CN115701542A - Heating element resistance value detection device and detection method thereof - Google Patents
Heating element resistance value detection device and detection method thereof Download PDFInfo
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Abstract
The invention relates to a heating element resistance value detection device and a detection method thereof, which are used for accurately controlling the temperature of a heating element with small resistance value change rate, so that better taste and experience can be obtained during smoking; the resistance value detection device of the heating element comprises a first loop and a current amplification circuit; the first loop comprises a power supply control module, a first sampling resistor, a heating element and a switch control module which are sequentially connected in series, and the switch control module is used for controlling the on-off of a circuit where the heating element is located; the power supply control module is used for controlling the output voltage of a power supply for supplying power to the heating element; the first loop is provided with a first sampling point between the output end of the first sampling resistor and the input end of the heating element; and the first sampling point wire is connected with the input end of the current amplifying circuit.
Description
Technical Field
The invention belongs to the field of aerosol generating devices, and particularly relates to a heating element resistance value detection device and a detection method thereof.
Background
The heating principle of the heating element of the electronic cigarette atomizer is that current is converted into heat (formula: P = I × R) through a resistor, and the purpose of heating and atomizing tobacco tar is achieved. In order to measure and control the temperature in a certain designated interval, the resistance value corresponding to the temperature needs to be measured, and then the temperature corresponding to the resistance value is obtained through resistance value conversion or table lookup so as to achieve the purpose of controlling or measuring the temperature. The resistance range of the heating element itself is usually small, generally between 1 to 0.05 ohm, and the measurement accuracy is required to be below 1 milliohm.
There are two traditional methods for detecting the resistance of a heating element in an atomizer in an electronic cigarette: one is to obtain corresponding current and voltage values through a current detection circuit and a corresponding sampling resistor in the loop, and further calculate to obtain the resistance value of the heating element connected into the loop. And the other way is to sample the double-path voltage of the heating part and the sampling resistor of the access line by arranging a bypass, and then obtain the resistance value of the heating part through calculation. However, for the heating element with the resistance value greatly changing with the temperature, the above two resistance value detection schemes are used; for the heating element with resistance value changing less along with temperature, the resistance value in the cigarette lighting process is difficult to be accurately measured due to the influence of factors such as detection error of a detection loop, difference of components and the like in the two resistance value detection schemes. Therefore, in the case of a small change in the resistance of the heat generating member in the atomizer, it is still difficult to perform resistance detection with accuracy within one milliohm in the related art.
Disclosure of Invention
The invention provides a heating element resistance value detection device and a detection method thereof, which are used for accurately controlling the temperature of a heating element with small resistance value change rate, so that better taste and experience can be obtained during smoking.
The basic scheme of the invention is as follows: a resistance value detection device for a heating element comprises a first loop and a current amplification circuit; the first loop comprises a power supply control module, a first sampling resistor, a heating element and a switch control module which are sequentially connected in series, and the switch control module is used for controlling the on-off of a circuit where the heating element is located; the power supply control module is used for controlling the output voltage of a power supply for supplying power to the heating element; the first loop is provided with a first sampling point between the output end of the first sampling resistor and the input end of the heating element; and the first sampling point wire is connected with the input end of the current amplification circuit.
The basic scheme has the beneficial effects that: in the scheme, the potential change of the first sampling point is small due to the fact that the resistance value change of the heating element is small, so that the potential change is amplified by adopting the current amplification circuit and becomes more obvious, and the accuracy of resistance value detection of the heating element is improved. When in actual use, the precision of resistance detection of the heating element can be changed by changing the amplification factor of the current amplification circuit, namely, the higher the amplification factor of the current amplification circuit is, the higher the precision of resistance detection of the heating element is.
Further, the current amplifying circuit is provided with two input ends, one input end is connected with the first sampling point of the first loop, and the other input end is provided with a reference voltage.
Has the advantages that: in this scheme, the voltage output by the output terminal of the current amplification circuit is an amplification multiple of the difference between the input voltages of the two input terminals. Compared with the basic scheme in which the potential of the first sampling point is directly amplified, the scheme amplifies the difference value between the potential of the first sampling point and the potential of the reference voltage, so that the voltage change output by the output end of the current amplification circuit is more obvious, and the resistance value detection precision of the heating element is improved.
Furthermore, the detection device also comprises a second loop, the second loop comprises a power supply control module and a second sampling resistor which are sequentially connected in series, and a second sampling point is arranged in the second loop; the current amplifying circuit is provided with two input ends, one input section is connected with a first sampling point of the first loop, and the other input end is connected with a second sampling point of the second loop.
Has the advantages that: in the scheme, the second sampling point of the second loop provides reference voltage for the other input end of the current amplifying circuit, and a user can change the size of the reference voltage by adjusting the resistance value of the second sampling resistor, so that the heating element is more flexible in detecting the resistance value.
Furthermore, the power supply control module is provided with two output ends, one output end of the power supply control module supplies power to the first loop, and the other output end of the power supply control module supplies power to the second loop.
Has the beneficial effects that: compare and additionally provide a power control module again, this scheme has practiced thrift detection device's whole shared space, has carried out the reasonable simplification of circuit, improves power control module's utilization ratio.
Furthermore, the second loop also comprises a third sampling resistor, one end of the third sampling resistor is connected with the output end of the second sampling resistor, and the other end of the third sampling resistor is grounded; the second sampling point is located between the output end of the second sampling resistor and the input end of the third sampling resistor.
Has the advantages that: the second sampling point is set between the third sampling resistor and the second sampling resistor, so that the anti-interference performance of the second loop is improved, the second loop adopts a circuit wiring diagram similar to the first loop, and the calculation of a potential value output by the second sampling point in the second loop can be avoided when the resistance value of the heating element is calculated; directly calculating the resistance value of the heating element by the resistance values of the first sampling resistor, the second sampling resistor and the third sampling resistor and combining the amplification factor of the current amplifying circuit and the output voltage of the current amplifying circuit. The problem of error appearing when detecting the input voltage of the input end that current amplification circuit and second return circuit link to each other, and then reduce the degree of accuracy that the piece resistance that generates heat calculated is avoided.
Further, the switch control module comprises an MOS tube.
Further, the output end of the current amplification circuit is connected with the input end of the fixed resistor in series, the output end of the fixed resistor is used as a third sampling point, and the third sampling point is used for collecting the output voltage of the current amplification circuit.
Has the advantages that: the fixed resistor is arranged between the detection port and the output end of the current amplification circuit, so that the current amplification circuit is prevented from instantaneously outputting high voltage to break down the output voltage acquisition device, and the time value stability during detection of the third sampling point is facilitated.
Furthermore, the output end of the current amplification circuit is connected with the input end of the anti-interference capacitor, and the output end of the anti-interference capacitor is grounded.
The invention also provides a heating element resistance value detection method, which is realized according to any one heating element resistance value detection device, and comprises the following steps:
acquiring the amplification factor of the current amplification circuit and the resistance value of the first sampling resistor;
detecting the output voltage of the input end of the current amplifying circuit;
and calculating the resistance value of the heating part according to the amplification factor of the current amplification circuit, the resistance value of the first sampling resistor and the output voltage of the input end of the current amplification circuit.
Further, the method comprises:
acquiring output voltage and an amplification factor of a current detection amplification module;
and calculating the resistance value of the heating part according to the resistance values of the first sampling resistor, the second sampling resistor and the third sampling resistor in combination with the output voltage and the amplification coefficient of the current detection amplification module.
Further, according to the resistance values of the first sampling resistor, the second sampling resistor and the third sampling resistor, the output voltage and the amplification coefficient of the current detection amplification module are combined, and the resistance value of the heating element is calculated, specifically:
R X *V DDB /(R X +R 2 )-R 4 *V DDB /(R 3 +R 4 )＝V IOUT_ADCIN /k；
wherein R is X Is the resistance value V of the heating member to be detected DDB Is the voltage value, R, output by the power control module 2 Is the resistance value, R, of the first sampling resistor 3 Is the resistance value, R, of the second sampling resistor 4 K is the resistance of the third sampling resistor, and k is the amplification factor of the current amplifying circuit.
Drawings
Fig. 1 is a schematic block diagram of a resistance detection device for a heat generating element according to a first embodiment;
fig. 2 is a schematic circuit diagram of a resistance detection device for a heat generating element according to a second embodiment;
FIG. 3 is a schematic circuit diagram of a power control module according to a second embodiment;
FIG. 4 is a circuit diagram of a switch control module according to a second embodiment;
fig. 5 is a schematic circuit diagram of a resistance detection device for a heat generating element according to a third embodiment;
fig. 6 is a circuit schematic diagram of a resistance value detection device for a heat generating member according to a fourth embodiment.
Detailed Description
The following is further detailed by way of specific embodiments:
in order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
The first embodiment:
the reference numerals in fig. 1 include: the circuit comprises a power supply control module 101, a first sampling resistor 102, a heating element 103, a current amplification circuit 104, a switch control module 105 and a voltage detection module 106.
The invention provides a heating element resistance value detection device, as shown in fig. 1, comprising a power control module 101, a first sampling resistor 102, a heating element 103, a current amplification circuit 104, a switch control module 105 and a voltage detection module 106. The power control module 101, the first sampling resistor 102, the heating element 103 and the switch control module 105 are sequentially connected in series to form a first loop, and a first sampling point is arranged between the output end of the first sampling resistor 102 and the input end of the heating element 103 in the first loop; the first sampling point wire is connected to an input end of the current amplifying circuit 104, an output end of the current amplifying circuit 104 is connected to an input end of the voltage detecting module 106, another output end of the current amplifying circuit is directly grounded, and the voltage detecting module 106 is used for detecting the voltage output by the output end of the current amplifying circuit 104.
In practical application, this heating element resistance detection device is applied to in detecting the resistance of the heating element, and the heating element can be any kind of device that can generate heat in the heater, the heating net, the heating film etc. of generating heat. The power control module 101 adopts a power supply with controllable output, and the output voltage of the power supply is set to be U General assembly ，U General assembly Is specified by a user or a designer as a known value; the voltage value detected by the voltage detection module 106 of the voltage output by the output terminal of the current amplification circuit 104 is U Measuring U is measured as a test value, the amplification circuit multiple of the current amplification circuit 104 is k, the size of k is self-defined by a user or a related person and is a known value, thatIt can be deduced that the input voltage of the current amplifying circuit 104 connected to the first sampling point is U X ＝U Measuring * k; the resistance value of the first sampling resistor set by the heating element resistance value detection device is R 1 Then the following operation is performed:
potential difference U between two ends of the first sampling resistor R1 ＝U General assembly -U x ；
Current I of heating element to be detected x = current I of first sampling resistor R1 ＝U R1 /R 1 ＝(U General assembly -U x )/R 1 ；
Resistance R of heating element to be detected X ＝U x /I X ＝U X /{(U General assembly -U x )/R 1 }＝R 1 *U X /(U General assembly -U x )；
Therefore, the resistance value of the heating element can be calculated according to the first sampling resistor, the output voltage of the current amplification circuit, the output voltage of the power supply control module and the amplification factor of the current amplification circuit. That is, when this embodiment is implemented, the output voltage of the current amplifying circuit is required.
When the scheme is implemented, the working state of the heating part is controlled by the switch control module 105, and the power supply voltage of the first loop where the heating part is located is controlled by the power supply control module. Since the resistance value change of the heating element is small, the potential change of the first sampling point is small, so that the potential change is amplified by adopting the current amplifying circuit, the detection accuracy of the resistance value of the heating element is improved, and the higher the amplification factor of the current amplifying circuit is, the higher the detection accuracy of the resistance value of the heating element is.
Second embodiment:
the second embodiment relates to a resistance detection device for a heating element, which is a specific example of a module schematic diagram in the first embodiment, and specific details of implementation in the first embodiment are still valid in this embodiment, and are not described herein again.
Fig. 2 shows a circuit diagram of a heating element resistance value detection device according to this embodiment.
In one example, the specific implementation circuit diagram of the power control module, as shown in fig. 3, includes a base power VCC _ BAT, a capacitor C15 with a capacitance of 1 μ f, a voltage regulator chip U3, a high-level output RL _ DET _ EN, a fixed resistor R20 with a known resistance, a switching power VDDA, a capacitor C16 with a capacitance of 1 μ f, a MOS transistor Q2, a low-level output CHRL _ DET _ EN, a fixed resistor R28 with a known resistance, a fixed resistor R29 with a known resistance, and an output power VDDB. The power supply control module is used for providing a controlled power supply VDDB for detecting the resistance value of the heating element, and the basic power supply VCC _ BAT output by the battery is transmitted to VDDA through U3 when the power supply control module is used.
In one example, the circuit diagram of the switch control module, as shown in fig. 4, includes a base power supply VCC _ BAT, a fixed resistor R7 with a known resistance, a fixed resistor R11 with a known resistance, a fixed resistor R12 with a known resistance, a fixed resistor R13 with a known resistance, a MOS transistor U6, a continuous high output VOUT _ EN, an output VOUT1, an output VOUT _ ADCIN, and a fixed capacitor C17. The switch control module is used for controlling the electronic cigarette to normally work,battery-supplied base power source VCC BAT controls the heating element RX connected with the output port VOUT through the switch of MOS tube。
As shown in fig. 2, an output power supply VDDB of the power control module is directly connected to a right end pin of the first sampling resistor R2, a left end pin of the first sampling resistor R2 is connected to an upper end of the heating element RX, a lower end of the heating element RX is grounded, a first sampling point is arranged between the first sampling resistor R2 and the heating element RX, and the first sampling point is directly connected to the amplifying chip U9. The amplifying chip U9 corresponds to the current amplifying circuit IN the first embodiment, the IN + pin of the amplifying chip U9 is connected to the first sampling point, the IN-pin is grounded, the GND pin is grounded, and the VOUT pin is used as an output terminal of the amplifying chip, and the corresponding reference voltage IN the corresponding amplifying chip U9 is 0V.
In one example, the VOUT pin of the amplification chip U9 is directly connected to the voltage detection module, that is, the output voltage of VOUT is directly detected, and the voltage obtained by the test is U U9_VOUT (ii) a Output voltage Ux = k × U at first sampling point U9_VOUT 。
In one example, the output end of the current amplifying circuit is connected with the input end of the anti-interference capacitor, the output end of the anti-interference capacitor is grounded, a third sampling point is arranged between the output end of the current amplifying circuit and the input end of the anti-interference capacitor, the third sampling point is connected with the voltage detection module, and the third sampling point is used for collecting the output voltage of the current amplifying circuit. Specifically, the VOUT pin of the amplification chip U9 is directly connected to one pole of the fixed capacitor C12, the other pole of the fixed capacitor C12 is grounded, and the setting of the fixed capacitor C12 provides anti-interference performance.
In another example, the output end of the current amplifying circuit is connected in series with the input end of the fixed resistor, the output end of the fixed resistor serves as a third sampling point, the third sampling point is connected with the voltage detection module, and the third sampling point is used for collecting the output voltage of the current amplifying circuit. Specifically, as shown in fig. 2, after the VOUT pin of the amplification chip U9 is connected to the fixed resistor R21, the fixed resistor R21 is set to be close to 0, and the measured voltage U is used to measure the voltage U IOUT_ADCIN Calculate U U9_VOUT (ii) a Output voltage Ux = k × U at first sampling point U9_VOUT 。
In one example, the output end of the current amplifying circuit is connected with the input end of an anti-interference capacitor and the input end of a fixed resistor, the anti-interference capacitor is connected with the fixed resistor in parallel, the input end of the fixed resistor serves as a third sampling point, the third sampling point is used for collecting the output voltage of the current amplifying circuit, the third sampling point is connected with a voltage detection module and used for collecting and calculating the output voltage of the current amplifying circuit, and the other electrode, connected with the fixed resistor, of the anti-interference capacitor is grounded. As shown in fig. 2, after the VOUT pin of the amplifier chip is connected to the fixed resistor R21, the fixed resistor R21 is set to be close to 0 according to the measured voltage U IOUT_ADCIN Calculate U U9_VOUT (ii) a Output voltage U of first sampling point X ＝k*U U9_VOUT 。
The second embodiment further provides a method for detecting the resistance of the heating element, which is based on the device for detecting the resistance of the heating element, and the flow chart is as follows:
s1, acquiring an output power supply (namely a control power supply) U controlled by a power supply control module VDDB Obtaining a first sampling resistanceThe resistance value R2 is obtained, and the amplification coefficient k of the amplification chip U9 is obtained;
s2, obtaining or calculating an output voltage U of the VOUT end of U9 U9_VOUT ；
S3, calculating to obtain the resistance RX of the heating element, wherein the process is that the output voltage U of the first sampling point X ＝k*U U9_VOUT ，
R X ＝U x /I X ＝U X /{(U VDDB -U x )/R 1 }＝R 1 *U X /(U VDDB -U x )。
The third embodiment:
a third embodiment of the present invention provides a heating element resistance value detection device, which is different from the second embodiment in that:
as shown in fig. 5, the current amplifying circuit has two input terminals, one of which is connected to the first sampling point of the first loop, and the other of which is provided with a reference voltage. The current amplification circuit adopts an amplification chip U9, an IN + pin of the amplification chip U9 and an IN + pin of the amplification chip U9 are connected with a first sampling point on the first loop, and the first sampling point is positioned between the heating element RX and the first sampling resistor R2; the IN-pin of the amplifying chip U9 is connected with a reference voltage U VIN Reference voltage U VIN Is set by the user or designer, reference voltage U VIN The value of (b) is a known value.
Then at this time U X ＝U VOUT *k+U VIN ，U X Is the potential difference between the two ends of the heating element, U VOUT Is obtained by directly detecting or calculating V of the amplification chip U9 OUT Output voltage of pin, V IN A reference voltage that is an input to the IN-pin, which is a preset value. Further, by R X ＝U x /I X ＝U X /{(U General assembly -U x )/R 1 }＝R 1 *U X /(U General assembly -U x ) Calculate the resistance R of the heating element X 。
IN one example, as shown IN fig. 5, the IN + pin of the amplifying circuit U9 is connected to the first sampling point, the IN-pin is connected to the reference voltage input point VIN, the GND pin is directly connected to ground, and the VOUT pin serves as the output terminal of the amplifying chip.
IN another example, a second sampling resistor is disposed between the IN-pin of the amplifying circuit U9 and the input point of the reference voltage VIN, so as to reduce the possibility that the reference voltage directly breaks down the IN-pin of the amplifying circuit U9.
The third embodiment further provides a method for detecting the resistance of the heating element, wherein the method is based on the device for detecting the resistance of the heating element, and the flow chart is as follows:
s1, acquiring an output power supply (namely a control power supply) U controlled by a power supply control module VDDB Acquiring a resistance value R2 of the first sampling resistor and an amplification coefficient k of an amplification chip U9;
s2, obtaining or calculating an output voltage U of the VOUT end of U9 U9_VOUT Obtaining the reference voltage U of the IN-terminal of U9 VIN ；
S3, calculating to obtain the resistance R of the heating part X The process is that the output voltage U of the first sampling point X ＝k*U U9_VOUT +U VIN ，
R X ＝U x /I X ＝U X /{(U VDDB -U x )/R 1 }＝R 1 *U X /(U VDDB -U x )。
Fourth embodiment:
a fourth embodiment of the present invention provides a heating element resistance value detection device, which is different from the second embodiment in that:
the detection device for the resistance value of the heating element further comprises a second loop, the second loop comprises a power supply control module and a second sampling resistor which are sequentially connected in series, and a second sampling point is arranged in the second loop; the current amplification circuit is provided with two input ends, one input end is connected with the first sampling point of the first loop, and the other input end is connected with the second sampling point of the second loop.
Specifically, as shown in fig. 6, the power control unit provides a controlled power supply VDDB, and the controlled power supply VDDB is respectively connected to the right end of the first sampling resistor R2 and the right end of the second sampling resistor R3; the left end of the first sampling resistor R2 is connected with the upper end of the heating piece RX, the lower end of the heating piece RX is grounded, a first sampling point is arranged between the heating piece RX and the first sampling resistor R2 and is electrically connected with an IN + pin of the amplification chip U9 through the sampling point, and meanwhile, the first sampling point is also connected with the output end of the switch control module, so that the switch control module can control the working state of the heating piece RX. The controlled power supply VDDB, the first sampling resistor R2, the heating element RX and the switch control module form a first loop, and the switch control module can be arranged outside the first loop.
The output end of the controlled power supply VDDB is connected with the right end of the second sampling resistor R3, the left end of the second sampling resistor R3 is connected with the IN-end of the amplifying chip U9, the left end of the second sampling resistor R3 is also connected with the upper end of the third sampling resistor R4, the lower end of the third sampling resistor R4 is connected with the REF end and the GND end of the amplifying chip U9, then the right end of the fixed resistor R25 is connected, and the left end of the fixed resistor R25 is connected with the high level RL _ DET _ EN.
The fourth embodiment further provides a method for detecting the resistance of the heating element, wherein the method is based on the device for detecting the resistance of the heating element, and the flow chart is as follows:
s1, acquiring an output power supply (namely a control power supply) U controlled by a power supply control module VDDB Acquiring a resistance value R2 of the first sampling resistor and an amplification coefficient k of an amplification chip U9;
s2, obtaining or calculating an output voltage U of the VOUT end of U9 U9_VOUT ，；
S3, calculating to obtain the resistance RX of the heating part, wherein the process is as follows X *U VDDB /(R X +R 2 )-R 4 *U VDDB /(R 3 +R 4 )＝U U9_VOUT *k。
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a piece resistance detection device generates heat which characterized in that: the circuit comprises a first loop and a current amplification circuit; the first loop comprises a power supply control module, a first sampling resistor, a heating element and a switch control module which are sequentially connected in series, wherein the switch control module is used for controlling the on-off of a circuit where the heating element is located; the power supply control module is used for controlling the output voltage of a power supply for supplying power to the heating element; the first loop is provided with a first sampling point between the output end of the first sampling resistor and the input end of the heating element; and the first sampling point wire is connected with the input end of the current amplifying circuit.
2. A heating element resistance value detecting device according to claim 1, characterized in that: the current amplification circuit is provided with two input ends, one input end is connected with the first sampling point of the first loop, and the other input end is provided with a reference voltage.
3. A heating element resistance value detecting device according to claim 1, characterized in that: the detection device further comprises a second loop, the second loop comprises a power supply control module and a second sampling resistor which are sequentially connected in series, and a second sampling point is arranged in the second loop; the current amplifying circuit is provided with two input ends, one input section is connected with a first sampling point of the first loop, and the other input end is connected with a second sampling point of the second loop.
4. A heating element resistance value detecting device according to claim 3, characterized in that: the power supply control module is provided with two output ends, one output end of the power supply control module supplies power for the first loop, and the other output end of the power supply control module supplies power for the second loop.
5. A heating element resistance value detecting device according to claim 3, characterized in that: the second loop also comprises a third sampling resistor, one end of the third sampling resistor is connected with the output end of the second sampling resistor, and the other end of the third sampling resistor is grounded; the second sampling point is located between the output end of the second sampling resistor and the input end of the third sampling resistor.
6. A heating member resistance value detecting device according to claim 1, characterized in that: the output end of the current amplification circuit is connected with the input end of the fixed resistor in series, the output end of the fixed resistor serves as a third sampling point, and the third sampling point is used for collecting the output voltage of the current amplification circuit.
7. A heating element resistance value detecting device according to claim 1, characterized in that: the output end of the current amplification circuit is connected with the input end of the anti-interference capacitor, and the output end of the anti-interference capacitor is grounded.
8. A heating member resistance value detection method, which is implemented according to any one of claims 1 to 7, comprising:
acquiring the amplification factor of the current amplification circuit and the resistance value of the first sampling resistor;
detecting the output voltage of the input end of the current amplifying circuit;
and calculating the resistance value of the heating part according to the amplification factor of the current amplification circuit, the resistance value of the first sampling resistor and the output voltage of the input end of the current amplification circuit.
9. A heat generating member resistance value detecting method according to claim 8, which is implemented according to the heat generating member resistance value detecting apparatus according to claim 5, the method comprising:
acquiring output voltage and an amplification factor of a current detection amplification module;
and calculating the resistance value of the heating part according to the resistance values of the first sampling resistor, the second sampling resistor and the third sampling resistor in combination with the output voltage and the amplification coefficient of the current detection amplification module.
10. A heating element resistance value detecting method according to claim 9, characterized in that: according to the resistance values of the first sampling resistor, the second sampling resistor and the third sampling resistor, the resistance value of the heating part is calculated by combining the output voltage and the amplification coefficient of the current detection amplification module, and the calculation method specifically comprises the following steps:
R X *V DDB /(R X +R 2 )-R 4 *V DDB /(R 3 +R 4 )＝V IOUT_ADCIN /k；
wherein R is X Is the resistance value V of the heating member to be detected DDB Is the voltage value, R, output by the power control module 2 Is the resistance value, R, of the first sampling resistor 3 Is the resistance value, R, of the second sampling resistor 4 K is the resistance of the third sampling resistor, and k is the amplification factor of the current amplifying circuit.
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| CN202110879595.2A CN115701542A (en) | 2021-08-02 | 2021-08-02 | Heating element resistance value detection device and detection method thereof |
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| CN202110879595.2A CN115701542A (en) | 2021-08-02 | 2021-08-02 | Heating element resistance value detection device and detection method thereof |
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