q)温度的温度检测模块(310)、用于输出脉宽调制信号的控制芯片(10)和用于对所述脉宽调制信号进行驱动放大后输出至所述开关管(Q)的驱动电路(30);所述开关管(Q)具有第一端、第二端和用于控制第一端与第二端连通状态的控制端;所述控制端与所述驱动电路(30)的信号输出端连接;所述温度检测模块(310)的输出端与所述控制芯片(10)连接;所述控制芯片(10)用于每隔第一预置时间段获取所述温度检测模块(310)当前检测的温度值,并根据连续两次检测的温度值和所述温度补偿因子算当前检测的温度值进行误差校正后的实际温度值;并根据所述实际温度值控制所述开关管(Q)的工作状态。
- 如权利要求78所述的电磁加热控制电路,其特征在于,所述控制芯片(10)用于每隔第一预置时间段获取所述温度检测模块(310)当前检测的温度值,并根据连续两次检测的温度值和所述温度补偿因子算当前检测的温度值进行误差校正后的实际温度值具体为:所述控制芯片(10)每隔第一预置时间段获取温度检测模块(310)检测的温度值,并根据当前检测的温度值Xm和上一次检测的温度值Xm-1获取当前检测的温度值Xm和上一次检测的温度值Xm-1之间的差值对应的补偿因子A,根据所述当前检测的温度值Xm、上一次检测的温度值Xm-1和补偿因子A计算所述实际温度值Ym,Ym满足:Ym=Xm-1+A(Xm-Xm-1)。
- 如权利要求77所述的电磁加热控制电路,其特征在于,所述温度检测模块(310)包括温度传感器(RT)、第三一电阻(3R1)、第三二电阻(3R2)和第三一电容(3C1),所述第三一电阻(3R1)的一端与第一预置电源连接,另一端通过所述温度传感器(RT)与接地端连接;所述第三二电阻(3R2)的一端连接至所述第三一电阻(3R1)与所述温度传感器(RT)的公共端,另一端通过第三一电容(3C1)与接地端连接,所述第三二电阻(3R2)和第三一电容(3C1)的公共端连接至所述控制芯片(10)的温度信号采集端。
- 如权利要求77所述的电磁加热控制电路,其特征在于,所述驱动电路(30)包括驱动集成芯片31、第三三电阻(3R3)、第一六电阻(R16)、第一五电阻(R15)、第一七电阻(R17)和第三二电容(3C2),其中所述驱动集成芯片31的脉宽调制信号输入端通过第三三电阻(3R3)与所述控制芯片(10)连接,驱动电压输入端与第二预置电源连接,脉宽调制信号输出端通过第一六电阻(R16)与所述开关管(Q)的控制端连接;所述第一五电阻(R15)的一端与所述第二预置电源连接,另一端连接至所述第三三电阻(3R3)与所述控制芯片(10)的公共端;所述第一七电阻(R17)的一端与所述开关管(Q)的控制端连接,另一端与所述开关管(Q)的第二端连接;所述第三二电容(3C2)的一端与所述驱动电压输入端连接,另一端与接地端连接。
- 如权利要求81所述的电磁加热控制电路,其特征在于,所述驱动电路(30)还包括稳压二极管(D),所述稳压二极管(D)的阳极与所述开关管(Q)的第二端连接,阴极 与所述开关管(Q)的控制端连接。
- 如权利要求77所述的电磁加热控制电路,其特征在于,所述开关管(Q)为绝缘栅双极型晶体管,所述第一端为所述绝缘栅双极型晶体管的集电极,所述第二端为所述绝缘栅双极型晶体管的发射极,所述控制端为所述绝缘栅双极型晶体管的门极。
- 如权利要求77所述的电加热驱动保护电路,其特征在于,所述电加热驱动保护电路还包括蜂鸣器电路(340),所述蜂鸣器电路(340)与所述控制芯片(10)连接。
- 一种浪涌保护电路,其特征在于,包括由电阻和电容组成的第一分压电路(410)、用于对市电进行整流的整流电路(70)、用于进行浪涌保护的控制电路(430);所述控制电路(430)包括第一比较器(301);所述第一分压电路(410)的输入端与所述整流电路(70)的输出端连接,所述第一分压电路(410)的输出端与所述第一比较器(301)的第一输入端连接;所述第一比较器(301)的第二输入端与预置的第一标准电源连接,并当所述市电在电压小于第一预设值的状态下,当存在正向浪涌时,所述第一分压电路(410)的输出端的电压大于所述第一标准电源的电压,当不存在正向浪涌时,所述第一分压电路(410)的输出端的电压小于所述第一标准电源的电压;所述控制电路(430)根据所述第一比较器(301)输出端输出电平的状态进行浪涌保护控制。
- 如权利要求85所述的浪涌保护电路,其特征在于,所述第一分压电路(410)包括第一电阻(R1)、第二电阻(R2)和第一电容,所述第一电阻(R1)的一端与所述整流电路(70)的输出端连接,另一端通过所述第二电阻(R2)与接地端连接;所述第一电容并联于所述第二电阻(R2)的两端;所述第一比较器(301)的第一输入端连接至所述第一电阻(R1)和第二电阻(R2)的公共端。
- 如权利要求85所述的浪涌保护电路,其特征在于,所述浪涌保护电路还包括由电阻和电容组成的第二分压电路(40)和第三分压电路(50),所述控制电路(430)还包括第二比较器(32)和第三比较器(33);所述第二分压电路(40)的输入端与所述整流电路(70)的输出端连接,所述第二分压电路(40)的输出端与所述第二比较器(32)的第一输入端连接,所述第二比较器(32)的 第二输入端与所述第一分压电路(410)的输出端连接;且当所述市电不存在正向浪涌电压时,所述第一分压电路(410)的输出端的电压大于所述第二分压电路(40)的输出端的电压;当所述市电存在正向浪涌电压时,所述第一分压电路(410)的输出端的电压小于所述第二分压电路(40)的输出端的电压;所述第三分压电路(50)的输入端与所述整流电路(70)的输出端连接,所述第三分压电路(50)的输出端与所述第三比较器(33)的第一输入端连接,所述第三比较器(33)的第二输入端与预置的第二标准电源连接,用于检测所述市电的过零点,并当所述第三分压电路(50)的输出端电压小于第二预设值时,控制所述第二比较器(32)的输出端输出预置电平信号。
- 如权利要求87所述的浪涌保护电路,其特征在于,所述第二分压电路(40)包括第三电阻(R3)、第四电阻(R4)和第二电容,所述第三电阻(R3)的一端与所述整流电路(70)的输出端连接,另一端通过所述第四电阻(R4)与接地端连接;所述第二电容并联于所述第四电阻(R4)的两端;所述第二比较器(32)的第一输入端连接至所述第三电阻(R3)和第四电阻(R4)的公共端。
- 如权利要求87所述的浪涌保护电路,其特征在于,所述第三分压电路(50)包括第五电阻(R5)、第六电阻(R6)、第七电阻(R7)、第三电容和第四电容,所述第五电阻(R5)的一端与所述整流电路(70)的输出端连接,另一端通过所述第六电阻(R6)和第七电阻(R7)依次串接后与接地端连接;所述第三电容并联于所述第五电阻(R5)的两端;所述第四电容并联于所述第七电阻(R7)的两端;所述第三比较器(33)的第一输入端连接至所述第六电阻(R6)和第七电阻(R7)的公共端。
- 如权利要求87所述的浪涌保护电路,其特征在于,所述浪涌保护电路还包括由电阻和电容组成的第四分压电路(60),所述控制电路(430)还包括第四比较器(34);所述第四分压电路(60)的输入端与所述整流电路(70)的输出端连接,所述第四分压电路(60)的输出端与所述第四比较器(34)的第一输入端连接,所述第四比较器(34)的第二输入端与所述第二分压电路(40)的输出端连接;且当所述市电不存在负向浪涌电压时,所述第四分压电路(60)的输出端的电压小于所述第二分压电路(40)的输出端的电压;当所述市电存在负向浪涌电压时,所述第四分压电路(60)的输出端的电压大于所述第二分压电路(40)的输出端的电压;所述第三比较器(33)还用于当所述第三分压电路(50)的输出端电压小于第二预设值时,控制所述第四比较器(34)的输出端输出预置电平信号。
- 如权利要求90所述的浪涌保护电路,其特征在于,所述第四分压电路(60)包括第八电阻(R8)、第九电阻(R9)和第五电容,所述第八电阻(R8)的一端与所述整流电路(70)的输出端连接,另一端通过所述第九电阻(R9)与接地端连接;所述第五电容并联于所述第九电阻(R9)的两端;所述第四比较器(34)的第一输入端连接至所述第八电阻(R8)和第九电阻(R9)的公共端。
- 如权利要求85所述的浪涌保护电路,其特征在于,所述整流电路(70)包括第一二极管(D1)和第二二极管(D2),所述第一二极管(D1)的阳极与所述市电的第一交流输入端连接,所述第二二极管(D2)与所述市电的第二交流输入端连接,所述第一二极管(D1)的阴极与所述第二二极管(D2)的阴极连接。
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