CN217279339U - Heating control circuit - Google Patents
Heating control circuit Download PDFInfo
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- CN217279339U CN217279339U CN202221103941.4U CN202221103941U CN217279339U CN 217279339 U CN217279339 U CN 217279339U CN 202221103941 U CN202221103941 U CN 202221103941U CN 217279339 U CN217279339 U CN 217279339U
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Abstract
The utility model discloses a control circuit generates heat, include: the power supply module is used for supplying power to the main control module and supplying power to the heating module through the main control module; the sensor signal detection module is used for outputting a sensor signal to the main control module; the input voltage detection module is used for detecting the input voltage of the heating module and outputting a voltage detection signal to the main control module; the main control module is used for switching on or off the input current of the development thermal module according to the sensor signal and the voltage detection signal; and the heating module is used for heating when the input current is switched on and stopping heating when the input current is switched off. This application acquires the input voltage of the module that generates heat in real time through setting up input voltage detection module to through the input current of main control module according to voltage detection signal and sensor signal on-off development thermal module, thereby adjust the power of the module that generates heat in real time.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a control circuit generates heat.
Background
The electronic cigarette comprises a cigarette rod and a cigarette cartridge. Wherein the smoke cartridge comprises an atomizing device, a heating wire in the atomizing device generates heat after being electrified, and the heat generated by the heating wire atomizes the tobacco tar in the smoke cartridge to form smoke. The electron cigarette is provided with control circuit, when judging that the user inhales through the miaow head, controls the battery through control circuit and supplies power to the heater, makes the heater generate heat to atomizing tobacco tar. The existing electronic cigarette product only controls the battery to supply power to the heating wire through a sensor signal, does not detect the input voltage of the heating wire in real time and adjusts the input voltage, and cannot adjust the power of the heating wire in time when the voltage of the battery changes, so that the atomization effect of tobacco tar is unstable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that: the utility model provides a control circuit generates heat to solve prior art can't be through the problem of adjusting the power of heater.
In order to solve the technical problem, the utility model discloses a technical scheme be:
a heat generation control circuit comprising: the device comprises a sensor signal detection module, an input voltage detection module, a power supply module, a main control module and a heating module;
the power supply module is electrically connected with the main control module and is used for supplying power to the main control module and supplying power to the heating module through the main control module;
the sensor signal detection module is electrically connected with the main control module and is used for outputting a sensor signal to the main control module;
the input voltage detection module is respectively and electrically connected with the main control module and the heating module, and is used for detecting the input voltage of the heating module and outputting a voltage detection signal to the main control module;
the main control module is electrically connected with the heating module and is used for switching on or switching off the input current of the heating module according to the sensor signal and the voltage detection signal;
the heating module is used for heating when the input current is switched on and stopping heating when the input current is switched off.
Further, the sensor signal detection module includes: the device comprises a first receiving unit, a second receiving unit, a first signal detection unit, a second signal detection unit and a signal operation unit;
the first receiving unit is electrically connected with the first signal detection unit and is used for acquiring a noise signal and outputting a corresponding first voltage signal to the first signal detection unit;
the first signal detection unit is electrically connected with the signal operation unit and is used for outputting a first count value to the signal operation unit according to the first voltage signal;
the second receiving unit is electrically connected with the second signal detection unit and is used for acquiring a sensor signal and outputting a corresponding second voltage signal to the second signal detection unit;
the second signal detection unit is electrically connected with the signal operation unit and is used for outputting a second count value to the signal operation unit according to the second voltage signal;
the signal operation unit is electrically connected with the main control module and is used for operating the first counting value and the second counting value of two adjacent periods in sequence and outputting a noise-eliminating sensor signal to the main control module according to an operation result.
Further, the first signal detection unit includes: the voltage detection circuit comprises a first gating unit, a first voltage detection unit, a first counting unit and a first control unit;
the first gating unit is electrically connected with the first voltage detection unit and the first receiving unit respectively, and is used for controlling the first receiving unit to output the first voltage signal and outputting the first voltage signal to the first voltage detection unit;
the first voltage detection unit is connected with the first counting unit and is used for comparing the first voltage signal with a first preset voltage threshold and outputting a first comparison result to the first counting unit;
the first counting unit is connected with the signal operation unit and used for counting according to the first comparison result and outputting a first counting value to the signal operation unit after counting is finished;
the first control unit is respectively connected with the first gating unit, the first voltage detection unit and the first counting unit, and is used for controlling the first gating unit to gate, enabling the first voltage detection unit and the first counting unit, and enabling the first counting unit to clear the counting value.
Further, the second signal detection unit includes: the first gating unit, the first voltage detection unit, the first counting unit and the first control unit are connected with the first voltage detection unit;
the second gating unit is electrically connected with the second voltage detection unit and the second receiving unit respectively, and is used for controlling the second receiving unit to output the second voltage signal and outputting the second voltage signal to the second voltage detection unit;
the second voltage detection unit is connected with the second counting unit and is used for comparing the second voltage signal with a second preset voltage threshold and outputting a second comparison result to the second counting unit;
the second counting unit is connected with the signal operation unit and is used for counting according to the second comparison result and outputting a second counting value to the signal operation unit after counting is finished;
the second control unit is respectively connected with the second gating unit, the second voltage detection unit and the second counting unit, and is used for controlling the second gating unit to gate, enabling the second voltage detection unit and the second counting unit, and enabling the second counting unit to clear the counting value.
Further, the first gating unit includes: a first switch, a second switch, and a third switch;
the input end of the first switch is connected with the power supply module, the output end of the first switch is respectively connected with the first receiving unit, the input end of the second switch and the first voltage detection unit, the output end of the second switch is grounded, the input end of the third switch is connected with the first receiving unit, and the output end of the third switch is grounded.
Further, the second gating unit includes: a fourth switch, a fifth switch, and a sixth switch;
the input end of the fourth switch is connected with the power supply module, the output end of the fourth switch is respectively connected with the second receiving unit, the input end of the fifth switch and the second voltage detection unit, the output end of the fifth switch is grounded, the input end of the sixth switch is connected with the second receiving unit, and the output end of the sixth switch is grounded.
Further, the first receiving unit includes: a first capacitor and a second capacitor;
one end of the first capacitor is connected with the output end of the first switch, the input end of the second switch, one end of the second capacitor and the first voltage detection unit respectively, the other end of the first capacitor is grounded, and the other end of the second capacitor is connected with the input end of the third switch.
Further, the second receiving unit includes: the sensor comprises a third capacitor and a fourth capacitor, wherein the fourth capacitor is an equivalent capacitor of the sensor;
one end of the fourth capacitor is connected with the output end of the fourth switch, the input end of the fifth switch, one end of the third capacitor and the second voltage detection unit respectively, the other end of the fourth capacitor is grounded, and the other end of the third capacitor is connected with the input end of the sixth switch.
Furthermore, the input voltage detection module comprises a first resistor, one end of the first resistor is connected with the main control module, and the other end of the first resistor is connected with the current input end of the heating module.
Furthermore, the heating control circuit further comprises a child lock button, the input end of the child lock button is connected with the power supply module, and the output end of the child lock button is connected with the main control module.
The beneficial effects of the utility model reside in that: the input voltage of the heating module is acquired in real time by arranging the input voltage detection module, and the input current of the heat module is developed by switching on or off according to the voltage detection signal and the sensor signal through the main control module, so that the power of the heating module is adjusted in real time.
Drawings
Fig. 1 is a schematic block diagram of a heating control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a heating control circuit according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a sensor signal detection module according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a sensor signal detection module according to an embodiment of the present invention;
fig. 5 is another schematic diagram of a sensor signal detection module according to an embodiment of the present invention;
fig. 6 is a first workflow block diagram of a sensor signal detection module according to an embodiment of the present invention;
fig. 7 is a second workflow block diagram of a sensor signal detection module according to an embodiment of the present invention;
fig. 8 is a first flowchart of a detection method according to an embodiment of the present invention;
fig. 9 is a second flow chart of the detection method according to the embodiment of the present invention;
fig. 10 is a schematic diagram of a schmitt trigger in accordance with an embodiment of the present invention;
fig. 11 is a graph showing input-output characteristics of a schmitt trigger according to an embodiment of the present invention.
Description of reference numerals:
100. a sensor signal detection module; 110. a first receiving unit; 120. a second receiving unit; 130. a first signal detection unit; 131. a first gating unit; 132. a first voltage detection unit; 133. a first counting unit; 134. a first control unit; 140. a second signal detection unit; 141. a second gating unit; 142. a second voltage detection unit; 143. a second counting unit; 144. a second control unit; 150. a signal arithmetic unit; 200. an input voltage detection module; 300. a power supply module; 400. a main control module; 500. and a heat generating module.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Example one
Referring to fig. 1 to 11, a first embodiment of the present invention is:
a heating control circuit is applied to electronic cigarette products and can also be applied to equipment or products needing to be subjected to power control of heating devices.
Referring to fig. 1, a heating control circuit includes a sensor signal detection module 100, an input voltage detection module 200, a power supply module 300, a main control module 400, and a heating module 500; the power module 300 is electrically connected to the main control module 400, and the power module 300 is configured to supply power to the main control module 400 and supply power to the heat generating module 500 through the main control module 400; the sensor signal detection module 100 is electrically connected to the main control module 400, and the sensor signal detection module 100 is configured to output a sensor signal to the main control module 400; the input voltage detection module 200 is electrically connected to the main control module 400 and the heating module 500, respectively, and the input voltage detection module 200 is configured to detect an input voltage of the heating module 500 and output a voltage detection signal to the main control module 400; the main control module 400 is electrically connected to the heating module 500, and the main control module 400 is configured to turn on or off an input current of the heating module 500 according to the sensor signal and the voltage detection signal; the heating module 500 is used for heating when the input current is switched on and stopping heating when the input current is switched off. The sensor signal detection module 100 includes an external capacitive sensor, such as a microphone sensor M1 in the present embodiment; the heat generating module 500 includes a heat generating wire AT 1.
The working principle of the heating control circuit in the embodiment is as follows: when a user inhales through the microphone sensor M1, the sensor signal detection module 100 detects an inhalation action, outputs a sensor signal to the main control module 400, and the main control module 400 conducts an input current of the heating module 500 according to the sensor signal, so that the heating module 500 heats; when the microphone is not in operation, the main control module 400 will disconnect the input current of the heat generating module 500. The main control module 400 compares the voltage detection signal of the voltage detection module with a preset input voltage threshold, and when the voltage detection signal reaches or is greater than the preset input voltage threshold, the main control module 400 controls the input current of the heating module 500 according to the sensor signal; when the voltage detection signal does not reach the preset input voltage threshold, it is determined that the heating module 500 is in an overcurrent state, and no matter what state the sensor signal detection module 100 is in, the main control module 400 disconnects the input current of the heating module 500, thereby adjusting the power of the heating module 500.
It can be understood that, in the present embodiment, by providing the input voltage detection module 200, the input voltage of the heating module 500 is obtained in real time, and the main control module 400 turns on or off the input current of the developing thermal module 500 according to the voltage detection signal and the sensor signal, which is beneficial to adjusting the power of the heating module 500 in real time.
Referring to fig. 2, in the present embodiment, the main control module 400 and a part of the circuit structure of the sensor signal detecting module 100 are integrated in the same integrated circuit U1, and the main control chip includes a power switch for turning on or off the input current of the heat generating module 500, and a control chip for receiving the sensor signal and the voltage detecting signal. The power switch can be a triode circuit or a field effect transistor circuit, the power switch is connected with the power module 300 through a first port of the integrated circuit U1 to receive a supply current, and is connected with the input end of the heating wire AT1 through an output port OUT of the integrated circuit U1 to input a current to the heating wire AT1, and the output end of the heating wire AT1 is grounded; the control chip is connected with an output voltage detection module through a ninth port of the integrated circuit U1 to receive the voltage detection signal, and is also connected with the power switch to control the on and off of the power switch. One end of the microphone sensor M1 is connected to the seventh port of the integrated circuit U1, and the other end of the microphone sensor is grounded.
Specifically, the input voltage detecting module 200 includes a first resistor R1, one end of the first resistor R1 is connected to the main control module 400, and the other end of the first resistor R1 is connected to one end of the heating wire AT 1. Specifically, one end of the first resistor R1 is connected to the ninth port of the integrated circuit U1, the other end of the first resistor R1 is connected to the output port OUT of the integrated circuit U1 and the input end of the heater AT1, and the first resistor R1 is an isolation resistor. It can be understood that the main control module 400 receives the voltage detection signal through the ninth port of the integrated circuit U1, and compares the voltage detection signal with the preset input voltage threshold, and when the voltage detection signal reaches or exceeds the preset input voltage threshold, the main control module 400 controls the input current of the heating module 500 according to the sensor signal; when the voltage detection signal does not reach the preset input voltage threshold, it is determined that the heating module 500 is in an overcurrent state, and no matter what state the sensor signal detection module 100 is in, the main control module 400 disconnects the input current of the heating module 500, thereby adjusting the power of the heating module 500.
Further, the heating control circuit further comprises a child lock KEY, an input end of the child lock KEY is connected to the power module 300, and an output end of the child lock KEY is connected to the main control module 400. Specifically, the output end of the child lock KEY is connected to the ninth port of the integrated circuit U1. In this embodiment, the child lock KEY outputs a child lock opening signal or a child lock closing signal to the main control module 400 through a ninth port of the integrated circuit U1, and for example, if the child lock KEY is pressed for 5 times consecutively, a child lock state is opened; and continuously pressing the key for 5 times to close the child lock state.
It can be understood that the main control module 400 turns on or off the input current of the heating wire AT1 according to the received voltage detection signal, the child lock signal and the sensor signal. When the sensor signal detection module 100 does not detect that the user inhales through the microphone, the main control module 400 closes the output port OUT of the integrated circuit U1 to disconnect the input current of the heating module 500; when the sensor signal detection module 100 detects that a user inhales through the microphone but is in a child lock state or an overcurrent state, the main control module 400 closes the output port OUT of the integrated circuit U1 to disconnect the input current of the heating module 500; when the sensor signal detecting module 100 detects that the user inhales through the microphone, and is in a non-child-lock state and a non-overcurrent state, the main control module 400 turns on the output port OUT of the integrated circuit U1 to conduct the input current of the heating module 500, so that the heating module 500 heats. The output voltages of the power modules 300 are different, and the main control module 400 can maintain the power of the heat generating module 500 unchanged by adjusting the duty ratio of the output signal of the output port OUT of the integrated circuit U1. Illustratively, the heating wire AT1 is heated for a single time of AT most 10 seconds, that is, after 10 seconds after the microphone sensor is triggered, the main control module 400 closes the ninth port of the integrated circuit U1, and stops heating the heating wire AT 1. In addition, the ninth port of the integrated circuit U1 is adopted for receiving the voltage detection signal and the child lock signal, so that the function multiplexing of a single port is realized.
In this embodiment, the heat generation control circuit further includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fifth capacitor C5, and an indicator light D1. One end of the second resistor R2 is connected to one ends of the power module 300 and the fifth resistor R5, respectively, the other end of the second resistor R2 is connected to the tenth port of the integrated circuit U1, one end of the child lock KEY and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the sixth port of the integrated circuit U1; the other end of the fifth resistor R5 is connected with the anode of the indicator light D1, and the cathode of the indicator light D1 is connected with the sixth port of the integrated circuit U1; one end of the third resistor R3 is connected to the power module 300 and the first port of the integrated circuit U1, the other end of the third resistor R3 is connected to the second port of the integrated circuit U1 and one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to the third port of the integrated circuit U1 and the ground.
The third resistor R3 and the fifth capacitor C5 form a filter circuit, and provide a stable voltage for the second port of the integrated circuit U1. The second resistor R2 and the fourth resistor R4 are power supply voltage detection resistors, and the fifth resistor R5 is a current limiting resistor. The indicator light D1 is used to indicate different working states of the circuit, for example, the normal lighting indicates that the heating wire AT1 is in a normal working state, the flashing indicates that the heating wire AT1 is in a child-lock state, and the extinguishing indicates that the heating wire AT1 is in a heating stop state.
It can be understood that, when the sixth port of the integrated circuit U1 is at low level, the integrated circuit U1 obtains the voltage value of the power supply voltage VCC by detecting the voltage VCTRL at the tenth port and by applying the common VCC ═ VCTRL (R2/R4+ 1).
Example two
A capacitive sensor is a conversion device for converting a measured physical quantity into a capacitance variation, and can be regarded as a capacitor with variable parameters, such as an inhalation microphone sensor and a touch capacitive sensor, which are widely used at present, but the capacitive sensor is easily interfered by environmental noise when in operation.
In the prior art, a sensor signal detection method applied to a capacitive sensor only adopts a sensor signal detection loop for detection, and corrects the influence of environmental variables such as voltage, temperature and the like through a compensation method, but the method and a corresponding circuit structure can not completely eliminate the influence of the environmental variables, and the sensitivity is poor particularly when weak sensor signals are detected.
Referring to fig. 3 to 7, and fig. 10 and 11, in order to better eliminate the influence of the environmental variable, the second embodiment improves the sensor signal detection module 100 on the basis of the first embodiment.
Referring to fig. 3, in the present embodiment, the sensor signal detecting module 100 includes: a first receiving unit 110, a second receiving unit 120, a first signal detecting unit 130, a second signal detecting unit 140, and a signal computing unit 150; the first receiving unit 110 is electrically connected to the first signal detecting unit 130, and the first receiving unit 110 is configured to obtain a noise signal and output a corresponding first voltage signal to the first signal detecting unit 130; the first signal detecting unit 130 is electrically connected to the signal computing unit 150, and the first signal detecting unit 130 is configured to output a first count value to the signal computing unit 150 according to the first voltage signal; the second receiving unit 120 is electrically connected to the second signal detecting unit 140, and the second receiving unit 120 is configured to obtain a sensor signal and output a corresponding second voltage signal to the second signal detecting unit 140; the second signal detecting unit 140 is electrically connected to the signal computing unit 150, and the second signal detecting unit 140 is configured to output a second count value to the signal computing unit 150 according to the second voltage signal; the signal operation unit 150 is electrically connected to the main control module 400, and the signal operation unit 150 is configured to operate the first count value and the second count value of two adjacent cycles in sequence, and output a noise-canceling sensor signal to the main control module 400 according to an operation result.
The working principle of the sensor signal detection module 100 in this embodiment is as follows: the second receiving unit 120 receives the initial sensor signal and outputs a second voltage signal, the first receiving unit 110 receives the noise signal and outputs a first voltage signal, the second voltage signal outputs a second count value after passing through the second signal detecting unit 140, the first voltage signal outputs a first count value after passing through the first signal detecting unit 130, the signal operating unit 150 operates the first count value and the second count value of two adjacent periods in sequence, and outputs the noise-canceling sensor signal according to the operation result.
The sensor signal detecting module 100 further includes a first sensor signal output port SO1 and a second sensor signal output port SO2 connected to the main control module 400, and the signal arithmetic unit 150 outputs a noise-canceling sensor signal through the first sensor signal output port SO1 and the second sensor signal output port SO 2. The sensor signal is detected as: when the microphone sensor inhales, the capacitance value of the equivalent capacitor begins to change, the state that the microphone sensor starts to inhale and the state that the microphone sensor finishes inhaling are judged, and the state that the microphone sensor starts to inhale is judged when the signal output port SO1 of the first sensor is at a high level; when the second sensor signal output port SO2 is at a high level, the microphone sensor is in a state of ending inhalation; when both the first sensor signal output port SO1 and the second sensor signal output port SO2 are at a low level, the microphone sensor is in a non-inhalation state.
Illustratively, the process of outputting the noise-canceling sensor signal to the operation result is: setting an operation parameter M and a preset operation threshold N, comparing the operation parameter M with the preset operation threshold N, and outputting an operation result. When M is larger than or equal to N, the first sensor signal output port SO1 outputs a high level; when M is less than or equal to-N, the second sensor signal output port SO2 outputs a high level; when-N < M < N, the first sensor signal port SO1 and the second sensor signal port SO2 both output a low level.
It can be understood that, in this embodiment, the noise signal and the initial sensor signal are obtained simultaneously, the corresponding count values are obtained respectively, the count values in two adjacent periods are then calculated, the environmental noise component of the sensor signal is eliminated according to the calculation result, the sensor signal is prevented from being interfered, and the sensitivity of signal detection is enhanced.
The first signal detecting unit 130, the second signal detecting unit 140 and the signal computing unit 150 may be integrated on a single integrated circuit, or may be used as one of the sub-circuits of an upper level circuit or an upper level system, and the first receiving unit 110 and the second receiving unit 120 are external circuits.
Referring to fig. 4, the first signal detecting unit 130 includes: a first gating unit 131, a first voltage detection unit 132, a first counting unit 133, and a first control unit 134; the first gating unit 131 is electrically connected to the first voltage detecting unit 132 and the first receiving unit 110, respectively, and the first gating unit 131 is configured to control the first receiving unit 110 to output the first voltage signal and output the first voltage signal to the first voltage detecting unit 132; the first voltage detection unit 132 is connected to the first counting unit 133, and the first voltage detection unit 132 is configured to compare the first voltage signal with a first preset voltage threshold and output a first comparison result to the first counting unit 133; the first counting unit 133 is connected to the signal operation unit 150, and the first counting unit 133 is configured to count according to the first comparison result and output a first count value to the signal operation unit 150 after counting is completed; the first control unit 134 is respectively connected to the first gating unit 131, the first voltage detection unit 132, and the first counting unit 133, and the first control unit 134 is configured to control the first gating unit 131 to gate, enable the first voltage detection unit 132 and the first counting unit 133, and clear a count value of the first counting unit 133.
In this embodiment, the first gating unit 131 is connected to an input power supply, and the first control unit 134 controls on or off of a plurality of switches in the first gating unit 131 to charge or discharge the first receiving unit 110, so as to control the first receiving unit 110 to convert the noise signal into a first voltage signal. When the first voltage signal is smaller than the first preset voltage threshold, the first counting unit 133 performs one-time counting, and when the first voltage signal reaches or is greater than the first preset voltage threshold, the first counting unit 133 stops counting and outputs the first count value.
The first voltage detection unit 132 specifically includes a schmitt trigger, fig. 10 is a circuit structure of a commonly used schmitt trigger, please refer to fig. 11, when the input voltage VIN is lower than the negative threshold voltage VIL, the output voltage VOUT is high; when the input voltage VIN is higher than the forward threshold voltage VIH, the output voltage VOUT is low; the output voltage VOUT changes from high to low when the input voltage VIN rises from less than a negative threshold voltage VIL to a positive threshold voltage VIH; when the input voltage VIN is decreased from greater than the positive threshold voltage VIH to the negative threshold voltage VIL, the output voltage VOUT changes from low to high; when the input voltage VIN varies between the negative threshold voltage VIL and the positive threshold voltage VIH, the state of the output voltage VOUT does not change. The schmitt trigger exhibits hysteresis characteristics and has good interference immunity, and in other embodiments, the first voltage detection unit 132 may also adopt other logic circuits or logic chips.
Referring to fig. 5, the second signal detecting unit 140 includes: a second gating unit 141, a second voltage detecting unit 142, a second counting unit 143, and a second control unit 144; the second gating unit 141 is electrically connected to the second voltage detecting unit 142 and the second receiving unit 120, respectively, and the second gating unit 141 is configured to control the second receiving unit 120 to output the second voltage signal and output the second voltage signal to the second voltage detecting unit 142; the second voltage detection unit 142 is connected to the second counting unit 143, and the second voltage detection unit 142 is configured to compare the second voltage signal with a second preset voltage threshold, and output a second comparison result to the second counting unit 143; the second counting unit 143 is connected to the signal operation unit 150, and the second counting unit 143 is configured to count according to the second comparison result and output a second count value to the signal operation unit 150 after the counting is completed; the second control unit 144 is respectively connected to the second gating unit 141, the second voltage detection unit 142, and the second counting unit 143, and the second control unit 144 is configured to control the second gating unit 141 to gate, enable the second voltage detection unit 142 and the second counting unit 143, and clear a count value of the second counting unit 143.
In this embodiment, the second gating unit 141 is connected to an input power supply, and the second control unit 144 controls on or off of a plurality of switches in the second gating unit 141 to charge or discharge the second receiving unit 120, so as to control the second receiving unit 120 to convert the initial sensor signal into a second voltage signal. When the second voltage signal is smaller than the second preset voltage threshold, the second counting unit 143 performs one-time counting, and when the second voltage signal reaches or is greater than the second preset voltage threshold, the second counting unit 143 stops counting and outputs the second count value. The second voltage detection unit 142 may have the same circuit structure as the first voltage detection unit 132, and the first counting unit 133 and the second counting unit 143 both count through a counter and output count values to the signal operation unit 150 through respective SIG ports after the counting is completed.
Specifically, the first gating unit 131 includes: a first switch S1, a second switch S2, and a third switch S3; the input terminal of the first switch S1 is connected to the power module 300, the output terminal of the first switch S1 is connected to the input terminals of the first receiving unit 110, the second switch S2 and the first voltage detecting unit 132, the output terminal of the second switch S2 is grounded, the input terminal of the third switch S3 is connected to the first receiving unit 110, and the output terminal of the third switch S3 is grounded. Further, the first receiving unit 110 includes: a first capacitor C1 and a second capacitor C2; one end of the first capacitor C1 is connected to the output terminal of the first switch S1, the input terminal of the second switch S2, one end of the second capacitor C2, and the first voltage detection unit 132, respectively, the other end of the first capacitor C1 is grounded, and the other end of the second capacitor C2 is connected to the input terminal of the third switch S3.
The heat generation control circuit further includes a first port ND and a second port ND2, wherein one end of the first capacitor C1 is connected to the output terminal of the first switch S1, the input terminal of the second switch S2, one end of the second capacitor C2 and the first voltage detection unit 132 through the first port ND; the other end of the second capacitor C2 is connected to the input terminal of the third switch S3 through the second port ND 2.
Referring to fig. 6, the working process of the first receiving unit 110 and the first signal detecting unit 130 is as follows:
s11, the first switch S1 is turned off, the second switch S2 and the third switch S3 are turned on, voltages at both ends of the first capacitor C1 and the second capacitor C2 are cleared, and the first counting unit 133 clears the first count value.
S12, the first switch S1 is closed, the second switch S2 and the third switch S3 are opened, and the voltage across the first capacitor C1 is charged to reach the input voltage of the power module 300.
S13, the first switch S1 and the second switch S2 are turned off, the third switch S3 is turned on, and the first capacitor C1 charges the second capacitor C2 to increase the voltage value of the first port ND.
S14, the first voltage detecting unit 132 detects a voltage (i.e. a first voltage signal) of the first port ND, and compares the voltage with a first preset voltage threshold.
S15, if the voltage value of the first port ND is smaller than the first predetermined voltage threshold, the first counting unit 133 increments the first count value by 1, and repeats steps S12-S14;
s16, if the voltage value of the first port ND reaches or exceeds the first predetermined voltage threshold, the first counting unit 133 ends counting, and outputs the first count value to the signal operation unit 150, so that the noise signal detection period is ended.
Specifically, the second gating unit 141 includes: a fourth switch S4, a fifth switch S5, and a sixth switch S6; an input end of the fourth switch S4 is connected to the power module 300, an output end of the fourth switch S4 is connected to the second receiving unit 120, an input end of the fifth switch S5 and the second voltage detecting unit 142, an output end of the fifth switch S5 is grounded, an input end of the sixth switch S6 is connected to the second receiving unit 120, and an output end of the sixth switch S6 is grounded. Further, the second receiving unit 120 includes: a third capacitor C3 and a fourth capacitor CS, where the fourth capacitor CS is an equivalent capacitor of the sensor M1, and a capacitance value of the fourth capacitor CS changes with a change of the measured physical quantity; one end of the fourth capacitor CS is connected to the output end of the fourth switch S4, the input end of the fifth switch S5, one end of the third capacitor C3, and the second voltage detection unit 142, respectively, the other end of the fourth capacitor CS is grounded, and the other end of the third capacitor C3 is connected to the input end of the sixth switch S6.
The heating control circuit further includes a third port SD and a fourth port SD2, and one end of the fourth capacitor CS is connected to the output terminal of the fourth switch S4, the input terminal of the fifth switch S5, one end of the third capacitor C3, and the second voltage detection unit 142 through the third port SD; the other end of the third capacitor C3 is connected to the input terminal of the sixth switch S6 through the fourth port SD 2.
Referring to fig. 7, the work flow of the second receiving unit 120 and the second signal detecting unit 140 is as follows:
s21 and the fourth switch S4 are turned off, the fifth switch S5 and the sixth switch S6 are turned on, voltages at both ends of the fourth capacitor CS and the third capacitor C3 are cleared, and the second counting unit 143 clears the second count value.
S22, the fourth switch S4 is closed, the fifth switch S5 and the sixth switch S6 are opened, and the voltage across the fourth capacitor CS is charged to the input voltage of the power module 300.
S23, the fourth switch S4 and the fifth switch S5 are opened, the sixth switch S6 is closed, and the fourth capacitor CS charges the third capacitor C3 to increase the voltage of the third port SD.
S24, the second voltage detecting unit 142 detects the voltage of the third port SD (i.e. the second voltage signal), and compares the detected voltage with a second preset voltage threshold.
S25, if the voltage value of the third port SD is smaller than the second preset voltage threshold, the second counting unit 143 increments the second count value by 1, and repeats the steps S22-S24;
s26, if the voltage value of the third port SD reaches or is greater than the second preset voltage threshold, the second counting unit 143 ends counting, and outputs the second count value to the signal operation unit 150, so that the initial sensor signal detection period ends.
EXAMPLE III
Referring to fig. 8 and 9, the present embodiment further discloses a detection method applied to the sensor signal detection module 100 according to any of the above embodiments, including the steps of:
s31, acquiring a noise signal and an initial sensor signal.
S32, in the first period, obtaining a first count value X according to the noise signal 1 And obtaining a second count value Y from the initial sensor signal 1 。
S33, in the second period, obtaining the first count value X according to the noise signal 2 And obtaining a second count value Y from the initial sensor signal 2 。
The heating control circuit performs circuit reset at the beginning of each working cycle, specifically, the first switch S1 and the fourth switch S4 are opened, and the second switch S2, the third switch S3, the fifth switch S5 and the sixth switch S6 are closed, so that voltages at two ends of each of the first capacitor C1, the second capacitor C2, the fourth capacitor CS and the third capacitor C3 are cleared; meanwhile, the first and second counting units 133 and 143 clear the first and second count values, respectively, and the first and second sensor signal output ports SO1 and SO2 output a low level at this time.
S34, calculating the first count value and the second count value of two cycles.
And S35, outputting a noise-eliminating sensor signal according to the operation result.
Wherein the first period and the second period are two periods that are sequentially adjacent.
Referring to fig. 9, the step of operating the first count value and the second count value of the two cycles further includes:
s341, setting an operation parameter M;
s342, calculating the operation parameters by the following formula:
and S343, comparing the operation parameter M with a preset operation threshold value N, and outputting an operation result.
When M is larger than or equal to N, the first sensor signal output port SO1 outputs a high level; when M is less than or equal to-N, the signal output port SO2 of the second sensor outputs a high level; when-N is more than M and less than N, the first sensor signal port and the second sensor signal port output low level. By repeating steps S32-S35, a continuous output value of the noise-canceling sensor signal is obtained.
To sum up, the present embodiment of the heating control circuit provided by the present invention obtains the input voltage of the heating module in real time by setting the input voltage detection module, and the main control module switches on or off the input current of the development thermal module according to the voltage detection signal and the sensor signal, thereby facilitating the real-time adjustment of the power of the heating module; meanwhile, a child lock key is arranged, so that the use of people with improper age is avoided.
In addition, the receiving unit is used for simultaneously acquiring an initial sensor signal and a noise signal, the signal detection unit is used for respectively acquiring corresponding counting values, the signal operation unit is used for operating the counting values, the environmental noise component of the sensor signal is eliminated according to the operation result, the weak capacitive sensor signal can be accurately detected, and the sensitivity of signal detection is enhanced. In addition, the first signal detection unit and the second signal detection unit which have the same or similar circuit structures are adopted, so that the whole circuit structure is favorably optimized.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (10)
1. A heat generation control circuit, comprising: the device comprises a sensor signal detection module, an input voltage detection module, a power supply module, a main control module and a heating module;
the power supply module is electrically connected with the main control module and is used for supplying power to the main control module and supplying power to the heating module through the main control module;
the sensor signal detection module is electrically connected with the main control module and is used for outputting a sensor signal to the main control module;
the input voltage detection module is respectively electrically connected with the main control module and the heating module, and is used for detecting the input voltage of the heating module and outputting a voltage detection signal to the main control module;
the main control module is electrically connected with the heating module and is used for switching on or switching off the input current of the heating module according to the sensor signal and the voltage detection signal;
the heating module is used for heating when the input current is switched on and stopping heating when the input current is switched off.
2. The heat generation control circuit according to claim 1, wherein the sensor signal detection module includes: the device comprises a first receiving unit, a second receiving unit, a first signal detection unit, a second signal detection unit and a signal operation unit;
the first receiving unit is electrically connected with the first signal detection unit and is used for acquiring a noise signal and outputting a corresponding first voltage signal to the first signal detection unit;
the first signal detection unit is electrically connected with the signal operation unit and is used for outputting a first count value to the signal operation unit according to the first voltage signal;
the second receiving unit is electrically connected with the second signal detection unit and is used for acquiring a sensor signal and outputting a corresponding second voltage signal to the second signal detection unit;
the second signal detection unit is electrically connected with the signal operation unit and is used for outputting a second count value to the signal operation unit according to the second voltage signal;
the signal operation unit is electrically connected with the main control module and is used for operating the first counting value and the second counting value of two adjacent periods in sequence and outputting a noise-eliminating sensor signal to the main control module according to an operation result.
3. The heat generation control circuit according to claim 2, wherein the first signal detection unit includes: the voltage detection circuit comprises a first gating unit, a first voltage detection unit, a first counting unit and a first control unit;
the first gating unit is electrically connected with the first voltage detection unit and the first receiving unit respectively, and is used for controlling the first receiving unit to output the first voltage signal and outputting the first voltage signal to the first voltage detection unit;
the first voltage detection unit is connected with the first counting unit and is used for comparing the first voltage signal with a first preset voltage threshold and outputting a first comparison result to the first counting unit;
the first counting unit is connected with the signal operation unit and used for counting according to the first comparison result and outputting a first counting value to the signal operation unit after counting is finished;
the first control unit is respectively connected with the first gating unit, the first voltage detection unit and the first counting unit, and is used for controlling the first gating unit to gate, enabling the first voltage detection unit and the first counting unit, and enabling the first counting unit to clear the counting value.
4. The heat generation control circuit according to claim 2, wherein the second signal detection unit includes: the first gating unit, the first voltage detection unit, the first counting unit and the first control unit are connected with the first voltage detection unit;
the second gating unit is electrically connected with the second voltage detection unit and the second receiving unit respectively, and is used for controlling the second receiving unit to output the second voltage signal and outputting the second voltage signal to the second voltage detection unit;
the second voltage detection unit is connected with the second counting unit and is used for comparing the second voltage signal with a second preset voltage threshold and outputting a second comparison result to the second counting unit;
the second counting unit is connected with the signal operation unit and is used for counting according to the second comparison result and outputting a second counting value to the signal operation unit after counting is finished;
the second control unit is respectively connected with the second gating unit, the second voltage detection unit and the second counting unit, and is used for controlling the second gating unit to gate, enabling the second voltage detection unit and the second counting unit, and enabling the second counting unit to clear the counting value.
5. The heat generation control circuit according to claim 3, wherein the first gating unit includes: a first switch, a second switch, and a third switch;
the input end of the first switch is connected with the power supply module, the output end of the first switch is respectively connected with the first receiving unit, the input end of the second switch and the first voltage detection unit, the output end of the second switch is grounded, the input end of the third switch is connected with the first receiving unit, and the output end of the third switch is grounded.
6. The heat generation control circuit according to claim 4, wherein the second gating unit includes: a fourth switch, a fifth switch, and a sixth switch;
the input end of the fifth switch is connected with the power supply module, the output end of the fifth switch is respectively connected with the second receiving unit, the input end of the fifth switch and the second voltage detection unit, the output end of the fifth switch is grounded, the input end of the sixth switch is connected with the second receiving unit, and the output end of the sixth switch is grounded.
7. The heat generation control circuit according to claim 5, wherein the first receiving unit includes: a first capacitor and a second capacitor;
one end of the first capacitor is connected with the output end of the first switch, the input end of the second switch, one end of the second capacitor and the first voltage detection unit respectively, the other end of the first capacitor is grounded, and the other end of the second capacitor is connected with the input end of the third switch.
8. The heat generation control circuit according to claim 6, wherein the second receiving unit includes: the sensor comprises a third capacitor and a fourth capacitor, wherein the fourth capacitor is an equivalent capacitor of the sensor;
one end of the fourth capacitor is connected with the output end of the fourth switch, the input end of the fifth switch, one end of the third capacitor and the second voltage detection unit respectively, the other end of the fourth capacitor is grounded, and the other end of the third capacitor is connected with the input end of the sixth switch.
9. The heating control circuit according to claim 1, wherein the input voltage detection module comprises a first resistor, one end of the first resistor is connected to the main control module, and the other end of the first resistor is connected to a current input end of the heating module.
10. A heat generation control circuit according to claim 9, further comprising a child lock button, wherein an input end of the child lock button is connected to the power module, and an output end of the child lock button is connected to the main control module.
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| CN202221103941.4U CN217279339U (en) | 2022-05-09 | 2022-05-09 | Heating control circuit |
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| CN202221103941.4U CN217279339U (en) | 2022-05-09 | 2022-05-09 | Heating control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115250549A (en) * | 2022-09-22 | 2022-10-28 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115250549A (en) * | 2022-09-22 | 2022-10-28 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
| CN115250549B (en) * | 2022-09-22 | 2022-12-13 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
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