CN213843369U - Peak current moment detection circuit for alternating current source and alternating current carrier - Google Patents
Peak current moment detection circuit for alternating current source and alternating current carrier Download PDFInfo
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- CN213843369U CN213843369U CN202022870866.1U CN202022870866U CN213843369U CN 213843369 U CN213843369 U CN 213843369U CN 202022870866 U CN202022870866 U CN 202022870866U CN 213843369 U CN213843369 U CN 213843369U
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Abstract
The utility model discloses a peak current moment detection circuitry for exchanging source and exchanging year, including sampling resistance R1, difference sampling circuit, absolute value circuit, the peak value sampling and the holding circuit who exchanges the positive signal that connect gradually, the peak value sampling and the holding circuit who exchanges the positive signal are equipped with direct current signal sample terminal and bleeder circuit. The differential sampling circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a first amplifier U1, wherein the resistances of the third resistor R3 and the fourth resistor R4 are equal, and the resistances of the second resistor R2 and the fifth resistor R5 are equal. The peak detection can be carried out on signals with different current sizes by selecting the sampling resistor, and the peak current detection can be carried out on waveform signals with different frequencies by the on/off frequency of the switch.
Description
Technical Field
The utility model relates to a peak current detection circuitry constantly especially relates to a peak current detection circuitry constantly that is used for exchanging the source and exchanges and carries.
Background
The peak current moment detection circuit is a basic circuit of the waveform peak value of a current signal, and is necessary for sampling the peak current of an alternating current power supply/alternating current electronic load. In order to prevent short circuit, open circuit and leakage, it is necessary to detect the current of the ac source in the case of ac source application, and in the case of motor control, it is necessary to check the load of the motor by detecting the current of the motor, and adjust the operation of the motor according to the current to achieve the purpose of automatic control. When the AC load is applied to testing equipment such as an AC source, parameters such as peak current and peak factor of the tested equipment need to be reflected correctly, and the accuracy of the tested equipment is ensured.
In the prior art, a mainstream implementation of a peak current detection circuit is shown in fig. 1, and includes: voltage comparator, homophase amplifier, sample hold circuit, drive circuit, the sample hold circuit includes: the voltage follower tracks the voltage of the holding circuit, namely the voltage output by the voltage follower is equal to the voltage of the holding circuit, the voltage comparator compares the output voltage signal of the in-phase amplifier with the voltage signal Uin input by the tracking detection circuit, the comparison result is output by the voltage comparator to control the driving circuit, and the driving circuit controls the on or off of the controlled switch. The circuit directly detects and compares the voltage value of the voltage signal Uin, and improves the precision of the detection circuit.
The prior art has the following disadvantages:
the scheme is generally applied to peak detection of voltage/current signals with positive input signals, the alternating current source and the alternating current carrier waveform signals are generally positive and negative waveforms based on reference points, and a driving circuit is added, so that the complexity of the circuit is increased. This scheme is not suitable for peak detection of ac sources and ac loads.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a peak current moment detection circuitry that is used for exchanging source and exchanging year.
The utility model aims at realizing through the following technical scheme:
the utility model discloses a peak current moment detection circuitry for exchanging source and exchanging year, including sampling resistance R1, difference sampling circuit, absolute value circuit, the peak value sampling and the holding circuit of the positive signal of interchange that connect gradually, the peak value sampling and the holding circuit of the positive signal of interchange are equipped with direct current signal sample end and bleeder circuit.
By the above-mentioned the technical scheme provided by the utility model, the embodiment of the utility model provides a peak current detection circuitry constantly for exchanging the source and exchanging and carrying, accessible sampling resistance selects and carries out peak detection to the signal of different electric currents size to and the disconnection/closed frequency through the switch realize carrying out peak current detection to the waveform signal of different frequencies.
Drawings
Fig. 1 is a schematic diagram of a peak current time detection circuit in the prior art.
Fig. 2 is a schematic diagram of a peak current time detection circuit for an ac source and an ac load according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
The utility model discloses a peak current moment detection circuitry for exchanging source and exchanging year, the concrete implementation mode of its preferred is:
the sampling circuit comprises a sampling resistor R1, a differential sampling circuit, an absolute value circuit and an AC positive signal peak value sampling and holding circuit which are sequentially connected, wherein the AC positive signal peak value sampling and holding circuit is provided with a DC signal sampling end and a bleeder circuit.
The differential sampling circuit comprises a resistor two R2, a resistor three R3, a resistor four R4, a resistor five R5 and an amplifier one U1, wherein the resistor three R3 and the resistor four R4 are respectively connected with two ends of the sampling resistor R1, the resistor two R2 and the resistor three R3 are respectively connected with a non-inverting input end of the amplifier one U1, the resistor four R4 and the resistor five R5 are respectively connected with an inverting input end of the amplifier one U1, the resistor two R2 is grounded, and the resistor five R5 is combined with an output end of the amplifier one U1 and then connected with the absolute value circuit through a resistor six R6.
The resistance values of the resistor three R3 and the resistor four R4 are equal, and the resistance values of the resistor two R2 and the resistor five R5 are equal.
The absolute value circuit includes a plurality of resistors R7, R8, R9, R10, R11, two diodes D1, D2, two amplifiers U2, U3.
The peak value sampling and holding circuit of the alternating current positive signal comprises a plurality of resistors R12, R13, R14, R15, R16, R20, two diodes D3 and D4, two amplifiers U4 and U5, two capacitors C1 and C2.
The bleeder circuit comprises a plurality of resistors R17, R18, R19 and a field effect transistor Q1.
The utility model discloses a peak current moment detection circuitry for exchanging source and exchanging year mainly solves and carries the peak current that the wave form signal is based on the positive and negative wave form signal of reference point to exchanging source and exchanging and detect. Meanwhile, signals with different current sizes can be selected through the sampling resistor to carry out peak value detection, and the peak value current detection of waveform signals with different frequencies is realized through the opening/closing frequency of the switch. The method mainly introduces a method for detecting the peak current by using a simple circuit to realize the detection of an alternating current source and an alternating current carrier.
The specific embodiment is as follows:
as shown in fig. 2, firstly, alternating current flows through a sampling resistor R1, and a current signal is converted into a voltage signal (R1 resistance is reasonably selected according to the magnitude of the current signal to be detected, so as to realize detection of alternating current with different ranges);
r2, R3, R4, R5 and U1 form a differential sampling circuit, R3-R4, R2-R5 and U1 need to be selected according to the detected signal frequency in the partial circuit;
r7, R8, R9, R10, R11, D1, D2, U2 and U3 form an absolute value circuit, and positive and negative alternating current signals are converted into positive alternating current signals;
r12, R13, R14, R15, R16, R20, D3, D4, U4, U5, C1 and C2 form peak value sampling and holding of an alternating current positive signal, an I _ PACK signal is a direct current signal, the signal can be sampled through AD acquisition, and the peak value current value can be accurately reflected according to the proportion;
r17, R18, R19, Q1 constitute bleeder circuit, and the main function is when the alternating current signal reduces, discharges to C2 through controlling to open Q1, reaches the size of real-time detection peak current signal.
The utility model discloses a peak current detection circuitry constantly for exchanging source and exchanging and carrying provides a perfect scheme for positive negative alternating current signal's peak value detection, utilizes the energy storage of electric capacity to have the maintenance characteristic to voltage, utilizes electronic switch to discharge peak value energy storage electric capacity, realizes carrying out the peak value sampling to different ranges, the alternating current signal of different frequencies. The cost in product design is reduced. Different sampling resistance values can be selected according to project requirements to be suitable for different alternating current signals, and the switching frequency of the MOS tube can be controlled to be suitable for the alternating current signals under different frequencies.
In a specific embodiment, sampling resistance R1 can be replaced with current transformer, and this utility model well main application electric capacity energy storage characteristic keeps voltage signal, realizes the peak detection of electric current. In the scheme, the application device is of a non-specific type, and the device with related functions can realize related functions when being built according to a circuit.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The peak current moment detection circuit for the alternating current source and the alternating current carrier is characterized by comprising a sampling resistor (R1), a differential sampling circuit, an absolute value circuit and a peak sampling and holding circuit of an alternating current positive signal, wherein the peak sampling and holding circuit of the alternating current positive signal is provided with a direct current signal sampling end and a discharge circuit.
2. The peak current time detection circuit for an alternating current source and an alternating current carrier as claimed in claim 1, wherein the differential sampling circuit comprises a resistor two (R2), a resistor three (R3), a resistor four (R4), a resistor five (R5) and an amplifier one (U1), the resistor three (R3) and the resistor four (R4) are respectively connected with two ends of the sampling resistor (R1), the resistor two (R2) and the resistor three (R3) are respectively connected with a non-inverting input end of the amplifier one (U1), the resistor four (R4) and the resistor five (R5) are respectively connected with an inverting input end of the amplifier one (U1), the resistor two (R2) is grounded, and the resistor five (R5) is combined with an output end of the amplifier one (U1) and then connected with the absolute value circuit through a resistor six (R6).
3. The peak current timing detection circuit for an ac source and a ac load of claim 2, wherein the resistances of the resistor three (R3) and the resistor four (R4) are equal, and the resistances of the resistor two (R2) and the resistor five (R5) are equal.
4. The peak current time detection circuit for an alternating current source and a alternating current carrier according to claim 3, characterized in that the absolute value circuit comprises a plurality of resistors (R7, R8, R9, R10, R11), two diodes (D1, D2), two amplifiers (U2, U3).
5. The peak current time detection circuit for an alternating current source and an alternating current carrier according to claim 4, characterized in that the peak sample and hold circuit for the alternating current positive signal comprises a plurality of resistors (R12, R13, R14, R15, R16, R20), two diodes (D3, D4), two amplifiers (U4, U5), two capacitors (C1, C2).
6. The peak current time detection circuit for an ac source and an ac carrier according to claim 5, wherein the bleeder circuit comprises a plurality of resistors (R17, R18, R19), a field effect transistor (Q1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022870866.1U CN213843369U (en) | 2020-12-02 | 2020-12-02 | Peak current moment detection circuit for alternating current source and alternating current carrier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022870866.1U CN213843369U (en) | 2020-12-02 | 2020-12-02 | Peak current moment detection circuit for alternating current source and alternating current carrier |
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| CN213843369U true CN213843369U (en) | 2021-07-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121587A (en) * | 2017-06-26 | 2017-09-01 | 佛山科学技术学院 | Peak value and excessively peak moment tracing detection circuit |
| CN115951116A (en) * | 2023-03-15 | 2023-04-11 | 常州同惠电子股份有限公司 | Peak current detection system and test method |
-
2020
- 2020-12-02 CN CN202022870866.1U patent/CN213843369U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121587A (en) * | 2017-06-26 | 2017-09-01 | 佛山科学技术学院 | Peak value and excessively peak moment tracing detection circuit |
| CN107121587B (en) * | 2017-06-26 | 2023-02-28 | 佛山科学技术学院 | Peak value and over-peak time tracking detection circuit |
| CN115951116A (en) * | 2023-03-15 | 2023-04-11 | 常州同惠电子股份有限公司 | Peak current detection system and test method |
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