CN202870147U - Non-isolated commercial power voltage detection circuit - Google Patents

Non-isolated commercial power voltage detection circuit Download PDF

Info

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
Authority
CN
China
Prior art keywords
circuit
resistance
divider resistance
voltage
isolated line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN 201220485257
Other languages
Chinese (zh)
Inventor
吴文勇
许荣再
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Hualian Electronics Co Ltd
Original Assignee
Xiamen Hualian Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiamen Hualian Electronics Co Ltd filed Critical Xiamen Hualian Electronics Co Ltd
Priority to CN 201220485257 priority Critical patent/CN202870147U/en
Application granted granted Critical
Publication of CN202870147U publication Critical patent/CN202870147U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

A kind of non-isolated line voltage testing circuit
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.
CN 201220485257 2012-09-21 2012-09-21 Non-isolated commercial power voltage detection circuit Expired - Lifetime CN202870147U (en)

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

ID=48036856

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN103424606B (en) A kind of low voltage electric power carrier communication zero cross detection circuit of frequency self-adaption
CN202583311U (en) Alternating current zero-crossing detection circuit
CN203658449U (en) Zero-cross detection circuit and electric pressure cooker with application of same
CN203204062U (en) Comparator-based voltage signal detection circuit
CN102801137B (en) A kind of LED short-circuit protection circuit and light fixture
CN202870147U (en) Non-isolated commercial power voltage detection circuit
CN201955387U (en) Zero-crossing detecting circuit with low power consumption for carrier wave communication
CN202548267U (en) Circuit for detecting live wire and zero wire
CN204556715U (en) A kind of zero cross detection circuit and convertible frequency air-conditioner
CN203164279U (en) Commercial power zero-crossing signal detection circuit
CN102435828B (en) Isolated type circuit-voltage zero-crossing detecting circuit
CN103389401B (en) A kind of electric network voltage detection device
CN201765270U (en) Zero-crossing detection circuit of electric meter system
CN203225668U (en) Circuit for converting sinusoidal alternating current electric signal into sawtooth wave electric signal
CN204681087U (en) Solar charging device anti-surge circuit
CN202710648U (en) Grid voltage zero-crossing detection circuit
CN203119855U (en) Zero-crossing trigger circuit
CN203504786U (en) Electromagnetic heating control circuit and electric pressure cooker
CN203251234U (en) Switch power supply voltage stabilizing circuit
CN204559106U (en) A kind of convertible frequency air-conditioner and electrolytic capacitor overvoltage crowbar thereof
CN202888807U (en) Overcurrent protection circuit and switch power supply for half-bridge circuit
CN102385000B (en) Zero crossing detection circuit of electric meter system
CN201773146U (en) Mains supply zero cross detection circuit
CN203376389U (en) Frequency-adaptive low-voltage power carrier communication zero-crossing detection circuit
CN204405765U (en) A kind of arrester on-line monitoring system

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