CN202323454U - Initial frequency modulation circuit for water level sensor - Google Patents
Initial frequency modulation circuit for water level sensor Download PDFInfo
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- CN202323454U CN202323454U CN2011204482700U CN201120448270U CN202323454U CN 202323454 U CN202323454 U CN 202323454U CN 2011204482700 U CN2011204482700 U CN 2011204482700U CN 201120448270 U CN201120448270 U CN 201120448270U CN 202323454 U CN202323454 U CN 202323454U
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- circuit
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- electric capacity
- level sensor
- microswitch
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Abstract
The utility model relates to an initial frequency modulation circuit for a water level sensor. The initial frequency modulation circuit comprises an LC (Inductor-Capacitor) oscillation circuit which mainly comprises an inductor and capacitors. The initial frequency modulation circuit is characterized by further comprising a capacitive frequency-raising circuit, a frequency retaining circuit and a capacitive frequency-lowering circuit, wherein the capacitive frequency-raising circuit can be in disconnection or series connection with the inductor due to the connection of the two ends of the capacitive frequency-raising circuit, the frequency retaining circuit is in parallel connection with the capacitive frequency-raising circuit, and the capacitive frequency-lowering circuit can be in disconnection or parallel connection with an inductive branch due to the connection of the two ends of the capacitive frequency-lowering circuit. During modulation, the change of output frequency is achieved through connecting or disconnecting the capacitive frequency-raising circuit and the capacitive frequency-lowering circuit, and the number of the turns of a coil and the inductance value accuracy deviation and capacitance value accuracy deviation of a magnetic core, used for manufacturing the water level sensor, are not needed to be sorted in detail, the repeated matching is not needed, so that the production efficiency is greatly increased, the percent of pass of products is high, the corresponding requirements on the accuracy deviation of the magnetic core and the capacitors are lowered, and the manufacturing cost is lowered.
Description
Technical field
The utility model relates to a kind of level sensor, particularly a kind of level sensor circuit that is applied on the roller washing machine level measuring and has the scalable initial parameter.
Background technology
The level sensor that at present existing level sensor, particularly roller washing machine are used adopts the LC oscillating circuit usually, utilizes the change of the variation realization frequency of oscillation of inductance value in the LC oscillating circuit, and gives subsequent conditioning circuit with this frequency signal.Changing on the inductance value parameter, adopt the air film structure, principle is: when water level changed, the air film structure promoted magnetic core, made it and coil generation relative displacement, thereby changed inductance value.
In manufacture process, the level sensor original frequency must be controlled within the very little prescribed limit.Therefore before the level sensor assembling, need carry out sorting to magnetic core inductance value, capacitance, and mated times without number by manual work, make level sensor after assembling, obtain satisfactory original frequency, production efficiency is not high.Because the level sensor original frequency also receives influence of various factors such as cover plate, base, diaphragm, spring, coil outward appearance and assembling deformation, many product original frequencies are arranged still not in prescribed limit after the assembling, product percent of pass is low.In addition, components and parts required precisions such as the magnetic core of buying, electric capacity are increased thereupon, cause production cost high.
Summary of the invention
The technical problem that the utility model will solve provides a kind of level sensor circuit that is applied on the roller washing machine level measuring and has the scalable initial parameter.
For solving the problems of the technologies described above; The technical scheme of the utility model is: a kind of level sensor original frequency regulating circuit; Comprise the LC oscillating circuit of mainly forming by inductance, electric capacity; Its innovative point is also to comprise: an electric capacity raising frequency circuit, and this electric capacity raising frequency circuit can be in inductance and break off or the two kinds of duties of connecting; One frequency holding circuit, this frequency holding circuit are in electric capacity raising frequency circuit and break off or parallelly connected two kinds of duties; One electric capacity frequency down circuit, this electric capacity frequency down circuit can be in inductive branch and break off or parallelly connected two kinds of duties.
Further, said electric capacity raising frequency circuit comprises at least one road control capacittance branch road, and parallel connection is provided with between the control capacittance branch road more than two-way or the two-way, microswitch of every road control capacittance branch road serial connection.
Further, said microswitch is the circuit board Copper Foil of a pair of adjacent and not conducting, and this can realize conducting state through welding to lead.
Further, said frequency holding circuit is a microswitch, and said microswitch is the circuit board Copper Foil of a pair of adjacent and not conducting, and this can realize conducting state through welding to lead.
Further, said electric capacity frequency down circuit comprises at least one road control capacittance branch road, and parallel connection is provided with between the control capacittance branch road more than two-way or the two-way, microswitch of every road control capacittance branch road serial connection.
Further, said microswitch is the circuit board Copper Foil of a pair of adjacent and not conducting, and this can realize closed conducting through soldering to lead.
The operation principle of the utility model is: when initial frequency is higher;, simultaneously, that the one or more microswitches on the electric capacity frequency down circuit are closed through the frequency holding circuit with electric capacity raising frequency short circuit; Make the electric capacity frequency down circuit be parallel on the inductive branch, can reduce frequency of oscillation.Can original frequency be controlled within the scope of regulation through changing the parallelly connected quantity of control capacittance branch road in the electric capacity frequency down circuit.
Otherwise, when initial frequency is on the low side, break off the frequency holding circuit; One or more microswitches in the capacitive branch in the electric capacity raising frequency circuit are closed; Make electric capacity raising frequency circuit be connected in series on the inductance, can increase frequency of oscillation, same; Can original frequency be controlled within the scope of regulation through changing the parallelly connected quantity of control capacittance branch road in the electric capacity raising frequency circuit.
The advantage of the utility model is: utilize the regulatory function of level sensor regulating circuit to original frequency; Before the level sensor assembling, need not electric capacity, magnetic core that branch is selected to manufacturing, saved the coupling operation; Improved production efficiency greatly; Product percent of pass is high, and corresponding magnetic core, electric capacity accuracy error require to reduce, and have reduced manufacturing cost.
Description of drawings
Fig. 1 is the utility model level sensor original frequency regulating circuit schematic diagram.
Fig. 2 is the utility model middle water level sensor original frequency regulating circuit embodiment schematic diagram.
The specific embodiment
Embodiment one
Fig. 1 shows the utility model level sensor original frequency regulating circuit schematic diagram, the LC oscillating circuit that the LC oscillating circuit mainly is made up of inductance L, capacitor C 1, capacitor C 2, phase inverter 1, phase inverter 2.Also comprise the original frequency regulating circuit, the original frequency regulating circuit keeps branch road 3 to form by electric capacity raising frequency circuit 4, electric capacity frequency down circuit 5, frequency.
Electric capacity raising frequency circuit 4: this electric capacity raising frequency circuit 4 can be in inductance L and break off and the two kinds of duties of connecting.Electric capacity raising frequency circuit 4 comprises at least one road control capacittance branch road, and microswitch of every road control capacittance branch road serial connection adopts parallel connection setting between the control capacittance branch road more than two-way or the two-way.In the present embodiment, adopt two-way control capacittance branch road C3, C4, control capacittance branch road C3 goes up series connection microswitch S2, and control capacittance branch road C4 goes up series connection microswitch S3.
Frequency holding circuit 3: this frequency holding circuit 3 and electric capacity raising frequency circuit 4 are parallelly connected or break off two kinds of duties, and it is actual to be a microswitch S1.
Electric capacity frequency down circuit 5: this electric capacity frequency down circuit 5 can be in inductance L or inductive branch and break off and parallelly connected two states.Electric capacity frequency down circuit 5 comprises at least one road control capacittance branch road, and parallel connection is provided with between the control capacittance branch road more than two-way or the two-way, microswitch of every road control capacittance branch road serial connection.In the present embodiment, adopt two-way control capacittance branch road C5, C6, series connection microswitch S4 on the control capacittance C5 branch road, series connection microswitch S5 on the control capacittance C6 branch road.
For easy to connect; In the present embodiment; Microswitch S2, S3, S4, S5 and frequency holding circuit S1 are the circuit board Copper Foil of a pair of adjacent and not conducting, and this moment, microswitch was an off-state, and this can connect the closed conducting state of realization microswitch through soldering to lead.
Operation principle is: at first direct closed S1 records original frequency; When needing to reduce original frequency, the closed conducting of S1,4 short circuits of electric capacity raising frequency circuit are closed with one or two microswitch on the electric capacity frequency down circuit 3 simultaneously, make electric capacity frequency down circuit 3 be parallel on the inductance L and get final product.When needing the rising original frequency, break off S1, simultaneously that one or two microswitch on the electric capacity raising frequency circuit 4 is closed, make electric capacity raising frequency circuit 4 be connected in series on the inductance L and get final product.
When changing frequency reducing or raising frequency parameter, by the quantity of closed microswitch on electric capacity raising frequency circuit 4 or the electric capacity frequency down circuit 5 and corresponding control capacittance branch road capacity decision.
Embodiment two
In actual manufacture process, because the capacity of C3, C4 is bigger among Fig. 1, need select low-loss electric capacity for use, cost is higher., wire circle is reduced for this reason, make and regulate preceding original frequency, carry out so only need carrying out frequency reducing when original frequency is regulated all greater than the lower limit of the original frequency that requires.
Fig. 2 shows a kind of level sensor original frequency regulating circuit embodiment schematic diagram.
Electric capacity frequency down circuit 5, this electric capacity frequency down circuit 5 is in parallelly connected state with inductance L.Electric capacity frequency down circuit 5 comprises at least one road control capacittance branch road, and electric capacity is the parallel connection of three road capacitive branch, microswitch of every road capacitive branch serial connection.In this instance, adopt three road capacitive branch C5, C6, C7, microswitch S4 control capacitance C5, microswitch S5 control capacitance C6, microswitch S6 control capacitance C7.
The electric capacity quantity of embodiment two is reduced to 3 by 4 of embodiment one, has reduced production cost, makes large-scale production become reality.Simultaneously,, do not need at first closed S1, improved production efficiency owing to measure original frequency at the very start.
Claims (6)
1. a level sensor original frequency regulating circuit comprises the LC oscillating circuit of mainly being made up of inductance, electric capacity, it is characterized in that also comprising:
One electric capacity raising frequency circuit, this electric capacity raising frequency circuit can be in inductance and break off or the two kinds of duties of connecting;
One frequency holding circuit, this frequency holding circuit are in electric capacity raising frequency circuit and break off or parallelly connected two kinds of duties;
One electric capacity frequency down circuit, this electric capacity frequency down circuit can be in inductive branch and break off or parallelly connected two kinds of duties.
2. level sensor original frequency regulating circuit according to claim 1; It is characterized in that: said electric capacity raising frequency circuit comprises at least one road control capacittance branch road; Parallel connection is provided with between the control capacittance branch road more than two-way or the two-way, microswitch of every road control capacittance branch road serial connection.
3. level sensor original frequency regulating circuit according to claim 2 is characterized in that: said microswitch is the circuit board Copper Foil of a pair of adjacent and not conducting, and this can realize conducting state through welding to lead.
4. level sensor original frequency regulating circuit according to claim 1; It is characterized in that: said frequency holding circuit is a microswitch; Said microswitch is the circuit board Copper Foil of a pair of adjacent and not conducting, and this can realize conducting state through welding to lead.
5. level sensor original frequency regulating circuit according to claim 1; It is characterized in that: said electric capacity frequency down circuit comprises at least one road control capacittance branch road; Parallel connection is provided with between the control capacittance branch road more than two-way or the two-way, microswitch of every road control capacittance branch road serial connection.
6. level sensor original frequency regulating circuit according to claim 5 is characterized in that: said microswitch is the circuit board Copper Foil of a pair of adjacent and not conducting, and this can realize closed conducting through soldering to lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204482700U CN202323454U (en) | 2011-11-14 | 2011-11-14 | Initial frequency modulation circuit for water level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204482700U CN202323454U (en) | 2011-11-14 | 2011-11-14 | Initial frequency modulation circuit for water level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202323454U true CN202323454U (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204482700U Withdrawn - After Issue CN202323454U (en) | 2011-11-14 | 2011-11-14 | Initial frequency modulation circuit for water level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202323454U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493154A (en) * | 2011-11-14 | 2012-06-13 | 南通市华冠电器有限公司 | Initial frequency regulating circuit of water level sensor |
| CN102797134A (en) * | 2012-08-13 | 2012-11-28 | 常州大学 | Water level sensor initial frequency automatic adjusting method based on switched capacitor |
-
2011
- 2011-11-14 CN CN2011204482700U patent/CN202323454U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493154A (en) * | 2011-11-14 | 2012-06-13 | 南通市华冠电器有限公司 | Initial frequency regulating circuit of water level sensor |
| CN102797134A (en) * | 2012-08-13 | 2012-11-28 | 常州大学 | Water level sensor initial frequency automatic adjusting method based on switched capacitor |
| CN102797134B (en) * | 2012-08-13 | 2014-12-31 | 常州大学 | Water level sensor initial frequency automatic adjusting method based on switched capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20130710 |
|
| RGAV | Abandon patent right to avoid regrant |