CN118058536B - Control circuit integrating constant average and constant root mean square voltage output - Google Patents
Control circuit integrating constant average and constant root mean square voltage output Download PDFInfo
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- CN118058536B CN118058536B CN202410462784.3A CN202410462784A CN118058536B CN 118058536 B CN118058536 B CN 118058536B CN 202410462784 A CN202410462784 A CN 202410462784A CN 118058536 B CN118058536 B CN 118058536B
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- 238000000034 method Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 abstract description 3
- 239000003571 electronic cigarette Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229960002715 nicotine Drugs 0.000 description 2
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Natural products CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control circuit integrating constant average and constant root mean square voltage output, belonging to the technical field of integrated circuits, comprising: two-way voltage dividing resistor strings for providing voltage division of the reference voltage and the input voltage; a comparator for providing a duty cycle signal; a driving circuit module for driving the power tube; an oscillator; the logic circuit module is used for controlling the input and output switching of the comparator; the control circuit integrating constant average and constant root mean square voltage output realizes constant root mean square voltage output through time division multiplexing on the basis of constant average voltage output, does not need to add additional digital circuits and multipliers, simplifies circuit design and improves circuit integration level.
Description
Technical Field
The invention belongs to the technical field of integrated circuits, and particularly relates to a control circuit integrating constant average and constant root mean square voltage output.
Background
The electronic cigarette is produced by replacing the traditional paper cigarette with a safe product, and the electric heating wire is powered by the battery to atomize the nicotine, so that the user only sucks the nicotine and harmful substances such as tar, benzene and the like are removed. In the early 21 st century, electronic cigarettes have been developed for nearly 20 years, and the demands of electronic cigarette consumers for products are further expanded, so as to meet the demands of electronic cigarette users for taste and mouthfeel, requirements are put on control schemes of heating wires, and the existing schemes comprise constant average voltage control, constant root mean square voltage control, constant power control, constant temperature control and the like. The high integration can reduce the cost; the high-precision output voltage can bring good smoking experience to the user; the selectable working mode can meet the requirements of different users on the taste.
At present, the electronic cigarette chip is mostly controlled by adopting constant average voltage, the constant average voltage can be realized by a simple analog circuit, but because the output voltage and the input voltage are in a linear relation, the output power becomes a nonlinear function of the output voltage, so that under different input voltages, the heat of heating wires is different, and the taste is influenced; the root mean square voltage control can provide constant power for the heating wire, but needs to realize the linear relation between the square of the input voltage and the square of the output voltage, and needs to use a high-precision multiplier, so that an analog circuit is difficult to realize, and the circuit complexity is improved by adopting a digital multiplier; constant power control and constant temperature control further consider the impedance change of the heating wire, require a high-precision Analog-to-Digital Converter Analog-to-digital converter (ADC) to sample and quantify the input voltage, output voltage and heating wire impedance in real time, require huge digital circuit operation, generally require matching of an MCU (Microcontroller Unit), further increase the complexity of the circuit while improving the performance, and improve the design and production cost due to the existence of the MCU;
The common electronic cigarette chip usually adopts constant average value output, the circuit of the constant average value output mode is simple to realize, and the cost can be effectively controlled, but the heat of a heating wire is uncontrollable due to the nonlinear relation between the output power and the output voltage, so that the taste is influenced; the above-mentioned problems can be solved by adopting a constant rms voltage output mode, but the area of an analog circuit and a digital circuit needs to be multiplied, the complexity of the circuit is increased, and the cost is increased, so that a new control circuit integrating constant average and constant rms voltage output needs to be developed to solve the existing problems.
Disclosure of Invention
The invention aims to provide a control circuit integrating constant average and constant root mean square voltage output so as to solve the problem that the constant root mean square voltage output cannot be realized on the basis of the constant average voltage output.
In order to achieve the above purpose, the present invention provides the following technical solutions: a control circuit integrating constant average and constant root mean square voltage outputs, comprising: two-way voltage dividing resistor strings for providing voltage division of the reference voltage Vref and the input voltage Vin;
a comparator Comp for providing a duty cycle signal;
a driving circuit module DRV for driving the power tube Powermos;
An oscillator OSC;
A LOGIC circuit module LOGIC for controlling the switching of the inputs and outputs of the comparator Comp.
Preferably, the comparator Comp is connected with a switch S 1 and a switch S 2, and the comparator Comp is connected with the driving circuit module DRV and the LOGIC circuit module LOGIC through a switch S 3 and a switch S 1 respectively;
preferably, the driving circuit module DRV is connected to the power tube Powermos.
Preferably, the comparator Comp is connected to one end of the oscillator OSC, and the other end of the oscillator OSC is connected to the LOGIC block LOGIC.
Preferably, the step of the control circuit achieving a constant average voltage output comprises:
the voltage output is carried out through PWM signals, and the specific relation is as follows: (1)
Wherein V out is output voltage, V in is input voltage, D is duty ratio of PWM signal of output V out, T on is PWM high level time, T s is PWM constant period, and in order to keep output voltage V out constant, it is necessary to ensure that product of input voltage V in and T on is constant.
Preferably, the method for obtaining T on includes: for constant average voltage output, the switch S 1 and the switch S 3 are closed, the negative terminal of the comparator Comp is connected with the V ref, the positive terminal b i,bi of the comparator Comp is controlled by the oscillator OSC and the LOGIC circuit module LOGIC, the initial state of b i is b 1, when each clock clk triggers, the counter i is increased by 1, and when i=n, the initial state of b i is reset; when b i<Vref is reached, COMP is output high, the power tube Powermos is turned on, the turn-on time is T on, and the voltage of V out is equal to V in; when b i>Vref is reached, COMP output is low, the power tube Powermos is turned off, the turn-off time is T off,Ton plus T off, and T s is reached, and the voltage V out is equal to 0; when b i= Vref, there are: (2)
Wherein,For the node voltage division value corresponding to the resistor string, i is a counter for controlling the switching of the resistor string, and the initial time is 1,/>Representing the time period of the oscillator,/>Represented as a constant; when V ref is equal to V out, formula (2) is identical to formula (1), where T on is equal to i×t clk,Ts is equal to n×t clk, V ref is set as V out, and the duty ratio is obtained by formula (2), so as to satisfy the constant average output condition.
Preferably, the step of the control circuit implementing a constant root mean square voltage output includes:
The voltage output is carried out through PWM signals, and the specific relation is as follows: (3)
Slightly deforming the formula (3): (4)
And (3) making: (5)
Obtaining: (6)
If V out' is obtained from the formulas (6) and (1), T on is required.
Preferably, the specific method for obtaining T on includes dividing T s into two parts, 0 to T 1,T1 to T s, and when 0 to T 1, the switch S 1 and the switch S 4 are closed, and the system is equivalent to oneBits ADC (analog to digital converter) quantitatively encodes V ref through Vin voltage dividing resistor string, comparator Comp and logic module, and passes/>The encoded output i can be obtained after a number of CLK's, in which case there are: (7)
(8)
Wherein a i represents a partial pressure value of V ref;
Bringing formula (7) into formula (8) to obtain: (9)
From an examination of formulas (8) and (5), it can be seen that a i is equal to V out' when V ref is equal to V out;
When T 1 to T s, a i is connected to a switch S 2, a switch S 2 and a switch S 3 are closed, a switch S 1 and a switch S 4 are opened, and at the moment, constant average value outputs are consistent, so that the following results are obtained:
(10)
Similar to the constant average, only V ref is required to be set as V out of the target, and the duty ratio is obtained by the formula (8), satisfying the constant root mean square output condition.
The invention has the technical effects and advantages that: the control circuit integrating constant average and constant root mean square voltage output realizes constant root mean square voltage output through time division multiplexing on the basis of constant average voltage output, does not need to add an additional digital circuit and a multiplier, simplifies circuit design, improves circuit integration level, and reduces cost; meanwhile, two output modes are integrated inside, a user can select constant average voltage or constant root mean square voltage to output by himself, and user experience is improved.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of a constant average output timing according to the present invention;
FIG. 3 is a schematic diagram of a constant root mean square output timing according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention provides a control circuit integrating constant average and constant root mean square voltage outputs as shown in fig. 1;
the constant average output timing is shown in fig. 2, with PWM voltage output: (1)
V out is output voltage, V in is input voltage, D is duty ratio of PWM signal of output V out , T on is PWM high level time, T s is PWM constant period, and to keep V out constant, it is only necessary to satisfy that product of V in and T on is constant.
To achieve the above-mentioned functions, a specific scheme is proposed as shown in fig. 1, which includes two voltage dividing resistor strings for providing the divided voltages of the reference voltage V ref and the input voltage V in, respectively, a comparator Comp for providing the duty cycle signal, a driving circuit module DRV for driving the power transistor Powermos, an oscillator OSC and a LOGIC circuit module LOGIC for controlling the input and output switching of the comparator Comp.
For constant average voltage output, the switch S 1 and the switch S 3 are closed, the negative terminal of the comparator Comp is connected to V ref, the positive terminal b i,bi of the comparator Comp is controlled by the oscillator OSC and the LOGIC circuit module LOGIC, the initial state of b i is b 1, the counter i is increased by 1 when each clock clk triggers, and the initial state of b i is reset when i=n. When b i<Vref is reached, COMP is output high, the power tube Powermos is turned on, the turn-on time is T on, and the voltage of V out is equal to V in; when b i>Vref is reached, COMP output is low, the power tube Powermos is turned off, the turn-off time is T off,Ton plus T off, and T s is reached, and the voltage V out is equal to 0; when b i= Vref, there are: (2)
Wherein,For the node voltage division value corresponding to the resistor string, i is a counter for controlling the switching of the resistor string, and the initial time is 1,/>Representing the time period of the oscillator,/>Represented as a constant;
As can be seen from comparing the formula (1) with the formula (2), when V ref is equal to V out, the formula (2) is completely identical to the formula (1), and T on is equal to i×t clk,Ts is equal to n×t clk, so that only V ref needs to be set as the target V out, the system can obtain a proper duty ratio by itself through the formula (2), and the constant average output condition is satisfied.
The constant root mean square output timing is shown in fig. 3, with PWM voltage output: (3)
Slightly deforming the formula (3): (4)
And (3) making: (5)
Obtaining: (6)
From the observations of the formulas (6) and (1), it can be found that if V out 'is obtained, the desired T on can be obtained by the above-described constant average value output scheme, and the following description will be mainly given of the formula (5), i.e., V out'.
As shown in fig. 1 and 3, for the rms voltage output, T s is divided into two parts, 0 to T 1,T1 to T s, and when 0 to T 1, the switch S 1 and the switch S 4 are closed, and the system is equivalent to a simple oneBits ADC (analog to digital converter) quantitatively encodes V ref through Vin voltage dividing resistor string, comparator Comp and logic module, and passes/>The encoded output i can be obtained after a number of CLK's, in which case there are: (7)
(8)
Wherein a i represents a partial pressure value of V ref;
Bringing formula (7) into formula (8) to obtain: (9)
From an examination of formulas (8) and (5), it can be found that a i is equal to V out' when V ref is equal to V out.
At the time of T 1 to T s, a i is connected to the switch S 2, the switch S 2 and the switch S 3 are closed, the switch S 1 and the switch S 4 are opened, at the moment, the system is consistent with the constant average value output introduced above, and finally the following can be obtained: (10)
Similar to the constant average value, only V ref is required to be set as V out of the target, and the system can obtain proper duty ratio by itself through the formula (8) so as to meet the constant root mean square output condition.
For constant rms voltage output, V out' needs to be determined first at 0 to T 1, so that the duty cycle cannot be equal to 0, but in practical application, the input voltage and the output voltage cannot be 0, and only the time from 0 to T 1 is neededCLK is much smaller than T s and therefore has little effect on practical applications.
The low-voltage BCD technology is adopted, through candence simulation verification, constant average voltage output and constant root mean square voltage output in the input and output range of 2.2V-4.5V can be achieved, the output voltage precision is better than +/-30 mV, the target output voltage is set to be 3.72V, when the input voltage is greater than 3.72V, the output voltage can be stably output to be 3.72V, and when the input voltage is less than 3.72V, the duty ratio is changed to be 100%, and the output voltage is equal to the input voltage.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (5)
1. A control circuit for integrating constant average and constant root mean square voltage outputs, comprising:
Two-way voltage dividing resistor strings for providing voltage division of the reference voltage and the input voltage;
A comparator for providing a duty cycle signal;
a driving circuit module for driving the power tube;
an oscillator;
the logic circuit module is used for controlling the input and output switching of the comparator;
The comparator is connected with a switch S 1 and a switch S 2, and is connected with the driving circuit module and the logic circuit module through a switch S 3 and a switch S 4 respectively; the step of the control circuit achieving a constant average voltage output comprises: the voltage output is carried out through PWM signals, and the specific relation is as follows: (1)
Wherein, V out is output voltage, V in is input voltage, D is duty ratio of PWM signal of output V out , T on is PWM high level time, T s is PWM constant period, and in order to keep output voltage V out constant, it is necessary to ensure product of input voltage V in and T on to be constant;
the step of the control circuit realizing constant root mean square voltage output comprises the following steps: the voltage output is carried out through PWM signals, and the specific relation is as follows: (3)
Slightly deforming the formula (3): (4)
And (3) making: (5)
Obtaining: (6)
If V out' is obtained from the formulas (6) and (1), T on is required.
2. A control circuit integrating constant average and constant root mean square voltage outputs as claimed in claim 1, wherein: the driving circuit module is connected with the power tube.
3. A control circuit integrating constant average and constant root mean square voltage outputs as claimed in claim 1, wherein: the comparator is connected with one end of the oscillator, and the other end of the oscillator is connected with the logic circuit module.
4. A control circuit integrating constant average and constant root mean square voltage outputs as claimed in claim 1, wherein: the method for acquiring the T on comprises the following steps: the switch S 1 and the switch S 3 are closed, the negative end of the comparator is connected with the V ref, the positive end of the comparator is connected with the b i,bi and is controlled by the oscillator and the logic circuit module, the initial state of the b i is b 1, when each clock clk triggers, the counter i is increased by 1, and when i=n, the initial state of the b i is reset; when b i < Vref is carried out, the output of the comparator is high, the power tube is started, the starting time is T on, and the voltage of V out is equal to V in; when b i >Vref is reached, the comparator output is low, the power down tube is closed, the closing time is T off,Ton+Toff and T s, and the voltage of V out is equal to 0; when b i = Vref, there are: (i=1, 2. N) type (2)
Wherein,For the voltage division value of the node corresponding to the resistor string, i is a counter for controlling the switching of the resistor string, the initial time is 1,Representing the time period of the oscillator,/>Represented as a constant;
When V ref is equal to V out, formula (2) is identical to formula (1), where T on is equal to i×t clk,Ts is equal to n×t clk, V ref is set as V out, and the duty ratio is obtained by formula (2), so as to satisfy the constant average output condition.
5. A control circuit integrating constant average and constant root mean square voltage outputs as claimed in claim 1, wherein: the specific acquisition method of T on includes dividing T s into two parts, 0 to T 1,T1 to T s, and closing switch S 1 and switch S 4 when 0 to T 1, wherein the system is equivalent to oneBits ADC (analog to digital converter) quantitatively encodes V ref through Vin voltage dividing resistor string, comparator and logic module, and is subjected to/>The encoded output i can be obtained after a number of CLK's, in which case there are:
(7)
(8)
Wherein a i represents a partial pressure value of V ref;
Bringing formula (7) into formula (8) to obtain: (9)
Formula (8) and formula (5) yields a i equal to V out' when V ref is equal to V out;
When T 1 to T s, a i is connected to a switch S 2, a switch S 2 and a switch S 3 are closed, a switch S 1 and a switch S 4 are opened, and at the moment, constant average value outputs are consistent, so that the following results are obtained:
(10)
Setting V ref as V out of the target, obtaining the duty ratio by the formula (8), and satisfying the constant root mean square output condition.
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| FR1340004A (en) * | 1962-11-29 | 1963-10-11 | Licentia Gmbh | Process for producing a constant direct voltage or a constant alternating voltage of any frequency |
| CH640643A5 (en) * | 1978-12-21 | 1984-01-13 | Hans Byland | Method and device for controlling periodic current pulses on a constant average current value |
| GB201905251D0 (en) * | 2019-04-12 | 2019-05-29 | Nicoventures Trading Ltd | Vapor provision system and corresponding method |
| CN213426024U (en) * | 2020-09-30 | 2021-06-11 | 无锡市晶源微电子有限公司 | Output device capable of controlling and stably outputting root mean square voltage |
| CN113708626B (en) * | 2021-10-28 | 2022-02-08 | 南京模砾半导体有限责任公司 | Hundred percent duty cycle generating circuit suitable for COT voltage converter |
| CN114895175B (en) * | 2022-07-15 | 2022-10-21 | 无锡市晶源微电子有限公司 | Measuring circuit and measuring method |
| CN116268579B (en) * | 2023-03-08 | 2024-03-19 | 无锡市晶源微电子股份有限公司 | Variable power output control method and device of electronic cigarette device and electronic cigarette device |
| CN116807074A (en) * | 2023-08-14 | 2023-09-29 | 无锡市晶源微电子股份有限公司 | Electronic cigarette device with electronic lock |
| CN117439371A (en) * | 2023-10-17 | 2024-01-23 | 西南交通大学 | Constant root mean square voltage output circuit |
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