CN109725190B - Alternating current-direct current signal multiple sampling protection system - Google Patents
Alternating current-direct current signal multiple sampling protection system Download PDFInfo
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Abstract
The invention provides an AC/DC signal multi-sampling protection system; the device comprises a signal processing circuit, a direct current sampling filter circuit, an alternating current filtering sampling circuit, an alternating current and direct current fault detection circuit, an alternating current hysteresis protection circuit, an alternating current positive and negative peak value protection circuit, a direct current hysteresis protection circuit and a vertical isolation circuit, wherein any path of alternating current signal amplitude of the device generates a positive over-current signal when exceeding a positive upper threshold value, and cancels the positive over-current signal when being smaller than a positive lower threshold value; when the amplitude of any path of alternating current signal exceeds a negative upper threshold value, a negative over-current signal is generated, and when the amplitude of any path of alternating current signal is smaller than a positive lower threshold value, the negative over-current signal is cancelled; the over current signal is active low. The positive overcurrent signal and the negative overcurrent signal of each path generate the overcurrent signal of the current path of alternating current signal through logical AND operation.
Description
Technical Field
The invention relates to an alternating current-direct current signal multi-sampling protection system.
Background
Because the control field often relates to sampling filtering, AD conversion, fault detection and overcurrent protection of various alternating current signals and direct current signals, in order to realize function integration, the electromagnetic compatibility design is considered, isolation is formed between the control device and the circuit, function expansion is realized through generalization and modular design, the functional circuit is integrated and designed, an alternating current-direct current signal multi-sampling protection module is formed, and a modular product with independent functions and control interconnection is realized.
Disclosure of Invention
In order to solve the technical problem, the invention provides an alternating current-direct current signal multi-sampling protection system.
The invention is realized by the following technical scheme.
The invention provides an AC/DC signal multi-sampling protection system; the direct current signal sampling circuit samples a direct current bus, the alternating current circuit samples three-phase lines of the three-phase lines, the direct current hysteresis protection circuit and the alternating current hysteresis protection circuit perform overcurrent protection on positive and negative peak hysteresis signals of a limit number, and the signal processing circuit receives overcurrent signals of the direct current filtering sampling circuit and the alternating current filtering sampling circuit and controls a light emitting diode.
The alternating current filtering and sampling circuit sequentially performs resistance sampling, pi-type filtering and signal proportion amplification on three alternating current signals, processes the signals and sends the alternating current signals to the input end of the signal processing circuit.
The alternating current positive and negative peak value protection setting circuit is provided with an adjustable alternating current signal amplitude protection value +/-Vamax. And +/-Vamax is respectively used as the positive input of the positive/negative peak hysteresis protection circuit, and the three-path conditioned alternating current input signals are used as the negative input of the positive/negative peak hysteresis protection circuit.
And a negative electrode of the direct current hysteresis protection circuit inputs the direct current signal processed by the direct current sampling circuit to generate a direct current signal hysteresis protection effect.
The three paths of current passing signals and one path of direct current over-current signals processed by the direct current filtering sampling circuit and the alternating current filtering sampling circuit are kept by a D trigger, the low level of the over-current signals is effectively converted into the high level of the over-current signals by an optical coupler, and the four paths of over-current signals are subjected to logic or to generate final over-current signals and are sent to a signal processing circuit.
The invention has the beneficial effects that: when the amplitude of any path of alternating current signal exceeds a positive upper threshold value, a positive over-current signal is generated, and when the amplitude of any path of alternating current signal is smaller than a positive lower threshold value, the positive over-current signal is cancelled; when the amplitude of any path of alternating current signal exceeds a negative upper threshold value, a negative over-current signal is generated, and when the amplitude of any path of alternating current signal is smaller than a positive lower threshold value, the negative over-current signal is cancelled; the over current signal is active low. The positive overcurrent signal and the negative overcurrent signal of each path generate the overcurrent signal of the current path of alternating current signal through logical AND operation.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph of the peak over-current protection effect of the present invention;
FIG. 3 is a diagram illustrating the hysteresis protection effect of the DC signal according to the present invention;
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A kind of alternating current-direct current signal multiple sampling protection system; the direct current signal sampling circuit samples a direct current bus, the alternating current circuit samples three-phase lines of the three-phase lines, the direct current hysteresis protection circuit and the alternating current hysteresis protection circuit perform overcurrent protection on positive and negative peak hysteresis signals of a limit number, and the signal processing circuit receives overcurrent signals of the direct current filtering sampling circuit and the alternating current filtering sampling circuit and controls a light emitting diode.
The alternating current filtering and sampling circuit sequentially performs resistance sampling, pi-type filtering and signal proportion amplification on three alternating current signals, processes the signals and sends the alternating current signals to the input end of the signal processing circuit.
The alternating current positive and negative peak value protection setting circuit is provided with an adjustable alternating current signal amplitude protection value +/-Vamax. And +/-Vamax is respectively used as the positive input of the positive/negative peak hysteresis protection circuit, and the three-path conditioned alternating current input signals are used as the negative input of the positive/negative peak hysteresis protection circuit.
And a negative electrode of the direct current hysteresis protection circuit inputs the direct current signal processed by the direct current sampling circuit to generate a direct current signal hysteresis protection effect.
The three paths of current passing signals and one path of direct current over-current signals processed by the direct current filtering sampling circuit and the alternating current filtering sampling circuit are kept by a D trigger, the low level of the over-current signals is effectively converted into the high level of the over-current signals by an optical coupler, and the four paths of over-current signals are subjected to logic or to generate final over-current signals and are sent to a signal processing circuit.
The alternating current-direct current signal multi-sampling circuit is printed on the printed board, an external interface connector of the printed board can be directly plugged on the control printed board, and can also be fastened with a control equipment terminal through a screw fixing connecting hole by a screw, so that parasitic parameters are reduced.
The invention can realize function debugging through an external connection +/-15V power module; the multi-channel alternating current and direct current signal sampling multi-protection circuit can be realized by overlapping and expanding the external interface connector layer by layer, the hysteresis width and the hysteresis threshold of the hysteresis protection circuit are adjustable, and the transportability is high.
The working principle of the invention is as follows: AD sampling: three AC signals with the voltage of less than 10V are subjected to signal processing through an AC signal sampling filter circuit (resistance sampling, pi-type filtering and proportional amplification); the two paths of direct current signals are subjected to signal processing through the direct current signal sampling filter circuit, the processed alternating current signals and the processed direct current signals are sent to a sampling input end of the AD7616 chip, and serial AD sampling is carried out on the five paths of signals by controlling a control port of the AD7616 chip (connected to control equipment through an external connection interface).
Multiple protection: the multiple protection comprises alternating current signal positive and negative peak value hysteresis overcurrent protection, direct current signal peak value overcurrent protection and alternating current and direct current overcurrent signal logic control triple overcurrent protection.
The AC positive and negative peak value protection setting circuit sets an adjustable AC signal amplitude protection value +/-Vamax. And +/-Vamax is respectively used as the positive input of the positive/negative peak hysteresis protection circuit, and the three-path conditioned alternating current input signals are used as the negative input of the positive/negative peak hysteresis protection circuit, so that the peak overcurrent protection effect shown in fig. 2 is generated.
When the amplitude of any path of alternating current signal exceeds a positive upper threshold value, generating a positive over-current signal, and when the amplitude of any path of alternating current signal is smaller than a positive lower threshold value, cancelling the positive over-current signal; when the amplitude of any path of alternating current signal exceeds a negative upper threshold value, a negative over-current signal is generated, and when the amplitude of any path of alternating current signal is smaller than a positive lower threshold value, the negative over-current signal is cancelled; the over current signal is active low. The positive overcurrent signal and the negative overcurrent signal of each path generate the overcurrent signal of the current path of alternating current signal through logical AND operation.
The direct current signal is used as the negative pole input of the direct current hysteresis protection circuit after signal processing, the direct current overcurrent protection amplitude can be adjusted through a potentiometer (larger than the alternating current signal peak value) and used as the positive pole input, and the direct current signal hysteresis protection effect is generated. The DC over-current signal and the AC over-current signal divide the over-current signal into three segments, as shown in FIG. 3.
The three paths of alternating current over-current signals and one path of direct current over-current signals are kept through the D trigger, are connected with the light emitting diode (when an over-current fault occurs, the diode is lightened), are effectively converted into high level effective from low level through the optocoupler HCPL2630, and are sent to the control equipment through logic or final over-current signals generated by the four paths of over-current signals (high level effective).
And (3) fault detection: the control equipment can perform further control operation after receiving the over-current signal, and can determine which signal is over-current by judging the light-emitting diode, so that the fault position can be detected and positioned.
Claims (5)
1. The utility model provides an alternating current-direct current signal multiple sampling protection system which characterized in that: the direct current sampling filter circuit samples a direct current bus, the alternating current filtering filter circuit samples three-phase lines of the three-phase lines, the direct current filtering filter circuit and the alternating current delaying protection circuit perform overcurrent protection on positive and negative peak delayed signals of the signals, and the signal processing circuit receives overcurrent signals of the direct current sampling filter circuit and the alternating current filtering filter circuit and controls a light emitting diode.
2. The ac-dc signal multi-sampling protection system of claim 1, wherein: the alternating current filtering and sampling circuit sequentially performs resistance sampling, pi-type filtering and signal proportion amplification on three alternating current signals, processes the signals and sends the alternating current signals to the input end of the signal processing circuit.
3. The ac-dc signal multi-sampling protection system of claim 1, wherein: the alternating current positive and negative peak value protection circuit is provided with adjustable alternating current signal amplitude protection values +/-Vamax, wherein the +/-Vamax is respectively used as the positive input of the alternating current hysteresis protection circuit, and three regulated alternating current input signals are used as the negative input of the alternating current hysteresis protection circuit.
4. The ac-dc signal multi-sampling protection system of claim 1, wherein: the negative pole of the direct current hysteresis protection circuit inputs the direct current signal processed by the direct current sampling filter circuit to generate the direct current signal hysteresis protection effect.
5. The ac-dc signal multi-sampling protection system of claim 1, wherein: the three paths of alternating current over-current signals and one path of direct current over-current signals processed by the direct current sampling filter circuit and the alternating current sampling circuit are kept by the D trigger, the low level of the over-current signals is effectively converted into the high level by the optical coupler, and the four paths of over-current signals are subjected to logic or to generate final over-current signals and are sent to the signal processing circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811406878.XA CN109725190B (en) | 2019-03-25 | 2019-03-25 | Alternating current-direct current signal multiple sampling protection system |
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| CN201811406878.XA CN109725190B (en) | 2019-03-25 | 2019-03-25 | Alternating current-direct current signal multiple sampling protection system |
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| CN109725190A CN109725190A (en) | 2019-05-07 |
| CN109725190B true CN109725190B (en) | 2020-11-03 |
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| CN112653084A (en) * | 2020-12-11 | 2021-04-13 | 天津航空机电有限公司 | Alternating current overcurrent rapid protection circuit and method based on three-phase load |
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| US20100302698A1 (en) * | 2009-05-29 | 2010-12-02 | Sanyo Electric Co., Ltd. | Overcurrent protection circuit and method of protecting power supply circuit |
| CN203191436U (en) * | 2013-01-05 | 2013-09-11 | 北京科诺伟业科技有限公司 | Over-current detection circuit applied on wind power generation current transformer |
| CN103336165A (en) * | 2013-06-25 | 2013-10-02 | 西安电子科技大学 | Detection circuit for overcurrent of alternating current and direct current |
| CN204794004U (en) * | 2015-05-28 | 2015-11-18 | 海特尔机电工程技术（马鞍山）有限公司 | Inductive current current foldback circuit among SVG |
| CN106532626A (en) * | 2016-12-09 | 2017-03-22 | 大禹电气科技股份有限公司 | Instantaneous overcurrent protection circuit of medium-high voltage variable-frequency speed regulating device and frequency converter |
| CN206349739U (en) * | 2016-12-26 | 2017-07-21 | 合肥工大高科信息科技股份有限公司 | A kind of tandem alternating current-direct current short-circuit protection circuit |
| CN107342579A (en) * | 2017-07-12 | 2017-11-10 | 山东建筑大学 | AC/DC overcurrent protection and self-hold circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013099202A (en) * | 2011-11-04 | 2013-05-20 | Honda Motor Co Ltd | Overcurrent interruption control circuit |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100302698A1 (en) * | 2009-05-29 | 2010-12-02 | Sanyo Electric Co., Ltd. | Overcurrent protection circuit and method of protecting power supply circuit |
| CN203191436U (en) * | 2013-01-05 | 2013-09-11 | 北京科诺伟业科技有限公司 | Over-current detection circuit applied on wind power generation current transformer |
| CN103336165A (en) * | 2013-06-25 | 2013-10-02 | 西安电子科技大学 | Detection circuit for overcurrent of alternating current and direct current |
| CN204794004U (en) * | 2015-05-28 | 2015-11-18 | 海特尔机电工程技术（马鞍山）有限公司 | Inductive current current foldback circuit among SVG |
| CN106532626A (en) * | 2016-12-09 | 2017-03-22 | 大禹电气科技股份有限公司 | Instantaneous overcurrent protection circuit of medium-high voltage variable-frequency speed regulating device and frequency converter |
| CN206349739U (en) * | 2016-12-26 | 2017-07-21 | 合肥工大高科信息科技股份有限公司 | A kind of tandem alternating current-direct current short-circuit protection circuit |
| CN107342579A (en) * | 2017-07-12 | 2017-11-10 | 山东建筑大学 | AC/DC overcurrent protection and self-hold circuit |
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