CN115191672A - Load control circuit, method and device and atomization device - Google Patents
Load control circuit, method and device and atomization device Download PDFInfo
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- CN115191672A CN115191672A CN202110451933.2A CN202110451933A CN115191672A CN 115191672 A CN115191672 A CN 115191672A CN 202110451933 A CN202110451933 A CN 202110451933A CN 115191672 A CN115191672 A CN 115191672A
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/50—Control or monitoring
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
- A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
- A24F40/46—Shape or structure of electric heating means
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Abstract
The application provides a load control circuit, a method, a device and an atomization device, wherein the circuit comprises: a pulse width modulation signal generation circuit; a switching circuit electrically connected to the pulse width modulation signal generating circuit and a reference circuit for generating a reference current, respectively; the enabling circuit is electrically connected between the pulse width modulation signal generating circuit and the switching circuit; a load electrically connected to the switching circuit, a resistance value of which is determined based on the reference current; and the regulation and control unit is electrically connected with the pulse width modulation signal generation circuit and is used for analyzing and processing the resistance value of the load and sending a duty ratio control signal to the pulse width modulation signal generation circuit according to the analysis and processing result, and the pulse width modulation signal generation circuit regulates the duty ratio of the pulse width modulation signal according to the duty ratio control signal. The application has been solved current atomizing device and has actually produced the problem that there is the difference or smog volume production volume unstability with system's set value.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a load control circuit, a method, a device, and an atomization device.
Background
The atomization device generally comprises a liquid storage assembly, an atomization assembly and a battery assembly. The prior atomization device has the following problems in application: 1. the temperature of the atomizing assembly changes along with the use of the atomizing device, so that the heating efficiency of the atomizing assembly is unequal; 2. the energy of the battery is slowly reduced along with the use of the atomization device, and the voltage of the battery is continuously reduced in the process; the resistance value of the atomization component is uncertain or changes along with the temperature, so that the output power of a circuit in the atomization device cannot reach a constant value, and the output power of the atomization device is unstable. These problems can cause the difference between the amount of smoke actually generated by the atomizing device and the set value of the system or the unstable amount of smoke, thereby causing the symptoms of poor user experience, even vomiting and nausea.
Disclosure of Invention
The embodiment of the application provides a load control circuit, a load control method, a load control device and an atomization device, and solves the problem that the actually generated smoke quantity of the existing atomization device is different from a set value of a system or the smoke quantity is unstable.
In a first aspect, a load control circuit is provided, including: a pulse width modulation signal generation circuit;
the switching circuit is respectively and electrically connected with the pulse width modulation signal generating circuit and a reference circuit, and the reference circuit is used for generating reference current;
the enabling circuit is electrically connected between the pulse width modulation signal generating circuit and the switch circuit and used for generating an enabling signal based on a pulse width modulation signal and sending the enabling signal to the switch circuit so as to enable the switch circuit to select the pulse width modulation signal when the pulse width modulation signal is at a first level and select an output signal of the reference circuit as an input signal when the pulse width modulation signal is at a second level;
a load electrically connected to the switching circuit, a resistance value of the load being determined based on the reference current;
and the regulation and control unit is electrically connected with the pulse width modulation signal generation circuit and is used for analyzing and processing the resistance value of the load and sending a duty ratio control signal to the pulse width modulation signal generation circuit according to the analysis and processing result, and the pulse width modulation signal generation circuit adjusts the duty ratio of the pulse width modulation signal according to the duty ratio control signal.
According to the load control circuit provided by the embodiment of the application, the enabling circuit sends the enabling signal to the switching circuit according to the level of the pulse width modulation signal generated by the pulse width modulation signal generating circuit, the switching circuit can select the pulse width modulation signal or the output signal of the reference circuit as the input signal according to the level of the enabling signal, when the switching circuit selects the output signal of the reference circuit as the input signal, the current flowing through the load is the reference current at the moment, the resistance value of the load is calculated according to the current and the voltage of the load, the regulating and controlling unit further analyzes and processes the resistance value of the load, the duty ratio control signal is obtained according to the analysis and processing result and sent to the pulse width modulation signal generating circuit to adjust the duty ratio of the pulse width modulation signal, so that the temperature of the load is constant or the power of the load is constant, and further the actual generated smoke amount of the atomizing device and a set value of the system become small or the difference between the smoke amount is more stable.
In one possible design, the regulation unit includes a first voltage detection circuit, a power calculation module, and a first duty cycle control circuit;
the first voltage detection circuit is electrically connected to two ends of the load and is used for detecting a first voltage difference value between two ends of the load when an output signal of the reference circuit is used as an input signal; detecting a second voltage difference across the load when the pulse width modulated signal is an input signal;
the power calculation module is electrically connected with the first voltage detection circuit and is used for acquiring a first voltage difference value and a second voltage difference value of two ends of the load; the power calculation module stores the reference current value and a preset power value;
the power calculation module is used for calculating the resistance value of the load according to the first voltage difference value of the two ends of the load and the reference current value, calculating the power of the load according to the resistance value of the load and the second voltage difference value of the two ends of the load, and calculating a first difference value between the power value of the load and a preset power value as a first analysis processing result;
the first duty ratio control circuit is respectively electrically connected with the power calculation module and the pulse width modulation signal generation circuit, and is used for generating a duty ratio control signal according to the first analysis processing result and sending the duty ratio control signal to the pulse width modulation signal generation circuit, and the pulse width modulation signal generation circuit adjusts the duty ratio of the pulse width modulation signal according to the duty ratio control signal.
In one possible design, the regulation and control unit comprises a second voltage detection circuit, a resistance value calculation module and a second duty ratio control circuit;
the second voltage detection circuit is electrically connected to two ends of the load and used for detecting the voltage difference value of the two ends of the load;
the resistance value calculation module is electrically connected with the second voltage detection circuit and is used for acquiring a voltage difference value between two ends of the load; the resistance value calculation module stores the reference current value and a preset resistance value;
the resistance value calculation module is used for calculating the resistance value of the load according to the voltage difference value of the two ends of the load and the reference current value, and calculating a second difference value between the resistance value of the load and the preset resistance value as a second analysis processing result;
the second duty ratio control circuit is respectively electrically connected with the resistance value calculation module and the pulse width modulation signal generation circuit, and is used for generating a duty ratio control signal according to the second analysis processing result and sending the duty ratio control signal to the pulse width modulation signal generation circuit, and the pulse width modulation signal generation circuit adjusts the duty ratio of the pulse width modulation signal according to the duty ratio control signal.
In one possible design, the reference current value generated by the reference circuit is a constant value.
In one possible design, the switching circuit includes a selection circuit and a field effect transistor;
the grid electrode of the field effect transistor is connected with the selection circuit, and the drain electrode of the field effect transistor is connected with one end of the load;
the source electrode of the field effect transistor is grounded, the other end of the load is connected with the battery or the source electrode of the field effect transistor is connected with the battery, and the other end of the load is grounded.
In one possible design, the load is a thermistor.
In a second aspect, a control method of a load control circuit is provided, where the load control circuit is the above load control circuit, and the control method includes:
the switching circuit inputs a reference current to the load;
a first voltage detection circuit detects a first voltage across the load;
the power calculation module calculates the resistance value of the load according to the reference current value and the first voltage value;
the switching circuit inputs a pulse width modulation signal to the load;
the power calculation module calculates a power value of the load;
the power calculation module calculates a first difference value between the power value of the load and a preset power value;
when the absolute value of the first difference is greater than zero, the first duty cycle control circuit adjusts the duty cycle of the input pulse width modulation signal to the load.
In a third aspect, a control method is provided, which is applied to the load control circuit described above, and includes:
the switching circuit inputs a reference current to the load;
a second voltage detection circuit detects a second voltage across the load;
the resistance value calculation module calculates the resistance value of the load according to the reference current value and the second voltage value;
the resistance value calculation module calculates a second difference value between the resistance value of the load and a preset resistance value;
when the absolute value of the second difference is greater than zero, the second duty cycle control circuit adjusts the duty cycle of the input pulse width modulation signal to the load.
In a fourth aspect, a load control device is provided, comprising a load control circuit as described above.
In a fifth aspect, there is provided an atomization device comprising a load control circuit as described above and a load control device as described above.
The invention has the following beneficial effects: in a period of the pulse width modulation signal, when the pulse width modulation signal is at a low level or a high level, reference current flows to the load, voltage of the load is detected, the current resistance value of the load is calculated according to the voltage value and the reference current value, when the pulse width modulation signal is at a high level or a low level, the pulse width modulation signal is input to the load, the load generates heat to generate smoke, the resistance value of the load is further analyzed and processed, the duty ratio of the pulse width modulation signal is adjusted according to the analysis and processing result to enable the temperature of the load to be constant or the power of the load to be constant, and then the difference between the actually generated smoke and a set value of a system is reduced or the smoke quantity is more stable. In practical application, the load control circuit can be applied to the atomization device, so that the actual generated smoke quantity of the atomization device is consistent with a set value of a system, and the smoke quantity output is more stable.
Drawings
Fig. 1 is a schematic structural diagram of a load control circuit according to an embodiment of the present disclosure.
FIG. 2 is a schematic diagram of a structure of the regulatory unit of FIG. 1.
Fig. 3 is a schematic structural diagram of the N-type field effect transistor in fig. 2.
Fig. 4 is a schematic structural diagram of the P-type fet in fig. 2.
FIG. 5 is a schematic diagram of another structure of the regulatory unit of FIG. 1.
Fig. 6 is a schematic structural view of the N-type fet shown in fig. 5.
Fig. 7 is a schematic structural view of the P-type fet shown in fig. 5.
Fig. 8 is a graph of the resistance of the load of fig. 5 as a function of temperature.
Fig. 9 is a flowchart illustrating a control method of a load control circuit according to an embodiment of the present application.
Fig. 10 is a schematic flowchart of a control method provided in an embodiment of the present application.
Reference numerals: 10. a pulse width modulation signal generation circuit; 20. a switching circuit; 30. a reference circuit; 40. an enable circuit; 50. a load; 60. a first voltage detection circuit; 70. a power calculation module; 80. a first duty cycle control circuit; 21. a selection circuit; 61. a second voltage detection circuit; 71. a resistance value calculation module; 81. a second duty cycle control circuit.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; may be mechanically, electrically or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the same reference numerals are used to denote the same components or parts in the embodiments of the present application, and for the same parts in the embodiments of the present application, only one of the parts or parts may be given the reference numeral, and it should be understood that the reference numerals are also applicable to the other same parts or parts.
The embodiment of the application provides a load control circuit, a method, a device and an atomization device, and solves the problem that the actually generated smoke quantity of the existing atomization device is different from a set value of a system or the smoke quantity is unstable.
As shown in fig. 1, the load control circuit provided in the embodiment of the present application includes a pulse width modulation signal generating circuit 10, a switching circuit 20, an enabling circuit 40, a load 50, and a regulating unit; the switch circuit 20 is electrically connected to the pwm signal generating circuit 10 and a reference circuit 30, respectively, the reference circuit 30 is used for generating a reference current; the enable circuit 40 is electrically connected between the pwm signal generating circuit 10 and the switch circuit 20, and is configured to generate an enable signal based on the pwm signal and send the enable signal to the switch circuit 20, so that the switch circuit 20 selects the pwm signal when the pwm signal is at a first level and selects an output signal of the reference circuit 30 as an input signal when the pwm signal is at a second level; a load 50 is electrically connected to the switching circuit 20, and a resistance value of the load 50 is determined based on the reference current; the regulating and controlling unit is electrically connected to the pwm signal generating circuit 10, and is configured to analyze the resistance of the load 50, and send a duty ratio control signal to the pwm signal generating circuit 10 according to the analysis result, and the pwm signal generating circuit 10 adjusts the duty ratio of the pwm signal according to the duty ratio control signal.
According to the load control circuit provided in the embodiment of the present application, the enabling circuit 40 sends an enabling signal to the switching circuit 20 according to the level of the pwm signal generated by the pwm signal generating circuit 10, the switching circuit selects the pwm signal or the output signal of the reference circuit as the input signal according to the level of the enabling signal, when the switching circuit 20 selects the output signal of the reference circuit 30 as the input signal, the current flowing through the load 50 is the reference current, the resistance of the load 50 is calculated according to the current and the voltage of the load 50, the regulating and controlling unit further analyzes and processes the resistance of the load 50, obtains a duty ratio control signal according to the analysis and processes result, and sends the duty ratio control signal to the pwm signal generating circuit 10 to adjust the duty ratio of the pwm signal, so that the temperature of the load is constant or the power of the load is constant, and the difference between the amount of actually generated smoke and the set value of the atomizing device is smaller or the amount of actually generated smoke is more stable.
Alternatively, the reference current value generated by reference circuit 30 is a constant value.
In the above arrangement, the reference current is not affected by the variation of the power supply voltage and is not affected by the environmental factors such as temperature, so that the current is kept constant when the resistance value of the load 50 is calculated, and the accurate resistance value of the load 50 can be calculated by detecting the voltage of the load 50.
On the basis of the above-described embodiments, in one embodiment of the present application, as shown in fig. 3 to 4 and 6 to 7, the switching circuit 20 includes a selection circuit 21 and a field effect transistor; the grid of the field effect transistor is connected with the selection circuit 21, and the drain is connected with one end of the load 50; the source of the field effect transistor is grounded, the other end of the load 50 is connected to the battery or the source of the field effect transistor is connected to the battery, and the other end of the load 50 is grounded.
In the above configuration, the field effect transistor is a metal (metal) -oxide-semiconductor (semiconductor) field effect transistor, and may be an N-type metal (metal) -oxide-semiconductor (semiconductor) field effect transistor, which is abbreviated as an NMOS transistor in the following description, or may be a P-type metal (metal) -oxide-semiconductor (semiconductor) field effect transistor, which is abbreviated as a PMOS transistor in the following description.
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 2, the regulation and control unit includes a first voltage detection circuit 60, a power calculation module 70, and a first duty ratio control circuit 80; a first voltage detection circuit 60 electrically connected to both ends of the load 50 for detecting a first voltage difference across the load 50 when an output signal of the reference circuit 30 is an input signal, and detecting a second voltage difference across the load 50 when a pulse width modulation signal is an input signal; the power calculating module 70 is electrically connected to the first voltage detecting circuit 60, and is configured to obtain a first voltage difference value and a second voltage difference value at two ends of the load 50; the power calculation module 70 stores a reference current value and a preset power value; the power calculating module 70 is configured to calculate a resistance value of the load 50 according to a first voltage difference value across the load 50 and a reference current value, calculate a power of the load 50 according to the resistance value of the load 50 and a second voltage difference value across the load 50, and calculate a first difference value between a power value of the load 50 and a preset power value as a first analysis processing result; the first duty ratio control circuit 80 is electrically connected to the power calculation module 70 and the pwm signal generation circuit 10, and configured to generate a duty ratio control signal according to the first analysis processing result and send the duty ratio control signal to the pwm signal generation circuit 10, and the pwm signal generation circuit 10 adjusts the duty ratio of the pwm signal according to the duty ratio control signal.
In the above embodiment, when the pwm signal and the output signal of the reference circuit 30 are respectively used as input signals, the current in the loop composed of the power supply, the load and the fet is different in magnitude, and the voltage drops of the fet are also different, in this embodiment, accurate real-time voltages are obtained by measuring real-time voltages at two ends of the load for different input signals, so that the power control accuracy is improved.
Through the setting, the resistance of the load is calculated firstly, then the power of the load is calculated according to the resistance of the load, so that the circuit can be simplified, the low level time interval of each period of the pulse width modulation signal is fully utilized, the real-time resistance of the load is accurately calculated, further, the accurate power of the load can be obtained in the high level time interval of the pulse width modulation signal, the normal work of the load cannot be influenced in the measuring process, a more appropriate duty ratio control signal can be obtained according to the difference value of the power value of the load and the preset power value, the adjusted load power value is equal to the preset power value, and the constancy is achieved.
In one possible embodiment, as shown in fig. 3, the field effect transistor is an NMOS transistor, the selection circuit 21 is controlled by the signal of the enable circuit 40, the voltage signal applied to the gate of the NMOS transistor is a pwm signal, the first level is a high level, the second level is a low level, the signal of the enable circuit 40 is a low level when the pwm signal is a low level, the whole circuit is in the first working period t1, which is a period for detecting the resistance of the load 50, the signal applied to the gate of the NMOS transistor is an output signal from the reference circuit 30, and when the gate of the NMOS transistor is connected to the output signal of the reference circuit 30, the current flowing through the NMOS transistor is set as the reference current I ref It should be noted that the reference voltage is a voltage value that does not change with the supply voltage and does not change with the environmental factors such as temperature, and is applied to the gate of the NMOS transistor, and because the source of the NMOS transistor is grounded, that is, a constant voltage value is applied to both ends of the gate of the NMOS transistor to ensure the reference current I flowing through the NMOS transistor ref Without change, the reference current I ref The reference current I is kept at a constant value without changing with the voltage of the battery or being influenced by factors such as external temperature ref Through the load 50. The load 50 is a two-port component, one end of the load is marked as AT connected with the drain electrode of the NMOS tube, the other end of the load is marked as PVDD connected with the positive end of the battery, so that the load and the highest voltage which can be output by the battery are kept the same, and the highest voltage which can be output by the battery is marked as V BAT ，V BAT The voltage value is a variable that decreases as the battery power is consumed and that increases as the battery is charged. The PVDD port and the AT port are respectively connected with a first voltage detection circuit 60, and the voltage of the AT port is recorded as V AT Is transmitted to a power calculation module, and then the voltage difference V between both ends of the load 50 is calculated load ＝V PVDD -V AT By the formula R load ＝V load /I ref To obtain the resistance R of the load 50 load 。
When the pwm modulation signal is high, the signal of the enable circuit 40 is high, the whole circuit is in the second working period t2, which is also the period of detecting the power of the load 50, and the voltage difference V applied across the load 50 is detected load Negative can be calculated according to the formulaPower P consumed by 50 load load ＝V 2 load /R load . Setting the power preset by the system as P, when P load >P times means that the effective value of the voltage across the load 50 is too large, when P is load <When P is times, the effective value of the voltage applied to the two ends of the load 50 is too small, the power calculation module transmits a signal for adjusting the effective value of the voltage of the two ends of the load 50 to the first duty ratio control circuit 80, and the first duty ratio control circuit 80 transmits the signal to the first duty ratio control circuit 80 according to P load And P is different from P, the newly obtained power P consumed by the load 50 is obtained by transmitting a suitable signal to the pwm signal generating circuit 10 to output a suitable duty ratio D newload ＝(D*V load ) 2 /R load Let P stand newload (= P), wherein P newload To the power applied to the load 50 at the new pwm duty cycle. This ensures that the power at the load 50 is always constant at P.
In another possible embodiment, as shown in fig. 4, the fet is a PMOS transistor, the selection circuit 21 is controlled by the signal of the enable circuit 40, the voltage signal applied to the gate of the PMOS transistor is a pwm signal, the first level is low, the second level is high, the enable signal is high when the pwm signal is high, the whole circuit is in the first working period t1, which is a period for detecting the resistance of the load 50, the selection circuit 21 selects the output signal of the reference circuit as the input signal, and the current flowing through the PMOS transistor is set as the reference current I ref The reference current I ref The reference current I is kept at a constant value without changing with the voltage of the battery or being influenced by factors such as external temperature ref Through the load 50; the load 50 is a two-port device, wherein one end is marked as AT connected to the drain of the PMOS tube, and the other end is marked as GND ground. Both ends of the load 50 are connected to a first voltage detecting circuit 60, and the voltage AT the terminal detected by the first voltage detecting circuit 60 is denoted as V AT And the voltage at the GND terminal is detected as V GND The two values are transmitted to a power calculation module through a formula V load ＝V AT -V GND Calculate the voltage difference across the load 50, whichMiddle V load The power calculation module calculates the voltage difference across the load 50 by calculating the equation R load ＝V load /I ref To obtain the resistance R of the load 50 load 。
When the pwm modulation signal is low, the signal of the enable circuit 40 is low, and the whole circuit is in the second operation period t2, which is also a period of detecting the power of the load 50, and the voltage difference V across the load 50 is detected load The power P consumed by the load 50 can be calculated according to the formula load ＝V 2 load /R load . Setting the power preset by the system as P, when P load >P x time means that the effective value of the voltage applied across the load 50 is too large, when P is load <When P × time means that the effective value of the voltage applied to the two ends of the load 50 is too small, the power calculation module transmits a signal for adjusting the effective value of the voltage of the two ends of the load 50 to the first duty cycle control circuit 80, and the first duty cycle control circuit 80 transmits the signal to the first duty cycle control circuit 80 according to P load The difference P is different, and a suitable signal is transmitted to the pwm signal generating circuit 10 to output a suitable duty ratio D, so that the newly obtained power P consumed by the load 50 newload ＝(D*V load ) 2 /R load Let P stand newload (= P), wherein P newload To the power applied to the load 50 at the new pwm duty cycle. This ensures that the power at the load 50 is always constant at P.
In other embodiments, the formula for obtaining the resistance of the load 50 may vary due to the variation of the positions of the circuit components, but the total constant power output mode is obtained by the following formula, where R = V/I reference current is given as P = V/I 2 Effective value and/R, where V is an absolute value of a voltage difference across the load 50, and the effective value of V is an effective value of voltages across the load 50 used in calculating power consumption.
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 5, the regulating and controlling unit includes a second voltage detecting circuit 61, a resistance value calculating module 71, and a second duty ratio control circuit 81; the second voltage detection circuit 61 is electrically connected to both ends of the load 50, and is configured to detect a voltage difference between both ends of the load 50; the resistance value calculating module 71 is electrically connected to the second voltage detecting circuit 61, and is configured to obtain a voltage difference between two ends of the load 50; the resistance value calculation module 71 stores a reference current value and a preset resistance value; the resistance value calculation module 71 is configured to calculate a resistance value of the load 50 according to the voltage difference value and the reference current value at the two ends of the load 50, and calculate a second difference value between the resistance value of the load 50 and a preset resistance value as a second analysis processing result; the second duty ratio control circuit 81 is electrically connected to the resistance value calculating module 71 and the pwm signal generating circuit 10, and is configured to generate a duty ratio control signal according to the second analysis processing result and send the duty ratio control signal to the pwm signal generating circuit 10, and the pwm signal generating circuit 10 adjusts the duty ratio of the pwm signal according to the duty ratio control signal.
In the above arrangement, the load 50 is a thermistor. Through the arrangement, the resistance value of the load can change along with the change of the temperature, and the specific change relation graph of the resistance value of the load and the temperature is shown in fig. 8.
In one possible embodiment, as shown in fig. 6, the fet is an NMOS transistor, the selection circuit 21 is controlled by the signal of the enable circuit 40, the voltage signal applied to the gate of the NMOS transistor is a pwm signal, the first level is a high level, the second level is a low level, when the pwm signal is high, the signal of the enable circuit 40 is high, and the whole circuit is in the first working period t1, which is also a period when the load 50 generates heat; when the pwm modulation signal is low, the signal of the enable circuit 40 is low, the whole circuit is in the second working period t2, which is the period of detecting the resistance of the load 50, the signal applied to the gate of the NMOS transistor is the output signal from the reference circuit 30, and when the gate of the NMOS transistor is connected to the output signal of the reference circuit 30, the current flowing through the NMOS transistor is set as the reference current I ref It should be noted that the reference voltage is not dependent on the currentThe voltage value of which the source voltage changes and does not change along with environmental factors such as temperature and the like is added on the grid electrode of the NMOS tube, and because the source electrode of the NMOS tube is grounded, namely, the constant voltage value is added on the two ends of the grid electrode of the NMOS tube to ensure the reference current I flowing through the NMOS tube ref Constant, the reference current I ref The reference current I is kept at a constant value without changing with the voltage of the battery or being influenced by factors such as external temperature ref Through the load 50. The load 50 is a two-port component, one end of which is marked as AT connected with the drain electrode of the NMOS tube, the other end of which is marked as PVDD connected with the positive end of the battery, so that the highest voltage which can be output by the battery is kept the same as the highest voltage which can be output by the battery, and the highest voltage which can be output by the battery is marked as V BAT ，V BAT The voltage value is a variable that decreases as the battery power is consumed and that increases as the battery is charged. The PVDD port and the AT port are respectively connected with a second voltage detection circuit 61, and the voltage of the AT port is recorded as V AT Is sent to a resistance value calculating module 71, and then the voltage difference V between the two ends of the load 50 is calculated load ＝V PVDD -V AT By the formula R load ＝V load /I ref To obtain the resistance R of the load 50 load 。
Let the system preset resistance value be R, when R load >When R, it means the load resistance is too large, since the load resistance varies with the temperature, it also indicates that the current system temperature is too large, when R load <When R, it also indicates that the current system temperature is too low, and the system temperature changes because the whole circuit is in the first working period t1, which is also caused by the change of the heating period of the load 50, the resistance value calculating module transmits the signal that needs to adjust the resistance value of the load, that is, the signal that adjusts the effective value of the voltages at the two ends of the load 50 to the second duty ratio control circuit 81, and the second duty ratio control circuit 81 adjusts the effective value of the voltages at the two ends of the load according to R load And the difference value of R is different, a proper signal is transmitted to the pulse width modulation signal generating circuit 10 to enable the pulse width modulation signal generating circuit to output a proper duty ratio D, so that the duration of the first working period t1 is changed, the system temperature is changed, and the temperature is always kept at a constant temperature.
In another possible embodiment, as shown in FIG. 7, the fieldThe effect transistor is a PMOS transistor, the selection circuit 21 is controlled by a signal of the enable circuit 40, a voltage signal applied to a gate of the PMOS transistor is a pwm modulation signal, at this time, the first level is a low level, the second level is a high level, when the pwm modulation signal is low, the signal of the enable circuit 40 is low, and the whole circuit is in a first working period t1, which is also a period when the load 50 heats; when the pwm modulation signal is high, the enable signal is high, the whole circuit is in the second working period t2, which is the period for detecting the resistance of the load 50, the selection circuit 21 selects the output signal of the reference circuit as the input signal, and the current flowing through the PMOS transistor is set as the reference current I ref The reference current I ref The reference current I is kept at a constant value without changing with the voltage of the battery or being influenced by factors such as external temperature ref Flows through the load 50; the load 50 is a two-port device, wherein one end is marked as AT connected to the drain of the PMOS tube, and the other end is marked as GND ground. Both ends of the load 50 are connected to a second voltage detection circuit 61, and the voltage AT the AT terminal detected by the second voltage detection circuit 61 is denoted as V AT And the voltage of the GND terminal is detected as V GND The two values are passed to a power calculation module, via equation V load ＝V AT -V GND Calculate the voltage difference across load 50, where V load The resistance calculation module calculates the voltage difference across the load 50 by calculating the equation R load ＝V load /I ref To obtain the resistance R of the load 50 load 。
Setting the preset resistance value of the system as R load >R indicates the load resistance is too large, since the load resistance varies with temperature, it also indicates that the current system temperature is too large, when R load <When R, it also indicates that the current system temperature is too low, and the system temperature changes because the whole circuit is in the first working period t1, which is also caused by the change of the heating period of the load 50, the resistance value calculating module transmits the signal that needs to adjust the resistance value of the load, that is, the signal that adjusts the effective value of the voltages at the two ends of the load 50 to the second duty ratio control circuit 81, and the second duty ratio control circuit 81 adjusts the effective value of the voltages at the two ends of the load according to R load And the magnitude of the difference RDifferent, the proper signal is transmitted to the pwm signal generating circuit 10 to output a proper duty ratio D, so that the duration of the first working period t1 changes, the temperature of the system changes, and the temperature is always kept constant.
As shown in fig. 9, a control method of a load control circuit provided in an embodiment of the present application includes the following steps:
step S401, a switching circuit inputs reference current to a load;
step S402, a first voltage detection circuit detects a first voltage at two ends of a load;
step S403, the power calculation module calculates the resistance value of the load according to the reference current value and the first voltage value;
step S404, the switch circuit inputs a pulse width modulation signal to a load;
step S405, a power calculation module calculates a power value of a load;
step S406, the power calculation module calculates a first difference value between the power value of the load and a preset power value;
step S407, when the absolute value of the first difference is greater than zero, the first duty ratio control circuit adjusts the duty ratio of the input pulse width modulation signal to the load.
According to the control method of the load control circuit provided by the embodiment of the application, the output power of the load can be controlled to be always kept the same as the preset power value. The specific way of calculating the power value of the load in step S405 may be to first detect the voltages at two ends of the load through a first voltage detection circuit; and the power calculation module calculates the power value of the load according to the resistance value and the voltage value of the load.
As shown in fig. 10, the control method provided in the embodiment of the present application includes the following steps:
step S501, a switching circuit inputs reference current to a load;
step S502, a second voltage detection circuit detects second voltages at two ends of a load;
step S503, the resistance value calculation module calculates the resistance value of the load according to the reference current value and the second voltage value;
step S504, a resistance value calculation module calculates a second difference value between the resistance value of the load and a preset resistance value;
and step S505, when the absolute value of the second difference is larger than zero, the second duty ratio control circuit adjusts the duty ratio of the pulse width modulation signal input to the load.
According to the control method provided by the embodiment of the application, the load resistance value can be controlled to be always the same as the preset resistance value, namely, the system temperature is always kept constant.
The load control device provided by the embodiment of the application comprises the load control circuit.
The atomization device provided by the embodiment of the application comprises the load control circuit and the load control device.
In practical application, the load in the atomizing device of the embodiment of the application is the heating element, and by adopting the load control circuit, the circuit complexity is reduced, the power loss is reduced, the service life of a battery in the atomizing device is prolonged, the output power of the heating element of the atomizing device can be kept unchanged all the time or the system temperature caused by heating of the heating element is kept unchanged, so that the actual generated smoke amount of the atomizing device is consistent with the set value of the system, the smoke amount output is more stable, and the user experience feeling can be improved.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A load control circuit, comprising:
a pulse width modulation signal generation circuit (10);
the switching circuit (20), the said switching circuit (20) connects the said pulse width modulation signal generation circuit (10) and a reference circuit (30) electrically separately, the said reference circuit (30) is used for producing the reference current;
an enable circuit (40), electrically connected between the pulse width modulation signal generation circuit (10) and the switch circuit (20), for generating an enable signal based on a pulse width modulation signal and sending the enable signal to the switch circuit (20), so that the switch circuit (20) selects the pulse width modulation signal when the pulse width modulation signal is at a first level, and selects an output signal of the reference circuit (30) as an input signal when the pulse width modulation signal is at a second level;
a load (50), the load (50) being electrically connected to the switching circuit (20), a resistance value of the load (50) being determined based on the reference current;
the regulating and controlling unit is electrically connected with the pulse width modulation signal generating circuit (10), and is used for analyzing and processing the resistance value of the load (50), sending a duty ratio control signal to the pulse width modulation signal generating circuit (10) according to the analysis and processing result, and adjusting the duty ratio of the pulse width modulation signal by the pulse width modulation signal generating circuit (10) according to the duty ratio control signal.
2. The load control circuit according to claim 1, wherein the regulation unit comprises a first voltage detection circuit (60), a power calculation module (70) and a first duty cycle control circuit (80);
the first voltage detection circuit (60) is electrically connected to two ends of the load (50) and is used for detecting a first voltage difference value between two ends of the load (50) when an output signal of the reference circuit (30) is used as an input signal, and detecting a second voltage difference value between two ends of the load (50) when the pulse width modulation signal is used as an input signal;
the power calculation module (70) is electrically connected with the first voltage detection circuit (60) and is used for acquiring a first voltage difference value and a second voltage difference value of two ends of the load (50); the power calculation module (70) stores the reference current value and a preset power value;
the power calculation module (70) is used for calculating the resistance value of the load (50) according to a first voltage difference value at two ends of the load (50) and the reference current value, calculating the power of the load (50) according to the resistance value of the load (50) and a second voltage difference value at two ends of the load (50), and calculating a first difference value between the power value of the load (50) and a preset power value as a first analysis processing result;
the first duty ratio control circuit (80) is respectively electrically connected with the power calculation module (70) and the pulse width modulation signal generation circuit (10) and is used for generating a duty ratio control signal according to the first analysis processing result and sending the duty ratio control signal to the pulse width modulation signal generation circuit (10), and the pulse width modulation signal generation circuit (10) adjusts the duty ratio of the pulse width modulation signal according to the duty ratio control signal.
3. The load control circuit according to claim 1, wherein the regulation and control unit comprises a second voltage detection circuit (61), a resistance value calculation module (71) and a second duty cycle control circuit (81);
the second voltage detection circuit (61) is electrically connected to two ends of the load (50) and is used for detecting a voltage difference value between the two ends of the load (50);
the resistance value calculation module (71) is electrically connected with the second voltage detection circuit (61) and is used for acquiring a voltage difference value between two ends of the load (50); the resistance value calculation module (71) stores the reference current value and a preset resistance value;
the resistance value calculating module (71) is used for calculating the resistance value of the load (50) according to the voltage difference value at the two ends of the load (50) and the reference current value, and calculating a second difference value between the resistance value of the load (50) and the preset resistance value as a second analysis processing result;
the second duty ratio control circuit (81) is electrically connected with the resistance value calculation module (71) and the pulse width modulation signal generation circuit (10) respectively, and is used for generating a duty ratio control signal according to the second analysis processing result and sending the duty ratio control signal to the pulse width modulation signal generation circuit (10), and the pulse width modulation signal generation circuit (10) adjusts the duty ratio of the pulse width modulation signal according to the duty ratio control signal.
4. Load control circuit according to any of claims 1-3, characterized in that the reference current value generated by the reference circuit (30) is a constant value.
5. Load control circuit according to any of claims 1-3, characterized in that the switching circuit (20) comprises a selection circuit (21) and a field effect transistor;
the grid electrode of the field effect transistor is connected with the selection circuit (21), and the drain electrode of the field effect transistor is connected with one end of the load (50);
the source electrode of the field effect transistor is grounded, the other end of the load (50) is connected with the battery or the source electrode of the field effect transistor is connected with the battery, and the other end of the load (50) is grounded.
6. The load control circuit according to claim 3, wherein the load (50) is a thermistor.
7. A control method of a load control circuit, wherein the load control circuit is the load control circuit of claim 2, the control method comprising:
the switching circuit inputs reference current to the load;
a first voltage detection circuit detects a first voltage across the load;
the power calculation module calculates the resistance value of the load according to the reference current value and the first voltage value;
the switch circuit inputs a pulse width modulation signal to the load;
the power calculation module calculates a power value of the load;
the power calculation module calculates a first difference value between the power value of the load and a preset power value;
when the absolute value of the first difference is greater than zero, the first duty cycle control circuit adjusts the duty cycle of the input pulse width modulation signal to the load.
8. A control method applied to the load control circuit of claim 3, the control method comprising:
the switching circuit inputs reference current to the load;
a second voltage detection circuit detects a second voltage across the load;
the resistance value calculation module calculates the resistance value of the load according to the reference current value and the second voltage value;
the resistance value calculation module calculates a second difference value between the resistance value of the load and a preset resistance value;
when the absolute value of the second difference is greater than zero, the second duty cycle control circuit adjusts the duty cycle of the input pulse width modulation signal to the load.
9. A load control device comprising a load control circuit as claimed in any one of claims 1 to 6.
10. An atomizer, characterized by comprising the load control circuit according to any one of claims 1-6 and the load control device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110451933.2A CN115191672A (en) | 2021-04-25 | 2021-04-25 | Load control circuit, method and device and atomization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110451933.2A CN115191672A (en) | 2021-04-25 | 2021-04-25 | Load control circuit, method and device and atomization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115191672A true CN115191672A (en) | 2022-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110451933.2A Pending CN115191672A (en) | 2021-04-25 | 2021-04-25 | Load control circuit, method and device and atomization device |
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| Country | Link |
|---|---|
| CN (1) | CN115191672A (en) |
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2021
- 2021-04-25 CN CN202110451933.2A patent/CN115191672A/en active Pending
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