CN103746676A - Comparison circuit of simple structure - Google Patents
Comparison circuit of simple structure Download PDFInfo
- Publication number
- CN103746676A CN103746676A CN201310586636.4A CN201310586636A CN103746676A CN 103746676 A CN103746676 A CN 103746676A CN 201310586636 A CN201310586636 A CN 201310586636A CN 103746676 A CN103746676 A CN 103746676A
- Authority
- CN
- China
- Prior art keywords
- comparator
- resistance
- comparison circuit
- resistor
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Manipulation Of Pulses (AREA)
Abstract
The invention discloses a comparison circuit of a simple structure. The comparison circuit comprises a comparator A1 and a comparator A2. A capacitor C1 is connected between the two input ends of the comparator A1; a resistor R3 is connected between the output end of the comparator A1 and one input end of the comparator A1; the resistor R3 is connected in parallel with a capacitor C2; the output end of the comparator A1 is connected with one input end of the comparator A2 through a resistor R4; a resistor R5 is connected between the input end of the comparator A2 and the output end of the comparator A2; the other input end of the comparator A2 is connected with a resistor R6; the other end of the resistor R6 is connected with the cathode of a diode; the anode of the diode is grounded; the cathode of the diode is connected with a resistor R7; and the other end of the resistor R7 is connected with a power source. The advantages are as follows: the circuit structure is simple, and the comparison circuit provided by the invention is suitable for a miniaturized control unit.
Description
Technical field
The present invention relates to integrated circuit fields, relate in particular a kind of comparison circuit simple in structure.
Background technology
Comparison circuit has use aspect a lot.In the circuit such as a lot of control circuits, testing circuit, all can use comparison circuit, its application is very extensive.Existing comparison circuit directly adopts a plurality of comparators and peripheral circuit thereof to form comparison circuit, and its circuit structure is complicated, and especially for small-sized control unit, circuit structure too complexity is obviously not too suitable.
Summary of the invention
The invention provides a kind of comparison circuit simple in structure, its circuit structure is simple, is applicable to small-sized control unit.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of comparison circuit simple in structure, it comprises comparator A1 and comparator A2, between described two inputs of comparator A1, be connected with capacitor C 1, between the output of described comparator A1 and an input, be connected with resistance R 3, in described resistance R 3, be parallel with capacitor C 2, the output of described comparator A1 is connected with an input of comparator A2 by resistance R 4, and be connected with resistance R 5 between this input of comparator A2 and output, on another input of described comparator A2, be connected with resistance R 6, the other end of described resistance R 6 is connected on the negative electrode of diode, the plus earth of described diode, on the negative electrode of described diode, be connected with resistance R 7, the other end of described resistance R 7 is connected on power supply.
Further technical scheme is:
As preferably, on two inputs of described comparator A1, be connected with respectively resistance R 1 and resistance R 2.
Further, the resistance of described resistance R 1 and resistance R 2 equates.
As preferably, described comparator A1 and comparator A2 are LM358.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention utilizes two comparators to form comparison circuit, and its circuit structure is simple, is applicable to small-sized control unit.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.Embodiments of the present invention include but not limited to the following example.
[embodiment]
Comparison circuit a kind of simple in structure as shown in Figure 1, it comprises comparator A1 and comparator A2, between described two inputs of comparator A1, be connected with capacitor C 1, between the output of described comparator A1 and an input, be connected with resistance R 3, in described resistance R 3, be parallel with capacitor C 2, the output of described comparator A1 is connected with an input of comparator A2 by resistance R 4, and be connected with resistance R 5 between this input of comparator A2 and output, on another input of described comparator A2, be connected with resistance R 6, the other end of described resistance R 6 is connected on the negative electrode of diode, the plus earth of described diode, on the negative electrode of described diode, be connected with resistance R 7, the other end of described resistance R 7 is connected on power supply.
In the present invention, in comparator A1, capacitor C 1, for eliminating the offset voltage of two inputs of comparator A1, improves precision.Resistance R 3 forms feedback, shunt capacitance C2 in resistance R 3, and resistance direct current signal passes through, and reduces passing through of low frequency signal.4 couples of comparator A2 of resistance R protect, and it plays metering function.The voltage signal of two inputs of comparator A1 is delivered to comparator A1, and resistance R 7, resistance R 6 form the reference voltage of comparator A2, and the predeterminated voltage of the output of comparator A1 and comparator A2 compares and produces voltage feedback signal output.
For two of comparator A1 inputs are protected, on two inputs of described comparator A1, be connected with respectively resistance R 1 and resistance R 2.Resistance R 1 and resistance R 2 all play metering function, avoid that electric current is excessive causes damage to comparator A1.
Described resistance R 1 and the resistance of resistance R 2 equate.One of two input of comparator A1 are low-voltage end, and one is high voltage end, and the resistance of resistance R 1 and resistance R 2 equates to improve the precision of this circuit, than the unequal situation precision of resistance of resistance R 1 and resistance R 2, at least can improve 20%.
In order to improve the overall performance of this circuit, described comparator A1 and comparator A2 are LM358.LM358 is cheap, and superior performance adopts LM358 as two comparators, can improve the overall performance of this circuit.
Be as mentioned above embodiments of the invention.The present invention is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (4)
1. a comparison circuit simple in structure, it comprises comparator A1 and comparator A2, it is characterized in that: between described two inputs of comparator A1, be connected with capacitor C 1, between the output of described comparator A1 and an input, be connected with resistance R 3, in described resistance R 3, be parallel with capacitor C 2, the output of described comparator A1 is connected with an input of comparator A2 by resistance R 4, and be connected with resistance R 5 between this input of comparator A2 and output, on another input of described comparator A2, be connected with resistance R 6, the other end of described resistance R 6 is connected on the negative electrode of diode, the plus earth of described diode, on the negative electrode of described diode, be connected with resistance R 7, the other end of described resistance R 7 is connected on power supply.
2. a kind of comparison circuit simple in structure according to claim 1, is characterized in that: on two inputs of described comparator A1, be connected with respectively resistance R 1 and resistance R 2.
3. a kind of comparison circuit simple in structure according to claim 2, is characterized in that: described resistance R 1 and the resistance of resistance R 2 equate.
4. a kind of comparison circuit simple in structure according to claim 1, is characterized in that: described comparator A1 and comparator A2 are LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310586636.4A CN103746676A (en) | 2013-11-21 | 2013-11-21 | Comparison circuit of simple structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310586636.4A CN103746676A (en) | 2013-11-21 | 2013-11-21 | Comparison circuit of simple structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103746676A true CN103746676A (en) | 2014-04-23 |
Family
ID=50503676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310586636.4A Pending CN103746676A (en) | 2013-11-21 | 2013-11-21 | Comparison circuit of simple structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103746676A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0175853A2 (en) * | 1984-08-28 | 1986-04-02 | Kabushiki Kaisha Toshiba | Rectifier circuit |
| CN101902123A (en) * | 2008-12-03 | 2010-12-01 | 东部高科股份有限公司 | Power IC and driving method thereof |
| CN201717780U (en) * | 2010-06-01 | 2011-01-19 | 上海积致电子科技有限公司 | Parallel-current circuit of switching power supply |
-
2013
- 2013-11-21 CN CN201310586636.4A patent/CN103746676A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0175853A2 (en) * | 1984-08-28 | 1986-04-02 | Kabushiki Kaisha Toshiba | Rectifier circuit |
| CN101902123A (en) * | 2008-12-03 | 2010-12-01 | 东部高科股份有限公司 | Power IC and driving method thereof |
| CN201717780U (en) * | 2010-06-01 | 2011-01-19 | 上海积致电子科技有限公司 | Parallel-current circuit of switching power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104393760B (en) | The positive negative output low voltage difference with short-circuit protection function adjusts circuit | |
| CN203233159U (en) | MP3 player with electrostatic protection and surge protection | |
| CN103439905B (en) | IO input port expansion circuit | |
| CN204495864U (en) | Resistance to voltage protection circuit | |
| CN204992542U (en) | Dead type overvoltage crowbar of lock | |
| CN103746676A (en) | Comparison circuit of simple structure | |
| CN105223433A (en) | Metal oxide arrester on-line monitoring system | |
| CN103475219A (en) | Wide power source low dropout voltage regulator circuit | |
| CN104330748A (en) | High-voltage switching power supply output ripple test circuit and test method thereof | |
| CN103532371A (en) | Negative voltage generating circuit | |
| CN203590179U (en) | Oscillator circuit | |
| CN105515360A (en) | Short-circuit protection circuit based on double operational amplifiers | |
| CN205067545U (en) | Low temperature floats reference circuit | |
| CN106899281A (en) | A kind of comparison circuit of simple structure | |
| CN104639128A (en) | Anti-interference timing switch circuit | |
| CN205490120U (en) | Put short -circuit protection circuit based on two fortune | |
| CN203661017U (en) | Comparator realization circuit | |
| CN201928247U (en) | Triangular wave signal generator | |
| CN202940792U (en) | Frequency generator circuit unchanged with voltage change | |
| CN103575962B (en) | Passive peak value follower circuit | |
| CN202159281U (en) | Linear voltage-adjusting circuit | |
| CN203490275U (en) | Double-subtraction alternating current sampling circuit of integrated power supply | |
| CN203456869U (en) | Single-pole PFC lightning protection circuit | |
| CN203572869U (en) | Passive peak value follower circuit | |
| CN204559966U (en) | A kind of single supply low noise LED power drive unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140423 |