CN111638747A - Constant-power output PWM control circuit and implementation method thereof - Google Patents
Constant-power output PWM control circuit and implementation method thereof Download PDFInfo
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- CN111638747A CN111638747A CN202010550345.XA CN202010550345A CN111638747A CN 111638747 A CN111638747 A CN 111638747A CN 202010550345 A CN202010550345 A CN 202010550345A CN 111638747 A CN111638747 A CN 111638747A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
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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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- 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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
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Abstract
The invention relates to a constant-power output PWM control circuit and an implementation method thereof. According to the invention, the current and the voltage of the load heating wire are collected, a signal representing the output power is calculated by the power operation circuit and is fed back to the PWM generator as a feedback signal, so that a PWM wave with a proper duty ratio is output to control the switching tube, and the purpose of outputting constant average power is achieved. Compared with the existing control scheme of constant power output, the control scheme has the advantages of relatively simple component and relatively low cost.
Description
Technical Field
The invention belongs to the technical field of atomization electronic cigarettes, and particularly relates to a constant-power output PWM control circuit and an implementation method thereof.
Background
Compared with the traditional cigarette, the electronic cigarette is more economical and practical, obviously reduces the harm of second-hand smoke to other people, and is gradually widely accepted by the market. Figure 1 is a block diagram of a typical electronic cigarette circuit that simulates a cigarette as an electronic cigarette by atomizing tobacco tar with an atomizer. The atomizer needs a switch control circuit to realize controllable smoke size and taste. Most of the common switch control circuits in the market at present are constant voltage PWM (pulse width modulation) output control or pseudo-constant power (constant effective output voltage) PWM output control.
The constant voltage PWM output control is to control the duty ratio of the output switch so that the average voltage supplied to the load (heater) voltage is constantly controllable even when the power supply voltage changes slowly. For example, if an average voltage level Vo to be output to the heater is desired, when the voltage of the power supply is Vsupply, the Duty ratio Duty of the PWM wave of the control circuit controlling the switch is automatically controlled to
For the pseudo-constant power output control, the duty ratio of the output switch is controlled, so that the effective voltage value supplied to the heating wire is still constantly controllable even if the power supply voltage changes slowly. If it is desired that the effective voltage output to the heater is Veff, the Duty ratio Duty of the PWM wave of the control circuit control switch is automatically controlled to be equal to when the voltage of the power supply is Vsupply
If the heater resistance value represents the bit RL, the average power PL generated by the heater during a PWM cycle can be expressed as
It can be seen that the constant effective voltage value does not generate a constant power value under different resistance values of the heating wire, so that the constant power is output in a pseudo-constant power mode.
The control scheme of the true constant power output, which is not changed along with the resistance value change of the heating wire, is a better control scheme, and is beneficial to realizing more stable smoke size and mouthfeel. The existing control scheme for true constant power output needs two units such as an analog-to-digital converter, a digital multiplier, a digital-to-analog converter and the like, and higher cost is needed.
Disclosure of Invention
The invention provides a PWM control circuit with constant power output and low cost and an implementation method thereof, which can provide real constant power output of an electric heating wire.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a constant power output PWM control circuit comprises a current sampling circuit, a voltage sampling circuit, a power operation circuit, a PWM generator and a power setting circuit; the signal input part of the current sampling circuit and the signal input part of the voltage sampling circuit are connected with a load heating wire and the drain electrode of the switch tube Psw respectively, the source electrode of the switch tube Psw is connected with the signal input parts of the power supply voltage Vsupply and the current sampling circuit respectively, the grid electrode of the switch tube Psw is connected with the signal output part of the PWM generator, the signal output part of the current sampling circuit and the signal output part of the voltage sampling circuit are connected with the signal input part of the power operation circuit, the signal output part of the power operation circuit is connected with the signal input part of the PWM generator, and the power setting circuit is connected with the signal input part of the current sampling circuit, the signal input part of the voltage sampling circuit and the signal input part of the power operation circuit respectively.
Preferably: the power operation circuit is an analog circuit based on a current multiplier or an analog circuit based on geometric mean operation.
Preferably: the current multiplier based analog circuit comprises a current multiplier Q1 and an amplifier Q2; the same-direction input end of the amplifier Q2 and the voltage samplingThe signal output end of the sample circuit is connected, and the reverse input end of the amplifier Q2 is respectively connected with the source electrode of the MOS tube and the grounding resistor Rv2iThe output end of the amplifier Q2 is connected with the gate of a MOS tube N1, the drain of the MOS tube N1 is connected with the signal input end I2 of a current multiplier Q1, the signal input end I1 of the current multiplier Q1 is connected with the signal output end of a current sampling circuit, the signal output end I0 of the current multiplier Q1 outputs a current signal representing output power, and the current signal is respectively connected with the signal input end of a PWM generator and a grounding resistor RP0And (4) connecting.
Preferably: the PWM generator includes a counter Q3, a digital-to-analog converter Q4, a comparator Q5, and a D flip-flop Q6, a reference voltage pin Vref _ DAC of the digital-to-analog converter Q4 is connected to a signal output terminal of the power operation circuit, a multi-bit digital input pin DAC [ Msb: 0]The digital-to-analog converter is connected with a signal output end M1 of a counter, an analog output pin DAC _ O of the digital-to-analog converter Q4 is connected with a non-inverting input end of a comparator Q5, an inverting input end of the comparator Q5 is connected with a reference voltage Vref, an output end of the comparator Q5 is connected with a CLK pin of a D flip-flop Q6, a RST pin of the D flip-flop Q6 is connected with a signal output end M2 of the counter, a D pin of the D flip-flop Q6 is connected with a power supply voltage, and a Q pin of the D flip-flop outputs a control signal PWM0To the gate of the switching transistor Psw.
A method for realizing a constant-power output PWM control circuit comprises the following steps:
s1, respectively collecting the current and the voltage of the load heating wire through a current sampling circuit and a voltage sampling circuit;
s2, calculating the current and the voltage of the load heating wire through a power operation circuit to obtain output power;
s3, feeding back the output power as a feedback signal to the PWM generator, and outputting a control signal of the switching tube through the PWM generator;
and S4, controlling the switching tube through the control signal of the switching tube to achieve the purpose of outputting constant power by the load heating wire.
Preferably: the output power in the step S2 is Kp1 · Po, where Kp1 is the attenuation coefficient, and Po is the average power output to the load heater.
Preferably: the calculation formula of the attenuation coefficient Kp1 is as follows:
Kp1＝m·Ki·Kv·Rpo/Rv2i
in the above formula, m is a multiplication coefficient, Ki is a current sampling attenuation coefficient, Kv is a voltage sampling attenuation coefficient, RpoTo ground resistance RP0Resistance value of Rv2i is a ground resistance Rv2iThe resistance value of (2).
Preferably: the calculation formula of the average output power of the load heating wire in the step S4 is as follows:
in the above equation, Pavg is the output average power of the load heater, Duty is the Duty ratio at which the switching tube Psw is turned on, and Vref is the reference voltage.
Preferably: the calculation formula of the Duty ratio Duty of the switching tube Psw being turned on is as follows:
in the above equation, Vo is the average voltage output to the load heater, and Io is the average current output to the load heater.
Preferably: the current multiplier based analog circuit comprises a current multiplier Q1 and an amplifier Q2; the same-direction input end of the amplifier Q2 is connected with the signal output end of the voltage sampling circuit, and the reverse-direction input end of the amplifier Q2 is respectively connected with the source electrode of the MOS tube and the grounding resistor Rv2iThe output end of the amplifier Q2 is connected with the gate of a MOS tube N1, the drain of the MOS tube N1 is connected with the signal input end I2 of a current multiplier Q1, the signal input end I1 of the current multiplier Q1 is connected with the signal output end of a current sampling circuit, the signal output end I0 of the current multiplier Q1 outputs a current signal representing output power, and the current signal is respectively connected with the signal input end of a PWM generator and the signal output end of a PWM generatorGround resistance RP0And (4) connecting.
Preferably: the PWM generator includes a counter Q3, a digital-to-analog converter Q4, a comparator Q5, and a D flip-flop Q6, a reference voltage pin Vref _ DAC of the digital-to-analog converter Q4 is connected to a signal output terminal of the power operation circuit, a multi-bit digital input pin DAC [ Msb: 0]The digital-to-analog converter is connected with a signal output end M1 of a counter, an analog output pin DAC _ O of the digital-to-analog converter Q4 is connected with a non-inverting input end of a comparator Q5, an inverting input end of the comparator Q5 is connected with a reference voltage Vref, an output end of the comparator Q5 is connected with a CLK pin of a D flip-flop Q6, a RST pin of the D flip-flop Q6 is connected with a signal output end M2 of the counter, a D pin of the D flip-flop Q6 is connected with a power supply voltage, and a Q pin of the D flip-flop outputs a control signal PWM0To the gate of the switching transistor Psw.
The invention has the following beneficial effects: according to the invention, the current and the voltage of the load heating wire are collected, a signal representing the output power is calculated by the power operation circuit and is fed back to the PWM generator as a feedback signal, so that a PWM wave with a proper duty ratio is output to control the switching tube, and the purpose of outputting constant average power is achieved. Compared with the existing control scheme of constant power output, the control scheme has the advantages of relatively simple component and relatively low cost.
Drawings
Figure 1 is a typical electronic cigarette circuit;
FIG. 2 is a block diagram of the present invention;
FIG. 3 illustrates a preferred power calculation circuit of the present invention;
fig. 4 is a preferred PWM generator of the present invention.
Detailed Description
In one embodiment, a constant power output PWM control circuit as shown in fig. 2 includes a current sampling circuit, a voltage sampling circuit, a power operation circuit, a PWM generator and a power setting circuit; the signal input part of the current sampling circuit and the signal input part of the voltage sampling circuit are connected with a load heating wire and the drain electrode of the switch tube Psw respectively, the source electrode of the switch tube Psw is connected with the signal input parts of the power supply voltage Vsupply and the current sampling circuit respectively, the grid electrode of the switch tube Psw is connected with the signal output part of the PWM generator, the signal output part of the current sampling circuit and the signal output part of the voltage sampling circuit are connected with the signal input part of the power operation circuit, the signal output part of the power operation circuit is connected with the signal input part of the PWM generator, and the power setting circuit is connected with the signal input part of the current sampling circuit, the signal input part of the voltage sampling circuit and the signal input part of the power operation circuit respectively.
The current sampling circuit outputs an attenuated output current signal which is Ki & Io; the voltage sampling circuit outputs an attenuated output voltage signal Kv & Vo; the power operation circuit is an analog operation circuit and converts input current and voltage signals into output signals containing power information; the operation may be a multiplication operation with an output Kp 1. Po, or a geometric averaging operation with an output
The power control circuit controls the attenuation coefficient Kp1 or Kp2 of the output sampling power by controlling the voltage and current sampling attenuation coefficients Kv and Ki and the coefficient of multiplication or geometric mean operation; the output signal of the power operation circuit is used as a feedback signal to be input to the PWM generator, and the PWM generator outputs a PWM wave with a proper duty ratio after processing the feedback signal, so that the switch Psw is controlled, and the power transmitted to the load by the power supply is constant and controllable.
In the embodiment of the invention, the power operation circuit is an analog circuit based on a current multiplier or an analog circuit based on geometric mean operation.
In another possible embodiment, as shown in fig. 3, the current multiplier based analog circuit includes a current multiplier Q1 and an amplifier Q2; the same-direction input end of the amplifier Q2 is connected with the signal output end of the voltage sampling circuit, and the reverse-direction input end of the amplifier Q2 is respectively connected with the source electrode of the MOS tube and the grounding resistor Rv2iThe output end of the amplifier Q2 is connected with the grid electrode of a MOS tube N1, and the MOS tube N1Is connected with a signal input end I2 of a current multiplier Q1, a signal input end I1 of the current multiplier Q1 is connected with a signal output end of a current sampling circuit, a signal output end I0 of the current multiplier Q1 outputs a current signal representing output power, and the current signal is respectively connected with a signal input end of a PWM generator and a grounding resistor RP0And (4) connecting.
The circuit converts the detected voltage signal Kv Vo into a current signal Kv Vo/Rv2iThen, the current signal is multiplied by the detected current signal Ki Io to obtain a current signal m Ki Io Kv Vo/R containing power informationv2iThe current signal flows through a resistor to generate a voltage signal m.Ki.Io.Kv.Vo.R containing power informationpo/Rv2i。
The multiplication circuit in the implementation is an analog circuit based on the square relation volt-ampere characteristic of the MOS tube, and the circuit can accurately calculate the output current representing the product of two paths of input currents, thereby accurately detecting the real-time power of the heating wire and further accurately controlling the average power of the heating wire. Compared with a digital scheme which needs to use a high-precision analog-to-digital converter and a multi-bit digital multiplier, the analog multiplier scheme has a simple structure, simplifies circuit design and time sequence verification, obviously reduces implementation cost and enhances reliability.
In another embodiment, as shown in fig. 4, the PWM generator includes a counter Q3, a digital-to-analog converter Q4, a comparator Q5 and a D flip-flop Q6, the digital-to-analog converter Q4 is a general multi-bit digital-to-analog converter, and the actual number of bits is determined by the specific system requirements. A reference voltage pin Vref _ DAC of the digital-to-analog converter Q4 is connected to a signal output terminal of the power operation circuit, and a multi-bit digital input pin DAC [ Msb: 0]The digital-to-analog converter Q4 is connected with a signal output end M1 of the counter, a DAC _ O of the digital-to-analog converter Q4 is connected with a non-inverting input end of a comparator Q5, an inverting input end of the comparator Q5 is connected with a reference voltage Vref, an output end of the comparator Q5 is connected with a CLK pin of a D flip-flop Q6, a RST pin of the D flip-flop Q6 is connected with a signal output end M2 of the counter, a D pin of the D flip-flop Q6 is connected with a power supply voltage, and a Q pin of the D flip-flop Q is connected with a QOutput control signal PWM0To the gate of the switching transistor Psw.
The output of the counter is used as a multi-bit input control signal of the digital-to-analog converter Q4, and the counter is increased linearly from an output start value of 0 to a maximum value under the control of a clock, and then is automatically reset to 0, and the process is repeated. The counter simultaneously outputs a reset pulse at the starting moment of each period, and the reset pulse is used for setting the output of the D trigger to be 0, so that an output switch Psw is opened; after the switch is opened, output current and output voltage are generated, and furthermore, Kp1 & Po representing real-time power is output by a current sampling circuit, a voltage sampling circuit and a power operation circuit, and the signals are used as reference voltage of a digital-to-analog converter Q4; in each counting period, the output of the counter, i.e. the linear increase of the digital input signal of the digital-to-analog converter Q4, makes the output voltage of the digital-to-analog converter Q4 increase correspondingly, and when the voltage exceeds the reference voltage Vref, the output of the comparator is set high, so that the output of the D flip-flop is high, and the switching tube is turned off. The switching tube is turned on again at the starting moment of the next counting period, and the operation is repeated. PWM is thus0The duty ratio of (1), namely the proportion of the conduction time of the switching tube in each counting period, is automatically controlled by the detected real-time power and the reference voltage value.
In each counting period, the PWM generator of the present embodiment equivalently accumulates the real-time power of the heating wire by using the counter and the digital-to-analog converter, and monitors the accumulated real-time power by using the reference voltage, thereby controlling the on-time of the switch of the heating wire and ensuring that the heating wire can obtain a constant average power in each period. The scheme has the advantages of simple structure and accurate control.
A method for realizing a constant-power output PWM control circuit comprises the following steps:
and S1, respectively collecting the current and the voltage of the load heating wire through the current sampling circuit and the voltage sampling circuit.
And S2, calculating the current and the voltage of the load heating wire through a power operation circuit to obtain the output power. The output power is Kp1 & Po, wherein Kp1 is an attenuation coefficient, and Po is the average power output to the heating wire of the load. The attenuation coefficient Kp1 is calculated as:
Kp1＝m·Ki·Kv·Rpo/Rv2i
in the above formula, m is a multiplication coefficient, Ki is a current sampling attenuation coefficient, Kv is a voltage sampling attenuation coefficient, RpoTo ground resistance RP0Resistance value of Rv2iTo ground resistance Rv2iThe resistance value of (2).
And S3, feeding back the output power as a feedback signal to the PWM generator, and outputting a control signal of the switching tube through the PWM generator.
And S4, controlling the switching tube through the control signal of the switching tube to achieve the purpose of outputting constant power by the load heating wire. The calculation formula of the average output power of the load heating wire is as follows:
in the above equation, Pavg is the output average power of the load heater, Duty is the Duty ratio at which the switching tube Psw is turned on, and Vref is the reference voltage.
The calculation formula of the Duty ratio Duty of the switching tube Psw being turned on is as follows:
in the above equation, Vo is the average voltage output to the load heater, and Io is the average current output to the load heater.
Claims (10)
1. A constant power output PWM control circuit is characterized in that: the power supply comprises a current sampling circuit, a voltage sampling circuit, a power operation circuit, a PWM generator and a power setting circuit; the signal input part of the current sampling circuit and the signal input part of the voltage sampling circuit are connected with a load heating wire and the drain electrode of the switch tube Psw respectively, the source electrode of the switch tube Psw is connected with the signal input parts of the power supply voltage Vsupply and the current sampling circuit respectively, the grid electrode of the switch tube Psw is connected with the signal output part of the PWM generator, the signal output part of the current sampling circuit and the signal output part of the voltage sampling circuit are connected with the signal input part of the power operation circuit, the signal output part of the power operation circuit is connected with the signal input part of the PWM generator, and the power setting circuit is connected with the signal input part of the current sampling circuit, the signal input part of the voltage sampling circuit and the signal input part of the power operation circuit respectively.
2. The constant power output PWM control circuit according to claim 1, wherein: the power operation circuit is an analog circuit based on a current multiplier or an analog circuit based on geometric mean operation.
3. The constant power output PWM control circuit according to claim 2, wherein: the current multiplier based analog circuit comprises a current multiplier Q1 and an amplifier Q2; the same-direction input end of the amplifier Q2 is connected with the signal output end of the voltage sampling circuit, and the reverse-direction input end of the amplifier Q2 is respectively connected with the source electrode of the MOS tube and the grounding resistor Rv2iThe output end of the amplifier Q2 is connected with the gate of a MOS tube N1, the drain of the MOS tube N1 is connected with the signal input end I2 of a current multiplier Q1, the signal input end I1 of the current multiplier Q1 is connected with the signal output end of a current sampling circuit, the signal output end I0 of the current multiplier Q1 outputs a current signal representing output power, and the current signal is respectively connected with the signal input end of a PWM generator and a grounding resistor RP0And (4) connecting.
4. The constant power output PWM control circuit according to claim 1, wherein: the PWM generator includes a counter Q3, a digital-to-analog converter Q4, a comparator Q5, and a D flip-flop Q6, a reference voltage pin Vref _ DAC of the digital-to-analog converter Q4 is connected to a signal output terminal of the power operation circuit, a multi-bit digital input pin DAC [ Msb: 0]Connected to the signal output terminal M1 of the counter, the analog output pin DAC _ O of the D/A converter Q4 is connected to the non-inverting input terminal of a comparator Q5, the inverting input terminal of the comparator Q5 is connected to a reference voltage Vref, and the ratioThe output end of the comparator Q5 is connected with the CLK pin of a D flip-flop Q6, the RST pin of the D flip-flop Q6 is connected with the signal output end M2 of the counter, the D pin of the Q6 of the D flip-flop is connected with a power supply voltage, and the Q pin of the D flip-flop outputs a control signal PWM0To the gate of the switching transistor Psw.
5. A method for realizing a constant-power output PWM control circuit is characterized by comprising the following steps:
s1, respectively collecting the current and the voltage of the load heating wire through a current sampling circuit and a voltage sampling circuit;
s2, calculating the current and the voltage of the load heating wire through a power operation circuit to obtain output power;
s3, feeding back the output power as a feedback signal to the PWM generator, and outputting a control signal of the switching tube through the PWM generator;
and S4, controlling the switching tube through the control signal of the switching tube to achieve the purpose of outputting constant power by the load heating wire.
6. The method of claim 5, wherein the PWM control circuit with constant power output comprises: the output power in the step S2 is Kp1 · Po, where Kp1 is an attenuation coefficient, and Po is an average power output to the load heater;
the calculation formula of the attenuation coefficient is as follows:
Kp1＝m·Ki·Kv·Rpo/Rv2i
in the above formula, m is a multiplication coefficient, Ki is a current sampling attenuation coefficient, Kv is a voltage sampling attenuation coefficient, RpoTo ground resistance RP0Resistance value of Rv2iTo ground resistance Rv2iThe resistance value of (2).
7. The method of claim 6, wherein the PWM control circuit with constant power output comprises: the calculation formula of the average output power of the load heating wire in the step S4 is as follows:
in the above equation, Pavg is the output average power of the load heater, Duty is the Duty ratio at which the switching tube Psw is turned on, and Vref is the reference voltage.
8. The method of claim 7, wherein the PWM control circuit with constant power output comprises: the calculation formula of the Duty ratio Duty of the switching tube Psw being turned on is as follows:
in the above equation, Vo is the average voltage output to the load heater, and Io is the average current output to the load heater.
9. The method of claim 5, wherein the PWM control circuit with constant power output comprises: the power operational circuit comprises a current multiplier Q1 and an amplifier Q2; the same-direction input end of the amplifier Q2 is connected with the signal output end of the voltage sampling circuit, and the reverse-direction input end of the amplifier Q2 is respectively connected with the source electrode of the MOS tube and the grounding resistor Rv2iThe output end of the amplifier Q2 is connected with the grid of a MOS tube N1, the drain of the MOS tube N1 is connected with the signal input end I2 of a current multiplier Q1, the signal input end I1 of the current multiplier Q1 is connected with the signal output end of a current sampling circuit, the signal output end I0 of the current multiplier Q1 outputs output power, and the output power is respectively connected with the signal input end of a PWM generator and a grounding resistor RP0And (4) connecting.
10. The method of claim 5, wherein the PWM control circuit with constant power output comprises: the PWM generator comprises a counter Q3, a digital-to-analog converter Q4, a comparator Q5 and a D trigger Q6, a reference voltage pin Vref _ DAC of the digital-to-analog converter Q4 is connected with a signal output end of the power operation circuit, and a multi-bit digital input of the digital-to-analog converter Q4 is led toPin DAC [ Msb: 0]The digital-to-analog converter is connected with a signal output end M1 of a counter, an analog output pin DAC _ O of the digital-to-analog converter Q4 is connected with a non-inverting input end of a comparator Q5, an inverting input end of the comparator Q5 is connected with a reference voltage Vref, an output end of the comparator Q5 is connected with a CLK pin of a D flip-flop Q6, a RST pin of the D flip-flop Q6 is connected with a signal output end M2 of the counter, a D pin of the D flip-flop Q6 is connected with a power supply voltage, and a Q pin of the D flip-flop outputs a control signal PWM0To the gate of the switching transistor Psw.
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| CN114384962A (en) * | 2022-01-21 | 2022-04-22 | 长沙锐逸微电子有限公司 | Constant power output algorithm and control chip |
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