CN216350896U - Isolated voltage acquisition circuit - Google Patents
Isolated voltage acquisition circuit Download PDFInfo
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- CN216350896U CN216350896U CN202122373994.XU CN202122373994U CN216350896U CN 216350896 U CN216350896 U CN 216350896U CN 202122373994 U CN202122373994 U CN 202122373994U CN 216350896 U CN216350896 U CN 216350896U
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- 238000002955 isolation Methods 0.000 claims abstract description 67
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
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Abstract
The utility model discloses an isolation voltage acquisition circuit, which comprises a first input end, a second input end, a rectifier sub-circuit, a first current-limiting sub-circuit, a second current-limiting sub-circuit, an isolation optocoupler and a control module, wherein the first input end and the second input end are respectively used for accessing alternating current commercial power; the first input end, the rectifier sub-circuit, the first current-limiting sub-circuit and the anode of the diode of the isolation optocoupler are sequentially connected in series, the cathode of the diode of the isolation optocoupler is connected with the second input end, the collector of the triode of the isolation optocoupler is connected with direct-current voltage, the emitter of the triode of the isolation optocoupler is respectively connected with one end of the second current-limiting sub-circuit and the input end of the control module, and the other end of the second current-limiting sub-circuit is grounded; the isolation optocoupler is in a linear amplification state when electrified. The isolation voltage acquisition circuit outputs a voltage acquisition signal which changes along with the waveform change of the alternating current commercial power through the isolation optocoupler in a linear amplification state, so that the voltage signal acquisition of the alternating current commercial power is realized.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to an isolation voltage acquisition circuit.
Background
In the power electronics industry, the power of a load fluctuates according to voltage fluctuation, and in order to stabilize the power, the prior art adopts a method of outputting different control signals according to the level of collected input voltage so as to stabilize the power of the load. At present, non-isolated voltage acquisition can only be used on non-isolated electronic products, cannot be used on a product scheme needing isolation, voltage signals acquired by the non-isolated voltage cannot be directly used for an isolation chip, the acquired signals need to be indirectly used for the isolation chip by one non-isolated chip through optical coupling communication, and the material cost is high.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide an isolated voltage acquisition circuit to solve one or more of the problems of the prior art, and to provide at least one of the advantages of the isolated voltage acquisition circuit.
An isolation voltage acquisition circuit comprises a first input end, a second input end, a rectifier sub-circuit, a first current-limiting sub-circuit, a second current-limiting sub-circuit, an isolation optocoupler and a control module;
the first input end and the second input end are respectively used for accessing alternating current commercial power;
the first input end, the rectifier sub-circuit, the first current-limiting sub-circuit and the anode of the diode of the isolation optocoupler are sequentially connected in series, the cathode of the diode of the isolation optocoupler is connected with the second input end, the collector of the triode of the isolation optocoupler is connected with direct-current voltage, the emitter of the triode of the isolation optocoupler is respectively connected with one end of the second current-limiting sub-circuit and the input end of the control module, and the other end of the second current-limiting sub-circuit is grounded;
the input current and the output current of the isolation optocoupler meet Iin·CTR＜IoutWherein, IinIndicating the input current of the isolating optocoupler, IoutAnd the CTR represents the current transmission ratio of the isolation optocoupler.
Further, the rectifier sub-circuit comprises a rectifier diode, an anode of the rectifier diode is connected with the first input end, and a cathode of the rectifier diode is connected with the first current-limiting sub-circuit.
Furthermore, the first current-limiting sub-circuit comprises a first current-limiting resistor, one end of the first current-limiting resistor is connected with the rectifier sub-circuit, and the other end of the first current-limiting resistor is connected with the anode of the diode of the isolation optocoupler.
Furthermore, the second current limiting sub-circuit comprises a second current limiting resistor, one end of the second current limiting resistor is connected with an emitting electrode of a triode of the isolation optocoupler, and the other end of the second current limiting resistor is grounded.
Furthermore, the isolation voltage acquisition circuit further comprises a third current limiting sub-circuit, and an emitter of a triode of the isolation optocoupler is connected with the input end of the control module through the third current limiting sub-circuit.
Furthermore, the third current limiting sub-circuit comprises a third current limiting resistor, one end of the third current limiting resistor is connected with an emitter of a triode of the isolation optocoupler, and the other end of the third current limiting resistor is connected with the input end of the control module.
Further, the isolation optocoupler is a linear optocoupler.
Further, the isolation optocoupler is a PS2501-1 series linear optocoupler.
The utility model has the beneficial effects that: the isolation optocoupler is used for collecting voltage signals of alternating current mains supply, and the isolation optocoupler in a linear amplification state outputs voltage collecting signals which change along with the waveform change of the alternating current mains supply, so that the voltage signals of the alternating current mains supply can be collected, and the isolation optocoupler is suitable for being used in isolation electronic products to collect voltage.
Drawings
Fig. 1 is a block diagram of an isolated voltage acquisition circuit according to an embodiment.
Fig. 2 is a specific circuit structure diagram of the isolated voltage acquisition circuit provided in the embodiment of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention will be further described with reference to the embodiments and the accompanying drawings.
Fig. 1 is a block diagram of an isolated voltage acquisition circuit according to an embodiment.
Referring to fig. 1, the isolation voltage collecting circuit includes a first input terminal L, a second input terminal N, a rectifier sub-circuit 100, a first current-limiting sub-circuit 200, a second current-limiting sub-circuit 300, an isolation optocoupler 400 and a control module 500, where the first input terminal L and the second input terminal N are respectively used for accessing an ac mains supply, and the voltage signal of the ac mains supply is collected when a triode of the isolation optocoupler 400 is in a linear amplification state through the isolation property of the isolation optocoupler 400.
The specific connection structure of the isolation voltage acquisition circuit comprises: the first input end L, the rectifier sub-circuit 100, the first current-limiting sub-circuit 200 and the anode of the diode of the isolation optocoupler 400 are sequentially connected in series, the cathode of the diode of the isolation optocoupler 400 is connected with the second input end N, the collector of the triode of the isolation optocoupler 400 is connected with the direct current voltage Vcc, the emitter of the triode of the isolation optocoupler 400 is connected with one end of the second current-limiting sub-circuit 300 and the input end of the control module 500 respectively, and the other end of the second current-limiting sub-circuit 300 is grounded.
In order to make the triode of the isolation optocoupler 400 in a linear amplification state, the input current and the output current of the isolation optocoupler 400 satisfy the following relationship:
Iin·CTR＜Iout
wherein, IinRepresents the input current, I, of the isolating optocoupler 400outThe output current of the isolating optocoupler 400 is indicated, and CTR indicates the current transfer ratio of the isolating optocoupler 400.
Compared with the prior art, the voltage signal of alternating current mains supply is collected by the isolation optocoupler 400, the input current and the output current of the isolation optocoupler 400 meet the condition of a linear amplification state by adjusting the resistance value of the first current limiting sub-circuit 200 and the resistance value of the second current limiting sub-circuit 300, when the triode of the isolation optocoupler 400 is in the linear amplification state, the waveform of the output voltage of the isolation optocoupler 400 changes along with the waveform change of the alternating current mains supply, the output waveform of the isolation optocoupler 400 is sent to the control module 500, and the control module 500 records the voltage waveform, so that the voltage signal collection of the alternating current mains supply is realized.
Fig. 2 is a specific circuit structure diagram of the isolated voltage acquisition circuit provided in the embodiment of fig. 1.
Referring to fig. 2, a specific circuit structure of the isolated voltage acquisition circuit is explained below.
In the present embodiment, the rectifying sub-circuit 100 includes a rectifying diode D1, an anode of the rectifying diode D1 is connected to the first input terminal L, a cathode of the rectifying diode D1 is connected to the first current-limiting sub-circuit 200, and the rectifying diode D1 is used for enhancing the dc signal and reducing the ac interference.
In this embodiment, the first current limiting sub-circuit 200 includes a first current limiting resistor R1, one end of the first current limiting resistor R1 is connected to the rectifier sub-circuit 100, the other end of the first current limiting resistor R1 is connected to the anode of the diode of the isolation optocoupler 400, and the input voltage of the isolation optocoupler 400 can be adjusted by changing the resistance of the first current limiting resistor R1.
In this embodiment, the second current limiting sub-circuit 300 includes a second current limiting resistor D2, one end of the second current limiting resistor D2 is connected to the emitter of the transistor of the isolation optocoupler 400, the other end of the second current limiting resistor D2 is grounded, and the output voltage of the isolation optocoupler 400 can be adjusted by changing the resistance of the second current limiting resistor D2.
In this embodiment, the isolation voltage collecting circuit further includes a third current limiting sub-circuit 600, an emitter of a triode of the isolation optocoupler 400 is connected to the input terminal of the control module 500 through the third current limiting sub-circuit 600, and the third current limiting sub-circuit 600 is used for protecting the input terminal of the control module 500; the third current limiting sub-circuit 600 includes a third current limiting resistor R3, one end of the third current limiting resistor R3 is connected to an emitter of a transistor of the isolation optocoupler 400, and the other end of the third current limiting resistor R3 is connected to an input end of the control module 500.
In this embodiment, the isolation optocoupler 400 is a linear optocoupler, thereby protecting the entire acquisition circuit structure and reducing the influence of environmental interference on the acquisition circuit. More specifically, the isolating optocoupler 400 is a PS2501-1 series linear optocoupler.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. An isolation voltage acquisition circuit is characterized by comprising a first input end, a second input end, a rectifier sub-circuit, a first current-limiting sub-circuit, a second current-limiting sub-circuit, an isolation optocoupler and a control module;
the first input end and the second input end are respectively used for accessing alternating current commercial power;
the first input end, the rectifier sub-circuit, the first current-limiting sub-circuit and the anode of the diode of the isolation optocoupler are sequentially connected in series, the cathode of the diode of the isolation optocoupler is connected with the second input end, the collector of the triode of the isolation optocoupler is connected with direct-current voltage, the emitter of the triode of the isolation optocoupler is respectively connected with one end of the second current-limiting sub-circuit and the input end of the control module, and the other end of the second current-limiting sub-circuit is grounded;
the input current and the output current of the isolation optocoupler meet Iin·CTR＜IoutWherein, IinShowing partitionInput current of the optocoupler, IoutAnd the CTR represents the current transmission ratio of the isolation optocoupler.
2. The isolated voltage acquisition circuit of claim 1 wherein the rectifying sub-circuit comprises a rectifying diode, an anode of the rectifying diode is connected to the first input terminal, and a cathode of the rectifying diode is connected to the first current limiting sub-circuit.
3. The isolated voltage acquisition circuit of claim 1, wherein the first current limiting sub-circuit comprises a first current limiting resistor, one end of the first current limiting resistor is connected to the rectifier sub-circuit, and the other end of the first current limiting resistor is connected to an anode of a diode of the isolated optocoupler.
4. The isolated voltage acquisition circuit of claim 1, wherein the second current limiting sub-circuit comprises a second current limiting resistor, one end of the second current limiting resistor is connected to an emitter of a triode of the isolated optocoupler, and the other end of the second current limiting resistor is grounded.
5. The isolated voltage acquisition circuit of claim 1, further comprising a third current limiting sub-circuit, wherein an emitter of the transistor of the isolation optocoupler is connected to the input of the control module via the third current limiting sub-circuit.
6. The isolated voltage acquisition circuit of claim 5, wherein the third current limiting sub-circuit comprises a third current limiting resistor, one end of the third current limiting resistor is connected to an emitter of a triode of the isolated optocoupler, and the other end of the third current limiting resistor is connected to an input terminal of the control module.
7. The isolated voltage acquisition circuit according to any one of claims 1-6, wherein the isolation optocoupler is a linear optocoupler.
8. The isolated voltage acquisition circuit according to claim 7, wherein the isolated optocoupler is a PS2501-1 series linear optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122373994.XU CN216350896U (en) | 2021-09-28 | 2021-09-28 | Isolated voltage acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122373994.XU CN216350896U (en) | 2021-09-28 | 2021-09-28 | Isolated voltage acquisition circuit |
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| CN216350896U true CN216350896U (en) | 2022-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966187A (en) * | 2022-07-27 | 2022-08-30 | 华录易云科技有限公司 | Commercial power voltage monitoring circuit and method and application in traffic signal machine |
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2021
- 2021-09-28 CN CN202122373994.XU patent/CN216350896U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966187A (en) * | 2022-07-27 | 2022-08-30 | 华录易云科技有限公司 | Commercial power voltage monitoring circuit and method and application in traffic signal machine |
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Effective date of registration: 20240110 Address after: 528300, Building 1, No. 33 Shunye East Road, High tech Zone, Shunde District, Foshan City, Guangdong Province, China (Address Declaration) Patentee after: Xinhuike Electrical Appliances Group (Guangdong) Co.,Ltd. Address before: 518107 xinhuike office building, 2045 sightseeing Road, Baihua community, Guangming Street, Guangming District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN CHK Co.,Ltd. |
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