CN209787046U - Atomization sheet drive circuit - Google Patents
Atomization sheet drive circuit Download PDFInfo
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- CN209787046U CN209787046U CN201920926856.XU CN201920926856U CN209787046U CN 209787046 U CN209787046 U CN 209787046U CN 201920926856 U CN201920926856 U CN 201920926856U CN 209787046 U CN209787046 U CN 209787046U
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Abstract
The utility model relates to an atomizing piece drive circuit, it includes the signal supply circuit, boost circuit, high pass filter circuit, singlechip and power sampling circuit, the signal supply circuit, boost circuit, the mutual electric connection of high pass filter circuit and power sampling circuit, the signal supply circuit is equipped with the switching signal input part, boost circuit is equipped with first power input end, high pass filter circuit is equipped with atomizing piece link, power sampling circuit is equipped with the power sample end, the singlechip is equipped with second power input end, switching signal input end and power sample end respectively with singlechip electric connection. The atomization plate driving circuit automatically identifies the working frequency of the atomization plate and controls the required working power within the allowable power range of the machine design.
Description
Technical Field
The utility model relates to an atomizing piece drive circuit, especially an atomizing piece drive circuit who mainly is applied to humidifier, fragrant smoked machine.
Background
The ceramic atomization plate is driven by a field effect tube from the initial self-oscillation type drive (due to triode parameter difference, mass production is very unfavorable, power regulation is realized by triode series connection partial pressure, heating is serious, aging is very fast, and the service life of a product is short), and the advantage of extremely low switching impedance obviously prolongs the service life of the whole machine. The generated fixed frequency driving, frequency following driving and other excitation type atomizing sheet driving circuits are generated. However, the three kinds of frequencies of the ceramic atomizing plate have far differences, so that a driving signal which can be used in all three frequency ranges cannot be provided, and the ceramic atomizing plate only needs to be designed independently according to the three frequencies. When the assembled product is replaced by a ceramic atomizing plate with other frequencies, the machine cannot work at the corresponding frequency.
Disclosure of Invention
An object of the utility model is to provide a rational in infrastructure, automatic atomizing piece drive circuit who matches atomizing piece frequency.
The purpose of the utility model is realized like this:
The utility model provides an atomizing piece drive circuit, includes signal supply circuit, boost circuit, high pass filter circuit and singlechip, its characterized in that: still include power sampling circuit, signal supply circuit, boost circuit, high pass filter circuit and the mutual electric connection of power sampling circuit, the signal supply circuit is equipped with switching signal input, boost circuit is equipped with first power input, high pass filter circuit is equipped with the atomizing piece link, power sampling circuit is equipped with power sample end, the singlechip is equipped with second power input, switching signal input and power sample end respectively with singlechip electric connection. The atomization plate driving circuit automatically identifies the working frequency of the atomization plate and controls the required working power within the allowable power range of the machine design.
The purpose of the utility model can also adopt the following technical measures to solve:
More specifically, the signal supply circuit comprises a first resistor, a first diode, a triode and a third resistor, wherein the switching signal input end is connected with one end of the first diode and the base electrode of the triode through the first resistor, the other end of the first diode is connected with the collector electrode of the triode, and the collector electrode and the emitter electrode of the triode are connected with the third resistor in parallel. The first resistor and the first diode of the signal supply circuit provide pulse high voltage to turn on the field effect transistor MS 1; the first resistor, the triode and the third resistor provide pulse low voltage, so that the G pole and the S pole of the field effect transistor form back voltage for rapid cut-off.
As a further scheme, the boost circuit includes a first inductor, a field effect transistor, and a second capacitor, the first power input end is connected to the drain of the field effect transistor and one end of the second capacitor through the first inductor, the other end of the second capacitor is grounded, and the control electrode and the source of the field effect transistor are respectively connected to the collector and the emitter of the triode. When the field effect transistor is cut off, the current stored by the first inductor is supplied to the second capacitor and is superposed with a 24V direct-current power supply to obtain + 48V; when the field effect transistor is conducted, the first inductor is charged, +48V voltage at the second capacitor is released, and-48V voltage is obtained due to the fact that the current directions are opposite.
As a further scheme, the high-pass filter circuit comprises a second inductor and a third capacitor, one end of the second inductor is connected with one end of the second capacitor, the other end of the second inductor is grounded through the third capacitor, and the connecting end of the third capacitor is an atomizing sheet connecting end. The high-pass filter circuit is used for filtering ultrahigh frequency signals and preventing external radiation through the atomization sheet.
As a further scheme, the power sampling circuit comprises a fourth resistor, a second resistor and a first capacitor, wherein one end of the fourth resistor is connected with an emitter of the triode, and the other end of the fourth resistor is grounded; one end of the second resistor is connected with an emitting electrode of the triode, the other end of the second resistor is connected with the power sampling end and one end of the first capacitor, and the other end of the first capacitor is grounded. Since a voltage of-48 v is passed through the fourth resistor, it can represent the operating current of the atomizing plate during the negative half-wave period. After the second resistor and the first capacitor are subjected to resistance-capacitance filtering, the voltage is converted into direct current voltage in proportion to the direct current voltage.
as a further scheme, the dry burning prevention circuit is further included, the dry burning prevention circuit is electrically connected with the high-pass filter circuit, the dry burning prevention circuit is provided with a dry burning signal detection end, and the dry burning signal detection end is connected with the single chip microcomputer. Since the ceramic atomizing plate must be in contact with liquid to work, otherwise the ceramic atomizing plate is broken due to rapid temperature rise. In order to prevent the water detection mechanism from being damaged or the user from operating illegally, the atomizing sheet anti-dry heating function is specially added.
As a further scheme, the dry burning prevention circuit comprises a fourth capacitor, a fifth resistor, a second diode, a sixth resistor, a seventh resistor and a fifth capacitor, one end of the fourth capacitor is connected with one end of the second inductor, the other end of the fourth capacitor is connected with one end of the fifth resistor and one end of the second diode, the other end of the fifth resistor is grounded, the other end of the second diode is connected with one end of the sixth resistor, the other end of the sixth resistor is connected with one end of the seventh resistor, one end of the fifth capacitor and the dry burning signal detection end, and the other end of the seventh resistor and the other end of the fifth capacitor are grounded. When no liquid is accumulated on the surface of the atomization plate, the mechanical vibration amplitude of the atomization plate is increased, a large amount of high-frequency voltage can be generated, the atomization plate is coupled with the fifth resistor through the fourth capacitor, the direct-current voltage formed by rectification, voltage division and filtering of the second diode, the sixth resistor and the seventh resistor is obviously increased, and the singlechip receives the signal and then judges that the atomization plate is lack of water and is dried.
As a further scheme, the connection end of the atomization piece is connected with the atomization piece, and the driving frequency of the atomization piece is 1.7MHZ, 2.4MHZ or 3.0 MHZ. Above-mentioned three kinds of atomizing piece drive frequency are conventional on the existing market, if there is other operating frequency's atomizing piece, the utility model discloses well atomizing piece drive circuit's theory of operation is also applicable equally.
The utility model has the advantages as follows:
(1) The atomization plate driving circuit judges the working frequency of the atomization plate by utilizing the minimum impedance and the maximum current of the atomization plate in the resonance state.
(2) The atomization sheet driving circuit changes the electric energy storage capacity of the first inductor by adjusting the width of the positive pulse, so that the voltage value of the second capacitor is changed, namely the driving voltage of the atomization sheet is changed to adjust the working power of the atomization sheet.
(3) The atomization plate driving circuit also has a function of dry burning prevention, when no liquid is accumulated on the surface of the atomization plate, the mechanical vibration amplitude of the atomization plate is increased, a large amount of high-frequency voltage can be generated, and the direct-current voltage formed by rectification, voltage division and filtering of the second diode, the sixth resistor and the seventh resistor is obviously increased through the coupling of the fourth capacitor and the fifth resistor, so that the dry burning caused by water shortage of the atomization plate is judged.
Drawings
fig. 1 is a circuit diagram according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
referring to fig. 1, an atomization plate driving circuit comprises a signal supply circuit, a booster circuit, a high-pass filter circuit, a single chip microcomputer U, a power sampling circuit and an anti-dry-burning circuit, wherein the signal supply circuit, the booster circuit, the high-pass filter circuit, the power sampling circuit and the anti-dry-burning circuit are electrically connected with each other, the signal supply circuit is provided with a switch signal input end PWM, the booster circuit is provided with a first power supply input end (24V direct current voltage), the high-pass filter circuit is provided with an atomization plate connecting end, the power sampling circuit is provided with a power sampling end ANP, the single chip microcomputer U is provided with a second power supply input end (5V direct current voltage), the switch signal input end PWM and the power sampling end ANP are respectively and electrically connected with the single chip microcomputer U, the anti-dry-burning circuit is provided with a dry. The atomizing piece connecting end is connected with atomizing piece HTD (ceramic atomizing piece), and atomizing piece HTD's drive frequency is 1.7MHZ, 2.4MHZ or 3.0 MHZ. The single chip microcomputer U is further provided with a ground wire.
The signal supply circuit comprises a first resistor R1, a first diode D1, a triode Q1 and a third resistor R3, wherein a switching signal input end PWM is connected with one end of a first diode D1 and the base electrode of a triode Q1 through the first resistor R1, the other end of the first diode D1 is connected with the collector electrode of the triode Q1, and the collector electrode and the emitter electrode of a triode Q1 are connected with the third resistor R3 in parallel.
The boost circuit comprises a first inductor L1, a field effect transistor MS1 and a second capacitor C2, wherein a first power supply input end is connected with a drain electrode of the field effect transistor MS1 and one end of a second capacitor C2 through the first inductor L1, the other end of the second capacitor C2 is grounded, and a control electrode and a source electrode of the field effect transistor MS1 are respectively connected with a collector electrode and an emitter electrode of a triode Q1.
The high-pass filter circuit comprises a second inductor L2 and a third capacitor C3, one end of the second inductor L2 is connected with one end of the second capacitor C2, the other end of the second inductor L2 is grounded through the third capacitor C3, and the connecting end of the third capacitor C3 is an atomization sheet connecting end.
The power sampling circuit comprises a fourth resistor R4, a second resistor R2 and a first capacitor C1, one end of the fourth resistor R4 is connected with an emitter of a triode Q1, and the other end of the fourth resistor R4 is grounded; one end of the second resistor R2 is connected with the emitter of the triode Q1, the other end of the second resistor R2 is connected with the power sampling end ANP and one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.
The dry burning prevention circuit comprises a fourth capacitor C4, a fifth resistor R5, a second diode D2, a sixth resistor R6, a seventh resistor R7 and a fifth capacitor C5, one end of the fourth capacitor C4 is connected with one end of a second inductor L2, the other end of the fourth capacitor C4 is connected with one end of a fifth resistor R5 and one end of a second diode D2, the other end of the fifth resistor R5 is grounded, the other end of the second diode D2 is connected with one end of a sixth resistor R6, the other end of the sixth resistor R6 is connected with one end of a seventh resistor R7, one end of a fifth capacitor C5 is connected with a dry burning signal detection end, and the other end of the seventh resistor R7 is grounded with the other end of the fifth capacitor C5.
The type of the single chip microcomputer U is sop14, the type of the triode Q1 is S8550, the types of the first diode D1 and the second diode D2 are both 4148, the working parameter of the first inductor L1 is 15 muH, the working parameter of the second inductor L2 is 0.6 muH, the types of the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are 105, 221, 102 and 105 respectively, the types of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 are 30R, 1K, 20K, 0R33, 20K, 680K and 20K respectively, and the type of the field effect transistor MS 67 1 is 1H15AF or NCE 5 011 0115 AK.
The working principle is as follows: and judging the working frequency of the atomizing plate by utilizing the minimum impedance of the atomizing plate in the resonance state and the maximum current flowing through the atomizing plate.
The ceramic atomization sheet applied to the humidifier and the incense machine currently has only three markets of 1.7MHZ, 2.4MHZ and 3.0 MHZ. The three frequencies are respectively used for driving the boosting circuit to drive the atomizing plate, and the frequency when the sampling circuit obtains the highest voltage value is the working frequency of the plate. The electric energy storage quantity of the first inductor is changed by adjusting the width of the positive pulse, so that the voltage value of the second capacitor is changed, namely the driving voltage of the atomizing plate is changed to adjust the working power of the atomizing plate.
Claims (8)
1. The utility model provides an atomizing piece drive circuit, includes signal supply circuit, boost circuit, high pass filter circuit and singlechip, its characterized in that: still include power sampling circuit, signal supply circuit, boost circuit, high pass filter circuit and the mutual electric connection of power sampling circuit, the signal supply circuit is equipped with switching signal input, boost circuit is equipped with first power input, high pass filter circuit is equipped with the atomizing piece link, power sampling circuit is equipped with power sample end, the singlechip is equipped with second power input, switching signal input and power sample end respectively with singlechip electric connection.
2. The atomization sheet driving circuit according to claim 1, wherein: the signal supply circuit comprises a first resistor, a first diode, a triode and a third resistor, wherein a switching signal input end is connected with one end of the first diode and a base electrode of the triode through the first resistor, the other end of the first diode is connected with a collector electrode of the triode, and the collector electrode and an emitter electrode of the triode are connected with the third resistor in parallel.
3. The atomization sheet driving circuit according to claim 2, wherein: the booster circuit comprises a first inductor, a field effect transistor and a second capacitor, wherein a first power input end is connected with a drain electrode of the field effect transistor and one end of the second capacitor through the first inductor, the other end of the second capacitor is grounded, and a control electrode and a source electrode of the field effect transistor are respectively connected with a collector electrode and an emitter electrode of the triode.
4. The atomization sheet driving circuit according to claim 3, wherein: the high-pass filter circuit comprises a second inductor and a third capacitor, one end of the second inductor is connected with one end of the second capacitor, the other end of the second inductor is grounded through the third capacitor, and the connecting end of the third capacitor is an atomization sheet connecting end.
5. The atomization sheet driving circuit according to claim 3, wherein: the power sampling circuit comprises a fourth resistor, a second resistor and a first capacitor, wherein one end of the fourth resistor is connected with an emitting electrode of the triode, and the other end of the fourth resistor is grounded; one end of the second resistor is connected with an emitting electrode of the triode, the other end of the second resistor is connected with the power sampling end and one end of the first capacitor, and the other end of the first capacitor is grounded.
6. The atomization sheet driving circuit according to claim 4, wherein: the dry-heating prevention circuit is electrically connected with the high-pass filter circuit and provided with a dry-heating signal detection end, and the dry-heating signal detection end is connected with the single chip microcomputer.
7. The atomization sheet driving circuit according to claim 6, wherein: the dry burning prevention circuit comprises a fourth capacitor, a fifth resistor, a second diode, a sixth resistor, a seventh resistor and a fifth capacitor, one end of the fourth capacitor is connected with one end of the second inductor, the other end of the fourth capacitor is connected with one end of the fifth resistor and one end of the second diode, the other end of the fifth resistor is grounded, the other end of the second diode is connected with one end of the sixth resistor, the other end of the sixth resistor is connected with one end of the seventh resistor, one end of the fifth capacitor and the dry burning signal detection end, and the other end of the seventh resistor and the other end of the fifth capacitor are grounded.
8. The atomization sheet driving circuit according to claim 1, wherein: the atomizing piece connecting end is connected with the atomizing piece, and the drive frequency of atomizing piece is 1.7MHZ, 2.4MHZ or 3.0 MHZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920926856.XU CN209787046U (en) | 2019-06-19 | 2019-06-19 | Atomization sheet drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920926856.XU CN209787046U (en) | 2019-06-19 | 2019-06-19 | Atomization sheet drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209787046U true CN209787046U (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920926856.XU Active CN209787046U (en) | 2019-06-19 | 2019-06-19 | Atomization sheet drive circuit |
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|---|---|
| CN (1) | CN209787046U (en) |
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2019
- 2019-06-19 CN CN201920926856.XU patent/CN209787046U/en active Active
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