CN215603181U - Synchronous oscillation circuit and electronic cigarette - Google Patents
Synchronous oscillation circuit and electronic cigarette Download PDFInfo
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- CN215603181U CN215603181U CN202121164610.7U CN202121164610U CN215603181U CN 215603181 U CN215603181 U CN 215603181U CN 202121164610 U CN202121164610 U CN 202121164610U CN 215603181 U CN215603181 U CN 215603181U
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Abstract
The utility model discloses a synchronous oscillation circuit and an electronic cigarette, wherein the synchronous oscillation circuit comprises a power supply end, a grounding end, an oscillation circuit, a switch circuit and a synchronous control circuit, wherein the switch circuit and the oscillation circuit are connected in series between the power supply end and the grounding end; the synchronous control circuit is respectively connected with the oscillating circuit and the switch circuit; and the synchronous control circuit is used for detecting a zero-crossing signal of the oscillating current of the oscillating circuit and controlling the switching circuit to be switched on according to the zero-crossing signal so as to drive the oscillating circuit to work. The present embodiment makes the oscillation of the synchronous oscillation circuit controllable and reduces the switching loss of the switching circuit.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a synchronous oscillation circuit and an electronic cigarette.
Background
A series of dc power supplies, such as lithium batteries, have great limitations on the loads that can be driven, and for ac-driven loads, such as piezoelectric ceramic plates in electronic cigarettes, or electromagnetic-driven loads, such as electromagnetic heaters, dc power supplies cannot drive.
SUMMERY OF THE UTILITY MODEL
The main object of the present invention is to provide a synchronous oscillating circuit, intended to generate oscillations to drive various types of loads.
To achieve the above object, the present invention provides a synchronous oscillation circuit, including:
a power supply terminal;
a ground terminal;
an oscillation circuit;
the switching circuit and the oscillating circuit are connected in series between the power supply end and the grounding end; and
the synchronous control circuit is respectively connected with the oscillating circuit and the switch circuit;
the synchronous control circuit is used for detecting a zero-crossing signal of the oscillating current of the oscillating circuit and controlling the switching circuit to be switched on according to the zero-crossing signal so as to drive the oscillating circuit to work.
Optionally, the oscillation circuit includes a first inductor, a first capacitor, a feedback circuit, a first terminal, and a second terminal;
one of the first end and the second end of the oscillating circuit is connected with the switch circuit, and the other of the first end and the second end of the oscillating circuit, which is not connected with the switch circuit, is connected with the power supply end or the ground end;
one end of the first inductor is connected with the first end of the oscillating circuit, the other end of the first inductor is connected with the second end of the oscillating circuit, the first end of the feedback circuit is connected with the first end of the oscillating circuit, the second end of the feedback circuit is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the second end of the oscillating circuit.
Optionally, the feedback circuit comprises: the anode of the first diode is connected with the cathode of the second diode, and the cathode of the first diode is connected with the anode of the second diode; the common end of the anode of the first diode and the cathode of the second diode is the first end of the feedback circuit, and the common end of the cathode of the first diode and the anode of the second diode is the second end of the feedback circuit;
or, the feedback circuit includes a first resistor, one end of the first resistor is a first end of the feedback circuit, and the other end of the first resistor is a second end of the feedback circuit.
Optionally, the synchronization control circuit comprises:
the detection circuit is connected with the feedback circuit and is used for detecting the voltage polarities at two ends of the feedback circuit so as to determine the zero crossing point of the oscillation current and output a corresponding detection signal;
the PWM controller is used for generating and outputting a PWM signal;
the first input end of the AND gate logic circuit is connected with the PWM controller, and the second input end of the AND gate logic circuit is connected with the output end of the detection circuit; and the AND gate logic circuit is used for performing AND logic operation on the detection signal and the PWM signal and outputting the detection signal and the PWM signal to the switch circuit.
Optionally, the detection circuit comprises:
a comparator, a first voltage dividing circuit and a second voltage dividing circuit;
the input end of the first voltage division circuit is connected with the first end of the feedback circuit, and the output end of the first voltage division circuit is connected with the non-inverting input end of the comparator;
the input end of the second voltage division circuit is connected with the second end of the feedback circuit, the output end of the second voltage division circuit is connected with the inverting input end of the comparator,
the output end of the comparator is the output end of the detection circuit;
wherein a ratio of an input voltage to an output voltage of the first voltage division circuit is greater than a ratio of an input voltage to an output voltage of the second voltage division circuit.
Optionally, the comparator comprises an enable terminal, and the enable terminal of the comparator is connected with the PWM controller;
the synchronous control circuit also comprises an input unit, the input unit is connected with the PWM controller, and the input unit is used for accessing a starting signal;
the PWM controller is also used for outputting an enabling signal to an enabling end of the comparator when receiving the starting signal.
Optionally, the input unit is further configured to access a user selection signal;
and the PWM controller is also used for outputting a corresponding PWM signal to the AND gate logic circuit according to the user selection signal.
Optionally, the PWM controller further includes a load detection terminal, and the load detection terminal is connected to the output terminal of the detection circuit;
the PWM controller is also used for controlling the frequency of the output PWM signal according to the detection signal output by the detection circuit, so that the frequency of the PWM signal is consistent with the frequency of the detection signal.
Optionally, the switching circuit includes an electronic switch, a controlled end of the electronic switch is connected to an output end of the synchronous control circuit, an input end of the switching circuit is grounded, and an output end of the switching circuit is connected to the oscillating circuit.
The utility model also provides an electronic cigarette, which comprises the synchronous oscillation circuit, and
the piezoelectric ceramic piece is connected with the oscillating circuit of the synchronous oscillating circuit in series; and/or the presence of a gas in the gas,
an electromagnetic heater coupled to the oscillating circuit of the synchronous oscillating circuit.
According to the utility model, the synchronous control circuit is arranged to detect the zero crossing point signal of the oscillation current of the oscillation circuit, and the switching circuit is driven to be started when the oscillation current of the oscillation circuit crosses the zero crossing point, so that energy is provided for the oscillation circuit, the oscillation circuit is enabled to oscillate stably, and the switching loss of an electronic switch in the switching circuit is reduced. According to the utility model, the switching circuit is started when the oscillating current crosses zero, so that the switching loss of an electronic switch in the switching circuit is effectively reduced, and the service life of an electronic product using the synchronous oscillating circuit is prolonged.
According to the utility model, the synchronous control circuit is arranged to detect the oscillation period of the oscillation circuit, and the switching circuit is driven to be started when the oscillation current of the oscillation circuit crosses zero, so that energy is provided for the oscillation circuit, the oscillation circuit is enabled to oscillate stably, and the switching loss of an electronic switch in the switching circuit is reduced. According to the utility model, the switching circuit is started when the oscillating current crosses zero, so that the switching loss of an electronic switch in the switching circuit is effectively reduced, and the service life of an electronic product using the synchronous oscillating circuit is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a synchronous oscillator circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a synchronous oscillation circuit according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Synchronous control circuit | R1～R5 | First to |
| 20 | Switching circuit | L1 | |
| 30 | Oscillating circuit | C1 | First capacitor |
| IC1 | Comparator with a comparator circuit | Q1 | Electronic switch |
| IC2 | AND gate logic chip | FO | Load detection terminal |
| IC3 | PWM controller IC3 | EN | Enable terminal |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a synchronous oscillation circuit. The synchronous oscillating circuit can generate controllable oscillation to drive various types of loads. For example, the electromagnetic heater may be connected to the inductor of the synchronous oscillation circuit in a coupling manner, or the piezoelectric ceramic plate may be connected to the inductor of the synchronous oscillation circuit in a series manner, so as to drive the electromagnetic heater or the piezoelectric ceramic plate to operate.
Referring to fig. 1 and 2, in an embodiment of the present invention, the synchronous oscillation circuit includes:
a power supply terminal;
a ground terminal;
an oscillation circuit 30;
the switch circuit 20, the said switch circuit 20 and the said oscillating circuit 30 are connected in series between said power end and ground end; and
a synchronous control circuit 10, wherein the synchronous control circuit 10 is respectively connected with the oscillation circuit 30 and the switch circuit 20;
the synchronous control circuit 10 is configured to detect a zero-crossing signal of the oscillating current of the oscillating circuit 30, and control the switching circuit 20 to be turned on according to the zero-crossing signal, so as to drive the oscillating circuit 30 to operate.
In this embodiment, the oscillating circuit 30 may be any type of series resonant circuit or parallel resonant circuit, and is not limited herein. It should be noted that, after receiving the pulse signal, the resonant circuit is triggered to enter an oscillation state, and the oscillation current performs damped oscillation around a zero value.
The switching circuit 20, the switching circuit 20 may be implemented by one or more of a transistor, a MOS transistor IGBT or other electronic switches Q1. The switch circuit 20 and the oscillation circuit 30 are connected in series between the power supply terminal and the ground terminal; it is therefore possible to control whether or not the oscillation circuit 30 forms a loop with the power supply by controlling the on/off of the switch circuit 20. That is, by controlling the on/off of the switch circuit 20, a pulse signal can be output to the oscillation circuit 30, so as to provide energy for the oscillation circuit 30 to drive the oscillation circuit 30 to operate. However, in the switching circuit 20, when the electronic switch Q1 in the switching circuit 20 is turned on, the lower the voltage at the input terminal thereof, the smaller the loss in the electronic switch Q1, and the higher the voltage at the input terminal of the electronic switch Q1, the larger the loss in the electronic switch Q1. When the internal loss of the electronic switch Q1 exceeds a predetermined value, the electronic switch Q1 is burned out due to serious internal heat generation.
The synchronous control circuit 10, the synchronous control circuit 10 may detect an oscillation period of the oscillation circuit 30, that is, detect a zero-crossing point of an oscillation current when the oscillation circuit 30 oscillates, and a zero-crossing point signal of the oscillation current indicates that the oscillation current is at a zero-crossing point, where it should be noted that the oscillation circuit 30 is connected in series with the switching circuit 20, and when the oscillation current of the oscillation circuit 30 crosses the zero-crossing point, the switching circuit 20 is controlled to be turned on, so that a voltage at an input end (for example, a drain of an NMOS transistor) of the electronic switch Q1 in the switching circuit 20 is the lowest, and a loss of the electronic switch Q1 is the lowest. That is, the switching frequency of the switching circuit 20 is synchronized with the polarity inversion frequency of the oscillating current of the oscillating circuit 30, so that the switching loss of the switching circuit 20 can be reduced, and the electronic switch Q1 in the switching circuit 20 can be effectively protected. The service life of an electronic product using the synchronous oscillation circuit is prolonged.
The utility model detects the zero crossing point signal of the oscillation current of the oscillation circuit 30 by arranging the synchronous control circuit 10, and drives the switch circuit 20 to be started when the oscillation current of the oscillation circuit 30 crosses the zero crossing point, so as to provide energy for the oscillation circuit 30, enable the oscillation circuit 30 to oscillate stably, and reduce the switching loss of the electronic switch Q1 in the switch circuit 20. According to the utility model, the switching circuit 20 is started when the oscillating current crosses zero, so that the switching loss of the electronic switch Q1 in the switching circuit 20 is effectively reduced, and the service life of an electronic product using the synchronous oscillating circuit is prolonged.
Referring to fig. 2, in one embodiment, the oscillation circuit 30 includes: the circuit comprises a first inductor L1, a first capacitor C1, a feedback circuit, a first end and a second end;
one of the first terminal and the second terminal of the oscillation circuit 30 is connected to the switch circuit 20, and the other of the first terminal and the second terminal of the oscillation circuit 30, which is not connected to the switch circuit 20, is connected to the power supply terminal or the ground terminal;
one end of the first inductor L1 is connected to the first end of the oscillator circuit 30, the other end of the first inductor L1 is connected to the second end of the oscillator circuit 30, the first end of the feedback circuit is connected to the first end of the oscillator circuit 30, the second end of the feedback circuit is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the second end of the oscillator circuit 30.
In practical applications, the first inductor L1 and the first capacitor C1 may form a parallel resonant circuit, and the feedback circuit is further connected in series with the first capacitor C1 to feed back the voltage polarity change of the first capacitor C1, that is, the change of the oscillating current of the oscillating circuit 30.
In this embodiment, the parallel resonant circuit/the series resonant circuit can perform damping oscillation when receiving the pulse signal, and the oscillation current can be output through the feedback circuit.
Referring to fig. 2, in an embodiment, the feedback circuit includes:
the feedback circuit includes: the anode of the first diode is connected with the cathode of the second diode, and the cathode of the first diode is connected with the anode of the second diode; the common end of the anode of the first diode and the cathode of the second diode is the first end of the feedback circuit, and the common end of the cathode of the first diode and the anode of the second diode is the second end of the feedback circuit;
or, the feedback circuit includes a first resistor R1, one end of the first resistor R1 is a first end of the feedback circuit, and the other end of the first resistor R1 is a second end of the feedback circuit.
In this embodiment, the feedback circuit is used to output the variation of the oscillating current of the oscillating circuit 30 in the form of voltages at two ends, so that the synchronous control circuit 10 only needs to detect the voltage polarities at two ends of the feedback circuit, and when the voltage polarities at two ends of the feedback circuit jump, the zero crossing point of the oscillating current can be confirmed.
Specifically, when the feedback circuit includes a first diode and a second diode, a common end of an anode of the first diode and a cathode of the second diode is a first end of the feedback circuit, and a common end of an anode of the second diode and a cathode of the first diode is a second end of the feedback circuit. When the oscillation current flows from the first end of the feedback circuit to the second end of the feedback circuit, the first diode is conducted and the second diode is cut off, and at the moment, the voltage difference between the first end and the second end of the feedback circuit is 0.7V. When the oscillation current flows from the second end of the feedback circuit to the first end of the feedback circuit, the first diode is cut off and the second diode is turned on, and at the moment, the voltage difference between the first end and the second end of the feedback circuit is negative 0.7V. Therefore, when the voltage difference between the first terminal and the second terminal of the feedback circuit jumps from minus 0.7V to 0.7V, the oscillating current of the oscillating circuit 30 is at a zero crossing point. The synchronous control circuit 10 can obtain the oscillation period of the oscillation circuit 30 by detecting the voltage values at the two ends of the first diode and the second diode, and obtain the zero-crossing point of the oscillation current of the oscillation circuit 30.
When the feedback circuit comprises the first resistor R1, the first end of the first resistor R1 is the first end of the feedback circuit, and the second end of the first resistor R1 is the second end of the feedback circuit. When the oscillating current flows from the first end of the feedback circuit to the second end of the feedback circuit, the current flows from the first end to the second end of the first resistor R1, and the voltage difference between the first end and the second end of the first resistor R1 is a positive value. When the oscillating current flows from the second end of the feedback circuit to the first end of the feedback circuit, the current flows from the second end of the first resistor R1 to the first end, and the voltage difference between the first end and the second end of the first resistor R1 is a negative value. Therefore, by detecting the voltage value across the first resistor R1, when the voltage across the first resistor R1 jumps, the synchronization control circuit 10 can detect the zero-crossing point time of the oscillating circuit 30, that is, obtain the oscillation period of the oscillating circuit 30, and obtain the zero-crossing point of the oscillating current of the oscillating circuit 30.
Referring to fig. 2, in an embodiment, the synchronization control circuit 10 includes:
the detection circuit is connected with the feedback circuit and is used for detecting the voltage polarities at two ends of the feedback circuit so as to determine the zero crossing point of the oscillation current and output a corresponding detection signal;
a PWM controller IC3, the PWM controller IC3 is used for generating and outputting a PWM signal;
the first input end of the AND gate logic circuit is connected with the PWM controller IC3, and the second input end of the AND gate logic circuit is connected with the output end of the detection circuit; the and logic circuit is configured to perform an and logic operation on the detection signal and the PWM signal, and output the result to the switch circuit 20.
In this embodiment, the detection circuit may detect a voltage value across the feedback circuit, determine a zero crossing point of the oscillating current when a voltage difference between the first terminal and the second terminal of the feedback circuit changes from negative to positive, and output a corresponding control signal, such as a high level signal.
The PWM controller IC3 may output a PWM signal using an MCU or a dedicated PWM controller IC3IC 3.
The and logic circuit may be a two-input and logic circuit or an and logic chip IC2, in this embodiment, taking the and logic chip IC2 as an example, the and logic chip IC2 outputs a high level when both the first input terminal and the second input terminal are high levels, otherwise, outputs a low level.
In this embodiment, the and logic chip IC2 does not output the high level switch circuit 20 to turn on whether the PWM signal is in the high state or the detection circuit outputs the high signal. Only when the PWM signal output by PWM controller IC3 is high and the detection circuit determines the zero crossing of the oscillating current of oscillating circuit 30. The and logic chip IC2 will output a high signal to control the switch circuit 20 to turn on.
Therefore, when the switching circuit 20 is turned on, the zero crossing point of the oscillation current of the oscillation circuit 30 can be ensured to reduce the switching loss of the switching circuit 20, and the on-off frequency of the electronic switch Q1 can be controlled by adjusting the duty ratio and the frequency of the PWM signal, so that the on-time of the switching circuit 20 can be further controlled, the longer the on-time of the switching circuit 20 is, the more electric energy is stored in the oscillation circuit 30, the higher the power of the electromagnetic heater to be driven by the oscillation circuit 30 is, and the controllability of the synchronous oscillation circuit is effectively improved.
Referring to fig. 2, in one embodiment, the detection circuit includes:
a comparator IC1, a first voltage dividing circuit, and a second voltage dividing circuit;
the input end of the first voltage division circuit is connected with the first end of the feedback circuit, and the output end of the first voltage division circuit is connected with the non-inverting input end of the comparator IC 1;
an input terminal of the second voltage divider circuit is connected to a second terminal of the feedback circuit, an output terminal of the second voltage divider circuit is connected to an inverting input terminal of the comparator IC1,
the output end of the comparator IC1 is the output end of the detection circuit;
wherein a ratio of an input voltage to an output voltage of the first voltage division circuit is greater than a ratio of an input voltage to an output voltage of the second voltage division circuit.
Specifically, the first voltage dividing circuit includes a second resistor R2 and a third resistor R3; the first end of the second resistor R2 is the input end of the first voltage-dividing circuit, the second end of the second resistor R2 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is grounded, and the common end of the second resistor R2 and the third resistor R3 is the output end of the first voltage-dividing circuit.
The second voltage division circuit comprises a fourth resistor R4 and a fifth resistor R5, the first end of the fourth resistor R4 is the input end of the second voltage division circuit, the second end of the fourth resistor R4 is connected with the first end of the fifth resistor R5, the second end of the fifth resistor R5 is grounded, and the common end of the fourth resistor R4 and the fifth resistor R5 is the output end of the second voltage division circuit.
The ratio of the third resistor R3 to the fourth resistor R4 is smaller than the ratio of the fifth resistor R5 to the sixth resistor, so that the ratio of the input voltage to the output voltage of the first voltage divider circuit is larger than the ratio of the input voltage to the output voltage of the second voltage divider circuit. In this way, when the oscillation circuit 30 of the comparator IC1 does not start to operate, the non-inverting input terminal of the comparator IC1 may be made larger than the inverting input terminal, so that when the comparator IC1 outputs a high level and the PWM signal is at the high level, the and logic circuit turns on the switch circuit 20 to drive the oscillation circuit 30 to operate, and then the detection circuit detects the oscillation current of the oscillation circuit 30 again to start to operate the synchronous oscillation circuit.
It should be noted that the ratio of the input voltage to the output voltage of the first voltage divider circuit is only slightly larger than the ratio of the input voltage to the output voltage of the second voltage divider circuit, specifically, the comparator IC1 can output a high level when the oscillation circuit 30 is not in operation, and the comparator IC1 can output a low level when the second end voltage of the feedback circuit is greater than the first end voltage, for example, greater than 0.7V.
Referring to fig. 2, in an embodiment, the comparator IC1 includes an enable terminal EN, and the enable terminal EN of the comparator IC1 is connected to the PWM controller IC 3;
the synchronous control circuit 10 further includes an input unit, the input unit is connected to the PWM controller IC3, and the input unit is used for receiving a start signal;
the PWM controller IC3 is further configured to output an enable signal to an enable terminal EN of the comparator IC1 when receiving the enable signal.
The input unit may be a key, a touch screen or other input devices. By triggering the start signal to the PWM controller IC3, the PWM controller outputs the PWM signal again, and outputs the enable signal to control the comparator IC1 to enable, so that the entire synchronous oscillation circuit starts to operate, that is, in this embodiment, the synchronous oscillation circuit may be controlled to be turned on/off by the input unit.
Further, the input unit is also used for accessing a user selection signal;
the PWM controller IC3 is further configured to output a corresponding PWM signal to the and logic circuit according to the user selection signal.
In this embodiment, the PWM controller IC3 is further configured to control a duty ratio and a frequency of the PWM signal according to the user selection signal, and by controlling the duty ratio of the PWM signal, the charging time of the oscillation circuit 30 may be adjusted, that is, the working power of the load such as the electromagnetic heater/the piezoelectric ceramic plate connected to the oscillation circuit 30 is adjusted. That is, the present embodiment makes the load operation power driven by the oscillation circuit 30 adjustable.
Referring to fig. 2, in an embodiment, the PWM controller further includes a load detection terminal FO connected to an output terminal of the detection circuit;
the PWM controller IC3 is further configured to control the frequency of the output PWM signal according to the detection signal output by the detection circuit, so that the frequency of the PWM signal coincides with the frequency of the detection signal.
The oscillation period of the oscillating circuit 30 can be determined by the jump of the output level of the detection circuit, that is, the detection circuit (comparator IC1) will detect the voltage jump of the two ends of the feedback circuit and output the rectified square wave signal which is consistent with the oscillation period of the oscillating circuit 30, and the frequency of the square wave signal is the resonant frequency of the resonant circuit. Therefore, the PWM controller IC3 can detect the square wave signal to improve the detection accuracy, and output the PWM signal having a frequency identical to that of the square wave signal, so that the PWM signal is synchronized with the oscillation circuit 30, thereby allowing the oscillation circuit 30 to operate in a resonance state.
In addition, it should be noted that, when a load or the like affects the inductive reactance of the oscillating circuit 30, different loads affect the inductive reactance of the oscillating circuit 30 differently, and the period of the ringing of the oscillating circuit 30, that is, the resonant period, is related to the inductive reactance of the circuit, so that the period of the square wave signal can be detected, and the period corresponds to the type of the load, so as to determine the type and the size of the load.
In addition, the working state of the load can also be determined, taking the electromagnetic heater as an example, the electromagnetic heater is coupled with the first inductor L1, and further participates in controlling the inductance of the first inductor L1, therefore, the change in temperature of the electromagnetic heater affects the inductance of the first inductor L1, the temperature of the electromagnetic heater is in proportional relation with the inductance of the first inductor L1, and thus, the temperature of the electromagnetic heater is different, the inductance of the first inductor L1 is different, and the period of the square wave signal output by the detection circuit is different. Therefore, the temperature change of the load can be determined by detecting the output square wave signal of the detection circuit, and the working power of the synchronous oscillation circuit can be further controlled.
Referring to fig. 2, in an embodiment, the switching circuit 20 includes an electronic switch Q1, a controlled terminal of the electronic switch Q1 is connected to the output terminal of the synchronous control circuit 10, an input terminal of the switching circuit 20 is connected to ground, and an output terminal of the switching circuit 20 is connected to the oscillating circuit 30.
The electronic switch Q1 may be one or more of a triode, a MOS transistor, or an IGBT. In the present embodiment, the electronic on/off is controlled to control whether the oscillation circuit 30 forms a loop with the power supply, so as to output a pulse signal to the oscillation circuit 30.
In order to better explain the principle of the present invention, the following detailed description is given of the principle of the present invention in conjunction with the above-mentioned embodiments.
Referring to fig. 2, first, the ratio of the input voltage to the output voltage of the first voltage divider circuit is greater than the ratio of the input voltage to the output voltage of the second voltage divider circuit, so that when the enable terminal EN of the comparator IC1 receives an enable signal, the comparator IC1 outputs a high level signal, and when the PWM signal jumps to a high level, the and gate logic circuit outputs a high level signal, and the electronic switch Q1 is controlled to be turned on. At this time, the power supply, the first inductor L1, the electronic switch Q1 and the ground form a loop, and the first inductor L1 starts to store energy.
Until the PWM signal jumps from high level to low level, the and gate logic circuit outputs low level to control the electronic switch Q1 to turn off, at this time, the first inductor L1, the first capacitor C1 and the first resistor R1 form a loop, the first inductor L1 charges the first capacitor C1, until the first inductor L1 finishes discharging, the first capacitor C1 starts discharging, so that the voltage of the second end of the resistor is greater than the voltage of the first end, at this time, the comparator IC1 outputs low level signal, and when the first capacitor C1 finishes discharging, the first inductor L1 starts discharging, so that the voltage of the first end of the resistor is greater than the voltage of the second end,
at this time, the comparator IC1 outputs a high level signal until the PWM signal jumps from a low level signal to a high level signal, the and logic circuit outputs a high level signal at this time, and controls the electronic switch Q1 to turn on, so as to supplement energy to the oscillation circuit 30 composed of the first inductor L1 and the first capacitor C1, and the first inductor L1 stores energy, and the cycle is repeated, so that the oscillation circuit 30 composed of the first inductor L1 and the first capacitor C1 oscillates in synchronization with the PWM signal.
In the present invention, since the and gate logic circuit is turned on only when the oscillation current of the oscillation circuit 30 crosses zero and the PWM signal is at a high level, the synchronous oscillation circuit of the present embodiment not only can reduce the switching loss of the electronic switch Q1, but also can control the operating state of the oscillation circuit 30 by controlling the frequency and duty ratio of the PWM signal.
The utility model further provides an electronic cigarette, which comprises the synchronous oscillation circuit and a piezoelectric ceramic piece or an electromagnetic heater, wherein the specific structure of the synchronous oscillation circuit refers to the embodiments, and the second subject adopts all technical schemes of all the embodiments, so that the electronic cigarette at least has all the beneficial effects brought by the technical schemes of the embodiments, and details are not repeated herein.
When the electronic cigarette comprises a piezoelectric ceramic piece, the piezoelectric ceramic piece is connected in series with the oscillating circuit 30 of the synchronous oscillating circuit;
when the electronic cigarette includes an electromagnetic heater, the electromagnetic heater is coupled to the oscillation circuit 30 of the synchronous oscillation circuit.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A synchronous oscillator circuit, comprising:
a power supply terminal;
a ground terminal;
an oscillation circuit;
the switching circuit and the oscillating circuit are connected in series between the power supply end and the grounding end; and
the synchronous control circuit is respectively connected with the oscillating circuit and the switch circuit;
the synchronous control circuit is used for detecting a zero-crossing signal of the oscillating current of the oscillating circuit and controlling the switching circuit to be switched on according to the zero-crossing signal so as to drive the oscillating circuit to work.
2. The synchronous oscillator circuit of claim 1, wherein the oscillator circuit comprises a first inductor, a first capacitor, a feedback circuit, a first terminal, and a second terminal;
one of the first end and the second end of the oscillating circuit is connected with the switch circuit, and the other of the first end and the second end of the oscillating circuit, which is not connected with the switch circuit, is connected with the power supply end or the ground end;
one end of the first inductor is connected with the first end of the oscillating circuit, the other end of the first inductor is connected with the second end of the oscillating circuit, the first end of the feedback circuit is connected with the first end of the oscillating circuit, the second end of the feedback circuit is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the second end of the oscillating circuit.
3. The synchronous oscillation circuit of claim 2,
the feedback circuit includes: the anode of the first diode is connected with the cathode of the second diode, and the cathode of the first diode is connected with the anode of the second diode; the common end of the anode of the first diode and the cathode of the second diode is the first end of the feedback circuit, and the common end of the cathode of the first diode and the anode of the second diode is the second end of the feedback circuit;
or, the feedback circuit includes a first resistor, one end of the first resistor is a first end of the feedback circuit, and the other end of the first resistor is a second end of the feedback circuit.
4. The synchronous oscillation circuit of claim 2, wherein the synchronous control circuit comprises:
the detection circuit is connected with the feedback circuit and is used for detecting the voltage polarities at two ends of the feedback circuit so as to determine the zero crossing point of the oscillation current and output a corresponding detection signal;
the PWM controller is used for generating and outputting a PWM signal;
the first input end of the AND gate logic circuit is connected with the PWM controller, and the second input end of the AND gate logic circuit is connected with the output end of the detection circuit; and the AND gate logic circuit is used for performing AND logic operation on the detection signal and the PWM signal and outputting the detection signal and the PWM signal to the switch circuit.
5. The synchronous oscillation circuit of claim 4 wherein the detection circuit comprises:
a comparator, a first voltage dividing circuit and a second voltage dividing circuit;
the input end of the first voltage division circuit is connected with the first end of the feedback circuit, and the output end of the first voltage division circuit is connected with the non-inverting input end of the comparator;
the input end of the second voltage division circuit is connected with the second end of the feedback circuit, the output end of the second voltage division circuit is connected with the inverting input end of the comparator,
the output end of the comparator is the output end of the detection circuit;
wherein a ratio of an input voltage to an output voltage of the first voltage division circuit is greater than a ratio of an input voltage to an output voltage of the second voltage division circuit.
6. The synchronous oscillator circuit of claim 5, wherein the comparator includes an enable terminal, the enable terminal of the comparator being connected to the PWM controller;
the synchronous control circuit also comprises an input unit, the input unit is connected with the PWM controller, and the input unit is used for accessing a starting signal;
the PWM controller is also used for outputting an enabling signal to an enabling end of the comparator when receiving the starting signal.
7. The synchronous oscillator circuit of claim 6, wherein the input unit is further configured to access a user selection signal;
and the PWM controller is also used for outputting a corresponding PWM signal to the AND gate logic circuit according to the user selection signal.
8. The synchronous oscillator circuit of claim 4, wherein the PWM controller further comprises a load sense terminal connected to an output terminal of the sense circuit;
the PWM controller is also used for controlling the frequency of the output PWM signal according to the detection signal output by the detection circuit, so that the frequency of the PWM signal is consistent with the frequency of the detection signal.
9. The synchronous oscillator circuit of claim 1, wherein the switching circuit comprises an electronic switch having a controlled terminal connected to the output terminal of the synchronous control circuit, an input terminal of the switching circuit connected to ground, and an output terminal of the switching circuit connected to the oscillator circuit.
10. An electronic cigarette, comprising: a synchronous oscillator circuit as claimed in any one of claims 1 to 9, and
the piezoelectric ceramic piece is connected with the oscillating circuit of the synchronous oscillating circuit in series; and/or the presence of a gas in the gas,
an electromagnetic heater coupled to the oscillating circuit of the synchronous oscillating circuit.
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| CN202121164610.7U CN215603181U (en) | 2021-05-27 | 2021-05-27 | Synchronous oscillation circuit and electronic cigarette |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116584714A (en) * | 2023-07-18 | 2023-08-15 | 杭州拓尔微电子有限公司 | Start control device, electronic atomizer and module thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116584714A (en) * | 2023-07-18 | 2023-08-15 | 杭州拓尔微电子有限公司 | Start control device, electronic atomizer and module thereof |
| CN116584714B (en) * | 2023-07-18 | 2023-10-20 | 杭州拓尔微电子有限公司 | Start control device, electronic atomizer and module thereof |
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