CN111913031A - Detection alarm circuit for input overvoltage and undervoltage - Google Patents
Detection alarm circuit for input overvoltage and undervoltage Download PDFInfo
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- CN111913031A CN111913031A CN202010613477.2A CN202010613477A CN111913031A CN 111913031 A CN111913031 A CN 111913031A CN 202010613477 A CN202010613477 A CN 202010613477A CN 111913031 A CN111913031 A CN 111913031A
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 238000013461 design Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 3
- 230000002159 abnormal effect 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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides an input over-voltage and under-voltage detection alarm circuit which comprises a comparator U1A and a comparator U1B, wherein the external input voltage and an over-voltage and under-voltage limit value are detected and compared through the comparator U1A and the comparator U1B, and an over-voltage and under-voltage alarm state is indicated through driving a light emitting diode LD 1. The invention has the beneficial effects that: the structure is simple and easy to realize; the requirements on the precision of the resistor and the capacitor are low, the error is small, the subsequent design work is facilitated, and the design cost is saved; the comparator is a common voltage comparator, so that the universality is strong and the application range is wide.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a detection alarm circuit for input overvoltage and undervoltage.
Background
In the design of an electronic product test and a product system power supply module, the test failure is caused by inputting an over-voltage and under-voltage abnormal power supply state, or the electronic product is damaged due to faults, so that the development of normal test and design work is influenced. Therefore, the detection circuit has important significance for the detection work of the input overvoltage and undervoltage, the detection work is usually carried out by using the detection alarm circuit of the input overvoltage and undervoltage, but the existing alarm circuit has a complex structure and poor universality.
Disclosure of Invention
In view of the above, the present invention is directed to a detection alarm circuit for detecting an over-voltage and an under-voltage, so as to solve the above-mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the detection alarm circuit for input over-voltage and under-voltage includes comparator U1A and comparator U1B,
the positive input end of the comparator U1A is connected to one end of a resistor R1 and one end of a resistor R7 respectively, the other end of the resistor R1 is connected to VREF, the other end of the resistor R7 is grounded, the negative input end of the comparator U1A is connected to one end of a resistor R3, a resistor R9 and one end of a capacitor C1 respectively, the other end of the resistor R9 is connected to Vin and one end of a resistor R4 respectively, the other end of the resistor R3, the other end of the capacitor C1 and the other end of the resistor R4 are grounded, the output end of the comparator U1A is connected to the positive end of a diode D1 and one end of a resistor R6329 respectively, the other end of the resistor R11 is connected to VCC, and the negative end of the diode D1 is connected to the positive end of a diode D;
the negative input end of the comparator U1B is connected to one end of a resistor R2 and one end of a resistor R8, the other end of the resistor R2 is connected to VREF, the other end of the resistor R8 is grounded, the positive input end of the comparator U1B is connected to one end of a resistor R6, a resistor R10 and one end of a capacitor C2, the other end of the resistor R10 is connected to one end of Vin and one end of a resistor R5, the other end of the resistor R6, the other end of the capacitor C2 and the other end of the resistor R5 are grounded, the output end of the comparator U1B is connected to the positive end of a diode D2 and one end of a resistor R12, the other end of the resistor R12 is connected to VCC, and the negative end of the diode D2 is further connected to the positive end of;
the negative end of the light emitting diode LD1 is connected to one end of a resistor R13, and the other end of the resistor R13 is grounded.
Further, the comparator U1B and the comparator U1A share a power supply terminal and a ground terminal.
Further, the power supply terminal of the comparator U1A is connected to VCC, and the ground terminal is grounded.
Further, the comparator U1A and the comparator U1B are LM119 or LM193 in model number.
Further, the resistors R1 and R7 are resistors for setting an overvoltage state, and the resistance precision is 1%.
Further, the resistors R2 and R8 are resistors set in an undervoltage state, and the precision of the resistance is 1%.
Furthermore, the resistors R11 and R12 have the same resistance, the resistors R9 and R10 have the same resistance, the resistors R4 and R5 have the same resistance, and the resistors R3 and R6 have the same resistance.
Further, the capacitance values of the capacitors C1 and C2 are the same.
Further, the type of the diode D1 and the type of the diode D2 are both 1N4007 or 1N 4148.
Compared with the prior art, the detection alarm circuit for the input overvoltage and undervoltage has the following advantages:
the detection alarm circuit for the input over-voltage and under-voltage has a simple structure and is easy to realize; the requirements on the precision of the resistor and the capacitor are low, the error is small, the subsequent design work is facilitated, and the design cost is saved; the comparator is a common voltage comparator, so that the universality is strong and the application range is wide.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a detection alarm circuit for detecting input over-voltage and under-voltage according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in FIG. 1, the detection alarm circuit for the input overvoltage and undervoltage comprises a comparator U1A and a comparator U1B,
the positive input end of the comparator U1A is respectively connected with one end of a resistor R1 and one end of a resistor R7, the other end of the resistor R1 is connected to VREF (external input reference voltage), the other end of the resistor R7 is grounded, the negative input end of the comparator U1A is respectively connected with one end of a resistor R3, a resistor R9 and one end of a capacitor C1, the other end of the resistor R9 is respectively connected to Vin and a resistor R4, the other end of the resistor R3, the other end of the capacitor C1 and the other end of the resistor R4 are grounded, the output end of the comparator U1A is respectively connected to the positive end of a diode D1 and one end of a resistor R11, the other end of a resistor R11 is connected to VCC, and the negative end of the diode D1 is respectively connected to the negative end of a diode D2;
the negative input end of the comparator U1B is connected to one end of a resistor R2 and one end of a resistor R8, the other end of the resistor R2 is connected to VREF, the other end of the resistor R8 is grounded, the positive input end of the comparator U1B is connected to one end of a resistor R6, a resistor R10 and one end of a capacitor C2, the other end of the resistor R10 is connected to one end of Vin and one end of a resistor R5, the other end of the resistor R6, the other end of the capacitor C2 and the other end of the resistor R5 are grounded, the output end of the comparator U1B is connected to the positive end of a diode D2 and one end of a resistor R12, the other end of the resistor R12 is connected to VCC, and the negative end of the diode D2 is further connected to the positive end of;
the negative end of the light emitting diode LD1 is connected to one end of a resistor R13, and the other end of the resistor R13 is grounded.
The comparator U1B and the comparator U1A share power and ground terminals.
The power supply terminal of the comparator U1A is connected to VCC, and the ground terminal is grounded.
The comparator U1A and the comparator U1B are integrated on the same chip and are two mutually independent high-precision voltage comparators, and the type is LM119 or LM 193.
The resistors R1 and R7 are resistors set in an overvoltage state, and the resistance precision is 1%.
The resistors R2 and R8 are resistors arranged in an undervoltage state, and the resistance precision is 1%.
The resistors R11 and R12 have the same resistance, the resistors R9 and R10 have the same resistance, the resistors R4 and R5 have the same resistance, and the resistors R3 and R6 have the same resistance.
The capacitance values of the capacitors C1 and C2 are the same.
The type of the diode D1 and the type of the diode D2 are both 1N4007 or 1N 4148.
The working process of the embodiment is as follows:
detecting and comparing the external input voltage with an over-under voltage limit value through a comparator; and an over-voltage and under-voltage alarm state is indicated by driving a light emitting diode. Firstly, filtering and voltage division sampling are carried out on input voltage, the voltage is input into two comparators in independent states, and the comparators are respectively compared with undervoltage and overvoltage set values to generate a comparison output state so as to drive a light emitting tube to generate alarm information and detect whether the input voltage belongs to a normal set voltage range.
Specifically, the overvoltage condition setting resistors R1, R7 limit the overvoltage condition by accurately dividing VREF to be input to the positive input terminal of the comparator U1A. The input voltage Vin is filtered by C1, divided by R3, R4 and R9, and input to the negative input terminal of the comparator U1A. When the voltage value of the positive input end of the comparator U1A is larger than that of the negative input end, which is equal to the condition that the external input voltage is smaller than the overvoltage condition limit, the comparator U1A outputs high level, and the status indicator lamp is turned off. When the voltage value of the positive input end of the comparator U1A is smaller than that of the negative input end, which is equal to the condition that the external input voltage is larger than the overvoltage limiting voltage, the comparator U1A outputs low level, and an external pull-up driving state indicator lamp is lightened to provide input overvoltage alarm indication.
The undervoltage setting resistors R2 and R8 perform accurate voltage division processing on VREF, and limit and input the overvoltage to the negative input terminal of the comparator U1B. The input voltage Vin is filtered by the C2, divided by the R6, the R5 and the R10, and input to the positive input end of the comparator U1B. When the voltage value of the positive input end of the comparator U1B is larger than that of the negative input end, which is equal to the condition that the external input voltage is larger than the undervoltage condition limit, the comparator U1B outputs high level, and the status indicator lamp is turned off. When the voltage value of the positive input end of the comparator U1B is smaller than that of the negative input end, which is equal to the condition that the external input voltage is smaller than the undervoltage state limiting voltage, the comparator U1B outputs low level, and the external pull-up driving state indicator lamp is lightened to provide input undervoltage alarm indication.
When the precision of the over-under voltage state setting resistor in the circuit of the embodiment of the invention is 1%, the over-under voltage state of the input voltage can be stably and accurately detected, the convenience is provided for the design work, and the design cost is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides an input detection alarm circuit of undervoltage which characterized in that: comprises a comparator U1A and a comparator U1B,
the positive input end of the comparator U1A is respectively connected with one end of a resistor R1 and one end of a resistor R7, the other end of the resistor R1 is connected with VREF, the other end of the resistor R7 is grounded, the negative input end of the comparator U1A is respectively connected with one end of a resistor R3, a resistor R9 and one end of a capacitor C1, the other end of the resistor R9 is respectively connected with Vin and a resistor R4, the other end of the resistor R3, the other end of the capacitor C1 and the other end of the resistor R4 are grounded, the output end of the comparator U1A is respectively connected with the positive end of a diode D1 and one end of a resistor R6329, the other end of the resistor R11 is connected with VCC, the negative end of the diode D1 is respectively connected with the positive end of a diode D2 and,
the negative input end of the comparator U1B is connected to one end of a resistor R2 and one end of a resistor R8 respectively, the other end of the resistor R2 is connected to VREF, the other end of the resistor R8 is grounded, the positive input end of the comparator U1B is connected to one end of a resistor R6, a resistor R10 and one end of a capacitor C2 respectively, the other end of the resistor R10 is connected to one end of Vin and one end of a resistor R5 respectively, the other end of the resistor R6, the other end of the capacitor C2 and the other end of the resistor R5 are grounded, the output end of the comparator U1B is connected to the positive end of a diode D2 and one end of a resistor R12 respectively, the other end of the resistor R12 is connected to VCC, the negative end of the diode D2 is also connected to,
the negative end of the light emitting diode LD1 is connected to one end of a resistor R13, and the other end of the resistor R13 is grounded.
2. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the comparator U1B and the comparator U1A share power and ground terminals.
3. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the power supply terminal of the comparator U1A is connected to VCC, and the ground terminal is grounded.
4. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the comparator U1A and the comparator U1B are LM119 or LM193 in model number.
5. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the resistors R1 and R7 are resistors set in an overvoltage state, and the resistance precision is 1%.
6. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the resistors R2 and R8 are resistors arranged in an undervoltage state, and the resistance precision is 1%.
7. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the resistors R11 and R12 have the same resistance, the resistors R9 and R10 have the same resistance, the resistors R4 and R5 have the same resistance, and the resistors R3 and R6 have the same resistance.
8. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the capacitance values of the capacitors C1 and C2 are the same.
9. The detection alarm circuit for the input overvoltage and undervoltage as claimed in claim 1, wherein: the type of the diode D1 and the type of the diode D2 are both 1N4007 or 1N 4148.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010613477.2A CN111913031A (en) | 2020-06-30 | 2020-06-30 | Detection alarm circuit for input overvoltage and undervoltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010613477.2A CN111913031A (en) | 2020-06-30 | 2020-06-30 | Detection alarm circuit for input overvoltage and undervoltage |
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| CN111913031A true CN111913031A (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010613477.2A Pending CN111913031A (en) | 2020-06-30 | 2020-06-30 | Detection alarm circuit for input overvoltage and undervoltage |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202373958U (en) * | 2011-12-28 | 2012-08-08 | 中国航空工业集团公司第六三一研究所 | Over/under voltage protection circuit |
| CN105158704A (en) * | 2015-08-28 | 2015-12-16 | 贵州天义电器有限责任公司 | DC power supply quality detection module |
| CN105305797A (en) * | 2015-10-15 | 2016-02-03 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage and undervoltage protection circuit for output of DC/DC power supply |
| CN106253651A (en) * | 2016-09-30 | 2016-12-21 | 国网江苏省电力公司南京供电公司 | A kind of numerically controlled modularized microcomputer source over under-voltage protection circuit |
| CN107449959A (en) * | 2017-07-25 | 2017-12-08 | 郑州瑞能电源技术有限公司 | Input over under-voltage protection circuit |
-
2020
- 2020-06-30 CN CN202010613477.2A patent/CN111913031A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202373958U (en) * | 2011-12-28 | 2012-08-08 | 中国航空工业集团公司第六三一研究所 | Over/under voltage protection circuit |
| CN105158704A (en) * | 2015-08-28 | 2015-12-16 | 贵州天义电器有限责任公司 | DC power supply quality detection module |
| CN105305797A (en) * | 2015-10-15 | 2016-02-03 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage and undervoltage protection circuit for output of DC/DC power supply |
| CN106253651A (en) * | 2016-09-30 | 2016-12-21 | 国网江苏省电力公司南京供电公司 | A kind of numerically controlled modularized microcomputer source over under-voltage protection circuit |
| CN107449959A (en) * | 2017-07-25 | 2017-12-08 | 郑州瑞能电源技术有限公司 | Input over under-voltage protection circuit |
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Application publication date: 20201110 |
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