CN111721999A - Peak voltage detection circuit - Google Patents
Peak voltage detection circuit Download PDFInfo
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- CN111721999A CN111721999A CN202010614330.5A CN202010614330A CN111721999A CN 111721999 A CN111721999 A CN 111721999A CN 202010614330 A CN202010614330 A CN 202010614330A CN 111721999 A CN111721999 A CN 111721999A
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000004146 energy storage Methods 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a peak voltage detection circuit, which comprises a first voltage follower, a second voltage follower, an energy storage unit, a first diode and a second diode, wherein a first forward input end is connected with an input signal, a first reverse input end is connected with a first output end through the first diode, a first output end is connected with a second forward input end through the second diode, a second reverse input end is connected with a second output end, a first reverse input end is connected with a second output end, one end of the energy storage unit is connected between the second diode and the second forward input end, the other end of the energy storage unit is grounded, the peak voltage of the input signal is temporary, and the energy storage unit stores the peak voltage and outputs the peak voltage through the second output end; the circuit is simple, the peak voltage can be measured and processed timely, accurately, simply and visually, the measuring process is time-saving and labor-saving, the detection cost is effectively reduced, and the product quality is improved.
Description
Technical Field
The invention relates to the field of peak voltage detection, in particular to a peak voltage detection circuit.
Background
In the prior art, when the peak voltage of a circuit needs to be detected, the peak voltage of the current circuit is obtained by directly measuring the circuit through an oscilloscope. The peak voltage is measured by an oscilloscope, manual judgment is needed, and the measurement process is time-consuming and labor-consuming. In addition, in practical application of products, it is difficult to detect and process the peak voltage of the product, and when the peak voltage is higher than a critical value, the circuit is easily damaged, which causes a defective product, thereby reducing the quality of the product.
Therefore, a peak voltage detection circuit is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a peak voltage detection circuit which is simple in circuit, can be used for timely, accurately, simply and visually measuring and processing peak voltage, is time-saving and labor-saving in the measurement process, and is capable of effectively reducing the detection cost and improving the product quality.
In order to achieve the above purpose, the invention discloses a peak voltage detection circuit, which comprises a first voltage follower, a second voltage follower, an energy storage unit, a first diode and a second diode, wherein the first voltage follower comprises a first forward input end, a first reverse input end and a first output end, the second voltage follower comprises a second forward input end, a second reverse input end and a second output end, the first forward input end is connected with an input signal, the first reverse input end is connected with the first output end through the first diode, the first output end is connected with the second forward input end through the second diode, the second reverse input end is connected with the second output end, the first reverse input end is connected with the second output end, one end of the energy storage unit is connected between the second diode and the second forward input end, the other end of the energy storage unit is grounded, the peak voltage of the input signal is temporary, and the energy storage unit stores the peak voltage and outputs the peak voltage through the second output end.
Compared with the prior art, the peak voltage detection circuit comprises a first voltage follower, a second voltage follower, an energy storage unit, a first diode and a second diode, when the peak voltage of an input signal comes, the peak voltage detection circuit can detect the peak voltage in time and store the peak voltage through the energy storage unit, and then the peak voltage is output through a second output end for subsequent measurement and processing.
Preferably, the anode of the first diode is connected to the first inverting input terminal, and the cathode is connected to the first output terminal.
Preferably, the anode of the second diode is connected to the first reverse input terminal, and the cathode is connected to the second forward input terminal.
Preferably, the peak voltage detection circuit further includes a discharge switch, one end of the discharge switch is connected between the cathode of the second diode and the second positive input end, and the other end of the discharge switch is grounded.
Preferably, the peak voltage detection circuit further includes a protection resistor connected in series between the first inverting input terminal and the second inverting input terminal.
Preferably, the energy storage unit is an energy storage capacitor.
Drawings
Fig. 1 is a circuit diagram of a peak voltage detection circuit of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, a peak voltage detecting circuit 100 of the present embodiment includes a first voltage follower 10, a second voltage follower 20, an energy storage unit C, a first diode D1 and a second diode D2, wherein the first voltage follower 10 includes a first forward input end 11, a first reverse input end 12 and a first output end 13, and the second voltage follower 20 includes a second forward input end 21, a second reverse input end 22 and a second output end 23.
The first forward input terminal 11 is connected to an input signal Vin, the first backward input terminal 12 is connected to the first output terminal 13 through a first diode D1, specifically, an anode of the first diode D1 is connected to the first backward input terminal 12, a cathode is connected to the first output terminal 13, it is noted that a connection node between the cathode of the first diode D1 and the first output terminal 13 is a, and a voltage at a point a is VA. The first output terminal 13 is connected to the second forward input terminal 21 through a second diode D2, specifically, the anode of the second diode D2 is connected to the first reverse input terminal 12, and the cathode is connected to the second forward input terminal 21.
The second inverting input terminal 22 is connected to the second output terminal 23, the first inverting input terminal 12 is connected to the second output terminal 23, the energy storage unit C is an energy storage capacitor, one end of the energy storage unit C is connected between the second diode D2 and the second inverting input terminal 21, the other end of the energy storage unit C is grounded, the peak voltage of the input signal Vin is temporarily stored in the energy storage unit C, and the peak voltage is output through the second output terminal 23.
Referring to fig. 1, the peak voltage detecting circuit 100 of the present embodiment further includes a protection resistor R and a discharge switch S, wherein the protection resistor R is connected in series between the first inverting input terminal 12 and the second inverting input terminal 22 to prevent the first voltage follower 10 and the second voltage follower 20 from being damaged due to direct connection when the peak voltage is too large. One end of the discharge switch S is connected between the cathode of the second diode D2 and the second positive input terminal 21, and the other end is grounded, and when a connection node of the discharge switch S between the cathode of the second diode D2 and the second positive input terminal 21 is B, the voltage at the point B is VB. The discharging switch S is in an off state by default, when the peak voltage detection circuit 100 finishes the detection of the peak voltage for one time and needs to be reset for the next peak voltage detection, the discharging switch S is manually closed, the branch where the discharging switch S is located and the branch where the energy storage unit C is located are in a parallel connection state at the moment, the electric quantity stored by the energy storage unit C is released through the branch where the discharging switch S is located, and therefore the resetting of the peak voltage detection circuit 100 is achieved.
Referring to fig. 1, the operation of the peak voltage detecting circuit 100 of the present embodiment is described below, and the output voltage of the second output terminal 23 is recorded as VOUT:
1. in a normal state, the input signal Vin is equal to the voltage VOUT of the second output terminal 23, that is, Vin is equal to VOUT;
2. when the peak value of the input signal Vin is temporary, and the peak voltage is greater than the voltage of the second output terminal 23, i.e. Vin > VOUT, the first output terminal 13 outputs a forward signal, the first diode D1 is turned off, the second diode D2 is turned on, and the first voltage follower 10 forms a voltage follower circuit through the second diode D2, the second voltage follower 20 and the protection resistor R. At this time, the current output from the first output terminal 13 charges the energy storage unit C through the second diode D2, and the voltage VA at the point a is VOUT + VD 2;
3. when the input signal Vin returns to normal (i.e. the input signal Vin decreases), the voltage VA at the first output terminal 13 also decreases, since the voltage VA at the first output terminal 13 is less than the voltage VB at the second positive input terminal 21, the second diode D2 is turned off at this time, the energy storage unit C has no discharge path, so the energy storage unit C keeps storing the previous peak voltage, and the first diode D1 is turned on. Therefore, by measuring the voltage VOUT at the second output terminal 23 of the circuit, the peak voltage of the input signal Vin can be detected in real time for subsequent analysis processing.
Referring to fig. 1, the present invention includes a first voltage follower 10, a second voltage follower 20, an energy storage unit C, a first diode D1 and a second diode D2, when the peak voltage of an input signal Vin comes, the peak voltage detection circuit 100 can detect and store the peak voltage through the energy storage unit C in time, and then output the peak voltage through a second output terminal 23 for subsequent measurement and processing, the circuit configuration is simple, and the peak voltage of the input signal Vin can be detected in time, accurately, simply and intuitively, the measurement process and the measurement cost are greatly reduced, the measurement process is time-saving and labor-saving, and the product quality is effectively improved.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (6)
1. A peak voltage detection circuit, characterized in that: the high-voltage direct current power supply comprises a first voltage follower, a second voltage follower, an energy storage unit, a first diode and a second diode, wherein the first voltage follower comprises a first forward input end, a first reverse input end and a first output end, the second voltage follower comprises a second forward input end, a second reverse input end and a second output end, the first forward input end is connected with an input signal, the first reverse input end is connected with the first output end through the first diode, the first output end is connected with the second forward input end through the second diode, the second reverse input end is connected with the second output end, the first reverse input end is connected with the second output end, one end of the energy storage unit is connected between the second diode and the second forward input end, the other end of the energy storage unit is grounded, and the peak voltage of the input signal comes temporarily, the energy storage unit stores the peak voltage and outputs the peak voltage through the second output end.
2. The peak voltage detection circuit according to claim 1, characterized in that: the anode of the first diode is connected with the first reverse input end, and the cathode of the first diode is connected with the first output end.
3. The peak voltage detection circuit according to claim 1, characterized in that: and the anode of the second diode is connected with the first reverse input end, and the cathode of the second diode is connected with the second forward input end.
4. The peak voltage detection circuit according to claim 1, characterized in that: the power supply further comprises a discharge switch, one end of the discharge switch is connected between the negative electrode of the second diode and the second positive input end, and the other end of the discharge switch is grounded.
5. The peak voltage detection circuit according to claim 1, characterized in that: the protection circuit further comprises a protection resistor, and the protection resistor is connected between the first reverse input end and the second reverse input end in series.
6. The peak voltage detection circuit according to claim 1, characterized in that: the energy storage unit is an energy storage capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010614330.5A CN111721999A (en) | 2020-06-30 | 2020-06-30 | Peak voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010614330.5A CN111721999A (en) | 2020-06-30 | 2020-06-30 | Peak voltage detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN111721999A true CN111721999A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010614330.5A Pending CN111721999A (en) | 2020-06-30 | 2020-06-30 | Peak voltage detection circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121548A (en) * | 1982-05-21 | 1983-12-21 | Philips Electronic Associated | Peak voltage detector circuit |
| JPS5990407A (en) * | 1982-11-15 | 1984-05-24 | Nippon Kogaku Kk <Nikon> | Peak detecting circuit |
| CN105306024A (en) * | 2015-11-18 | 2016-02-03 | 上海大学 | Peak voltage detection circuit |
| CN107561049A (en) * | 2017-09-05 | 2018-01-09 | 重庆民泰香料化工有限责任公司 | A kind of AFS peak sample circuit and control method |
| CN110780108A (en) * | 2019-11-26 | 2020-02-11 | 广东晟合技术有限公司 | Peak detection unit, detection system and detection method |
-
2020
- 2020-06-30 CN CN202010614330.5A patent/CN111721999A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121548A (en) * | 1982-05-21 | 1983-12-21 | Philips Electronic Associated | Peak voltage detector circuit |
| JPS5990407A (en) * | 1982-11-15 | 1984-05-24 | Nippon Kogaku Kk <Nikon> | Peak detecting circuit |
| CN105306024A (en) * | 2015-11-18 | 2016-02-03 | 上海大学 | Peak voltage detection circuit |
| CN107561049A (en) * | 2017-09-05 | 2018-01-09 | 重庆民泰香料化工有限责任公司 | A kind of AFS peak sample circuit and control method |
| CN110780108A (en) * | 2019-11-26 | 2020-02-11 | 广东晟合技术有限公司 | Peak detection unit, detection system and detection method |
Non-Patent Citations (1)
| Title |
|---|
| 赛尔吉欧•佛朗哥: "《基于运算放大器和模拟集成电路的电路设计》", 31 August 2004, 西安交通大学出版社 * |
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Application publication date: 20200929 |
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