CN203479883U - Reference voltage pull-type signal acquisition circuit of electrical fire monitoring detector - Google Patents
Reference voltage pull-type signal acquisition circuit of electrical fire monitoring detector Download PDFInfo
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- CN203479883U CN203479883U CN201320643876.9U CN201320643876U CN203479883U CN 203479883 U CN203479883 U CN 203479883U CN 201320643876 U CN201320643876 U CN 201320643876U CN 203479883 U CN203479883 U CN 203479883U
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- 238000012544 monitoring process Methods 0.000 title abstract description 4
- 238000005070 sampling Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Abstract
The utility model provides a reference voltage pull-type signal acquisition circuit of an electrical fire monitoring detector. A voltage follower circuit and a proportional amplifying circuit are sequentially arranged between a signal collection terminal and a processor input end; and a voltage follower circuit is provided for an additional direct current power supply which is used to integrally lift a to-be-acquired signal waveform to above a zero potential. The beneficial effects of the utility model are that: by lifting the reference voltage, the complete period waveform of the to-be-acquired signal is acquired, and the accurate result is realized; and the sensitivity and accuracy of the electrical fire monitoring detector are improved.
Description
Technical field
The utility model relates to electric fire disaster monitoring technical field, is specifically related to pull-up signal acquisition circuit on a kind of detector for electric fire protection reference voltage.
Background technology
Detector for electric fire protection reaches warning object by detecting residual current, and in circuit, the residual circuit of indication claims again Leakage Current.Finger is executed in alive situation in nothing; between the electric middle metal parts with mutually insulated; or between band electrical accessory and ground connection part; by surrounding medium or the formed electric current of insulating surface, be called leakage current, must adopt and monitor and protect the device of action to carry out to residual current.When the earth-fault current in protected circuit surpasses the preset value of detector; confirm by analysis; send sound, visual alarm and control signal; earth fault signal is passed to main control computer by CAN bus within the several seconds simultaneously; main control computer sends sound, visual alarm and control signal; display screen display alarm address, records and preserves and report to the police and control information, and operator on duty can take remote-controlled operation cut-out power supply or the scene of sending someone to get rid of at master station.
Existing signal acquisition circuit directly show that detection signal waveform comprises positive half cycle and negative half period, and processor (generally adopting single-chip microcomputer) can only be processed signal more than zero potential conventionally, if reference voltage (zero potential) is not pulled to the sine wave of 1.65V benchmark, cannot sample the so negative half-wave of sine wave, cannot reduce the truth of waveform, more cannot calculate its exact value, detect poor effect.
Summary of the invention
The problems referred to above that the utility model exists for prior art, provide pull-up signal acquisition circuit on a kind of detector for electric fire protection reference voltage.
For achieving the above object, the utility model is by the following technical solutions:
Pull-up signal acquisition circuit on detector for electric fire protection reference voltage, between signals collecting end and processor input end, be disposed with voltage follower circuit and ratio amplifying circuit, voltage follower circuit is provided with for signal waveform integral body to be collected being raised to the additional dc power supply of zero potential top.
Further, described voltage follower circuit comprises the first amplifier (U1A), the first amplifier (U1A) inverting input is connected with output terminal, the first amplifier (U1A) in-phase input end is connected with signals collecting end, and the first amplifier (U1A) in-phase input end is also by sampling resistor (R4) and the 4th electric capacity (C4) ground connection (GND); Ratio amplifying circuit comprises sampling resistor (R2), the second amplifier (U1D) and the first resistance (R1), sampling resistor (R2) one end other end that is connected with the first amplifier (U1A) input end is connected with the second amplifier (U1D) inverting input, the first resistance (R1) is connected between the second amplifier (U1D) inverting input and output terminal and is parallel with filter capacitor (C1), and the second amplifier (U1D) in-phase input end is connected and is connected with additional dc power supply with the intermediate node between the 4th electric capacity (C4) with sampling resistor (R4).
Further, between described the first resistance (R1) and the second amplifier (U1D) output terminal, be also in series with regulating resistance (VR1).
Further, described the second amplifier (U1D) output terminal is connected with processor input end by the 3rd resistance (R3).
Further, described the second amplifier (U1D) output terminal is also by a voltage stabilizing diode (Z1) ground connection (GND).
Further, described additional dc power supply magnitude of voltage is 1.65V.
The beneficial effects of the utility model are: by lifting reference voltage, obtain the complete period waveform of signal to be collected, result of calculation is accurate, improve detector for electric fire protection sensitivity and degree of accuracy.
Accompanying drawing explanation
Fig. 1 is the utility model circuit diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Shown in Fig. 1, pull-up signal acquisition circuit on detector for electric fire protection reference voltage of the present utility model, between signals collecting end and processor input end, be disposed with voltage follower circuit and ratio amplifying circuit, voltage follower circuit is provided with for signal waveform integral body to be collected being raised to the additional dc power supply of zero potential top.
In the present embodiment, described voltage follower circuit comprises the first amplifier U1A, the first amplifier U1A inverting input is connected with output terminal, the first amplifier U1A in-phase input end is connected with signals collecting end, and the first amplifier U1A in-phase input end is also by sampling resistor (R4) and the 4th capacitor C 4 ground connection GND; Ratio amplifying circuit comprises sampling resistor R2, the second amplifier U1D and the first resistance R 1, sampling resistor R2 one end other end that is connected with the first amplifier U1A input end is connected with the second amplifier U1D inverting input, the first resistance R 1 is connected between the second amplifier U1D inverting input and output terminal and is parallel with filter capacitor C1, and the second amplifier U1D in-phase input end is connected and is connected with additional dc power supply with the intermediate node between the 4th capacitor C 4 with sampling resistor R4.The model that in the present embodiment, the first amplifier and the second amplifier adopt is LM2902D.
For improving versatility, between described the first resistance R 1 and the second amplifier U1D output terminal, be also in series with regulating resistance VR1, range of applicability is wide.
The second amplifier U1D output terminal is also connected with processor input end by the 3rd resistance R 3.
For further improving the stability of collection signal, prevent undesired signal break treat with device input port, described the second amplifier U1D output terminal is also by a voltage stabilizing diode Z1 ground connection GND.In the present embodiment, additional dc power supply magnitude of voltage is 1.65V.
Although the utility model illustrates and describes by reference to preferred embodiment, but those of ordinary skills should understand, can be not limited to the description of above-described embodiment, in the scope of claims, can do the various variations in form and details.
Claims (6)
1. pull-up signal acquisition circuit on detector for electric fire protection reference voltage, it is characterized in that: between signals collecting end and processor input end, be disposed with voltage follower circuit and ratio amplifying circuit, voltage follower circuit is provided with for signal waveform integral body to be collected being raised to the additional dc power supply of zero potential top.
2. pull-up signal acquisition circuit on detector for electric fire protection reference voltage according to claim 1, it is characterized in that: described voltage follower circuit comprises the first amplifier (U1A), the first amplifier (U1A) inverting input is connected with output terminal, the first amplifier (U1A) in-phase input end is connected with signals collecting end, and the first amplifier (U1A) in-phase input end is also by sampling resistor (R4) and the 4th electric capacity (C4) ground connection (GND); Ratio amplifying circuit comprises sampling resistor (R2), the second amplifier (U1D) and the first resistance (R1), sampling resistor (R2) one end other end that is connected with the first amplifier (U1A) input end is connected with the second amplifier (U1D) inverting input, the first resistance (R1) is connected between the second amplifier (U1D) inverting input and output terminal and is parallel with filter capacitor (C1), and the second amplifier (U1D) in-phase input end is connected and is connected with additional dc power supply with the intermediate node between the 4th electric capacity (C4) with sampling resistor (R4).
3. pull-up signal acquisition circuit on detector for electric fire protection reference voltage according to claim 2, is characterized in that: between described the first resistance (R1) and the second amplifier (U1D) output terminal, be also in series with regulating resistance (VR1).
4. pull-up signal acquisition circuit on detector for electric fire protection reference voltage according to claim 2, is characterized in that: described the second amplifier (U1D) output terminal is connected with processor input end by the 3rd resistance (R3).
5. pull-up signal acquisition circuit on detector for electric fire protection reference voltage according to claim 4, is characterized in that: described the second amplifier (U1D) output terminal is also by a voltage stabilizing diode (Z1) ground connection (GND).
6. pull-up signal acquisition circuit on detector for electric fire protection reference voltage according to claim 4, is characterized in that: described additional dc power supply magnitude of voltage is 1.65V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320643876.9U CN203479883U (en) | 2013-10-18 | 2013-10-18 | Reference voltage pull-type signal acquisition circuit of electrical fire monitoring detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320643876.9U CN203479883U (en) | 2013-10-18 | 2013-10-18 | Reference voltage pull-type signal acquisition circuit of electrical fire monitoring detector |
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| CN203479883U true CN203479883U (en) | 2014-03-12 |
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| CN201320643876.9U Expired - Fee Related CN203479883U (en) | 2013-10-18 | 2013-10-18 | Reference voltage pull-type signal acquisition circuit of electrical fire monitoring detector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485822A (en) * | 2014-12-09 | 2015-04-01 | 中国电子科技集团公司第三十八研究所 | Serially connected electricity supply power supply for multi-stage depressed collector traveling wave tube |
| CN108627624A (en) * | 2018-04-17 | 2018-10-09 | 上海艾晟特环保科技有限公司 | A kind of the pH signal conditions transmission circuit and water quality real-time monitoring system of extremely low power dissipation |
| CN109839127A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of airborne proximity sensor Acquisition Circuit |
-
2013
- 2013-10-18 CN CN201320643876.9U patent/CN203479883U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485822A (en) * | 2014-12-09 | 2015-04-01 | 中国电子科技集团公司第三十八研究所 | Serially connected electricity supply power supply for multi-stage depressed collector traveling wave tube |
| CN109839127A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of airborne proximity sensor Acquisition Circuit |
| CN109839127B (en) * | 2017-11-27 | 2021-04-20 | 中国航空工业集团公司西安航空计算技术研究所 | Airborne proximity sensor acquisition circuit |
| CN108627624A (en) * | 2018-04-17 | 2018-10-09 | 上海艾晟特环保科技有限公司 | A kind of the pH signal conditions transmission circuit and water quality real-time monitoring system of extremely low power dissipation |
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Granted publication date: 20140312 Termination date: 20191018 |