CN202870147U - Non-isolated commercial power voltage detection circuit - Google Patents
Non-isolated commercial power voltage detection circuit Download PDFInfo
- Publication number
- CN202870147U CN202870147U CN 201220485257 CN201220485257U CN202870147U CN 202870147 U CN202870147 U CN 202870147U CN 201220485257 CN201220485257 CN 201220485257 CN 201220485257 U CN201220485257 U CN 201220485257U CN 202870147 U CN202870147 U CN 202870147U
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- circuit
- resistance
- divider resistance
- voltage
- isolated line
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- 238000001514 detection method Methods 0.000 title abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 13
- 238000005070 sampling Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Abstract
The utility model relates to a voltage detection circuit, and particularly relates to a non-isolated commercial power voltage detection circuit. The non-isolated commercial voltage detection circuit comprises a voltage division circuit, a sampling maintenance circuit and a filter output circuit which are sequentially connected. The non-isolated commercial power voltage detection circuit has the advantages of concise lines, low cost, and simple and convenient application.
Description
Technical field
The utility model relates to voltage detecting circuit, particularly a kind of non-isolated line voltage testing circuit.
Background technology
Development along with the electron electric power technology, the electrical equipment that more and more with high content of technology, intelligent degree is high, inner structure is complicated such as the household electrical appliance such as refrigerator, electric oven are used in daily life widely, and corresponding power technology also attains full development and widespread use.In the use procedure of electrical equipment, usually need the voltage of power supply source is detected to protect electrical appliance.Traditional supply voltage detection scheme is to adopt resistance that civil power is carried out the sinusoidal voltage that dividing potential drop and rectification obtain half-wave or all-wave, carries out voltage sample by MCU again.Prior art exists circuit too simple, and software is high to the AD sampling request, takies more software resource.
The utility model content
For above-mentioned problem, the utility model proposes simple, lower, non-isolated to the MCU sampling request line voltage testing circuit of a kind of line principle.
The technical solution adopted in the utility model is as follows:
A kind of non-isolated line voltage testing circuit comprises: bleeder circuit, sample-and-hold circuit, filtering output circuit, above-mentioned each circuit successively order connect.
Further, described bleeder circuit comprises: the first divider resistance R1, the second divider resistance R2, the 3rd divider resistance R3 and commutation diode D1, wherein, the first divider resistance R1 and the second divider resistance R2 series connection, the tested voltage of one termination, the other end accesses the input end of sample holding circuit and the end of the 3rd divider resistance R3, the other end ground connection of the 3rd divider resistance R3 by commutation diode D1.
Further, described sample-and-hold circuit comprises: triode Q1, storage capacitor C1 and voltage follow resistance R 4, wherein the base stage of triode Q1 connects an end of bleeder circuit output terminal and voltage follow resistance R 4, collector meets reference voltage V CC, emitter links to each other the other end ground connection of storage capacitor C1 with the end of voltage follow resistance R 4 other ends with filtering output circuit input end and storage capacitor C1.When the positive terminal voltage that is higher than storage capacitor C1 when the crest voltage of bleeder circuit adds the base stage of triode Q1 and emitter PN junction voltage, the forward conducting of the collector of triode Q1, emitter, storage capacitor C1 replenishes the electric weight boosted voltage by triode Q1 from reference voltage V CC, when the positive terminal that is lower than storage capacitor C1 when the voltage of bleeder circuit adds the base stage of triode Q1 and emitter PN junction voltage, storage capacitor C1 carries out energy by voltage follow resistance R 4, the 3rd divider resistance R3 and releases, and voltage slowly reduces.
Further, described filtering output circuit comprises: filter resistance R5, filter capacitor C2, the output terminal of the termination sample-and-hold circuit of filter resistance R5 wherein, the other end is by filter capacitor C2 ground connection, as non-isolated line voltage testing circuit output terminal.Filter resistance R5 and filter capacitor C2 consist of the high frequency clutter that the RC low-pass filter is used for the testing circuit output signal of filtering civil power.
The utility model adopts technique scheme, and the advantage that has is: simple in circuits, and with low cost, use convenient and simple.
Description of drawings
Fig. 1 is non-isolated line voltage testing circuit theory diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of the preferred embodiment of the non-isolated line voltage testing circuit of the utility model.
Embodiment
Now with embodiment the utility model is further specified by reference to the accompanying drawings.
Consult shown in Figure 1ly, a kind of non-isolated line voltage testing circuit comprises: bleeder circuit 101, sample-and-hold circuit 102, filtering output circuit 103, above-mentioned bleeder circuit 101, sample-and-hold circuit 102, filtering output circuit 103 successively order connect.
Consult shown in Figure 2, as a preferred embodiment, described bleeder circuit 101 is by the first divider resistance R1 and the second divider resistance R2, the 3rd divider resistance R3, commutation diode D1 is linked to be circuit network, wherein, the tested voltage of a termination after the first divider resistance R1 and the second divider resistance R2 series connection, the other end accesses the input end of sample holding circuit 102 and the end of the 3rd divider resistance R3 by commutation diode D1, the other end ground connection of the 3rd divider resistance R3, particularly, the first divider resistance R1 and the second divider resistance R2 value are 470k, the value of the 3rd divider resistance R3 is 12K, the model of commutation diode D1 is SM4007, then when tested voltage was 220VAC, the output terminal of bleeder circuit 101 was exported the half-wave DC sampled signal of the AC of 2.77V, and voltage peak is 2.77V*1.414=3.917V.
As a preferred embodiment, described sample-and-hold circuit 102 is linked to be circuit network by triode Q1, storage capacitor C1 and voltage follow resistance R 4, wherein the base stage of triode Q1 connects an end of bleeder circuit output terminal and voltage follow resistance R 4, collector meets reference voltage V CC, emitter links to each other the other end ground connection of storage capacitor C1 with the end of voltage follow resistance R 4 other ends with filtering output circuit input end and storage capacitor C1.Particularly, the model of triode Q1 is BC847B or other small-signal NPN triode, the capacitance of storage capacitor C1 is 1 μ F, the value of voltage follow resistance R 4 is 1M ohm, discharge time, coefficient was 1S, then the electric current of the base stage of triode Q1 control reference voltage V CC is through the unidirectional injection storage capacitor of triode Q1 C1, and the positive terminal voltage of storage capacitor C1 namely is to amplify holding signal voltage to deduct triode PN junction voltage.
As a preferred embodiment, described filtering output circuit 103 is RC filtering circuits that filter resistance R5 and filter capacitor C2 consist of, the output terminal of the termination sample-and-hold circuit 102 of filter resistance R5 wherein, the other end is by filter capacitor C2 ground connection, as overvoltage/undervoltage detection circuit output terminal, particularly, filter resistance R5 value 10K, filter capacitor C2 value 0.1UF is for the high frequency clutter of this non-isolated line voltage testing circuit output signal of filtering.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection domain of the present utility model.
Claims (4)
1. a non-isolated line voltage testing circuit comprises: the successively order connection of bleeder circuit, sample-and-hold circuit, filtering output circuit, above-mentioned each circuit.
2. a kind of non-isolated line voltage testing circuit as claimed in claim 1, it is characterized in that: described bleeder circuit comprises: the first divider resistance R1, the second divider resistance R2, the 3rd divider resistance R3 and commutation diode D1, wherein, the first divider resistance R1 and the second divider resistance R2 series connection, the tested voltage of one termination, the other end accesses the input end of sample holding circuit and the end of the 3rd divider resistance R3, the other end ground connection of the 3rd divider resistance R3 by commutation diode D1.
3. a kind of non-isolated line voltage testing circuit as claimed in claim 1, it is characterized in that: described sample-and-hold circuit comprises: triode Q1, storage capacitor C1 and voltage follow resistance R 4, wherein the base stage of triode Q1 connects an end of bleeder circuit output terminal and voltage follow resistance R 4, collector meets reference voltage V CC, emitter links to each other the other end ground connection of storage capacitor C1 with the end of voltage follow resistance R 4 other ends with filtering output circuit input end and storage capacitor C1.
4. a kind of non-isolated line voltage testing circuit as claimed in claim 1, it is characterized in that: described filtering output circuit comprises: filter resistance R5, filter capacitor C2, the output terminal of the termination sample-and-hold circuit of filter resistance R5 wherein, the other end is by filter capacitor C2 ground connection, as non-isolated line voltage testing circuit output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220485257 CN202870147U (en) | 2012-09-21 | 2012-09-21 | Non-isolated commercial power voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220485257 CN202870147U (en) | 2012-09-21 | 2012-09-21 | Non-isolated commercial power voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202870147U true CN202870147U (en) | 2013-04-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220485257 Expired - Lifetime CN202870147U (en) | 2012-09-21 | 2012-09-21 | Non-isolated commercial power voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202870147U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389248A (en) * | 2018-04-16 | 2019-10-29 | 广东美的生活电器制造有限公司 | A kind of ac voltage detection circuit, equipment, method and storage medium |
| CN110749770A (en) * | 2019-06-25 | 2020-02-04 | 深圳市聚芯影像有限公司 | Commercial power detection sampling circuit |
-
2012
- 2012-09-21 CN CN 201220485257 patent/CN202870147U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389248A (en) * | 2018-04-16 | 2019-10-29 | 广东美的生活电器制造有限公司 | A kind of ac voltage detection circuit, equipment, method and storage medium |
| CN110749770A (en) * | 2019-06-25 | 2020-02-04 | 深圳市聚芯影像有限公司 | Commercial power detection sampling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CP01 | Change in the name or title of a patent holder |
Address after: 361000 Fujian Province, Xiamen torch hi tech Industrial Development Zone Hualian electronic building Patentee after: XIAMEN HUALIAN ELECTRONICS Corp.,Ltd. Address before: 361000 Fujian Province, Xiamen torch hi tech Industrial Development Zone Hualian electronic building Patentee before: XIAMEN HUALIAN ELECTRONICS Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |